Liquid crystal composition and its liquid crystal display device

Abstract

The invention discloses a liquid crystal composition and a liquid crystal display device thereof. The liquid crystal composition comprises: at least one compound of general formula I, at least one compound of general formula II, and at least one compound of general formula III. The liquid crystal composition provided by the present invention has good low-temperature mutual solubility and high optical anisotropy while maintaining a high clearing point and a large absolute value of dielectric anisotropy. The liquid crystal composition is used in liquid crystal displays When used in the device, it can make the liquid crystal display device show the advantages of good weather resistance and high contrast.

Description

technical field [0001] The invention relates to the field of liquid crystal materials, in particular to a liquid crystal composition and a liquid crystal display device thereof. Background technique [0002] Liquid Crystal Display (LCD) has been developed rapidly due to its small size, light weight, low power consumption and excellent display quality, and is especially widely used in portable electronic information products. As the size of LCD screens for portable computers, office applications, and video applications increases, LCDs can be used for large-screen displays and eventually replace Cathode Ray Tube (CRT) displays. [0003] According to the type of display mode, it is divided into PC (phase change, phase change), TN (twist nematic, twisted nematic), STN (super twisted nematic, super twisted nematic), ECB (electrically controlled birefringence, electrically controlled birefringence), OCB (optically compensated bend, optically compensated bending), IPS (in-plane sw...

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Problems solved by technology

The existing liquid crystal composition can obtain better characteristics, but this type of composition has a low clearing point, high viscosity, insufficient optical anisotropy, low absolute value of dielectric anisotropy, and low voltage retention rate. Forming a liquid crystal display with large optical anisotropy, suitable absolute value of dielectric anisotropy, good stability, and good contrast is not helpful, and directly leads to adverse consequences such as low contrast, slow response speed, and poor display effect of the device. , such as foreign patent documents WO9202597, WO9116398, WO9302153, WO9116399, Chinese patent documents CN1157005A, etc., have the above-mentioned shortcomings to varying degrees

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