Compounds of the formula I, and a liquid-crystalline medium, preferably having a nematic phase and negative dielectric anisotropy, which comprises
a) one or more compounds of the formula I
and
b) one or more compounds of the formula II
in which the parameters have the respective meanings indicated in Claim 1. The use thereof in an electro-optical display, particularly in an active-matrix display based on the VA, ECB, PALC, FFS or IPS effect. Displays of this type which contain a liquid-crystalline medium of this type. Use of the compounds of the formula I for the stabilization of a liquid-crystalline medium which comprises one or more compounds of the formula II.
式 I 的化合物和一种液晶介质,最好具有向列相和负介电各向异性,其中包括
a) 一种或多种式 I 化合物
和
b) 一种或多种式 II 的化合物
其中各参数的含义如权利要求 1 所述。在光电显示器中使用,特别是在基于 VA、
ECB、PALC、FFS 或 IPS 效果的有源矩阵显示器中使用。含有此类液晶介质的显示器。使用式 I 化合物稳定包含一种或多种式 II 化合物的液晶介质。