Patent ID: 8586152

Claim:
A liquid crystal composition that has a negative dielectric anisotropy and contains at least one optically active 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 4 and R 5 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or 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 differently alkyl having 1 to 12 carbons or alkenyl having 2 to 12 carbons; ring A and ring B are independently 1,4-cyclohexylene or 1,4-phenylene; ring C is independently 1,4-cyclohexylene, 1,4-phenylene in which arbitrary hydrogen may be replaced by fluorine or chlorine, or tetrahydropyran-2,5-diyl; Z 1 is independently a single bond, ethylene, methyleneoxy or carbonyloxy; X 1 and X 2 are independently fluorine or chlorine; Y 1 is hydrogen or —CH 3 ; and k is 1, 2 or 3.