Light-emitting device and illumination apparatus
US10278245B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 29, 2016 |
| Grant date | Apr 30, 2019 |
| Priority date | — |
| Expiry date | Nov 12, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/181
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light-emitting device includes a substrate and a plurality of light-emitting elements disposed above the substrate. In the plurality of light-emitting elements, a first light-emitting element and a second light-emitting element different in a rate of decrease in light output along with a temperature increase are included. The plurality of light-emitting elements include: a first serial element group including some light-emitting elements connected in series among the plurality of light-emitting elements; and a second serial element group connected in parallel with the first serial element group and including some light-emitting elements connected in series among the plurality of light-emitting elements. A ratio between a total number of first light-emitting elements and a total number of second light-emitting elements is different between the first serial element group and the second serial element group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.