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Method for producing substrate having liquid crystal orientation film for in-plane-switching liquid-crystal display element

A liquid crystal and group technology, which is applied in the field of manufacturing liquid crystal display elements with excellent afterimage characteristics, and can solve the problems of inability to achieve liquid crystal alignment, inability to uniformly rub the liquid crystal alignment film, and dust generation.

Active Publication Date: 2016-03-16
NISSAN CHEM IND LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the brushing method of rubbing the surface of a liquid crystal alignment film made of polyimide or the like has problems of generating dust and static electricity.
In addition, due to the high-definition of liquid crystal display elements in recent years, the unevenness caused by the electrodes on the corresponding substrate or the switching active elements for liquid crystal driving, it is impossible to rub the surface of the liquid crystal alignment film uniformly with a cloth, and it is impossible to achieve a uniform liquid crystal. orientation

Method used

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  • Method for producing substrate having liquid crystal orientation film for in-plane-switching liquid-crystal display element
  • Method for producing substrate having liquid crystal orientation film for in-plane-switching liquid-crystal display element
  • Method for producing substrate having liquid crystal orientation film for in-plane-switching liquid-crystal display element

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0291] [Preparation of polymer composition]

[0292] The polymer composition used in the present invention is preferably prepared in the form of a coating liquid so as to be suitable for forming a liquid crystal aligning film. That is, the polymer composition used in the present invention is preferably prepared in the form of a solution in which a resin component for forming a resin coating is dissolved in an organic solvent. Here, the resin component refers to a resin component containing the above-mentioned photosensitive side chain type polymer capable of expressing liquid crystallinity. In this case, the content of the resin component is preferably 1% by mass to 20% by mass, more preferably 3% by mass to 15% by mass, particularly preferably 3% by mass to 10% by mass.

[0293] In the polymer composition of this embodiment, the above-mentioned resin components may all be the above-mentioned photosensitive side-chain polymers capable of exhibiting liquid crystallinity,...

Embodiment

[0423] Abbreviations used in Examples are shown below.

[0424]

[0425]

[0426] MA1 was synthesized by the synthesis method described in the patent document (WO2011-084546).

[0427] MA2 was synthesized by the synthesis method described in the patent document (Japanese Patent Laid-Open No. 9-118717).

[0428]

[0429] CBDA: 1,2,3,4-cyclobutanetetracarboxylic dianhydride

[0430] PMDA: pyromellitic dianhydride

[0431] BODA: Bicyclo[3.3.0]octane-2,4,6,8-tetracarboxylic dianhydride

[0432]

[0433] DDE: 4,4'-Diaminodiphenyl ether

[0434] DDM: 4,4'-Diaminodiphenylmethane

[0435] DA-3MG: 1,3-bis(4-aminophenyloxy)propane

[0436]

[0437] THF: Tetrahydrofuran

[0438] NMP: N-methyl-2-pyrrolidone

[0439] BC: Butyl cellosolve

[0440] CH 2 Cl 2 : Dichloromethane

[0441]

[0442] AIBN: 2,2'-Azobisisobutyronitrile

[0443] [Synthesis example of polyamic acid and polyimide]

Synthetic example 1

[0444]

[0445] After dissolving MA1 (9.97 g, 30.0 mmol) in THF (92.0 g) and degassing with a diaphragm pump, AIBN (0.246 g, 1.5 mmol) was added and degassed again. Then, it was made to react at 50 degreeC for 30 hours, and the polymer solution of the methacrylate was obtained. This polymer solution was added dropwise to diethyl ether (1000 ml), and the resulting precipitate was filtered. This deposit was wash|cleaned with diethyl ether, and it dried under reduced pressure in 40 degreeC oven, and obtained the methacrylate polymer powder.

[0446] NMP54.0g was added to the obtained powder 6.0g, and it stirred at room temperature for 3 hours. A methacrylate polymer solution (M1) having a solid content concentration of 10.0% by weight was obtained. At the moment the stirring was terminated, the polymer was completely dissolved.

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Abstract

Provided is an in-plane-switching liquid-crystal display element having superior burn-in properties and to which an orientation control ability has been imparted at a high efficiency. The present invention achieves same by means of a polymer composition containing (A) a photosensitive side-chain polymer that expresses liquid-crystal properties in a predetermined temperature range, (B) at least one type of polymer selected from the group consisting of a polyimide and a precursor thereof, and (C) an organic solvent. In particular, the present invention achieves same by means of a method that is for producing a substrate having a liquid-crystal orientation film and obtains a liquid-crystal orientation film for an in-plane-switching liquid-crystal display element, to which an orientation control ability has been imparted, by means of having: [I] a step for forming a coating film by applying the polymer composition onto a substrate having a conductive film for in-plane-switching; [II] a step for radiating polarized ultraviolet rays at the coating film obtained in step [I]; and [III] a step for heating the coating film obtained in step [II].

Description

technical field [0001] The present invention relates to a method for manufacturing a substrate having a liquid crystal alignment film for a transverse electric field drive type liquid crystal display element. More specifically, it relates to a new method for producing a liquid crystal display element excellent in image sticking characteristics. Background technique [0002] Liquid crystal display devices are known as display devices that are light in weight, thin in cross-section, and low in power consumption. In recent years, they have been used in large-scale television applications, etc., and have achieved remarkable development. The liquid crystal display element is constituted, for example, by sandwiching a liquid crystal layer between a pair of transparent substrates provided with electrodes. Also, in a liquid crystal display element, an organic film containing an organic material is used as a liquid crystal alignment film to make liquid crystals exhibit a desired ali...

Claims

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Application Information

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IPC IPC(8): C09K19/38C08F20/30C08L79/08C08L101/02G02F1/1337
CPCC08F20/30C08F120/30C08G73/105C08G73/1071C08G73/1078C09D179/08C09K19/10C09K19/2014C09K19/322C09K19/38C09K2019/0448C09K2019/3425G02F1/133788G02F1/134363C08L33/10
Inventor 根木隆之芦泽亮一万代淳彦名木达哉川月喜弘近藤瑞穂
Owner NISSAN CHEM IND LTD
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