Liquid crystal composition and liquid crystal display element or liquid crystal display device

Abstract

The invention disclosed a liquid crystal composition, which contains one or a plurality of compounds represented by a formula I-a and / or I-b, one or a plurality of compounds represented by a formula II, and one or a plurality of compounds represented by a formula III, wherein the formulas I-a, I-b, II and III are defined in the specification. A purpose of the present invention is to provide a liquid crystal composition and a liquid crystal display element or a liquid crystal display device containing the liquid crystal composition. According to the present invention, the liquid crystal composition has low viscosity, can achieve fast response, and further has moderate dielectric anisotropy delta[epsilon], moderate optical anisotropy delta[n], high thermal stability and high light stability;and the liquid crystal display element or the liquid crystal display device containing the liquid crystal composition has advantages of wide nematic phase temperature range, suitable birefringence anisotropy, high resistivity, good ultraviolet resistance, high charge retention, low vapor pressure and the like.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to a liquid crystal composition, and a liquid crystal display element or a liquid crystal display containing the liquid crystal composition. Background technique [0002] In the development process of LCD, the liquid crystal used in LCD is developing towards the direction of faster response speed and better reliability, and the high-speed response characteristic of liquid crystal mixture comes from the corresponding physical parameters of its components, such as rotational viscosity gamma1, elastic constant ( K), etc., a high Δn helps to reduce the thickness of the liquid crystal cell, thereby improving the response speed, and at the same time, the monomer with high-definition bright spots is also conducive to the combination and matching of mixed crystals. It can be seen from this that an ideal liquid crystal monomer should have the characteristics of low gamma1, hig...

AI Technical Summary

Problems solved by technology

[0006] However, although liquid crystals that directly connect double bonds to benzene rings have appeared (conjugated olefinic liquid crystals), they have not been used in the formulation of commercial liquid crystals. Reduce the charge retention rate of liquid crystal, especially after UV irradiation and after heating

Images