Light-emitting device comprising porous alumina, and corresponding method fabrication
US7267596B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 2006 |
| Grant date | Sep 11, 2007 |
| Priority date | — |
| Expiry date | Jun 19, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/872
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light-emitting device, in particular a backlight device, comprises a transparent substrate (2) having a front surface and a rear surface, in which associated to the rear surface are means for generating an electromagnetic radiation that is able to pass through the substrate and come out of the front surface. According to the invention, the device comprises a layer of porous alumina which operates so as to inhibit propagation of said electromagnetic radiation in the directions parallel to the plane of the substrate, thus improving the efficiency of extraction of light from the substrate and increasing the directionality of the emitted light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.