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Liquid crystal display element, liquid crystal composition and liquid crystal alignment film

A technology for liquid crystal display elements and liquid crystal alignment films, which is applied in the directions of liquid crystal materials, instruments, chemical instruments and methods, can solve the problems of decreased brightness and low transmittance of liquid crystal display elements, and achieves high voltage retention and low flicker rate. , the appropriate effect of optical anisotropy

Active Publication Date: 2020-09-08
JNC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a photo-alignment film using a polyamic acid prepared from a diamine having an azo group as a raw material may have a low light transmittance and may lower the brightness of a liquid crystal display element.

Method used

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  • Liquid crystal display element, liquid crystal composition and liquid crystal alignment film
  • Liquid crystal display element, liquid crystal composition and liquid crystal alignment film
  • Liquid crystal display element, liquid crystal composition and liquid crystal alignment film

Examples

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Embodiment

[0331] The present invention is further described in detail through examples. The present invention is not limited by these examples. The present invention includes a mixture of the composition of composition example M1 and the composition of composition example M2. The present invention also includes a mixture obtained by mixing at least two of the compositions of the composition examples. The present invention includes a polyamic acid prepared from a mixture of two kinds of tetracarboxylic dianhydrides described in Synthesis Example 2 and Synthesis Example 3. The present invention also includes polyamic acid prepared from a mixture of at least two raw materials (diamine, tetracarboxylic dianhydride or derivatives thereof) described in the synthesis examples. These matters are also the same for the examples such as the fabrication of elements. The synthesized compounds were identified by methods such as NMR analysis. The properties of compounds, compositions, and devices ...

Synthetic example 1

[0437] Add 1.7806 g of diamine (DI-5-12, m=5) and 18.5 g of dehydrated NMP to a 50 mL brown four-neck flask equipped with a thermometer, a stirrer, a raw material input inlet, and a nitrogen inlet, and stir under a dry nitrogen stream dissolve. Subsequently, 1.2194 g of tetracarboxylic dianhydride (XI-1-1) and 18.5 g of dehydrated NMP were added, and stirring was continued at room temperature for 24 hours. BC 10.0g was added to the said reaction solution, and the polyamic-acid solution whose polymer solid content concentration was 6 weight% was obtained. The polyamic acid solution was referred to as PAA1. The weight average molecular weight of the polyamic acid contained in PAA1 was 38,000.

[0438] [Synthesis Example 2 to Synthesis Example 16]

[0439] Except changing the kind of tetracarboxylic dianhydride and diamine, polyamic acid solution (PAA2) to polyamic acid solution (PAA16) having a polymer solid content concentration of 6% by weight were prepared according to Syn...

Synthetic example 17

[0444] Add 1.4725 g of diamine (DI-5-12, m=5), 18.5 g of dehydrated NMP, and 0.407 g of pyridine as a base into a 50 mL brown four-necked flask equipped with a thermometer, a stirrer, a raw material input port, and a nitrogen gas introduction port. g, stirred and dissolved under dry nitrogen flow. Next, 1.5275 g of dimethyl 1,3-bis(chlorocarbonyl)-1,3-dimethylcyclobutane-2,4-dicarboxylate and 18.5 g of dehydrated NMP were added, and stirring was continued for 6 hours under water cooling. Pyridine was removed by distillation, NMP10.0g was added to the reaction solution, and the polyamic acid ester solution whose polymer solid content density|concentration was 6 weight% was obtained. Let the said polyamic acid ester solution be PAE1. The weight average molecular weight of the polyamic acid ester contained in PAE1 is 11,000.

[0445] [Synthesis Example 18 to Synthesis Example 27]

[0446] In addition to changing the types of tetracarboxylic acid diester dichloride and diamine,...

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Abstract

The invention provides a liquid crystal display element, a liquid crystal composition and a liquid crystal alignment film with characteristics such as short response time, high voltage retention rate, low threshold voltage, high contrast ratio, long service life and low flicker rate. The liquid crystal display element comprises: an electrode group formed on one or both of a pair of oppositely arranged substrates; a plurality of active elements connected to the electrode group; a liquid crystal alignment film formed on a pair of substrates The respective facing surfaces of the substrates; and a liquid crystal composition sandwiched between a pair of substrates, wherein the liquid crystal alignment film contains a polymer derived from polyamic acid having a photodecomposable group, and the liquid crystal composition contains a polymer selected from At least one compound in the group of compounds represented by formula (1). R 1 is an alkyl group with a carbon number of 1 to 12; ring A is 1,4-cyclohexylene, 1,4-phenylene, etc.; Z 1 is a single key, etc.; X 1 and X 2 is hydrogen or fluorine; Y 1 For fluorine etc.; a is 1,2,3 or 4.

Description

technical field [0001] The invention relates to a liquid crystal display element, a liquid crystal composition with positive dielectric anisotropy used in the element, and a liquid crystal alignment film. In particular, it relates to devices with twisted nematic (TN), optically compensated bend (OCB), in-plane switching (IPS), fringe field switching (FFS), electric field-sensitive optical Reactive alignment (field-induced photo-reactive alignment, FPA) and other modes of liquid crystal display elements. The invention also relates to a liquid crystal display element of polymer stable alignment type. Background technique [0002] In liquid crystal display elements, the classification based on the operation mode of liquid crystal molecules is: phase change (phase change, PC), twisted nematic (twisted nematic, TN), super twisted nematic (super twisted nematic, STN), electrically controlled birefringence (electrically controlled birefringence, ECB), optically compensated bend (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1337C09K19/08C09K19/12C09K19/20C09K19/30C09K19/34C09K19/42G02F1/13
CPCC09K19/08C09K19/12C09K19/20C09K19/30C09K19/34C09K19/42G02F1/13G02F1/1337C09K19/56C09K2019/0466C09K2019/123C09K2019/3077C09K19/3066C09K19/3402C09K2019/3004C09K2019/3009C09K2019/301C09K2019/3016C09K2019/3019C09K2019/3021C09K2019/3025C09K2019/3071C09K2019/3078C09K2019/3083C09K2019/3422C09K19/3003C09K19/3068C09K2019/3006G02F1/133723G02F1/133788G02F1/1362
Inventor 古里好优斋藤将之
Owner JNC CORP
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