Apparatus for selectively backlighting a material
US8128249B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 2007 |
| Grant date | Mar 6, 2012 |
| Priority date | — |
| Expiry date | May 3, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2219/052
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A backlighting device (300, 400, 500, 600) emitting light having a first wavelength includes a first radiation emission device (302), e.g., an electroluminescent lamp, for emitting radiation having a second wavelength. A layer (306) of a plurality of photon emitting particles (308), e.g., free standing quantum dots or phosphorus particles, emits light having the first wavelength in response to the first radiation emission device (302), the first wavelength being larger than the second wavelength. A transparent material (116, 120, 122) overlies the layer of a plurality of photon emitting particles (308), wherein the light having a first wavelength passes through the transparent material (116, 120, 122). Optionally, a filter (402) may be placed over the layer (306) to block the radiation having a second wavelength, and a scattering layer (604) may be placed over the layer (306) to scatter wavelength other than the first wavelength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.