Liquid-crystalline medium

US8277907B2 · kind B2 · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Melanie Klasen-Memmer · Heuchelheim, DE
• Sabine Schoen · Darmstadt, DE

Key dates

• Filing date: Jun 28, 2011
• Grant date: Oct 2, 2012
• Expiry date: Jun 28, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2019/305
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to a liquid-crystalline medium based on a mixture of polar compounds having negative dielectric anisotropy (Δ∈), which is distinguished by the fact that it has a value for the ratio γ1/Δn2 in the range 6-45 with a clearing point of >60° C. and a Δ∈ of ≦−2.3. Media of this type are particularly suitable for electro-optical displays having active-matrix addressing based on the ECB, PA LCD, FFS or IPS effect.