Circuitry and method for reducing power consumption in gamma correction circuitry
US8610658B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 19, 2008 |
| Grant date | Dec 17, 2013 |
| Priority date | — |
| Expiry date | Sep 13, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2330/021
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Gamma curve correction circuitry includes first (24-1,2 . . . 11) and second (24-12,13 . . . 22) groups of gamma correction buffers and corresponding DACs (28-1,2 . . . 22). Each buffer has an input coupled to an output of a corresponding DAC, respectively, and an output coupled by a corresponding output conductor, respectively, to a corresponding resistor string tap point. A midrange voltage (V30) is produced with a value approximately midway between a first voltage (VDD) and a second voltage (GND) and is coupled to provide power to the first and second groups of buffers. The first voltage is coupled to a first voltage terminal of a first buffer (24-11) of the first group. A second voltage terminal of the first buffer is coupled to the midrange voltage. The midrange voltage is coupled to a first voltage terminal of a first buffer (24-12) of the second group. A second voltage terminal of the first buffer of the second group is coupled to the second voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.