JPH0749657A - Mounting structure and mounting method of display device - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] A mounting structure of a display device, which can reduce the number of parts, realize simplification of structure and weight, and improve reliability. And a method of mounting a display device capable of reducing the manufacturing man-hours. The display device 21 includes a plurality of flexible wiring boards 30 which are arranged along an arrangement direction along a peripheral edge portion 27 and each of which mounts an integrated circuit 29 for displaying and driving a display panel 28. A plurality of connection terminals 44, 45 arranged on the plurality of flexible wiring boards 30;
46 and 47 are arranged on the flexible wiring board 30 along a direction intersecting with the arrangement direction. Further, bypass wirings 56 are provided on the plurality of flexible wiring boards 30. The bypass wiring 56 electrically connects at least a part of the plurality of connection terminals 44, 45, 46, 47 to each other in the vicinity of both ends thereof, and is electrically connected to the integrated circuit 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure and mounting method for a display device, and more specifically, it displays an image on a liquid crystal display device, an EL (electro luminescence) display device and a plasma display device. The present invention relates to a mounting structure and a mounting method for mounting a flexible substrate, various circuit components, or the like on the display panel in a display device in which electrode terminals are arranged on the periphery of a display panel including a display section.

[0002]

2. Description of the Related Art Among various display devices, a liquid crystal display device will be described below. FIG. 26 is a perspective view of a conventional liquid crystal display device 1, and FIG. 27 is a sectional plane line X2 of FIG.
It is sectional drawing seen from 7-X27.

As shown in FIG. 26 and FIG. 27, a liquid crystal display device 1 is constituted by enclosing a liquid crystal between a pair of glass substrates 2 and 3, and has a display panel 6 having a display section 6 for displaying an image. 7 and a wiring board or a flexible wiring board, which will be described later, connected to the display panel 7.

The display panel 7 has a peripheral portion 4 of the glass substrate 2.
Is provided with a large number of electrode terminals 5. The electrode terminal 5 is made of a material such as ITO, Ta, Ti, Mo, Cu, Al or Au, and has a single layer or multiple layers, and a film thickness of 50 nm to several tens.
0 nm, line width 10 μm to several 100 μm, resistivity 0.1Ω
/ □ to several hundreds Ω / □. A driving integrated circuit element (IC, hereinafter integrated circuit) for driving the display panel 7 to display on the electrode terminals 5 in the peripheral portion 4 of the display panel 7.
Output electrode terminals 14 of a plurality of flexible wiring boards 9 each having 8 mounted thereon are connected through an anisotropic conductive film 15. The output electrode terminal 14 is made of a material such as Sn or Cu plated with Au, and has a film thickness of 10 to 60 μm and a line width of 0.1.
It is formed by mm to 2 mm. Each flexible wiring board 9
Are mounted on the common wiring board 10. Input electrode terminal 16 for inputting a control signal or the like to the integrated circuit 8
Is arranged on each side of the flexible wiring boards 9 different from the side on which the output electrode terminals 14 are arranged, and solder 17 is used for the electrode terminals 18 formed on the bus lines 13 of the common wiring board 10. Are connected to each other.

The common wiring board 10 has a substantially L shape along the peripheral portion 4 of the display panel 7 and receives a control or display signal from the outside from the control board 12. The control board 12 supplies a signal to the common wiring board 10 through the connector 11 and is formed in a substantially rectangular shape.

FIG. 28 is a process drawing showing the manufacturing process of the display device 1 of the prior art. In step a1, the solder 17 is supplied to each electrode terminal 18 of the common wiring board 10 by printing or plating. In step a2, the anisotropic conductive film 15 is formed on the electrode terminals 4 in the peripheral portion 4 of the display panel 7.
To form. In step a3, each electrode terminal 4 of the display panel 7 and each output electrode terminal 1 of each flexible wiring board 9
Mutual positioning with 4 is performed.

In step a4, the display panel 7 and each flexible wiring board 9 are connected to each other by thermocompression bonding. In step a5, each flexible wiring board 9 and the common wiring board 10 are positioned. In step a6, the flexible wiring boards 9 and the common wiring board 10 are connected to each other by heating. The mounting technology for this type of connection is the monthly Semiconductor Worl
d Extra number "'93 latest liquid crystal process technology" (Publisher: Press Journal, Inc., Volume 144, Issued October 2, 1992, pages 249 to 252, "Driver IC mounting technology"). ing.

During operation of the liquid crystal display device 1, the common wiring board 1 is connected from the control board 12 via the connector 11.
A control signal is supplied to the 0 bus line 13. A control signal is input to the driving integrated circuit 8 of each flexible wiring board 9 via the bus line 13 and the input electrode terminal 16 of each flexible wiring board 9. The signal output from the integrated circuit 8 is applied to the display electrodes (not shown) formed on the facing surfaces of the glass substrates 2 and 3 via the output electrode terminals 14 and the electrode terminals 5. This allows
The liquid crystal display device 1 is driven for display.

[0009]

Recent liquid crystal display device 1
In the development of (1), there is a strong demand for reducing the size and weight of the liquid crystal display device 1 in which the flexible wiring board 9 and the like are mounted in a mounted state. However, in the above-described conventional mounting structure of the liquid crystal display device 1, the common wiring substrate 10 and the control substrate 12 are arranged on the side of the display panel 7 so as to be separated from the display panel 7.
There is a problem that the size of the liquid crystal display device 1 becomes large. Further, since the liquid crystal display device 1 is provided with two types of relatively large-sized components, the common wiring substrate 10 and the control substrate 12, the weight of the liquid crystal display device 1 is increased and the weight reduction is prevented. Also, the number of parts increases, which increases the material cost. Further, when the number of parts is large and the size is large, there is a problem that the liquid crystal display device 1 becomes less reliable because it is easily affected by external force.

As shown in steps a4 and a6, the flexible wiring board 9 and the display panel 7 are connected to each other, and the flexible wiring board 9 and the common wiring board 1 are connected.
It is necessary to make a connection with 0 individually. Therefore, in the above-mentioned conventional technique, since the number of connecting steps is large, there is a problem that the number of steps is increased and the cost is increased. Further, if the number of connection steps is large, the probability of occurrence of defects increases, and in this respect as well, there arises a problem that the reliability of the liquid crystal display device 1 decreases.

The present invention has been made in order to solve the above problems, and (1) it is possible to reduce the number of parts, and (2) thereby to realize simplification of structure and weight saving. (3) It is a first object of the present invention to provide a mounting structure of a display device capable of improving reliability, and (4) a method of mounting a display device capable of reducing the number of manufacturing steps. It is a second object of the present invention to provide

[0012]

According to the mounting structure of a display device of the present invention, a display panel having a peripheral edge portion, and a display panel disposed at the peripheral edge portion of the display panel along the arrangement direction along the peripheral edge portion, are provided. A mounting structure of a display device, comprising: a plurality of wiring boards, each mounting a circuit element for driving a panel, wherein the plurality of wiring boards include an insulating substrate and the arrangement direction in each wiring board. In the vicinity of both ends, a plurality of connection terminals respectively arranged on the insulating substrate along a direction intersecting the arrangement direction and at least a part of the plurality of connection terminals near the both ends are mutually connected between the both ends. To the
Each of the display panels includes a bypass wiring electrically connected to the driving circuit element, and the display panel is connected to each of the connection terminals of a plurality of wiring boards adjacent to each other on the peripheral portion. And a plurality of common lines formed between the connection terminals of the plurality of wiring boards adjacent to each other, wherein the connection terminals of the plurality of wiring boards are connected to each other on the display panel. It has a configuration in which it is connected to a plurality of common lines and other connection terminals by using the same connecting material, and thereby the above-mentioned object is achieved.

The display device mounting structure according to the present invention includes a display panel having a peripheral edge portion, and a driving circuit element for the display panel, which is arranged in the peripheral edge portion of the display panel along the arrangement direction along the peripheral edge portion. A mounting structure of a display device, comprising: a plurality of wiring boards each mounting a plurality of wiring boards, wherein the plurality of wiring boards include an insulating board and the array in the vicinity of both ends in the array direction in each wiring board. A plurality of connection terminals respectively arranged on the insulating substrate along a direction intersecting the direction and at least a part of the plurality of connection terminals near the both ends are electrically connected to each other between the both ends, And a bypass wiring electrically connected to the display circuit element, the display panel being connected to a part of the connection terminals of each of the plurality of wiring boards on the peripheral portion in common. Array of wiring boards A plurality of common lines formed over a range including an enclosure are provided, and the connection terminals of each of the plurality of wiring boards use the same connection material for the common lines and other connection terminals on the display panel. It has a connected configuration, which achieves the above objectives.

According to the mounting structure of the cover device of the present invention, the display panel having the peripheral edge portion and the peripheral edge portion of the display panel are
A mounting structure of a display device, comprising: a plurality of wiring boards which are arranged along an arrangement direction along the peripheral portion and which respectively mount driving circuit elements of a display panel, wherein the plurality of wiring boards are , An insulating substrate, and in the vicinity of both ends in the arrangement direction in each wiring board, at least a part of a plurality of connection terminals near the both ends are electrically connected to each other between the both ends, and the driving circuit element and The display panel is connected to the connection terminals of each of a plurality of wiring boards that are adjacent to each other on the peripheral portion, and the bypass wirings are electrically connected to each other. A plurality of first common lines formed between the connection terminals of the plurality of wiring boards, and a part of the connection terminals of the plurality of wiring boards on the peripheral portion. Connected to multiple wiring boards A plurality of second common lines formed over the range of service, and the connection terminals of each of the plurality of wiring boards have the plurality of first common lines, second common lines and others on the display panel. The connection terminals are connected to each other by using the same connecting material, and thereby the above-mentioned object is achieved.

In the present invention, the bypass wiring may include a first bypass wiring formed on the insulating substrate and directly connecting the connection terminals near the both ends to each other. In the present invention, the bypass wiring includes a second bypass wiring formed on the insulating substrate in a range extending from the vicinity of one of the ends to the driving circuit element, and the other of the both ends. A third bypass wiring formed on the insulating substrate in a range extending from the vicinity of the end portion of the driving circuit element to the driving circuit element, and both ends of the third bypass wiring formed in the driving circuit element and serving as the second bypass wiring and the third bypass wiring. In some cases, it includes the bypass wiring in the element connected to each element.

In the present invention, the bypass wiring may be provided on both surfaces of the insulating board in each wiring board.

In the present invention, the first bypass wiring is
It may be provided on the insulating substrate at a position passing between the insulating substrate and the driving circuit element.

In the present invention, the connecting material may be an anisotropic conductive film.

According to the present invention, the display panel has a pair of light-transmissive display substrates each having a display electrode provided on the surfaces facing each other, and at least one of the pair of display substrates is provided. In a range where one display substrate overlaps with the opposing display substrate, the common line may be provided in the remaining overlapping region other than the display electrode installation region and the peripheral portion.

According to the method of mounting a display device of the present invention, a plurality of wiring boards each having a driving circuit element of the display panel are aligned with the peripheral portion of a display panel having a peripheral portion, and a connecting material is used. Through the signal input terminal of the wiring board,
The method includes the steps of connecting the signal input terminal for bypass and the signal output terminal to the display panel to the display panel and the wiring board all at once, thereby achieving the above object.

[0021]

According to the present invention, a display device is provided with a display panel having a peripheral portion, and at the peripheral portion of the display panel, arranged along the arrangement direction along the peripheral portion, and driving circuit elements for the display panel. And a plurality of wiring boards respectively mounted with. The plurality of connection terminals arranged on the plurality of wiring boards are respectively arranged on the insulating board along the direction intersecting the arrangement direction in the vicinity of both ends of the arrangement direction in each wiring board. . In addition, bypass wiring is provided on each of the plurality of wiring boards. The bypass wiring is electrically connected to the drive circuit element by electrically connecting at least a part of the plurality of connection terminals near the both ends of each wiring board between the both ends.

With such a structure of each wiring board, the wiring resistance for routing the common line becomes lower than that in the case where the connection terminals are arranged in parallel to the arrangement direction, and the display quality of the display device is stabilized. .

The display panel is connected to the connection terminals of a plurality of wiring boards that are adjacent to each other on the peripheral portion, and the connection terminals of a plurality of wiring boards that are adjacent to each other. And a plurality of common lines formed over the space. The connection terminals of each of the plurality of wiring boards are connected to the plurality of common lines and other connection terminals on the display panel using the same connection material.

With such a structure of the display panel, the area occupied by the display device can be significantly reduced. The reason is that it is possible to reduce the number of the separate wiring boards as compared with the case where the common line is provided on the separate wiring board by using the wiring board different from the display panel and the wiring board.

In this way, the present invention can achieve the following actions.

(1) The display device is made smaller and thinner, and (2)
The display device is reduced in weight, and (3) the miniaturization of the configuration makes it less likely to be affected by external force, thus improving the reliability of the display device.

According to another invention, a display device mounting structure includes a display panel having a peripheral portion and a plurality of wiring boards. The plurality of wiring boards are arranged in the peripheral portion of the display panel along the arrangement direction along the peripheral portion, and each mounts a drive circuit element for the display panel. The plurality of connection terminals provided on the plurality of wiring boards are located near both ends of the wiring board in the arrangement direction.
They are arranged on the insulating substrate along a direction intersecting with the arrangement direction. In addition, the plurality of wiring boards respectively connect at least a part of the plurality of connection terminals near the both ends with each other in the vicinity of the both ends and bypass wiring electrically connected to the driving circuit element. I have it.

The common line formed on the display panel is commonly connected to a part of the connection terminals of each of the plurality of wiring boards on the peripheral portion of the display panel. Further, the common line is formed on the display panel over a range including an array range of the plurality of wiring boards. The connection terminals of each of the plurality of wiring boards are connected to the common line and other connection terminals on the display panel using the same connection material.

Also in such an invention, the above (1) to (3)
It is possible to achieve the same effect as that shown in FIG.

The display device mounting method of the present invention is performed as follows. A plurality of wiring boards on which the driving circuit elements of the display panel are mounted are respectively aligned with a common line on the peripheral portion of the display panel. The connection terminals of the plurality of wiring boards are connected to the common line and other connection terminals in the peripheral portion of the display panel via a connecting material. When the common line is provided on a wiring board different from the display panel or the plurality of wiring boards, between the plurality of wiring boards and the display panel and between the plurality of wiring boards and the different wiring boards Each connection process between and is required. In the mounting method of the present invention, the step of connecting the plurality of wiring boards and the separate wiring board is unnecessary. As a result, the number of man-hours for mounting the display device is significantly reduced, and the mounting process of the display device is simplified.

[0031]

EXAMPLES The mounting structure and mounting method of the display device of the present invention will be described in detail below with reference to examples.

FIG. 1 is a perspective view of a liquid crystal display device 21 according to an embodiment of the present invention, FIG. 2 is a plan view of the flexible wiring board 30 of the liquid crystal display device 21, and FIG. 3 is a liquid crystal display device. 21 is an exploded perspective view around the flexible wiring board of FIG. 21, FIG. 4 is a cross-sectional view taken along the section line X4-X4 of FIG. 2, and FIG. 5 is viewed along the section line X5-X5 of FIG. FIG. In the following description, the liquid crystal display device 2
1 is exemplified. The embodiment of the present invention is based on the liquid crystal display device 21.
However, the present invention is not limited to the EL display device or the plasma display device, but is applied to a wide variety of matrix-driven display devices.

In this embodiment, a liquid crystal display device (hereinafter,
The display device 21 injects a liquid crystal 82 between a pair of rectangular glass substrates 22 and 23 having transparent electrodes (not shown) formed on the surfaces facing each other, and seals the periphery with a sealing material. It includes a display panel 28 configured to be stationary. Each glass substrate 22 included in the display panel 28,
The transparent electrode arrangement region in 23 is defined as the display unit 26 in which an image is displayed. Ten flexible wiring boards as an example in which the driving integrated circuit 29 for driving the liquid crystal display device 21 is mounted on the peripheral edge portion 27 of the one glass substrate 22 other than the overlapping area with the other glass substrate 23. 30 is attached. The outer peripheral edge portion 27 is an L-shaped area along two sides of the glass substrate 22 that are adjacent to each other. Further, the flexible wiring board 30 has an insulating film 43 made of an electrically insulating material such as a polyimide resin or a polyester resin as an example. Various terminals and wirings, which will be described later, are formed on the insulating film 43.

A common line 31 for supplying a signal or power commonly input to each flexible wiring board 30 is
In the peripheral portion 27, the flexible wiring boards 30 are continuously formed in the peripheral portion 27 in the arrangement range. A signal or drive power commonly supplied to each flexible wiring board 30 is supplied to the common line 31 on the peripheral edge portion 27 from the control board 32 to the connector 33.
Is supplied via. The display device 21 is configured to include the display panel 28, the plurality of flexible wiring boards 30, and the control board 32.

As shown in FIGS. 2 and 3, an insulating film 34 is formed on the glass substrate 22 of the display panel 28 by depositing Ta ₂ O ₅ or the like as an example. When the source electrode or the gate electrode inside the display unit 26 is formed on the insulating film 34, the plurality of common lines 31 are made of ITO, Ta, Ti, Mo, C, and have a length extending over substantially the entire length of the peripheral portion 27.
u, Au, Al, Ag paste, etc., single layer or multilayer, film thickness 50 nm or more, line width several μm to several m
m, resistance 0.1Ω / □ to several hundreds Ω / □.
On the glass substrate 22 on which the common line 31 is formed,
The insulating film 35 is formed of a material such as SiN, SiO ₂ , Ta ₂ O ₅ or polyimide so as to have a plurality of through holes 36.

Further, in the plurality of pixels arranged in a matrix in the display section 26 on the insulating film 35, as an example, a plurality of signal wirings 37 connected to the pixel groups in each column and a peripheral edge are provided. On the portion 27, a relay common line 38 for signals and a relay common line 39 for power supply having a length extending in the vicinity of mutually facing ends of the flexible wiring boards 30 adjacent to each other are formed. ing. The relay common lines 38, 39 are made of ITO, Ta, Ti, Mo, C
u, Au, Al, Ag paste, etc., single layer or multilayer, film thickness 50 nm or more, line width several μm to several m
m, resistance 0.1Ω / □ to several hundreds Ω / □.
As shown in FIGS. 2 and 3, the relay common lines 38 and 39 are along a direction perpendicular to the arrangement direction (lateral direction in FIGS. 2 and 3) of the plurality of flexible wiring boards 30 in the peripheral edge portion 27. Are arranged. Rectangular connection parts 40 are formed at equal pitches at each end of each signal line 37. Each connecting portion 40 is made of ITO, Ta, Ti, Mo,
Cu, Au, Al, Ag paste and other materials in a single layer,
Alternatively, the film thickness is 50 nm or more and the line width is several μm to 10
It is formed with 0 μm and a resistance of 0.1 Ω / □ to several 100 Ω / □. The plurality of connecting portions 40 are arranged along the arrangement direction.

On the peripheral edge 27 of the glass substrate 22,
A plurality of lead-in lines 42 are formed, one end of which is connected to the common line 31 through the through hole 36 of the insulating film 35 and the other end of which extends toward the end of the peripheral edge 27. The ends of the lead-in lines 42 are respectively connected to the rectangular connecting portions 41 arranged on the peripheral edge portion 27 along the arrangement direction. Common line 3 like this
An insulating film 63 is formed to cover 1 and the lead-in line 42.

On the other hand, each flexible wiring board 30 is formed in a substantially rectangular shape, and is usually a TAB (Tape Automat).
ed Bonding) substrate. Each flexible wiring board 30 is a glass substrate 22 of a flexible base material 43.
The relay common line 3 on the input side on the back surface facing the
Input terminals 44 and 45 connected to 8 and 39, respectively
Is equipped with. As shown in FIGS. 2 and 3, these input terminals 44 and 45 are arranged at one end of each flexible wiring board 30 along the arrangement direction along the direction perpendicular to the arrangement direction. .

A plurality of electrode terminals respectively connected to the plurality of connecting portions 40 at the end portion adjacent to the one end portion of each flexible wiring board 30 and facing the glass substrate 22. 48 are arranged along the arrangement direction. Further, the plurality of electrode terminals 49 respectively connected to the connecting portions 41 are arranged in the arrangement direction. In each flexible wiring board 30, at the end opposite to the end where the input terminals 44 and 45 are installed along the arrangement direction, in the same arrangement as the input terminals 44 and 45, Output terminals 46 and 47, which output signals of the same type as the signals input to the input terminals 44 and 45, are arranged along a direction perpendicular to the arrangement direction. Input terminal 4
4, 45 and the output terminals 46, 47 are made of a material such as Sn or Au plated Cu or aluminum and have a film thickness of 10 to 6
The line width is about 0 μm and the line width is several μm to several mm.

On the other hand, a storage hole 50 for storing the integrated circuit 29 is formed at a position apart from each end of each flexible wiring board 30, and the integrated circuit 29 in each storage hole 50 is formed.
Is firmly covered with a protective resin layer 51 such as an epoxy resin. The integrated circuit 29 includes a plurality of electrode bumps 52.
Is equipped with. In the flexible wiring board 30, the input terminals 44 and 45, the electrode terminals 48 and 49 and the output terminals 46 and 47, and the corresponding electrode bumps 52 of the integrated circuit 29.
And a plurality of connection wirings 53 and 54 for respectively connecting
And 55 are formed. Alignment marks 100 are formed at positions corresponding to some of the electrode terminals 49.

On each flexible wiring board 30, a connection wiring 56 for directly connecting the input terminal 45 and the output terminal 47 is formed, and a branch wiring for connecting the connection wiring 56 and the corresponding electrode bump 52 of the integrated circuit 29. 57 is formed. Further, the signal input from the input terminal 44 to the flexible wiring board 30 includes a signal to be transmitted to another adjacent flexible wiring board 30. In order to perform such transmission, a plurality of internal wirings that directly connect the input connection wiring 53 and the output connection wiring 101 corresponding to the signal to be transmitted inside the integrated circuit 29. 58 is formed in integrated circuit 29. In each flexible substrate 30, the connection wiring 56 and a part of the connection wiring 53 are connected to a chip capacitor 60 for signal adjustment.
As a result, the display quality difference between the integrated circuits 29 of each flexible substrate 30 is reduced.

The anisotropic conductive film 59 is used for the connection between the display panel 28 and each flexible substrate 30.

FIG. 6 shows the display device 2 according to an embodiment of the present invention.
2 is a flowchart showing the manufacturing process of No. 1 and FIG. 7 is a sectional view showing the manufacturing process.

The manufacturing process of this embodiment will be described below with reference to the drawings. When mounting each flexible substrate 30 on the display panel 28, the anisotropic conductive film 59 is formed at a connection portion of a plurality of predetermined flexible substrates 30 in the peripheral edge portion 27 of the display panel 28 in step b1 in FIG. Attached or applied. In step b2, the flexible wiring boards 30 are respectively aligned with a plurality of predetermined positions on the peripheral edge portion 27 of the display panel 28. Specifically, the peripheral portion 27 of the display panel 28 and the plurality of flexible wiring boards 30 are opposed to each other, and the connection portions 40 and 41, the electrode terminals 48 and 49, and the arrangement direction of one flexible wiring board 30. Relay common lines 38 and 39 located at both ends and input and output terminals 4
4, 45, 46, and 47 are aligned on a one-to-one basis for each flexible substrate 30.

Then, in step b3, the display panel 28 on which the aligned flexible wiring boards 30 are mounted has a shape for pressing the connection area of each flexible wiring board 30 to the display panel 28. It heats using the thermocompression bonding head 61 which has the one or several pressing part 62 shown in FIG. As a result of this heating, as shown in FIG. 7, the connecting portions 40 and 41 and the electrode terminals 48 and 49 are combined into one flexible wiring board 3 again.
Relay common lines 38 located at both ends in the arrangement direction of 0,
39 and the input and output terminals 44, 45, 46, 47,
Thermocompression bonding is performed through the anisotropic conductive film 59. This completes the process of mounting the plurality of flexible wiring boards 30 on the display panel 28.

In this way, the opposing electrodes of the connecting portions 40, 41, the terminals 44, 45, 46, 47, 48, 49 and the relay common lines 38, 39 are electrically connected together. You can

As described above, the structure of the display device 21, specifically, the display panel 28 and each flexible wiring board 3
The connection terminals 44 to 47 for the 0 and the connection terminals arranged in parallel with each arrangement direction of each flexible substrate 30 in the display panel 28 and the connection terminals arranged in the direction perpendicular to the arrangement direction. By including, all the connection terminals 44 to 47 may be able to reduce the size of each flexible wiring board 30 along the arrangement direction, as compared with the case where they are arranged in parallel to the arrangement direction,
It is possible to reduce the resistance of the lead wire of the common line and maintain good display quality.

Further, with the structure of the display panel 28 as described above, the area occupied by the display device 21 can be significantly reduced. This is because a separate wiring board is used for the display panel 28 and the flexible wiring board 30,
26. Providing a common line 31 on the separate wiring board
This is because it is possible to reduce the number of separate wiring boards as compared with the related art shown in FIG.

In this way, in the present embodiment, the display device 21 is made smaller, thinner, and lighter, and further, the miniaturization of the structure makes it less likely to be affected by external force, thereby improving the reliability of the display device 21. Can be improved.

The region where the anisotropic conductive film 59 is provided is
Each terminal 44, 45, 46, 47, 48, 49 is individually covered, and each terminal 44, 45, 46, 47, 48,
The area may be about 49, but it may be provided all over the outside of the insulating film 63. Further, instead of the anisotropic conductive film 59, solder, photocurable resin, or other connecting material may be used.

In this way, as shown in FIG. 1, one side of the liquid crystal display device 21 has wiring patterns that are the same as each other, and as an example, a plurality of flexible wiring boards for driving the scanning lines of the liquid crystal display device 21. 30 is connected to the display panel 28. Further, the other side of the liquid crystal display device 21 has a wiring pattern different from that of the flexible wiring board 30, and as an example, the flexible wiring board 30 for driving the data lines of the liquid crystal display device 21 is connected to the display panel 28. To be done. Further, at the corner 64 of the peripheral edge 27 of the glass substrate 22, the common line 31 and the relay lines 38, 3
A control board 32 for supplying a signal for driving the liquid crystal display device 21 is connected to 9 via a connector 33.

During operation of the liquid crystal display device 21, the display device 2 is passed from the control board 32 through the connector 33.
The common line 31 and the relay line 3 of the peripheral edge portion 27
A driving signal is supplied to 8 and 39. This signal is transmitted from the connection portion 41 and the terminals 44 and 45 shown in FIGS.
The integrated circuit 29 is driven through the wirings 53 and 90 of the flexible wiring board 30 to output an output signal to the wiring 54 and the terminal 48.
Through a pixel electrode (not shown) of the liquid crystal display device 21. As a result, the liquid crystal display device 21 is driven.

Further, the drive signal is branched at the relay line 38, and the input terminal 44 of the flexible wiring board 30, the connection wiring 53, the lower wiring or internal wiring 58 of the integrated circuit 29, the connection wiring 101, the output. It is supplied to the input terminal 44 of the flexible wiring board 30 adjacent to the flexible wiring board 30 via the terminal 46 and the relay line 38. Then, it is input from the input terminal 44 to the driving integrated circuit 29 via the connection wiring 53 of the adjacent flexible wiring board 30. Integrated circuit 2 for this drive
The signal output by 9 is supplied to the inside of the display unit 26 of the display panel 28 via the output terminal 48 of the flexible wiring board 30 and the connecting portion 40 of the peripheral portion 27.

In this manner, the driving signal is supplied to the connecting portions 40 respectively corresponding to the plurality of flexible wiring boards 30 mounted on one side of the peripheral edge portion 27 of the liquid crystal display device 21. The drive signal is similarly supplied to the connecting portion 40 corresponding to the flexible wiring board 30 (see FIG. 1) mounted on the other side of the liquid crystal display device.

In this liquid crystal display device 21, the common wiring board 10 arranged laterally of the conventional liquid crystal display device 1 is used.
(See FIGS. 26 and 27) is omitted, so that the size of the liquid crystal display device 21 can be reduced, the liquid crystal display device 21 can be made thinner and lighter, and the cost can be reduced. You can

Moreover, the connection between the relay lines 38 and 39 of the peripheral portion 27 of the liquid crystal display device 21 and the input terminals 44 and 45 of the flexible wiring board 30, the flexible wiring board 30.
Connection between the output terminals 46 and 47 and the relay lines 38 and 39, and the connection portions 40 and 41 and the flexible wiring board 30.
The connection with the electrode terminals 48 and 49 is collectively performed via the anisotropic conductive film 59. Therefore, the number of connection steps in manufacturing the liquid crystal display device 21 can be reduced, so that the incidence of defective products in the connection process is reduced, and the manufacturing yield in the mounting step is also improved. Further, the cost can be reduced in terms of the manufacturing process.

Further, in this embodiment, the common wiring board in the prior art is not adopted, and the connecting step between the flexible wiring board 30 and the common wiring board is not performed.
Therefore, the number of manufacturing steps can be reduced and the cost can be reduced as compared with the conventional case. Moreover, since the number of parts is reduced, the reliability of the liquid crystal display device 21 can be significantly improved.

In this embodiment, the signals sequentially transmitted through the flexible wiring boards 30 are the relay common line 3
8 and 39 and the connection wiring 56 in each flexible wiring board 30. Therefore, the common line 3 formed by using the thin film technique on the peripheral portion 27 of the display panel 28.
It is possible to reduce the wiring resistance associated with the signal transmission, as compared with the case where the signal is transmitted using only one. Further, the line widths of the input terminals 44, 45, the output terminals 46, 47 and the electrode terminals 48, 49 of the flexible wiring board 30 can be increased, and the relay common lines 38, 39 of the display panel 28,
The line width of the connecting portions 40 and 41 can be increased. As a result, each flexible wiring board 30 is attached to the display panel 28.
It is possible to reduce the connection resistance when mounting.

Further, the flexible wiring board 3 of this embodiment
At 0, a resin having electrical insulation is applied to the surface on which the input terminals 44, 45 are formed to form an insulating film, and a plurality of input terminals 44, 45, terminals 48, 49,
The reliability of the electrical insulation between the connection wirings 53, 54, 55, 101, 56 and the output terminals 46, 47 may be increased.

FIG. 8 is a plan view of a flexible wiring board 30a which is a modified example of the flexible wiring board 30 in the embodiment used in the liquid crystal display device 21 of the present invention. In the flexible wiring board 30a of this modification, the corner portions of both ends of the side of the insulating film 43 of the flexible wiring board 30 of the embodiment facing the display panel 28 are cut out to form the cutout portions 66. There is.

Among the plurality of input terminals 44 formed on the flexible wiring board 30, the signal input to the input terminal 44 is, for example, the flexible wiring board 30.
If the signal of the first type is to be input to the integrated circuit 29 mounted on, the signal of the first type is input to the input terminal 4
It is input to the integrated circuit 29 from 4a through the connection wiring 53. This signal is processed inside the integrated circuit 29 to output another waveform signal, and passes through the connection wiring 55 to the terminal 46.
A signal is sent to the adjacent flexible wiring board 30 through a. If the input signal is, for example, the second type of signal that is to be input to the integrated circuit 29 and is to be transmitted to another adjacent flexible wiring substrate 30 without changing the signal waveform, this The input terminal 44b to which two types of signals are input is connected to the integrated circuit 29 by the connection wiring 53, and the input terminal 44b is also connected.
Is directly connected to the output terminal 46b corresponding to the connection wiring 56.

For example, the input signal should be transmitted to another flexible wiring board 30 adjacent thereto without being input to the integrated circuit 29 or to another electrode (for example, a common electrode) on the panel. If it is a signal of three types, the input terminal 44c to which the signal of the third type is input
Are directly connected to the output terminal 46c corresponding to the input terminal 44c by the connection wiring 56. The input terminal 45 is connected to the output terminal 47 corresponding to the input terminal 45 by the connection wiring 56, and a part of the connection wiring 56 is connected to the integrated circuit 29 by the branch wiring 57.

Such a flexible wiring board 30a
Is mounted on the display panel 28 by a mounting process similar to the mounting process of the above embodiment. At this time, a gap is formed by the cutout portion 66 between the plurality of adjacent flexible wiring boards 30a mounted on the display panel 28. As shown in FIG. 8, a part of the input terminals 44b and 44c, a part of the connection wiring 56, and a part of the output terminals 46b and 46c are exposed to the outside from this gap. Therefore, when the flexible wiring board 30a is used, the panel side is covered with an insulating film made of a material such as SiN or polyimide, taking the gap as an example.

FIG. 9 is a perspective view of a liquid crystal display device 21a according to a second embodiment of the present invention, and FIG. 10 is a sectional view of this embodiment. The liquid crystal display device 21a of the present embodiment has the first
Similar to the liquid crystal display device 21 of the embodiment described above, corresponding parts are designated by the same reference numerals. In this second embodiment,
The plurality of flexible wiring boards 30 are attached to the display panel 28.
After connecting to the peripheral portion 27 of each flexible wiring board 3
At 0, a portion protruding outward from the peripheral edge portion 27 of the display panel 28 is bent by winding the peripheral edge portion 27 of the display panel 28 as shown in FIGS. 9 and 10. By this bending process, the display panel 2 of the liquid crystal display device 21
8 has a structure in which each flexible wiring board 30 is sandwiched at a peripheral edge portion 27 thereof.

As a result, each flexible wiring board 30
The size of the liquid crystal display device 21a can be further reduced by the amount of the bending.

In this embodiment, as shown in FIG. 10, a flexible wiring board is bent as described above using a clip 67 made of a shape memory alloy or a shape memory resin having a U-shaped cross section. The display panel 28 is sandwiched by the peripheral portion 27 from the outer peripheral side of the relay line 30, and the relay lines 38 and 39 and the connection portions 40 and 41, and the input terminals 44 and 45, the output terminals 46 and 47, and the terminals corresponding thereto. Four
8, 49 may be pressed against each other. As a result, the connection terminals of the display panel 28 and the flexible wiring board 30 are easily and firmly connected to each other. At this time, the space between the flexible wiring board 30 and the glass substrate 22, and the flexible wiring board 30 and the clip 6
The spacer 200 is mounted on the flexible wiring board 30 in order to set the distance between the spacers 7 and 7 to a predetermined distance.

Therefore, in this embodiment, the same effects as those described in the above embodiments can be achieved, and the display panel 28 and the plurality of flexible wiring boards 30 can be achieved.
The reliability of connection with can be further improved.

FIG. 11 is a plan view of a liquid crystal display device 21b according to a third embodiment of the present invention, FIG. 12 is a sectional view taken along section line X12-X12 of FIG. 11, and FIG. 1
It is sectional drawing seen from the cutting plane line X13-X13 of FIG. This embodiment is similar to the first embodiment, and the same reference numerals are given to corresponding parts.

The first remarkable point of this embodiment is that the common line 31 is not formed on the display panel 28 of the first embodiment. Therefore, the signals to be mutually transmitted between the plurality of flexible wiring boards 30 mounted on the display panel 28 include the plurality of relay lines 38 and 39 formed on the display panel 28 and each flexible wiring board 30. Is transmitted by the plurality of input terminals 44 and 45 and the plurality of output terminals 46 and 47 in the above.

Thus, in the first embodiment,
It is possible to prevent a wiring state in which the common line 31 and the signal wiring 37 extending inside the display panel 28 intersect. Therefore, on the display panel 28, it is possible to omit the structure in which the common line 31 and the signal line 37 are partially stacked with the insulating film 34 interposed therebetween, and a step due to the film thickness of the common line 31 can be omitted. Depending on the situation, the signal wiring 37 may cause connection failure or disconnection, or
It is possible to prevent a short circuit from occurring between the common line 31 and the signal wiring 37, improve the manufacturing yield of the liquid crystal display device 21b, and further, to improve the liquid crystal display device 21b.
The reliability of can be significantly improved. Further, in the present embodiment, the step of forming the common line 31 can be omitted, so that the manufacturing process of the liquid crystal display device 21b can be simplified.

The second remarkable point of this embodiment is that, in each flexible wiring board 30, all signals transmitted from the input terminals 44, 45 to the output terminals 46, 47 are inside the integrated circuit 29. Is to pass through. That is, all the input terminals 4 of each flexible wiring board 30
4, 45 are respectively connected to the input terminals 68 of the integrated circuit 29 by a plurality of connection wirings 53a. In each flexible wiring board 30, the output terminal 68 of the integrated circuit 29 mounted therein has a plurality of connection wirings 55.
It is connected to all output terminals 46 and 47 by a.

Therefore, in order to directly connect the input terminals 44, 45 and the output terminals 46, 47, a plurality of connections are formed on each flexible wiring board 30 by being routed along the second direction. Wiring can be omitted, and the configuration of each flexible wiring board 30 can be simplified.

The third remarkable point of this embodiment is that the input terminals 44 and 45 and the output terminal 4 of the first embodiment are different.
6, 47 and the electrode terminals 48, 49 are perpendicular to the first direction (left and right direction in FIGS. 2 and 11) in which the lead-in line 42 is arranged in the display panel 28 (FIG. 2 and FIG. 11). 11 is arranged along the vertical direction). Thereby, the length of each flexible wiring board 30 along the first direction is shortened as compared with the case where the electrode terminals 48 and 49 are arranged along the first direction as in the first embodiment. May be possible. Thereby, the liquid crystal display device 21b can be downsized.

The fourth point of interest of the present embodiment is that a part of the plurality of input and output terminals 68 in the integrated circuit 29 mounted on the flexible wiring board 30 is a part of the integrated circuit 29. That is, they are arranged along the second direction. As a result, the length of the integrated circuit 29 along the second direction can be shortened, and the liquid crystal display device 21b can be downsized.

FIG. 14 is a plan view of a liquid crystal display device 21c according to a fourth embodiment of the present invention, and FIG. 15 is a sectional view taken along section line X15-X15 of FIG. In this example,
Similar to the third embodiment, corresponding parts are designated by the same reference numerals.

The point of interest of this embodiment is that in the structure of the third embodiment, all the input terminals 44, 45 and all the output terminals 46, 47 of each flexible wiring board 30 are individually and directly connected. That is, a plurality of connection wirings 69 to be connected to are formed. The connection wiring 69 is formed of a material such as Sn or Cu plated with Au. One end of each connection wire 69 is connected to each input terminal 44, 45, and the other end is connected to each output terminal 46, 47. In the intermediate portion of each connection wiring 69, the integrated circuit 29 mounted on the flexible wiring board 30 is housed and the protective resin layer 5 is formed.
1, the flexible wiring board 30 is fixed to a position near the storage hole 50 formed in the base material 43. In each connection wiring 69, at a position immediately below the integrated circuit 29,
The connection portion 70 is formed to be connected to the plurality of electrode bumps 52 of the integrated circuit 29.

In this embodiment, it is possible to achieve the same effects as those described in each of the above embodiments. Further, in this embodiment, the internal wiring 58 for signal transmission of the integrated circuit 29 used in the third embodiment can be omitted, so that the internal structure of the integrated circuit 29 can be simplified. Therefore, the integrated circuit 29 can be downsized. As a result, the size of the liquid crystal display device 21c can be reduced.

FIG. 16 is a sectional view showing the structure of the first modification of this embodiment, and is a sectional view of the display panel 28 at a cutting position corresponding to FIG. As shown in FIG. 16, the integrated circuit 29 mounted on the flexible wiring board 30 is connected to the connecting wiring 6 on the flexible wiring board 30.
You may make it arrange | position on the side in which 9 is formed. Even in such a modification, the effect of this embodiment can be achieved.

FIG. 17 is a sectional view showing the structure of the second modification of this embodiment, and is a sectional view of the display panel 28 at a cutting position corresponding to FIG. As shown in FIG. 17, the accommodation hole 50 is not formed in the flexible wiring board 30a of the present modification. Therefore, in the flexible wiring board 30a of this modification, the connection wiring 69 is formed on the base material 43 of the flexible wiring board 30a. The integrated circuit 29 to be mounted is arranged on the base material 43 in the flexible wiring board 30a,
As an example, the connection wiring 69 of the flexible wiring board 30a
It is placed on the side where is formed. Even in such a modification, the effect of this embodiment can be achieved.

FIG. 18 is a plan view of a liquid crystal display device 21d according to a fifth embodiment of the present invention, and FIG. 19 is a sectional view taken along section line X19-X19 of FIG. In this example,
Similar to the third embodiment, corresponding parts are designated by the same reference numerals.

In this embodiment, the accommodation hole 50 is formed in each flexible wiring board 30, the integrated circuit 29 to be mounted is accommodated in the accommodation hole 50, and the flexible wiring is formed by the protective insulating layer 51. It is fixed to the base material 43 of the substrate 30. The input terminals 44 and 45 and the output terminals 46 and 47 are formed on one surface of the base material 43. A plurality of connection wirings 71 are formed on the base material 43 in a wiring state that avoids the storage hole 51 and that directly connects the input terminals 44 and 45 and the output terminals 46 and 47. The connection wiring 71 is made of a material such as Sn or Cu plated with Au. The chip capacitor 60 is connected to a predetermined connection wiring 71 such as the connection wiring 71 corresponding to the power supply line.

Of the connection wiring 71, the output terminals 46, 4
7 is connected to the electrode bumps 52 of the integrated circuit 29.
There is something to be connected to. In order to connect the connection wiring 71 and the integrated circuit 29, a plurality of connection lines 72 that connect the connection wiring 71 and the electrode bumps 52 of the integrated circuit 29 are formed on the base material 43. Specifically, the insulating film 73 is formed at least in the region that covers each connection line 72.
Through holes 74 are formed in the insulating film 73 at positions corresponding to the respective connection lines 72. This insulating film 7
The plurality of connection wirings 71 are formed in a range extending over the region on the base 3 and the region on the base material 43. Each connection wire 71 is electrically connected to the corresponding connection line 72 via the through hole 74 of the insulating film 73. Also in such an embodiment, the same effects as the effects described in each of the above embodiments can be achieved.

In particular, since the connection wiring 71 and the connection line 72 have a laminated structure, the flexible wiring board 3
The wiring density at 0 can be increased, and the size of the flexible wiring board 30 can be reduced.

FIG. 20 is a plan view of a liquid crystal display device 21e according to a sixth embodiment of the present invention, and FIG. 21 is a sectional view taken along section line X21-X21 of FIG. In this example,
Similar to the fifth embodiment, corresponding parts are designated by the same reference numerals.

The plurality of input terminals 44 and 45 are formed on one surface of the base material 43 of the plurality of flexible wiring boards 30 used in this embodiment. One end of the one surface is connected to the input terminals 44 and 45, extends along the second direction (vertical direction in FIG. 20), and the other end is in the first direction (in FIG. 20) of the integrated circuit 29. A plurality of connection wirings 75 located on the extension in the left-right direction and a plurality of connection lines 72 extending from the other end of each connection wiring 75 toward each electrode bump 52 of the integrated circuit 29 are formed. Also, a plurality of output terminals 46 and 47 on one surface, one end connected to the output terminals 46 and 47, extending along the second direction (vertical direction in FIG. 20), and the other end being an integrated circuit. A plurality of connection wirings 76 located on an extension along the first direction 29 (left-right direction in FIG. 20) are formed.

Through holes 78 are formed in the flexible wiring board 30 at positions corresponding to the other ends of the connection wirings 75 and 76, respectively. On the surface of the flexible wiring board 30 opposite to the surface on which the connection wiring 75 is formed, each connection wiring 7 on the signal input side is formed.
The bypass wiring 77 is individually formed between each through hole 78 corresponding to No. 5 and each through hole 78 corresponding to each connection wiring 76 on the signal output side. The bypass wiring 77 is
It is formed of a material such as Sn or Cu plated with Au. One end of each bypass wiring 77 is connected to the other end of the connection wiring 75 through a through hole 78 on the signal input side, and the other end of each bypass wiring 77 is connected through a through hole 78 on the signal output side. It is connected to the other end of the connection wiring 76.

Also in such an embodiment, the same effects as those described in the above-mentioned embodiments can be achieved.
Particularly, in the present embodiment, the connection wirings 75 and 76 are
The connection line 78 and the bypass wiring 77 are formed on both surfaces of the base material 43 so as to be overlapped with each other. Therefore, the wiring density on both surfaces of the flexible wiring board 30 can be increased, and the flexible wiring board 30 and the liquid crystal display device 21e can be downsized.

FIG. 22 is a sectional view of a liquid crystal display device 21f according to the seventh embodiment of the present invention, and FIG. 23 is a liquid crystal display device 2
It is a top view of 1f. This embodiment is similar to the first embodiment, and the same reference numerals are given to corresponding parts.

The present embodiment will be described assuming that the liquid crystal display device 21f is of the active matrix drive type. The liquid crystal display device 21f of the present embodiment includes a pair of glass substrates 2
A plurality of picture element electrodes 79, which are arranged in a matrix, are formed on the glass substrate 22, and a counter electrode 80 facing the picture element electrodes 79 is formed on the glass substrate 23. In the glass substrates 22 and 23, the pixel electrode 79
The region where the counter electrodes 80 are arranged constitutes the display unit 26. The liquid crystal layer 82 is injected between the glass substrates 22 and 23, and the periphery of the display unit 26 is sealed by the sealing material 25.

In the liquid crystal display device 21f of this embodiment,
The entire area of the glass substrate 22 outside the sealing material 25, the area covered with the sealing material 25, and the area inside the sealing material 25 and other than the display portion 26. The plurality of common lines 31 are formed over the entire length. Of these common lines 31,
The common line 31 arranged on the inner side of the sealing material 25 is a well-known alignment film or protective film (passivation film).
And the like are covered with an insulating film 83.

In this embodiment, the area where the common line 31 is formed is larger than the peripheral portion 27 of the display panel 28. As a result, the area of the peripheral portion 27 can be reduced, and the liquid crystal display device 21f can be downsized. Alternatively, it is possible to reduce the arrangement density of the common lines 31, prevent short circuits between the common lines 31 and defective insulation, and thus the liquid crystal display device 21f.
The reliability of can be improved. Furthermore, the production efficiency of the liquid crystal display device 21f can be improved at the same time.

Further, a part of the common line 31 is arranged by utilizing the inside of the sealing material 25 of the display panel 28 except the region of the counter electrode 80, and the wiring width of the common line 31 is widened to increase the resistance. By lowering, the time delay of the signal transmitted on the common line 31 is reduced. This allows
When the transmitted signal is an image signal, it is possible to prevent a situation in which noise is mixed in the image signal and the waveform of the image signal is undesirably deformed. As a result, it is possible to prevent a defect from occurring in the displayed image.

FIG. 24 is a sectional view of a liquid crystal display device 21g according to an eighth embodiment of the present invention, and FIG. 25 is a liquid crystal display device 2
It is a top view of 1g. This embodiment is similar to the seventh embodiment, and the same reference numerals are given to corresponding parts.

The liquid crystal display device 21g of this embodiment has substantially the same structure as the liquid crystal display device 21f. The feature of this embodiment is the arrangement of the common lines 31, 31a. In the liquid crystal display device 21g of the present embodiment, the area on the glass substrate 22 outside the sealing material 25, the area covered with the sealing material 25, and the inside of the sealing material 25 and the display The plurality of common lines 31, 31a are provided over the entire area formed by the vicinity of the peripheral portion of the portion 26.
Are formed. Among these common lines 31, 31a, a signal line for transmitting a signal such as a clock signal that hardly picks up noise of the counter electrode 80 is arranged as a part of the common lines 31a, and the common lines 31, 31a have a known orientation. It is covered with an insulating film 83 such as a film or a protective film (passivation film).

Of the area where the common line 31 is arranged, the area that is inward of the sealing material 25 and near the peripheral portion of the display portion 26 is defined as follows. Liquid crystal display device 2
When 1 g is used as a display device such as a computer, for example, the liquid crystal display device 21 g is attached to the computer or the like in a region of the display panel 28 which is included in the display unit 26 and near the peripheral portion of the display unit 26. The displayed image may not be visible from the outside due to the influence of the case or the like. As described above, the vicinity of the peripheral portion of the display unit 26 is included in the display unit 26 but may not substantially contribute to the display. In such a case, even if the common line 31 is formed near the peripheral portion of the display unit 26, it does not affect the display image visually recognized from the outside.

Therefore, in the above case, the common line 31 can be formed on the glass substrate 22. Also in such an embodiment, the same effect as the effect described in the seventh embodiment can be achieved.

In the present invention, the connecting material for electrically connecting the display panel 28 and the flexible wiring board 30 is not limited to the anisotropic conductive film 59. A connection technique other than the anisotropic conductive film 59 may be used, such as a connection system using solder or a photo-curable resin, or a clip pressure welding system.

[0098]

The following effects can be obtained by using the present invention.

(1) Since the circuit board forming the common line for the input signal to the integrated circuit is unnecessary, the material cost can be reduced, and the display panel can be made thin, lightweight and compact. it can. Further, since the number of connection steps is reduced, the defect occurrence rate is reduced, and the yield of the mounting step is also improved.

(2) Since the input / output electrode terminals of the flexible wiring board are collectively connected to the electrode terminals of the display panel, the number of mounting steps can be significantly reduced and the cost can be reduced. (3) In the peripheral portion of the display panel, a common line for input signal or power supply is formed between the wiring board and its adjacent wiring board, and the input signal is bypassed in the wiring board. The wiring resistance between the wiring boards connected to both ends of the peripheral edge of the display panel decreases, and the connection width between the wiring board and the electrode terminals of the display panel increases, so that the connection resistance decreases.

(4) By forming a part of the input signal common line outside the counter electrode, the signal delay time is reduced. From the above, it is possible to prevent a defect at the time of displaying an image, provide a good display quality, and provide a compact liquid crystal display device.

(5) The connecting method used in this mounting method is mainly an anisotropic conductive film. When an anisotropic conductive film is used as the connecting material in this embodiment, no new connecting material needs to be developed. Yes, know-how can be utilized, conventional manufacturing equipment can be easily converted, and capital investment can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a liquid crystal display device 21 according to an embodiment of the present invention.

2 is a plan view of the vicinity of a flexible wiring board of the liquid crystal display device 21. FIG.

FIG. 3 is an exploded perspective view of a liquid crystal display device 21 near a flexible wiring board.

FIG. 4 is a cross-sectional view taken along section line X4-X4 in FIG.

5 is a cross-sectional view taken along the section line X5-X5 in FIG.

FIG. 6 is a flowchart showing manufacturing steps of the display device 21 according to the embodiment of the present invention.

FIG. 7 is a cross-sectional view showing the manufacturing process of the present embodiment.

FIG. 8 is a plan view of a flexible wiring board 30a which is a modification of the flexible wiring board 30 in the embodiment used in the liquid crystal display device 21 of the present invention.

FIG. 9 is a perspective view of a liquid crystal display device 21a according to a second embodiment of the present invention.

FIG. 10 is a sectional view of the present embodiment.

FIG. 11 is a liquid crystal display device 21b according to a third embodiment of the present invention.
FIG.

12 is a sectional view taken along the section line X12-X12 in FIG.

13 is a cross-sectional view taken along the section line X13-X13 of FIG.

FIG. 14 is a liquid crystal display device 21c according to a fourth embodiment of the present invention.
FIG.

15 is a cross-sectional view taken along the section line X15-X15 in FIG.

FIG. 16 is a cross-sectional view showing a configuration of a first modified example of this embodiment.

FIG. 17 is a cross-sectional view showing the configuration of the second modification of the present embodiment.

FIG. 18 is a liquid crystal display device 21d according to a fifth embodiment of the present invention.
FIG.

19 is a cross-sectional view taken along the section line X19-X19 of FIG.

FIG. 20 is a liquid crystal display device 21e according to a sixth embodiment of the present invention.
FIG.

21 is a cross-sectional view taken along the section line X21-X21 in FIG.

FIG. 22 is a liquid crystal display device 21f according to a seventh embodiment of the present invention.
FIG.

FIG. 23 is a plan view of a liquid crystal display device 21f.

FIG. 24 is a liquid crystal display device 21g according to an eighth embodiment of the present invention.
FIG.

FIG. 25 is a plan view of a liquid crystal display device 21g.

FIG. 26 is a perspective view of a conventional liquid crystal display device 1.

27 is a sectional view taken along the line X27-X27 in FIG.

FIG. 28 is a process drawing showing the manufacturing process of the display device 1 of the conventional art.

[Explanation of symbols]

21, 21a, 21b, 21c, 21d, 21e, 21
f, 21g Liquid crystal display device 22, 23 Glass substrate 25 Sealing material 26 Display part 27 Peripheral part 28 Display panel 29 Integrated circuit 30 Flexible wiring board 31 Common line 34, 35, 63, 73, 83 Insulating film 36 Through hole 37 Signal wiring 38, 39 Relay common line 40, 41, 70 Connection part 44, 45 Input terminal 46, 47 Output terminal 48, 49 Electrode terminal 51 Protective resin layer 53-63, 66, 67, 69, 71 Connection wiring 57 Branch wiring 58 Inside Wiring 59 Anisotropic conductive film 72 Connection line

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] August 3, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Title: Mounting structure and mounting method of display device

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure and mounting method for a display device, and more specifically, it displays an image on a liquid crystal display device, an EL (electro luminescence) display device and a plasma display device. The present invention relates to a mounting structure and a mounting method for mounting a flexible substrate, various circuit components, or the like on the display panel in a display device in which electrode terminals are arranged on the periphery of a display panel including a display section.

[0002]

2. Description of the Related Art Among various display devices, a liquid crystal display device will be described below. FIG. 26 is a perspective view of a conventional liquid crystal display device 1, and FIG. 27 is a sectional plane line X2 of FIG.
It is sectional drawing seen from 7-X27.

As shown in FIG. 26 and FIG. 27, a liquid crystal display device 1 is constituted by enclosing a liquid crystal between a pair of glass substrates 2 and 3, and has a display panel 6 having a display section 6 for displaying an image. 7 and a wiring board or a flexible wiring board, which will be described later, connected to the display panel 7.

The display panel 7 has a peripheral portion 4 of the glass substrate 2.
Is provided with a large number of electrode terminals 5. The electrode terminal 5 is made of a material such as ITO, Ta, Ti, Mo, Cu, Al or Au, and has a single layer or multiple layers, and a film thickness of 50 nm to several tens.
0 nm, line width 10 μm to several 100 μm, resistivity 0.1Ω
/ □ to several hundreds Ω / □. A driving integrated circuit element (IC, hereinafter integrated circuit) for driving the display panel 7 to display on the electrode terminals 5 in the peripheral portion 4 of the display panel 7.
The output electrode terminals 14 of the plurality of flexible wiring boards 9 and 9a on which the 8 and 8a are mounted are connected to each other through the anisotropic conductive film 15. The output electrode terminal 14 is Sn or A
u-plated material such as Cu, film thickness 10 ~ 60μ
m, and the line width is 0.1 mm to 2 mm. The flexible wiring boards 9 and 9a are mounted on the common wiring board 10. The input electrode terminal 16 for inputting a control signal or the like to the integrated circuits 8 and 8a is arranged on a side different from the side where the output electrode terminal 14 is arranged on each flexible wiring board 9 and is common. Solder 17 to the electrode terminals 18 connected to the bus lines 13 and 13a of the wiring board 10.
Are respectively connected using.

The common wiring board 10 has a substantially L shape along the peripheral portion 4 of the display panel 7 and receives a control or display signal from the outside from the control board 12. The control board 12 supplies a signal to the common wiring board 10 through the connector 11 and is formed in a substantially rectangular shape.

FIG. 28 is a process drawing showing the manufacturing process of the display device 1 of the prior art. In step a1, the solder 17 is supplied to each electrode terminal 18 of the common wiring board 10 by printing or plating. In step a2, the anisotropic conductive film 15 is formed on the electrode terminals 4 in the peripheral portion 4 of the display panel 7.
To form. In step a3, each electrode terminal 4 of the display panel 7 and each output electrode terminal 1 of each flexible wiring board 9
Mutual positioning with 4 is performed.

In step a4, the display panel 7 and each flexible wiring board 9 are connected to each other by thermocompression bonding. In step a5, each flexible wiring board 9 and the common wiring board 10 are positioned. In step a6, the flexible wiring boards 9 and the common wiring board 10 are connected to each other by heating. The mounting technology for this type of connection is the monthly Semiconductor Worl
d Extra number "'93 latest liquid crystal process technology" (Publisher: Press Journal, Inc., Volume 144, Issued October 2, 1992, pages 249 to 252, "Driver IC mounting technology"). ing.

During operation of the liquid crystal display device 1, the common wiring board 1 is connected from the control board 12 via the connector 11.
A control signal is supplied to the 0 bus lines 13 and 13a. Control signals are input to the driving integrated circuits 8 and 8a of the flexible wiring boards 9 and 9a through the bus lines 13 and 13a and the input electrode terminals 16 of the flexible wiring boards 9. The signal output from the integrated circuit 8 is applied to the display electrodes (not shown) formed on the facing surfaces of the glass substrates 2 and 3 via the output electrode terminals 14 and the electrode terminals 5 and 5a. . As a result, the liquid crystal display device 1 is driven for display.

[0009]

Recent liquid crystal display device 1
In the development of (1), there is a strong demand for reducing the size and weight of the liquid crystal display device 1 in which the flexible wiring board 9 and the like are mounted in a mounted state. However, in the above-described conventional mounting structure of the liquid crystal display device 1, the common wiring substrate 10 and the control substrate 12 are arranged on the side of the display panel 7 so as to be separated from the display panel 7.
There is a problem that the size of the liquid crystal display device 1 becomes large. Further, since the liquid crystal display device 1 is provided with two types of relatively large-sized components, the common wiring substrate 10 and the control substrate 12, the weight of the liquid crystal display device 1 is increased and the weight reduction is prevented. Also, the number of parts increases, which increases the material cost. Further, when the number of parts is large and the size is large, the connection portion of the flexible wiring boards 9 and 9a having a structure in which large (heavy) parts are connected is easily affected by external force, and the reliability of the liquid crystal display device 1 is low. There is a problem of becoming.

As shown in steps a4 and a6, the flexible wiring board 9 and the display panel 7 are connected to each other, and the flexible wiring board 9 and the common wiring board 1 are connected.
It is necessary to make a connection with 0 individually. Therefore, in the above-mentioned conventional technique, since the number of connecting steps is large, there is a problem that the number of steps is increased and the cost is increased. Further, if the number of connection steps is large, the probability of occurrence of defects increases, and in this respect as well, there arises a problem that the reliability of the liquid crystal display device 1 decreases.

The present invention has been made in order to solve the above problems, and (1) reduces the number of parts, and (2) thereby realizes simplification of construction, weight reduction and downsizing, (3) It is a first object of the present invention to provide a mounting structure of a display device that can improve reliability, and (4) a display device that reduces manufacturing man-hours (and thus further reduces cost). It is a second object of the present invention to provide a mounting method.

[0012]

According to the mounting structure of a display device of the present invention, a display panel having a peripheral edge portion, and a display panel disposed at the peripheral edge portion of the display panel along the arrangement direction along the peripheral edge portion, are provided. A mounting structure of a display device, comprising: a plurality of wiring boards, each mounting a circuit element for driving a panel, wherein the plurality of wiring boards include an insulating substrate and the arrangement direction in each wiring board. A plurality of connection terminals arranged on the insulating substrate along a direction intersecting the arrangement direction near both ends, and the display panels are adjacent to each other on the peripheral portion. A plurality of wiring boards, each of which is connected to the connection terminal of each of the plurality of wiring boards and is formed between the connection terminals of each of the plurality of wiring boards adjacent to each other; Each of the Connection terminal has a configuration that is connected with the same connecting member to the common line and the other connection terminal of the plurality of the display panel, a result, it is possible for the object can be achieved.

The display device mounting structure according to the present invention includes a display panel having a peripheral edge portion, and a driving circuit element for the display panel, which is arranged in the peripheral edge portion of the display panel along the arrangement direction along the peripheral edge portion. A mounting structure of a display device, comprising: a plurality of wiring boards each mounting a plurality of wiring boards, wherein the plurality of wiring boards include an insulating board and the array in the vicinity of both ends in the array direction in each wiring board. A plurality of connection terminals respectively arranged on the insulating substrate along a direction intersecting the direction, and the display panel has one of the connection terminals of the plurality of wiring boards on the peripheral portion. A plurality of common lines that are connected in common to each other and are formed over a range including the arrangement range of the plurality of wiring boards, and the connection terminals of each of the plurality of wiring boards are the common lines on the display panel. And other connections It has a configuration that is connected with the same connecting member to the child, by this, the object is achieved.

According to the mounting structure of the display device of the present invention, a display panel having a peripheral portion, and the peripheral portion of the display panel,
A mounting structure of a display device, comprising: a plurality of wiring boards which are arranged along an arrangement direction along the peripheral portion and which respectively mount driving circuit elements of a display panel, wherein the plurality of wiring boards are , An insulating substrate, and in the vicinity of both ends in the arrangement direction in each wiring board, at least a part of a plurality of connection terminals near the both ends are electrically connected to each other between the both ends, and the driving circuit element and Each of the display panels is electrically connected to a bypass wiring, and the display panel is connected to at least a part of the connection terminals of each of a plurality of wiring boards adjacent to each other on the peripheral portion, A plurality of first common lines formed between the connection terminals of a plurality of wiring boards adjacent to each other, and on the peripheral portion of the connection terminals of the plurality of wiring boards, Commonly connected to some A plurality of second common lines formed over a range including the arrangement range of the wiring boards, and the connection terminals of each of the plurality of wiring boards are connected to the plurality of first common lines on the display panel. The two common lines and the other connection terminals are connected to each other by using the same connecting material, and thus the above-mentioned object is achieved.

In the present invention, the bypass wiring may include a first bypass wiring formed on the insulating substrate and directly connecting the connection terminals near the both ends to each other. In the present invention, the bypass wiring includes a second bypass wiring formed on the insulating substrate in a range extending from the vicinity of one of the ends to the driving circuit element, and the other of the both ends. A third bypass wiring formed on the insulating substrate in a range extending from the vicinity of the end portion of the driving circuit element to the driving circuit element, and both ends of the third bypass wiring formed in the driving circuit element and serving as the second bypass wiring and the third bypass wiring. In some cases, it includes the bypass wiring in the element connected to each element.

In the present invention, the bypass wiring may be provided on both surfaces of the insulating board in each wiring board.

In the present invention, the first bypass wiring is
It may be provided on the insulating substrate at a position passing between the insulating substrate and the driving circuit element.

In the present invention, the connecting material may be an anisotropic conductive film.

According to the present invention, the display panel has a pair of light-transmissive display substrates each having a display electrode provided on the surfaces facing each other, and at least one of the pair of display substrates is provided. Part or all of the common line is provided in the remaining overlapping area other than the installation area of the display electrodes and the peripheral portion in the area overlapping with the opposing display substrate of one display substrate. There are cases.

A display device mounting method according to the present invention is a mounting method for obtaining a mounting structure for each display device, wherein driving circuit elements for the display panel are respectively provided in the peripheral portion of a display panel having a peripheral portion. A plurality of mounted wiring boards are aligned, and a signal input terminal of the wiring board, a signal input terminal for bypass, and a signal output terminal to the display panel are collectively connected to the display panel and the display panel via the connecting material. It includes the steps of connecting the wiring boards, and thereby achieves the above object.

[0021]

According to the mounting structure of the invention of claim 1, the display device has a display panel having a peripheral portion, and the display panel is arranged along the peripheral direction at the peripheral portion of the display panel. And a plurality of wiring boards on which the driving circuit elements of the panel are respectively mounted. The plurality of connection terminals arranged on the plurality of wiring boards are respectively arranged on the insulating board along the direction intersecting the arrangement direction in the vicinity of both ends of the arrangement direction in each wiring board. .
In addition, bypass wiring is provided on each of the plurality of wiring boards. The bypass wiring is electrically connected to the drive circuit element by electrically connecting at least a part of the plurality of connection terminals near the both ends of each wiring board between the both ends.

With such a structure of each wiring board, the wiring resistance for routing the common line becomes lower than that in the case where the connection terminals are arranged in parallel to the arrangement direction, and the display quality of the display device is stabilized. .

The display panel is connected to the connection terminals of a plurality of wiring boards that are adjacent to each other on the peripheral portion, and the connection terminals of a plurality of wiring boards that are adjacent to each other. And a plurality of common lines formed over the space. The connection terminals of each of the plurality of wiring boards are connected to the plurality of common lines and other connection terminals on the display panel using the same connection material.

With such a structure of the display panel, the area occupied by the display device can be significantly reduced. The reason is that the number of separate wiring boards can be reduced as compared with the case where the common line is provided on the separate wiring board by using a wiring board and a display panel separate from the wiring board.

In this way, the present invention can achieve the following actions.

(1) The display device can be made smaller, thinner and lighter, (2) the material cost and manufacturing cost of the display device can be reduced, and (3) the structure can be made smaller and the flexible wiring board can be used. The reliability of the display device is improved because it is less likely to be affected by external force due to the fact that the two parts are not connected. (4) Further, since the connection terminals of each of the plurality of wiring boards are connected to the plurality of common lines on the display panel and other connection terminals by using the same connection material, Since the connections can be made all at once, the number of manufacturing steps can be reduced.

In the mounting structure of the invention of claim 2, the mounting structure includes a display panel having a peripheral portion and a plurality of wiring boards. The plurality of wiring boards are arranged in the peripheral portion of the display panel along the arrangement direction along the peripheral portion, and each mounts a drive circuit element for the display panel. The plurality of connection terminals provided on the plurality of wiring boards are respectively arranged on the insulating substrate in the vicinity of both ends of the wiring board in the arrangement direction along a direction intersecting the arrangement direction.

The common line formed on the display panel is commonly connected to a part of the connection terminals of each of the plurality of wiring boards on the peripheral portion of the display panel. Further, the common line is formed on the display panel over a range including an array range of the plurality of wiring boards. The connection terminals of each of the plurality of wiring boards are connected to the common line and other connection terminals on the display panel using the same connection material. As a result, also in the present invention, it is possible to realize the same operation as that described with respect to the invention of claim 1 above.

In the mounting structure for a display device according to a third aspect of the present invention, by the bypass wiring electrically connected to the driving circuit elements of the plurality of wiring boards, the vicinity of both ends in the arrangement direction in each wiring board is provided. In the above, at least some of the plurality of connection terminals near the both ends are electrically connected to each other near the both ends. On the other hand, in the display panel, the plurality of first common lines connect at least some of the connection terminals of each of the plurality of wiring boards adjacent to each other on the peripheral portion in common, and The connection terminals of the plurality of wiring boards adjacent to each other are connected to each other. In addition, by the plurality of second common lines, some of the connection terminals of each of the plurality of wiring boards are commonly connected on the peripheral portion over substantially all of the plurality of wiring boards. There is. Further, the connection terminals of each of the plurality of wiring boards are connected to the first common line, the second common line and other connection terminals on the display panel using the same connection material. Therefore, even in the present invention,
It is possible to achieve the same operation as the operation described with respect to the invention of claim 1 above.

In the mounting structure of a display device according to a fourth aspect of the invention, the bypass wiring according to the invention described in any one of the first and third aspects includes a first bypass wiring. The bypass wiring is formed on the insulating substrate, and the connection terminals near both ends of each wiring substrate are directly connected to each other. Thereby, a signal sequentially input to each wiring board or a signal transmitted from one end to the other end of the plurality of wiring boards can be transmitted through the first bypass wiring. This eliminates the need to form a wiring corresponding to the first bypass wiring on the peripheral portion of the display panel. Therefore, in the present invention, it is possible to further improve the size reduction, the thickness reduction, and the weight reduction of the configuration of the display panel.

In the mounting structure for a display device according to a fifth aspect of the present invention, the bypass wiring according to any one of the first and third aspects includes a second bypass wiring and a third bypass wiring. Including element bypass wiring. As a result, signals sequentially input to each wiring board, or
A signal or the like transmitted from one end of the plurality of wiring boards to the other end is sequentially transmitted between the plurality of wiring boards via the second bypass wiring, the intra-element bypass wiring, and the third bypass wiring.

This eliminates the need to form wirings corresponding to the second bypass wiring, the third bypass wiring, and the in-element bypass wiring on the peripheral portion of the display panel. Therefore, in the present invention, it is possible to achieve the same operation as that described with respect to the first aspect of the invention, and it is possible to further improve the miniaturization, thinning, and weight reduction of the structure of the display panel.

In the mounting structure for a display device according to a sixth aspect of the invention, the bypass wiring according to the invention according to any one of the first and third aspects is provided on both sides of the insulating substrate in each wiring substrate. ing. As a result, in addition to achieving the same operation as the operation described with respect to the invention of claim 1, it is possible to further improve the miniaturization of the plurality of wiring boards and the miniaturization, thinning, and weight reduction of the configuration of the display panel. You can

In the mounting structure of the display device according to the invention of claim 7, the first bypass wiring in the invention described in claim 4 is on an insulating substrate in the wiring substrate, It is provided at a position that passes between the substrate and the driving circuit element. Therefore, in the present invention, in addition to achieving the same operation as that described with respect to the first aspect of the present invention, the internal wiring for signal transmission of the driving circuit element can be omitted, so that the driving circuit element can be driven. The internal configuration of the circuit element can be simplified, and the driving circuit element can be downsized and the cost can be reduced. In addition, this makes it possible to reduce the size and cost of the display device.

In the mounting structure of the display device according to the eighth aspect of the invention, an anisotropic conductive film is used as the connecting material in the invention according to the first and third aspects. Thus, in the present invention, the same operation as the operation described with respect to the first aspect of the invention can be achieved, and the connecting step in manufacturing the display device can be reduced, so that the connecting process can be performed. The incidence of defective products is reduced, and the manufacturing yield in the mounting process is also improved. Further, the cost can be reduced in terms of the manufacturing process.

In the mounting structure of the display device according to the ninth aspect of the invention, the display panel according to the invention described in the first and third aspects has a pair of display substrates. In the pair of display substrates, in at least one display substrate overlapping with the opposing display substrate, the common line is provided in the remaining overlapping region and the peripheral portion other than the display electrode installation region. Are provided in part or in whole. That is, in the present invention, the area where the common line is formed is
It is enlarged more than the peripheral portion of the display panel. Thus, in the present invention, the same operation as the operation described with respect to the first aspect of the invention can be achieved, and the number of common lines formed in the peripheral portion can be reduced, and the area of the peripheral portion can be reduced. Can be reduced. As a result, the display device can be downsized. In addition, since the area in which the common lines are formed is larger than the peripheral portion of the display panel, the arrangement density of the common lines can be lowered and the occurrence of short circuits between common lines and insulation failure can be prevented. Therefore, the reliability of the display device can be improved. Furthermore, the production efficiency of the display device can be improved.

Further, since the area in which the common line is formed is wider than the peripheral portion of the display panel, the wiring width of the common line is widened and the resistance value is lowered, thereby temporally changing the signal transmitted through the common line. The delay is reduced. Accordingly, when the transmitted signal is an image signal, it is possible to prevent a situation in which noise is mixed in the image signal and the waveform of the image signal is undesirably deformed. As a result, it is possible to prevent a defect from occurring in the displayed image.

A display device mounting method according to a tenth aspect of the present invention is a mounting method for obtaining the display device mounting structure according to any one of the first to ninth aspects, and is performed as follows. On the common line and other terminals on the periphery of the display panel,
The facing connection terminals of the plurality of wiring boards on which the driving circuit elements of the display panel are mounted are respectively aligned. The connection terminals of the plurality of wiring boards are connected to the common line and other connection terminals in the peripheral portion of the display panel via a connecting material. When the common line is provided on a wiring board different from the display panel or the plurality of wiring boards, between the plurality of wiring boards and the display panel and between the plurality of wiring boards and the different wiring boards Each connection process between and is required. In the mounting method of the present invention, the step of connecting the plurality of wiring boards and the separate wiring board is unnecessary. As a result, the number of man-hours for mounting the display device is significantly reduced, and the mounting process of the display device is simplified.

[0039]

EXAMPLES The mounting structure and mounting method of the display device of the present invention will be described in detail below with reference to examples.

FIG. 1 is a perspective view of a liquid crystal display device 21 according to an embodiment of the present invention, FIG. 2 is a plan view of the flexible wiring board 30 of the liquid crystal display device 21, and FIG. 3 is a liquid crystal display device. 21 is an exploded view of the vicinity of the flexible wiring board of FIG. 21, FIG. 4 is a sectional view taken along the section line X4-X4 of FIG. 2, and FIG. 5 is a section taken along the section line X5-X5 of FIG. It is a figure. In the following description, the liquid crystal display device 21 will be exemplified. The embodiment of the present invention is not limited to the liquid crystal display device 21, but is applied to a wide variety of matrix-driven display devices such as the EL display device or the plasma display device.

In this embodiment, a liquid crystal display device (hereinafter,
The display device 21 injects a liquid crystal (not shown) between a pair of rectangular glass substrates 22 and 23 having transparent electrodes (not shown) formed on the surfaces facing each other, and surrounds them. Display panel 2 configured by sealing with a sealing material
Contains 8. The transparent electrode arrangement area on each of the glass substrates 22 and 23 included in the display panel 28 is defined as a display unit 26 on which an image is displayed. Ten flexible circuits as an example in which driving integrated circuits 29 and 29a for driving the liquid crystal display device 21 are mounted on the peripheral edge portion 27 of the one glass substrate 22 other than the overlapping area with the other glass substrate 23. The wiring boards 30 and 30a are attached. The outer peripheral edge portion 27 is the glass substrate 22.
Is an L-shaped region along two sides adjacent to each other.
The flexible wiring boards 30 and 30a have an insulating film 43 made of an electrically insulating material such as a polyimide resin or a polyester resin as an example. Various terminals and wirings, which will be described later, are formed on the insulating film 43.

A common line 31, 31a for supplying a signal or power commonly input to each flexible wiring board 30, 30a is provided in the peripheral portion 27, and a plurality of flexible wiring boards 30 are arranged in the peripheral portion 27. It is formed continuously over the range. Common line 3 on the periphery 27
A signal or a driving power source commonly supplied to the flexible wiring boards 30 is supplied to the terminals 1 and 31a from the control board 32 via the connector 33. The display device 21 is configured to include the display panel 28, the plurality of flexible wiring boards 30, and the control board 32.

As shown in FIGS. 2 to 5, an insulating film 34 is formed on the glass substrate 22 of the display panel 28 by forming Ta ₂ O ₅ or the like as an example. When a source electrode or a gate electrode inside the display unit 26 is formed on the insulating film 34, the plurality of common lines 31 have a length of almost the entire length of the peripheral edge portion 27, such as ITO, Ta, Ti, Mo. , C
u, Au, Al, Ag paste, etc., single layer or multilayer, film thickness 50 nm or more, line width several μm to several m
m, resistance 0.1Ω / □ to several hundreds Ω / □.
On the glass substrate 22 on which the common line 31 is formed,
The insulating film 35 is formed of a material such as SiN, SiO ₂ , Ta ₂ O ₅ or polyimide so as to have a plurality of through holes 36.

Further, in the plurality of pixels arranged in a matrix in the display section 26 on the insulating film 35, for example, they are respectively connected to the pixel groups in each column and spread in a substantially fan shape toward the pixels. A plurality of signal wirings 37 having a shape, and a relay common line 38 for a signal having a length extending between the end portions of the flexible wiring boards 30 adjacent to each other on the peripheral edge portion 27, which are opposed to each other. A relay common line 39 for power supply is formed. Relay common line 38, 3
9 is ITO, Ta, Ti, Mo, Cu, Au, Al,
A single layer or multiple layers made of a material such as Ag paste, a film thickness of 50 nm or more, a line width of several μm to several mm, and a resistance of 0.1 Ω /
□ to several hundreds Ω / □. Relay common line 3
8 and 39, as shown in FIG. 2 and FIG.
The plurality of flexible wiring boards 30 in FIG. 7 are arranged along the direction perpendicular to the arrangement direction (horizontal direction in FIGS. 2 and 3). Rectangular connection parts 40 are formed at equal pitches at each end of each signal line 37. Each connecting portion 40 is made of ITO, Ta, Ti, Mo, Cu, Au, A
1, a material such as Ag paste is formed in a single layer or in multiple layers with a film thickness of 50 nm or more, a line width of several μm to 100 μm, and a resistance of 0.1 Ω / □ to several hundred Ω / □. The plurality of connecting portions 40 are arranged along the arrangement direction.

On the peripheral portion 27 of the glass substrate 22,
A plurality of lead-in lines 42 are formed, one end of which is connected to the common line 31 through the through hole 36 of the insulating film 35 and the other end of which extends toward the end of the peripheral edge 27. The ends of the lead-in lines 42 are respectively connected to the rectangular connecting portions 41 arranged on the peripheral edge portion 27 along the arrangement direction. Common line 3 like this
An insulating film 63 is formed to cover 1 and the lead-in line 42.

On the other hand, each flexible wiring board 30 is formed in a substantially rectangular shape, and is usually a TAB (Tape Automat).
ed Bonding) substrate. Each flexible wiring board 30 is a glass substrate 22 of a flexible base material 43.
The relay common line 38 on the input side,
Input terminals 44 and 45 respectively connected to 39 are provided. These input terminals 44 and 45 are shown in FIGS.
As shown in FIG. 5, one end portion of each flexible wiring board 30 along the arrangement direction is arranged along the direction perpendicular to the arrangement direction.

A plurality of electrode terminals respectively connected to the plurality of connecting portions 40 at the end portion adjacent to the one end portion of each flexible wiring board 30 and facing the glass substrate 22. 48 are arranged along the arrangement direction. Further, the plurality of electrode terminals 49 respectively connected to the connecting portions 41 are arranged in the arrangement direction. In each flexible wiring board 30, at the end opposite to the end where the input terminals 44 and 45 are installed along the arrangement direction, in the same arrangement as the input terminals 44 and 45, Output terminals 46 and 47, which output signals of the same type as the signals input to the input terminals 44 and 45, are arranged along a direction perpendicular to the arrangement direction. Input terminal 4
4, 45 and the output terminals 46, 47 are made of a material such as Sn or Au plated Cu or aluminum and have a film thickness of 10 to 6
The line width is about 0 μm and the line width is several μm to several mm.

On the other hand, a storage hole 50 for storing the integrated circuit 29 is formed at a position away from each end of each flexible wiring board 30, and the integrated circuit 29 in each storage hole 50 is formed.
Is firmly covered with a protective resin layer 51 such as an epoxy resin. The integrated circuit 29 includes a plurality of electrode bumps 52.
Is equipped with. In the flexible wiring board 30, the input terminals 44 and 45, the electrode terminals 48 and 49 and the output terminals 46 and 47, and the corresponding electrode bumps 52 of the integrated circuit 29.
And a plurality of connection wirings 53 and 54 for respectively connecting
And 55 are formed. The input terminal 44 and the electrode terminal 4
Alignment marks 100 are usually formed at two positions among 8, 49 and the output terminal 46.

On each flexible wiring board 30, a connection wiring 56 for directly connecting the input terminal 45 and the output terminal 47 is formed, and a branch wiring for connecting the connection wiring 56 and the corresponding electrode bump 52 of the integrated circuit 29. 57 is formed. Further, the signal input from the input terminal 44 to the flexible wiring board 30 includes a signal to be transmitted to another adjacent flexible wiring board 30. In order to perform such transmission, a plurality of internal wirings that directly connect the input connection wiring 53 and the output connection wiring 101 corresponding to the signal to be transmitted inside the integrated circuit 29. 58 is formed in integrated circuit 29. In each flexible substrate 30, the connection wiring 56 and a part of the connection wiring 53 are connected to a chip capacitor 60 for signal adjustment.
As a result, the display quality difference between the integrated circuits 29 of each flexible substrate 30 is reduced.

The anisotropic conductive film 59 is used for the connection between the display panel 28 and each flexible substrate 30.

FIG. 6 shows the display device 2 according to one embodiment of the present invention.
2 is a flowchart showing the manufacturing process of No. 1 and FIG. 7 is a sectional view showing the manufacturing process.

The manufacturing process of this embodiment will be described below with reference to the drawings. When mounting each flexible substrate 30 on the display panel 28, the anisotropic conductive film 59 is formed at a connection portion of a plurality of predetermined flexible substrates 30 in the peripheral edge portion 27 of the display panel 28 in step b1 in FIG. Attached or applied. In step b2, the flexible wiring boards 30 are respectively aligned with a plurality of predetermined positions on the peripheral edge portion 27 of the display panel 28. Specifically, the peripheral portion 27 of the display panel 28 and the plurality of flexible wiring boards 30 are opposed to each other, and the connection portions 40 and 41, the electrode terminals 48 and 49, and the arrangement direction of one flexible wiring board 30. Relay common lines 38 and 39 located at both ends and input and output terminals 4
4, 45, 46, and 47 are aligned on a one-to-one basis for each flexible substrate 30.

Then, in step b3, the display panel 28 on which the aligned flexible wiring boards 30 are mounted has a shape for pressing the connection area of each flexible wiring board 30 to the display panel 28. It heats using the thermocompression bonding head 61 which has the one or several pressing part 62 shown in FIG. As a result of this heating, as shown in FIG. 7, the connecting portions 40 and 41 and the electrode terminals 48 and 49 are combined into one flexible wiring board 3 again.
Relay common lines 38 located at both ends in the arrangement direction of 0,
39 and the input and output terminals 44, 45, 46, 47,
Thermocompression bonding is performed through the anisotropic conductive film 59. This completes the process of mounting the plurality of flexible wiring boards 30 on the display panel 28.

Thus, the electrodes facing each of the connecting portions 40, 41, the terminals 44, 45, 46, 47, 48, 49 and the relay common lines 38, 39 are electrically connected together. You can

As described above, the structure of the display device 21, specifically, the display panel 28 and each flexible wiring board 3
The connection terminals 44 to 47 for the 0 and the connection terminals arranged in parallel with each arrangement direction of each flexible substrate 30 in the display panel 28 and the connection terminals arranged in the direction perpendicular to the arrangement direction. By including, all the connection terminals 44 to 47 may be able to reduce the size of each flexible wiring board 30 along the arrangement direction, as compared with the case where they are arranged in parallel to the arrangement direction,
It is possible to reduce the resistance of the lead wire of the common line and maintain good display quality.

Further, the occupied area of the display device 21 can be remarkably reduced by the structure of the display panel 28 as described above. This is because a separate wiring board is used for the display panel 28 and the flexible wiring board 30,
26. Providing a common line 31 on the separate wiring board
This is because it is possible to reduce the number of separate wiring boards as compared with the related art shown in FIG.

In this way, in the present embodiment, the display device 21 is made smaller, thinner, and lighter, and further, because of the downsizing of the structure, it is less likely to be affected by external force, and the reliability of the display device 21 is improved. Can be improved.

The region where the anisotropic conductive film 59 is provided is
Each terminal 44, 45, 46, 47, 48, 49 is individually covered, and each terminal 44, 45, 46, 47, 48,
The area may be about 49, but it may be provided all over the outside of the insulating film 63. Further, instead of the anisotropic conductive film 59, solder, photocurable resin, or other connecting material may be used.

In this way, as shown in FIG. 1, one side of the liquid crystal display device 21 has wiring patterns that are the same as each other, and as an example, a plurality of flexible wiring boards for driving the scanning lines of the liquid crystal display device 21. 30 a is connected to the display panel 28. Further, the other side of the liquid crystal display device 21 has a wiring pattern different from that of the flexible wiring board 30a, and as an example, the flexible wiring board 30 for driving the data lines of the liquid crystal display device 21 is connected to the display panel 28. To be done. Further, at the corner 64 of the peripheral edge 27 of the glass substrate 22, the common line 31 and the relay line 38,
A control board 32, which supplies a signal for driving the liquid crystal display device 21, is connected to 39 through a connector 33.

During operation of the liquid crystal display device 21, the display device 2 is passed from the control board 32 through the connector 33.
A driving signal is supplied to the common lines 31 and 31a and the relay lines 38, 38a and 39 of the peripheral portion 27 of No. 1. This signal is transmitted from the connection portion 41 and the terminals 44 and 45 shown in FIGS. 2 and 3 to the wiring 5 of the flexible wiring board 30.
The integrated circuit 29 is driven via 3, 55, and the output signal is supplied to the pixel electrode (not shown) of the liquid crystal display device 21 through the wiring 54 and the terminal 48. As a result, the liquid crystal display device 21 is driven.

The drive signal is branched via the input terminal 44 of the flexible wiring board 30 and the connection wiring 53, and the lower wiring or the internal wiring 58 of the integrated circuit 29,
It is supplied to the input terminal 44 of the flexible wiring board 30 adjacent to the flexible wiring board 30 via the connection wiring 101, the output terminal 46 and the relay line 38. And
The data is input from the input terminal 44 to the driving integrated circuit 29 via the connection wiring 53 of the adjacent flexible wiring board 30. The signal output from the driving integrated circuit 29 passes through the output terminal 48 of the flexible wiring board 30 and the connecting portion 40 of the peripheral portion 27, and then the display portion 26 of the display panel 28.
Supplied internally.

In this manner, the drive signal is supplied to the connecting portions 40 respectively corresponding to the plurality of flexible wiring boards 30 mounted on one side of the peripheral edge portion 27 of the liquid crystal display device 21. The drive signal is similarly supplied to the connection portion 40 corresponding to the flexible wiring board 30a (see FIG. 1) mounted on the other side of the liquid crystal display device.

In this liquid crystal display device 21, the common wiring board 10 arranged laterally of the conventional liquid crystal display device 1 is used.
(See FIGS. 26 and 27) is omitted, so that the size of the liquid crystal display device 21 can be reduced, the liquid crystal display device 21 can be made thinner and lighter, and the cost can be reduced. You can

Moreover, the connection between the relay lines 38 and 39 of the peripheral portion 27 of the liquid crystal display device 21 and the input terminals 44 and 45 of the flexible wiring board 30, the flexible wiring board 30.
Connection between the output terminals 46 and 47 and the relay lines 38 and 39, and the connection portions 40 and 41 and the flexible wiring board 30.
The connection with the electrode terminals 48 and 49 is collectively performed via the anisotropic conductive film 59. Therefore, the number of connection steps in manufacturing the liquid crystal display device 21 can be reduced, so that the incidence of defective products in the connection process is reduced, and the manufacturing yield in the mounting step is also improved. Further, the cost can be reduced in terms of the manufacturing process.

Further, in this embodiment, the common wiring board in the prior art is not adopted, and the connecting step between the flexible wiring board 30 and the common wiring board is not performed.
Therefore, the number of manufacturing steps can be reduced and the cost can be reduced as compared with the conventional case. Moreover, since the number of parts is reduced, the reliability of the liquid crystal display device 21 can be significantly improved.

In this embodiment, the signals sequentially transmitted through the flexible wiring boards 30 are the relay common line 3
8 and 39 and the connection wiring 56 in each flexible wiring board 30. Therefore, the common line 3 formed by using the thin film technique on the peripheral portion 27 of the display panel 28.
It is possible to reduce the wiring resistance associated with the signal transmission, as compared with the case where the signal is transmitted using only one. Further, the line widths of the input terminals 44, 45, the output terminals 46, 47 and the electrode terminals 48, 49 of the flexible wiring board 30 can be increased, and the relay common lines 38, 39 of the display panel 28,
The line width of the connecting portions 40 and 41 can be increased. As a result, each flexible wiring board 30 is attached to the display panel 28.
It is possible to reduce the connection resistance when mounting.

The flexible wiring board 3 of this embodiment is also used.
0, a resin having an electric insulation property is partially applied to the surface on the side where the input terminals 44 and 45 are formed except for the connection terminal portion to form an insulating film, and a plurality of input terminals 44 are formed. , 45, terminals 48, 49, connection wirings 53, 54, 5
The reliability of the electrical insulation of the output terminals 5, 101, 56 and the output terminals 46, 47 from each other may be increased.

FIG. 8 is a plan view of a flexible wiring board 30b which is a modified example of the flexible wiring board 30 used in the liquid crystal display device 21 of the present invention in the above embodiment. In the flexible wiring board 30b of this modified example, the corner portions at both ends of the side of the insulating film 43 of the flexible wiring board 30 of the embodiment facing the display panel 28 are cut out to form the cutout portions 66. There is.

Of the plurality of input terminals 44 formed on the flexible wiring board 30b, the signal input to the input terminal 44 is, for example, the flexible wiring board 3
If the signal is the first type signal to be input to the integrated circuit 29 mounted on 0, the first type signal is input to the integrated circuit 29 from the input terminal 44a through the connection wiring 53. This signal is processed inside integrated circuit 29,
Output another waveform signal and pass through the connection wiring 55 to the terminal 4
A signal is sent to the adjacent flexible wiring board 30 through 6a. If the input signal is, for example, the second type of signal that is to be input to the integrated circuit 29 and is to be transmitted to another adjacent flexible wiring substrate 30 without changing the signal waveform, this The input terminal 44b to which the two types of signals are input is the integrated circuit 29
Is connected to the input terminal 44 by the connection wiring 53.
The output terminal 46b corresponding to b is directly connected by the connection wiring 56.

For example, the input signal should be transmitted to another flexible wiring board 30 adjacent thereto without being input to the integrated circuit 29, or to another electrode (for example, a common electrode) on the panel. If it is a signal of three types, the input terminal 44c to which the signal of the third type is input
Are directly connected to the output terminal 46c corresponding to the input terminal 44c by the connection wiring 56. The input terminal 45 is connected to the output terminal 47 corresponding to the input terminal 45 by the connection wiring 56, and a part of the connection wiring 56 is connected to the integrated circuit 29 by the branch wiring 57.

Such a flexible wiring board 30b
Is mounted on the display panel 28 by a mounting process similar to the mounting process of the above embodiment. At this time, a gap is formed by the cutout portion 66 between the plurality of adjacent flexible wiring boards 30b mounted on the display panel 28. As shown in FIG. 8, a part of the input terminals 44b and 44c, a part of the connection wiring 56, and a part of the output terminals 46b and 46c are exposed to the outside from this gap. Therefore, when the flexible wiring board 30b is used, the panel side is covered with an insulating film made of a material such as SiN or polyimide, taking the gap as an example. The cutout 66
Need not be formed.

FIG. 9 is a perspective view of a liquid crystal display device 21a according to a second embodiment of the present invention, and FIG. 10 is a sectional view when the present embodiment is slightly modified. The liquid crystal display device 21a of the present embodiment is similar to the liquid crystal display device 21 of the first embodiment, and corresponding parts are designated by the same reference numerals. In the second embodiment, the flexible wiring boards 30 and 30a are aligned with the peripheral edge portion 27 of the display panel 28 and temporarily fixed, and then the flexible wiring boards 30 and 30a.
At 0 a, the portion protruding outward from the peripheral edge portion 27 of the display panel 28 is bent by winding the peripheral edge portion 27 of the display panel 28 as shown in FIG. 9. By this bending processing, the display panel 28 of the liquid crystal display device 21 has a structure in which it is sandwiched between the flexible wiring boards 30 and 30a at the peripheral edge portion 27 thereof.

As a result, each flexible wiring board 3
The liquid crystal display device 21a corresponding to the bent portions of 0 and 30a
The size of can be further reduced.

The structure of this embodiment is modified so that the flexible substrates 30 and 30a are aligned with the peripheral edge portion 27 of the display panel 28 and temporarily fixed as shown in FIG. Using the clip 67 made of a shape memory alloy or a shape memory resin, the display panel 28 is sandwiched at the peripheral edge portion 27 from the outer peripheral side of the flexible wiring board 30 bent as described above, and the relay line 3
8, 39 and the connecting portions 40 and 41, and the corresponding input terminals 44 and 45, output terminals 46 and 47 and terminals 48,
49 and 49 may be pressure-bonded to each other for main connection. As a result, the connection terminals of the display panel 28 and the flexible wiring board 30 are easily and firmly connected to each other. Further, at this time, in order to prevent the clip 67 from directly contacting and destroying the integrated circuit 29, a spacer 200 is attached so as to set a predetermined distance between the lower surface of the glass substrate 22 and the clip 67. Is also good.

In this embodiment, the same effects as those described in the above embodiments can be achieved, and the display panel 28 and the plurality of flexible wiring boards 30 are not firmly adhered to each other. Since they are simply pressed together, even if an abnormality such as electrostatic breakdown occurs in the integrated circuit 29 after assembly, it can be easily replaced for each flexible wiring board 30.

FIG. 11 is a plan view of a liquid crystal display device 21b according to a third embodiment of the present invention, FIG. 12 is a sectional view taken along section line X12-X12 of FIG. 11, and FIG. 1
It is sectional drawing seen from the cutting plane line X13-X13 of FIG. This embodiment is similar to the first embodiment, and the same reference numerals are given to corresponding parts.

The first remarkable point of this embodiment is that the common line 31 is not formed on the display panel 28 of the first embodiment. Therefore, the signals to be mutually transmitted between the plurality of flexible wiring boards 30 mounted on the display panel 28 include the plurality of relay lines 38 and 39 formed on the display panel 28 and each flexible wiring board 30. Is transmitted by the plurality of input terminals 44 and 45 and the plurality of output terminals 46 and 47 in the above.

As a result, as in the first embodiment,
The wiring structure in which the common line 31 and the signal wiring 37 extending inside the display panel 28 intersect can be eliminated. Therefore, on the display panel 28, it is possible to omit the structure in which the common line 31 and the signal line 37 are partially stacked with the insulating film 35 interposed therebetween, and a step due to the film thickness of the common line 31 can be omitted. Therefore, it is possible to prevent the signal wiring 37 from causing a connection failure, a disconnection, or the like, or to prevent a short circuit between the common line 31 and the signal wiring 37. Further, since the common line 31 is eliminated, the display The area of the peripheral portion 27 of the panel 28 shown in FIG. 1 is reduced,
The glass substrate 22 can be downsized. Therefore, when a plurality of glass substrates 22 are cut out from a large-sized substrate of a fixed size, the number of glass substrates 22 obtained can be increased, and the cost can be reduced.

The second remarkable point of this embodiment is that, in each flexible wiring board 30, all the signals transmitted from the input terminals 44, 45 to the output terminals 46, 47 are inside the integrated circuit 29. That is, it was designed to pass through a straight line. That is, all the input terminals 44 and 45 of each flexible wiring board 30 are respectively connected to the input terminals 68 of the integrated circuit 29 by the plurality of connection wirings 53a. In each flexible wiring board 30, the output terminal 68 of the integrated circuit 29 mounted therein is connected to all the output terminals 46 and 47 by a plurality of connection wirings 55a.

Therefore, in order to directly connect the input terminals 44 and 45 and the output terminals 46 and 47 to each other, on each flexible wiring board 30, in an area outside the integrated circuit 29 (a portion indicated by a dimension d1). It is possible to omit a plurality of connection wirings formed by drawing and reduce the area of the outer region corresponding to the dimension d1. Further, this makes it possible to reduce the size of each flexible wiring board 30 and to reduce the cost thereof, and thus to realize the miniaturization and cost reduction of the liquid crystal display device.

The third remarkable point of this embodiment is that the input terminals 44 and 45 and the output terminal 4 in the first embodiment are the same.
6, 47 and the electrode terminal 49 are arranged in the first direction (FIG. 2) in which the lead-in line 42 in the display panel 28 is arranged.
And the vertical direction (FIG. 11) and the second direction (horizontal direction in FIGS. 2 and 11) perpendicular to the above. As a result, the electrode terminals 49 are
In some cases, the length of each flexible wiring board 30 along the first direction can be shortened as compared with the case where the flexible wiring boards 30 are arranged along the first direction. Further, the wiring resistance can be reduced as compared with the case where the signal line is routed through the common line 31.

As a modification of this embodiment, at least one of the relay lines 38 may be linearly formed on the glass substrate 22 over the plurality of flexible wiring substrates 30. Such at least one relay line 38 may be formed on the insulating film 34 as an example, an insulating film may be formed on at least one relay line 38, and the signal wiring 37 may be formed thereon. Alternatively, the signal wiring 37 formed on the insulating film 34 may be covered with a new insulating film, and the at least one relay line 38 may be formed on the new insulating film. At this time, the relay line 38 is further covered with an insulating film having a through hole at a position corresponding to the input terminal 44 or at a position corresponding to the input terminal 44 and the output terminal 46.

In such a modification, as compared with the first embodiment, the wiring line resistance can be reduced more than the common line 31 is provided because the lead-in wiring 42 is omitted. Further, in this modification, a structure in which the at least one relay line 38 is provided between the flexible wiring substrate 30 and the glass substrate 22 is realized. As a result, the size of the display panel can be made smaller than that of the first embodiment. This may reduce the manufacturing cost of the display panel 28.

In this modification, the input terminal 44 and the connection wiring 53 corresponding to the at least one relay line 38 are provided.
a wiring pair with a or the output terminal 46 and the connection wiring 55a
The flexible wiring board 30 may be simplified by omitting either one of the wiring groups. Alternatively, the input terminal 4 corresponding to the at least one relay line 38
4 and the connection wiring 53a, and the output terminal 46
If the wiring set of the connection wiring 55a and the connection wiring 55a is left as it is, the at least one relay line 38 on the display panel 22 is provided.
And the input terminal 44 on the flexible wiring board 30,
The same signal is transmitted through both the connection wiring 53a, the lower wiring 58, the connection wiring 55a, and the line including the output terminal 46, and the wiring resistance can be reduced in terms of transmission of this signal.

FIG. 14 is a plan view of a liquid crystal display device 21c according to a fourth embodiment of the present invention, and FIG. 15 is a sectional view taken along section line X15-X15 of FIG. In this example,
Similar to the third embodiment, corresponding parts are designated by the same reference numerals.

The point of interest of this embodiment is that all the input terminals 44 and 45 and all the output terminals 46 and 47 of each flexible wiring board 30 are individually and directly arranged in the structure of the third embodiment. That is, a plurality of connection wirings 69 to be connected to are formed. The connection wiring 69 is formed of a material such as Sn or Cu plated with Au. One end of each connection wire 69 is connected to each input terminal 44, 45, and the other end is connected to each output terminal 46, 47. In the intermediate portion of each connection wiring 69, the integrated circuit 29 mounted on the flexible wiring board 30 is connected to the flexible wiring board 3.
It is fixed to a position near the hole 50 formed in the base material 43 of No. 0 by bonding and covered with the protective resin 51.
On each connection wiring 69, a connection portion 70 that is connected to the plurality of electrode bumps 52 of the integrated circuit 29 is formed immediately below the integrated circuit 29.

In this embodiment, it is possible to achieve the same effects as those described in each of the above embodiments. Further, in this embodiment, the internal wiring 58 for signal transmission of the integrated circuit 29 used in the third embodiment can be omitted, so that the internal structure of the integrated circuit 29 can be simplified. Therefore, the integrated circuit 29 can be downsized, and the cost can be reduced. This makes it possible to reduce the size and cost of the liquid crystal display device 21c.

FIG. 16 is a sectional view showing the structure of a first modification of this embodiment, and is a sectional view of the display panel 28 at a cutting position corresponding to FIG. As shown in FIG. 16, the integrated circuit 29 mounted on the flexible wiring board 30 is connected to the connecting wiring 6 on the flexible wiring board 30.
You may make it arrange | position on the side in which 9 is formed. Even in such a modification, the effect of this embodiment can be achieved.

FIG. 17 is a sectional view showing the structure of the second modification of the present embodiment, which is a sectional view of the display panel 28 at a cutting position corresponding to FIG. As shown in FIG. 17, the holes 50 are not formed in the flexible wiring board 30a of this modification. Therefore, in the flexible wiring board 30a of this modification, the connection wiring 69
Is formed on the base material 43 of the flexible wiring board 30a. Further, the integrated circuit 29 to be mounted is arranged on the base material 43 in the flexible wiring board 30a, for example, on the side where the connection wiring 69 of the flexible wiring board 30a is formed. Even in such a modification, the effect of this embodiment can be achieved.

FIG. 18 is a plan view of a liquid crystal display device 21d according to a fifth embodiment of the present invention, and FIG. 19 is a sectional view taken along section line X19-X19 of FIG. In this example,
Similar to the third embodiment, corresponding parts are designated by the same reference numerals.

In this embodiment, the holes 50 are formed in each flexible wiring board 30, and the integrated circuit 29 to be mounted is housed in the holes 50 and reinforced by the protective resin layer 51 to be flexible. Base material 43 of wiring board 30
It is fixed to. The input terminals 44 and 45 and the output terminals 46 and 47 are formed on one surface of the base material 43. On the base material 43 in a wiring state that avoids the hole 50,
In addition, a plurality of connection wirings 71 that directly connect the input terminals 44 and 45 and the output terminals 46 and 47 are formed. The connection wiring 71 is made of a material such as Sn or Cu plated with Au. The predetermined connection wiring 71 such as the connection wiring 71 corresponding to the power line is connected to the chip capacitor 60.
Are connected.

Of the connection wiring 71, the output terminals 46, 4
7 is connected to the electrode bumps 52 of the integrated circuit 29.
There is something to be connected to. In order to connect the connection wiring 71 and the integrated circuit 29, a plurality of connection lines 72 that connect the connection wiring 71 and the electrode bumps 52 of the integrated circuit 29 are formed on the base material 43. Specifically, the insulating film 73 is formed at least in the region that covers each connection line 72.
Through holes 74 are formed in the insulating film 73 at positions corresponding to the respective connection lines 72. This insulating film 7
The plurality of connection wirings 71 are formed in a range extending over the region on the base 3 and the region on the base material 43. Each connection wire 71 is electrically connected to the corresponding connection line 72 via the through hole 74 of the insulating film 73. Also in such an embodiment, the same effects as the effects described in each of the above embodiments can be achieved.

In particular, since the connection wiring 71 and the connection line 72 have a laminated structure, the flexible wiring board 3
The wiring density at 0 can be increased, and the size of the flexible wiring board 30 can be reduced.

FIG. 20 is a plan view of a liquid crystal display device 21e according to a sixth embodiment of the present invention, and FIG. 21 is a sectional view taken along section line X21-X21 of FIG. In this example,
Similar to the fifth embodiment, corresponding parts are designated by the same reference numerals.

The plurality of input terminals 44 and 45 are formed on one surface of the base material 43 of the plurality of flexible wiring boards 30 used in this embodiment. One end of the one surface is connected to the input terminals 44 and 45, extends along the second direction (left and right direction in FIG. 20), and the other end is in the first direction (in FIG. 20) of the integrated circuit 29. A plurality of connection wirings 75 located on the extension of the vertical direction) and a plurality of connection lines 72 extending from each other end of each connection wiring 75 toward each electrode bump 52 of the integrated circuit 29 are formed. Also, a plurality of output terminals 46 and 47 on one surface, one end connected to the output terminals 46 and 47, extending along the second direction (left and right direction in FIG. 20), and the other end being an integrated circuit. A plurality of connection wirings 76 located on an extension of the first wiring 29 along the first direction (the vertical direction in FIG. 20) are formed.

Through holes 78 are formed in the flexible wiring board 30 at positions corresponding to the other ends of the connection wirings 75 and 76, respectively. On the surface of the flexible wiring board 30 opposite to the surface on which the connection wiring 75 is formed, each connection wiring 7 on the signal input side is formed.
The bypass wiring 77 is individually formed between each through hole 78 corresponding to No. 5 and each through hole 78 corresponding to each connection wiring 76 on the signal output side. The bypass wiring 77 is
It is formed of a material such as Sn or Cu plated with Au. One end of each bypass wiring 77 is connected to the other end of the connection wiring 75 through a through hole 78 on the signal input side, and the other end of each bypass wiring 77 is connected through a through hole 78 on the signal output side. It is connected to the other end of the connection wiring 76.

Even in such an embodiment, the same effects as those described in the above-mentioned embodiments can be achieved.
Particularly, in the present embodiment, the connection wirings 75 and 76 are
The connection line 78 and the bypass wiring 77 are formed on both surfaces of the base material 43 so as to be overlapped with each other. Therefore, the wiring density on both surfaces of the flexible wiring board 30 can be increased, and the flexible wiring board 30 and the liquid crystal display device 21e can be downsized.

FIG. 22 is a sectional view of a liquid crystal display device 21f according to a seventh embodiment of the present invention, and FIG. 23 is a liquid crystal display device 2
It is a top view of 1f. This embodiment is similar to the first embodiment, and the same reference numerals are given to corresponding parts.

The present embodiment will be described assuming that the liquid crystal display device 21f is of the active matrix drive type. The liquid crystal display device 21f of the present embodiment includes a pair of glass substrates 2
A plurality of picture element electrodes 79, which are arranged in a matrix, are formed on the glass substrate 22, and a counter electrode 80 facing the picture element electrodes 79 is formed on the glass substrate 23. In the glass substrates 22 and 23, the pixel electrode 79
A region where the group and the counter electrode 80 overlap constitutes the display unit 26. The liquid crystal layer 82 is injected between the glass substrates 22 and 23, and the periphery of the display unit 26 is sealed by the sealing material 25.

In the liquid crystal display device 21f of this embodiment,
The entire area of the glass substrate 22 outside the sealing material 25, the area covered by the sealing material 25, and the area inside the sealing material 25 and the remaining area other than the display portion 26. The plurality of common lines 31, 31b are formed over the entire length. These common lines 3
1 and the common line 31b arranged on the inner side of the sealing material 25 are covered with an insulating film 83 such as a well-known alignment film or protective film (passivation film).

In this embodiment, the area in which the common line 31 is formed is larger than the peripheral portion 27 of the display panel 28. As a result, the area of the peripheral portion 27 can be reduced, and the liquid crystal display device 21f can be downsized. Alternatively, it is possible to reduce the arrangement density of the common lines 31, prevent short circuits between the common lines 31 and defective insulation, and thus the liquid crystal display device 21f.
The reliability of can be improved. Furthermore, the production efficiency of the liquid crystal display device 21f can be improved at the same time.

Further, a part 31b of the common line 31 is arranged using the inside of the sealing material 25 of the display panel 28 except the region of the counter electrode 80, and the wiring width of the common line 31 is widened. Lowering the common line 3
The time delay of the signal transmitted over 1 is reduced. Accordingly, when the transmitted signal is an image signal, it is possible to prevent a situation in which noise is mixed in the image signal and the waveform of the image signal is undesirably deformed. As a result, it is possible to prevent a defect from occurring in the displayed image.

FIG. 24 is a sectional view of a liquid crystal display device 21g according to an eighth embodiment of the present invention, and FIG. 25 is a liquid crystal display device 2
It is a top view of 1g. This embodiment is similar to the seventh embodiment, and the same reference numerals are given to corresponding parts.

The liquid crystal display device 21g of this embodiment has substantially the same structure as the liquid crystal display device 21f. The feature of this embodiment is the arrangement of the common lines 31 and 31c. In the liquid crystal display device 21g of the present embodiment, the area on the glass substrate 22 outside the sealing material 25, the area covered with the sealing material 25, and the inside of the sealing material 25 and the display The plurality of common lines 31, 31a are provided over the entire area formed by the vicinity of the peripheral portion of the portion 26.
Are formed. Among these common lines 31 and 31c, as some of the common lines 31c, only signal lines through which signals such as clock signals that are less likely to pick up noise of the counter electrode 80 are transmitted are arranged under the counter electrode 80, and the common line 3
The layers 1 and 31c are covered with an insulating film 83 such as a well-known alignment film or protective film (passivation film).

Of the area where the common line 31 is arranged, the area that is inward of the sealing material 25 and near the peripheral portion of the display portion 26 is defined as follows. Liquid crystal display device 2
When 1 g is used as a display device such as a computer, for example, the liquid crystal display device 21 g is attached to the computer or the like in a region of the display panel 28 which is included in the display unit 26 and near the peripheral portion of the display unit 26. The displayed image may not be visible from the outside due to the influence of the case or the like. As described above, the vicinity of the peripheral portion of the display unit 26 is included in the display unit 26 but may not substantially contribute to the display. In such a case, even if the common line 31 is formed near the peripheral portion of the display unit 26, it does not affect the display image visually recognized from the outside.

Therefore, in the above case, the common line 31 can be formed on the glass substrate 22. Also in such an embodiment, the same effect as the effect described in the seventh embodiment can be achieved. Further, by forming the common line 31c under the counter electrode 80, the display panel 22
The size of can be reduced.

In the present invention, the connecting material for electrically connecting the display panel 28 and the flexible wiring board 30 is not limited to the anisotropic conductive film 59. A connection technique other than the anisotropic conductive film 59 may be used, such as a connection system using solder or a photo-curable resin, or a clip pressure welding system.

[0108]

The following effects can be obtained by using the present invention.

(1) Since the circuit board forming the common line for the input signal to the integrated circuit is unnecessary, the material cost can be reduced, and the display panel can be made thin, lightweight and compact. it can. Further, since the number of connection steps is reduced, the defect occurrence rate is reduced, and the yield of the mounting step is also improved.

(2) Since the input / output electrode terminals of the flexible wiring board are collectively connected to the electrode terminals of the display panel, the number of mounting steps can be greatly reduced and the cost can be reduced. (3) In the peripheral portion of the display panel, a common line for input signal or power supply is formed between the wiring board and its adjacent wiring board, and the input signal is bypassed in the wiring board. The wiring resistance between the wiring boards connected to both ends of the peripheral edge of the display panel decreases, and the connection width between the wiring board and the electrode terminals of the display panel increases, so that the connection resistance decreases.

(4) By forming a part of the input signal common line outside the counter electrode, the signal delay time is reduced. From the above, it is possible to prevent a defect at the time of displaying an image, provide a good display quality, and provide a compact liquid crystal display device.

(5) The connection method used in this mounting method is mainly an anisotropic conductive film, and when an anisotropic conductive film is used as the connection material in this embodiment, it is not necessary to develop a new connection material. Yes, know-how can be utilized, conventional manufacturing equipment can be easily converted, and capital investment can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a liquid crystal display device 21 according to an embodiment of the present invention.

2 is a plan view of the vicinity of a flexible wiring board of the liquid crystal display device 21. FIG.

FIG. 3 is an exploded perspective view of a liquid crystal display device 21 near a flexible wiring board.

FIG. 4 is a cross-sectional view taken along section line X4-X4 in FIG.

5 is a cross-sectional view taken along the section line X5-X5 in FIG.

FIG. 6 is a flowchart showing manufacturing steps of the display device 21 according to the embodiment of the present invention.

FIG. 7 is a cross-sectional view showing the manufacturing process of the present embodiment.

FIG. 8 is a plan view of a flexible wiring board 30a which is a modification of the flexible wiring board 30 in the embodiment used in the liquid crystal display device 21 of the present invention.

FIG. 9 is a perspective view of a liquid crystal display device 21a according to a second embodiment of the present invention.

FIG. 10 is a cross-sectional view of a modified example of this embodiment.

FIG. 11 is a liquid crystal display device 21b according to a third embodiment of the present invention.
FIG.

12 is a sectional view taken along the section line X12-X12 in FIG.

13 is a cross-sectional view taken along the section line X13-X13 of FIG.

FIG. 14 is a liquid crystal display device 21c according to a fourth embodiment of the present invention.
FIG.

15 is a cross-sectional view taken along the section line X15-X15 in FIG.

FIG. 16 is a cross-sectional view showing a configuration of a first modified example of this embodiment.

FIG. 17 is a cross-sectional view showing the configuration of the second modification of the present embodiment.

FIG. 18 is a liquid crystal display device 21d according to a fifth embodiment of the present invention.
FIG.

19 is a cross-sectional view taken along the section line X19-X19 of FIG.

FIG. 20 is a liquid crystal display device 21e according to a sixth embodiment of the present invention.
FIG.

21 is a cross-sectional view taken along the section line X21-X21 in FIG.

FIG. 22 is a liquid crystal display device 21f according to a seventh embodiment of the present invention.
FIG.

FIG. 23 is a plan view of a liquid crystal display device 21f.

FIG. 24 is a liquid crystal display device 21g according to an eighth embodiment of the present invention.
FIG.

FIG. 25 is a plan view of a liquid crystal display device 21g.

FIG. 26 is a perspective view of a conventional liquid crystal display device 1.

27 is a sectional view taken along the line X27-X27 in FIG.

FIG. 28 is a process drawing showing the manufacturing process of the display device 1 of the conventional art.

[Explanation of reference numerals] 21, 21a, 21b, 21c, 21d, 21e, 21
f, 21g Liquid crystal display device 22, 23 Glass substrate 25 Sealing material 26 Display part 27 Peripheral part 28 Display panel 29 Integrated circuit 30, 30a, 30b Flexible wiring board 31, 31a, 31b Common line 34, 35, 63, 73, 83 Insulating film 36 Through hole 37 Signal wiring 38, 38a, 39 Relay common line 40, 41, 70 Connection part 44, 45 Input terminal 46, 47 Output terminal 48, 49 Electrode terminal 51 Protective resin layer 53-63, 66, 67, 69, 71 Connection wiring 57 Branch wiring 58 Internal wiring 59 Anisotropic conductive film 72 Connection line

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

[Procedure Amendment 5]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

[Procedure correction 6]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 7

[Correction method] Change

[Correction content]

[Figure 7]

[Procedure Amendment 7]

[Document name to be corrected] Drawing

[Correction target item name] Figure 8

[Correction method] Change

[Correction content]

[Figure 8]

[Procedure Amendment 8]

[Document name to be corrected] Drawing

[Correction target item name] Figure 9

[Correction method] Change

[Correction content]

[Figure 9]

[Procedure Amendment 9]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 11

[Correction method] Change

[Correction content]

FIG. 11

[Procedure Amendment 10]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 18

[Correction method] Change

[Correction content]

FIG. 18

[Procedure Amendment 11]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 19

[Correction method] Change

[Correction content]

FIG. 19

[Procedure Amendment 12]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 20

[Correction method] Change

[Correction content]

FIG. 20

[Procedure Amendment 13]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 21

[Correction method] Change

[Correction content]

FIG. 21

[Procedure Amendment 14]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 22

[Correction method] Change

[Correction content]

FIG. 22

[Procedure Amendment 15]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 23

[Correction method] Change

[Correction content]

FIG. 23

[Procedure Amendment 16]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 24

[Correction method] Change

[Correction content]

FIG. 24

[Procedure Amendment 17]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 25

[Correction method] Change

[Correction content]

FIG. 25

[Procedure 18]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 26

[Correction method] Change

[Correction content]

FIG. 26

[Procedure Amendment 19]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 27

[Correction method] Change

[Correction content]

FIG. 27

Claims (10)

[Claims] 1. A display panel having a peripheral edge portion, and a plurality of display panels, each of which is arranged along the peripheral edge portion of the display panel along the arrangement direction and has a driving circuit element for the display panel mounted thereon. A mounting structure of a display device, comprising: a wiring board, wherein the plurality of wiring boards are provided on an insulating board and near both ends of each wiring board in the arrangement direction along a direction intersecting the arrangement direction. A plurality of connection terminals respectively arranged on the insulating substrate and at least a part of the plurality of connection terminals near the both ends are electrically connected to each other near the both ends and electrically connected to the driving circuit element. The display panel is connected to the connection terminals of each of a plurality of wiring boards that are adjacent to each other on the peripheral portion, and the display panel is provided with a plurality of adjacent bypass wirings. Wiring board it A plurality of common lines are formed between the connection terminals, and the connection terminals of each of the plurality of wiring boards are the same as the plurality of common lines on the display panel and the other connection terminals. A mounting structure of a display device connected by using a connecting material. 2. A display panel having a peripheral edge portion, and a plurality of display panels having a peripheral edge portion and arranged in the peripheral edge portion of the display panel along an arrangement direction along the peripheral edge portion, each of which mounts a drive circuit element for the display panel. A mounting structure of a display device, comprising: a wiring board, wherein the plurality of wiring boards are provided on an insulating board and near both ends of each wiring board in the arrangement direction along a direction intersecting the arrangement direction. A plurality of connection terminals respectively arranged on the insulating substrate and at least a part of the plurality of connection terminals near the both ends are electrically connected to each other near the both ends and electrically connected to the driving circuit element. The display panel is connected to a part of the connection terminals of each of the plurality of wiring boards in common on the peripheral portion, and includes the arrangement range of the plurality of wiring boards. Formed over a range And a plurality of common lines, and the connection terminals of each of the plurality of wiring boards are connected to the common line and other connection terminals on the display panel using the same connecting material. . 3. A display panel having a peripheral edge portion, and a plurality of display panel driving elements for driving the display panel, each of which is arranged in the peripheral edge portion of the display panel along an arrangement direction along the peripheral edge portion. A mounting structure of a display device comprising a wiring board, wherein the plurality of wiring boards include an insulating board and at least a plurality of connection terminals near both ends in the arrangement direction near each end of each wiring board. The display panel is provided with a plurality of wirings on the peripheral portion, the bypass wirings being partially electrically connected to each other near the both ends and electrically connected to the driving circuit element. A plurality of first common lines that are commonly connected to the connection terminals of the respective boards and are formed over a range including an array range of the plurality of wiring boards, and the plurality of wiring boards on the peripheral portion. Part of the connection terminal A plurality of second common lines that are commonly connected and are formed over a range including an arrangement range of a plurality of wiring boards are provided, and the connection terminals of each of the plurality of wiring boards are the first terminals on the display panel. A mounting structure of a display device in which the common line, the second common line, and other connection terminals are connected using the same conductive connecting material. 4. The display according to claim 1, wherein the bypass wiring includes a first bypass wiring which is formed on the insulating substrate and which directly connects the connection terminals near the both ends to each other. Device mounting structure. 5. The second bypass wiring formed on the insulating substrate in a range extending from the vicinity of one of the ends to the driving circuit element, and the other of the both ends of the bypass wiring. A third bypass wiring formed on the insulating substrate in a range extending from the vicinity of the end portion to the driving circuit element and both ends of the third bypass wiring formed in the driving circuit element, the both ends being the second bypass wiring and the third bypass wiring, respectively. The display device mounting structure according to any one of claims 1 to 3, further comprising an in-element bypass wiring connected thereto. 6. The mounting structure for a display device according to claim 1, wherein the bypass wiring is provided on both surfaces of the insulating substrate in each wiring board. 7. The mounting of the display device according to claim 4, wherein the first bypass wiring is provided on the insulating substrate at a position passing between the insulating substrate and the driving circuit element. Construction. 8. The mounting structure for a display device according to claim 1, wherein the connecting material is an anisotropic conductive film. 9. The display panel includes a pair of light-transmissive display substrates each having a display electrode provided on surfaces thereof facing each other, and at least one of the pair of display substrates is provided. 4. The common line according to claim 1, wherein the common line is provided in the remaining overlapping area other than the installation area of the display electrode and the peripheral portion in the area overlapping the display substrate facing the display substrate. The mounting structure of the display device according to Crab. 10. A plurality of wiring boards, each mounting a driving circuit element of the display panel, are aligned with the peripheral portion of a display panel having a peripheral portion, and a signal of the wiring board is connected through a connecting material. A method of mounting a display panel, wherein an input terminal, a bypass signal input terminal, and a signal output terminal to the display panel are collectively connected to the display panel and the wiring board.