Liquid-crystal medium

A liquid crystal display comprising:

• two substrates, at least one which is transparent to light;
• an electrode provided on each substrate or two electrodes provided on only one of the substrates;
• and
• located between the substrates a layer of a liquid-crystal medium;
• the liquid-crystal medium comprising:
• a liquid-crystalline host containing a liquid crystal component, and
• an optically active component,
• wherein the liquid crystal component comprises one or more compounds of formula CPY-n-Om, one or more compounds of formula PY-n-Om and one or more compounds of formula PYP-n-m in a total concentration in the range of from 45 to 70%:
• wherein m and n are each, independently of each other, an integer from 1 to 12,
• wherein the liquid crystal medium has negative dielectric anisotropy and the molecules in the layer of the liquid crystal medium in the switched-off state are aligned perpendicular to the electrode surfaces or have a tilted homeotropic alignment, the liquid-crystalline host has a chiral pitch, p, in the range of from 8 to 30 μm, the liquid crystal component has a birefringence Δn in the range of from 0.110 to 0.150;
• wherein the display has a cell gap and the thickness, d, of the cell gap is in the range of from 3 μm to 5 μm;
• and
• wherein the ratio d/p between the thickness of the cell gap d and the chiral pitch p is 0.1 to 1.