Liquid crystal composition and liquid crystal display device thereof

Abstract

Provided is a liquid crystal composition, comprising: by weight of the total liquid crystal composition, 1-20% of the compound of formula I; 5-35% of the compound selected from a group consisting of formula II-1, formula II-2, formula II-3, and combinations thereof; 25-50% of the compound of formula III; 5-25% of the compound selected from a group consisting of formula IV-1, formula IV-2, and combinations thereof; and 5-25% of the compound selected from a group consisting of formula V-1, formula V-2, and combinations thereof. The liquid crystal composition has appropriate optical anisotropy and dielectric anisotropy, high speed of response, good low-temperature storage stability, ultraviolet irradiation resistance and heat stability, and is suitable for display modes such as IPS and FFS. Also provided is 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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