Liquid crystal composition and liquid crystal display device thereof

Abstract

The invention discloses a liquid crystal composition and a liquid crystal display device thereof. The liquid crystal composition comprises one or more compounds in a general formula I-1 and / or I-2 with weight accounting for 1-30% of total weight of the liquid crystal composition; one or more compounds in a general formula II with weight accounting for 1-30% of total weight of the liquid crystal composition; one or more compounds in a general formula III with weight accounting for 15-55% of total weight of the liquid crystal composition; and one or more compounds in a general formula IV with weight accounting for 1-55% of total weight of the liquid crystal composition. The liquid crystal composition has the characteristics of wide nematic phase temperature scope, high clearing point, low rotation viscosity, appropriate high optical anisotropy, appropriate large dielectric anisotropy, good low-temperature stability, and charge conservation rate, and is suitable for the liquid crystal display device.

Description

Technical field [0001] The present invention relates to a liquid crystal composition and a liquid crystal display device thereof, in particular to a liquid crystal composition with suitable optical anisotropy, suitable dielectric anisotropy, higher clearing point, lower rotational viscosity, and a liquid crystal composition containing the liquid crystal composition Object of liquid crystal display device. Background technique [0002] For liquid crystal display elements, according to the display mode of the liquid crystal, it is divided into PC (phase change, phase change), TN (twistnematic, twisted nematic), STN (supertwisted nematic, super twisted nematic), ECB (electrically controlled birefringence) , OCB (optically compensated bending), IPS (in-plane switching), VA (vertical alignment, vertical alignment) and other types. According to the driving mode of the component, it is divided into PM (passive matrix, passive matrix) type and AM (active matrix, active matrix) type. PM...

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Problems solved by technology

[0009] In the existing liquid crystal composition, better characteristics can be obtained, but the temperature range of the nematic phase of this type of compound is not wide enough, the clearing point is low, the rotational viscosity is high, the optical anisotropy is not large enough, and the dielectric anisotropy is not enough Large, poor low-temperature stability, low voltage retention rate, it is not helpful to mix into a composition with large optical anisotropy, suitable dielectric anisotropy, good stability and good contrast, which directly leads to the liquid crystal containing it Bad consequences such as low contrast of display components and slow response speed

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