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Liquid crystal aligning agent and in-plane switching mode liquid crystal display

A technology of liquid crystal display element and liquid crystal alignment agent, which is applied in the direction of instruments, optics, nonlinear optics, etc., and can solve problems such as poor printing and poor orientation

Active Publication Date: 2010-01-13
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the use of known liquid crystal aligning agents containing polyamic acid or imide polymer obtained by dehydrating and ring-closing it (refer to Japanese Patent Application Laid-Open No. 9-197411, Japanese Patent Laid-Open No. 2003-149648 and Japanese Patent Application Laid-Open No. Publication No. 2003-107486) When making a transverse electric field liquid crystal display element, poor alignment may sometimes occur due to poor printing

Method used

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  • Liquid crystal aligning agent and in-plane switching mode liquid crystal display

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Embodiment

[0074] Hereinafter, although an Example demonstrates more concretely, this invention is not limited to these Examples.

[0075] In addition, various measurements of Examples and Comparative Examples were performed by the following methods.

[0076] (1) Liquid crystal orientation

[0077] When voltage was applied and released to the liquid crystal display element which used the obtained coating film as a liquid crystal aligning film, it observed whether there was an abnormal area with a polarizing microscope, and it judged as "good" when there was no abnormal area.

[0078] (2) Printability evaluation

[0079] A glass substrate of 127 mm (D) x 127 mm (W) x 1.1 mm (H) in which an ITO film was formed on the entire surface was prepared. After filtering the liquid crystal alignment agent obtained in the above experiment with a microporous filter with a pore size of 0.2 μm, in an environment of 25° C. or 35° C., use a printing machine for coating liquid crystal alignment film (man...

Synthetic example 1

[0081] 196g (0.90 mole) pyromellitic anhydride and 20g (0.10 mole) 1,2,3,4-cyclobutane tetracarboxylic dianhydride as tetracarboxylic dianhydride, 108g (1.0 mole) as diamine compound Phenylenediamine was dissolved in 1,680g of N-methyl-2-pyrrolidone, and reacted for 4 hours at 40°C to obtain 2,000g of a polyamic acid solution with a solid content concentration of 16% by weight (referred to as "polyamic acid (A) -1)"). A small amount of the obtained polyamic acid was fractionated and N-methyl-2-pyrrolidone was added to obtain a solution having a solid content concentration of 10% by weight. When the viscosity was measured, the viscosity was 60 mPa·s.

Synthetic example 2

[0083] 224g (1.0 moles) of 2,3,5-tricarboxycyclopentylacetic dianhydride and 108g (1.0 moles) of p-phenylenediamine were dissolved in 1,300g of N-methyl-2-pyrrolidone and reacted at room temperature for 6 hours . A small amount of the obtained polyamic acid solution was fractionated and NMP was added to obtain a solution having a solid content concentration of 10% by weight. When the viscosity was measured, the viscosity was 76 mPa·s. Then, 2,000 g of N-methyl-2-pyrrolidone was added and diluted to the obtained polyamic-acid solution. 160 g of pyridine and 210 g of acetic anhydride were added to this solution, followed by dehydration and ring closure at 110° C. for 4 hours. After the imidization reaction, replace the solvent in the system with new γ-butyrolactone (this operation removes pyridine and acetic anhydride used in the imidation reaction from the system), and obtains about 2,000 g of solid content An imidized polymer (referred to as "Imidated polymer (B-1)") soluti...

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Abstract

Disclosed is a liquid crystal aligning agent of a polyamic acid or polyimide using, as a solvent, a combination of a first solvent, a second solvent and a third solvent. The combination may be composed of gamma-butylolactone, butyl cellosolve and isobutyl ketone. This liquid crystal aligning agent is excellent in coatability on a substrate, and hardly causes a printing defect on a comb-shaped electrode in an in-plane switching mode liquid crystal display.

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent used for a transverse electric field type liquid crystal display element. More specifically, it is related with the liquid crystal aligning agent excellent in applicability used for a transverse electric field type liquid crystal display element. Background technique [0002] Conventionally, a TN-type liquid crystal display element having a so-called TN-type (twisted nematic) liquid crystal cell is known. The above-mentioned TN-type liquid crystal cell is formed by forming a polyamic acid, polyimide, etc. on the surface of a substrate provided with a transparent conductive film. After the liquid crystal alignment film, arrange the two substrates facing each other, form a nematic liquid crystal layer with positive dielectric anisotropy in the gap, and make a sandwich structure box, so that the long axis of the liquid crystal molecules moves from one of the substrates to the other. A liqui...

Claims

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Application Information

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IPC IPC(8): G02F1/1337
CPCG02F1/134363G02F1/133784C08G73/1032G02F1/133723G02F1/1337
Inventor 泉谦一中田正一西川通则
Owner JSR CORPORATIOON
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