Patent ID: 7618691

Claim:
A liquid crystal composition having a negative dielectric anisotropy comprising two components, wherein the first component is at least one compound selected from the group consisting of compounds represented by formulas (1-1) and (1-2), and the second component is at least one compound selected from the group consisting of compounds represented by formulas (2-1) to (2-3): wherein R 1 and R 2 are each independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons; R 3 and R 4 are each independently alkyl having 1 to 12 carbons or alkenyl having 2 to 12 carbons, provided that in the alkyl and the alkenyl, arbitrary hydrogen may be replaced by fluorine, and arbitrary —CH 2 — may be replaced by —O—; X 1 and X 2 are each independently fluorine or chlorine; ring A, ring B, ring C and ring D are each independently 1,4-cyclohexylene or 1,4-phenylene; ring E and ring G are each independently 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene or 3-fluoro-1,4-phenylene; ring F is 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene or 2,5-difluoro-1,4-phenylene; and Z′ is a single bond or carbonyloxy.