Light Emitting Diode planar light source with blue light or ultraviolet ray-emitting luminescent crystal with optional UV filter
US5982092A · kind A · utility
61Cited by
7References
5Claims
0Family size
Inventor
Key dates
| Filing date | Oct 6, 1997 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Oct 6, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0051
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
LED planar light source which introduces blue light or ultra violet rays emitted from luminescent crystals to a light conductive plate from its side surface. After being scattered and diffused by the light conductive plate and reflected from a reflection layer, the incident light and the excited light from a fluorescent pigment layer are mixed and synthesized to form white light or light of another specific wave length. Such a planar light source can be utilized as a back light source for a LCD.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.