US 2010/0073621 A1 · LIQUID CRYSTALLINE COMPOUND, LIQUID CRYSTAL COMPOSITION, LIQUID CRYSTAL DISPLAY ELEMENT

Abstract

The invention provides a liquid crystal compound which has stability to heat, light and so forth, shows liquid crystal phases in a wide temperature range, and has a small viscosity, an appropriate optical anisotropy, a large dielectric anisotropy, and an excellent compatibility with other liquid crystal compounds. The invention provides a liquid crystal composition which has an appropriate optical anisotropy, an appropriate dielectric anisotropy, a low threshold voltage, and a high maximum temperature and a low minimum temperature of a nematic phase. The invention provides a liquid crystal display device which has a short response time, a small power consumption, a small driving voltage, and a large contrast, and can be used in a wide temperature range. The liquid crystal compound is a halogeno-benzene derivative having a trifluoropropenyl group or trifluoropropynyl group at a side chain, such as, for example, trans-4′-[3,5-difluoro-4-(3,3,3-trifluoropropenyl)phenyl]-trans-4-propylbicyclohexyl. The liquid crystal composition contains a compound which is this derivative. The liquid crystal display device uses this liquid crystal composition.

Claims30

Dependent claims

A compound represented by formula (1):

wherein R is hydrogen, alkyl having 1 to 12 carbons, alkenyl having 2 to 12 carbons, alkoxy having 1 to 11 carbons, or alkenyloxy having 2 to 11 carbons;
ring A1, ring A2, and ring A3 are each independently 1,4-cyclohexylene, 1,4-phenylene, 1,4-cyclohexenylene, 1,3-dioxane-2,5-diyl, tetrahydropyran-2,5-diyl, pyrimidine-2,5-diyl, pyridine-2,5-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl, or 1,2,3,4-tetrahydronaphthalene-2,6-diyl, and in these rings, hydrogen may be replaced by halogen;
Z1, Z2, and Z3 are each independently a single bond, —CH2CH2—, —CH═CH—, —C≡C—, —COO—, —OCO—, —CF2O—, —OCF2—, —CH2O—, —OCH2—, —CF═CF—, —(CH2)4—, —(CH2)2CF2O—, —OCF2(CH2)2—, —CH═CH(CH2)2—, or —(CH2)2CH═CH—;
L1 and L2 are each independently hydrogen or halogen, and at least one of L1 and L2 is halogen;
W is —CH═CH— or —C≡C—;
and
n and m are each independently an integer of 0 to 2, and the sum of n and m is an integer of 0 to 3.

4 more elements

Dependencies are inferred from the claim text.

Liquid crystalline compound, liquid crystal composition, liquid crystal display element

Life of this patent

Liquid crystalline compound, liquid crystal composition, liquid crystal display element

Life of this patent

Abstract

Claims30