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Nematic phase liquid crystal composition

A technology of liquid crystal composition and liquid crystal compound, which is applied in the direction of liquid crystal materials, chemical instruments and methods, etc., can solve the problems of slow response speed, low charge retention rate and lower resistivity of TFT-LCD, and achieve low optical anisotropy, Effects of low rotational viscosity and broadened operating temperature

Active Publication Date: 2013-09-18
SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] (4) Larger dielectric anisotropy: The larger the dielectric anisotropy Δε, the smaller the threshold voltage of liquid crystal, but the ions in the liquid crystal material are easier to precipitate and become free ions, resulting in a decrease in resistivity;
However, due to the limitations of the liquid crystal material itself, TFT-LCD still has many defects such as slow response speed, high voltage, and low charge retention rate.

Method used

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  • Nematic phase liquid crystal composition
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Embodiment Construction

[0045] Below in conjunction with embodiment the present invention is described in further detail:

[0046] The parts involved in the following examples are all percentages by weight, and the unit of temperature is ° C. The specific meanings and test conditions of other symbols are as follows:

[0047] c.p. indicates liquid crystal clearing point (℃), DSC quantitative method test;

[0048] S→N represents the transition temperature from smectic phase to nematic phase (°C), tested by DSC quantitative method;

[0049] Δn means optical anisotropy, Δn=n o -n e , where n o is the refractive index of ordinary light, n e is the refractive index of extraordinary light, test conditions: 25±2°C, 589nm, Abbe refractometer test;

[0050] Δε means dielectric anisotropy, Δε=ε ∥ -ε ⊥ , where ε ∥ is the dielectric constant parallel to the molecular axis, ε ⊥ is the dielectric constant perpendicular to the molecular axis, test conditions: 25±0.5°C, 20 micron parallel box, INSTEC: ALCT-IR1...

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Abstract

The invention discloses a nematic phase liquid crystal composition which is composed of two components, wherein the first component comprises at least one compound shown by a structural formula I, and the content is 10-90% by weight; and the second component comprises at least one compound shown by a structural formula II and at least one compound shown by a structural formula III, and the content is 10-90% by weight. The composition disclosed by the invention has a wider positive dielectric anisotropy range, a lower optical anisotropy, a wider clearing point range and a lower rotary viscosity, is particularly suitable for manufacturing an IPS (in-plane switching) or FFS (fringe field switching) liquid crystal display and particularly suitable for manufacturing a vehicular and TV IPS or FFS liquid crystal display, and has a broad market prospect and a high application value.

Description

technical field [0001] The invention relates to a liquid crystal composition, in particular to a nematic liquid crystal composition used in IPS or FFS display modes. Background technique [0002] Thin film transistor liquid crystal display technology (TFT-LCD), has been widely used in notebook computers, LCD TVs and other fields, and is one of the most promising display technologies in the 21st century. TFT-LCD is an active matrix display formed by introducing a thin film transistor switch on the basis of twisted nematic liquid crystal display technology (TN-LCD), which overcomes cross interference, less information, and slow writing speed in passive matrix display. Disadvantages, the display quality is greatly improved, and it has the advantages of large information capacity, fast response speed, high definition, and full-color video display. [0003] The biggest disadvantage of TFT-LCD is the viewing angle problem, including viewing angle anisotropy and small viewing angl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/44C09K19/30C09K19/12
Inventor 崔青华瑞茂毛联波史子谦乔云霞夏治国张军波郑成武
Owner SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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