JPH04293016A - Liquid crystal device - Google Patents

Abstract

PURPOSE:To prevent one-sided distribution of spacers due to static electricity caused during manufacture by specifying an amount of spacers to be added and heat treating orienting films containing the spacers to fix them. CONSTITUTION:The polymer spacers 16a-16e of 6mum diameter are added into the orienting film material of polyimide are printed by flexopaphic press on ITO transparent electrode layers 12a, 12b formed on soda glasses 11a, 11b. The thickness of each of the orienting films 13a, 13b is 50nm, and an amount of spacers 16a-16e to be added is controlled to 100permm<2> of the printed orienting films 13a, 13b, and the soda glass substrates 11a, 11b are heat treated at 200 deg.C for 2 hours to harden the orienting films and to fix the spacers 16a-16e to the orienting films 13a, 13b, thus preventing the spacers from becoming one-sidedly distributed by static electricity occurring during the manufacture. The orienting films 13a, 13b are subjected to orienting treatment by rubbing them with rubbing cloths.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention relates to computer terminals,
Electro-optical devices using liquid crystals used in systems such as image display devices and shutters.

0002

2. Description of the Related Art Conventionally, as shown in FIG.
21b, 21c and 22a, 22b, 22c are the substrate 23 patterned with segment electrodes, and as shown in FIG.
The substrate 32 on which the common electrode is patterned is placed so that the 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, 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, alignment film layers 53a and 53b are formed on transparent electrode layers 52a and 52b. 54a
, 54b 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 the gap between the substrates becomes constant as shown in Figure 5. This caused the problem that the thickness of the liquid crystal was not constant and color unevenness occurred in the liquid crystal device.

SUMMARY OF THE INVENTION Therefore, in order to solve these conventional problems, it is an object of the present invention to provide a liquid crystal display device in which a sprayed gap agent is not affected by static electricity generated during the process. be.

[0006]

[Means for Solving the Problems] In order to solve the above problems, the present invention includes a gap agent added to the alignment film material.

[0007]

[Operation] In the liquid crystal device constructed as described above, since the gap agent is fixed on the printed alignment film, the gap agent is no longer affected by static electricity, and therefore the gap agent does not shift to one side.

[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 with a particle size of 6 as a gap agent.
A high molecular weight polymer of μm was added. Next, a flexographic printing machine printed on the ITO transparent electrode layer formed on the soda glass. The thickness of the alignment film layer is 500 angstroms. The amount of gap agent added was set to 100 per square millimeter in the state in which the alignment film was printed. 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. There is no limit to the number of segment electrodes and common electrodes in this embodiment.

Regarding liquid crystal devices, if the liquid crystal 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 obtained regardless of the type of liquid crystal material. was gotten.

0012

[Effects of the Invention] As explained above, this invention has a configuration in which a gap agent is added to the alignment film material, so that the distribution of the gap agent is prevented from being unevenly distributed due to static electricity generated during manufacturing. It has the effect of disappearing.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the structure of a liquid crystal device according to the method for manufacturing a liquid crystal device of the present invention.

FIG. 2 is an explanatory diagram showing a segment electrode substrate of a conventional liquid crystal device.

FIG. 3 is an explanatory diagram showing a common electrode substrate of a conventional liquid crystal device.

FIG. 4 is an explanatory diagram showing the structure of an electrode of a conventional liquid crystal device.

FIG. 5 is an explanatory diagram showing a cross section 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 a liquid crystal are sandwiched between two substrates each having a transparent electrode on a substrate and an alignment film on the electrode, the gap agent is added to the alignment film material. A liquid crystal device characterized by: