Low-refractive-index low-threshold negative dielectric anisotropy liquid crystal composition and application

Abstract

The invention relates to a low-refractive-index low-threshold negative dielectric anisotropy liquid crystal composition. The liquid crystal composition comprises the following components in percentageby weight: one or more liquid crystal compounds as shown in a general formula I and accounting for 1-90% of the total mass of the liquid crystal composition; one or more compounds represented by a general formula II and accounting for 1-60% of the total mass of the liquid crystal composition; one or more liquid crystal compounds represented by a general formula III and accounting for 1-60% of thetotal mass of the liquid crystal composition; one or more liquid crystal compounds represented by a general formula IV and accounting for 1-40% of the total mass of the liquid crystal composition, wherein the structures of the general formula I, the general formula II, the general formula III and the general formula IV are shown in the specification. The liquid crystal composition has the advantages of great dielectric anisotropy absolute value, high clearing point, low refractive index, excellent stability, UV resistance and pollution resistance. The liquid crystal composition can be widelyapplied to black-white and TFT-VA mode liquid crystal display elements.

Description

technical field [0001] The invention relates to a low-refractive-index low-threshold negative dielectric anisotropy liquid crystal composition and its application. Background technique [0002] Liquid crystals were discovered a century ago, but their application research has developed rapidly in recent decades. The anisotropy of liquid crystal molecular structure determines the anisotropy of liquid crystal properties. Liquid crystal displays usually utilize the properties of optical anisotropy and dielectric anisotropy of liquid crystal materials to realize display functions. According to the positive and negative of dielectric anisotropy, liquid crystals can be divided into positive dielectric anisotropy liquid crystals and negative dielectric anisotropy liquid crystals. Liquid crystals with negative dielectric anisotropy have better contrast and are widely used, and have become one of the current research hotspots. However, in addition to the negative dielectric anisotr...

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Problems solved by technology

Liquid crystal materials used in VA-type display methods require low-voltage drive, low power consumption, strong UV resistance, wide operating temperature range, and good low-temperature stability. The method of cell thickness and the method of matching liquid crystal with a small refractive index to meet the display requirements, but currently there is no material that can be used as a single compound to meet such performance, such as application number 2014100418173 discloses a low refractive index VA-LCD Using liquid crystal composition, although the refractive index of this composition is relatively low, which meets the needs of customers for larger cell thickness production, but it cannot meet the larger dielectric anisotropy, and is not suitable for low driving voltage liquid crystal displays

For example, application number 201811168306 discloses a liquid crystal composition for VA-LCD with low threshold, low power consumption, low viscosity and fast response. Although this composition meets the requirements of low power consumption and low viscosity, the negative dielectric constant is not large enough and its The working range is relatively narrow and cannot meet the performance requirements of wide temperature -30-80 degrees

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