JPH11149083A - Liquid crystal display device and manufacturing method thereof - Google Patents

Abstract

(57) [Problem] To form a liquid crystal cell and a liquid crystal layer in a liquid crystal display device having a large screen by bonding a connection substrate including a plurality of small substrates to a large substrate and bonding them together. The present invention provides a liquid crystal display device capable of avoiding the problem of adversely affecting display quality caused by the above, and realizing improvement of production efficiency and reduction of production cost, and a method of manufacturing the same. SOLUTION: Two or more internal pressure adjusting holes 9 are provided in a CF substrate 1. These internal pressure adjusting holes 9 are provided between the CF substrate 1 and the TF.
In a liquid crystal cell in which the T substrates 2a and 2b are bonded to each other with the sealing member 3 facing each other, the liquid crystal cells are provided so as to be located at positions farthest from each other. The cell gap is set and the liquid crystal material is injected by adjusting the pressure in the liquid crystal cell using these internal pressure adjusting holes 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to audio-visual (AV) equipment and office automation (OA).
Regarding a direct-view type liquid crystal display device that can be used for equipment,
The present invention relates to a liquid crystal display device having a large screen and a high display quality by combining an active matrix substrate, and a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, for display devices used in audiovisual equipment and office automation equipment, weight reduction, thinning, low power consumption, high definition, and large display screen (hereinafter referred to as "large") have been proposed. , Large screen)
Is required. Among them, especially for large screens, liquid crystal display (LCD), plasma display (PDP), CRT (Cathode Ray Tube) system, etc.
Various display devices such as an electroluminescence (EL) display device and a light emitting diode (LED) display device are being developed and put to practical use.

[0003] Among them, liquid crystal display devices have the advantages of being significantly thinner (depth) than other display devices, low power consumption, and being easy to be full-colored. It is used in the field, and there is great expectation for a large screen.

However, when the size of the liquid crystal display device is increased, a defective rate caused by a disconnection of a signal line or the like or a defect of a pixel rapidly increases in a manufacturing process. In addition to this, the large screen makes the manufacturing process complicated, and as a result,
There is a problem that the price of the liquid crystal display increases.

Therefore, in order to solve the above problems,
A liquid crystal display device for connecting a plurality of small substrates to each other to increase the screen size has been proposed. Specifically, in the liquid crystal display device having a large screen, at least one substrate of a pair of electrodes with electrodes constituting the liquid crystal display device connects a plurality of small substrates to each other on a side surface thereof. In the form of a single large connection substrate.

In particular, in the case of an active matrix type liquid crystal display device, it is extremely difficult to manufacture an active matrix substrate, which is a substrate on which fine active elements are formed for each pixel, with a large area and a high yield. Therefore, this active matrix substrate is used as a connection substrate that connects a plurality of small substrates. As described above, by using the active matrix substrate, which is difficult to increase in size, as the connection substrate, the efficiency of the liquid crystal display device having a larger screen can be improved in terms of production.

As a liquid crystal display device using the above-described connection substrate, for example, a liquid crystal display device disclosed in Japanese Patent Application Laid-Open No. H8-184849 and a method for manufacturing the same can be mentioned.

As shown in FIGS. 9 (a) and 9 (b), the liquid crystal display device disclosed in Japanese Patent Application Laid-Open No. H8-184849 has four small substrates 61a connected in a "-" shape to form a single substrate. Large substrate 6
The large substrate 61 and the counter substrate 62 are bonded together via a liquid crystal layer 64 sealed by a sealing material 63. In this liquid crystal display device, the small substrate 6
A gap support member 66 is provided between the connection portion 1a and the non-light-transmitting pattern 65 formed on the counter substrate.

The supporting member 66 is composed of small substrates 61a and 61
a is formed between a connection portion where the a is connected by an adhesive 67 and a non-light-transmitting pattern 65 facing the connection portion. Therefore, the small substrates 61a, 61a
It is possible to avoid the adverse effect on the display screen due to the step between them, and it is also possible to avoid a decrease in the non-defective product rate, thereby improving the productivity.

Further, as shown in FIGS. 10 (a) and 10 (b), the small substrates 71a and 71a are independently formed on the opposing substrate 72 by a sealing material 73 made of the same resist having the same pressure resistance. The present inventors have also proposed a liquid crystal display device having a configuration in which the substrates are bonded by the spacer 74. In this liquid crystal display device, the cell gap of the liquid crystal layer having a large area can be maintained at a constant value as a whole.

The connecting portion 77 of the small substrates 71a, 71a
Is filled with an adhesive 77a, and the liquid crystal layer 76
It is separated by the connecting portion 77 and is formed independently for each small substrate 71a. The sealing material 73 and the spacer 7
4 is formed so as to fit within the region of the BM 75 on the counter substrate 72. Therefore, the sealing material 7 of the connection portion 77
3 and the spacers 74 do not protrude into the area of the pixels 78, and the aperture ratio of the pixel electrodes 78a is improved, so that a high-quality display can be realized without adversely affecting the display of the liquid crystal display device. it can.

[0012]

However, in the liquid crystal display device and the method of manufacturing the same as described in Japanese Patent Application Laid-Open No. H8-184849, the following (1) And (2).

(1) In the liquid crystal display device as described above, the liquid crystal layer is formed by reducing the pressure in a liquid crystal cell obtained by bonding a small substrate and a counter substrate to each other with a sealant and then sealing the liquid crystal cell. It is performed by immersing in a tank filled with liquid crystal. However, when this method is used for a liquid crystal display device having a large screen, it is necessary to evacuate the liquid crystal cell for a long time. In addition, it takes a very long time to fill the entire liquid crystal cell with liquid crystal.

(2) In the liquid crystal display device as described above, for example, as shown in FIG. 11A, when the thicknesses of a plurality of (two in this case) small substrates 81a and 81b are slightly different. There is. At this time, as shown in FIG. 11B, after the opposing substrate 82 and the small substrates 81a and 81b are opposed to each other, the substrates are pressed (pressed) by a press plate 84, and the substrates are bonded to each other with a sealing material 83. In this case, the small substrate 81a having a small thickness is not sufficiently pressed.

In this case, as shown in FIG. 11C, a liquid crystal cell 8 formed of a small substrate 81a and a counter substrate 82 is formed.
In the case of 5a, the cell thickness, that is, the cell gap becomes larger than that of the liquid crystal cell 85b formed by the small substrate 81b and the counter substrate 82. That is, the central connecting portion 86
, The right and left cell gaps are different in the vicinity of the connection portion 86.

Therefore, after filling the gap between the connecting portions 86 with a translucent adhesive 87 (FIG. 11D), liquid crystal is injected into the liquid crystal cells 85a and 85b, and the liquid crystal layers 88a and 88b are filled.
8b (FIG. 11 (e)), the connecting portion 8 is formed.
The color is different under crossed Nicols between the left and right around 6, and the position of the connection portion 86 is immediately known to a viewer of the liquid crystal display device. That is, in the display of the liquid crystal display device, the joint of the connection portion 86 becomes conspicuous, and the display quality is reduced.

As described above, in the conventional liquid crystal display device, since each of the problems (1) and (2) has occurred,
Enlarging the screen of a liquid crystal display device while maintaining high display quality and realizing efficient manufacturing is still insufficient.

The present invention has been made in view of the above problems, and an object thereof is to provide a liquid crystal display device, in particular, by bonding a connection substrate composed of a plurality of small substrates to a large substrate so as to face each other. In a liquid crystal display device having a screen, while avoiding the occurrence of a problem that adversely affects display quality when forming a liquid crystal cell and a liquid crystal layer,
An object of the present invention is to provide a liquid crystal display device capable of improving production efficiency and lowering production cost, and a method of manufacturing the same.

[0019]

According to a first aspect of the present invention, there is provided a liquid crystal display device comprising: a liquid crystal cell formed by bonding a pair of substrates facing each other with at least a sealing material; A liquid crystal display device having a liquid crystal cell filled with a liquid crystal material is characterized in that one of the pair of substrates is provided with a plurality of openings for adjusting the pressure in the liquid crystal cell.

According to the structure of the first aspect, since the opening is provided in the substrate, the pressure in the liquid crystal cell can be easily adjusted. Therefore, by using this opening to depressurize the inside of the liquid crystal cell and press (press) it at atmospheric pressure, a uniform cell gap can be easily set. Further, the liquid crystal material can be easily filled with the liquid crystal material by injecting the liquid crystal material by adjusting the pressure in the liquid crystal cell using the opening.

According to the liquid crystal display device of the present invention,
In order to solve the above-described problem, in addition to the configuration described in claim 1, the opening is provided so as to be located at a position farthest from each other in the liquid crystal cell.

According to the second aspect of the present invention, since the opening is provided as described above, it is possible to satisfactorily adjust the pressure in the entire liquid crystal cell. for that reason,
By reducing the pressure inside the liquid crystal cell using these openings,
The cell gap of the entire liquid crystal cell can be set more uniformly. In addition, by adjusting the pressure in the liquid crystal cell using the opening and injecting the liquid crystal material, the entire liquid crystal cell can be sufficiently filled with the liquid crystal material.

According to a third aspect of the present invention, there is provided a liquid crystal display device comprising:
In order to solve the above problem, in addition to the configuration described in claim 1 or 2, the opening is provided in a non-display portion of a display screen of a liquid crystal display device.

According to the third aspect of the present invention, since the opening is provided in the non-display portion, the pressure in the entire liquid crystal cell can be improved without deteriorating the display quality of the obtained liquid crystal display device. Can be adjusted.

A liquid crystal display device according to a fourth aspect of the present invention comprises:
In order to solve the above-mentioned problem, in addition to the configuration according to claim 1, 2 or 3, one of the pair of substrates includes a plurality of small substrates adjacent to each other on a side surface thereof. Is characterized in that it is a connection substrate.

According to the configuration of the fourth aspect, the liquid crystal display device has a large screen by arranging a plurality of small substrates adjacent to each other on a side surface thereof to form a single connection substrate. At this time, since the cell gap is set by adjusting the pressure in the liquid crystal cell at the opening, the thickness of the plurality of small substrates differs in such a large-screen liquid crystal display device. Even in such a case, the cell gap can be set to a uniform value as a whole.

Further, by adjusting the pressure in the liquid crystal cell at the opening, the liquid crystal material is injected into the liquid crystal cell. Therefore, as in the liquid crystal display device having a large screen,
Even if the liquid crystal layer is very large, the liquid crystal material can be quickly and satisfactorily injected and filled.

Therefore, the liquid crystal display device having the above-described structure can be a large-screen liquid crystal display device capable of improving manufacturing efficiency and maintaining high display quality.

According to a fifth aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device, wherein a liquid crystal cell is formed by bonding a pair of substrates facing each other with at least a sealing material. After setting the cell gap of the cell, in a method of manufacturing a liquid crystal display device in which a liquid crystal material is injected into the liquid crystal cell to form a liquid crystal layer, a substrate having a plurality of openings in one of the pair of substrates is used. Adjusting the pressure in the liquid crystal cell from the plurality of openings to set the cell gap by pressing each of the substrates at atmospheric pressure, and adjusting the pressure in the liquid crystal cell from the plurality of openings. Accordingly, the method includes a step of injecting a liquid crystal material and a step of sealing the opening after the injection of the liquid crystal material.

According to the method of the fifth aspect, by using the substrate provided with the plurality of openings, the pressure in the liquid crystal cell can be easily adjusted in the process of manufacturing the liquid crystal display device. . Therefore, by reducing the pressure in the liquid crystal cell, it becomes possible to press each of the above-mentioned substrates by the atmospheric pressure, and it is possible to easily set a uniform cell gap. In addition, by appropriately adjusting the pressure in the liquid crystal cell, the liquid crystal material can be easily injected. Further, if it is no longer necessary to adjust the pressure in the liquid crystal cell, the opening is sealed, so that it is possible to avoid lowering the quality of the obtained liquid crystal display device.

In addition, the setting of the cell gap and the injection of the liquid crystal material do not need to be performed in separate facilities as in the prior art, but can be performed in substantially the same facility. Therefore, the manufacturing process of the liquid crystal display device can be made more efficient, and the manufacturing cost can be reduced.

According to a sixth aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device according to the fifth aspect.
In addition to the configuration described above, the liquid crystal material is injected by reducing the pressure inside the liquid crystal cell from one of the plurality of openings and supplying the liquid crystal material from the other while pressurizing the liquid crystal material.

According to the method of the sixth aspect, the inside of the liquid crystal cell is depressurized from one of the plurality of openings and the liquid crystal material is supplied while being pressurized from the other. This means that the replacement with the liquid crystal material is performed smoothly. Therefore, the liquid crystal material can be injected and filled in a shorter time and better than in the conventional case.

According to a seventh aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device according to the fifth aspect.
Or in addition to the configuration described in 6, the one substrate of the pair of substrates may be a connection substrate formed by adjoining a plurality of small substrates on side surfaces thereof, and the plurality of small substrates may be connected to the other substrate. And bonding the small substrates to each other to form a liquid crystal cell for each small substrate, and setting the cell gap for the plurality of liquid crystal cells under the same conditions.

According to the above-described method, even when the liquid crystal cell is formed for each small substrate, the cell gap of the entire liquid crystal display device can be made uniform. Further, even in the case where the thicknesses of the small substrates are different from each other, the non-uniformity of the cell gap which is particularly remarkable at the connection portion between the small substrates can be eliminated. Therefore, the liquid crystal display device having a large screen can be manufactured efficiently and at low cost without lowering the quality.

[0036]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.
Note that the present invention is not limited by this.
As shown in FIGS. 1 and 2, the liquid crystal display device of the present embodiment has a single large substrate (hereinafter, referred to as a CF substrate) 1
And a single connection substrate 2 in which two active matrix substrates (hereinafter, referred to as TFT substrates) 2a and 2b as small substrates using TFTs as active elements are connected on the side surfaces thereof, a sealing material 3 and a spacer 4 And TFT substrate 2
The connection is made by the adhesive 5 at the connection portion 10 of a.2b.

The TFT substrates 2a and 2b and the CF substrate 1 are attached to each other along the peripheral portions of the TFT substrates 2a and 2b by a sealing material 3 and a spacer 4. For this reason, the sealing material 3
This means that the FT substrates 2a and 2b are independently attached to each other. Therefore, the liquid crystal layer 14 is individually sandwiched between the TFT substrates 2a and 2b and the CF substrate 1, as shown in FIG.

In other words, the liquid crystal cell 8a is formed by bonding the TFT substrate 2a and the CF substrate 1, which are a pair of substrates facing each other, with the sealing material 3 and the spacer 4. On the other hand, the liquid crystal cell 8b is formed by bonding the TFT substrate 2b and the CF substrate 1, which are a pair of substrates facing each other, with the sealing material 3 and the spacer 4.

The liquid crystal cells 8a and 8b respectively have
At least two internal pressure adjusting holes (openings) 9 for communicating the inside of the liquid crystal cells 8a and 8b with the outside are formed. As shown in FIG. 1, these internal pressure adjusting holes 9 are preferably located at a position that is a non-display region outside the display region of the obtained liquid crystal display device and at a position that is within a region surrounded by the seal material 3. They are formed so as to be separated from each other. The internal pressure adjusting hole 9 will be described later.

The sealing material 3 and the spacer 4 are shown in FIG.
As shown in FIG. The spacer 4 and the sealing material 3 in the connection portion 10 are formed so as to be contained in a region of a black matrix (hereinafter, referred to as BM) 12 which is a non-light-transmitting pattern formed on the CF substrate 1. I have.

The sealing material 3 and the spacer 4 are made of a resist having pressure resistance and adhesiveness. Note that this resist can provide the sealant 3 and the spacer 4 with adhesiveness by forming an adhesive layer on the resist even if the resist itself does not have adhesiveness. .

The sealing material 3 and the spacer 4 are collectively formed in one step using a photomask. The pattern of the spacer 4 at this time is not particularly limited as long as it fits within the area of the BM 12 and does not affect the display, but the spacer per unit pixel area is provided for each of the TFT substrates 2a and 2b. 4 must be formed so that their occupied areas are substantially the same.

This is because, by connecting the TFT substrates 2a and 2b, in the liquid crystal cells 8a and 8b having a larger area than usual, the cell gap is maintained uniformly as a whole, and This is for the purpose of strengthening the structure in which the substrate and the CF substrate 1 are bonded together.

The pattern of the spacer 4 is shown in FIG.
As shown in FIG. 7, the columnar resist layer
An island-shaped pattern formed at regular intervals in the region of M12 can be exemplified. Also,
The pattern of the spacer 4 may be a linear pattern along the BM 12 with a line width that fits within the area of the BM 12.

The pixel 6 includes three pixel electrodes 7 corresponding to red (R), green (G), and blue (B) color filters formed on the TFT substrates 2a and 2b. Further, a connection portion (hereinafter simply referred to as a connection portion) 10 between the TFT substrates 2a and 2b is filled with an adhesive 5 which is a resin having substantially the same refractive index as the substrate material of the TFT substrates 2a and 2b. . Then, a layer made of the sealing material 3 is formed so as to contact both sides of the layer made of the adhesive 5.
The adhesive 5 is formed so as to connect the two TFT substrates 2 a and 2 b on the side surfaces thereof and also to contact the CF substrate 1.

That is, two TFT substrates 2a and 2b and C
The F substrate 1 includes, in addition to the sealing material 3 and the spacer 4,
At the connection part 10, it is also bonded by the adhesive 5. At this time, as shown in FIGS. 2 and 3, the layer of the adhesive 5 and the layer of the sealing material 3 in the connection portion 10 are the BM on the CF substrate 1 facing the connection portion 10.
It is formed so as to be a gap that fits within the region of No. 12. In FIG. 3, for convenience of explanation, the interval (pixel pitch) between the adjacent pixels 7 with the connection portion 10 interposed therebetween is larger than the other pixel pitches.
The pixel pitch is the same as other pixel pitches so as to make the seams of 0 inconspicuous.

As the TFT substrates 2a and 2b, for example, glass substrates made of non-alkali glass (such as Corning 7059) can be used. In the present embodiment, two TFT substrates 2a and 2b are used as the above-mentioned TFT substrate. However, in the connection portion 10 between the TFT substrates 2a and 2b, the above-described layer made of the sealing material 3 is used. Three or more sheets may be used as long as they are connected by forming a layer made of the adhesive 5. For example, one connection substrate 2 may be formed by connecting four TFT substrates 2a and 2b in a "" shape.

As the adhesive 5, the TFT substrate 2a
It is preferable to use a transparent material having a refractive index substantially equal to that of the glass substrate used for 2b. Specifically, an ultraviolet curable adhesive is often used. As the ultraviolet curable adhesive, one having a refractive index substantially equal to that of the glass substrate used for the TFT substrate 2a (the refractive index is 1.53 in the case of Corning 7059) can be easily obtained.

For this reason, in the gap between the two TFT substrates 2a and 2b, refraction and scattering of light can be prevented, and adverse effects on the display screen due to coloring of light transmitted through the connection portion 10 can be avoided. . In addition, since heat is not required at the time of curing, adverse effects of heat on the TFT substrates 2a and 2b and the CF substrate 1 can be avoided.

The internal pressure adjusting holes 9 are provided in the liquid crystal cells 8a and 8b.
Are formed as a plurality of openings in at least one of the TFT substrates 2a and 2b and the CF substrate 1. The internal pressure adjusting hole 9 is for adjusting the pressure in the liquid crystal cells 8a and 8b, and is provided in each of the liquid crystal cells 8a and 8b so that the inside and the outside communicate with each other.

In this embodiment, FIG. 1 and FIG.
As shown in (2), two internal pressure adjusting holes 9 are provided in the CF substrate 1 for each of the liquid crystal cells 8a and 8b. These two internal pressure adjusting holes 9.9 are used to transfer the liquid crystal material to the liquid crystal cell 8a.
In order to sufficiently fill the entire 8b, the two internal pressure adjusting holes 9.9 are provided so as to be as far away from each other as possible.

More specifically, the internal pressure adjusting holes 9 are provided so as to be separated from each other by at least one side of the liquid crystal cells 8a and 8b. For example, the position at which the internal pressure adjusting holes 9 are provided is, as shown in FIGS. 1 and 4A, in each liquid crystal cell 8a, 8b in a region surrounded by the sealing material 3, and A region outside the display unit 11 to be a non-display unit further includes rectangular liquid crystal cells 8a and 8b.
At both ends of the diagonal line.

Alternatively, as shown in FIG. 4B, in each of the liquid crystal cells 8a and 8b, the liquid crystal cells 8a and 8b are in a region surrounded by the sealing material 3 and also as a non-display portion outside the display unit 11. A certain point is similar to the case of FIG. 4A, but may be positions at both ends of the sides in the longitudinal direction of the rectangular liquid crystal cells 8a and 8b. Here, the number of the internal pressure adjusting holes 9 is not limited to two, but may be three or more.

The liquid crystal display device shown in FIGS. 4A and 4B and FIG. 5 to be described later is viewed from the CF substrate 1 side, and is similar to the liquid crystal display device shown in FIG. It is not viewed from the side of 2a and 2b.

The distance between the internal pressure adjusting holes 9 is not particularly limited as long as it is longer than one side of the liquid crystal cells 8a and 8b. However, the liquid crystal cell 8a
In the case where 8b has a rectangular shape as shown in FIGS. 1 and 4A and 4B, it is particularly preferable that the length is equal to or longer than one side in the longitudinal direction.

If the distance between the internal pressure adjusting holes 9 is too small, it is not possible to satisfactorily adjust the pressure in the entire liquid crystal cells 8a and 8b. Therefore, the internal pressure adjusting holes 9
9, the setting of the cell gap and the injection of the liquid crystal material, which will be described later, cannot be performed satisfactorily. Therefore, it is preferable that the distance between the internal pressure adjusting holes 9 is as large as possible. When the liquid crystal cells 8a and 8b are rectangular, as shown in FIGS. It is particularly preferable that the positions where the adjusting holes 9 are formed are located at both ends of the diagonal line, that is, at the positions farthest from each other in the liquid crystal cell.

The internal pressure adjusting holes 9 are provided in the liquid crystal cells 8a and 8a.
Since it is for adjusting the pressure in b, it is formed inside the region surrounded by the sealing material 3. However, even inside the region surrounded by the sealing material 3,
When the liquid crystal display device is provided at a position to be the display unit 11, the display quality of the obtained liquid crystal display device is degraded. for that reason,
The internal pressure adjusting hole 9 is preferably provided in a region serving as a non-display portion on the display screen.

The position to be the non-display portion is shown in FIG.
As shown in (a) and (b), an area on the outer periphery of the display unit 11, which is a range in which an image is displayed, can be given. Further, even in the display unit 11, an area in which an image is not displayed by the BM 12 or the like may be used. By providing the internal pressure adjusting hole 9 in such a region serving as the non-display portion, it is possible to satisfactorily adjust the pressure in the entire liquid crystal cells 8a and 8b without lowering the display quality of the obtained liquid crystal display device. .

The shape of the internal pressure adjusting hole 9 is not particularly limited as long as the internal pressure adjusting hole 9 is formed as an opening communicating the inside of the liquid crystal cells 8a and 8b with the outside. For example, as shown in FIG. 5, an internal pressure adjusting hole 19 provided as an opening composed of two holes may be used. Also in this case, the distance between the two internal pressure adjusting holes 19 is equal to or longer than one side of the liquid crystal cells 8a and 8b.

The substrate on which the internal pressure adjusting holes 9 are provided is a CF substrate 1 of a pair of substrates constituting a liquid crystal cell.
Side is preferred. This is because the TFT substrates 2a and 2
When the internal pressure adjusting hole 9 is provided on the side b, the TFT substrates 2a and 2b
The internal pressure adjusting hole 9 is provided on the wiring such as the signal line provided thereon.
This is not preferable because the wiring is affected. Note that the internal pressure adjusting holes 9 may be provided on the TFT substrates 2a and 2b as long as they can be provided so as not to affect the wiring.

In addition, the internal pressure adjusting hole 9 is provided with the liquid crystal cell 8a.
If the pressure inside 8b does not need to be adjusted, it is sealed with an ultraviolet curable resin or a two-component reactive curable resin. Here, the adjustment of the pressure in the liquid crystal cells 8a and 8b is performed during the manufacturing process of the liquid crystal display device. Therefore, when the liquid crystal display device is completed, the internal pressure adjusting hole 9 is formed, for example, by an ultraviolet curable resin. (UV light) for sealing.

The provision of the internal pressure adjusting hole 9 having the above-described configuration makes it possible to satisfactorily adjust the pressure in the entire liquid crystal cells 8a and 8b. Therefore, the pressure inside the liquid crystal cells 8a and 8b is reduced by using the internal pressure adjusting holes 9, so that the CF substrate 1 and the TFT substrate 2a.
2b can be pressed at atmospheric pressure.

When the above substrates are pressed with each other under the atmospheric pressure, the entire surfaces of the CF substrate 1 and the connection substrate 2 can be pressed uniformly. Therefore, the cell gap, which is the width of the gap between the substrates, can be set to be more uniform than before. In particular, as shown in FIG. 2, even when the thicknesses of the TFT substrates 2a and 2b constituting the connection substrate 2 are different, the cell gap can be set uniformly.

Further, by appropriately adjusting the pressure in the liquid crystal cells 8a and 8b using the internal pressure adjusting holes 9.9, it is possible to easily and satisfactorily fill the entire liquid crystal cells 8a and 8b with the liquid crystal material. Become.

The method of manufacturing a liquid crystal display device according to the present invention including the above-described cell gap setting step and liquid crystal material injecting step will be described in more detail with reference to FIGS. 6 to 8, but is not limited thereto. Not something. FIGS. 6 and 7A show a method of manufacturing a liquid crystal display device according to the present invention.
As shown in (e), it has the following six basic steps.

First, as a first step in FIG. 6 (process 1; hereinafter, the process is abbreviated as P), as shown in FIG. 7A, photo-curing is performed on the CF substrate 1 or the TFT substrates 2a and 2b. 3 and spacer 4 made of conductive resist
Are formed using a photomask. The types of the sealing material 3 and the spacer 4 are not limited to these. The CF substrate 1 has a liquid crystal cell 8a
The two internal pressure adjusting holes 9 are formed in the area 8b.

Next, as a second step (P2) in FIG. 6, although not shown in FIGS. 7 (a) to 7 (e), polyimide or the like is formed on the respective opposing surfaces of the CF substrate 1 and the TFT substrates 2a and 2b. A rubbing treatment is performed after forming an alignment film composed of

Thereafter, the third step (P3) in FIG.
As shown in FIG. 7B, the TFT substrates 2a and 2
The TFT substrates 2a and 2b are aligned with the CF substrate 1 so as to form a single connection substrate (connection substrate 2 in FIG. 2) with the side surfaces b adjacent to each other. At this time, the sealing material 3 and the spacer 4
Thus, the CF substrate 1 and the TFT substrates 2a and 2b are temporarily fixed.

By temporarily fixing the CF substrate 1 and the TFT substrates 2a and 2b, liquid crystal cells 8a and 8b are formed respectively. Since the sealing material 3 and the spacer 4 are in a pre-cured state where they are not fully cured, they have appropriate flexibility and adhesiveness.

Next, as a fourth step (P4) in FIG. 6, as shown in FIG. 7 (c), the pressure is reduced in the internal pressure adjusting holes 9.9 provided two for each of the liquid crystal cells 8a and 8b. The liquid crystal cells 8a and 8 in FIG.
The pressure inside b is reduced. As a result, the liquid crystal cells 8a and 8b are pressed at atmospheric pressure, and each substrate (CF substrate 1 and TFT) is pressed.
The substrates 2a and 2b are bonded together, and the liquid crystal cell 8
The cell gap of a · 8b is set.

Here, the sealing material 3 and the spacer 4
Is thermoplastic, for example, the liquid crystal cell 8
The pressure is reduced while heating a.8b in an oven, the substrates are bonded together, and the cell gap is set. The state of the cell gap setting step can be changed as appropriate depending on the material of the sealing material 3 and the spacer 4.

After the setting of the cell gaps of the liquid crystal cells 8a and 8b is completed, as shown in FIG. 7D, the connection of the TFT substrates 2a and 2b is performed as a fifth step (P5) in FIG. A transparent adhesive 5 having a refractive index substantially equal to that of the TFT substrates 2a and 2b is provided in a gap in the portion 10.
Fill. At this time, in the connection portion 10, as shown in FIGS. 2 and 3, the layer of the adhesive 5 and the layer of the sealing material 3 in the connection portion 10 are in the BM 12 which is a non-display portion between the pixels 6. It fits in.

Next, as a sixth step (P6) in FIG. 6, as shown in FIG. 7 (e), one of the pressure reducing lines 15, 15 connected to the internal pressure adjusting holes 9, 9 is removed. , The liquid crystal supply line 16 which is also a pressure line. Then, a liquid crystal material is injected while pressurizing the insides of the liquid crystal cells 8a and 8b.

Finally, the seventh step (P7) in FIG.
Then, the internal pressure adjusting holes 9 are sealed with an ultraviolet curable resin or a two-component reactive curable resin. Thus, the liquid crystal display device is completed.

Next, the steps P3 to P7 will be described in more detail with reference to FIGS. 8 (a) to 8 (d).

Although not explicitly shown in FIGS. 7A to 7E, when the thickness of the TFT substrate 2a is different from the thickness of the TFT substrate 2b as shown in FIG. In the aligned state, a step is formed on the surface on the side of the TFT substrates 2a and 2b. Here, TF
It is assumed that the T substrate 2a is thinner than the TFT substrate 2b.

In this state, when the liquid crystal cells 8a and 8b are pressed by using a pressing plate as in the prior art, since there are steps on the surface of the TFT substrates 2a and 2b, the connection substrate 2
The whole is not pressed uniformly, and in the vicinity of the connection portion 10,
The cell gaps of the liquid crystal cells 8a and 8b are different.
Therefore, the color of the display is different for each of the TFT substrates 2a and 2b in the vicinity of the connection part 10, and the joint of the connection part 10 becomes conspicuous.

However, in the method of manufacturing a liquid crystal display device according to the present invention, by connecting the pressure reducing lines 15 to the internal pressure adjusting holes 9 to reduce the pressure in the liquid crystal cells 8a and 8b in P4. TFT substrates 2a and 2b and CF
The substrate 1 is pressed at atmospheric pressure. In addition, since the cell gaps of the liquid crystal cells 8a and 8b are set under the same conditions, the cell gaps of the liquid crystal cells 8a and 8b that are different for each of the TFT substrates 2a and 2b must be set more uniformly as a whole. Can be.

For this reason, as shown in FIG.
Even if the thicknesses of the T substrate 2a and the TFT substrate 2b are different, the connection substrate 2 (TFT substrate 2a and T
The entire FT substrate 2b) is pressed uniformly. therefore,
The cell gaps of the liquid crystal cells 8a and 8b become the same.

Thereafter, the adhesive 5 is filled into the gap between the connecting portions 10 at P5, and the liquid crystal material is injected into the liquid crystal cells 8a and 8b at P6, and the liquid crystal material is filled. In P4, since the cell gap can be set uniformly, the color tone on the display becomes almost the same in any of the liquid crystal cells 8a and 8b in the vicinity of the connection portion 10. Therefore, the joints of the connection portions 10 are hardly conspicuous on the display, and the TFT substrate 2a
-The joint of 2b becomes very difficult to recognize.

In the step of injecting the liquid crystal material at P6,
As shown in FIG. 8C, a liquid crystal material is injected by connecting a liquid crystal supply line 16 to one of the internal pressure adjusting holes 9. At this time, as described above, the internal pressure adjusting holes 9 are formed.
The pressure reducing line 15 is connected to the other one of 9.

For this reason, in the liquid crystal cells 8 a and 8 b, the inside is evacuated from one of the internal pressure adjusting holes 9 by the decompression line 15, but the liquid crystal material from the arrow A is drawn from the other internal pressure adjusting hole 9. And the liquid crystal cell 8a from the arrow B
8b is applied simultaneously. In other words, in the liquid crystal cells 8a and 8b, the exchange between the air and the liquid crystal material is performed smoothly. Therefore, it is possible to inject and fill the liquid crystal material in a short time and well.

Here, in the conventional method of manufacturing a liquid crystal display device, a liquid crystal cell provided with an opening in a pattern of a sealing material is used.
The liquid crystal material was injected by being immersed in a tank filled with the liquid crystal material. In this method, it is difficult for the liquid crystal material to smoothly penetrate into the liquid crystal cell because the air in the liquid crystal cell is hardly released to the outside.

On the other hand, in the manufacturing method of the liquid crystal display device according to the present invention, the pressure in the liquid crystal cells 8a and 8b is adjusted by using the internal pressure adjusting holes 9 and 9 so that the liquid crystal cell 8 is adjusted.
The exchange of the air in a.8b with the liquid crystal material is smoothly performed. Therefore, the liquid crystal material is quickly injected. In addition, there are at least two internal pressure adjusting holes 9, and these internal pressure adjusting holes 9 are mutually connected to the liquid crystal cells 8a and 8b.
It is provided so as to be located as far away as possible in the inside. Therefore, the pressure is not adjusted only in the vicinity of the internal pressure adjusting hole 9, and the entire liquid crystal cells 8a and 8b can be satisfactorily filled with the liquid crystal material.

After the filling of the liquid crystal material is completed, as a final step P7, as shown in FIG. 8D, the internal pressure adjusting holes 9.9 are filled with an ultraviolet curable resin or a two-component reactive curable resin. Seal. Here, since the internal pressure adjusting holes 9 are provided in a non-display area on the display screen, they do not adversely affect the display of an image. Therefore, the obtained liquid crystal display device, that is, the liquid crystal display device according to the present invention can realize high display quality.

The TFT substrate 2a and the TFT substrate 2
As shown in FIG. 8D, due to the difference in thickness from
At the connection portion 10 of the FT substrates 2a and 2b, a slight step is generated on the display surface. However, this step does not adversely affect the display of an image, and if the cell gaps of the liquid crystal cells 8a and 8b are substantially the same, it is possible to avoid the joint of the connecting portion 10 from being noticeable.

As described above, the liquid crystal display device according to the present invention is provided with the above-described internal pressure adjusting holes (openings). Therefore, by using these internal pressure adjusting holes to depressurize the inside of the liquid crystal cell and press it at atmospheric pressure, the cell gap can be made uniform even if the thickness of the substrate constituting the liquid crystal cell is different. . In addition, by connecting a decompression line to one of the internal pressure adjusting holes and a liquid crystal supply line to the other, and injecting the liquid crystal material, the liquid crystal cell can be quickly and satisfactorily filled with the liquid crystal material.

In the method of manufacturing a liquid crystal display device according to the present invention, the step of setting the cell gap (bonding the substrates) and the step of injecting the liquid crystal material are performed by adjusting the pressure in the liquid crystal cell. Therefore, a liquid crystal display device can be manufactured more efficiently than before. In addition, since each of the above two steps can be performed with substantially the same equipment, the capital investment can be reduced, and the space for the manufacturing equipment can be saved in the factory of the liquid crystal display device.
As a result, the efficiency of manufacturing the liquid crystal display device can be increased, and the manufacturing cost can be reduced.

The configuration of the liquid crystal display device according to the present invention and the method of manufacturing the same are not limited to a liquid crystal display device having a large screen by connecting a plurality of small substrates. And a normal size liquid crystal display device comprising

In other words, since the setting of the cell gap and the injection of the liquid crystal material are performed by reducing the pressure inside the liquid crystal cell using the internal pressure adjusting holes, a plurality of small substrates are not connected to increase the screen size. With the liquid crystal display device described above, the manufacturing cost can be reduced and the manufacturing efficiency can be increased. At this time, although the shape of the spacer for maintaining the cell gap in the liquid crystal cell is not limited, it is preferable that the spacer is fixed to the liquid crystal cell.

As described above, the configuration of the liquid crystal display device and the method of manufacturing the same according to the present invention can be suitably used for liquid crystal display devices in general.

[0092]

EXAMPLE Next, a specific example of a method of manufacturing a liquid crystal display device according to the present invention will be described using a comparative example with reference to FIGS.

Embodiment 1 First, as shown in FIG. 7A, a UV-curable resist having a pressure resistance is applied on a CF substrate 1 on which at least CF, BM, and a common electrode (not shown) are formed. By exposing and developing using a photomask, the sealing material 3 and the spacer 4 were formed in one step. The sealing material 3 and the spacer 4 are in a pre-cured state by light (P1).

At this time, the pattern of the sealing material 3 corresponds to the shape of the two TFT substrates 2a and 2b. Also,
The pattern of the spacer 4 is the B pattern provided on the CF substrate 1.
A pattern corresponding to M was used.

Thereafter, the sealing material 3 and the spacer 4
Are applied to the surfaces of the CF substrate 1 on which is disposed and the TFT substrates 2a and 2b that are bonded to face each other, and rubbing treatment is performed after firing each of them (P2).

As shown in FIG. 7 (a) and FIG. 8 (a), the
The two TFT substrates 2a and 2b were arranged so as to face the CF substrate 1 on which the sealing material 3 and the spacer 4 were formed, and each was aligned according to the pattern of the sealing material 3 (P3). Here, the thickness of the TFT substrate 2a is smaller than the thickness of the TFT substrate 2b.

In the liquid crystal cells 8a and 8b formed by the aligned TFT substrates 2a and 2b and CF substrate 1, as shown in FIGS. 7C and 8B, two internal pressure adjusting holes 9 and 8 are formed. The pressure was reduced by connecting pressure reduction lines 15 to 9. Due to this reduced pressure, the TFT substrate 2a
2b and the CF substrate 1 are pressed under atmospheric pressure to set the cell gap of the liquid crystal layer 14 in the liquid crystal cells 8a and 8b to 5.
It was set to 0 μm (P4).

The internal pressure adjusting holes 9 are formed in the CF substrate 1 in this embodiment. As shown in FIG. 1 and FIG. 4 (a), these internal pressure adjusting holes 9
In each of the liquid crystal cells 8a and 8b, a region which is a region surrounded by the sealing material 3 and which is a non-display portion outside the display portion 11, and further, both ends of diagonal lines in the rectangular liquid crystal cells 8a and 8b It is provided at a position where

In this embodiment, since the resist is thermoplastic, the pressure is reduced while heating the liquid crystal cells 8a and 8b in an oven, and the substrates are bonded to each other. After the cell gap is set, the liquid crystal cells 8a and 8b are taken out of the oven, and the sealing material 3 made of a temporarily cured resist is removed.
The spacer 4 was completely cured to fix the set cell gap.

Subsequently, the TF bonded to the CF substrate 1
In order to connect the T substrates 2a and 2b, as shown in FIG. 7D, the gap between the TFT substrates 2a and 2b was filled with an ultraviolet curing adhesive 5 (P5).

Thereafter, as shown in FIGS. 7 (e) and 8 (c), one of the pressure reducing lines 15 connected to the internal pressure adjusting holes 9 is connected to a pressure line. However, the liquid crystal supply line 16 was replaced. Then, the pressure inside the liquid crystal cells 8a and 8b was reduced from one of the internal pressure adjusting holes 9 and the liquid crystal material was injected while the other was pressurized, thereby forming the liquid crystal layer 14 (P6). At this time, the size of the screen of the liquid crystal display device is equivalent to 25 inches.

Finally, as shown in FIG. 8D, the internal pressure adjusting holes 9.9 are sealed by filling the internal pressure adjusting holes 9.9 with an ultraviolet curable resin and irradiating ultraviolet rays to cure the resin. (P7). Thus, the liquid crystal display device of this example was manufactured.

Comparative Example First, as shown in FIG. 11A, a sealing material 83 and a spacer (not shown) were formed on a CF substrate 82 in the same manner as in the above embodiment. Here, a plurality of openings for injecting a liquid crystal material are provided in the pattern of the sealing material 83. Subsequent formation of the alignment film, alignment of the TFT substrates 81a and 81b, and formation steps of the liquid crystal cells 85a and 85b are the same as those in the above embodiment.

Next, as shown in FIGS. 11 (b) and 11 (c), the formed liquid crystal cells 85a and 85b are sandwiched between press jigs. 8
4 only) while pressing with CF substrate 82 and TFT substrate 8
1a and 81b were bonded together. At this time, as in the above embodiment, since the sealing material 83 and the spacer (not shown) are made of a thermoplastic resist, the liquid crystal cell 85a
The substrates were bonded together while heating 85b in an oven, and the cell gap was set to 5.0 μm.

Thereafter, as shown in FIG.
An adhesive 87 is filled in the connecting portion 86 of the T substrates 81a and 81b, and a liquid crystal material is injected by a conventional injection method.
As shown in (e), liquid crystal layers 88a and 88b were formed to manufacture a liquid crystal display device as a comparative example. In addition, also in the liquid crystal display device of this comparative example, the screen size is 25
It is equivalent to a type.

In the liquid crystal display device according to the present invention manufactured by the above-described embodiment, even if the thicknesses of the plurality of TFT substrates 2a and 2b are different, the internal pressure adjusting holes 9 are used.
By reducing the pressure in the liquid crystal cells 8a and 8b, it was possible to make the cell gap of the entire liquid crystal display device uniform.

On the other hand, in the liquid crystal display device of the comparative example, the TFT substrate 81a, which is the thinner one of the bonded TFT substrates 81a and 81b, was not sufficiently pressed in the pressing step. Therefore, in the liquid crystal cell 85a composed of the TFT substrate 81a and the liquid crystal cell 85b composed of the TFT substrate 81b, about 0.3 μm
Cell gap.

In the step of injecting the liquid crystal material, the liquid crystal display device of the comparative example using the conventional injection method also requires 25%.
In order to fill the entire liquid crystal cells 85a and 85b corresponding to the screen corresponding to the mold with liquid crystal, it was necessary to evacuate the inside for about 20 hours. On the other hand, in the liquid crystal display device of the example, it was possible to fill the entire liquid crystal cells 8a and 8b with liquid crystal in about four and a half hours.

Further, each of the liquid crystal display devices of the embodiment and the comparative example completed by filling the liquid crystal material is sandwiched between polarizing plates in a crossed Nicols state, and then an image is displayed. Was evaluated. In the liquid crystal display device of the embodiment, the joints of the connection portions 10 are not recognized by the viewer, and the entire liquid crystal cells 8a and 8b are sufficiently filled with the liquid crystal material. Was realized.

On the other hand, in the liquid crystal display device of the comparative example, as described above, a difference in cell gap of 0.3 μm occurred at the connection portion 86, so that the display color was slightly different near the connection portion 86. . In addition, because of the difference in color, the joint of the connecting portion 86 was conspicuous, and the display quality was clearly inferior to the liquid crystal display device of the example.

In addition, in the method of manufacturing the liquid crystal display device of the above embodiment, the pressing step and the liquid crystal material injecting step for the liquid crystal cells 8a and 8b can be performed by almost one facility, thereby simplifying the manufacturing process. It was also possible to reduce capital investment. Further, it was possible to save the installation place of the equipment in the factory.

As described above, in the liquid crystal display device of the present embodiment, a high quality liquid crystal display device having a large screen can be manufactured by a simple and efficient manufacturing method. In addition, since capital investment can be suppressed, manufacturing costs can be reduced.

[0113]

As described above, the liquid crystal display device according to the first aspect of the present invention forms a liquid crystal cell by bonding a pair of substrates facing each other with at least a sealing material, and forms a liquid crystal material in the liquid crystal cell. In a liquid crystal display device that is filled, one of the pair of substrates is provided with a plurality of openings for adjusting pressure in a liquid crystal cell.

Therefore, in the above configuration, since the opening is provided in the substrate, the pressure in the liquid crystal cell can be easily adjusted. Therefore, a uniform cell gap can be easily set by depressurizing the inside of the liquid crystal cell and pressing it at atmospheric pressure using the opening. In addition, by adjusting the pressure in the liquid crystal cell using the opening and injecting the liquid crystal material, the liquid crystal cell can be easily filled with the liquid crystal material.

A liquid crystal display device according to a second aspect of the present invention is
As described above, in addition to the configuration described in the first aspect, the opening is provided so as to be located at a position farthest from each other in the liquid crystal cell.

Therefore, in the above configuration, since the opening is provided as described above, it is possible to satisfactorily adjust the pressure in the entire liquid crystal cell. Therefore, by reducing the pressure inside the liquid crystal cell using this opening, the cell gap of the entire liquid crystal cell can be set more uniformly. Further, by adjusting the pressure in the liquid crystal cell using the opening and injecting the liquid crystal material, an effect that the entire liquid crystal cell can be sufficiently filled with the liquid crystal material can be obtained.

A liquid crystal display device according to a third aspect of the present invention is
As described above, in addition to the configuration described in claim 1 or 2, the opening is provided in a non-display portion of a display screen of a liquid crystal display device.

Therefore, in the above configuration, by providing the opening in the non-display portion, it is possible to satisfactorily adjust the pressure in the entire liquid crystal cell without deteriorating the display quality of the obtained liquid crystal display device. It has the effect of being able to.

The liquid crystal display device according to the fourth aspect of the present invention provides:
As described above, in addition to the configuration according to claim 1, 2 or 3, one of the pair of substrates is formed by connecting a plurality of small substrates with one connection substrate adjacent to the side surface of the small substrate. This is the configuration.

Therefore, in the above configuration, the steps of setting the cell gap and injecting the liquid crystal material can be performed easily and suitably, so that the production of a liquid crystal display device having a large screen can be made more efficient, and There is an effect that a large-screen liquid crystal display device which can maintain high display quality can be provided.

In the method for manufacturing a liquid crystal display device according to the fifth aspect of the present invention, as described above, a pair of substrates opposed to each other are bonded at least with a sealing material to form a liquid crystal cell.
After setting the cell gap of the liquid crystal cell, in a method of manufacturing a liquid crystal display device in which a liquid crystal material is injected into the liquid crystal cell to form a liquid crystal layer, a substrate having a plurality of openings in one of the pair of substrates is used. Adjusting the pressure in the liquid crystal cell from the plurality of openings to set the cell gap by pressing the substrates at atmospheric pressure, and reducing the pressure in the liquid crystal cell from the plurality of openings. The method includes a step of injecting a liquid crystal material by adjusting, and a step of sealing the opening after the injection of the liquid crystal material.

Therefore, in the above method, the pressure in the liquid crystal cell can be easily adjusted in the process of manufacturing the liquid crystal display device by using the substrate provided with the plurality of openings. Therefore, the setting of the cell gap and the injection of the liquid crystal material can be performed easily and efficiently. Therefore, there is an effect that the manufacturing process of the liquid crystal display device can be made more efficient and the manufacturing cost can be reduced.

According to the method of manufacturing a liquid crystal display device according to the sixth aspect of the present invention, as described above, in addition to the configuration according to the fifth aspect, the injection of the liquid crystal material can be performed by using a liquid crystal from one of the plurality of openings. This is a method in which the pressure inside the cell is reduced and the liquid crystal material is supplied from the other side while pressurizing.

Therefore, the above method has an effect that the liquid crystal material can be injected and filled in a shorter time and more favorably than in the conventional case.

According to a method of manufacturing a liquid crystal display device according to claim 7 of the present invention, as described above, in addition to the structure of claim 5 or 6, one of the pair of substrates is replaced by a plurality of substrates. A step of forming a liquid crystal cell for each small substrate by bonding the plurality of small substrates facing each other to the other substrate so that the small substrate is a connection substrate adjacent on the side surface thereof. This is a method for setting the cell gap for the plurality of liquid crystal cells under the same conditions.

Therefore, the above method has an effect that the liquid crystal display device having a large screen can be manufactured efficiently and at low cost without deteriorating the quality.

[Brief description of the drawings]

FIG. 1 is a plan view illustrating a configuration of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the liquid crystal display device shown in FIG.

FIG. 3 is a plan view showing a configuration near a connection portion of the liquid crystal display device shown in FIG.

FIGS. 4A and 4B are explanatory diagrams showing examples of internal pressure adjusting holes provided in the liquid crystal display device shown in FIG.

FIG. 5 is an explanatory view showing another example of the internal pressure adjusting hole provided in the liquid crystal display device shown in FIG.

FIG. 6 is a diagram showing a flow of a manufacturing process in a method for manufacturing a liquid crystal display device according to an embodiment of the present invention.

FIGS. 7A to 7E are process diagrams showing a method for manufacturing the liquid crystal display device shown in FIG.

FIGS. 8A to 8D are process diagrams illustrating the method for manufacturing the liquid crystal display device shown in FIG. 6 in further detail.

FIG. 9A is a perspective view showing a configuration of a conventional liquid crystal display device, and FIG. 9B is a perspective view of the liquid crystal display device shown in FIG.
FIG. 4 is a cross-sectional view taken along a line B.

10A is a plan view showing another configuration of the conventional liquid crystal display device, and FIG. 10B is a cross-sectional view of the liquid crystal display device shown in FIG.

FIG. 11 is a process chart showing a conventional method for manufacturing a liquid crystal display device.

[Explanation of symbols]

 Reference Signs List 1 CF substrate (substrate, large substrate) 2 Connection substrate (substrate) 2a TFT substrate (substrate, small substrate) 2b TFT substrate (substrate, small substrate) 3 Sealing material 8a Liquid crystal cell 8b Liquid crystal cell 9 Internal pressure adjusting hole (opening) 14 Liquid crystal layer

Claims (7)

[Claims] 1. A liquid crystal display device comprising a pair of substrates opposed to each other bonded together at least with a sealing material to form a liquid crystal cell, and filling the liquid crystal cell with a liquid crystal material. A liquid crystal display device comprising a plurality of openings for adjusting pressure in a cell. 2. The liquid crystal display device according to claim 1, wherein the openings are provided at positions farthest from each other in the liquid crystal cell. 3. The liquid crystal display device according to claim 1, wherein the opening is provided in a non-display portion of a display screen of the liquid crystal display device. 4. One of the pair of substrates is one connection substrate adjacent to a plurality of small substrates on side surfaces thereof. The liquid crystal display device as described in the above. 5. A liquid crystal cell is formed by bonding at least a pair of substrates facing each other with a sealant, and after setting a cell gap of the liquid crystal cell, a liquid crystal material is injected into the liquid crystal cell to form a liquid crystal layer. In a method of manufacturing a liquid crystal display device, a substrate having a plurality of openings in one of the pair of substrates is used, and the pressure in the liquid crystal cell is adjusted from the plurality of openings, so that each of the substrates is at atmospheric pressure. A step of setting a cell gap by pressing; a step of injecting a liquid crystal material by adjusting a pressure in the liquid crystal cell from the plurality of openings; and a step of sealing the opening after the injection of the liquid crystal material. And a method of manufacturing a liquid crystal display device. 6. The method according to claim 5, wherein the liquid crystal material is injected by reducing the pressure in the liquid crystal cell from one of the plurality of openings and supplying the liquid crystal material from the other while pressurizing the liquid crystal material. Of manufacturing a liquid crystal display device. 7. A method according to claim 1, wherein one of said pair of substrates is a connection substrate having a plurality of small substrates adjacent to each other on a side portion thereof. 7. The method according to claim 5, further comprising a step of forming a liquid crystal cell for each of the small substrates by laminating and facing each other, and setting the cell gap for the plurality of liquid crystal cells under the same condition. A method for manufacturing a liquid crystal display device.