Patent ID: 7976913

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