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Material for liquid crystal vertical alignment film, liquid crystal cell prepared therefrom, and preparation method

A technology of vertical orientation and liquid crystal cells, which is applied in the direction of liquid crystal materials, chemical instruments and methods, instruments, etc., can solve the problems of increasing manufacturing costs, expensive raw material steps, etc., and achieve the goals of ensuring polymerization speed, easy preparation, and reducing light irradiation Effect

Active Publication Date: 2020-12-29
成都海亿科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the patent of Yukishi Kashishita, etc., the polymerization of the polymerizable monomer plays a role in controlling the azimuth angle of the liquid crystal molecules, and the pretilt angle is close to 90° (that is, the angle between the long axis direction of the liquid crystal molecules and the alignment layer) The realization of diamines requires the help of diamines with special structures with long side chains, and the synthesis of these diamines requires expensive raw materials and complicated steps, which will significantly increase the manufacturing cost

Method used

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  • Material for liquid crystal vertical alignment film, liquid crystal cell prepared therefrom, and preparation method
  • Material for liquid crystal vertical alignment film, liquid crystal cell prepared therefrom, and preparation method
  • Material for liquid crystal vertical alignment film, liquid crystal cell prepared therefrom, and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1.1 Preparation of photosensitive polyimide

[0035] 96.7g (0.3mol) of 3,3',4,4'-benzophenone tetracarboxylic dianhydride and 67.9g (0.3mol) of 3,3'-dimethyl-4,4'-diaminodiphenylmethane ) was dissolved in 658.3 g of N-methyl-2-pyrrolidone (NMP), and reacted at 25° C. for 6 h in a nitrogen atmosphere to obtain a polyamic acid solution. After the reaction, add NMP to dilute to a solid content of 5%.

[0036] Clean the glass substrate with lye, detergent solution, water and isopropanol in sequence. After drying, spin-coat the above polyamic acid solution on the glass substrate and perform thermal imidization on a heating plate. The heating conditions For: 80°C / 30min, 250°C / 1h. After the heating is completed, it is naturally cooled for standby and named as PI-1.

[0037] 1.2 Preparation of liquid crystal cells

[0038] The above-mentioned glass substrate coated with photosensitive polyimide was subjected to rubbing treatment. Two pieces of glass substrates were bonded ...

Embodiment 2

[0042] 2.1 Preparation of photosensitive polyimide

[0043] The photosensitive polyimide in Example 1, namely PI-1, was used.

[0044] 2.2 Preparation of liquid crystal cells

[0045] The above-mentioned glass substrate coated with photosensitive polyimide was subjected to rubbing treatment. Two pieces of glass substrates were bonded with photocurable adhesive containing 40 μm spacers, with the sides coated with photosensitive polyimide facing each other, and bonded in anti-parallel rubbing direction to form a box. 98 parts of liquid crystal and 2 parts of butyl acrylate were stirred at room temperature for 12 hours to fully mix the two to obtain a liquid crystal blend containing 2% of butyl acrylate. The above-mentioned liquid crystal blend in isotropic state is poured into the liquid crystal cell by capillary method, and then sealed with photocurable glue.

[0046] 2.3 Lighting

[0047] The illumination mode is consistent with that in Example 1.

Embodiment 3

[0049] 3.1 Preparation of photosensitive polyimide

[0050] The photosensitive polyimide in Example 1, namely PI-1, was used.

[0051] 3.2 Preparation of liquid crystal cell

[0052] The above-mentioned glass substrate coated with photosensitive polyimide was subjected to rubbing treatment. Two pieces of glass substrates were bonded with photocurable adhesive containing 40 μm spacers, with the sides coated with photosensitive polyimide facing each other, and bonded in anti-parallel rubbing direction to form a box. 99 parts of liquid crystal and 1 part of isooctyl acrylate were stirred at room temperature for 12 hours to fully mix the two to obtain a liquid crystal blend containing 1% of isooctyl acrylate. The above-mentioned liquid crystal blend in isotropic state is poured into the liquid crystal cell by capillary method, and then sealed with photocurable glue.

[0053] 3.3 Lighting

[0054] The illumination mode is consistent with that in Example 1.

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Abstract

The invention discloses a material for a liquid crystal vertically aligned film, a liquid crystal box prepared from the material and a preparation method of the material. In order to provide high vertical alignment property, a polymer sustained vertical alignment (PSVA) mode is adopted; the liquid crystal box is prepared from a substrate coated with straight chain type photosensitive polyimide and is filled with liquid crystals containing (methyl) alkyl acrylate; the straight chain type photosensitive polyimide with a simple molecular structure is used as an initiator; under the irradiation of ultraviolet light, the straight chain type photosensitive polyimide initiates the (methyl) alkyl acrylate to be polymerized, namely obtaining the liquid crystal vertically aligned box. The photosensitive polyimide is formed by polycondensing diphenyl ketone-containing dianhydride and active hydrogen-containing diamine; the number of alkyl carbons of the (methyl) alkyl acrylate is equal to 4 to 18. The liquid crystal vertically aligned film and the liquid crystal box which are disclosed by the invention has the advantages of simple preparation process, low production cost, high liquid crystal alignment performance and the like.

Description

technical field [0001] The invention relates to a liquid crystal alignment film material for a liquid crystal display element in a polymer sustained vertical alignment (polymer sustained vertical alignment, PSVA) mode, as well as a liquid crystal cell prepared therefrom and a preparation method of the liquid crystal cell. Background technique [0002] Liquid crystal displays (LCDs) have the advantages of low power consumption, high contrast ratio, and fast response, and are currently the most widely used displays. There are many display modes of LCDs, among which the vertical alignment (VA) mode has been extensively studied for its high contrast ratio, wide viewing angle, high cost performance and wide application range. The multi-domain vertical alignment (MVA) in the VA mode produces protrusions on the vertically aligned electrodes, which will lead to a decrease in the transmittance of LCDs, and at the same time due to the alignment direction (azimuth angle) of the liquid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/56G02F1/1337C08J7/18C08G73/10C08J5/18C08L79/08
CPCC08G73/1067C08J5/18C08J7/18C08J2379/08C09K19/56G02F1/133723
Inventor 汪映寒王飞
Owner 成都海亿科技有限公司