Liquid-crystalline medium

摘要

A liquid-crystalline medium based on a mixture of polar compounds of positive dielectric anisotropy, which contains: one or more compounds of the general formula I in which R, Y, Z and n are as defined in claim 1, one or more compounds of the following formulae IIa, IIb, IIc and IId and one or more compounds of the formula in which R^o, X^o, Y² and r are as defined in claim 1.