Electrooptical system

In an electrooptical system comprising:

• two electrode layers, a liquid-crystal mixture and an optically transparent polymeric medium between said electrode layers, one of the electrode layers being formed as an active matrix having nonlinear addressing elements integrated into the pixel, while the other electrode layer forms the counterelectrode;
• wherein the liquid-crystal molecules of said liquid-crystal mixture have an irregular alignment in the switched-off state;
• wherein one of the refractive indices of said liquid-crystal mixture essentially corresponds to the refractive index n.sub.m, of said polymeric medium and/or wherein the quotient of the mass of said liquid-crystal mixture divided by the mass of said optically transparent polymeric medium is 1.5 or more;
• and
• wherein said system has reduced transmission in one of the two switching states compared with the other state, irrespective of the polarization of the incident light;
• the improvement comprising:
• said liquid-crystal mixture contains one or more compounds of the formula I ##STR26## wherein Z.sup.1 and Z.sup.2 are each, independently, a single bond, --CH.sub.2 CH.sub.2 --, --COO--, --OCO-- or --C.dbd.C--, ##STR27## are each independently, trans-1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene, 2,3-difluoro-1,4-phenylene or 3,5-difluoro-1,4-phenylene, and one of ##STR28## can also be pyrimidine-2,5-diyl, pyridine-2,5-diyl or trans-1,3-dioxane-2,5-diyl,
• X.sup.1, X.sup.2, X.sup.3 and X.sup.4 are each, independently, H or F,
• Q is CF.sub.2, OCF.sub.2, C.sub.2 F.sub.4, OC.sub.2 F.sub.4, or a single bond,
• Y is H, F or Cl
• n is 0, 1 or 2, and
• R is alkyl having up to 12 carbon atoms in which one or two non-adjacent CH.sub.2 groups can be replaced by --O--and/or --CH.dbd.CH--;
• and
• to increase the solubility of said liquid-crystal mixture in the precursor of said polymeric medium, said precursor contains 0.1%-95.0% of a component A, wherein component A comprises one or more fluorinated, oligofluorinated, or perfluorinated monomers, one or more fluorinated, oligofluorinated, or perfluorinated oligomers one or more fluorinated, oligofluorinated, or perfluorinated prepolymers, or combinations thereof.