Negative liquid crystal compound and negative liquid crystal composition and application

Abstract

The invention belongs to the field of liquid crystal compound materials, and relates to a negative liquid crystal compound and a negative liquid crystal composition and its application. The chemical structural formula of the negative liquid crystal compound is shown in general formula I. A negative liquid crystal compound and a negative liquid crystal composition that realizes rapid response, moderate dielectric anisotropy Δε, moderate optical anisotropy Δn, and high stability to heat and light, and its application.

Description

technical field [0001] The invention belongs to the field of liquid crystal compound materials, and relates to a negative liquid crystal compound, a negative liquid crystal composition and its application, in particular to a negative dielectric anisotropic liquid crystal composition and its application. Background technique [0002] Liquid crystal materials are mainly used as dielectrics in liquid crystal displays because the optical properties of such substances can be changed by an applied voltage. Liquid crystal based electro-optical devices are well known to those skilled in the art. This type of device is mainly used in liquid crystal cells with dynamic scattering, DPA (distorted alignment) liquid crystal cells, guest / host type liquid crystal cells, TN cells with twisted nematic structure, STN (super twisted nematic) liquid crystal cells, SBE ( Super birefringence effect) liquid crystal cell and OMI (optical film related) liquid crystal cell. The most common displays ...

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Problems solved by technology

Because in the vertically aligned liquid crystal composition, the proportion of liquid crystal molecules with negative dielectric anisotropy (40% to 80%) is relatively high relative to the proportion of positive liquid crystal molecules in positive liquid crystals (10% to 60%) , which caused the polar single crystal composition to be too high, which caused the charge retention rate of VA devices to fail to meet the requirements, and the response time was slow, so liquid crystal monomers with high absolute values ​​of dielectric anisotropy are urgently needed of

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