| 摘要 |
A liquid crystal composition satisfying at least one of characteristics such as a high maximum temperature of nematic phase, a low minimum temperature of nematic phase, small viscosity, suitable optical anisotropy, large dielectric anisotropy, large specific resistance, and high stability to UV light and heat, or having a suitable balance regarding at least two thereof, and an AM device including the composition and having a short response time, a large voltage holding ratio, a large contrast ratio or a long service life are shown. The composition has the nematic phase and contains a specific compound having large dielectric anisotropy as a first component, a specific compound having small viscosity as a second component, and may contain a specific compound having a high maximum temperature or small viscosity as a third component and a specific compound having large dielectric anisotropy as a fourth component. The LCD device includes the composition. |
| 主权项 |
1. A liquid crystal composition that has a nematic phase 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, in formula (1) and formula (2), R1 and R2 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons; R3 is alkenyl having 2 to 12 carbons, or alkenyl having 2 to 12 carbons in which at least one of hydrogen is replaced by fluorine; ring A, ring B and ring C are independently 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 2,3-difluoro-1,4-phenylene, 2,6-difluoro-1,4-phenylene, pyrimidine-2,5-diyl, 1,3-dioxane-2,5-diyl or tetrahydropyran-2,5-diyl; Z1, Z2 and Z3 are independently a single bond, ethylene, vinylene, methyleneoxy, carbonyloxy or difluoromethyleneoxy; L1 and L2 are independently fluorine or chlorine; X1 and X2 are independently hydrogen or fluorine; Y1 is fluorine, chlorine, alkyl having 1 to 12 carbons in which at least one of hydrogen is replaced by halogen, or alkoxy having 1 to 12 carbons in which at least one of hydrogen is replaced by halogen; m and k are independently 0, 1 or 2; and j is 1, 2 or 3, and a sum of m, j and k is 3 or less. |
