Patent ID: 8491814

Claim:
The invention concerns a liquid crystal composition having a negative dielectric anisotropy that includes two components, wherein the first component is at least one compound selected from the group of compounds represented by formulas (1), the second component is at least one compound selected from the group of compounds represented by formulas (2): wherein R 1 , R 2 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 3 is alkyl having 1 to 12 carbons or alkenyl having 2 to 12 carbons; R 4 is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, or alkenyl having 2 to 12 carbons; one of X 1 and X 2 is oxygen and the other is fluorine; ring A is independently 1,4-cyclohexylene or 1,4-phenylene, arbitrary one —CH 2 — in 1,4-cyclohexylene may be replaced by —O—; Z 1 is independently a single bond, ethylene, methyleneoxy or carbonyloxy; and m is 1 or 2.