Patent ID: 8404317

Claim:
A liquid crystal composition that has a negative dielectric anisotropy and contains at least one 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 2 , R 3 and R 4 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; ring A is independently 1,4-cyclohexylene or 1,4-phenylene; Z 1 is independently a single bond, ethylene, methyleneoxy or carbonyloxy; X 1 and X 2 are independently fluorine or chlorine; and m is 1, 2 or 3.