LC medium

An LCOS display, comprising a silicon-containing backplane (1), a reflective coating (2) in the shape of a pixel array, first (3) and second (4) alignment layers providing planar alignment, a layer (5) of the LC medium, a transparent electrode layer (6), and a transparent substrate (7), and in said LCOS display an LC medium with positive dielectric anisotropy, said medium comprising one or more compounds of formula I, one or more compounds of formulae II or III, and one or more chiral dopants

• wherein the individual radicals, independently of each other and on each occurrence identically or differently, have the following meanings
• “alkyl” C1-6-alkyl,
• Ra1 H, CH3 or C2H5,
• i, k 0, 1, 2 or 3,
• R0 an unsubstituted or halogenated alkyl or alkoxy radical having 1 to 15 C atoms, where, in addition, one or more CH2 groups in these radicals may each be replaced, independently of one another, by —C≡C—, —CF2O—, —CH═CH—,
• —O—, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another, or denotes
• X0 F, Cl, CN, SF5, SCN, NCS, a C1-6-halogenated alkyl radical, a C2-6-halogenated alkenyl radical, a C1-6-halogenated alkoxy radical or a C2-6-halogenated alkenyloxy radical, and
• Y0 H or CH3,
• Y1-6 H or F,
• said display having a helical twisting power and an amount of the chiral dopant in the LC medium are selected such that the display has a ratio d/p of 0.015 to 0.2.