Power saving drive mode for bi-level video
US9373297B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 14, 2012 |
| Grant date | Jun 21, 2016 |
| Priority date | — |
| Expiry date | May 29, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2310/027
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Liquid crystal display (LCD) driver circuits, and corresponding driving methods, having selectable grayscale and bi-level modes, that also provide DC restore are presented, including an example embodiment driver circuit having selectable direct current (DC) restore voltage switches including a digital to analog converter, a high voltage video signal path including a high voltage video amplifier, a set of high voltage level switches, a high voltage capacitor and a low voltage video signal path including a low voltage video amplifier, a set of low voltage level switches, a low voltage capacitor. Advantages include, for some applications, a display operates in a bi-level mode saving power relative to operating in a grayscale mode, while also being able to offer full grayscale mode in other applications. Further, advantages of some example embodiments include an extended DC-restore mode providing a longer period of DC restore voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.