LED array with photodetector
US8264431B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 2003 |
| Grant date | Sep 11, 2012 |
| Priority date | — |
| Expiry date | Mar 29, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2360/145
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Embodiments of the present invention provide for an array, and corresponding method of forming an array, that includes a plurality of light emitting devices. The light emitting devices are disposed over a substrate, and a photodetector detects light emitted through the substrate from the light emitting devices. Further, a substantially constant brightness may be maintained in a plurality of light emitting devices disposed over the upper surface of a substrate in an array. Light emitted through the substrate from each of the light emitting devices is measured, and the voltage level applied to each of the light emitting devices is varied to maintain a substantially constant brightness level of light emitted from the light emitting devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.