Backlight unit implementing local dimming for liquid crystal display device
US8104945B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 8, 2008 |
| Grant date | Jan 31, 2012 |
| Priority date | — |
| Expiry date | Dec 13, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133603
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A backlight unit for a liquid crystal display (LCD) device, disposed under a liquid crystal panel to illuminate the liquid crystal panel. The backlight unit includes a light guide plate, first and second light emitting diode (LED) arrays, disposed on adjacent sides, perpendicular to each other, of the light guide plate, each array having a plurality of LED blocks, consisting of one or more LEDs, and a control unit that controls electric signals, respectively inputted to the LED blocks, to regulate luminance for the respective LED blocks, wherein light emitted from the first and second LED arrays is overlapped each other in the light guide plate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.