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

A liquid crystal aligning agent and compound technology, applied in liquid crystal materials, instruments, chemical instruments and methods, etc., can solve the problems of brightness inversion, reduced brightness or contrast, and unresearched electrical characteristics, so as to suppress the reduction of voltage retention. Effect

Active Publication Date: 2010-06-02
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

These liquid crystal display devices have disadvantages such as a narrow viewing angle for correct visual recognition of images, a decrease in brightness or contrast when viewed in an oblique direction, and brightness inversion at halftones.
[0017] However, voltage retention and long-term reliability issues have not been adequately addressed by these prior techniques
For example, in Patent Document 7, the hardening accelerator evaporates, sublimes, and decomposes during the imidization of the liquid crystal alignment film. The effect of additives on the electrical characteristics of liquid crystal alignment films has not been studied

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

[0274] Hereinafter, although an Example demonstrates this invention, this invention is not limited to these Examples. The compounds used in the examples are as follows.

[0275]

[0276] Compound (1): pyromellitic dianhydride

[0277] Compound (19): 1,2,3,4-cyclobutanetetracarboxylic dianhydride

[0278] Compound (23): 1,2,3,4-butanetetracarboxylic dianhydride

[0279]

[0280] Compound (V-1): 4,4'-Diaminodiphenylmethane

[0281] Compound (V-7): 1,2-bis(4-aminophenyl)ethane

[0282] Compound (VII-2): 1,3-bis(4-(4-aminobenzyl)phenyl)propane

[0283] Compound (XI-2-1): 1,1-bis(4-(4-aminobenzyl)phenyl)-4-heptylcyclohexane

[0284] Compound (XI-4-1): 1,1-bis[4-(4-aminophenoxy)phenyl-4-(trans-4-n-pentylcyclohexyl)cyclohexane

[0285]

[0286] Compound (A-1-1):

[0287]

[0288] Compound (A-2-1):

[0289]

[0290] Compound (A-6-1):

[0291]

[0292] Compound (A-6-2):

[0293]

[0294] Compound (A-7-1):

[0295]

[0296] Compound (A-7-2):

[0297] ...

Synthetic example 1

[0303]

[0304] In a 100mL four-neck flask equipped with a thermometer, a stirrer, a feed inlet and a nitrogen inlet, add compound (V-1) (2.919g), dehydrated NMP (54g), and dehydrated GBL (15g), Stir while flowing down to dissolve. Next, compound (19) (1.155 g) and compound (1) (1.927 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 controlling the reaction temperature to about 70° C. or less. To the obtained solution, BC (25 g) was added to obtain a polyamic acid solution (PA1) having a polymer concentration of 6 wt%. The polymer in PA1 had a weight average molecular weight of 58,000.

[0305] The weight average molecular weight of polyamic acid is calculated|required as follows. First, a solution having a polyamic acid concentration of 6 wt % obtained through the synthesis reaction was diluted to obtain a solution having a polyamic acid concent...

Synthetic example 2～5

[0307] As shown in Table 1, polyamic acid solutions (PA2-PA5) were obtained according to the method of Synthesis Example 1 except that tetracarboxylic dianhydride and diamine were changed. Table 1 summarizes the results including Synthesis Example 1.

[0308]

[0309]

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Abstract

At present, techniques of adding an additive into acid polyamide so as to improve performance of a liquid crystal display are provided several sorts; however, the problems of voltage holding ratio andlong-time reliability have not been resolved via these former techniques. The purpose of the invention is to resolve these problems. A liquid crystal alignment agent, which is a composition having atleast one polymer selected from acid polyamide and derivatives thereof and a compound having plural allyls, has the proportion of the compound having plural allyls at 0.01 to 1.0 with respect to theweight proportion. Said formula is an example of compound having plural allyls; wherein Z1 is single bond, -O-, or alkylene.

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent containing polyamic acid and a compound having a plurality of allyl groups, and uses of the liquid crystal aligning agent. Background technique [0002] Liquid crystal display devices are being used in various liquid crystal display devices such as display screens of notebook computers and desktop computers, viewfinders of video cameras, and projection displays. Recently, liquid crystal display devices have also begun to be used on TV. In addition, liquid crystal display devices are also used as optical print heads, optical Fourier transform devices, light valves and other optoelectronic related devices. [0003] A liquid crystal display device generally has: 1) a pair of substrates facing each other, 2) electrodes formed on one or both surfaces of the facing surfaces of the pair of substrates, and 3) electrodes formed on the pair of substrates. The liquid crystal aligning films on the ...

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 近藤史尚藤马大亮
Owner 长沙道安捷新材料有限公司
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