Light emitting sign and display surface therefor
US8631598B2 · kind B2 · utility
235Cited by
13References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 6, 2011 |
| Grant date | Jan 21, 2014 |
| Priority date | — |
| Expiry date | May 6, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F13/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A light emitting sign comprising a plurality of blue LEDs operable to generate blue excitation light and a light emitting display surface comprising a light transmissive substrate and at least one phosphor overlaying at least a portion of one face of the substrate. The phosphor is configured to absorb at least a portion of the blue light generated by the LEDs and, in response, to emit light of a selected color other than blue. Regions of the display surface intended to generate blue light do not include the phosphor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.