| 摘要 |
Compounds of formula (I): R<1>-A<1>-Z<1>-A-O-R<2>, where R<1> and R<2> are each independently alkyl with 1 to 9 carbon atoms, in which one or two CH2 groups may be replaced by -O-, -CO-, -O-CO-, -CO-O- and/or -CH=CH-, whereby two O atoms are not directly linked to each other, one of the two groups R<1> and R<2> is also H, Z<1> is -CH2-O-, -OCH2-, -CH2CH2- or a simple bond, A<1> is trans-1,4-cyclohexylene, in which one or two non-adjacent CH2 groups may be replaced by O and/or S, or 1,4-cyclohexenylene, and A is unsubstituted or fluorine-substituted 1,4-phenylene, can be used as components of crystalline liquid dielectrics with at least three crystalline liquid compounds for reduction of the turn-on time Ton of electro-optical display elements based on a TN-cell during commutation of a first voltage, which is less than or approximately equal to the threshold voltage, to a second voltage, which lies on the positive slope of the electro-optical charcteristic curve.
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