| 摘要 |
Liquid crystal medium (A) comprises a mixture of polar compounds containing at least one specific polycyclic compound (I). Liquid crystal medium (A) comprises a mixture of polar compounds containing at least one specific polycyclic compound of formula (I). R1 = 1-12C alkyl, optionally substituted once by cyano or trifluoromethyl, or by at least one halo, and one or more CH2 may be replaced by oxygen, sulfur, 1,3-cyclobutylene, CH=CH, ethynylene, CO, COO, OCO or OCOO, provided two oxygen atoms are not adjacent; ring (A) = trans-1,4-cyclohexylene, 1,4-phenylene (optionally substituted by 2- or 3-fluoro or by 2,3- or 3,5-difluoro) or 1,3-dioxan-2,5-diyl; L = hydrogen or fluoro; Z1 and Z2 = one of Z1 and Z2 isCOO and the other is CF2O; X = fluoro, chloro, cyano, isocyanate, (iso)thiocyanato, SF5, 1-6C optionally halogenated alkyl or alkoxy, or halogenated alkenyl or alkenyl; u and v = 1 or 2. Independent claims are also included for the following: (1) (I) as new compounds; and (2) electro-optical display devices that contain (A). |
