Supertwist liquid crystal display

Supertwist liquid crystal display with

• two plane-parallel carrier plates which, with a frame, form a cell,
• a nematic liquid crystal mixture, located in the cell, having a positive dielectric anisotropy,
• electrode layers with superposed orientation layers on the insides of the carrier plates,
• a tilt angle of about 1 degree to 30 degrees between the longitudinal axis of the molecules at the surface of the carrier plates and the carrier plates, and
• a twist angle of the liquid crystal mixture in the cell from orientation layer to orientation layer of an amount between 100.degree. and 600.degree., characterized in that the nematic liquid crystal mixture consists of
• a) component A containing one or more compounds selected from group A consisting of compounds of the formulae IIa to IIk:
• ##STR43## in which R.sup.1 is n-alkyl or n-alkenyl having up to 9 C atoms,
• X is cyano, --NCS, F, Cl, --CF.sub.3, --CHF.sub.2, --OCF.sub.3, --OCHF.sub.2, --OCF.sub.2 CF.sub.2 H or --OC.sub.2 F.sub.5, and the rings A.sup.1, A.sup.2 and A.sup.3 each independently of one another are 1,4-phenylene, 2- or 3-fluoro-1,4-phenylene or trans-1,4-cyclohexylene, or one of the rings A.sup.1, A.sup.2 and A.sup.3 is 1,4-cyclohexenylene, pyridine-2,5-diyl or pyrimidine-2,5-diyl,
• b) 0-40% by weight of a liquid-crystalline component B, consisting of one or more compounds having a dielectric anisotropy from -1.5 to +1.5, of the general formula I ##STR44## in which R.sup.1 and R.sup.2 each independently of one another are n-alkyl, n-alkoxy, n-oxaalkyl, .omega.-fluoroalkyl or n-alkenyl having up to 9 C atoms, the rings A.sup.1, A.sup.2 and A.sup.3 each independently of one another are 1,4-phenylene, 2- or 3-fluoro-1,4-phenylene, trans-1,4-cyclohexylene or 1,4-cyclohexenylene,
• Z.sup.1 and Z.sup.2 each independently of one another are --CH.sub.2 CH.sub.2 --, --C.tbd.C-- or a single bond, and m is 0, 1 or 2
• c) an optically active component D in such a quantity that the ratio of cell thickness (spacing of the plane-parallel carrier plates) to the natural pitch of the chiral nematic liquid crystal mixture is about 0.2 to 1.3, and in that the nematic liquid crystal mixture has a nematic phase range of at least 60.degree. C., a viscosity of not more than 35 mPa.s, an optical birefringance (n) of at least 0.1115 and a dielectric anisotropy of at least +1 at 20.degree. C.