System and method for calibrating backlight devices
US8508155B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 6, 2011 |
| Grant date | Aug 13, 2013 |
| Priority date | — |
| Expiry date | Dec 8, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2360/144
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A system and method for controlling the backlight of a liquid crystal display (LCD) to account for ambient light penetration through the LCD stack and into the backlight cavity. A first light sensing device may be placed to measure the ambient light while a second light sensing device may be placed within the backlight cavity to measure the backlight luminance. A desired display luminance (based on the ambient light) can be converted to a desired backlight luminance. A software driver or microprocessor may drive the LCD backlight to meet the desired backlight luminance. A calibration can be performed to create and store correction factors for the second light sensing device when high ambient light levels create disruptions in the data for the second light sensing device. The correction factors may be used to accurately control the backlight levels and may be based upon incoming data from the first light sensing device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.