JPH11248930A - Color filter substrate and manufacture thereof, and liquid crystal display element using same color filter substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the liquid crystal display element which has high display uniformity by the method which uses a projection formed on a substrate of the liquid crystal display element for gap control between substrates. SOLUTION: A color filter substrate 1 is used which has a color filter layer 2 formed of colored layers and a light shield layer 3 of specific width and a color filter substrate and further has the projection 5 formed of resin on the light shield layer 3 to specific size so that the center 5a of the projection 5 is not aligned with the width-directional center 3a of the light shield layer 3. When the surface of the color filter substrate where an alignment layer is formed is rubbed, the surface is rubbed in the direction from the center of the projection to the center of the light shield layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter substrate, a method of manufacturing the color filter substrate, and a liquid crystal display device using the color filter substrate. The present invention relates to an image display device, an OA device such as a personal computer or a word processor, It is used for handy terminal equipment and portable information communication equipment in the industrial field.

[0002]

2. Description of the Related Art At present, liquid crystal, plasma and EL displays have been put into practical use as flat panel displays.
Its applications are becoming widespread.

For example, a liquid crystal display device is more
Although the screen size and the number of pixels were inferior, on the other hand, it could be positioned in a product field with excellent portability in weight and volume. At present, as a liquid crystal display element used in a notebook computer or a word processor, a size of about 10 to 12 inches is 640 × 480 dots or 600 × 800.
The number of pixels of the dot is prepared, and although the number of pixels of the CRT is inferior, an excellent display as a display can be shown.

FIG. 6 is a sectional view showing the structure of such a conventional simple matrix type color STN liquid crystal display device.

In FIG. 6, display electrodes 6 are sequentially formed on an electrode substrate 10. A color filter layer 2, a light shielding layer 3, and a transparent resin layer 4 made of an organic material are provided on the opposing color filter substrate 1 to obtain smoothness;
Further, display electrodes 6 are sequentially formed, and an alignment film layer 7 is formed on these display electrodes 6. The electrode substrate thus configured is bonded via a spacer 13 with a sealing material 12 printed around at least one of the substrates so as to keep the gap between the electrode substrates constant, and the liquid crystal 11 is filled in the gap. Enclosed to form a color liquid crystal display element.

[0006] In the future, STN is considering screen sizes of 12 to 17 inches, and the display capacity is also changed from SVGA to XG.
A, SXGA, etc. have also attracted attention as CRT replacement monitors, and their display quality has been required to be higher than in the past, and various manufacturing methods have been studied.

[0007]

However, in a conventional liquid crystal display device in which the gap between the substrates (1 and 10) is maintained via the spacer 13, the spacer 1
Since the alignment state around 3 is different from that without the spacer, a light leakage phenomenon occurs around the spacer 13 during black display, which causes a reduction in the contrast ratio which is an index of display quality. As a solution to this problem,
For example, protrusions 5 are formed on the light shielding layer 3 instead of the spacers 13 as shown in the cross-sectional view of the configuration of the liquid crystal display element disclosed in Japanese Patent Application Laid-Open No. 8-292426 in FIG. Has been proposed.

However, even when the projections 5 are formed on the light-shielding layer 3, an abnormal alignment state exists around the projections, and the abnormal alignment region 14 depends on the rubbing direction which determines the alignment state of the liquid crystal. have. Therefore, there is a problem that the abnormal alignment region 14 generated in the rubbing exit direction around the protrusion extends to the pixel portion in a halfway state of voltage application called a halftone, and the contrast ratio is reduced.

The present invention solves the above problems,
A color filter substrate for providing a liquid crystal display element having high display uniformity in a method of using a projection formed on a substrate to control a gap between substrates of the liquid crystal display element, a method of manufacturing the color filter substrate, and the color filter substrate An object of the present invention is to provide a liquid crystal display device using the same.

[0010]

According to the present invention, there is provided a light-shielding layer on a color filter substrate on which a color filter layer comprising a plurality of colored layers and a light-shielding layer having a predetermined width are formed. A protrusion having a predetermined size made of resin is formed, and the center of the protrusion does not coincide with the center in the width direction of the light shielding layer.

In the method of rubbing the surface of the color filter substrate on which the alignment film layer is formed, rubbing is performed from the center of the projection toward the center of the light shielding layer.

Further, the present invention provides a liquid crystal display device having an electrode substrate rubbed by the above-mentioned manufacturing method.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a plan view (a) and a sectional view (b) of a color filter substrate according to Embodiment 1 of the present invention, and FIG. 2 shows a rubbing method according to Embodiment 1 of the present invention. FIG. 3 is a process diagram showing the first embodiment of the present invention.
FIG. 1 is a cross-sectional view of a liquid crystal display element prepared by the method shown in FIG.

First, a color filter layer 2, a frame-shaped light-shielding layer 3, and a transparent resin layer 4 covering them are formed on a color filter substrate 1, and a display electrode 6 is further formed. Further, projections 5 made of a transparent resin were formed on the light shielding layer 3 in a predetermined pattern, and the positions were arranged so as not to coincide with the center of the light shielding layer 3 in the width direction. At this time, the projections 5 are formed by a photolithography method using a negative type photosensitive transparent resin.
The protrusion 5 was formed at a position shifted by 5 μm from the center 3 a in the width direction of the light-shielding layer 3.

Next, an alignment film layer 7 for controlling the alignment of liquid crystal molecules is formed on the color filter substrate 1, and as shown in FIG. 2, a rubbing cloth 9 made of rayon (Yoshikawa processing YA) adhered to a rubbing roller 8. Using -20R), rubbing was performed from the center of the protrusion to the center of the light-shielding layer.

On the other hand, the display electrode 6 and the alignment film layer 7 facing each other were formed on the electrode substrate 10, and a predetermined rubbing treatment was performed. The rubbing angle is, for example, 2 twists of the liquid crystal.
It was set to be 40 °. Next, a sealing material 12 mixed with a glass fiber (not shown) for gap control is formed, and the color filter substrate 1 and the electrode substrate 10 are formed.
And the sealing material 12 was cured to prepare a liquid crystal panel.

Finally, a liquid crystal 11 was injected into the liquid crystal panel to produce a liquid crystal display device.

When a voltage was applied to the liquid crystal panel formed in this way and a halftone state was observed, an abnormally-aligned region 14 could be seen at the rubbing exit side around the protrusion 5, but due to the effect of displacing the position, it was found in the light-shielding layer 3. It was confirmed that a high-contrast liquid crystal display element was formed.

(Embodiment 2) FIG. 4 is a process diagram showing a rubbing method according to Embodiment 2 of the present invention, and FIG. 5 is a cross-sectional view of a liquid crystal display device produced according to Embodiment 2 of the present invention. It is.

First, as shown in FIG. 4A, a color filter layer 2, a light shielding layer 3 and a transparent resin layer 4 covering them are formed on a color filter substrate 1, and further, a display electrode 6, an alignment film layer 7 Was formed.

Next, as shown in FIG. 4B, projections 5 made of a transparent resin are formed on the light-shielding layer 3 of the color filter substrate 1 in a predetermined pattern. It was arranged not to match. At this time, the projections 5 are formed by a photolithography method using a negative type photosensitive transparent resin. As an example, the projections 5 are 10 μm square and 5 μm in height with respect to the width of the light shielding layer of 25 μm. It was formed at a position shifted by 5 μm from the center.

Finally, the surface of the alignment film layer 7 on the color filter substrate 1 is covered with a rubbing cloth 9 made of rayon (Yoshikawa processing YA-20R) adhered to a rubbing roller 8 from the center of the projection to the light shielding layer. Was rubbed toward the center.

On the other hand, as shown in FIG. 5, opposing display electrodes 6 and an alignment film layer 7 were formed on the electrode substrate 10, and a predetermined rubbing treatment was performed. The rubbing angle was set so that, for example, the twist angle of the liquid crystal was 240 °. Next, a sealing material 12 mixed with a glass fiber (not shown in the figure) for gap control was formed, the color filter substrate 1 and the electrode substrate 10 were bonded, and the sealing material 12 was cured to produce a liquid crystal panel. .

Finally, the liquid crystal 11 was injected into the liquid crystal panel to produce a liquid crystal display device. When a halftone state was observed by applying a voltage to the liquid crystal panel formed in this way, an abnormal alignment region 14 was found at the rubbing exit side around the protrusion, but the alignment was shifted into the light shielding layer 3 due to the effect of shifting the position. It was confirmed that a liquid crystal display element having a contrast was formed.

In this embodiment, the method of forming a color filter is not described, but any method may be used as long as the structure of the present invention is satisfied.

In this embodiment, the rubbing angle is 240 ° and the STN mode is described. However, the same effect can be obtained in the TN mode where the rubbing angle is 90 °.

[0028]

As described above, the present invention relates to a method of using a projection formed on a substrate for controlling a gap between substrates of a liquid crystal display element. By offsetting from the center and specifying the rubbing direction, it is possible to reduce the influence of abnormal alignment generated around the protrusion, so that a liquid crystal display element with high display uniformity can be provided.

[Brief description of the drawings]

FIG. 1 is a plan view (a) and a cross-sectional view (b) of a color filter substrate according to Embodiment 1 of the present invention.

FIG. 2 is a process chart showing a rubbing method according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view of the liquid crystal display element according to Embodiment 1 of the present invention.

FIG. 4 is a process chart showing a rubbing method according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a liquid crystal display element according to Embodiment 2 of the present invention.

FIG. 6 is a cross-sectional view illustrating a configuration of a conventional liquid crystal display element.

FIG. 7 is a sectional view showing another configuration of a conventional liquid crystal display element.

[Explanation of symbols]

 Reference Signs List 1 color filter substrate 2 color filter layer 3 light shielding layer 4 transparent resin layer 5 projection 6 display electrode 7 alignment film layer 8 rubbing roller 9 rubbing cloth 10 electrode substrate 11 liquid crystal 12 sealing material 13 spacer 14 abnormal alignment area

Claims (4)

[Claims] 1. A plurality of projections of a predetermined size made of resin are formed on a light-shielding layer on a color filter substrate on which a color filter layer having a plurality of coloring layers and a plurality of light-shielding layers having a predetermined width are formed. A color filter substrate formed, wherein the center of the protrusion does not coincide with the center in the width direction of the light shielding layer. 2. The method of manufacturing a color filter substrate according to claim 1, wherein the alignment film layer is formed, wherein the rubbing is performed from the center of the projection toward the center of the light-shielding layer. Method. 3. A liquid crystal display device comprising a color filter substrate produced by the method according to claim 2. 4. The color filter substrate according to claim 1, wherein the size of the protrusion in the width direction is smaller than the width of the light shielding layer.