Liquid-crystal displays and liquid-crystalline media having homeotropic alignment

US9726933B2 · kind B2 · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Graziano Archetti · Darmstadt, DE
• Andreas Taugerbeck · Darmstadt, DE
• Renate Bender · Darmstadt, DE
• Rocco Fortte · Frankfurt am Main, DE
• Peer Kirsch · Darmstadt, DE
• Izumi Saito · Darmstadt, DE

Key dates

• Filing date: Nov 26, 2013
• Grant date: Aug 8, 2017
• Expiry date: Nov 26, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G02F1/133742
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to liquid-crystalline media (LC media) having negative or positive dielectric anisotropy comprising self-alignment additives (SAMs) with an at least one bifunctional or polyfunctional anchor group, which effects the homeotropic (vertical) alignment of the LC media at a surface or the cell walls of a liquid-crystal display (LC display). The invention therefore also encompasses LC displays having homeotropic alignment of the liquid-crystalline medium (LC medium) without conventional imide alignment layers. The LC media may be supplemented by a polymerizable or polymerized component, which serves for stabilization of the alignment, for adjustment of the tilt angle and/or as passivation layer.