Patent ID: 8337964

Claim:
A liquid crystal composition that has negative dielectric anisotropy and includes 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 R 1 , R 2 , R 3 and R 4 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons, alkenyloxy having 2 to 11 carbons, or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine; ring A and ring B are each independently 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene, or tetrahydropyran-2,5-diyl; X 1 , X 2 , X 3 and X 4 are independently hydrogen, fluorine or chlorine, and at least three of X 1 , X 2 , X 3 and X 4 are each independently fluorine or chlorine; Z 1 and Z 2 are each independently a single bond, ethylene, methyleneoxy or carbonyloxy; and k and m are each independently 0,1 or 2, and the sum of k and m is 3 or less.