Fail-safe illuminated display comprising multimodal illumination components
US6364498B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1999 |
| Grant date | Apr 2, 2002 |
| Priority date | — |
| Expiry date | Dec 22, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B7/062
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An illuminated display that is susceptible to interruption or termination of active lighting capability and provides passive lighting capability in such circumstances. The illuminated display features an active illumination source providing active lighting capability and a display member (i) arranged in light-receiving relationship to the active illumination source and (ii) containing photoluminescent pigment incorporated therein in sufficient amount and distribution to illuminate the display during the interruption or termination of active lighting capability, to provide passive lighting capability. The illuminated display may further include a fluorescent pigment arranged in photoluminescent light-receiving relationship to the display member containing the photoluminescent pigment, whereby the fluorescent pigment down-converts photoluminescent light from the display member during the interruption or termination of active lighting capability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.