Patent ID: 7440160

Claim:
An electro-optical light modulation element comprising a substrate or a plurality of substrates, an electrode arrangement, an element or a plurality of elements for polarisation of the light and mesogenic a modulation medium, wherein the light modulation element is operated at the temperature at which the modulation medium in the unaddressed state is in an optically isotropic phase and the mesogenic modulation medium comprises a chiral component, component (A), which consists of one or more chiral compounds, at least one of which has an HTP of 30 μm −1 or more, and the mesogenic modulation medium comprises an achiral component, component (B), which consists of one or more achiral compounds, the light modulation element is operated at the temperature at which the mesogenic modulation medium has a blue phase or the light modulation element is operated at the temperature at which the mesogenic modulation medium is in the isotropic phase, wherein the relative temperature dependence (dV* 70 /dT) of the characteristic voltage for 70% relative contrast (V 10 ) of the modulation medium is 30%/degree or less at a temperature of 2° above the characteristic temperature (T char ) in the range of +/−1° around this temperature.