| 摘要 |
A liquid crystal medium based on polar compounds with positive dielectric anisotropy contains one or more compounds with one or two trans-1,4-cyclohexylene group(s) and a terminal 3,3-difluorocyclobut-1-yl group, possibly connected by one or two spiro-linked cyclobutane-1,3-diyl groups. A liquid crystal (LC) medium based on a mixture of polar compounds with positive dielectric anisotropy contains one or more compounds of formula (I). R = H, 1-15C alkyl or 2-15C alkenyl (optionally substituted with one CN or CF3 group or at least one halogen atom and optionally with one or more CH2 groups replaced by -O-, -S-, cyclobutane-1,3-diyl, -CO-, -COO-, -OCO- or -OCOO- with no direct bond between oxygen atoms); m = 0 or 1; n = 0, 1 or 2; and (m+n) = 1, 2 or 3 An Independent claim is also included for electro-optical LC displays containing an LC medium as described above. |
