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

A liquid crystal alignment film, liquid crystal alignment technology, applied in the direction of liquid crystal materials, chemical instruments and methods, instruments, etc., can solve the problems of increased power consumption, etc., and achieve the effect of good scattering characteristics, good optical characteristics, and high adhesion

Active Publication Date: 2017-04-19
NISSAN CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the standard type element needs to constantly apply a voltage in order to obtain a transmissive state, so it consumes a lot of power when it is used in many applications in a transparent state, such as window glass, etc.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0278] Examples are listed below to further describe the present invention in detail, but the present invention is not limited to them. The abbreviations used below are as follows.

[0279] (liquid crystal)

[0280] L1: MLC-6608 (manufactured by MERCK CORPORATION)

[0281] (polymeric compound)

[0282]

[0283] (photopolymerization initiator)

[0284]

[0285] (first side chain type diamine)

[0286] A1: 1,3-diamino-4-[4-(trans-4-n-heptylcyclohexyl)phenoxy]benzene

[0287] A2: 1,3-diamino-4-[4-(trans-4-n-heptylcyclohexyl)phenoxymethyl]benzene

[0288] A3: 1,3-diamino-4-{4-[trans-4-(trans-4-n-pentylcyclohexyl)cyclohexyl]phenoxy}benzene

[0289] A4: Diamine represented by the following formula [A4]

[0290] A5: 1,3-diamino-4-octadecyloxybenzene

[0291]

[0292] (second side chain type diamine)

[0293]

[0294] (other diamines)

[0295] C1: m-phenylenediamine

[0296] C2: 3,5-diaminobenzoic acid

[0297]

[0298] (tetracarboxylic acid)

[0299] D1: 1...

Synthetic example 1

[0329] D2 (5.74g, 23.0mmol), A1 (7.08g, 18.6mmol), B1 (2.46g, 9.30mmol) and C2 (0.47g, 3.10mmol) were mixed in NMP (34.5g) and reacted at 50°C for 8 After one hour, D1 (1.50g, 7.65mmol) and NMP (17.3g) were added, it was made to react at 40 degreeC for 8 hours, and the polyamic-acid solution (1) whose resin solid content concentration was 25 mass % was obtained. The number average molecular weight of this polyamic acid was 21,600, and the weight average molecular weight was 67,800.

Synthetic example 2

[0331] After adding NMP to the polyamic acid solution (1) (30.0g) obtained by the synthesis example 1 and diluting to 6 mass %, acetic anhydride (3.15g) and pyridine (2.40g) were added as an imidation catalyst, The reaction was carried out at 50° C. for 3 hours. This reaction solution was poured into methanol (460 ml), and the obtained precipitate was collected by filtration. This deposit was wash|cleaned with methanol, and it dried under reduced pressure at 60 degreeC, and obtained the polyimide powder (2). The imidization rate of this polyimide was 55%, the number average molecular weight was 17,800, and the weight average molecular weight was 49,100.

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Abstract

Provided is a liquid crystal display element having high liquid crystal vertical alignment performance, excellent transparency when no voltage is applied and excellent scattering characteristics when a voltage is applied, and high adhesion performance between a liquid crystal layer and a vertical liquid crystal alignment film. A liquid crystal display element having a liquid crystal layer obtained by arranging a liquid crystal composition, which contains a polymerizable compound that is caused by UV light to undergo a polymerization reaction, between a pair of substrates provided with an electrode, irradiating UV light in a state in which a part or all of the liquid crystal composition exhibits liquid crystallinity, and causing the liquid crystal to harden, at least one of the substrates being provided with a liquid crystal alignment film for causing the liquid crystal to align vertically, wherein the liquid crystal display element is characterized in that the liquid crystal alignment film is obtained from a liquid crystal alignment treatment agent containing a polymer having a first side chain structure and a second side chain structure.

Description

technical field [0001] The present invention relates to a transmissive-scattering type liquid crystal display element that exhibits a transparent state when no voltage is applied and a scattered state when a voltage is applied, and a liquid crystal alignment treatment agent for forming a liquid crystal alignment film used in the element. Background technique [0002] As a liquid crystal display element using a liquid crystal material, a TN (twisted nematic) mode has been put into practical use. This mode uses the optical rotation characteristics of liquid crystals to switch light, and polarizers are required when used as liquid crystal display elements. However, the utilization efficiency of light decreases due to the use of polarizers. [0003] As a liquid crystal display element that has high light utilization efficiency and does not use a polarizing plate, there is a liquid crystal display element that switches between a transmissive state (also called a transparent stat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337C08K5/06C08L79/08G02F1/1334
CPCC08K5/06C08L79/08G02F1/133788C09K2019/0448C08G73/1007C08G73/1042C09K19/56C09K2323/027C09K2323/02C09K2323/00G02F1/133726C08G73/1003G02F1/1334G02F1/1337G02F1/133302C08G73/12G02F1/133723G02F2202/023
Inventor 大村浩之三木徳俊桥本淳保坂和義
Owner NISSAN CHEM CORP
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