Patent ID: 8158219

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 and R 2 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; 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, or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine; the ring A is independently and at least one of the rings A is 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 fluorine; Z 1 is independently a single bond, ethylene, methyleneoxy or carbonyloxy; and k is 1, 2 or 3.