JPH03239219A - Production of liquid crystal device - Google Patents

Abstract

PURPOSE:To prevent generation of static electricity during a rubbing treatment by subjecting a substrate surface to the rubbing treatment while humidifying the substrate at the time of subjecting an oriented film to an orientation treatment. CONSTITUTION:An electrode layer 12 and the oriented film layer 13 are installed on the surface of the substrate 11 and the surface is rubbed in a 16 direction while a roll 14 is rotated in a 15 direction. Static electricity is generated at the time when the roll 14 rubs the oriented film layer 13. The phenomenon that the quantity of the static electricity decreases when the humidity of the environment is increased, thereupon, is utilized. Namely, the rubbing treatment is executed by immersing a fixing base 17 for the substrate 11 into pure water. The breakdown of the oriented film 13 by the static electricity is prevented in this way and the liquid crystal having the high display quality is obtd.

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] In a liquid crystal device in which a liquid crystal is sandwiched between a pair of substrates each having a transparent electrode on the substrate and an alignment film on the electrode, the step of aligning the alignment film involves immersing the substrate in pure water. However, by performing a rubbing treatment on the substrate surface, the aim is to prevent destruction of the alignment film 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 fal 21a, 21b, 21. c, and 22a, 2
2b and 22c are data signal electrodes (segment electrodes) in the liquid crystal display device, and 23a, 23b and 23c are scanning signal electrodes (common electrodes), and the segment electrodes and the common electrodes 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(b) 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 21a and 22a, between 21b and 22b, and between 21
Charge discharge occurs between c and 22c. The results are shown in Figure 2 (
24a, 24b, 24c, 24d of C1,
The alignment film layer is destroyed as shown in 24e and 24f.

FIG. 2 +d+ 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
5b, 25c, 25d, 25e, 25f
In this 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 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 on the substrate and an alignment film on the electrode. The method is characterized in that the step of orienting the film includes a step of rubbing the surface of the substrate while humidifying the substrate.

[Effect] The operation of the present invention will be explained below based on FIG.

In Figure 1, 11 is a substrate with an electrode layer 12 and an alignment film layer 13 on the surface.
is installed. 14 is a roll for performing orientation treatment. This roll performs rubbing while rotating in the direction of arrow 15. 16 is the direction in which the roll moves. 1
7 is a stand for fixing the substrate.

18 is pure water. When the roll rubs against the alignment layer, static electricity is generated.

The present invention utilizes the fact that when the humidity of the environment in which the object to be rubbed is placed is high, the amount of static electricity generated is small.

[Example 1] When performing the rubbing treatment shown in FIG. 1, the table 17 for fixing the substrate to be rubbed was immersed in pure water, and the rubbing treatment was performed.

When a liquid crystal device was constructed in the same manner as in Example 1, a liquid crystal device with no display unevenness was obtained.

Although the temperature of the pure water used was varied from 20°C to 70°C, similar effects were obtained.

[Example 21] When performing the rubbing process shown in FIG. 1, the table 17 for fixing the substrate to be rubbed was immersed in ethanol instead of pure water, and the rubbing process was performed.

When a liquid crystal device was constructed in the same manner as in Example 1, a liquid crystal device with no display unevenness was obtained.

Although the rubbing cloth used in Examples L was made of polymeric fibers such as polyester and nylon, static electricity was reduced regardless of the material, and similar effects were obtained.

Regarding liquid crystal devices, similar effects were obtained with liquid crystal devices that undergo rubbing treatment, such as twisted nematic type, super rice type, which performs horizontal alignment, and homeotropic type, which performs vertical alignment.

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, in a liquid crystal device in which a liquid crystal is sandwiched between a pair of substrates in which a transparent electrode is provided on a substrate and an alignment film is provided on electrode -F, an alignment film is provided on the substrate. Since the alignment process involves rubbing the substrate surface while immersing the substrate in pure water, it is possible to prevent destruction of the alignment film due to static electricity and obtain a liquid crystal device with high display quality. Now you can.

[Brief explanation of drawings]

Figure 1 is a schematic diagram explaining the manufacturing method of the present invention, Figure 2 (
al, fbl, tel, (d+ is a schematic diagram showing a conventional manufacturing method. 11... Substrate 12... Electrode layer 13... Orientation film layer 14...Roll 15 for performing orientation treatment
...Rotation direction of the roll 16...
・Roll moving direction 17...Table for fixing the board 18...Pure water or higher

Claims (1)

[Claims] In a liquid crystal device in which a liquid crystal is sandwiched between a pair of substrates each having a transparent electrode on the substrate and an alignment film on the electrode, the step of aligning the alignment film is performed by immersing the substrate in pure water while A method for manufacturing a liquid crystal device, comprising a step of rubbing the surface of a substrate.