Patent ID: 8394294

Claim:
A liquid crystal compound represented by formula (a): wherein, in formula (a), R 1 and R 2 are each independently hydrogen, alkyl having 1 to 10 carbons, alkenyl having 2 to 10 carbons, alkoxy having 1 to 9 carbons, alkoxyalkyl having 2 to 9 carbons or alkenyloxy having 2 to 9 carbons; ring A 1 and ring A 2 are each independently 1,4-phenylene, trans-1,4-cyclohexylene, tetrahydropyran-2,5-diyl, tetrahydropyran-3,6-diyl, 1,3-dioxane-2,5-diyl, 1,3-dioxane-3,6-diyl, pyrimidine-2,5-diyl, pyrimidine-3,6-diyl, pyridine-2,5-diyl or pyridine-3,6-diyl; L 1 and L 2 are each independently hydrogen or fluorine, and at least one of L 1 and L 2 is fluorine; when one of ring A 1 and ring A 2 is 1,4-phenylene, the other is trans-1,4-cyclohexylene, tetrahydropyran-2,5-diyl, tetrahydropyran-3,6-diyl, 1,3-dioxane-2,5-diyl, 1,3-dioxane-3,6-diyl, pyrimidine-2,5-diyl, pyrimidine-3,6-diyl, pyridine-2,5-diyl or pyridine-3,6-diyl; and Z 1 and Z 2 are each independently a single bond, —(CH 2 ) 2 —, —CH═CH—, —C≡C—, —CH 2 O—, —OCH 2 —, —COO— or —OCO—.