JPS63192018A - Production of liquid crystal element - Google Patents

Abstract

PURPOSE:To obtain a liquid crystal display element having high display quality without spraying a spacer material or with spraying of merely a small amt. of said material by using such spacers, the pressure of which is not exerted to parts except a peripheral sealing part, to adhere substrates. CONSTITUTION:The substrates 12 having plural transparent electrodes insulated from each other are prepd. and after liquid crystal orientation films are provided on electrode surfaces, the peripheral sealing material 13 consisting of an epoxy resin contg. glass fibers is printed on one side of the transparent electrode substrates 12. High-polymer powders are sprayed at 50 pieces/mm<2> on one side thereof and thereafter, the substrates 12 are combined and are sandwiched by spacers 11 made of paper cut to the shape of the sealing part. The substrates are heated while pressure is applied thereto from above and below to adhere the substrates. A uniform cell thickness is thereby obtd. even if the amt. of the high polymer powders sprayed within the image plane is small. The liquid crystal display element which decreases the defects of the picture element faces, has the good display quality and decreases generation of disclination is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is used in II image display devices, liquid crystal display elements used in computer terminals, etc., liquid crystal shutters used in printers, etc. The present invention relates to a method for manufacturing a liquid crystal element.

[Summary of the invention]

The present invention is applicable to three-image display devices, liquid crystal display elements used in computer terminals, and liquid crystal shutters used in printers and the like. In the manufacturing method of liquid crystal elements, by using a spacer that prevents pressure from being applied to areas other than the peripheral sealing area during cell compression, even if there is little spacer material in one screen, the cell thickness is uniform and there are fewer defects in the 9 pixels. To provide a liquid crystal display element with high display quality, and also to provide a manufacturing method capable of manufacturing a liquid crystal element with a uniform cell thickness for use in a liquid crystal shutter for a printer in which it is not possible to spread a spacer agent within the nine screens in N days. be.

[Conventional technology]

In recent years, liquid crystal display elements have become significantly larger and have a higher capacity9.
Screens are also becoming larger. This makes it difficult to manufacture all nine screens with a uniform film thickness, and glass fiber or a large amount of polymer powder is spread within the Wi plane. Also.

If there is a spacer in the plane, it will be a drawback when printing.It is difficult to make the printer shutter large, so v
Scanning is performed using an A-shaped elongated element.

[Problem that the invention seeks to solve]

However, in large liquid crystal display elements.

Because a large amount of spacer agent must be spread within the pixel plane,
This area became a drawback, resulting in a decrease in aperture ratio and deterioration of display quality, and also disclination occurred with the spacer agent as a core, resulting in significant deterioration of display quality.

In addition, in the case of liquid crystal shanks used in printers, etc., if there is a spacer agent within 9 planes, this becomes a drawback, and it is not possible to spread the spacer agent within 1 plane, so it is necessary to increase the size of 5 screens. It is difficult to print, and printing is performed using line-sequential scanning, which poses a problem in that it takes a long time to print.

[Means for solving problems]

Therefore, one aspect of the present invention is that when bonding the electrode substrate using a peripheral sealing agent, by using a spacer that prevents pressure from reaching areas other than the peripheral sealing part, the spacer agent is not sprayed or only a small amount is sprayed. Liquid crystal display elements with high display quality in a convenient way.

This makes it possible to manufacture shutters for large-area liquid crystal printers.

〔Example〕

Next, an embodiment of the present invention will be described in detail using two drawings.

FIG. 1 is a conceptual diagram showing a spacer used in a compression bonding process and its relationship with a cell during the manufacture of a liquid crystal element according to the present invention. First, a substrate 12 having a plurality of mutually insulated transparent electrodes is prepared, and after providing a liquid crystal alignment film that has been subjected to alignment treatment to form an angle of 200° on the electrode surface, one of the transparent electrode substrates is prepared.

A peripheral sealant (13) of epoxy resin mixed with glass fibers having a diameter of 6.5 μm was printed on one side. 5 polymer powders with a diameter of 7.0 μm are placed on one side of the above transparent electrode substrate.
After being dispersed at a density of 0 pieces/mnl, they were sandwiched between spacers (11) made of combination 9 paper cut out in the shape of a sealing part, and heated while applying pressure from above and below to be bonded. Although the liquid crystal cell manufactured as described above has a small amount of polymer powder dispersed within one screen (generally 200 particles/m
m), resulting in a uniform cell thickness. Using the above cell, a nematic liquid crystal mixture having a ratio of the thickness d (μm) of the liquid crystal layer to the thickness p of the twisted film structure, d/p=0.65, was sealed to form a liquid crystal display element. With the above element in between, the angle between the transmission axis or absorption axis of the pair of polarizing plates and the alignment direction of the liquid crystal molecules near the interface is 45''±30, respectively.
Two display elements were formed by arranging them at an angle of 135°±30″ or 135°±30″.

Since the liquid crystal display element has a small amount of spacer material within one pixel surface, there are few defects on the pixel surface and the display quality is good.

It was confirmed that this is an electric field controlled birefringence effect type liquid crystal display element with little disclination.

Next, we used hard glass with a thickness of 2 dragons, and the effective display surface was 180 mm.
We prototyped a liquid crystal shutter for printers with a size of 1n x 260mm. The above shutter has a light absorption layer on one side and an A1 layer as a reflective film that also serves as an electrode, and a transparent electrode substrate on the other side, without spraying a spacer agent within one screen.
A cell was fabricated by pressure bonding in the same manner as in Example 1 using a peripheral sealing agent mixed with glass fibers having a diameter of 12.5 μm. In the above cell, 1% optically active substance (CB manufactured by Merck) was added.
A smectic A liquid crystal mixture mixed with -15) was sealed to prepare a shank for a liquid crystal printer.

Even though the above-mentioned shutter has a large area.

Because the cell thickness is uniform and there is no spacer material within the pixel plane, it was confirmed that this liquid crystal element can be used in a liquid crystal page printer that can print on 85-size paper at once without 5 defects when printing.

The spacer agent mixed into the peripheral sealant used during the manufacturing of the liquid crystal element is made from glass fiber.

It was confirmed that similar effects can be obtained even if the material is changed to silicon oxide spheres, metal oxide powder, or polymer spheres. Similarly, regarding the spacer agent dispersed within the screen used in Example 1, the polymer powder may be changed to glass fiber, silicon oxide spheres, or metal oxide powder.

The same effect can be obtained even if the spacer (11) used in manufacturing the liquid crystal element is changed from one made of paper to one made of cloth, metal, plastic, or a composite material thereof.

〔Effect of the invention〕

As explained above, according to the present invention, the cell thickness is uniform even though there is no spacer agent in one pixel plane or there is very little spacer agent in one pixel plane by a simple method, and there are few defects.
High-quality liquid crystal elements can be manufactured.

[Brief explanation of the drawing]

11... Spacer 12... Electrode substrate 13...Sealing agent that's all

Claims (6)

[Claims] (1) In a method for manufacturing a liquid crystal element in which a liquid crystal layer is sandwiched between a pair of electrode substrates arranged opposite to each other, the gap between the electrode substrates is controlled and the pair of substrates are bonded together by processing the substrates. A method for manufacturing a liquid crystal element, comprising using a spacer shaped so that pressure does not reach areas other than the seal portion when curing the peripheral seal. (2) The liquid crystal composition used in the liquid crystal element has positive dielectric anisotropy and is a nematic liquid crystal mixture to which an optically active substance is added. A method for manufacturing a liquid crystal element. (3) The liquid crystal composition used in the liquid crystal element is a liquid crystal mixture that takes a smectic A or chiral smectic C phase at room temperature.
A method for manufacturing a liquid crystal element as described in Section 1. (4) The peripheral sealant used for the liquid crystal element is characterized by being mixed with glass fibers of uniform diameter, silicon oxide spheres, polymer powder, or metal oxide powder, A method for manufacturing a liquid crystal element according to claim 1. (5) Claims characterized in that the liquid crystal element has glass fibers of uniform diameter, silicon oxide spheres, polymer powder, or metal oxide powder dispersed within the pixel plane. 2. The method for manufacturing a liquid crystal element according to item 1. (6) In the method for manufacturing a liquid crystal element, the spacer used during crimping is made of paper, cloth, metal, plastic, or a composite material thereof. A method for manufacturing a liquid crystal element according to claim 1.