Liquid crystalline medium with very high resistivity and low threshold potential - based on polar cpds. with positive dielectric anisotropy contains cyclohexyl-cyclohexyl-di:fluoro-bi:phenyl cpds., useful for electro-optical purposes, pref. LCD, e.g. matrix or STN display

摘要

Liquid crystalline (LC) medium based on a mixt. of polar cpds. with positive dielectric anisotropy contains 4'-(trans-cyclohexyl)-cyclohexyl-2,2'-difluorobiphenyl cpd(s). of formula (I); in which R = H or 1-15 C alk(en)yl, opt. mono-substd. by CN or CF3 or at least mono-substd. by halogen, in which CH2 gp(s). may be replaced by -O-, -S-,1,3-cyclobutylene, -CO-, -CO-O-, -O-CO- or -O-CO-O- without adjacent O atoms; Y = F, Cl or 1-6 C halogenated alkyl, alkenyl or alkoxy; L1 = H or F.