Liquid crystal tropism agent, liquid crystal tropism film and liquid crystal display element

A liquid crystal alignment agent and general formula technology, which can be used in liquid crystal materials, optics, instruments, etc., and can solve the problems of increased ion density, decreased brightness, and narrow image viewing angle.

Inactive Publication Date: 2009-07-01
JNC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these liquid crystal display elements have the following disadvantages: the viewing angle that can correctly recognize the image is narrow, the brightness or contrast decreases when viewed from an oblique direction, and the brightness inversion in halftone (brightness inverse) occurs.
If the ion density is high, the voltage applied to the liquid crystal during the frame time will be reduced, resulting in a decrease in brightness, which prevents normal grayscale display
In addition, even if the initial ion density is low, the ion density (long-term reliability) increases after a high-temperature accelerated test is also a problem

Method used

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  • Liquid crystal tropism agent, liquid crystal tropism film and liquid crystal display element
  • Liquid crystal tropism agent, liquid crystal tropism film and liquid crystal display element
  • Liquid crystal tropism agent, liquid crystal tropism film and liquid crystal display element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0372] Hereinafter, the present invention will be described by way of examples, but the present invention is not limited to these examples. The compounds used in the examples are as follows.

[0373]

[0374] Compound: Pyromellitic Dianhydride: PMDA

[0375] Compound: 1,2,3,4-cyclobutanetetracarboxylic dianhydride (1,2,3,4-cyclobutanetetracarboxylic dianhydride): CBDA

[0376]

[0377] Compound: 4,4'-Diaminodiphenylmethane: DDM

[0378] Compound: 4,4′-Diaminodiphenylethane: DDET

[0379] Compound: 1,1-bis[4-(4-aminophenoxy)phenyl]-4-(trans-4-n-pentylcyclohexyl)cyclohexane: 5HHBA

[0380] Compound: 1,1-bis[4-(4-aminophenoxy)phenyl]-4-[(4-n-heptylcyclohexyl)ethyl]cyclohexane: 7H2HBA

[0381] Compound: 1,1-bis[4-(4-aminophenylmethyl)phenyl]-4-n-heptylcyclohexane: 7HBZ

[0382] Compound: 1,3-bis[4-(4-aminophenylmethyl)phenyl]propane: BABZP3

[0383] Compound: 2,2-bis[4-(4-aminophenoxy)phenyl]propane: BAPP

[0384] Compound: 1-phenylmethyl-2,5-diaminobenzene: 2,5-P1PDA ...

Synthetic example 1

[0403] 2.426 g of DDM and 54.0 g of dehydrated NMP were added to a 100 mL four-necked flask equipped with a thermometer, a stirrer, a raw material inlet, and a nitrogen inlet, and they were stirred and dissolved under a dry nitrogen stream. Then, 1.735 g of PMDA, 0.840 g of CBDA, and 15.0 g of dehydrated GBL were added, and reacted at room temperature for 30 hours. When the reaction temperature rises during the reaction, the reaction is carried out by suppressing the reaction temperature to about 70° C. or lower. 25.0 g of BC was added to the obtained solution to obtain a polyamic acid solution having a concentration of 6% by weight. Let this polyamic-acid solution be PA1.

Synthetic example 2～19

[0405] Except changing tetracarboxylic dianhydride and diamine according to Table 1, polyamic acid solutions PA2-PA19 were prepared according to Synthesis Example 1. Table 1 summarizes the results including Synthesis Example 1.

[0406] [Table 1]

[0407]

[0408]

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Abstract

The present invention relates to a liquid crystal aligning agent, a liquid crystal aligning film and a liquid crystal display component. The liquid crystal display component has the advantages of low ion density, excellent long-term reliability and suitability to be applied for a plurality of driving modes. According to the invention, the liquid crystal aligning agent is formed by the liquid crystal aligning agent which comprises the polyamic acid that is taken as the reaction product of specific diamine and tetracarboxylic dianhydride or the derivative thereof, and the epoxide that has average functional base larger than 1 and has epoxy group. Furthermore a liquid crystal display component with the liquid crystal aligning film is composed.

Description

technical field [0001] The invention relates to a liquid crystal alignment agent containing polyamic acid or its derivatives and an epoxy compound, a liquid crystal alignment film formed by the liquid crystal alignment agent, and a liquid crystal display element equipped with the liquid crystal alignment film. Background technique [0002] Liquid crystal display elements are used in monitors of notebook computers or desktop computers, viewfinders of video cameras, and projection displays. Among such liquid crystal display devices, they have recently begun to be used in televisions. In addition, the liquid crystal display element can also be used as an optoelectronics-related element such as an optical printer head, an optical Fourier transform device, or a light valve. [0003] A liquid crystal display element usually has: 1) a pair of substrates facing each other; 2) electrodes formed on one or both sides of the surfaces facing each other of the pair of substrates; 3) elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337
CPCC09K19/56G02F1/1337
Inventor 矢野仁志久田梨香
Owner JNC CORP
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