JPH03260627A - Liquid crystal device - Google Patents

Abstract

PURPOSE:To prevent the generation of static electricity during a rubbing treatment by providing conductive layers having 1X10<10> to 1X10<13> OMEGAcm resistance value on substrates and under electrode layers. CONSTITUTION:The liquid crystal device which is constituted by providing the transparent electrode layers 12 respectively on substrates 11a, 11b and further, providing the oriented film layers 13 thereon and crimping a liquid crystal layer between these substrates 11a and 11b is provided with the conductive layers 16 having 1X10<10> to 1X10<13> OMEGAcm resistance value on the substrates 11b and under the electrode layers 12. The electric charges generated by the rubbing treatment are gradually discharged via these conductive layers 16 and, therefore, the generation of static electricity is obviated and the oriented films are not broken. The liquid crystal device which is free from unequal display is thus obtd.

Description

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

[V1 essentials of the invention] In a liquid crystal device in which a liquid crystal is sandwiched between a pair of substrates having a transparent electrode layer on the substrate and an alignment film layer on the electrode layer, a resistance value of 1× is provided on the substrate and under the electrode layer. 1Q IQΩan to l
By providing the conductive layer marked with Xl0''Ω, the purpose is to prevent destruction of the alignment film layer due to static electricity and to obtain a liquid crystal device with high display quality.

[Prior Art] As a dot matrix type display device, a liquid crystal display device is attracting attention because it is thin, lightweight, and has 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. Figure 2+a+ is a diagram explaining the structure of the electrodes of a liquid crystal device, in which 21a, 21a,
21b, 21c, and 22a, 22b, 22c are data signal electrodes (segment electrodes) in the liquid crystal device, and 23a, 23b, 23c, 23d, 23e.
, 23f is a scanning signal electrode (common electrode), and the segment electrode 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. 2 (bl is a diagram showing the substrate on the segment electrode side. When the substrate is rubbed with a cloth or the like, charges accumulate on the electrodes, between 21a and 22a, between 21b and 22b, and between 21a and 22b.
A discharge of ft load occurs between 1c and 22a. The result 24
a, 24b, 24c, 24d, 24e,
The alignment film layer is destroyed as shown in 24f.

FIG. 2 fcl is a diagram when 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. 25a, 2
In the regions 5b, 25c, 25d, 25B, and 25f, 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 for Solving the Problems] In order to solve the above problems, the present invention provides a liquid crystal device in which a liquid crystal is sandwiched between a pair of substrates, each having a transparent electrode layer on the substrate and an alignment film layer on the electrode layer. , a conductive layer having a resistance value of 1×lO10Ω1 to 1×10”Ωω is provided on the substrate and below the electrode layer.

[Function] Conventionally, when the resistance of the alignment film is high, when the substrate is rubbed with cloth etc., charges accumulate in the electrode layer, as shown in Figure 2 (2 in BL).
Charges are discharged all at once through the alignment film layer between 1a and 22a, between 21b and 22b, and between 21G and 22G, but by providing the conductive layer as described above, the charges are gradually discharged through this layer. This method takes advantage of the fact that the alignment film will not be destroyed because of this.

[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 a substrate made of glass, plastic, etc., and has segment electrode layers 12a, 12b and a common electrode 12 on its surface.
c, alignment film layers 13a and 13b are provided.

The pair of 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. Reference numeral 16 denotes a conductive layer of the present invention, the resistance value of which is from lXl0IOΩ1 to lXl0''ΩC-.

16a and 16b in the figure are silicon dioxide (SiOl) to which fine carbon particles are added.

The thickness of the layer is 0.1 μm or more.

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

Regarding the resistance value of the layer, if it is less than lXl015Ωl, it will not be effective, and if it is less than lXl010Ωc, it will cause a short circuit between adjacent electrodes on the substrate. Therefore, 1×10” ΩC111 to 1×10 3 Ωcca is preferable.

Moreover, the thickness is not limited as long as it is 0.1 μm or more, and the same effect can be obtained.

In this example, fine carbon particles were added to silicon dioxide, but any material may be used as long as the resistance value of the film is within a predetermined value.

In this example, carbon powder was added, but when forming an alignment film at high temperatures, the same effect can be obtained as long as the material is not denatured. Specifically, when forming a polyimide-based alignment film, after applying the alignment film material, the heating temperature is from 180°C to 35°C.
Although the film is fired at 0° C., any film material that does not undergo denaturation at this temperature may be used.

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, the transparent electrode layer is provided on the substrate, and the orientation F! is provided on the electrode layer. ! In a liquid crystal device in which a liquid crystal is sandwiched between a pair of substrates provided with layers, by providing a conductive layer with a resistance value of lXl010Ω to lXl0I3Ω on the substrate and below the electrode layer, it is possible to prevent destruction of the alignment film layer due to static electricity. It is now possible to obtain a liquid crystal device with high display quality.

Figure 1 is a sectional view of the liquid crystal device of the present invention, Figure 2 +a+ to f
ci is a schematic diagram showing the effect of the present invention.

11a, llb...Substrate 12a, 12
b...Segment electrode layer 12c...
...Common electrode layers 13a, 13b...
Alignment film layers 14a, 14b... Sealing agent 15... Liquid crystal material 16a... Conductive layer of the present invention or more

Claims (1)

[Claims] In a liquid crystal device in which a liquid crystal is sandwiched between a pair of substrates having a transparent electrode layer on the substrate and an alignment film layer on the electrode layer, a resistance value of 1×10^1 is provided on the substrate and below the electrode layer. ^
A liquid crystal device characterized in that a conductive layer of 0 Ωcm to 1×10^1^3 Ωcm is provided.