Apparatus and method for adaptively adjusting backlight
US8120569B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 2007 |
| Grant date | Feb 21, 2012 |
| Priority date | — |
| Expiry date | Dec 20, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2360/16
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for adaptively adjusting backlight are described. The backlight adjusting apparatus includes an intensity-pair distribution device, a brightness compensation module, a frame-adjusting device, a backlight control device, and a backlight module. The intensity-pair distribution device generates a plurality of intensity-pair distribution values of the image frames each composed of a plurality of pixel data. The brightness compensation module computes a dark-state ratio of the pixel data of a current image frame in response to the intensity-pair distribution values, and computes a brightness index of the current image frame in response to the dark-state ratio for generating a brightness compensating signal based on the dark-state ratio and the brightness index. The frame adjusting device adjusts the brightness of the total pixel data of the current image frame in response to brightness compensating signal. The backlight control device updates the brightness index of the current image frame in response to the brightness index of a previous image frame and the intensity-pair distribution values of the current image frame for generating a backlight control signal of…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.