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Liquid crystal aligning agent, liquid crystal aligning film and liquid crystal display unit

A liquid crystal alignment agent and group technology, applied in liquid crystal materials, instruments, optics, etc., can solve the problems of halftone brightness inversion, narrow viewing angle of visual recognition image, reduced brightness or contrast, etc., and achieve the effect of low residual DC

Inactive Publication Date: 2011-08-17
JNC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, these liquid crystal display elements have disadvantages in that the viewing angle at which an image can be recognized appropriately is narrow, and when viewing from an oblique direction, a decrease in brightness or contrast, and brightness inversion of halftone occur.
[0008] These prior technologies, for the liquid crystal alignment agent used for the formation of the current liquid crystal alignment film that needs to be further improved, are used to obtain the electrical characteristics of the obtained liquid crystal alignment film or to obtain the desired electrical characteristics. There is still a need for further research. room

Method used

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  • Liquid crystal aligning agent, liquid crystal aligning film and liquid crystal display unit
  • Liquid crystal aligning agent, liquid crystal aligning film and liquid crystal display unit
  • Liquid crystal aligning agent, liquid crystal aligning film and liquid crystal display unit

Examples

Experimental program
Comparison scheme
Effect test

example

[0209] Examples are used to illustrate the present invention. In addition, the compounds used in the examples are shown below.

[0210]

[0211] Acid anhydride (H-1): pyromellitic dianhydride

[0212] Acid anhydride (S-1): 1,2,3,4-cyclobutanetetracarboxylic dianhydride:

[0213] Acid anhydride (S-48): ethylenediaminetetraacetic acid dianhydride:

[0214]

[0215] Diamine (P-5): 2,5-bis(4-aminophenyl)pyridine

[0216] Diamine (P-8): 2,5-bis(4-aminophenyl)pyrimidine

[0217] Diamine (V-1): 4,4'-Diaminodiphenylmethane

[0218] Diamine (V-7): 4,4'-diaminodiphenylethane

[0219] Diamine (VI-7): 1,4-bis(4-aminophenyl)-1,4-diazepine

[0220] Diamine (XII-2-1)(R 29 = N-heptyl): 1,1-bis(4-(4-aminophenylmethyl)phenyl)-4-n-heptylcyclohexane

[0221] Diamine (XII-4-1)(R 30 =n-pentyl): 1,1-bis(4-(4-aminophenoxy)phenyl)-4-(n-pentylcyclohexyl)cyclohexane

[0222] Diamine (XII-6-1)(R 30 = N-heptyl): 1,1-bis(4-(4-aminophenoxy)phenyl)-4-(2-(n-heptylcyclohexyl)ethyl)cyclohexane

[0223] DAPY: 2,6-Diaminopyridin...

Synthetic example 1

[0231] In a 100 mL four-necked flask equipped with a thermometer, a stirrer, a raw material input port, and a nitrogen gas introduction port, 1.673 g of diamine (P-5) and 30.0 g of dehydrated NMP were added, and the mixture was stirred and dissolved under a stream of dry nitrogen. Next, 0.6984 g of acid anhydride (H-1), 0.6280 g of acid anhydride (S-1), and 70.0 g of dehydrated NMP were added, and reacted for 15 hours in a room temperature environment. When the reaction temperature rises during the reaction, the reaction temperature is suppressed to about 70°C or less and the reaction proceeds. 10.0 g of BC was added to the obtained solution to obtain a polyamic acid solution having a concentration of 6 wt%. Let polyamic acid be PA1. The weight average molecular weight of PA1 is 27,300.

[0232] The weight average molecular weight of the polyamic acid is calculated by diluting the obtained polyamic acid with a phosphoric acid-DMF mixed solution (phosphoric acid / DMF=0.6 / 100, wei...

Synthetic example 2～12

[0234] The tetracarboxylic dianhydride and diamine were changed as shown in Table 1, and other than that, based on Synthesis Example 1, polyamic acid solutions (PA2) to (PA12) were prepared. Table 1 summarizes the results including Synthesis Example 1.

[0235]

[0236]

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Abstract

The invention relates to a liquid crystal aligning agent, a liquid crystal aligning film and a liquid crystal display unit. The liquid crystal aligning film with less residual DC can be obtained through the liquid crystal aligning agent containing following polyamide acids which is obtained from diamines represented by the formula (P) or from reaction between mixture of diamines represented by the formula (P) and other diamines and tetracaboxylic dianhydride. Moreover, the liquid crystal display unit without burn-in can be obtained through the liquid crystal aligning film. Ring P is pyridine-2, 5-diyl, pyridazine-3,6-diyl, pyrimidine-2, 5-diyl or pyrazine-2, 5-diyl, and K equals 0 or 1, wherein when K equals 0, ring P is pyridine-2, 5-diyl, pyrimidine-2, 5-diyl, and the amino bonding position in the ring is 5.

Description

Technical field [0001] The present invention relates to a liquid crystal alignment agent containing polyamic acid or its derivatives, which is obtained by reacting a diamine having an aromatic ring containing 1 or 2 nitrogen atoms with tetracarboxylic dianhydride of. It also relates to a liquid crystal alignment film obtained from the liquid crystal alignment agent, and a liquid crystal display element having the liquid crystal alignment film. Background technique [0002] The liquid crystal display element is a variety of liquid crystal displays such as the viewfinder of the video camera, the viewfinder of the video camera, the projection display, etc., such as the monitor of a notebook computer or a desktop computer. It is used in devices and has recently begun to be widely used as a display element for televisions. In addition, it can also be used as an optical printer head, optical Fourier transform (optical Fourier transform) element, light valve and other optoelectronic r...

Claims

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Application Information

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IPC IPC(8): G02F1/1337C08G73/10C09K19/56
CPCC08G73/1085C08L79/08C09K19/56G02F1/133723
Inventor 片野裕子近藤史尚
Owner JNC CORP
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