Negative dielectric nematic-phase liquid crystal composition and application thereof

Abstract

The invention relates to a negative dielectric nematic-phase liquid crystal composition. The liquid crystal composition contains at least one compound represented by a general formula I and at least one compound represented by a general formula II; in the general formula I, each of R<1> and R<2> separately represents a C1-C12 straight-chain alkyl group, a straight-chain alkoxy groups or a C2-C12 straight-chain alkenyl group, each of L<1> and L<2> separately represents H or F, and n<1> is equal to 0 or 1; and in the general formula II, each of R<3> and R<4> separately represents a C1-C12 straight-chain alkyl group, a straight-chain alkoxy group or a C2-C12 straight-chain alkenyl group, and each of ring A<1> and ring A<2> separately represents trans-1,4-cyclohexyl or 1,4-phenylene. The liquid crystal composition provided by the invention has low rotational viscosity, good low-temperature intersolubility and fast response time, is suitable for vertical alignment (VA) liquid crystal display devices such as VA / multi-domain vertical alignment (MVA) / patterned vertical alignment (PVA) / polymer stabilized vertical alignment (PSVA) liquid crystal display devices and in-plane switching (IPS) and fringe field switching (FFS) liquid crystal display devices, and is particularly suitable for IPS or FFS mode liquid crystal displays.

Description

technical field [0001] The invention relates to a liquid crystal medium, specifically a nematic phase liquid crystal composition. Specifically, the liquid crystal composition provided by the invention has negative dielectric anisotropy, and belongs to the field of liquid crystal materials and their applications. Background technique [0002] Negative liquid crystal was first proposed in the late 1980s. It is mainly used in VA mode. Its main advantage is high contrast, and its main disadvantages are small viewing angle and slow response time. With the development of display technology, MVA, PVA, PSVA and other technologies have emerged one after another, which solve the problems of response time and viewing angle. In recent years, as touch screens have become the mainstream of the mobile device market, IPS and FFS hard-screen displays have inherent advantages. IPS and FFS displays can use both positive and negative liquid crystals. Bending electric field, the positive liquid...

AI Technical Summary

Problems solved by technology

However, the response time problem of negative liquid crystals is a major problem encountered at present. The response time of FFS displays using negative liquid crystals is 50% or more slower than that of positive liquid crystal FFS displays.

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