JPH06332000A - Signal wiring structure of liquid crystal display module - Google Patents

Abstract

PURPOSE:To uniformly supply signals to the liquid crystal display module by making signal wirings corresponding to output terminals of a driver IC and the area by which respective sample holding capacitors corresponding to them overlap uniform in the respective sample holding capacitors. CONSTITUTION:The driver IC 3 is equipped with the sample holding capacitors 1, whose periphery is covered with an insulating film 10 made of polyimide, etc. Further, two sample holding capacitors 1 correspond to one signal line 4 and are positioned almost in the center of the signal line 4 to overlap with the signal wirings across a dielectric material. The respective signal lines 4 uniformly overlap with the respective sample holding capacitors 1 of the driver IC 3. Consequently, the signals which are supplied can be made uniform in voltage level and a line shaped luminance irregularity due to unevenness of supplied signal voltages can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal wiring structure of a liquid crystal display module.

[0002]

2. Description of the Related Art In recent years, liquid crystal display devices have been made finer and finer. However, as the fineness of liquid crystal display has been made higher, influences among the respective mounting components such as signal wirings and driver ICs cannot be ignored. .

FIG. 6 shows a plan view of a signal wiring structure of a conventional liquid crystal display module, FIG. 7 shows an enlarged plan view of a region surrounded by a chain line of FIG. 6, and FIG. 8 shows a solid line A of FIG. '
7 is a cross-sectional view of the position of the sample-hold capacitor near the end of the driver IC along the line, and FIG. 9 is a cross-sectional view of the position of the output terminal of the driver IC near the end of the driver IC along the solid line B ′ of FIG. Indicates.

As shown in FIG. 6, a driver IC 3 for driving, which supplies a signal to a liquid crystal display module provided with a plurality of sample and hold capacitor rows 2 composed of a plurality of sample and hold capacitors 1, is a transparent insulating substrate such as glass. It is electrically connected to the signal wiring 4 on the substrate through a dielectric substance. The input of each signal to the driver IC 3 is input from the input wiring 5 on one side surface of the driver IC 3.

[0005] Here, dielectric material, the first SiN _X or the like on signal lines below the insulating film, covering the sample hold capacitor second consisting of a polyimide or the like is one of the circuits constituting the driver IC Insulating film and driver IC
It is an adhesive that bonds the signal wiring board and the signal wiring board.

As shown in FIG. 7, the signal wiring 4 is connected from the signal output terminal 7 of the driver IC 3 to the liquid crystal display module so as to overlap the sample hold capacitor array 2 of the driver IC.

At this time, there is a sample hold capacitor 1 that does not overlap the signal wiring 4.

This will be described with reference to FIGS. 8 and 9.

First, the physical and electrical connection between the driver IC and the signal wiring board 6 will be described with reference to FIG.

A signal wiring 4 made of Au / Cr or the like is formed on a transparent insulating signal wiring substrate 6, for example, a glass substrate, and a contact hole for contacting a signal output terminal 7 of a driver IC 3 described later is formed on the signal wiring 4. A first insulating film 9 made of SiN _x or the like is laminated and covered on the entire surface of the region other than 8.

The signal wiring board 6 and the driver IC 3 are physically connected by an adhesive 12 mixed with conductive particles 11 having a particle size of about several microns, and a signal output terminal 7 of the driver IC 3 and a signal are connected. The wiring 4 is electrically connected by the conductive particles 11 through a region where the above-described first insulating film 9 is not stacked, that is, through the contact hole 8 provided in the first insulating film 9. .

Next, a method of superimposing the sample-hold capacitor 1 and the signal wiring 4 will be described with reference to FIG. 9 showing a sectional view of the vicinity of the sample-hold capacitor 1 of the driver IC.

On the other hand, the driver IC 3 is provided with a sample and hold capacitor 1, and the periphery thereof is covered with a second insulating film 10 made of polyimide or the like.

Two sample and hold capacitors correspond to one signal line.

The other signal wiring 4 is a driver IC connected to a contact hole 8 formed in the first insulating film 9.
3 is connected to the liquid crystal display module through a path that overlaps the position of the sample and hold capacitor 1 of the driver IC 3 from the output terminal 7 part of the driver IC 3, but in order to reduce the resistance of the wiring, the output Since it is arranged through the shortest diagonal distance from the terminal, in the region at the end of the driver IC, there is a supplement hold capacitor that does not overlap the signal wiring.

Therefore, the mutual influence of the signal wiring and the sample and hold capacitor is not uniform, so that a line-shaped luminance unevenness occurs in the image of the liquid crystal display module.

Here, the influence of the sample hold capacitor of the driver IC on the image in the case of the conventional signal wiring structure of the liquid crystal display module will be described.

FIG. 10 shows the influence on the image from the sample hold capacitor of the driver IC in the case of the signal wiring structure of the conventional liquid crystal display module.

Here, the case where the number of the signal wirings 4 corresponding to one row of the sample and hold capacitor row 2 is 15 is shown.

In the figure, the horizontal axis shows the number of the signal wiring from the left end on the video signal side of the liquid crystal display module, and the vertical axis shows the output voltage level of the signal wiring.

As shown in the figure, conventionally, signal wirings (30n + 1 and 30n + 30) which are not substantially overlapped with the sample and hold capacitors near both ends of the driver IC.
No., n = 0, 1, 2, 3, and in the signal wiring numbers in the figure, about 1/4 overlaps with No. 1, No. 30, No. 31, No. 60, and No. 61) and a sample hold capacitor. No signal wiring (30n + 2 and 30n + 29, n =
0, 1, 2, 3 and 2 in the signal wiring number in the figure
No. 29, 32, 59 and 62),
The voltage of the signal supplied to the driver IC 3 is compared with the voltage of the signal wiring superimposed on the sample hold capacitor near the center of the driver IC such as signal wiring numbers 10 and 25 in the figure, The voltage of the supplied signal is high.

Therefore, when the display system is a normally white system, areas of high brightness in the vertical direction are generated at equal intervals in the case of the signal wiring on the video signal side, and in the case of the signal wiring on the scanning signal side. However, there is a drawback that regions of high brightness in the horizontal direction are generated at equal intervals in the image of the liquid crystal display module.

As a matter of course, in the normally black method, contrary to the normally white method, in the case of the signal wiring on the video signal side, areas of low luminance are generated in the vertical direction at equal intervals, and scanning is performed. In the case of signal wiring on the signal side,
There is a drawback that regions of low brightness are generated in the horizontal direction at equal intervals in the image of the liquid crystal display module.

[0024]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the related art. Signal wiring for supplying an output signal from a driver IC for driving a liquid crystal display module to the liquid crystal display module, and a driver An object of the present invention is to provide a wiring structure of a liquid crystal display module, which is arranged so that the area where each sample and hold capacitor included in the IC overlaps is uniform and which can uniformly supply a signal to the liquid crystal display module. And

[0025]

A wiring structure of a liquid crystal display module of the present invention includes a signal wiring for supplying a signal to the liquid crystal display module on a transparent insulating substrate and a dielectric substance on the signal wiring. A signal wiring structure of a liquid crystal display module, comprising: a driver IC in which a plurality of sample and hold capacitors corresponding to the respective signal wirings are arranged; and the signal wirings and the driver ICs are connected to each other,
The area where the signal wiring corresponding to the output terminal of the driver IC and the sample hold capacitors corresponding to the signal wirings overlap is uniform in each sample hold capacitor.

[0026]

According to the present invention, the signal wiring for supplying the output signal from the driver IC for driving the liquid crystal display module to the liquid crystal display module is provided with all the sample and hold capacitors for each sample and hold capacitor array provided in the driver IC. Since the capacitors are arranged so as to be evenly superimposed, it is possible to make the supplied signals uniform.

[0027]

1 is a plan view of a signal wiring structure of a liquid crystal display module of the present invention, FIG. 2 is an enlarged plan view of a region surrounded by a chain line in FIG. 1, and FIG. FIG. 4 shows a cross-sectional view of the position of the sample hold capacitor near the end of the driver IC along the solid line A, and FIG. 4 shows a cross section of the position of the output terminal of the driver IC near the end of the driver IC along the solid line B of FIG. The figure is shown.

As shown in FIG. 1, a plurality of sample and hold capacitor arrays 2 each having a plurality of sample and hold capacitors 1 arranged therein are provided, and a driver IC 3 for driving to supply a signal to a liquid crystal display module is a transparent insulating substrate. ,
For example, the signal wiring 4 on the glass substrate is electrically connected via a dielectric substance.

Each signal to the driver IC 3 is supplied to the driver I.
The signal is input from the signal input terminal 5 of the driver IC 3 from one side surface of C3.

Although not shown, the number of driver ICs is, for example, 6 on the video signal side around the liquid crystal display module.
And eight on the scanning signal side.

As shown in FIG. 2, the signal wirings 4 are arranged so as to be uniformly overlapped with the positions where the sample and hold capacitors 1 of the sample and hold capacitor rows 2 of the driver IC 3 are formed.

The sample-hold capacitor for holding the signal supplied to the signal wiring C in the figure is D in the figure.
However, the sample-hold capacitor D is arranged such that the area overlapping the signal wirings other than the signal wiring C is uniform with the other signal wirings.

By doing so, the first insulating film such as SiN _X on the signal wiring, which will be described later, and the second insulating film made of polyimide or the like, which covers the sample-hold capacitor which is one circuit constituting the driver IC. And driver IC
The applicant of the present application has found that the capacitance generated between the sample-hold capacitor and the signal wiring affects the entire signal wiring in a well-balanced manner by each dielectric substance of the adhesive that bonds the signal wiring board to the signal wiring board. Discovered by experiment.

The connection between the driver IC and the signal wiring board and the superposition of the sample and hold capacitors for the signal wiring are performed according to FIG. 3 showing the sectional view of the solid line A of FIG. 2 and FIG. 4 showing the sectional view of the solid line B of FIG. Explain how.

First, as shown in FIG. 3, Au / Cr or I is placed on a transparent insulating signal wiring substrate 6, for example, a glass substrate.
TO (Indium Tin Oxide) material and has the signal line 4 with a thickness of about 1000Å to 2000Å is formed to a, in the entire region other than the contact holes 8 making contact with the signal output terminal 7 of the driver IC3 thereon, SiN _X The first insulating film 9 is laminated and covered. The transparent insulating signal wiring substrate 6 is not limited to the glass substrate, and may be a quartz substrate.

The driver IC 3 and the signal wiring board 6 are physically connected to each other by the adhesive 12 mixed with the conductive particles 11 having a particle diameter of about several microns, as in the conventional connection method. The signal output terminal 7 and the signal wiring 4 of the driver IC 3 are formed by the conductive particles 11 through a region where the above-described first insulating film 9 is not stacked, that is, through the contact hole 8 provided in the first insulating film 9. It is electrically connected.

Next, as shown in FIG. 4, the driver IC 3
Is provided with a sample-hold capacitor 1 and the surrounding area is covered with a second insulating film 10 made of polyimide or the like. Further, two sample-hold capacitors 1 correspond to one signal wiring 4, and they are located substantially at the center of the signal wiring 4 and overlap with the signal wiring via the above-mentioned dielectric substance.

It is a feature of the present invention that the signal wirings 4 are uniformly overlapped with the sample-hold capacitors 1 of the driver IC 3.

Here, in the case of the signal wiring structure of the liquid crystal display module of the present invention, that is, in the case where each signal wiring overlaps with each sample hold capacitor of the driver IC, the sample hold capacitor among the signal wires overlaps. The effect of the structure of the signal wiring on the image is compared with that of the conventional signal wiring which is not.

FIG. 5 is a characteristic diagram showing the influence on the image from the sample hold capacitor of the driver IC in the case of the signal wiring structure of the liquid crystal display module of the present invention.

Here, the case where the number of signal wirings 4 corresponding to one column of the sample and hold capacitor row 2 is 15 is shown.

In the figure, the horizontal axis shows the number of the signal wiring from the left end on the video signal side of the liquid crystal display module, and the vertical axis shows the output voltage level of the signal wiring. The signal wiring numbers correspond to those described in the section of the prior art described above.

As shown in the figure, the signal wiring (signal wiring numbers 1 and 30 in the figure) which has hardly overlapped with the sample-hold capacitor near the end of the driver IC in the past has been used.
No. 31, No. 31, No. 60, and No. 61), and signal lines that did not overlap with the sample-and-hold capacitor by about 1/4 (No. No. 2, No. 29, No. 32, No. 59, and No. 62 in the figure) Also in the above, the voltage of the signal supplied to the liquid crystal display module is not uniformly increased and is uniformly supplied to the liquid crystal display module.

Therefore, in the image of the liquid crystal display module, when the display system is a normally white system, in the case of the signal wiring on the video signal side, it is superimposed on the sample hold capacitor near the end of the driver IC as in the conventional case. It is possible to supply a uniform image without generating areas of high brightness in the vertical direction at equal intervals for each signal wiring.

As a matter of course, in the normally black system, contrary to the normally white system, in the case of the signal wiring on the video signal side, regions of low luminance are generated at equal intervals in the vertical direction, and scanning is performed. In the case of signal wiring on the signal side,
It is possible to supply a uniform image without evenly spaced laterally low brightness regions in the image of the liquid crystal display module.

In the above embodiment, the signal wiring on the video signal side has been described in particular, but it is clear that the same effect can be obtained by using the present invention on the scanning signal side.

Further, the sample hold capacitor D for holding the signal supplied to the signal wiring A in FIG. 2 described above may be overlapped with the signal wiring C itself if there is a space for disposing the signal wiring.

Further, the general formula 3 representing the above-mentioned signal wiring number
0n + 1, 30n + 30, 30n + 2 and 30n + 29
Is only for the case where the number of signal wirings corresponding to one row of sample and hold capacitor rows is 15, and the value of n in the formula varies depending on the number of signal wirings, and generally n is 0 or more. Is an integer.

[0049]

According to the present invention, the area in which the signal wiring for supplying the output signal from the driver IC for driving the liquid crystal display module to the liquid crystal display module and each sample and hold capacitor provided in the driver IC overlap each other. However, since they are arranged so as to be uniform in each sample-and-hold capacitor, the voltage level of the supplied signal can be made uniform, and the line-shaped luminance caused by the nonuniformity of the supplied signal voltage. It is possible to prevent the occurrence of unevenness.

[Brief description of drawings]

FIG. 1 is a plan view showing a wiring structure of a liquid crystal display module of the present invention.

FIG. 2 is an enlarged plan view showing a wiring structure of the liquid crystal display module of the present invention.

FIG. 3 is a cross-sectional view showing a wiring structure around a driver IC of the present invention.

FIG. 4 is a cross-sectional view showing a wiring structure around a driver IC of the present invention.

FIG. 5 is a characteristic diagram showing characteristics according to the wiring structure of the liquid crystal display module of the present invention.

FIG. 6 is a plan view showing a wiring structure of a conventional liquid crystal display module.

FIG. 7 is an enlarged plan view showing a wiring structure of a conventional liquid crystal display module.

FIG. 8 is a cross-sectional view showing a wiring structure around a conventional driver IC.

FIG. 9 is a cross-sectional view showing a wiring structure around a conventional driver IC.

FIG. 10 is a characteristic diagram showing characteristics according to a wiring structure of a conventional liquid crystal display module.

[Explanation of symbols]

 1 Sample and Hold Capacitor 2 Sample and Hold Capacitor Row 3 Driver IC 4 Driver IC Signal Wiring 5 Driver IC Signal Input Wiring 6 Signal Wiring Board 7 Driver IC Signal Output Terminal 8 Contact Hole 9 First Insulating Film 10 Second Insulation Membrane 11 Conductive Particle 12 Adhesive

Claims (1)

[Claims] 1. A signal wire for supplying a signal to a liquid crystal display module is arranged on a transparent insulating substrate, and a plurality of sample-hold capacitors corresponding to the signal wires are arranged on the signal wire via a dielectric material. A signal wiring structure of a liquid crystal display module in which the signal wiring and the driver IC are connected to each other, the signal wiring corresponding to the output terminal of the driver IC, and the signal wiring. A signal wiring structure of a liquid crystal display module, wherein an area where the sample and hold capacitors overlap with each other is uniform in each of the sample and hold capacitors.