Liquid crystal medium and application

A liquid crystal medium and dielectric technology, applied in liquid crystal materials, optics, instruments, etc., can solve the problems of narrow viewing angle, small wavelength dependence of birefringence liquid crystal layer, low contrast, etc., to increase mutual solubility, large dielectric Effects of electrical anisotropy, HD highlights

Inactive Publication Date: 2015-01-07
SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[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 vertical alignment (VA) mode is characterized by its wide viewing angle, high contrast and no need for rubbing alignment, etc. Advantages, it has been widely used and has become a common display mode for large-size TV TFT-LCDs. In addition, the contrast displayed in VA mode is less dependent on the birefringence of liquid crystals, the thickness of the liquid crystal layer, and the wavelength of incident light. Therefore, , VA mode has become a very promising liquid crystal display technology

Method used

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  • Liquid crystal medium and application
  • Liquid crystal medium and application
  • Liquid crystal medium and application

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Embodiment Construction

[0083] Below in conjunction with embodiment the present invention is described in further detail:

[0084] 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:

[0085] S-N represents the melting point (°C) from the crystalline state of the liquid crystal to the nematic phase;

[0086] c.p. indicates the clearing point of the liquid crystal (°C), the test instrument: Mettler-Toledo-FP System Microthermal Analyzer;

[0087] γ1 is the rotational viscosity (mPa·s), and the test conditions are: 25°C, INSTEC: ALCT-IR1, 18 micron vertical box;

[0088] K 11 is the torsional elastic constant, K 33 is the stretch elastic constant, and the test conditions are: 25°C, INSTEC: ALCT-IR1, 18 micron vertical box;

[0089] △ε means dielectric anisotropy, △ε=ε ∥- ε ⊥ , where ε ∥ is the dielectric constant parallel to the molecular axis, ε ⊥ is the dielec...

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Abstract

The invention discloses a negative-dielectric anisotropic liquid crystal medium. The liquid crystal medium comprises one or several 1-50wt% of dielectric neutral compounds shown as a general formula I1 or / and a general formula I2, one or several 1-60wt% of dielectric negative compounds shown as a general formula II and one or several 1-80wt% of dielectric negative compounds shown as a general formula III. The optical anisotropy of the liquid crystal medium is in a range of 0.080-0.150. The liquid crystal medium also has relatively lower rotating viscosity, proper negative-dielectric anisotropy and larger K value and can be used for active matrix display elements comprising the liquid crystal medium, such as active matrix displays with ECB (Event Control Block), FFS (Fringe Field Switching) or IPS (Intrusion Prevention System), MVA (Multi-domain Vertical Alignment), PVA (Patterned Vertical Alignment) or HVA effects.

Description

technical field [0001] The present invention relates to the field of liquid crystal materials, and specifically relates to a liquid crystal medium, which is a liquid crystal medium with negative dielectric anisotropy. The present invention also relates to the use of the liquid crystal medium in active matrix display elements, such as using ECB, FFS or Applications in active matrix displays with IPS, MVA, PVA or HVA effects. 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 contras...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/44C09K19/46C09K19/30C09K19/34C09K19/12G02F1/1333
Inventor 高红茹温刚丰景义翟媛媛孙轩非贾鹏忠
Owner SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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