JPS61239218A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To obtain the titled element having an uniformity and not having a defect and a good orientation property by coating a transparent electrode and a liquid crystal orientation film having a specific composition on counter surfaces of the substrates counter-disposed respectively. CONSTITUTION:The liquid crystal orientation films 4, 4' are stuck on the substrates 1, 1' composed of a glass etc. after forming 'NESA(R)' patterns 2, 2'. And then, the obtd. substrates 1, 1' are incorporated in a display panel using sealing materials 3, 3', and the liquid crystal 5 is enclosed into the display panel followed by sealing an inlet 5 for the liquid crystal. The liquid crystal orientation film 4, 4' are prepared by dissolving cadmium chloride and potassium hydrogen carbonate in a distilled water filled in the water tank, and by dropping a small amount of the benzene solution contg. a mixture of hexadecanedionic acid and arachidic acid on the surface of the water filled in the water tank, resulted in forming a film composed of the mixture of hexadecanedionic acid and arachidic acid on a horizontal surface of the water with a developer of benzene.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a liquid crystal display element, and particularly to an alignment film for aligning liquid crystal molecules.

[Summary of the invention]

The present invention provides a liquid crystal display element in which a transparent electrode and a liquid crystal alignment film are respectively adhered to the opposing surfaces of substrates arranged to face each other, and a liquid crystal is sealed between the substrates, wherein the alignment film is a long-chain alkyl dibasic acid. , or by spreading a mixture of a long-chain alkyl dibasic acid and a fatty acid on a water surface to form a film, and then depositing one or more of the films on a substrate, making it difficult to use conventional rubbing methods. It is possible to prevent scratches on the surface of the alignment film, uneven film thickness, peeling of the film, damage to the drive electrode, and the resulting poor alignment and quality deterioration of the display element.
Furthermore, it is possible to form an alignment film that is uniform, defect-free, and has good alignment properties, which is essential for oblique evaporation, and is expensive and highly mass-producible, making it possible to manufacture high-quality liquid crystal display elements. It is something.

[Conventional technology]

Conventionally, as the alignment film, a method of rubbing a coated film of an organic polymer material such as polyimide, or an oblique evaporation film of silicon oxide or the like has been used.

[Problem that the invention seeks to solve]

However, the former rubbing method causes problems such as poor alignment and quality deterioration due to scratches on the surface of the alignment film, nonuniform film thickness, peeling of the film, and damage to the drive electrode.

In addition, the latter oblique evaporation method requires an expensive vacuum device with low mass productivity, which poses a problem in terms of cost.

Therefore, in order to solve these conventional problems, the present invention aims to obtain a liquid crystal alignment film that is uniform, defect-free, has good alignment properties, and is low-cost and highly mass-producible.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides: In forming an alignment film, a long-chain alkyl dibasic acid or a mixture of a long-chain alkyl dibasic acid and a fatty acid is spread on the water surface to form a film. - An alignment film is formed by depositing one or more layers of the film on a substrate.

[For production]

The liquid crystal alignment film formed as described above is uniform, defect-free, and has good alignment. Furthermore, since no vacuum equipment is required, the cost is low and mass productivity is high. Therefore, an inexpensive and high-quality liquid crystal display element can be produced.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

Example 1 FIG. 1 shows a liquid crystal display element. After forming a Nesa pattern 2.2' on a glass or plastic substrate 1.11, a liquid crystal alignment film 4.4° is attached. Next, seal material 3.
3' to form a display panel, liquid crystal 5 was injected, and the injection port was sealed.

In order to deposit and form the liquid crystal alignment film 4S41 shown in FIG. 1, the following procedure was performed.

Fill the water tank with distilled water and add 0.3x10 cadmium chloride.
4 x 10-'m mol//% potassium bicarbonate
o l/l put in.

A mixture of hexadecanedioic acid HOCO (CI(2) + 4.I C0OH and toaraxic acid) is dissolved in benzene and a small amount is dropped onto the surface of the above water tank.The benzene acts as a developing agent, and the hexadecanedioic acid is dissolved on the water surface. A film of a mixture of and araxic acid is formed.

After the glass substrate with the NESA pattern formed thereon was subjected to hydrophobic treatment, it was moved in a direction perpendicular to the liquid surface as shown in Figure 2.
, ), a film (X film) that adhered only in the dipping process but not in the pulling process, and a film (Y film) that adhered in both the dipping and pulling processes were formed, respectively. In both cases, the liquid crystal was horizontally aligned without rubbing.

Furthermore, since the alignment film was uniform and defect-free, a high-quality liquid crystal display element with no alignment unevenness was obtained.

Example 2゜Example 1. Similarly, a mixed film of hexadecanedioic acid and alaxic acid is formed on the water surface.

After the glass substrate on which the NESA pattern has been formed is subjected to hydrophobic treatment, it is gently lowered onto the water surface with the NESA surface facing down, as shown in FIG.

Thereafter, it was pulled away from the liquid surface (as shown at 110). In this case as well, the liquid crystal showed good alignment.

Example 3゜Example 1. Similarly, a mixed film of hexadecanedioic acid and alaxic acid is formed on the water surface.

The plastic substrate on which the NESA pattern has been formed is wound around a cylinder with a horizontal axis as shown in FIG. 4, dipped slightly in water, and then rotated. In this way, an alignment film was attached to the surface of the substrate. In this case as well, the liquid crystal showed good alignment. 1 [Effects of the Invention] As explained above, the present invention uses a long-chain alkyl dibasic acid or a mixture of a long-chain alkyl dibasic acid and a fatty acid to form a liquid crystal alignment film that is a component of a liquid crystal display element. Because it is obtained by spreading the film on the water surface to form a film, and then attaching one or more layers of that film to the substrate, there are no scratches on the surface of the alignment film or the film thickness that would occur with the conventional rubbing method. It is possible to prevent unevenness, peeling of the film, damage to the drive electrode, and the resulting poor alignment and quality deterioration of the display element.Furthermore, since no vacuum equipment is required, it is possible to achieve uniformity at low cost and with high mass production. It is possible to form an alignment film that is free from defects and has good alignment properties, and has the effect of making it possible to manufacture high-quality liquid crystal display elements.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a liquid crystal display element, FIG. 2 is a schematic diagram showing a method for forming a liquid crystal alignment film by a dipping and pulling method, and FIG. 3 is a schematic diagram showing a method for forming a liquid crystal alignment film by a horizontal deposition method.
FIG. 4 is a schematic diagram showing a method of forming a liquid crystal alignment film by a rotating cylinder method. 1.11・・・・・・Board 2.2I・・・・・・ Nesa pattern 3.3I・
・・・・・・・・・ Sealing material 4.41・・・・・・・・・
・Liquid crystal alignment film 5・・・・・・・・・・・・・・・・・・
Liquid crystal 6・・・・・・・・・・・・・・・・・・Applicant: Seiko Electronics Co., Ltd. Eaves view of good quality display element Figure 1 Figure 3 Figure 34

Claims (2)

[Claims] (1) In a liquid crystal display element in which a transparent electrode and a liquid crystal alignment film are respectively adhered and formed on the opposing surfaces of substrates arranged to face each other, and liquid crystal is sealed between the substrates, the alignment film includes a long-chain alkyl dibasic acid, a long-chain alkyl dibasic acid, Alternatively, a liquid crystal display characterized in that it is obtained by spreading a mixture of a long-chain alkyl dibasic acid and a fatty acid on a water surface to form a film, and then depositing one or more layers of the film on a substrate. element. (2) The long-chain alkyl dibasic acid has the general formula HOCO (
CH_2)_nCOOH (where n=8 to 40) CH_2)_nCOOH (where n=8 to 40)
The liquid crystal display element described in item 1).