Lighting unit with temperature compensation
US8174041B2 · kind B2 · utility
0Cited by
4References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 27, 2009 |
| Grant date | May 8, 2012 |
| Priority date | — |
| Expiry date | Apr 8, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/8506
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lighting unit comprises a packaging substrate (10) formed from a semiconductor, a channel (12) formed in the substrate and a discrete light emitting diode arrangement (34) in the channel. A surface region of the channel comprises doped semiconductor layers (20, 24) which define a light sensor. The arrangement provides a light sensor (which can be used to determine colour and/or output flux) for a LED unit, with the light sensor embedded in substrate used for packaging. This provides a low cost integration process and provides good registration between the light sensor and the LED output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.