Patent ID: 8124197

Claim:
A liquid crystal composition having a negative dielectric anisotropy that 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 and R 4 are each 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; R 3 is independently alkenyl having 2 to 12 carbons; Z 1 is independently ethylene, methyleneoxy or carbonyloxy; X 1 and X 4 are each independently fluorine or chlorine; one of X 2 and X 3 is hydrogen and the other is fluorine or chlorine; m 1 or 2.