| abstract |
The invention relates to compounds of the formula I and to a liquid-crystalline medium which comprises one or more compounds of the formula I, n n n n n n n n n n in which R 1 , X 1 , X, Y 1 and Y 2 have the meanings indicated in Claim 1 , and to the use thereof for electro-optical purposes, in particular for shutter glasses, 3D applications, in TN, PS-TN, STN, TN-TFT, OCB, IPS, PS-IPS, FFS, PS-FFS and PS-VA-IPS displays. |