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Liquid crystal aligning film, its preparation method, substrate and display device

A liquid crystal alignment film and substrate technology, applied in the direction of liquid crystal materials, chemical instruments and methods, instruments, etc., can solve problems such as easy reduction of process yield, static electricity residue, unevenness, etc., to avoid related defects, reduce water absorption, enhance The effect of translucency

Inactive Publication Date: 2020-08-04
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has a disadvantage: due to the characteristics of high polarity and high water absorption of ordinary polyimide materials, it is easy to cause the polyimide materials to deteriorate easily during storage or transportation, resulting in uneven alignment; Dust particles, static electricity residue, brush marks and other problems are also likely to reduce the process yield
Moreover, the polyimide alignment film currently used generally has poor transparency and insufficient light transmittance, which will affect the overall transmittance of the entire TFT-LCD panel.

Method used

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  • Liquid crystal aligning film, its preparation method, substrate and display device
  • Liquid crystal aligning film, its preparation method, substrate and display device
  • Liquid crystal aligning film, its preparation method, substrate and display device

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preparation example Construction

[0031] The embodiment of the present invention discloses a method for preparing a liquid crystal alignment film, comprising the following steps:

[0032] Dissolve dibasic acid anhydrides, diamines and silane coupling agents containing fluorine atoms in organic solvents for polymerization, then add C12-20 monoamines and continue the reaction. After the reaction, add fluorine-containing polysiloxane alkane to obtain a prepolymer polyamic acid solution;

[0033] The prepolymer polyamic acid is evenly coated on the substrate, and the prepolymer polyamic acid is heated to obtain a liquid crystal alignment film.

[0034] According to the present invention, first dissolve the dibasic acid anhydride, diamine and silane coupling agent containing fluorine atoms in an organic solvent, and then react, then add C12-20 monoamine to continue the reaction. After the reaction, add fluorine-containing Polysiloxane-like to obtain a prepolymer polyamic acid solution.

[0035] In the process of ...

Embodiment 1

[0050] (A) 120 grams of hexafluorodianhydride, 100 grams of 4,4-diaminodiphenyl ether and 0.221 grams of dimethyldimethoxysilane were dissolved in N-methylpyrrolidone, reacted at room temperature for 4 hours, and then Add 1 gram of dodecylamine and continue the reaction at room temperature. After 3 hours of reaction, add 5 grams of polytrifluoromethyltrimethylsilane to obtain a prepolymer polyamic acid solution with a solid content of 6%.

[0051] (B) Coating the prepolymer polyamic acid evenly on the substrate, first heating the prepolymer polyamic acid to 120° C. for 3 hours, and then heating to 250° C. for 3 hours to obtain a liquid crystal alignment film.

[0052] image 3 It is a synthetic route map of liquid crystal alignment film. Hexafluorodianhydride, 4,4-diaminodiphenyl ether and dodecylamine are polymerized to produce a polyamic acid solution, and the polyamic acid solution is dehydrated and cyclized to obtain a liquid crystal alignment film composed of polyimide. ...

Embodiment 2

[0058] (A) 130 grams of 4,4'-(2-(3'-trifluoromethyl-phenyl)-1,4-phenoxy)-phthalic anhydride, 100 grams of 4,4-diamino Diphenylmethane and 1.26 grams of dimethyldimethoxysilane were dissolved in N-methylpyrrolidone, reacted at room temperature for 4.5 hours, then added 2 grams of tetradecylamine, and continued to react at room temperature. After 3.5 hours of reaction, add 5 grams of fluorine-containing octamethylcyclotetrasiloxane to obtain a prepolymer polyamic acid solution with a solid content of 8%;

[0059] (B) Coating the prepolymer polyamic acid evenly on the substrate, first heating the prepolymer polyamic acid to 140° C. for 2.5 hours, and then heating to 280° C. for 2.5 hours to obtain a liquid crystal alignment film.

[0060] The adhesion of the prepared liquid crystal alignment film was tested by an adhesion tester, and the experimental results showed that the adhesion could exceed level 1.

[0061] The pre-tilt angle of the liquid crystal alignment film was tested...

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Abstract

The invention relates to the field of display devices, in particular to a liquid crystal alignment film, a preparation method thereof, a substrate and a display device. The liquid crystal alignment film is made of polyimide, and the polyimide is polymerized from dibasic acid anhydrides containing fluorine atoms, C12-20 monoamines and diamines. According to the preparation method of the present invention, the fluorine-containing group is introduced into the polyimide through the dibasic acid anhydride containing the fluorine atom, and the long flexible chain segment is introduced into the polyimide through the C12~20 monoamine; the long flexible chain and The introduction of fluorine-containing groups makes the pretilt angle of the synthesized polyimide reach 3°~5°, and the introduction of fluorine element makes the transmittance of the synthesized polyimide significantly improved, and the water absorption is reduced. The fluorine-containing long flexible chain polyimide material can be used in the liquid crystal alignment film of TFT‑LCD, which enhances the light transmittance, thermal stability, chemical stability, adhesion, etc. of the liquid crystal alignment film, and avoids the Related adverse effects caused by amine materials.

Description

technical field [0001] The invention relates to the technical field of display devices, in particular to a liquid crystal alignment film, a preparation method thereof, a substrate and a display device. Background technique [0002] In the field of thin film transistor liquid crystal display (TFT-LCD) technology, the alignment film coated on the color filter (CF) substrate and thin film transistor (TFT) substrate plays a role in controlling the alignment method of liquid crystal molecules. Since the interface between the liquid crystal and the alignment film has a strong force, after the applied voltage is removed, the liquid crystal molecules after changing the alignment direction will return to the original state by viscoelasticity. [0003] At present, the polymer materials used for LCD alignment film are usually polyimide (PI) type. Generally speaking, the thickness of alignment film of TFT-LCD is between Due to the thin thickness and the need to withstand rubbing orien...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10C08J5/18C08L79/08C08L83/08C08K5/549C09K19/56G02F1/1337
CPCC08G73/1017C08G73/1039C08G73/105C08G73/1075C08G73/1078C08J5/18C08J2379/08C08J2483/08C08K5/549C08L79/08C08L2201/08C08L2203/16C08L2203/20C09K19/56G02F1/133723C08L83/08C08G73/1067C08G73/1071G02F1/1303G02F1/133711C08G73/1057
Inventor 万彬黎敏熊强倪欢
Owner BOE TECH GRP CO LTD