Patent ID: 7879414

Claim:
A liquid crystal composition having a nematic phase comprising two components, wherein the first component is at least one compound selected from the group of compounds represented by formulas (1-1) to (1-3), and the second component is at least one compound selected from the group of compounds represented by formula (2): wherein R 1 is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons; R 2 and R 3 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; ring A, ring B and ring C are each independently 1,4-cyclohexylene, 1,4-phenylene or 2-fluoro-1,4-phenylene, or 2,5-difluoro-1,4-phenylene; Z 1 and Z 2 are each independently a single bond, ethylene, carbonyloxy or difluoromethyleneoxy, provided that at least one of Z 1 and Z 2 is difluoromethyleneoxy; Z 3 and Z 4 are each independently a single bond, ethylene or carbonyloxy; X 1 , X2, X 3 , X 4 , X 5 , X 6 , X 7 and X 8 are each independently hydrogen or fluorine; Y 1 is fluorine, chlorine or trifluoromethoxy; and m is 0, 1 or 2.