| 摘要 |
A liquid-crystalline medium based on a mixture of polar compounds of positive dielectric anisotropy, characterized in that it comprises one or more compounds of the general formula IA and/or IBin which R<a>, R<b>, Y<a>, Y<b>, Z<a>, Z<b>, L<a>, L<b>, c and d are as defined herein, is suitable for use in MLC, TN and STN displays.
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