| 摘要 |
The invention relates to a liquid-crystalline medium based on a mixture of polar compounds of positive dielectric anisotropy, characterised in that it comprises one or more compounds of the formula I and one or more compounds of the formula IA in 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.
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