Negative dielectric anisotrophy liquid crystal mixture

Abstract

The invention relates to a polar compound liquid crystal mixture with the negative dielectric anisotrophy, which is characterized by being composed by one or a plurality of compounds in general formulas I-III, wherein R1, R2, R3, R4, R5 and R6 respectively and independently represent the linear chained alkyl with 1-8 carbon atom(s) or the alkoxy with 1-7 carbon atom(s), and Z1, Z2, Z3 and Z4 respectively and independently represent single linkages, - CH2CH2-, - C=-C-, -COO-, -OCH2-, -CH2O-, -CH=N-and the like, n represents three integers of 0, 1 or 2; and link A represents trans form 1, 4 cyclohexylidene or 1, 4-phenylene. The liquid crystal mixture has larger negative dielectric anisotrophy and higher clearing point.

Description

technical field [0001] The invention relates to a liquid crystal mixture with negative dielectric anisotropy, which is mainly used in VA (vertical alignment) mode and can be used in the field of vehicle display and the like. Background technique [0002] Negative dielectric anisotropy liquid crystal materials can be applied in VA, ECB, MVA, PVA, DS, OCB, GH, FLC, PDLC and other display modes. Compared with the ordinary TN mode, the VA mode has a very good dark state contrast, and the contrast is less dependent on the birefringence of the liquid crystal, the thickness of the liquid crystal layer, and the wavelength of the incident light. The VA mode also has a good performance in wide viewing angles. In addition, the VA mode can also omit the rubbing process, which also increases the yield. For the VA display mode, it is often required that the liquid crystal mixture has a large negative dielectric anisotropy, a high clearing point, a low threshold voltage and a fast respons...

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Problems solved by technology

[0003] However, current liquid crystal mixtures with negative dielectric anisotropy cannot fully meet the above requirements, and there are usually few liquid crystal mixtures whose absolute value of dielectric anisotropy is greater than 7.

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