| abstract |
The present invention relates to a liquid crystal medium based on a mixture of polar compounds having a positive dielectric anisotropy, characterized in that it comprises one or more compounds of the formula (Ia) and one or more compounds of the formulan n n [Formula 1a]n n n n n n n n [Chemical Formula 1b]n n n n n n n n Wherein R is an unsubstituted alkenyl radical having from 2 to 12 carbon atoms and wherein one or more CH 2 groups in these radicals may be replaced by -O-, And Y is F, Cl, a halogenated alkyl having 1 to 6 carbon atoms, alkenyl or alkoxy, L is H or F, and s is 1 to 8. |