Liquid crystal composition and liquid crystal display device thereof

Abstract

The invention provides a liquid crystal composition which comprises 1-20 wt% of compound disclosed as Formula I, 5-35 wt% of compound selected from Formula II-1, Formula II-2, Formula II-3 and combination thereof, 25-50 wt% of compound disclosed as Formula III, 5-25 wt% of compound composed of Formula IV-1, Formula IV-2 and combination thereof, and 5-25 wt% of compound composed of Formula V-1, Formula V-2 and combination thereof. The liquid crystal composition provided by the invention has the advantages of appropriate optical anisotropy, appropriate dielectric anisotropy, high response speed, high low-temperature storage stability, favorable ultraviolet irradiation resistance and favorable heat stability, and is suitable for IPS (in-plane switching), FFS (fringe field switching) and other display modes. The invention also provides a liquid crystal display device comprising the liquid crystal composition.

Description

technical field [0001] The invention relates to a liquid crystal composition, in particular to a liquid crystal composition with suitable optical anisotropy, suitable dielectric anisotropy, fast response speed, good low-temperature storage stability, good resistance to ultraviolet radiation and Thermally stable liquid crystal composition and its application in liquid crystal display devices. Background technique [0002] The liquid crystal display element works by utilizing the optical anisotropy and dielectric anisotropy possessed by the liquid crystal material itself, and has been widely used at present. Utilizing the different characteristics and working modes of liquid crystal materials, the device can be designed into various working modes. Among them, the TN mode (that is, the twisted nematic mode - the liquid crystal mixture has a nematic type twisted about 90 degrees) is commonly used in conventional displays. structure), STN (that is, super twisted nematic mode), S...

AI Technical Summary

Problems solved by technology

However, since liquid crystals are usually used as a mixture of various components, the mutual solubility between the components is particularly important, and according to different application fields, liquid crystals must meet different requirements, such as electrical conductivity, dielectric anisotropy And optical anisotropy, etc., but the obvious disadvantages in the prior art are longer response time, lower resistivity and high operating voltage, etc., such as EP0673986, DE19528106, DE19528107

In addition, poor storage stability at low temperature is also a defect of many existing liquid crystal materials.

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