Negative dielectric anisotropy liquid crystal material composition and liquid crystal display device using the same

Abstract

The invention relates to a negative dielectric anisotropy liquid crystal material composite and a display element containing the liquid crystal composite. The negative dielectric anisotropy liquid crystal material composite contains at least one composite which is composed of compounds and expressed as general formulas (I) and (II) as a first component, at least one composite which is composed ofchemicals and expressed as a general formula (III) as a second component and at least one composite which is composed of chemicals and expressed as general formulas (IV) and (V) as a third component.The composite has significant negative dielectric anisotropy, a wide-enough nematic temperature range and refraction index anisotropy range, low viscosity and very excellent ultraviolet (UV) irradiation resistance performance and can fully satisfy requirements on the liquid crystal materials for high-grade decorative PDLC and simultaneously, in optical and electrical property, satisfy the requirements on the liquid crystal materials for PDLC display light valves with bistability.

Description

technical field [0001] The present invention relates to a liquid crystal composition for liquid crystal display, and a liquid crystal display element using the composition. More specifically, the present invention relates to a liquid crystal material composition with negative dielectric anisotropy and a liquid crystal display element using the composition. Background technique [0002] Dielectric anisotropy (Δε) is an important physical property of liquid crystal compounds. Due to the special mechanism of liquid crystal molecules, the dielectric constant (ε / / ) in the direction of the long axis of the molecule is different from the dielectric constant (ε⊥) in the direction perpendicular to the long axis of the molecule, so that the liquid crystal displays positive or negative dielectric constants. Anisotropy (Δε=ε / / -ε⊥). Ordinary liquid crystal materials for TN, STN, PDLC, and guest-host display dye liquid crystals all use positive nematic liquid crystal compositions, and t...

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Problems solved by technology

However, it cannot meet the requirements of bistable P

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