Electrooptical liquid crystal system

摘要

The invention relates to an electrooptical liquid crystal system which between two electrode layers there is contained a liquid crystal mixture and a further optically transparent polymer medium, whose liquid crystal molecules have irregular orientation in the switched-off state, in which one of the refractive indices of the liquid crystal mixture is substantially the same as the refractive index of the medium nm and/or in which the quotient from the weight of the liquid crystal mixture and the weight of the optically transparent medium is 1.5 or more, which in one of the switching states has reduced transmission compared with the other state essentially independent of the polarization of the incident light, and whose liquid crystal mixture contains at least one dielectrically neutral and at least one dielectrically positive liquid crystalline or monotropic compound, characterized in that the liquid crystalline mixture contains less than 15% by weight of one or more dielectrically positive liquid crystalline, enantiotropic or monotropic, two-ring compounds in order to lower the solubility of the liquid crystal mixture in the medium.