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

A technology of liquid crystal alignment agent and polymer, applied in liquid crystal materials, optics, instruments, etc., can solve the problems of narrow image viewing angle, half-tone brightness inversion, brightness or contrast reduction, etc., and achieve low ion density and high voltage retention Effect

Active Publication Date: 2012-04-25
SHENZHEN DALTON ELECTRONICS MATERIAL CO LTD
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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 disadvantages in that the viewing angle for accurately recognizing an image is narrow, and when viewed from an oblique direction, brightness or contrast decreases, and halftone brightness inversion occurs.
[0011] This shows that above-mentioned existing liquid crystal aligning agent, liquid crystal aligning film and liquid crystal display element obviously still have inconvenience and defect in structure and use, and urgently need to be further improved
In order to solve the above-mentioned problems, the relevant manufacturers have tried their best to find a solution, but for a long time no suitable design has been developed, and the general product has no suitable structure to solve the above-mentioned problems. This is obviously the relevant industry. Urgent problem

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0242] Hereinafter, although an Example demonstrates in detail the liquid crystal aligning agent and liquid crystal display element obtained by using the polymer of this invention, this invention is not limited to these Examples. In the embodiments, GPC is used to measure the molecular weight, polystyrene is used as the reference solution, and dimethylformamide (DimethylFormamide, DMF) is used as the eluent. In addition, in the following examples, the unit liter of volume is represented by L. Thus, mL means milliliters.

[0243] The evaluation methods of the liquid crystal display elements used in the examples are shown below.

[0244] (1) Residual DC

[0245] After superimposing a DC voltage of 3 V on a rectangular wave of 3 V at 30 Hz for 30 minutes, the flicker cancellation voltage after 5 minutes was measured, and the absolute value of this value was defined as residual DC. The smaller the residual DC, the smaller the afterimage, and therefore it was considered good.

...

Synthetic example 1

[0277]

[0278] In a 100mL four-necked flask equipped with a thermometer, a stirrer, a raw material input port, and a nitrogen inlet, put 0.125g of compound (a-1), 2.26g of compound (V-1), and 24mL of dehydrated NMP, and dry Stir to dissolve under nitrogen flow. While keeping the temperature of the reaction system at 5°C, 1.24 g of compound (19) and 1.38 g of compound (1) were added and allowed to react for 30 hours, then 13 mL of BC and 28 mL of GBL were added to prepare a polymer component The concentration is 5wt% polyamic acid solution. In the reaction of the raw material, when the reaction temperature rises due to the heat of reaction, the reaction temperature is controlled to be about 70°C or lower to react.

[0279] In addition, in the examples of the present invention, the reaction was carried out while checking the viscosity during the reaction, and when the viscosity of the varnish after adding BC reached 30 mPa·s to 35 mPa·s (using an E-type viscometer; 25° C.) ...

Synthetic example 2～6

[0282]

[0283] Varnish A2-A6 was prepared by the method similar to synthesis example 1 except having changed tetracarboxylic dianhydride and diamine into the kind and mixing ratio (mol%) shown in Table 1, respectively. The molar ratio of the total amount of tetracarboxylic dianhydride to the total amount of diamine is 1. Table 1 shows the weight average molecular weight of the obtained polyamic acid.

[0284]

[0285]

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Abstract

The invention relates to a liquid crystal orientation agent, a liquid crystal orientation membrane and a liquid crystal displaying unit. The object of the invention is to provide a liquid crystal orientation membrane with high voltage retention rate, low ion density and low residual DC and a liquid crystal orientation agent capable of forming the liquid crystal orientation membrane and a liquid crystal displaying unit which does not easily generate image-retention. The liquid crystal orientation agent comprises the following polymers and solvent, wherein at least one polymer is selected from the polyamic acid formed by reacting mixture of the diamine represented by the above formula (a) and the other diamide with the derivative of the polyamic acid and the other diamide is the mixture of at least one non side-chain type diamine, or at least one of side-chain type diamine, or mixture of at least one of non side-chain type diamine and at least one of side-chain type diamine. And L<1> is alkyl, phenyl or benzyl with hydrogen, carbon number of 1-4.

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent, a liquid crystal aligning film and a liquid crystal display element, in particular to a liquid crystal aligning agent which contains the following polyamic acid or its derivatives, the polyamic acid is obtained by making 3,5-di Amino-1,2,4-triazole (3,5-diamino-1,2,4-triazole) and a specific diamine (diamine) formed by the reaction of a diamine mixture with tetracarboxylic dianhydride (tetracarboxylicdianhydride) acquired. Background technique [0002] Represented by monitors of notebook computers or desktop computers, liquid crystal display elements are used in various liquid crystal displays such as viewfinders of video cameras and projection displays. Among display devices, recently, they are widely used as display elements for televisions. In addition, it is also used as an optoelectronics-related element such as an optical printer head, an optical fourier transform element, and a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1337
CPCC09K19/56G02F1/1337
Inventor 森隆浩瓜生阳一藤原武
Owner SHENZHEN DALTON ELECTRONICS MATERIAL CO LTD
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