Lighting device
US6611000B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 2002 |
| Grant date | Aug 26, 2003 |
| Priority date | — |
| Expiry date | Mar 12, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/0002
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lighting device includes: a plurality of LEDs arranged in an at least two-dimensionally dispersed manner; a transparent resin layer that covers the plurality of LEDs in an integrated form; a photo-detecting unit that detects an intensity of light emitted from the plurality of LEDs using a photodetector, the photodetector being arranged inside, on a surface, or in the vicinity of the transparent resin layer; and a power supply circuit unit that controls driving of the plurality of LEDs based on a detection output from the photo-detecting unit. Here, the number of the photodetector is smaller than the number of the LEDs, and the photodetector detects an intensity of light emitted from the LEDs and propagated through the transparent resin layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.