| abstract |
The invention pertains to a liquid-crystalline medium based on a mixture of polar compounds exhibiting positive dielectric anisotropy, the medium being characterised in that it comprises one or more compounds of general formula (I) in which: R is H, or an alkyl or alkenyl group with 1-15 carbon atoms which is either unsubstituted or substituted singly by CN or CF3 or at least singly substituted by halogen, a condition being that one or more CH2 groups in these groups can be replaced independently of one another by -O-, -S-, (a), -CO-, -CO-O-, -O-CO- or -O-CO-O- in such a way the O atoms are not directly linked to one another; Y is F, Cl, or alkyl, alkenyl or alkoxy halide with 1-6 carbon atoms and L<1> is H or F. |