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Liquid crystal medium and application

A liquid crystal medium and dielectric technology, used 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. The effect of large absolute value of the opposite sex and high-definition highlights

Active Publication Date: 2015-04-15
SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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  • Abstract
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  • Claims
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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

[0080] Below in conjunction with embodiment, the present invention is described in further detail:

[0081] The parts involved in the following examples are weight percentages, and the temperature unit is ℃, and the specific meanings and test conditions of other symbols are as follows:

[0082] S-N represents the melting point (°C) from the crystalline state to the nematic phase of the liquid crystal;

[0083] c.p. Indicates the clearing point (°C) of the liquid crystal, testing instrument: Mettler-Toledo-FP System micro thermal analyzer;

[0084] γ1 is the rotational viscosity (mPa·s), and the test conditions are: 25°C, INSTEC:ALCT-IR1, 18-micron vertical box;

[0085] K 11 is the torsional elastic constant, K 33 is the splay elastic constant, and the test conditions are: 25℃, INSTEC:ALCT-IR1, 18 micron vertical box;

[0086] △ε represents dielectric anisotropy, △ε=ε ∥ -ε ⊥ , where ε ∥ is the dielectric constant parallel to the molecular axis, ε ⊥ is the dielectric co...

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Abstract

The invention discloses a negative dielectric anisotropic liquid crystal medium which comprises 15 to 55 weight percent of one or more dielectric neutral compounds shown in general formulae I1 and I2, 1 to 60 weight percent of one or more negative dielectric compounds shown in general formula II and 1 to 80 weight percent of one or more negative dielectric compounds shown in general formula III. The optical anisotropy of the liquid crystal medium ranges from 0.080 to 0.150, and the liquid crystal medium has lower rotary viscometer, proper negative dielectric anisotropy and higher K value, and can be used for an active matrix display element with the liquid crystal medium, such as an active matrix display with ECB, FFS or IPS, MVA, PVA or HVA effects (referring to the Specification for the general formulae I1 and I2 as well as the general formula II).

Description

technical field [0001] The present invention relates to the field of liquid crystal materials, in particular to a liquid crystal medium, which is a liquid crystal medium with negative dielectric anisotropy, and also relates to the liquid crystal medium used in active matrix display elements, such as 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 modes, 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] The current liquid crystal display elements are mostly twisted nematic (TN) mode, but it has the disadvantages of low contrast and narrow viewing angle, while vertical a...

Claims

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Application Information

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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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