Process for producing ferroelectric liquid-crystal cells

US5361152A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Takamasa Harada · Oberursel, DE
• Claus Escher · Mühltal, DE
• Gerhard Illian · Frankfurt am Main, DE
• Dieter Ohlendorf · Liederbach, DE
• Heinz Rieger · Hofheim, DE
• Norbert Rosch · Frankfurt am Main, DE

Key dates

• Filing date: Feb 5, 1993
• Grant date: Nov 1, 1994
• Expiry date: Feb 5, 2013

Classification

• Technology area (CPC G): Physics
• CPC primary: G02F1/1341
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A process for producing a liquid-crystal cell which comprises the steps of: PA0 (a) providing a curable sealant portion in the periphey of the side of an electrode plate that has an electrode or electrodes; PA0 (b) (i) coating a ferroelectric liquid-crystal composition on the portion surrounded by said sealant portion, with a spacer being preliminarily provided in said portion; PA1 (ii) coating spacer-containing ferroelectric liquid-crystal composition on the portion surrounded by said sealant portion; or PA1 (iii) coating a ferroelectric liquid-crystal composition on the portion surrounded by said sealant portion and thereafter providing a spacer over said composition; PA0 (c) defoaming the coated layer of the liquid-crystal composition by heating during or after evacuation; PA0 (d) placing the other electrode plate in such a way that the side of said other electrode plate which has an electrode or electrodes faces the side of said one electrode plate containing the thermally defoamed coated layer of the liquid-crystal composition and compressing the two electrode plates together; and PA0 (e) curing said sealant.