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Liquid crystal aligning agent, liquid crystal alignment layer manufacturing method and liquid crystal display device

A technology of liquid crystal alignment agent and polyamic acid, which is applied in liquid crystal materials, chemical instruments and methods, optics, etc., can solve problems such as burn-in, poor display, and lower product yield, and achieve excellent coating or printing properties , Excellent long-term reliability, and improved burn-in characteristics

Active Publication Date: 2015-01-28
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the liquid crystal alignment film is formed by polishing, there is a problem that dust or static electricity is easily generated in the polishing process, so dust will adhere to the surface of the alignment film, which will cause poor display. In the case of the substrate of TFT (Thin Film Transistor) elements, due to the static electricity generated, there is also a problem that the circuit of the TFT element is destroyed, resulting in a decrease in product yield.
In addition, in a liquid crystal display element having a liquid crystal alignment film according to the photo-alignment method, there are problems of image sticking and screen burn-in, and improvement thereof is desired.
In particular, the brightness difference on the screen caused by the above-mentioned pre-tilt angle will be considered by the observer as screen burn-in, and it is urgent to improve it.

Method used

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  • Liquid crystal aligning agent, liquid crystal alignment layer manufacturing method and liquid crystal display device
  • Liquid crystal aligning agent, liquid crystal alignment layer manufacturing method and liquid crystal display device
  • Liquid crystal aligning agent, liquid crystal alignment layer manufacturing method and liquid crystal display device

Examples

Experimental program
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Effect test

preparation example Construction

[0274] The preferred solvent used in the preparation of the liquid crystal aligning agent of the present invention contains one of the above-mentioned organic solvents, or a combination of two or more of the above-mentioned organic solvents. In the following preferred solid content concentrations, the liquid crystal aligning agent contains Each component does not precipitate, and the surface tension of a liquid crystal aligning agent exists in the range of 25-45mN / m.

[0275]The solid content concentration of the liquid crystal aligning agent of the present invention, that is, the ratio of the weight of all components other than the solvent in the liquid crystal aligning agent to the total weight of the liquid crystal aligning agent can be selected in consideration of viscosity, volatility, etc., and is preferably in the range of 1 to 10% by weight Inside. The liquid crystal aligning agent of the present invention forms a coating film as a liquid crystal aligning film by coati...

Embodiment

[0301] Hereinafter, the present invention will be described more specifically by way of examples, but the present invention is not limited thereto.

[0302] The weight-average molecular weight Mw in the following examples is a polystyrene-equivalent value measured by gel permeation chromatography (GPC) under the following conditions.

[0303] Column: manufactured by Tosoh Corporation, TSKgelGRCXLII

[0304] Solvent: THF

[0305] Temperature: 40°C

[0306] Pressure: 68kgf / cm 2

[0307] The epoxy equivalent is measured according to the "hydrochloric acid-methyl ethyl ketone method" of JIS C2105.

[0308] The solution viscosity of the polymer is measured at 25°C using an E-type viscometer for a polymer solution (solvent: N-methyl-2-pyrrolidone) with a polymer concentration of 20% by weight indicated in each synthesis example. value.

[0309] The imidization rate of polyimide is to add the polyimide solution obtained by each synthesis example into pure water, and the resulti...

Synthetic example E-1

[0316] Add 100.0 g of 2-(3,4-epoxycyclohexyl) ethyltrimethoxysilane, 500 g of methyl isobutyl ketone and 10.0 g triethylamine, mix at room temperature. Then, 100 g of deionized water was dropped from the dropping funnel over 30 minutes, followed by mixing under reflux and reacting at 80° C. for 6 hours. After the reaction, the organic layer was taken out and washed with 0.2% by weight of ammonium nitrate aqueous solution until the water after washing was neutral, then the solvent and water were distilled off under reduced pressure to obtain a viscous transparent liquid Polyorganosiloxane (EPS-1) with epoxy groups.

[0317] The polyorganosiloxane (EPS-1) was carried out 1 In H-NMR analysis, a peak derived from epoxy groups with theoretical intensity was obtained around chemical shift (δ) = 3.2 ppm, and it was confirmed that no side reaction of epoxy groups occurred during the reaction.

[0318]The polyorganosiloxane (EPS-1) had a weight average molecular weight Mw of 2,200 a...

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Abstract

The invention relates to a liquid crystal aligning agent, a liquid crystal alignment layer manufacturing method and a liquid crystal display device. The liquid crystal aligning agent which has excellent coating and printing performance on a fine bumpy panel, provides excellent liquid crystal aligning property (pre-tilt angle exhibiting property) through optical aligning method with little radiation exposure, and excellent screen-burning-proof property. The liquid crystal aligning agent contains polysiloxane and polymer having a specific photosensitive structure, wherein the polymer is selected form a group consisting polyamide acids and polymides obtained by dewatering cyclization of the polyamide acids, and the polyamide acids are obtained through reaction between diamine and tetracaboxylic dianhydride. The diamines have alkane with 4-20 carbon atoms, alkoxy with 4-20 carbon atoms, a group connecting more than two 6-membered ring structures, or a group having sterol structures, and have carboxyl.

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent, a method for producing a liquid crystal aligning film, and a liquid crystal display element. Background technique [0002] In a liquid crystal display element, in order to align liquid crystal molecules in a predetermined direction with respect to a substrate surface, a liquid crystal aligning film is provided on the substrate surface. The liquid crystal aligning film is usually formed by rubbing in one direction (rubbing method) on the surface of the organic film formed on the surface of the substrate with a cloth such as rayon. The same applies to the liquid crystal display element of the transverse electric field system. However, if the liquid crystal alignment film is formed by polishing, there is a problem that dust or static electricity is easily generated in the polishing process, so dust will adhere to the surface of the alignment film, which will cause poor display. In the cas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/56G02F1/1337
CPCC08G69/36C08G79/08C08L83/06C09K19/56G02F1/1337
Inventor 宫本佳和大场佑树熊谷勉秋池利之
Owner JSR CORPORATIOON
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