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Liquid crystal medium and liquid crystal display including same

A technology of liquid crystal medium and liquid crystal compound, applied in liquid crystal materials, instruments, chemical instruments and methods, etc., can solve the problems of unstable UV light resistance and high temperature resistance.

Inactive Publication Date: 2016-03-23
SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a liquid crystal medium with an optical anisotropy in the range of 0.080 to 0.150, a suitably high negative dielectric anisotropy, and a faster response time. There are defects such as unstable high temperature resistance and unstable anti-UV light performance in the medium

Method used

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  • Liquid crystal medium and liquid crystal display including same
  • Liquid crystal medium and liquid crystal display including same
  • Liquid crystal medium and liquid crystal display including same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0176] The preparation method of liquid crystal medium comprises the following steps:

[0177] (1) Arrange the monomers used in order;

[0178] (2) Place the stainless steel beaker on the balance, and put the monomer into the stainless steel beaker with a spoon;

[0179] (3) Add monomer liquid crystals by required weight in turn;

[0180] (4) Place the stainless steel beaker with the added material on the magnetic stirring apparatus to heat and melt;

[0181] (5) After most of the mixture in the stainless steel beaker is melted, add a magnetic rotor into the stainless steel beaker, stir the liquid crystal mixture evenly, and obtain the liquid crystal medium after cooling to room temperature.

[0182]The obtained liquid crystal medium is filled between the two substrates of the liquid crystal display for performance testing. The monomer structure, dosage (weight percentage) of the specific compound, and the performance parameter test results of the obtained liquid crystal me...

Embodiment 1

[0184] The liquid crystal medium of this embodiment was prepared according to the composition ratio of the liquid crystal medium in Table 1.

[0185] The component distribution ratio and the performance parameter thereof of the liquid crystal medium of table 1 embodiment 1

[0186]

[0187] Reliability data after adding different amounts / different types of additives in embodiment 1 of table 2

[0188]

[0189] From the above table, it can be concluded that using additives I1-4 and I2-1 alone in negative liquid crystal materials is very obvious for improving the UV resistance of liquid crystal materials, and additives I1-4 are more effective than I2-1 in terms of UV resistance The improvement is the most prominent, and when the combination of I1-4+I3-2 is used, the anti-UV and high-temperature performance of the liquid crystal material is excellent.

Embodiment 2

[0191] The liquid crystal medium of this embodiment was prepared according to the composition ratio of the liquid crystal medium in Table 3.

[0192] The component ratio of the liquid crystal composition of table 3 embodiment 2 and performance parameter thereof

[0193]

[0194] Reliability data after adding different amounts / different kinds of additives in embodiment 2 of table 4

[0195]

[0196]

[0197] From the above table, it can be concluded that using additives I1-4 and I2-1 alone in negative liquid crystal materials is very obvious for improving the UV resistance of liquid crystal materials, and additives I1-4 are more effective than I2-1 in terms of UV resistance The improvement is the most prominent, and when the combination of I1-4+I3-2 is used, the anti-UV and high temperature resistance of the liquid crystal material are excellent, and the addition of I1-4 is at 30ppm, and the addition of I3-2 is at 300ppm Excellent performance for improving reliability...

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Abstract

The invention discloses a liquid crystal medium. The liquid crystal medium is a compound containing the following components, wherein a first component must contains one or more compounds represented in the general formula I1 and further contains one or more contain compounds represented in the general formulae (I2-I5) or not; a second component contains one or more liquid crystal compounds represented in the general formula II, and the dielectric anisotropy of the liquid crystal compounds are negative; a third compound contains one or more liquid crystal compounds, the dielectric anisotropy of the liquid crystal compounds are negative, and the absolute values of the liquid crystal compounds are more than 3. A liquid crystal composition disclosed by the invention has the characteristics of negative dielectricity, low rotary viscosity, high response speed and particularly good ultraviolet stability, is applicable to the manufacturing of the liquid crystal medium with negative dielectric anisotropy for displays addressed through active matrixes and particularly liquid crystal displays based on a VA effect or an ECB effect.

Description

technical field [0001] The present invention relates to compounds for use in liquid-crystalline media and to liquid-crystal displays comprising said liquid-crystalline media, in particular to displays addressed by means of an active matrix, especially to liquid crystals with negative dielectric anisotropy for liquid-crystal displays based on the VA or ECB effect medium. Background technique [0002] At present, TFT-LCD has been widely used in industrial fields and household consumption fields, almost completely replacing the traditional CRT display market. According to different liquid crystal display methods, liquid crystal display elements can be divided into twisted nematic (TN) mode, super twisted nematic (STN) mode, in-plane (IPS) mode, vertical alignment (VA) mode and other modes. [0003] Most of the current liquid crystal display elements are twisted nematic (TN) mode, but it has the disadvantages of low contrast and narrow viewing angle, while the display of vertic...

Claims

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Application Information

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IPC IPC(8): C09K19/44C09K19/52G02F1/1333
Inventor 高红茹温刚翟媛媛贾鹏忠王跃华梁瑞祥
Owner SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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