Method and apparatus for setting gamma correction voltages for LCD source drivers
US7554517B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 2005 |
| Grant date | Jun 30, 2009 |
| Priority date | — |
| Expiry date | May 1, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A gamma reference voltage generator (10B) for an LCD display includes a control interface logic circuit (48) having an output bus coupled to inputs of a first register (46) having outputs coupled to inputs of a second register (42) the outputs of which are coupled to corresponding inputs of plurality of DACs (28). The control interface logic circuit receives gray scale codes representative of gamma reference voltages and transfers the codes via the output bus into the first register and controls further transfer of the codes to inputs of the DACs to instantaneously or rapidly update gamma correction voltages applied to the LCD display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.