Automatic brightness control system and method for a display device using a logarithmic sensor
US6762741B2 · kind B2 · utility
400Cited by
8References
63Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 22, 2000 |
| Grant date | Jul 13, 2004 |
| Priority date | — |
| Expiry date | Apr 23, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2360/144
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
This invention provides an automatic brightness control system for display devices, which may have a lighted display, a sensor, and control circuitry. The sensor logarithmically generates a first signal in response to the ambient light near the lighted display. The control circuit selects a display luminance from one or more luminance adjustment sequences having essentially constant ratio steps. The display luminance is a fractional power function of the ambient light near the display. The fractional power function may be adjusted by a constant luminance ratio offset.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.