White light source using two colored LEDs and phosphor
US8434924B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 2011 |
| Grant date | May 7, 2013 |
| Priority date | — |
| Expiry date | May 22, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0048
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A backlight for providing light to a computer-controlled display device, includes a plurality of first light sources, a plurality of second light sources, and a light guide panel (LGP). The LGP has at least one edge and a surface facing a display surface of the display device and is adapted for guiding light emitted by, and received from, the first and second light sources at one or more edges of the LGP to the surface of the LGP. The first light sources include first light emitting diodes (LEDs) having a peak emission wavelength of greater than 500 nm. The second light sources include second LEDs having a peak emission wavelength of less than 480 nm and phosphor material that absorbs a portion of light emitted from the second LEDs and converts the absorbed light into light emitted from the phosphor material having a peak emission wavelength greater than 500 nm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.