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Negative dielectric anisotropic liquid crystal composition

A liquid crystal composition, anisotropic technology, applied in the direction of liquid crystal materials, chemical instruments and methods, etc., can solve the problems of LCD power consumption increase, liquid crystal resistivity decrease, etc., and achieve the effect of high-definition bright spots, small threshold voltage, and excellent performance

Active Publication Date: 2014-03-26
SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current liquid crystal mixture with negative dielectric anisotropy cannot fully meet the above requirements. The absolute value of the dielectric anisotropy of the liquid crystal mixture is difficult to be higher than 7, and with the increase of the dielectric anisotropy, the resistance of the liquid crystal The rate will drop significantly, and the power consumption of the LCD will also rise sharply.

Method used

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  • Negative dielectric anisotropic liquid crystal composition
  • Negative dielectric anisotropic liquid crystal composition
  • Negative dielectric anisotropic liquid crystal composition

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Embodiment Construction

[0037] Below in conjunction with embodiment the present invention is described in further detail:

[0038] 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:

[0039] c.p. indicates the clearing point of the liquid crystal (°C), the test instrument: Mettler-Toledo-FP System Microthermal Analyzer;

[0040] gamma 1 Indicates bulk viscosity (mPa·s), test instrument: BROOKFIELD DV-IIVISCOMETER, test condition: 20±0.5°C

[0041] 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: 589nm, 20±2°C;

[0042] △ε means dielectric anisotropy, △ε=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℃, 1KHz, HP4284A, 4.0 micron VA box...

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Abstract

The invention discloses a negative dielectric anisotropic liquid crystal composition, which contains the following components by weight: 1-60% of a component A represented by a formula I, 1-70% of component B represented by a formula II or / and a formula III, and 0-40% of component C represented by a formula IV. The liquid crystal composition has characteristics of wide optical anisotropic range, large absolute value negative dielectric anisotropy, high resistivity and high clearing point, is very suitable for manufacturing an optical element and an LCD of a VA mode, and is especially suitable for a low-voltage-driven vehicle-mounted VA-LCD.

Description

technical field [0001] The invention relates to a liquid crystal composition, in particular to a liquid crystal mixture with negative dielectric anisotropy suitable for VA mode. Background technique [0002] In recent years, liquid crystal display has replaced the traditional cathode ray tube display and has become the mainstream product in the field of information display. It is widely used in various displays such as instruments, computers, and televisions, and its application range is also expanding year by year. Liquid crystal material is a liquid crystal phase material between solid phase and liquid phase, with specific optical anisotropy and dielectric anisotropy. 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] Among them, compared with the ordinary TN mode, the VA mode has t...

Claims

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Application Information

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IPC IPC(8): C09K19/46C09K19/44C09K19/42
Inventor 贵丽红丰景义史子谦乔云霞孟劲松颜希哲华瑞茂李雅敏
Owner SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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