Supertwist liquid-crystal display

US6054193A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Harald Hirschmann · Darmstadt, DE
• Marcus Reuter · Darmstadt, DE
• Volker Reiffenrath · Roßdorf, DE

Key dates

• Filing date: Jul 6, 1998
• Grant date: Apr 25, 2000
• Expiry date: Jul 6, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2323/02
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Supertwist liquid-crystal displays having excellent properties are obtained if the nematic liquid-crystal mixture comprises at least one compound of the formula I: ##STR1## and at least one compound of the formula I.sup.* : ##STR2## in which R.sup.1 is alkyl, alkoxy, alkenyl or alkenyloxy having 1 to 12 carbon atoms, PA1 R.sup.2 is alkyl or alkoxy having 1 to 8 carbon atoms, PA1 Z is --COO--, --CH.sub.2 CH.sub.2 or a single bond, PA1 one of the radicals L.sup.1 and L.sup.2 is F and the other is H, PA1 Alkenyl.sup.* is an alkenyl radical having up to 7 carbon atoms, PA1 L.sup.* is H or F, and PA1 R.sup.* is F or an alkyl group having 1 to 12 carbon atoms which is unsubstituted or non-substituted.