Electrooptical system
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United States of America Patent
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Dec 16, 1997
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Jul 27, 1994
filing date -
Sep 13, 1991
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Abstract
The invention relates to an electrooptical system which between 2 electrode layers contains a liquid crystal mixture and a further optically transparent polymer medium, in which one of the electrode layers is in the form of an active matrix having nonlinear addressing elements integrated with the image point, while the other electrode layer forms the counter electrode, 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 n.sub.m 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 is one of the two switching states has reduced transmission compared with the other state independently of the polarization of the incident light, in which the liquid crystal mixture contains at least one compound of the formula I and the absolute value of the difference between the solubility parameter of the liquid crystal mixture and the solubility parameter of the precursor of the optically transparent polymer medium does not exceed 1.5 at room temperature.
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