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Liquid crystal display element, liquid crystal alignment film and liquid crystal alignment treatment agent
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A technology of liquid crystal alignment film and liquid crystal alignment, which can be used in instruments, optics, nonlinear optics, etc., and can solve problems such as high power consumption
Active Publication Date: 2019-06-07
NISSAN CHEM CORP
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However, this standard type device 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 cases in a transparent state, such as window glass, etc.
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[0333] The following examples are given to illustrate the present invention in more detail, but they are not limitedly interpreted.
[0334] "Abbreviations of Compounds Used in Synthesis Examples, Examples, and Comparative Examples"
[0335] L1 (liquid crystal): MLC-6608 (manufactured by MERCK CORPORATION)
[0336] R1 (polymerizable compound): a compound represented by the following formula [R1]
[0337] P1 (photoinitiator): a compound represented by the following formula [P1]
[0399] Mix D1 (2.96g, 15.1mmol), A1 (2.91g, 7.65mmol), B1 (0.93g, 6.11mmol) and C2 (0.17g, 1.57mmol) in NEP (21.0g) and react at 40°C for 8 hours , A polyamic acid solution (1) having a resin solid content concentration of 25% by mass was obtained. The number average molecular weight of this polyamic acid was 23,600, and the weight average molecular weight was 71,800.
Synthetic example 2
[0401] Mix D2 (3.83g, 15.3mmol), A2 (6.04g, 15.3mmol) and B1 (2.33g, 15.3mmol) in NMP (26.4g), react at 50°C for 2 hours, add D1 (2.94g, 15.0 mmol) and NMP (23.8 g) were reacted at 40° C. for 6 hours to obtain a polyamic acid solution (2) whose resin solid content concentration was 25% by mass. The number average molecular weight of this polyamic acid was 22,500, and the weight average molecular weight was 67,100.
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Abstract
Provided are: a liquid crystal display element that shows high adhesion between a liquid crystal layer and a vertical liquid crystal alignment film and excellent vertical alignment properties of a liquid crystal and has good optical characteristics such as transparency in the no voltage-applied state and scattering properties in the voltage-applied state; a vertical liquid crystal alignment film to be used in the liquid crystal display element; and a liquid crystal aligning agent therefor. The liquid crystal display element is provided with the liquid crystal alignment film that is obtained using the liquid crystal aligning agent containing component (A) and component (B). Component (A): a polymer containing at least one structure selected from the group consisting of an aliphatic ring, an aromatic ring and a linear alkyl group and having a side chain that is capable of vertically aligning a liquid crystal. Component (B): at least one generator selected from the group consisting of a photo radical generator, a photo acid generator and a photo base generator.
Description
technical field [0001] The present invention relates to a transmissive-scattering type liquid crystal display element that is transparent when no voltage is applied and that is scattered when voltage is applied, a liquid crystal alignment film used in the liquid crystal display element, and a liquid crystal alignment treatment agent for forming the liquid crystal alignment film. Background technique [0002] As a liquid crystal display element using a liquid crystal material, a TN (twisted nematic, Twisted Nematic) mode is actually used. This mode utilizes the optical rotation characteristics of liquid crystals to switch light, and a polarizing plate is required when used as a liquid crystal display element. However, the utilization efficiency of light becomes low due to the use of the polarizing plate. [0003] As a liquid crystal display element with high light utilization efficiency without using a polarizing plate, there is a liquid crystal display element that switches...
Claims
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