JP2002040454A - Planar display device and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a planar display device in which the alignment effect by rubbing hardly shows fluctuation. SOLUTION: The triboelectric charges during rubbing are decreased by forming a dummy pattern 250 from the same material as the transparent electrode 231, in a nondisplay region outside of a transparent electrode 231 on a counter substrate 200.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a counter substrate used for a flat display device such as a liquid crystal display device and a method for manufacturing the same.

[0002]

2. Description of the Related Art Opposite substrates used in liquid crystal display devices are:
The structure is such that a light-shielding film and a color filter are provided on a glass substrate, a protective film is provided thereon, a transparent electrode is provided on the protective film, and an alignment film is provided.

In order to obtain the alignment of liquid crystal molecules, it is necessary to perform an alignment treatment on the alignment film. Therefore, a rubbing method is used as a method of the alignment treatment.

In this rubbing method, a rubbing roll is moved along an rubbing direction on an alignment film of a counter substrate to perform an alignment process.

[0005]

However, when the alignment treatment is performed by the rubbing method as described above, the alignment effect sometimes varies. This is because there is a large difference between the charge amount between the rubbing cloth wound on the surface of the rubbing roller and the transparent electrode and the charge amount between the rubbing cloth and the portion where the transparent electrode is not provided.

That is, since only the insulating protective film is present in the portion where the transparent electrode is not provided, frictional charging occurs at the time of rubbing with a rubbing roller, and the portion where the transparent electrode is provided is not charged. This is because there is a difference in the amount of charge between them.

Accordingly, the present invention has been made in view of the above problems, and has as its object to provide a flat panel display device in which the alignment effect hardly varies, and a method of manufacturing the same.

[0008]

According to a first aspect of the present invention, a plurality of scanning lines and a signal line are arranged so as to intersect, and a switching element is arranged at each intersection of the scanning line and the signal line. An array substrate in which pixel electrodes are connected to the switching elements; and a counter substrate disposed with the light modulation layer interposed between the array substrate and the light modulation layer. The counter substrate includes a glass substrate on which a light shielding film and a color filter are disposed. A flat display device, wherein an insulating protective film is disposed on the light-shielding film and the color filter, a transparent electrode is disposed on the protective film, and an alignment film is disposed on the transparent electrode. Is a flat display device provided in a display area of the flat display device and a non-display area located outside the display area.

According to a second aspect of the present invention, the transparent electrode in the non-display area is provided on the end side when the alignment treatment is performed on the alignment film with a rubbing roll. It is a flat display device.

According to a third aspect of the present invention, a plurality of scanning lines and signal lines intersect with each other, a switching element is arranged at each intersection of the scanning line and the signal line, and a pixel is provided in the switching element. An array substrate to which electrodes are connected, and a counter substrate disposed with the array substrate and a light modulation layer interposed therebetween, wherein the counter substrate is provided with a light shielding film and a color filter on a glass substrate, and the light shielding film An insulating protective film is disposed on the color filter, a transparent electrode is disposed on the protective film, and a method of manufacturing a flat panel display device includes an alignment film disposed on the transparent electrode. It is provided in a display area of a flat display device and a non-display area located outside the display area, and when the alignment film is subjected to an alignment treatment with a rubbing roll, the processing ends at the position of the transparent electrode in the non-display area. Feature It is a manufacturing method of the surface display device.

According to the present invention, a conductive transparent electrode is also provided in a non-display area when rubbing is performed with a rubbing roller. Does not occur.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid crystal display device 10 according to an embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 2, the liquid crystal display device 10
A light-transmitting active-matrix type having an effective display area 3 of a 15-inch diagonal GA, and a backlight 12
Transmission type liquid crystal cell 14 for displaying using light source light from
including. The liquid crystal cell 14 applies a video signal V to a signal line 18.
sig, the scanning signal Vg to the scanning line 20, and the driving circuit unit 16 for supplying the common electrode voltage Vcom to the common electrode and the short ring, respectively.

As shown in FIG. 2, the liquid crystal cell 14 has a thickness of about 5 μm and is disposed between the array substrate 100, the counter substrate 200, and the array substrate 100 and the counter substrate 200 via the alignment films 401 and 411. TN type liquid crystal 300.

Next, a detailed description will be given with reference to FIGS.

The array substrate 100 is orthogonal to the 768 scanning lines 20 made of a molybdenum-tungsten alloy disposed on the glass substrate 101 via a silicon nitride film (SiNx) also serving as a gate insulating film 113 of a TFT 121 described later. 1,024 × 3 (R, G, B) signal lines 18 made of aluminum. The material of the scanning line 20 may be MoTa, Ta, or Al.
In addition, other materials such as Mo, T
a. In the following description, the signal lines are collectively referred to as a signal line 18, the red signal line is referred to as a signal line 18R, and the green signal line is referred to as a signal line 18.
G and blue signal lines are referred to as signal lines 18B. The same applies to other members.

In the vicinity of the intersection between the scanning line 20 and the signal line 18, the scanning line 20 is connected to the gate electrode and the signal line 18.
Is used as a drain electrode 125, an amorphous silicon (a-Si) film 123 is used as an active layer, a channel protective film 129 for protecting the a-Si film 123, and the drain electrode 125 and a
-Resistive semiconductor layers 12 disposed between the source electrode 127 and the a-Si film 123, respectively.
The TFT 121 having an inverted staggered structure including 6,128 is arranged. The source electrode 127 of the TFT 121
Are electrically connected to a pixel electrode 131 made of a transparent electrode (ITO). In this embodiment, the pixel electrode 1
Reference numeral 31 denotes the scanning line 20 in the previous stage and the gate insulating films 113 and 11
The auxiliary capacitance Cs is formed between the pixel electrode 131 and the scanning line 20 at the preceding stage.

On the counter substrate 200, a light-shielding film 211 and a color filter 221 are provided on a glass substrate 201, an insulating protective film 240 is provided thereon, and a counter electrode 231 made of a transparent electrode is provided thereon. Is provided. Then, an alignment film 411 is further disposed thereon.

The signal line 18 and the scanning line 20 are connected to the glass substrate 10 for electrical connection with an external driving circuit.
1 and is led to the signal line pad 22 and the scanning line pad 24, respectively.

Further, the glass substrate 1 of the array substrate 100
An inspection circuit unit 26 for inspecting the signal lines 18 and the scanning lines 20 is provided on 01. This inspection circuit unit 2
Reference numeral 6 is provided at a position facing the side where the signal line pads 22 are arranged. Further, a common electrode pad 94 for applying a common electrode voltage Vcom to the common electrode 231 is provided.

(Method of Manufacturing Opposing Substrate 200) A method of manufacturing the opposing substrate 200 having the above configuration will be described.

On the glass substrate 201, a light-shielding film 211 and a color filter 221 are provided.

An overcoat layer, that is, an insulating protective film 240 is provided thereon. The material of the protective film 240 is a transparent resin insulating material, for example, an organic material such as an acrylic resin, an epoxy resin, a polyimide resin, or a silicon resin is preferable.

After the formation of the protective film 240 as described above, a layer of the transparent electrode 231 which is a counter electrode is provided. The transparent electrode 231 is conductive, and is formed by, for example, an entire film formation method or a partial film formation method.

Then, an alignment film 411 made of, for example, an insulating polyimide resin is formed on the transparent electrode 231 by an offset printing method.

By the way, conventionally, when the transparent electrode 231 was provided, the transparent electrode 231 was provided only in the display area facing the array substrate 100, but in the present embodiment, as shown in FIG. A rectangular transparent electrode (hereinafter, referred to as a dummy pattern) 250 is also provided in a non-display area outside the area.
Are provided along the long side.

The counter substrate 20 formed as described above
0 is subjected to an alignment treatment in a liquid crystal cell manufacturing process. In this case, as shown in FIG. 4, the counter substrate 200 is placed on a stage 260, and rubbing is performed along a rubbing direction by a rubbing roller 262 wound with a rubbing cloth. As shown in FIG. 1, the rubbing direction starts from the side opposite to the side where the dummy pattern 250 is provided, and ends on the side where the dummy pattern 250 is provided.

In this case, since the dummy pattern 250 is conductive similarly to the transparent electrode 231, unlike the insulating protective film 240, there is no difference in the amount of triboelectricity during rubbing. Variation of static electricity generated inside the counter substrate 200 can be suppressed, and variation does not occur in the alignment effect. Therefore, in the case of the liquid crystal display device 10 using the counter substrate 200, display unevenness does not occur.

The position and the number of the dummy patterns 250 are not limited to those in the above embodiment, but may be arranged on the end side in the rubbing direction so that the amount of triboelectric charging is not changed from that of the transparent electrode 231 in the display area. The invention is not limited to the above embodiment.

[0030]

As described above, according to the present invention, since the amount of triboelectric charge generated during rubbing is reduced, the variation in static electricity generated in the opposing substrate is suppressed, and the alignment effect does not vary. No display unevenness of the flat panel display device occurs.

[Brief description of the drawings]

FIG. 1 is a plan view of a counter substrate according to the present embodiment.

FIG. 2 is a perspective view of a liquid crystal display device.

FIG. 3 is a longitudinal sectional view of the liquid crystal display device.

FIG. 4 is an explanatory diagram in the case of performing an alignment process.

[Explanation of symbols]

 200 Counter substrate 231 Transparent electrode 240 Protective film 250 Dummy pattern

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2H090 HA04 HB08Y HC06 LA04 LA05 LA15 MB01 MB04 2H092 JB77 JB79 NA14 PA02 5C094 AA03 AA43 AA48 AA55 BA03 BA43 CA19 CA24 DA13 DA15 DB10 EA01 EA04 EA05 EB02 ED01 FB01 FB02 GB10

Claims (3)

[Claims] A plurality of scanning lines and signal lines are arranged to intersect, a switching element is arranged at each intersection of the scanning line and the signal line, and a pixel electrode is connected to the switching element. An array substrate, and an opposing substrate disposed with the light modulating layer interposed between the array substrate and the opposing substrate, wherein the opposing substrate is provided with a light shielding film and a color filter on a glass substrate, and on the light shielding film and the color filter. An insulating protective film is disposed, a transparent electrode is disposed on the protective film, and an alignment film is disposed on the transparent electrode, wherein the transparent electrode includes a display area of the flat display device and the display region. A flat display device provided in a non-display area located outside a display area. 2. The flat display device according to claim 1, wherein the transparent electrode in the non-display area is provided on the end side when the alignment treatment is performed on the alignment film with a rubbing roll. 3. A plurality of scanning lines and signal lines are arranged to intersect, a switching element is arranged at each intersection of the scanning lines and the signal lines, and a pixel electrode is connected to the switching element. An array substrate, and an opposing substrate disposed with the light modulating layer interposed between the array substrate and the opposing substrate, wherein the opposing substrate is provided with a light shielding film and a color filter on a glass substrate, and on the light shielding film and the color filter. An insulating protective film is disposed, a transparent electrode is disposed on the protective film, and an alignment film is disposed on the transparent electrode. In the method for manufacturing a flat display device, the transparent electrode is displayed on the flat display device. A flat display provided in a non-display area located outside the display area and the display area, and ending at a position of the transparent electrode in the non-display area when performing an alignment process on the alignment film with a rubbing roll. Equipment Production method.