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

A liquid crystal alignment agent and compound technology, applied in optics, instruments, nonlinear optics, etc., can solve the problems of narrow image viewing angle, decreased brightness or contrast, brightness inversion, etc., to achieve low ion density, improvement of afterimage characteristics, long-term good reliability

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

These liquid crystal display elements have the disadvantages that the viewing angle at which an image can be seen properly is narrow, and when viewed from an oblique direction, a decrease in brightness or contrast and brightness inversion in halftone occur.
[0027] However, the problem of "afterimage" caused by large residual charges cannot be adequately solved using these existing technologies

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0293] Hereinafter, although an Example demonstrates this invention, this invention is not limited to these Examples. The compounds used in the examples are as follows.

[0294]

[0295] Compound (1): pyromellitic dianhydride

[0296] Compound (19): 1,2,3,4-cyclobutanetetracarboxylic dianhydride

[0297] Compound (23): 1,2,3,4-butanetetracarboxylic dianhydride

[0298]

[0299] Compound (V-1): 4,4'-Diaminodiphenylmethane

[0300] Compound (V-7): 1,2-bis(4-aminophenyl)ethane

[0301] Compound (VII-2): 1,3-bis(4-(4-aminobenzyl)phenyl)propane

[0302] Compound (XI-6-1): 1,1-bis[4-(4-aminophenoxy)phenyl]-4-[(4-heptylcyclohexyl)ethyl]cyclohexane

[0303] Compound (XI-4-1): 1,1-bis[4-(4-aminophenoxy)phenyl-4-(trans-4-n-pentylcyclohexyl)cyclohexane

[0304] Compound (XI-6-2): 1,1-bis[4-(4-aminophenoxy)phenyl]-4-[(4-ethylcyclohexyl)ethyl]cyclohexane

[0305] Compound (XI-2-1): 1,1-bis[4-(4-aminophenyl)methylphenyl]-4-n-pentylcyclohexane

[0306]

[0307] Compound (Ina-1)...

Synthetic example 1

[0318] [Synthesis Example 1] (Synthesis of Polyamic Acid)

[0319]Add compound (V-1) (2.91g), dehydrated NMP (54g) and GBL (15g) to a 100mL four-neck flask equipped with a thermometer, a stirrer, a raw material addition port, and a nitrogen gas introduction port, and stir and dissolve it under a dry nitrogen stream . Next, compound (19) (1.01 g) and compound (1) (2.08 g) were added, and it was made to react under room temperature environment 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. Then, BC (25 g) was added to the obtained solution to prepare a polyamic acid solution (PA1) with a concentration of 6 wt%. The weight average molecular weight of the obtained polyamic acid was 57,000.

[0320] The weight average molecular weight of polyamic acid is obtained in the following manner: use phosphoric acid-DMF mixed solution (in terms of weight ratio, phosphoric a...

Embodiment 1

[0326] [Example 1] (production of liquid crystal display element)

[0327] The 6 wt% polyamic acid solution (PA1) prepared in Synthesis Example 1 and the 6 wt% polyamic acid solution (PA2) prepared in Synthesis Example 2 were mixed at a weight ratio of 8 / 2. Next, to the obtained mixture, each 10 parts by weight per 100 parts by weight of the polyamic acid, an alkenyl-substituted natick imide compound (Ina-1) and a compound (Ina-1) having a radical polymerization The compound with unsaturated double bond is MHA. Then, a mixed solvent of NMP / BC=1 / 1 (weight ratio) was added for dilution to prepare a liquid crystal alignment agent with a polyamic acid concentration of 4 wt%. The obtained liquid crystal alignment agent was used to fabricate a liquid crystal display element, and the fabrication method was as follows.

[0328] The liquid crystal alignment agent was coated on two glass substrates with ITO electrodes with a spinner to form a film with a film thickness of 70 nm. Afte...

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PUM

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Abstract

The present invention is a liquid crystal alignment agent for liquid crystal display element, in which the ion density of the liquid crystal alignment agent and the long term reliability problem and image retention characteristic problem corresponding to the electrical characteristics accompanied with the change of ion density along with time. The inventive liquid crystal alignment agent containsa constituent of an alkenyl-substituted Nadic imine compound, a compound with free radical polymerism unsaturated double-bond, and polyamic acid or its derivates, wherein, the alkenyl-substituted Nadic imine compound is a compound represented by the formula (Ina), the proportionality of the alkenyl-substituted Nadic imine compound is 0.01-1.00 relative to the weight of the polyamic acid or its derivates, the proportionality of the compound with free radical polymerism unsaturated double-bond is 0.01-1.00 relative to the weight of the polyamic acid or its derivates, and the proportionality of the polyamic acid or its derivates is 0.5wt%-30wt% of the constituent.

Description

technical field [0001] The present invention relates to a liquid crystal alignment agent which combines an alkenyl-substituted nadiimide compound and a compound having a radically polymerizable unsaturated double bond in polyamic acid. Background technique [0002] Liquid crystal display elements are used in various types of display devices such as viewfinders of video cameras and projection displays represented by monitors of notebook computers and desktop personal computers. Liquid crystal display devices are also used as televisions recently. In addition, liquid crystal display elements are also used as optoelectronic related elements such as optical printer heads, optical Fourier transform devices, and light valves. [0003] Liquid crystal display elements usually have: [0004] 1) A pair of substrates facing each other, [0005] 2) electrodes formed on one or both of the opposing surfaces of the pair of substrates, [0006] 3) a liquid crystal alignment film formed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1337C08F283/04
Inventor 近藤史尚大谷内裕子
Owner JNC CORP
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