Patent ID: 8398886

Claim:
A liquid crystal composition that has negative dielectric anisotropy and comprises two components, wherein a first component is at least one compound selected from the group of compounds represented by formula (1), and a second component is at least one compound selected from the group of compounds represented by formula (2): wherein R 1 , R 2 , R 3 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; the ring A is independently 1,4-cyclohexylene or 1,4-phenylene; the ring B is independently 1,4-cyclohexylene, 1,4-phenylene in which arbitrary hydrogen may be replaced by fluorine or chlorine, or tetrahydropyran-2,5-diyl, and at least one of the ring B is tetrahydropyran-2,5-diyl; Z 1 is independently ethylene or methyleneoxy; Z 2 is independently a single bond, ethylene, methyleneoxy or carbonyloxy; m and n are each independently 1, 2 or 3; and one of X 1 and X 2 is fluorine and the other is chlorine.