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Liquid crystal display element

A liquid crystal and element technology, applied in the field of transmission and scattering liquid crystal display elements, can solve the problems of high power consumption, etc., and achieve the effects of high adhesion, good optical characteristics, and good scattering characteristics

Active Publication Date: 2017-05-10
NISSAN CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since this standard type device needs to constantly apply a voltage to obtain a transmissive state, it consumes a lot of power when it is mostly used in a transparent state, such as window glass, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0250] The following examples are given to illustrate the present invention in further detail, but are not limited thereto. The abbreviations used below are as follows.

[0251] (specific side chain type diamine)

[0252] A1: 1,3-diamino-4-[4-(trans-4-n-heptylcyclohexyl)phenoxymethyl]benzene

[0253] A2: 1,3-diamino-4-{4-[trans-4-(trans-4-n-pentylcyclohexyl)cyclohexyl]phenoxy}benzene

[0254] A3: Diamine represented by the following formula [A3]

[0255] A4: 1,3-diamino-4-octadecyloxybenzene

[0256]

[0257] (other diamines)

[0258]

[0259] (tetracarboxylic acid component)

[0260]

[0261]

[0262] D1: an alkoxysilane monomer represented by the following formula [D1]

[0263] D2: Octadecyltriethoxysilane

[0264] D3: 3-methacryloxypropyltrimethoxysilane

[0265] D4: 3-ureapropyltriethoxysilane

[0266] D5: Tetraethoxysilane

[0267]

[0268]

[0269]

[0270]

[0271]

[0272]

[0273]

[0274]

[0275] NMP: N-methyl-2-pyrrolidone N...

Synthetic example 1

[0290] Mix C2 (3.19g, 12.8mmol), A1 (4.59g, 11.6mmol) and B2 (2.16g, 14.2mmol) in NMP (24.9g), react at 80°C for 5 hours, add C1 (2.50g, 12.8 mmol) and NMP (12.4 g) were reacted at 40°C for 8 hours to obtain a polyamic acid solution having a resin solid content concentration of 25% by mass.

[0291] After adding NMP to the obtained polyamic-acid solution (30.0g) and diluting to 6 mass %, the acetic anhydride (3.85g) and pyridine (2.40g) were added as an imidation catalyst, and it was made to react at 50 degreeC for 2 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 100 degreeC, and obtained the polyimide powder (1). The imidization rate of this polyimide was 56%, Mn (it is also called number average molecular weight) was 19200, and Mw (it was also called weight average molecular weight) was 56900.

Synthetic example 2

[0293] Mix C2 (1.12g, 4.46mmol), A2 (3.91g, 9.04mmol), B2 (1.72g, 11.3mmol) and B3 (0.46g, 2.26mmol) in NEP (21.4g) and react at 80°C for 5 hours Then, C1 (3.50g, 17.9mmol) and NEP (10.7g) were added, it was made to react at 40 degreeC for 6 hours, and the polyamic-acid solution (2) whose resin solid content concentration was 25 mass % was obtained. Mn of this polyamic acid was 20900, and Mw was 63900.

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Abstract

Provided is a liquid crystal display element which shows high transparency when no voltage is applied and good scattering characteristics when a voltage is applied, and in which a liquid crystal layer shows high adhesiveness to a vertical liquid crystal alignment film. The liquid crystal display element which comprises a liquid crystal layer formed by curing a liquid crystal composition, said liquid crystal composition being disposed between a pair of substrates provided with electrodes respectively, by irradiating with UV rays from a UV-ray irradiation device in a state where a part or the whole of the liquid crystal composition shows liquid crystallinity, and in which at least one of the substrates is provided with a liquid crystal alignment film capable of vertically aligning the liquid crystal, said liquid crystal display element being characterized in that: the liquid crystal composition comprises a liquid crystal, a curable resin, a bifunctional monomer and a monomer containing at least one kind of polar group selected from the group consisting of hydroxyl group, carboxy group and phosphate group; and the liquid crystal alignment film is a liquid crystal alignment film obtained from a liquid crystal alignment agent containing a polymer having a specific side chain structure.

Description

technical field [0001] The present invention relates to a transmission-scattering type liquid crystal display element which exhibits a transparent state when no voltage is applied and a scattering state when a voltage is applied. 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, light utilization efficiency becomes low 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 state) and a scattering state of liquid crystals. Liquid crystal display elements of PDLC (Polymer Dispersed Liquid Cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337C08F2/44C08G73/10C08G77/04G02F1/1334
CPCC08F2/44C08G73/10C08G77/04G02F1/1334G02F1/133365G02F1/133723C09K2323/02C09K2323/00G02F1/13347G02F1/133742C08G18/6229C08K5/37G02F1/1337C08G73/1042C08G73/12C08G77/18C09K19/3852C09K19/3861C09K19/56G02F1/133788
Inventor 保坂和義三木徳俊大村浩之桥本淳马场润一吉田翔太
Owner NISSAN CHEM CORP
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