Light emitting device, and lighting system, backlight for display and display using the same
US7474050B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 2005 |
| Grant date | Jan 6, 2009 |
| Priority date | — |
| Expiry date | Jun 29, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/856
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light emitting device for enhancing emission efficiency and color rendering, comprising: a light source; a first emitting section having a luminescent material emitting light including a wavelength component longer than that of light from the light source when excited by the light from the light source; a second emitting section having a luminescent material emitting light including a wavelength component longer than that of the light from the first emitting section when excited by the lights from the light source and the first emitting section; and a light exit side from which the light from the light source, the first light-emitting section and the second light-emitting section emerges outside; and the first emitting section and the second emitting section are opened at the light exit side, and an area of a boundary surface between the first emitting section and the second emitting section is equal to or less than fifty percent of the surface area of the first emitting section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.