Method of controlling backlight device and display apparatus using the same
US8947470B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 2011 |
| Grant date | Feb 3, 2015 |
| Priority date | — |
| Expiry date | Mar 4, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2360/16
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a display apparatus, a display panel is divided into dimming areas and a backlight device includes light source blocks providing light to the dimming areas. Average gray-scale values and maximum gray-scale values respectively corresponding to the dimming areas are generated based on image signals provided to the dimming areas. Whether the average gray-scale values and the maximum gray-scale values are respectively within first and second reference ranges are checked. One of at least two parameters is selected according to a checked result, and representative brightness values respectively corresponding to the dimming areas are determined using the selected parameter. Duty ratios of the light source blocks are controlled based on the representative brightness values. As a result, power consumption is reduced when applying a dimming device to the display apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.