Patent ID: 7608199

Claim:
A liquid crystal composition with a negative dielectric anisotropy, comprising at least one compound selected from the group of compounds represented by the following formula (1) as a first component, and at least one compound selected from the group of compounds represented by the following formulas (2-1) to (2-3) and (3-1) to (3-4) as a second component: wherein R 1 is alkyl or alkenyl; R 2 is alkyl, alkenyl, or alkoxy; R 3 is alkyl, alkenyl, alkoxy, or —COO—R 4 , in which R 4 is alkyl; R 5 is alkyl, alkenyl, alkoxy, or alkoxymethyl; Z 1 and Z 2 are independently a single bond, —CH 2 O—, —OCH 2 —, —(CH 2 ) 2 —, —(CH 2 ) 4 —, —CF 2 O—, —OCF 2 —, —C 2 H 4 CF 2 O—, —C 2 H 4 OCF 2 —, —CF 2 OC 2 H 4 —, or —OCF 2 C 4 —; Z 3 is a single bond or —COO—; A 1 is 1,4-cyclohexylene or 1,4-phenylene; A 2 and A 3 are independently 1,4-cyclohexylene, 1,4-phenylene, 1,4-phenylene in which any hydrogen may be replaced by fluorine, or 2-difluoromethyl-3-fluoro-1,4-phenylene; A 4 is 1,4-cyclohexylene, 1,4-phenylene, or 1,4-phenylene in which a hydrogen is replaced by a fluorine; A 5 is 1,4-phenylene or 1,4-phenylene in which a hydrogen is replaced by a fluorine; A 6 is 2-fluoro-1,4-phenylene; n is 0 or 1; in the formula (1), when n is 0, A 2 is 2-difluoromethyl-3-fluoro-1,4-phenylene, and Z 2 is a single bond; and in the formula (1), when n is 1, one of A 2 and A 3 is 2-difluoromethyl-3-fluoro-1,4-phenylene, and one of Z 1 and Z 2 is a single bond, wherein the first component is at least one compound selected from the group of compounds represented by the following formulas (1-1) to (1-12): R 1 -A 1 -Z 4 -A 7 -(A 8 ) n -R 2 (1-1) R 1 -A 1 -Z 5 -A 7 -(A 8 ) n -R 2 (1-2) R 1 -A 1 -Z 6 -A 7 -(A 8 ) n -R 2 (1-3) R 1 -A 1 -Z 4 -A 8 -A 7 -R 2 (1-4) R 1 -A 1 -Z 5 -A 8 -A 7 -R 2 (1-5) R 1 -A 1 -Z 6 -A 8 -A 7 -R 2 (1-6) R 1 -A 1 -A 8 -Z 4 -A 7 -R 2 (1-7) R 1 -A 1 -A 8 -Z 5 -A 7 -R 2 (1-8) R 1 -A 1 -A 8 -Z 6 -A 7 -R 2 (1-9) R 1 -A 1 -A 7 -Z 4 -A 8 -R 2 (1-10) R 1 -A 1 -A 7 -Z 5 -A 8 -R 2 (1-11) R 1 -A 1 -A 7 -Z 6 -A 8 -R 2 (1-12) wherein R 1 is alkyl or alkenyl; R 2 is alkyl, alkenyl, or alkoxy; Z 4 is a single bond, —CH 2 O—, or —OCH 2 —; Z 5 is —(CH 2 ) 2 — or —(CH 2 ) 4 —; Z 6 is —CF 2 O—, —OCF 2 —, —C 2 H 4 CF 2 O—, —C 2 H 4 OCF 2 —, —CF 2 OC 2 H 4 —, or —OCF 2 C 2 H 4 —; A 1 is 1,4-cyclohexylene or 1,4-phenylene; A 7 is 1,4-phenylene in which a hydrogen is replaced by a fluorine, or 2-difluoromethyl-3-fluoro-1,4-phenylene; A 8 is 1,4-cyclohexylene, 1,4-phenylene, 1,4-phenylene in which a hydrogen is replaced by a fluorine, or 2-difluoromethyl-3-fluoro-1,4-phenylene; one of A 7 and A 8 is 2-difluoromethyl-3-fluoro-1,4-phenylene; n is 0 or 1; and in the formulas (1-1) to (1-3), when n is 0, A 7 is 2-difluoromethyl-3-fluoro-1,4-phenylene, and wherein, in the formula (1-1), Z 4 is a single bond, A 1 is 1,4-cyclohexylene, A 7 is 2-difiuoromethyl-3-fluoro-1,4-phenylene, and n is O.