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Liquid crystal orientation film and preparation method thereof, and liquid crystal display device comprising orientation film

A technology of liquid crystal display device and liquid crystal alignment film, which is applied in the direction of liquid crystal materials, chemical instruments and methods, coatings, etc., which can solve the problems of liquid crystal display display quality degradation, liquid crystal display contrast reduction, and inconsistent arrangement directions, etc., to achieve reduction Effects of π-π mutual attraction, improvement of uniformity, and improvement of contrast

Inactive Publication Date: 2012-10-03
BEIJING BOE OPTOELECTRONCIS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, increasing the specific gravity or volume of aromatics in the polyimide main chain or embedding long alkane side chains is used to strengthen the orientation force of the alignment film on the liquid crystal molecules, because the traditional polyimide main chain is not completely linear Therefore, simply increasing the specific gravity or volume of aromatic hydrocarbons to enhance the alignment effect of the alignment film on liquid crystal molecules will lead to too strong π-π interactions between polyimide chains, making the polyimide main chains combine with each other Together, the liquid crystal molecules adsorbed on the surface of the polyimide alignment film have different twist angles in different regions of the polyimide main chain, resulting in the arrangement of liquid crystal molecules 5 in different regions of the polyimide main chain 4. Inconsistent (formed as image 3 In the case shown), the orientation and uniform arrangement of the liquid crystal molecules cannot be well realized, resulting in a decrease in the contrast of the liquid crystal display, thereby causing a decrease in the display quality of the liquid crystal display

Method used

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  • Liquid crystal orientation film and preparation method thereof, and liquid crystal display device comprising orientation film
  • Liquid crystal orientation film and preparation method thereof, and liquid crystal display device comprising orientation film
  • Liquid crystal orientation film and preparation method thereof, and liquid crystal display device comprising orientation film

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preparation example Construction

[0051] The present invention further provides a method for preparing the above-mentioned liquid crystal alignment film, comprising the following steps:

[0052] 1) under the protection of nitrogen, the compound shown in formula 2 or formula 3 and the aromatic diamine of formula 1 are mixed and stirred in a solvent for 24 hours to obtain polyimide acid;

[0053] h 2 N-Ar-NH 2 Formula 1

[0054] Formula 2 Formula 3

[0055] 2) Coating the polyimide acid evenly on the substrate, first heating at 80-100°C for 1h, evaporating part of the solvent, cyclizing part of the polyimide acid, and then heating at 210-240°C for 1h to obtain this Invented liquid crystal alignment film.

[0056] Wherein, the compound represented by formula 2 or formula 3 in step 1) is the same as the compound represented by formula 2 or formula 3 in the above-mentioned liquid crystal alignment film, and will not be repeated here. The solvent in step 1) can be N-methylpyrrolidone, γ-butyrolactone or...

Embodiment 1

[0062] 1) the dianhydride precursor A of 15.5g is in catalyst V 2 o 5 Under the action of oxidation to generate dianhydride B.

[0063] 2) Under nitrogen protection, mix and stir the generated dianhydride B and 9 g of diamine C in 200 ml of dry NMP solution for 24 hours to obtain polyimide acid D.

[0064] 3) Coating polyimide acid D evenly on the substrate, first heating at 80-100°C for about 1h, evaporating part of the solvent, cyclizing part of polyimide acid D, and then heating at 210-240°C for about 1h, The polyimide E was produced, and the alignment film 1 of this invention was obtained.

Embodiment 2

[0066] 1) the dianhydride precursor A of 15.5g is in catalyst V 2 o 5 Under the action of oxidation to generate dianhydride B.

[0067] 2) Under the protection of nitrogen, the generated dianhydride B and 9.5 g of diamine C were mixed and stirred in 200 ml of dry NMP solution for 24 hours to obtain polyimide acid D.

[0068] 3) Coating polyimide acid D evenly on the substrate, first heating at 80-100°C for about 1h, evaporating part of the solvent, cyclizing part of polyimide acid D, and then heating at 210-240°C for about 1h, The polyimide E was produced, and the alignment film 2 of this invention was obtained.

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Abstract

The invention provides a liquid crystal orientation film and a preparation method thereof, and a liquid crystal display device comprising the orientation film. The orientation film consists of polyimide; the polyimide is obtained by reaction of a compound represented in the formula 2 or 3 and aromatic diamine represented in the formula 1, wherein the substituent of R1, R2, R3, R4, R5, R6, R7, R1', R2', R3', R4', R5', R6', R7' or R8' is H, alkane group, aromatic hydrocarbon or halohydrocarbon base; and Ar is aryl. The liquid crystal orientation film has a regular three-dimensional structure, so that Pi-Pi mutual attraction action among polyimide main chains is reduced, and liquid crystal molecules are uniformly arranged on the surface of the polyimide; and therefore, the contrast of the liquid crystal display device is improved. FORMULA (2), FORMULA (3), and H2N-Ar-NH2 (1).

Description

technical field [0001] The invention relates to thin film transistor liquid crystal display (TFT-LCD) technology, in particular to a liquid crystal alignment film, a preparation method thereof and a liquid crystal display device comprising the alignment film. Background technique [0002] In the production process of thin film transistor liquid crystal display, the uniformity of liquid crystal orientation directly affects the quality of the display. In production, the process of coating alignment film on the substrate is generally used to realize the alignment of liquid crystal molecules. Such as figure 1 As shown, the alignment film 2 coated on the surface of the substrate 1 is aligned along the rubbing direction under the action of the rubbing roller 3 rotating at high speed. The anchoring effect of the film on the liquid crystal molecules on the surface makes the liquid crystal molecules align in a certain direction. The main component of the alignment film is polyimide...

Claims

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Application Information

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IPC IPC(8): G02F1/1337C09K19/56
CPCC09D179/08G02F1/133723G02F1/133784C09K2323/027C09K2323/02C09K2323/00
Inventor 肖昂朱海波宋省勋李伟刘志勇
Owner BEIJING BOE OPTOELECTRONCIS TECH CO LTD