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

A liquid crystal alignment agent and liquid crystal alignment technology, applied in liquid crystal materials, instruments, optics, etc., can solve the problems of decreased brightness or contrast, inversion of brightness, and narrow viewing angle of visual images, and achieve improved black level and good alignment. Effect

Active Publication Date: 2011-08-31
JNC CO LTD +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 following disadvantages: the viewing angle at which images can be viewed correctly is narrow, and when viewed from an oblique direction, a decrease in brightness or contrast and brightness inversion at halftones occur
However, the contrast is worse than VA mode

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

example

[0142] Hereinafter, the present invention will be explained through examples and comparative examples.

[0143] The evaluation method of the liquid crystal display element in the example is as follows.

[0144]

[0145] It is determined using an ellipsometer M-2000U (manufactured by J.A. Woollam Co. Inc.). In the case of this example, the retardation value of the film increases in proportion to the degree of alignment of the polymer main chain. That is, a film with a large retardation value has a large degree of alignment.

[0146]

[0147] Use the method described in "Mizushima, the 14th Liquid Crystal Seminar Preliminary Collection p78 (1988)". The measurement was performed by applying a rectangular wave with a wave height of ±5V to the liquid crystal cell. The measurement is performed at 60°C. This value is an index indicating how much the applied voltage is maintained after the frame period. If the value is 100%, it means that all electric charges are maintained.

[0148]

[0...

Synthetic example 1

[0185] (Preparation of polyamic acid varnish A>

[0186] DDM (2.2611g, 11.405mmol) was dissolved in NMP (22.5g), the anhydride (I-1) (0.9988g, 2.851mmol), PMDA (0.6219g, 2.851mmol), and CBDA (1.1183g, 5.702mmol) ) Add while keeping below room temperature. After stirring for 2 hours, NMP (10.0 g) and BC (12.5 g) were added. The viscosity of this solution was 83 mPa·s. This solution was stirred at 70°C for about 4 hours to obtain varnish A with a viscosity of 34 mPa·s. The weight average molecular weight of the polyamic acid of this varnish was 52,000.

[0187] [Synthesis example 2~Synthesis example 23]

[0188]

[0189] With the raw material compositions shown in Table 1 and Table 2, the polyamic acid varnishes B to W were prepared by the same method as Synthesis Example 1, and physical properties were measured in the same manner as Synthesis Example 1. In addition, the parentheses indicate mole percentage.

[0190]

[0191]

[0192]

[0193]

example 1

[0195]

[0196] 1.0 g of varnish A was weighed into a sample bottle, and a mixed solvent of NMP / BC=1 / 1 (weight ratio) was added to obtain 1.67 g. Next, a polyamic acid solution with a polymer concentration of about 3% by weight was dropped on the transparent glass substrate, and coating was performed by the spinner method (2,000 rpm, 15 seconds). After coating, the substrate was heated at 80°C for 3 minutes to evaporate the solvent, and then heat treated in an oven at 230°C for 20 minutes. The polyimide film with a film thickness of about 70 nm was subjected to rubbing treatment (extrusion: 0.3 mm, table feed speed: 60 m / s, rotation speed: 1000 rpm, rubbing cloth: YA-18-R (ray of rayon)). Then, the glass substrate formed with the alignment film was ultrasonically cleaned in ultrapure water for 5 minutes, and then dried in an oven at 120°C for 30 minutes.

[0197] The surface on which the alignment film is formed is the inner side, and the rubbing direction becomes anti-parallel,...

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Abstract

The invention provides a liquid crystal alignment agent, comprising polyamide acids obtained by the reaction of a mixture containing a butanetetracarboxyl dianhydride expressed in a formula (I) and other butanetetracarboxyl dianhydride and diamines, and at least one polymer of the derivative. The liquid crystal alignment agent is characterized in that the sum of the mixture of butanetetracarboxyl dianhydride is the standard; the proportion of butanetetracarboxyl dianhydride in the formula (I) is 5mol%-95mol%, and the proportion of other butanetetracarboxyl dianhydride is 5mol%-95mol%. Through the utilization of the liquid crystal alignment agent, the liquid crystal alignment film with high liquid crystal alignment and good black level can be obtained. The X in the formula (I) is alkylidene with 2-12 carbon.

Description

Technical field [0001] The invention relates to a liquid crystal alignment agent containing polyamic acid or its derivatives and its use. Background technique [0002] The liquid crystal display element is used in the viewfinder of the video camera represented by the display (monitor) of the notebook computer (note personal computer) or the desktop personal computer (desktop personal computer), the projection type display, etc. Liquid crystal display devices have also recently been used in televisions. Furthermore, the liquid crystal display element is also used as an optoelectronics-related element such as an optical printer head, an optical Fourier transform element, and a light valve. [0003] A liquid crystal display element generally includes: 1) a pair of substrates arranged in opposite directions; 2) electrodes formed on one or both surfaces of the pair of substrates, and 3) formed on the opposite surfaces of the pair of substrates. The liquid crystal alignment film of and...

Claims

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Application Information

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IPC IPC(8): C09K19/56G02F1/1337C08G73/10
CPCC08G73/10C08L79/08C09K19/56G02F1/1337
Inventor 田村典央大木洋一郎
Owner JNC CO LTD
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