abstract |
The invention relates to a liquid-crystalline medium based on a mixture of polar compounds of positive dielectric anisotropy, characterized in that it comprises one or more compounds of the formula I n nand one or more compounds of the formula IAn n nin which R 1 , R 2 , ring A, ring B, L 1-4 , Z 1 , Z 2 , X 1 and X 2 are as defined in claim 1. |