JPH03260628A - Production of liquid crystal device - Google Patents

Abstract

PURPOSE:To prevent the destruction of oriented film layers by the static electricity generated during a rubbing treatment by subjecting substrates to the rubbing treatment, then cutting segment electrodes by a laser. CONSTITUTION:The segment electrodes 22a, 22b, 22c of the liquid crystal device before the rubbing treatment are provided on the substrates 21. The oriented film layers are provided on these substrates and after the layers are subjected to the rubbing treatment, the segment electrodes are cut by the laser to obtain the segment electrodes 24a to 24f after the cutting. The segment electrodes 22a, 22b, 22c are subjected to the rubbing treatment in the state of connecting the spacings in such a manner and thereafter the segment electrodes are cut to form the segment electrodes 24a to 24c and 24d to 24f provided with the spacings, by which the generation of the electric discharge during the rubbing treatment is obviated. Consequently, the destruction of the oriented film layers is prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing an electro-optical device using liquid crystal used in systems such as computer terminals, image display devices, and shutters, and in particular to a method for manufacturing an electro-optical device using a liquid crystal. Regarding the forming method.

[Summary of the invention] Segment electrodes (data signal electrodes) and common electrodes (scanning signal electrodes) each made of a transparent electrode layer are provided on a pair of substrates,
Furthermore, in a dot matrix type liquid crystal device in which an alignment film layer is provided on each electrode layer and a liquid crystal is sandwiched between the substrates, the alignment film layer is removed by electrostatic electricity by rubbing the substrate and cutting the segment electrodes with a laser. The aim is to prevent destruction and obtain a liquid crystal device with high display quality.

[Prior Art] As a donmatrix type display device, liquid crystal display devices are attracting a lot of attention because they are thin, lightweight, and have low power consumption.

A conventional method for forming an alignment film for a liquid crystal device is to apply a polyimide polymer resin onto a substrate and then rub the film in a certain direction with a cloth (Japanese Patent Laid-Open No. 143525/1983).

[Problems to be Solved by the Invention] However, although the above-mentioned rubbing method has the advantage of being excellent in mass production, since the alignment film layer made of polyimide polymer resin is rubbed with cloth etc., static electricity is generated due to friction. It will happen. And, when the charges are discharged, the alignment film layer is partially destroyed.

This phenomenon will be explained based on FIG. FIG. 3 (δ) is a diagram explaining the structure of the electrodes of a liquid crystal device, in which 31a,
31b, 31c, and 32a, 32b, 32
c is a segment electrode in a liquid crystal device, 33a, 3
3b, 33c, 33d, 33e, and 33f are common electrodes, and the segment electrodes and the common electrodes are placed on a pair of opposing substrates. Furthermore, the orientation 11U1m is placed on these electrodes in a symmetrical manner.

3rd issue) is a diagram showing the substrate on the segment electrode side. When the substrate is rubbed with cloth etc., charges accumulate on the electrodes, between 31a and 32a, between 31b and 32b, and between 31a and 32b.
Charge discharge occurs between c and 32c. As a result 34a
, 34b , 34c , 34d , 34e , 3
The alignment film layer is destroyed as shown in 4f.

FIG. 3 fcl is a diagram in which such a substrate is used as the segment electrode side substrate and the common electrode side substrate is opposed. The area where the segment electrode and the common electrode intersect is the area where information is displayed and is called a pixel. 35a,
35b, 35c, 35d, 35e, 3
In the 5f region, there was a problem that pixels were missing because the alignment film layer was destroyed by static electricity.

In fact, when displaying with such a liquid crystal device, a line runs in the center of the display screen completely unrelated to the displayed information, significantly degrading the display quality.

The present invention is intended to solve these problems, and its purpose is to prevent static electricity generated during the rubbing process.

[Means to solve the problem]

In order to solve the above problems, the present invention provides segment electrodes and common electrodes made of transparent electrode layers on a pair of substrates, further provides an alignment film layer on each electric bridge layer, and sandwiches liquid crystal between the substrates. In the donmatrix type liquid crystal device, the segment electrodes are cut with a laser after the substrate is rubbed.

[Function] Conventionally, when the resistance of the alignment film layer is high, when the substrate is rubbed with cloth or the like, charges accumulate in the electrode layer, and as shown in FIG.
However, in the present invention, the rubbing process is performed with these gaps connected, and then the gaps are created by cutting with a laser, thereby preventing the discharge during the rubbing process. This method takes advantage of the fact that this phenomenon is prevented, and as a result, the alignment film layer is not destroyed.

[Examples] The details of the present invention will be described below based on illustrated examples.

FIG. 1 is a cross-sectional view of the liquid crystal device of the present invention, in which 11a, 11a,
Ilb is an X+ layer made of glass, plastic, etc., and a segment electrode layer 12a, a common electrode layer 12b, and alignment film layers 13a and 13b are provided on the surface.

The paired substrates are placed so that their alignment film surfaces face each other.

14a and 14b are sealants for sealing the liquid crystal, and 15 is a liquid crystal material.

(Example 1) Figure 2+a+ is a diagram showing the structure of the segment electrode of the liquid crystal device of the present invention before rubbing treatment, in which 21 is the substrate, 2
2a, 22b, and 22c are segment electrodes.

After providing an alignment film layer on this substrate and performing a rubbing process, segment electrodes are cut with a laser.

FIG. 2 (bl is a diagram showing the segment electrodes after being cut. 23 is a substrate, 24a, 24b, 24c
, 24d, 24e, and 24f are segment electrodes after laser cutting.

(Example 2) FIG. 2(C) is a diagram showing the structure of the segment electrode of the liquid crystal device of the present invention before rubbing treatment, in which 25 is a substrate, 2
6a, 26b, and 22c are segment electrodes.

After providing an oriented layer on this substrate and performing a rubbing treatment, segment electrodes are cut with a laser.

FIG. 2+dl is a diagram showing the segment electrode after being cut. 27 is a substrate, 28a, 28b, 28c
, 28d, 28e, and 28f are segment electrodes after laser cutting.

This embodiment has the advantage that the laser irradiation area is smaller than (Embodiment 1), so the cutting operation time is shortened.

(Example 3) FIG. 2(e) is a diagram showing the structure of the segment electrode of the liquid crystal device of the present invention before rubbing treatment, in which 41 is a substrate;
2a, 42b, and 42c are segment electrodes.

After providing an alignment film layer on this substrate and performing a rubbing process, segment electrodes are cut with a laser.

FIG. 2 1fl is a diagram showing the segment electrode after being cut. 43 is a substrate, 44a, 44b, 44
c, 44d, 44e, and 44f are segment electrodes after laser cutting.

In this example, cutting was performed at two locations. Compared to (Example 2), the cutting operation time is about twice as long, but the advantage is that the yield of the cutting operation is improved.

As a result of the above, the destruction of the segment electrodes due to static electricity during the rubbing process was eliminated, and a liquid crystal device with no display unevenness was obtained.

The material of the electrode used in this example was made of ITo, and the layer ff10
00 angstroms. The laser used was a YAG laser. Segment electrodes can be cut,
Any laser may be used as long as it has energy that does not affect the substrate.

The gap between the cut segment electrodes is 3 μm visually.
m or less is preferable. This is because the alignment film layer is also destroyed by the laser in the gap, and the liquid crystal molecules are no longer aligned. As the alignment film material, the same effect can be obtained as long as it is a material that requires a rubbing process.

The rubbing cloth used in the above examples was made of polymeric fibers such as polyester and nylon, but static electricity was reduced and similar effects were obtained regardless of the material.

Regarding liquid crystal devices, the same effect can be achieved regardless of the type of liquid crystal material, as long as the liquid crystal device is subjected to rubbing treatment, such as twisted nematic type, super twist type, which performs horizontal alignment, or homeotropic pink type, which performs vertical alignment. Obtained.

Furthermore, similar effects were obtained by changing the rotational direction, number of times of movement, rotational speed, and movement speed of the roll.

[Effects of the Invention] As explained above, according to the present invention, segment electrodes and common electrodes made of transparent electrode layers are provided on a pair of substrates,
Furthermore, in a donmatrix liquid crystal device in which an alignment film layer is provided on each electrode layer and a liquid crystal is sandwiched between the substrates, after rubbing the substrates, the segment electrodes are cut with a laser to form an alignment layer using static electricity. It has become possible to prevent the destruction of the liquid crystal and obtain a liquid crystal device with high display quality.

12b......Common electrode layer 13a,
13b.......Alignment film layer 14a, 14b
・・・・・・ Sealink agent 15・・・・・・・
...Liquid crystal material supplier Seiko Denryo Kogyo Co., Ltd.

Claims (1)

[Claims] In a dot matrix type liquid crystal device, a segment electrode and a common electrode each made of a transparent electrode layer are provided on a pair of substrates, an alignment film layer is further provided on each of the electrode layers, and a liquid crystal is sandwiched between the substrates. After rubbing the
A method for manufacturing a liquid crystal device, characterized by cutting segment electrodes with a laser.