| 摘要 |
Twisted nematic or supertwisted nematic liquid crystal (LC) displays in which LC mixture contains at least one 4-(4-alkenylcyclohexyl)-biphenyl derivative substituted in 4' position with 1-12C alkyl, alkoxy or alkenyl (optionally with 1 or 2 non-adjacent CH2 groups replaced by O, CH=CH, CO, OCO or COO). Twisted nematic or supertwisted nematic liquid crystal (LC) displays with two base plates (plus an edge) forming a cell, a nematic LC mixture with positive dielectric anisotropy ( DELTA e) in the cell, electrode layers with orientation layers on inside of base plates, an angle of 0-30 degrees between base plates and long axis of molecules on their surface, a LC mixture twist angle of 22.5-600 degrees from orientation layer to orientation layer and a nematic LC mixture containing: (A) 15-80 wt% LC compound(s) with a DELTA e value of more than +1.5; (B) 20-85 wt% compound(s) with a DELTA e of -1.5 to +1.5; (C) 0-20 wt% compound(s) with a DELTA e of less than -1.5; and optionally (D) optically active component in amounts such that the ratio between layer thickness (baseplate spacing) and the natural pitch of the chiral LC mixture is 0.2-1.3, in which the LC mixture contains at least one compound of formula (I). R<3> = 2-7C alkenyl; R<4> = 1-12C alkyl, alkoxy or alkenyl in which 1 or 2 non-adjacent CH2 groups may be replaced by -O-, -CH=CH-, -CO-, -OCO- or -COO- with no direct link between oxygen atoms. |
