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Liquid crystal alignment, liquid crystal alignment film and liquid crystal display device

A liquid crystal alignment agent and device technology, applied in the direction of liquid crystal materials, instruments, chemical instruments and methods, etc., can solve the problems of inconvenience, brightness and contrast reduction, narrow viewing angle, etc.

Active Publication Date: 2012-03-28
长沙道安捷新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, these liquid crystal display devices have the following disadvantages: the viewing angle from which images can be observed relatively narrowly, the brightness and contrast decrease when viewed obliquely, and half-tone brightness inversion occurs.
[0009] On the other hand, polyamic acid or derivatives thereof having a divalent organic group containing phenylenediamino groups are known as materials for liquid crystal alignment agents (for example, refer to International Publication No. 2004 / 053583 pamphlet), but In terms of the performance of uniaxial alignment and its further improvement, further research is required
[0010] It can be seen that the above-mentioned existing liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display device obviously still have inconvenience and defects in structure and use, and need to be further improved urgently.
In order to solve the above-mentioned problems, relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and there are no suitable solutions for general liquid crystal alignment agents, liquid crystal alignment films and liquid crystal display devices. The structure can solve the above-mentioned problems, which is obviously a problem that relevant industry players are eager to solve

Method used

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  • Liquid crystal alignment, liquid crystal alignment film and liquid crystal display device
  • Liquid crystal alignment, liquid crystal alignment film and liquid crystal display device
  • Liquid crystal alignment, liquid crystal alignment film and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0382] Preparation of composition A1 (varnish A1) for liquid crystal alignment film

[0383] 2.83 g of NN2DAMe and 53.4 mL of dehydrated NMP were put into a 100 mL four-neck flask equipped with a thermometer, a stirrer, a raw material inlet, and a nitrogen inlet, and stirred and dissolved under a dry nitrogen stream. While keeping the temperature of the reaction system at 5°C, 1.03g of CBDA and 1.14g of PMDA were added and allowed to react for 30 hours, then 27.7mL of BC and 13.3mL of GBL were added to prepare a polymer component with a concentration of 5wt%. Polyamic acid varnish. In the reaction of the raw materials, when the reaction temperature is raised by the heat of reaction, the reaction temperature is controlled to be about 70°C or lower to react.

[0384] Furthermore, in the examples of the present invention, the reaction was carried out while checking the viscosity during the reaction, and the reaction was terminated when the viscosity of the varnish after adding B...

Synthetic example 2～8

[0387] Preparation of various varnishes

[0388] Varnishes A2 to A8 were prepared and obtained in the same manner as in Varnish A1 except that the raw materials in Table 1 were used in the molar ratio of Table 1 below. Table 1 shows the types of raw materials of varnishes A1 to A8, their molar ratios, and the weight average molecular weight of the obtained polyamic acid.

[0389] Table 1

[0390]

[0391]

Embodiment 1

[0393] Fabrication of unit a for measuring pretilt angle, voltage retention and residual DC

[0394] A glass substrate with ITO electrodes was used as the substrate of the unit a for measurement.

[0395] The varnish A1 obtained in Synthesis Example 1 was coated on the glass substrate with the ITO electrode using a spinner. The coating conditions were 1,700 rpm and 15 seconds. After coating the film, precalcine at 80° C. for about 3 minutes, and then perform heat treatment at 230° C. for 20 minutes to form a liquid crystal alignment film with a film thickness of about 70 nm. Using a friction processing device manufactured by Iinuma GAUGE Co., Ltd., the amount of indentation of the rubbing cloth (hair length 1.8mm: rayon) is 0.40mm, the moving speed of the stage is 60mm / sec, and the roller The obtained polyimide film was subjected to a rubbing treatment at a rotational speed of 1,000 rpm to obtain a substrate for liquid crystal holding.

[0396] After ultrasonically cleaning...

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Abstract

The present invention relates to a liquid crystal alignment agent, a liquid crystal alignment film and liquid crystal display. The liquid crystal alignment agent contains reaction product of tetracarboxylic dianhydride and diamine, that is polyamic acid or its derivative. The liquid crystal alignment film is acquired with the liquid crystal alignment agent. The liquid crystal display comprises a pair of substrates, liquid crystal molecule forming liquid crystal layer between the substrates, electrodes applying voltage to the liquid crystal layer, liquid crystal alignment film making the liquid crystal molecule align in certain direction. The invention provides a liquid crystal alignment film with high-maintenance ratio of voltage, low-remnant DC, and larger delay, also provides a liquid crystal display having the liquid crystal alignment film, excellent contrast, wherein image retention may not be generated.

Description

technical field [0001] The invention relates to a liquid crystal alignment agent, a liquid crystal alignment film and a liquid crystal display device, in particular to a liquid crystal alignment film with high voltage retention rate, low residual DC, and greater retardation, and the liquid crystal alignment film with Liquid crystal display device with excellent contrast and no afterimage. Background technique [0002] Liquid crystal display devices are used in the viewfinder (view finder) of video camera represented by the monitor (monitor) of notebook computer (notebook) or desktop computer (desktop computer), projection type (projection) display (display) and so on. Among these liquid crystal display devices, it is also used as a display device for televisions recently. In addition, it is also used as an optoelectronics-related element such as an optical printer head, an optical Fourier transform element, and a light valve. As the previous liquid crystal display device, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1337C08G73/10
CPCC09K19/56G02F1/1337
Inventor 森隆浩藤马大亮
Owner 长沙道安捷新材料有限公司
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