JPH04291236A - Production of liquid crystal device - Google Patents

Abstract

PURPOSE:To obviate the biasing in the distribution of gap materials by the static electricity generated during production and to uniformize the thickness of a liquid crystal layer by printing oriented films, then spraying the gap materials to fix the gap materials onto the oriented films, curing the films by baking and subjecting the films to a rubbing treatment. CONSTITUTION:A polyimide material for the oriented films is printed by a flexographic printing machine on transparent ITO electrodes 12a, 12b formed on soda glass 11a, 11b. High-polymers having 6mum grain size are printed as the gap agents 16a to 16e and are sprayed on the oriented films and dispersed on the oriented films. The substrates are calcined to cure the oriented film layers. The gap materials are fixed to the oriented film layers and the biasing of the gap materials by the static electricity generated during the process does not arise. After the layers are subjected to the orientation treatment by a rubbing cloth, the liquid crystal display device is produced by using such substrates. The production process for fixing these gap materials to the oriented film layers is effective regardless of the kinds of the liquid crystal materials.

Description

[Detailed description of the invention]

0001

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

0002

[Prior Art] Conventionally, a segment electrode 21a shown in FIG.
, 21b, 21c and 22a, 22b, 22c are patterned on the substrate 23, and the common electrode 31a shown in FIG.
A substrate 32 on which patterns 31b, 31c, 31d, 31e, and 31f have been patterned is placed so that its electrodes face each other as shown in FIG. The area where the segment electrode and the common electrode intersect is an area where information is displayed and is called a pixel, and image information is displayed by selectively applying a voltage to the area. In this case, the case has been described in which there are three segment electrodes each on the upper and lower sides and six common electrodes, but the number is arbitrary.

0003

[Problems to be Solved by the Invention] However, in the substrates on which alignment films used in conventional liquid crystal devices are formed, static electricity generated during manufacturing causes uneven distribution of the gap agent, causing problems between the pair of substrates. There was a problem in that the gaps became non-uniform, color unevenness occurred in the liquid crystal display device, and display quality deteriorated.

FIG. 5 is a cross-sectional view of a conventional liquid crystal device in which the gap agent distribution is uneven, and 51a and 51b are a pair of substrates, a segment electrode substrate and a common electrode substrate. On these substrates, on transparent electrode layers 52a and 52b,
Alignment film layers 53a and 53b are formed. 54a, 5
4b is a sealing agent for sealing the liquid crystal 55. Gap agents 56a, 56b, 56c, 56d, and 56e are uniformly sprayed to keep the gap between the pair of substrates constant. These gap agents are sprayed onto one of the substrates after the alignment film layer is printed and cured by baking, and after the two substrates are bonded together with a sealant, liquid crystal is injected.

However, after the gap agent is sprayed until the substrates are bonded together with the sealant, the distribution of the sprayed gap agent becomes uneven due to static electricity from the outside, and as shown in FIG. There was a problem in that the gap was not constant, which caused the thickness of the liquid crystal to be inconsistent, resulting in color unevenness in the liquid crystal device. Therefore, an object of the present invention is to prevent the sprayed gap agent from being affected by static electricity generated during the process, in order to solve such conventional problems.

[0006]

[Means for Solving the Problems] In order to solve the above problems, the present invention prints an alignment film, then sprays a gap agent, fixes the gap agent on the alignment film, and then bakes and hardens the alignment film. , and a rubbing process.

[0007]

[Function] In the method for manufacturing a liquid crystal device configured as described above, the gap agent is fixed on the printed alignment film, so the gap agent is no longer affected by static electricity, and therefore the gap agent is not biased. It will no longer occur.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. In FIG. 1, 11a and 11b are glass,
Transparent substrates made of plastic; 12a, 12b are transparent electrode layers; 13a, 13b are alignment film layers; 14a, 14b are sealants for sealing the liquid crystal 15; 16a, 1
6b, 16c, 16d, and 16e are gap agents.

In this embodiment, a polyimide material was used as the alignment film material. Specifically, Chisso PSI-20
01-A was printed on an ITO transparent electrode layer formed on soda glass using a flexo printing machine. The thickness of the alignment film layer is 500 Å. Next, as a gap agent, the particle size is 6μ.
A high molecular weight polymer of m was sprayed onto the printed alignment film. The substrate was then baked at 200° C. for 2 hours to harden the alignment film layer. At this time, the gap agent was fixed to the alignment film layer, and the gap agent was not shifted even by static electricity generated during the process. Next, after alignment treatment was performed using a rubbing cloth, the liquid crystal device shown in FIG. 1 was manufactured using these substrates.

[0010] Regardless of the material, thickness, and size of the alignment film material, glass material, and gap agent, static electricity was reduced and similar effects were obtained. In the rubbing process, when the rubbing density was increased, the gap agent peeled off from the substrate, but there was no problem at a normal processing density. In this embodiment, a case has been described in which there are three segment electrodes each on the upper and lower sides and six common electrodes, but there is no limit to the number of segment electrodes.

Regarding liquid crystal devices, as long as the device uses a gap agent to control the gap between the liquid crystal layers, such as twisted nematic type, super twisted type, or homeotropic type, the same effect can be achieved regardless of the type of liquid crystal material. It worked.

0012

[Effects of the Invention] As explained above, the present invention starts from the step of printing an alignment film, spraying a gap agent, fixing the gap agent on the alignment film, baking and hardening the alignment film, and performing a rubbing treatment. This structure has the effect of eliminating uneven distribution of the gap agent due to static electricity generated during manufacturing.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the structure of a liquid crystal device according to the method of manufacturing a liquid crystal device of the present invention.

FIG. 2 is a plan view of a segment electrode substrate of a conventional liquid crystal device.

FIG. 3 is a plan view of a common electrode substrate of a conventional liquid crystal device.

FIG. 4 is a plan view showing the structure of an electrode of a conventional liquid crystal device.

FIG. 5 is a cross-sectional view of a conventional liquid crystal device.

[Explanation of symbols]

11a, 11b Transparent substrate 12a, 12b Transparent electrode layer 13a, 13b alignment film layer 14a, 14b Sealant

Claims (1)

[Claims] 1. In a liquid crystal device in which a gap agent and liquid crystal are sandwiched between two substrates each having a transparent electrode on a substrate and an alignment film on the electrode, after printing the alignment film, the gap agent A method for manufacturing a liquid crystal device, comprising the steps of: fixing a gap agent on the alignment film; baking and hardening the alignment film; and subjecting the alignment film to a rubbing treatment.