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Liquid-crystal display element and display device

A liquid crystal display element, liquid crystal technology, applied in liquid crystal materials, optics, instruments, etc., can solve problems such as insufficient voltage retention

Inactive Publication Date: 2019-04-02
JNC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, regarding the compound, although the ability to vertically align liquid crystal molecules is high, the voltage holding ratio when used in a liquid crystal display element is not large enough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Synthetic example

[0708] Examples of methods for synthesizing compound (1ε) are as follows. Among these compounds, R 1 , MES, M 1 and M 2 The definition of is the same as described in item 81.

[0709] R 2 is the group represented by formula (1εa), Sp 4 for -CH 2 -, X 1 Compound (1ε-51) and compound (1ε-52) which are -OH can be synthesized by the following method.

[0710] Compound (52) was obtained by reacting compound (51) in the presence of formaldehyde and 1,4-diazabicyclo[2.2.2]octane (1,4-diazabicyclo[2.2.2]octane, DABCO). Compound (53) is obtained by reacting compound (52) in the presence of pyridinium p-toluenesulfonate (PPTS) and 3,4-dihydro-2H-pyran.

[0711] Can make compound (54) in Et 3 Compound (1ε-51) was obtained by reacting in the presence of N(triethylamine) and methacryloyl chloride. Compound (1ε-51) is reacted with compound (53) in the presence of DCC and DMAP to obtain compound (55), and deprotection is performed with PPTS (tetrabutylammonium floride). Compound (...

Embodiment 1

[1173] [3. Embodiment 1, Comparative Example 1]

[1174] The vertical orientation and voltage retention (VHR) of compound (1α-4-22) and comparative compound (S-1) were compared. In addition, composition (i) and polymeric compound (M-1-1) were used at the time of evaluation.

[1175] The ratio of the component of composition (i) is shown by weight%.

[1176]

[1177] The polymeric compound (M-1-1) is shown below.

[1178]

[1179] ·Vertical orientation

[1180] The polymerizable compound (M-1-1) was added to the composition (i) at a rate of 0.4% by weight. Compound (1α-4-22) or comparative compound (S-1) was added thereto in a proportion of 3.5% by weight. These mixtures were injected into an element having no alignment film in which the distance (cell gap) between two glass substrates was 3.5 μm, as Example 1 and Comparative Example 1. The element was placed on a polarizing microscope, and light was irradiated onto the element from below to observe the presence or a...

Embodiment 2

[1187] [4. Embodiment 2, Embodiment 3, Comparative Example 2]

[1188] The voltage retention ratio (VHR) of the compound (1α-4-2) was compared with that of the comparative compound (S-1). In addition, composition (ii) and polymeric compound (M-1-3) were used at the time of evaluation.

[1189] The compounds in the compositions are represented by symbols based on the definitions in Table 3 below. In Table 3, the configuration related to 1,4-cyclohexylene is trans configuration. The numbers placed in parentheses after the symbols correspond to the numbers of the compounds. The symbol (-) means another liquid crystal compound. The ratio (percentage) of the liquid crystal compound is the percentage by weight (% by weight) based on the weight of the liquid crystal composition. Finally, the characteristic values ​​of the liquid crystal composition are summarized. The characteristics are measured according to the methods described above, and the measured values ​​are directly de...

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Abstract

The present invention provides a liquid-crystal display element having properties such as a wide temperature range where the element is usable, a short response time, a high voltage holding ratio, a low threshold voltage, a high contrast ratio, and a long life. The liquid-crystal display element of the present invention comprises a first substrate, a plurality of pixel electrodes formed on the first substrate, a second substrate, counter electrodes formed on the second substrate and facing the pixel electrodes, a liquid-crystal layer present between the pixel electrodes and the counter electrodes and comprising a liquid-crystal composition, and alignment control layers constituted of a polymer comprising an aligning monomer, which was a component of the liquid-crystal composition, and formed respectively on the first-substrate side and the second substrate side. The aligning monomer is a polymerizable polar compound comprising both a mesogen moiety constituted of at least one ring anda polar group. Due to this, the alignment control layers in the liquid-crystal display element of the present invention can perpendicularly align the liquid-crystal compound contained in the liquid-crystal composition, without the necessity of forming an alignment film.

Description

technical field [0001] The invention relates to a liquid crystal display element. More specifically, it is related with the liquid crystal display element containing the liquid crystal composition which contains a polymeric polar compound, and dielectric anisotropy is positive or negative. 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), electronically controlled birefringence ( Electrically controlled birefringence (ECB), optically compensated bend (OCB), in-plane switching (IPS), vertical alignment (vertical alignment, VA), fringe field switching (FFS), electric field sensing Field-induced photo-reactive alignment (FPA) and other modes. The component-based driving methods are classified into passive matrix (PM) and active matrix (AM). PM is classified int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/54C09K19/12C09K19/14C09K19/18C09K19/20C09K19/30C09K19/32C09K19/34G02F1/1337
CPCG02F1/133711C09K2019/0425C09K2019/0448C09K2019/3009C09K2019/3027C09K2019/122C09K2019/3036C09K2019/301C09K2019/3016C09K19/3068C09K2019/3422C09K2019/3021C09K2019/123C09K2323/00C09K2323/02G02F1/133742C09K19/3001C09K19/3003C09K19/3066C09K19/56C09K2019/3004G02F1/134309
Inventor 片野裕子近藤史尚荻田和寛远藤浩史
Owner JNC CORP
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