| 摘要 |
<p>The invention relates to supertwist liquid crystal displays (STN-LCDs) having: two plane-parallel carrier plates which, with an edging, form a cell; a nematic liquid crystal mixture of positive dielectric anisotropy in the cell; electrode layers with superimposed orientation layers on the inside of the carrier plates; an angle of incidence between the longitudinal axis of the molecules on the surface of the carrier plates and the carrier plates of about 1 degree to 30 degrees and a twisting angle of the liquid crystal mixture in the cell from orientation layer to orientation layer, according to the amount, of between 160 and 720 °C. The nematic liquid crystal mixture contains one or more compounds of formula (I) wherein R1 is alkyl having 1-12 C atoms, wherein one or two non-adjacent CH¿2? groups can also be replaced by -O-, -CH=CH-, -CO-, -O-CO- or -CO-O-, r is 0 or 1, ring A is trans-1,4-cyclohexylene or 1,4-phenylene, X is F, Cl, CF3, OCF3 or OCHF2 and Y and Z each independently of one another denotes H or F.</p> |
