| 摘要 |
The invention relates to a liquid-crystalline medium based on a mixture of polar compounds having negative dielectric anisotropy, which contains at least one compound of formula I wherein R1 and R2 are independently of each other an alkyl, alkoxy or alkenyl group with 1 to 12 C atoms, it also being possible for one or more CH2 groups in these radicals to be replaced, in each case independently of one another, by -O-, -CH=CH-, -CO-, -OCO- or -COO- in such a manner that oxygen atoms are not linked directly to one another, Z is OCH2 or CH2O, and m is 0 or 1.
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