Liquid-crystalline medium and liquid-crystal display comprising 1,2-difluoroethene compounds

US7651742B2 · kind B2 · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Michael Wittek · Darmstadt, DE
• Markus Czanta · Darmstadt, DE
• Harald Hirschmann · Darmstadt, DE
• Volker Reiffenrath · Roßdorf, DE

Key dates

• Filing date: May 18, 2006
• Grant date: Jan 26, 2010
• Expiry date: Jun 19, 2026

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2323/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to a liquid-crystalline medium comprising 1,2-difluoroethene compounds of the general formula I, in which R1, ring A, Z1, Z2, m, X and L1-6 are as defined in claim 1. The invention also relates to the use of the medium for electro-optical purposes and to displays containing this medium. Novel 1,2-difluoroethene compounds having 3 or more rings are disclosed.