| abstract |
The invention relates to a liquid-crystalline medium based on a mixture of polar compounds of positive dielectric anisotropy, comprising one or more compounds of the general formula Iand simultaneously one or more compounds of the general formula IIin which R is H or an alkyl or alkoxy radical having 1 to 15 carbon atoms, Y is F, OCF3 or OCHF2, and simultaneously one or more compounds of the formula II in which R', independently of the radical selected in the formula I, is as defined for R, and L is H or F. |