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Liquid crystal composition with negative dielectric anisotropy and its application

A liquid crystal composition and compound technology, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problems of insufficient negative dielectric constant, lower liquid crystal viscosity, poor reliability, etc., and achieve large optical anisotropy and proper clearing point , the effect of good reliability

Active Publication Date: 2021-05-25
JIANGSU HECHENG DISPLAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, because the negative dielectric constant of CWO, CCWO and CPWO liquid crystal components is not large enough, and because the refractive index of PP, PWP, CPWO and PP is only moderate and not large enough, the response speed of this type of currently disclosed liquid crystal composition has not yet reached needs, or there is a lot of room for improvement
[0013] In order to make up for the lack of response speed, some examples of liquid crystal use have also been disclosed, such as KR10118293B1, JP4712137B2, TW1247793B, CN101864318B, and CN103382392B disclose the use of liquid crystal components of vinyl-terminated neutral bicyclohexane monomers to reduce the viscosity of liquid crystals , and the common deficiency of this kind of components is the sensitivity to ultraviolet light and high temperature, and the reliability is poor, especially when VHR shows obvious disadvantages at the initial stage and after UV high temperature

Method used

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  • Liquid crystal composition with negative dielectric anisotropy and its application
  • Liquid crystal composition with negative dielectric anisotropy and its application
  • Liquid crystal composition with negative dielectric anisotropy and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0158] The liquid crystal composition of Example 1 was formulated according to the compounds and weight percentages listed in Table 5, and it was filled between the two substrates of the liquid crystal display for performance testing. The test data are shown in the following table:

[0159] Table 5 liquid crystal composition formula and test performance thereof

[0160]

[0161] By comparing the performance of the disclosed negative liquid crystals in Comparative Example 1, Comparative Example 2, and Comparative Example 3, it can be seen that the CPWO class or PWP class used in Comparative Example 1, Comparative Example 2, and Comparative Example 3 Or CWO / CCWO-type negative liquid crystal monomers, the dielectric coefficient of such monomers is not large enough, resulting in a significant room for improvement in the response of the liquid crystal composition. The liquid crystal composition of the present invention still has a significantly low viscosity without using CPWO-t...

Embodiment 2

[0171] The liquid crystal composition of Example 2 was prepared according to the compounds and weight percentages listed in Table 8, and it was filled between the two substrates of the liquid crystal display for performance testing. The test data are shown in the following table:

[0172] Table 8 liquid crystal composition formula and test performance thereof

[0173]

[0174] Add the stabilizer of 250PPM in the liquid crystal composition in table 8

Embodiment 3

[0176] The liquid crystal composition of Example 3 was formulated according to the compounds and weight percentages listed in Table 9, which was filled between the two substrates of the liquid crystal display for performance testing. The test data are shown in the following table:

[0177] Table 9 liquid crystal composition formula and test performance thereof

[0178]

[0179] Add the stabilizer of 200PPM in the liquid crystal composition in table 9

[0180] Comparative Example 4 and Comparative Example 5 disclose the use of alkenyl-terminated neutral bicyclohexane monomers, and the liquid crystal composition has a lower γ1. By comparing Example 2, Example 3, Comparative Example 4 and Comparative Example 5, From the VHR data under UV light irradiation, it can be found that the VHR index in Comparative Example 4 and Comparative Example 5 is low, and there is a problem of poor reliability after UV light irradiation. Although the compositions of Example 2 and Example 3 of t...

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Abstract

The present invention provides a liquid crystal composition, comprising: a compound of formula I; one or more compounds selected from the group consisting of compounds of general formula II-1, II-2, II-3 and II-4; a or more compounds of general formula III; one or more compounds selected from the group consisting of compounds of general formula IV-1 and IV-2; and one or more compounds of general formula V. The liquid crystal composition of the present invention has suitably large optical anisotropy and dielectric anisotropy, suitably high clearing point, good low-temperature storage stability, low rotational viscosity and good reliability, and is suitable for liquid crystal display devices middle.

Description

technical field [0001] The invention relates to a liquid crystal composition, in particular to a liquid crystal composition with negative dielectric anisotropy. The present invention also relates to a liquid crystal display device comprising the liquid crystal composition. Background technique [0002] Liquid crystal display devices work by utilizing the optical anisotropy and dielectric anisotropy of the liquid crystal material itself, and have been widely used at present. Utilizing the different characteristics and working modes of liquid crystal materials, the device can be designed into various working modes. Among them, the TN mode (that is, the twisted nematic mode—the liquid crystal compound has a nematic structure twisted about 90 degrees) is commonly used in conventional displays. ), STN mode (i.e. super twisted nematic mode), SBE mode (i.e. super twisted birefringence mode), ECB mode (i.e. electrically controlled birefringence mode), VA mode (i.e. vertical alignme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/30C09K19/12C09K19/44C09K19/46
CPCC09K19/12C09K19/3003C09K19/3066C09K19/3068C09K19/44C09K19/46C09K2019/122C09K2019/3004C09K2019/3009C09K2019/301C09K2019/3016C09K2019/3021C09K2019/3025C09K2019/3071C09K2019/3078
Inventor 丁文全贺笛杨亚非韩文明陈昭远
Owner JIANGSU HECHENG DISPLAY TECH CO LTD
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