Electrooptical system

US6327010A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Bernhard Scheuble · Alsbach, DE
• Gunter Baur · Glückstadt, DE
• Waltraud Fehrenbach · Hersbruck, DE
• Barbara Staudacher · Ettenheim, DE

Key dates

• Filing date: Dec 19, 1996
• Grant date: Dec 4, 2001
• Expiry date: Dec 19, 2016

Classification

• Technology area (CPC G): Physics
• CPC primary: G02F1/133531
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An electrooptical system contains: PA0 (a) a twisted nematic liquid-crystal layer, with an input side and an output side, which is positioned between a first substrate and a second substrate, each of whose inside surface is provided with an electrode coating and an alignment layer thereon, the director of said liquid crystal layer having a parallel edge alignment and a twist angle of 0.degree..ltoreq..beta..ltoreq.1000, PA0 (b) at least one compensation layer for compensating the optical path difference of the liquid-crystal layer d.multidot..DELTA.n, and PA0 (c) at least one device for linear polarization of light in such an arrangement that light, before entering and after exiting the liquid-crystal layer, passes through a polarization device, PA1 I. wherein, in order to achieve high contrast, and/or high brightness, and/or high viewing angle independence of the contrast and/or the color values, the angle .psi., which the polarization device on the input side of the liquid crystal layer forms with the director of the liquid-crystal molecules on the surface of the first substrate, satisfies PA1 I.A. condition (1) or (2) EQU .psi.=(.beta.+90.degree.)/2.+-.10.degree. (1) EQU .psi.=.…