US 6,210,761 B1 · Liquid crystal compounds exhibiting negative anisotropy of permittivity, liquid crystal compositions, and liquid crystal displays

Abstract

The present invention is to provide liquid crystalline compounds which exhibit a negative dielectric anisotropy value, have an extremely high voltage holding ratio and a low threshold voltage, are remarkably small in their dependency on temperature, hardly exhibit smectic phase, and are excellent in miscibility with other liquid crystal materials; to provide liquid crystal compositions comprising the liquid crystalline compound; and to provide liquid crystal display devices fabricated by using the liquid crystal composition; the liquid crystalline compounds are expressed by the following general formula (1) wherein Ra, Rb, Y1 to Y6, Z1 and Z2 are herein defined.

Claims12

Dependent claims

A liquid crystalline compound expressed by the general formula (1)

wherein Ra and Rb each independently represent a straight chain or branched alkyl group having 1 to 20 carbon atoms in which alkyl group any non-adjacent methylene group (—CH2—) may be replaced by oxygen atom;
Y1, Y2, Y3, Y4, Y5 and Y6 each independently represent hydrogen atom or fluorine atom provided that at least three of Y1, Y2, Y3, Y4, Y5 and Y6 represent fluorine atom;
Z1 and Z2 independently represent —(CH2)2—, —(CH2)4—, —CH2O—, —(CH2)3O— or single bond provided that in no case do Z1 and Z2 each simultaneously represent single bond;
and any atom which constitutes the compound may be replaced by its isotope.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

09/319,008Filed 28 May 1999

Priority

JP 8-33276728 Nov 1996

Granted

3 Apr 2001

Term ends

Not estimatedThe source records don’t support an estimate.

Classification13 codes

C09K 19/12
Containing at least two benzene rings: at least two benzene rings directly linked, e.g. biphenyls
C07C 25/18
Compounds containing at least one halogen atom bound to a six-membered aromatic ring: polycyclic aromatic halogenated hydrocarbons
C07C 43/225
Having an ether-oxygen atom bound to a carbon atom of a six-membered aromatic ring: containing halogen
C09K 19/14
Containing at least two benzene rings: linked by a carbon chain

Liquid crystal compounds exhibiting negative anisotropy of permittivity, liquid crystal compositions, and liquid crystal displays

Life of this patent

Liquid crystal compounds exhibiting negative anisotropy of permittivity, liquid crystal compositions, and liquid crystal displays

Life of this patent

Abstract

Claims12