Liquid crystal composition comprising dibenzo-difurans and application of liquid crystal composition

Abstract

The invention relates to a liquid crystal composition comprising dibenzo-difurans and application of the liquid crystal composition. The liquid crystal composition is prepared from one or more of compounds represented by various generation formulas I; in the general formula I, R1 and R2 are alkyl or alkoxy of H, F, Cl, CN, and C1 to C12 and alkenyl or alkenyloxy of C2 to C12; Z1 and Z2 are one ofsingle-bond or group-CH2CH2-, carbon triple bond, -CH=CH-, -O-, -CF2-CF2-, -CF2-CH2-, -CH2-CF2-, -CF=CF-, -CH2-, -(CH2)3-, -(CH2)4-, -CH2O-, -OCH2-, -CF2O, and -CH2O-; a loop A1 and a loop A2 are single bond or cyclohexane and the like; and m and n are respectively 0, 1 and 2, and the sum of m and n is less than or equal to 2. The liquid crystal composition has the performances of extremely high polarity, low viscosity, high response and the like and is suitable for a display device in VA, ECB, PALC, FFS or IPS modes. The formula is shown in the description.

Description

technical field [0001] The invention belongs to the field of liquid crystal compound materials, and in particular relates to a liquid crystal composition containing dibenzodifurans and an application thereof. 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 are based on the Schadt-Helfrich effect and have a twisted nematic structure. In addition, ther...

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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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