Active matrix liquid crystal display

US6593904B1 · kind B1 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Michael Marz · Waiblingen, DE
• Klaus Wammes · Osthofen, DE

Key dates

• Filing date: Dec 4, 2000
• Grant date: Jul 15, 2003
• Expiry date: Dec 4, 2020

Classification

• Technology area (CPC G): Physics
• CPC primary: G09G2380/10
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

In an active matrix liquid crystal display having liquid crystal cells arranged in rows and columns. One side of the liquid crystal cells is in contact with a common reference potential and it being possible to switch gray-scale signals through on the other side. In order to increase the voltage range within which the liquid crystal cells can be operated without distortion of the image rendering, a correction device is provided which distorts the gray-scale signals reaching the liquid crystal cell based on information concerning the typical dependence between the optical transparence of the liquid crystal cells and the voltage applied to them and as a function the potential difference between the gray-scale signals and the reference potential in such a way that an at least approximately linear relationship results between the optical transparence of the liquid crystal cells and the undistorted gray-scale signals.