| 摘要 |
The invention is to provide an AM device containing a liquid crystal composition satisfying at least one of characteristics such as a high maximum temperature of a nematic phase, a low minimum temperature of the nematic phase, a small viscosity, a large optical anisotropy, a large positive dielectric anisotropy, a large specific resistance, a high stability to ultraviolet light and a high stability to and heat, or having a suitable balance regarding at least two of the characteristics, and the AM device having a short response time, a large voltage holding ratio, a large contrast ratio, a long service life and so forth; wherein a liquid crystal display device contains a liquid crystal composition having a positive dielectric anisotropy and containing a specific compound having a large positive dielectric anisotropy as a first component and a specific compound having a small viscosity as a second component. |
| 主权项 |
1. A liquid crystal display device that has an FFS mode as an operating mode of the liquid crystal display device and an active matrix mode as a driving mode thereof, and contains a liquid crystal composition having a positive dielectric anisotropy, wherein the liquid crystal composition contains at least one compound selected from the group of compounds represented by formula (1) as a first component, at least one compound selected from the group of compounds represented by formula (2) as a second component, and at least one compound selected from the group of compounds represented by formula (3-1) and formula (3-2) as a third component, wherein at least one of the third component is a compound selected from a group of compounds represented by formula (3-2), and a ratio of the first component is 10% by weight or more based on the total weight of the liquid crystal composition: wherein R1, R2, R3, R4 and R5 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons, or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine; ring A and ring B are independently 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene or 2,5-difluoro-1,4-phenylene; ring C, ring D and ring E are independently 1,4-cyclohexylene, 1,3-dioxane-2,5-diyl, 1,4-phenylene, 3-fluoro-1,4-phenylene, 3,5-difluoro-1,4-phenylene or 2,5-pyrimidine; Z1 is independently a single bond, ethylene or carbonyloxy; Z2, Z3 and Z4 are independently a single bond, ethylene, carbonyloxy or difluoromethyleneoxy; Z5 is difluoromethyleneoxy; X1, X2, X3 and X4 are independently hydrogen or fluorine; Y1 is fluorine or trifluoromethoxy; Y2 is fluorine, chlorine or trifluoromethoxy; m is 1, 2 or 3; and n is 1 or 2. |
