JPH03260625A - Liquid crystal device - Google Patents

Abstract

PURPOSE:To prevent the generation of static electricity during a rubbing treatment by specifying the spacing between the segment electrodes provided on substrates from 1mum to 5mum. CONSTITUTION:The dot matrix type liquid crystal device which is constituted by providing the segment electrodes and common electrodes consisting of transparent electrode layers on a pair of substrates and clamping a liquid crystal between the substrates provided further with oriented film layers on the respective electrode layers is so constituted as to prevent the destruction of the oriented film layers by static electricity and to have high display quality. Namely, the segment electrodes 22a to 22f formed on the substrates 21 are so formed that the spacings between the segment electrodes, for example, 22a and 22b, 22a and 22d, etc., are from 1mum to 5mum. The electric charges generated by the rubbing treatment are gradually discharged and the destruction of the oriented films is obviated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electro-optical device using liquid crystal used in systems such as computer terminals, image display devices, and shutters.

[Summary of the invention] A segment electrode (
In a dot matrix type liquid crystal device in which a data signal electrode) and a common electrode (scanning signal electrode) are provided, an alignment film layer is provided on each electrode layer, and a liquid crystal is sandwiched between substrates, the gap between segment electrodes is 1 μm. The aim is to prevent destruction of the alignment film layer due to static electricity and obtain a liquid crystal device with high display quality by setting the thickness to 5 μm.

[Prior Art] As a toso matrix type display device, a liquid crystal display device that takes advantage of the characteristics of being thin, lightweight, and low power consumption is attracting attention.

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 (al is a diagram explaining the structure of the electrode of a liquid crystal device, 31a, 3 in the figure
1b, 31c, and 32a, 32b, 32c are segment electrodes in the liquid crystal device, and 33a, 33b, 3
3c, 33d, 33e, 33f are common electrodes,
The segment electrodes and the common electrode are installed on a pair of opposing substrates. Furthermore, alignment film layers are placed on these electrodes in a manner that they face each other.

FIG. 3 (bl is a diagram showing the substrate on the segment electrode side. When the substrate is rubbed with a cloth or the like, charge accumulates on the electrode, and between 31a and 32a, between 31b and 32b, and between 31
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, 3
5b, 35c, 35d, 35e, 35
In the region f, the alignment film layer was destroyed by static electricity, so there was a problem that pixels were missing.

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 for Solving the Problems] 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 electrode layer, A dot matrix type liquid crystal device in which a liquid crystal is sandwiched between substrates is characterized in that the gap between segment electrodes is 1 μm to 5 μm.

[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, resulting in
Charges are discharged all at once through the alignment film layer between 1a and 32a, between 31b and 32b, and between 31c and 32c, but by narrowing these gaps from 1 μm to 5 μm, the charges are gradually discharged. This method takes advantage of the fact that the alignment film layer will not be 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,
llb is a substrate made of glass, plastic, etc., on the surface of which are provided a segment electrode layer 12a, a common electrode layer 12b, and alignment film layers 13a and 13b.

The paired substrates are installed 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.

FIG. 2 is a diagram showing the structure of segment electrodes of the liquid crystal device of the present invention, in which 21 is a substrate, 22a, 22b, 22c,
22d, 22e, and 22f are segment electrodes.

22a and 22b, 22c and 22d, 22e and 22f
Conventionally, the gap was 10 μm or more. In the present invention, this gap is set from 1 μm to 5 μm.

As a result, the generation of static electricity was eliminated, and a liquid crystal device with no display unevenness was obtained.

The gap between the segment electrodes can be effective if it is 5 μm or less, but if it is 1 μm or less, it may cause a short circuit between the segment electrodes.

As the material for the alignment film, 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 or nylon. Regardless, static electricity was reduced and a similar effect was obtained.

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 dot matrix type liquid crystal device in which an alignment film layer is provided on each electrode layer and liquid crystal is sandwiched between substrates, the gap between segment electrodes is 1 μm to 5 μm to prevent destruction of the alignment film due to static electricity. Therefore, it has become possible to obtain a liquid crystal device with high display quality.

13a, 13b ・ ・ ・ ・ ・ ・ ・ 1
4a, 14b ・ ・ ・ ・ ・ ・ ・ 15
・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・22a,
22b, 22c, 22d, 22e, 22f alignment film layer sealant liquid crystal material segment electrode

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. The gap between the electrodes is 1
A liquid crystal device characterized in that the thickness is from μm to 5 μm.