abstract |
The invention relates to a liquid crystalline medium based on a mixture of polar compounds with a positive dielectric anisotropy which contains one or more compounds of general formula (I) in which: R is alkyl, oxaalkyl, fluoroalkyl or alkenyl with up to 7 C atoms; X is F, Cl, CF3, OCF3 or OCHF2; and L1 to L4 are independently fluorine or hydrogen. |