LIQUID CRYSTAL COMPOSITION AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

To provide a liquid crystal composition satisfying at least one of characteristics or having a suitable balance regarding at least two of the characteristics such as high maximum temperature of a nematic phase, low minimum temperature thereof, small viscosity, suitable optical anisotropy, large negative dielectric anisotropy, large specific resistance, high stability to ultraviolet light and heat; an AM device having short response time, a large voltage holding ratio, a large contrast ratio, a long service life and so forth. The liquid crystal composition has negative dielectric anisotropy and contains a compound having high maximum temperature as a first component and a specific compound having large negative dielectric anisotropy as a second component, and may contain a specific compound having small viscosity as a third component, and a specific compound having large negative dielectric anisotropy as a fourth component. A liquid crystal display device includes the composition.

主权项

1. A liquid crystal composition which has a negative dielectric anisotropy and contains at least one compound selected from the group of compounds represented by formula (1) as a first component and at least one compound selected from the group of compounds represented by formula (2) as a second component: wherein, R1 and R3 are independently alkyl having 1 to 12 carbons or alkenyl having 2 to 12 carbons; R2 and R4 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons; ring A and ring B are independently: X1 and X2 are independently fluorine or chlorine; Y1 is hydrogen or methyl; Z1 and Z2 are independently a single bond, ethylene, methyleneoxy or carbonyloxy; k is 0 or 1; m and n are independently 0, 1, 2 or 3, and a sum of m and n is 1, 2 or 3; and when n is 1, R4 is alkyl having 1 to 12 carbons or alkenyl having 2 to 12 carbons.