| 摘要 |
A liquid crystalline medium is based on a mixture of polar compounds having positive or negative dielectric anisotropy and contains one or more compounds (I). <??>A liquid crystalline medium is based on a mixture of polar compounds having positive or negative dielectric anisotropy and contains one or more compounds of formula (I). <??>A<1>, A<2>, A<3> = 1,4-cyclohexenylene or 1,4-cyclohexylene optionally having 1 or 2 non-neighboring CH2 groups replaced by -O- or -S-; a 1,4-phenylene optionally having 1 or 2 CH groups replaced by N; piperidine-1,4-diyl, 1,4-bicyclo(2,2,2)-octylene-, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl, 1,2,3,4-tetrahydronaphthalene-2,6-diyl, phenanthrene-2,7-diyl or fluoren-2,7-diyl all optionally substituted by halogen atoms; <??>A<4> = 1,4-phenylene, 1,4-cyclohexylene or a group of formula (i)-(xi): <??>x, y, z = 0-2; <??>Z<1>-Z<3> = -CO-O-, -O-CO-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CH2CH2-, -(CH2)4-, -C2F4-, -CH2CF2-, -CF2CH2-, -CF=CF-, -CH=CH-, -C IDENTICAL C- or a single bond; <??>X = F, Cl, CN, SF5, NCS or optionally halogen substituted 1-8C alkyl wherein non-neighboring CH2 group(s) may be replaced by -O- or -CH=CH-; <??>a, b, c = 0-2; and <??>a+b+c≤3. <??>An Independent claim is also included for an electrooptical liquid crystal display containing the medium. |
