Patent ID: 7048974
Filing Date: 2006-05-23
Classification: C09K

Abstract:
1. A TN or STN liquid-crystal display comprising two outer plates, which, together with a frame, form a cell, a nematic liquid-crystal mixture of positive dielectric anisotropy located in the cell, electrode layers with alignment layers on the insides of the outer plates, a tilt angle between the longitudinal axis of the molecules at the surface of the outer plates and the outer plates of 0 degree to 30 degrees, and a twist angle of the liquid-crystal mixture in the cell from alignment layer to alignment layer with a value of between 22.5° and 600°, a nematic liquid-crystal mixture comprising a) 15–75% by weight of a liquid-crystalline component A consisting of three or more compounds having a dielectric anisotropy of greater than +1.5; b) 25–85% by weight of a liquid-crystalline component B consisting of one or more compounds having a dielectric anisotropy of between −1.5 and +1.5; c) 0–20% by weight of a liquid-crystalline component D consisting of one or more compounds having a dielectric anisotropy of below −1.5, and d) optionally, an optically active component C in such an amount that the ratio between the layer thickness (separation of the outer plates) and the natural pitch of the chiral nematic liquid-crystal mixture is about 0.2 to 1.3, wherein component A of the liquid-crystal mixture comprises a nematic liquid-crystal mixture comprising: a) one or more compounds of formula I and b) one or more compounds of formula II in which R Y is F, C1 or a halogenated alkyl, alkenyl or alkoxv radical having 1 to 6 carbon atoms, and c) one or more compounds of formulae IIIc to IIIj in which R L