Liquid-crystal media and PNLC light modulation element

A Cholesteric LC Medium for a PNLC light modulation element comprising

• A) one or more polymerisable compounds in an amount of 2% to 10% by weight, wherein at least one of said one or more polymerisable compounds is a compound of formula I,
• P11-Sp11-Ar-Sp12-P12
• wherein
• Ar is one of the following groups
• which is optionally substituted by one or more groups L,
• L is on each occurrence identically or differently F, Cl, CN, P-Sp-, or a straight chain alkyl having 1 to 25 C atoms or a branched or cyclic alkyl having 3 to 25 C atoms, wherein one or more non-adjacent CH2-groups are optionally replaced by —O—, —S—, —CO—, —CO—O—, —O—CO—, or —O—CO—O— in such a manner that O- and/or S-atoms are not directly connected with each other, and wherein one or more H atoms are each optionally replaced by F or Cl,
• P11 and P12 denote each and independently from another a polymerisable group,
• Sp11 and Sp12 denote each and independently from another a spacer group that is optionally substituted by one or more groups P11 or P12, or a single bond, and
• B) one or more non-polymerisable mesogenic or liquid-crystalline compounds, and
• C) one or more non-polymerisable chiral compounds in an amount of 0.1% to 0.9% by weight.