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Vertical liquid crystal aligning agent and vertical liquid crystal display

A technology of liquid crystal display elements and liquid crystal alignment agents, which is applied in the direction of liquid crystal materials, chemical instruments and methods, instruments, etc., can solve the problems of poor display of liquid crystal display elements, weak interaction, poor liquid crystal wettability, etc., and achieve excellent electrical properties.

Active Publication Date: 2011-07-27
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, since the liquid crystal is directly dropped on the liquid crystal alignment film, compared with the current vacuum injection method, the liquid crystal alignment film also needs to bear the dropping load, and there are many liquid crystal dropping points, so the liquid crystal dropping part and the liquid crystal Uneven alignment occurs at the fusion site between them, resulting in the problem of poor display of the liquid crystal display element
Generally, in order to vertically align liquid crystals, there must be hydrophobic components on the surface of the film, and the wettability of liquid crystals is very poor due to the weak interaction between hydrophobic components and liquid crystals.
As a result, it is considered that uneven orientation occurs due to a large load applied when the liquid crystal is dropped or expanded.
At present, for this shortcoming, attempts have been made to reduce the load on the liquid crystal alignment film and optimize the manufacturing process, such as reducing the amount of liquid crystal dropping, reducing the liquid crystal dropping pressure, etc., but with the further increase in the size of the substrate, the current manufacturing process prevents Display defects cannot be prevented, so it is necessary to improve the liquid crystal alignment film

Method used

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  • Vertical liquid crystal aligning agent and vertical liquid crystal display
  • Vertical liquid crystal aligning agent and vertical liquid crystal display
  • Vertical liquid crystal aligning agent and vertical liquid crystal display

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0088] Synthesis example 1 (synthesis of polyamic acid)

[0089] 13.1 g (0.06 mol) of 2,3,5,6-benzenetetracarboxylic dianhydride as tetracarboxylic dianhydride and 9.0 g (0.04 mol) of 2,3,5-tricarboxycyclopentylacetic dianhydride, 3.2 g (0.03 mol) of p-phenylenediamine as a diamine compound, 9.6 g (0.03 mol) of 4,4'-diamino-2,2'-bis(trifluoromethyl)biphenyl and the above formula (7 ) 20.9 g (0.04 mol) of the compound represented by was dissolved in 185 g of N-methyl-2-pyrrolidone and reacted at 40° C. for 4 hours. Next, the reaction solution was poured into a large excess of methanol to precipitate the reaction product. Then, it was washed with methanol, and dried at 40° C. under reduced pressure for 15 hours to obtain 32.9 g of a polyamic acid having a logarithmic viscosity of 1.21 dl / g (this was referred to as “polyamic acid (PA-1)”).

Synthetic example 2

[0090] Synthesis example 2 (synthesis of polyamic acid)

[0091] In addition to using 19.2 g (0.06 mol) of 4,4'-diamino-2,2'-bis(trifluoromethyl)biphenyl and 20.9 g (0.04 mol) of the compound represented by the above formula (7) as the diamine compound , in the same manner as in Synthesis Example 1, 59.1 g of a polyamic acid having a logarithmic viscosity of 1.16 dl / g (this is referred to as "polyamic acid (PA-2)") was obtained.

Synthetic example 3

[0092] Synthesis example 3 (synthesis of polyamic acid)

[0093] In addition to using 4.9 g (0.045 mol) of p-phenylenediamine, 4.8 g (0.015 mol) of 4,4'-diamino-2,2'-bis(trifluoromethyl)biphenyl and 20.9 g (0.04 mol) of the above Except that the compound represented by the formula (7) was used as a diamine compound, the same procedure as in Synthesis Example 1 was carried out to obtain 49.9 g of a polyamic acid having a logarithmic viscosity of 1.31 dl / g (this was referred to as "polyamic acid (PA-3)") .

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Abstract

The invention provides a vertical liquid crystal alignment agent capable of reducing uneven liquid crystal alignment due to an ODF manner by increasing a liquid crystal wettability of the vertical liquid crystal alignment agent, and capable of generating a higi voltage holding rate and low rudimental DC. The vertical liquid crystal alignment agent is composed of a polymer which comprises an amic acid repeat unit and an imide repeat unit, and at least one of groups in the polymer root derived from tetracarboxylic acid dianhydride or diamine compounds contains fluorin atoms.

Description

technical field [0001] The present invention relates to a vertical alignment liquid crystal display element capable of reducing uneven dropping of liquid crystals and spots of liquid crystal fusion sites in a liquid crystal dropping method (ODF). More specifically, it relates to a vertical liquid crystal aligning agent capable of producing a vertical liquid crystal aligning film having a small residual voltage and a high voltage retention rate, and a vertical liquid crystal display element having the vertical liquid crystal aligning film. Background technique [0002] At present, as a liquid crystal display element, a TN type liquid crystal display element having a so-called TN type (Twisted Nematic) liquid crystal cell is known. The liquid crystal alignment film such as imine is used as the substrate of the liquid crystal display element, and the two substrates are arranged opposite to each other, and a nematic liquid crystal layer with positive dielectric anisotropy is for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1337
CPCC08G73/10C08L79/08C09K19/38C09K19/56G02F1/1337G02F1/133723
Inventor 福间聪司熊谷勉木村礼子
Owner JSR CORPORATIOON