A kind of positive dielectric anisotropy liquid crystal composition

A liquid crystal composition, anisotropic technology, applied in liquid crystal materials, nonlinear optics, optics, etc., can solve the problem of resistivity reduction and achieve the effect of widening the use temperature, small optical anisotropy, and good low temperature stability

Active Publication Date: 2016-08-24
BEIJING CHENGZHI YONGHUA DISPLAY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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;

Method used

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  • A kind of positive dielectric anisotropy liquid crystal composition
  • A kind of positive dielectric anisotropy liquid crystal composition
  • A kind of positive dielectric anisotropy liquid crystal composition

Examples

Experimental program
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Embodiment Construction

[0044] Below in conjunction with embodiment the present invention is described in further detail:

[0045] The parts involved in the following examples are all mass percentages, and the temperature unit is ° C. The specific meanings and test conditions of other symbols are as follows:

[0046] S-N represents the melting point (°C) from the crystalline state of the liquid crystal to the nematic phase;

[0047] c.p. indicates the clearing point of liquid crystal (°C), test method: DSC quantitative method;

[0048] 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, 25±2°C, test instrument: Abbe refractometer;

[0049] △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±0.5°C, 20 micron parallel box, test...

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Abstract

The invention discloses a positive dielectric anisotropy liquid crystal composition. The liquid crystal composition comprises 1-80% by mass of liquid crystal compound shown in a general formula I described in the specification, 1-70% by mass of liquid crystal compound shown in a general formula II described in the specification and 1-50% by mass of liquid crystal compound shown in a general formula III described in the specification. The composition has relatively large positive dielectric anisotropy, relatively small optical anisotropy, high clearing point, good low-temperature stability and low rotary viscosity, and is especially applicable to manufacturing of an IPS (In Plane Switching) mode liquid crystal display and an FFS (Fringe-Field Switching) model liquid crystal display.

Description

technical field [0001] The invention relates to a liquid crystal composition, in particular to a positive dielectric anisotropy liquid crystal composition which can be used for manufacturing IPS mode liquid crystal display or FFS mode liquid crystal display. Background technique [0002] Thin film transistor liquid crystal display (TFT-LCD) is one of the most promising display technologies in the 21st century, and it is widely used in notebook computers, LCD TVs and other fields. TFT-LCD is an active matrix display formed by introducing thin film transistor switches on the basis of twisted nematic liquid crystal display (TN-LCD), which overcomes the shortcomings of passive matrix display such as cross interference, less information, and slow writing speed. , has greatly improved the display quality, so it has been developed rapidly. [0003] The biggest disadvantage of TFT-LCD is the viewing angle problem, including viewing angle anisotropy and small viewing angle range. W...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/44C09K19/46G02F1/1333
Inventor 华瑞茂夏治国韩耀华温刚
Owner BEIJING CHENGZHI YONGHUA DISPLAY TECHNOLOGY CO LTD
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