Electrooptical system

US5356557A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Raymond Jubb · Darmstadt, DE
• Ulrich Finkenzeller · Plankstadt, DE
• Eike Poetsch · Mühltal, DE
• Stefan Wilhelm · Unterhaching, DE

Key dates

• Filing date: Mar 13, 1992
• Grant date: Oct 18, 1994
• Expiry date: Mar 13, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2019/3422
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to an electrooptical system which contains, between 2 electrode layers, a liquid-crystal mixture and a further optically transparent polymeric medium, 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, PA1 whose liquid-crystal molecules have an irregular alignment in the switched-off state, PA1 in which one of the refractive indices of the liquid-crystal mixture essentially corresponds to the refractive index of the medium n.sub.m and/or in which the quotient of the mass of the liquid-crystal mixture and the mass of the optically transparent medium is 1.5 or more, and PA1 which has reduced transmission in one of the two switching states compared with the other state, irrespective of the polarization of the incident light, where the liquid-crystal mixture contains at least one compound of the formula I, defined herein, and, in order to increase the solubility of the liquid-crystal mixture in the precursor, the precursor of the medium contains between 0.1% and 95.0% of a component A which comprises one or more fluorinated, oligofl…