Light emitting sign and display surface therefor
US7937865B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2007 |
| Grant date | May 10, 2011 |
| Priority date | — |
| Expiry date | Oct 25, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F13/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A light emitting sign comprising a light emitting display surface including at least one phosphor, and at least one radiation source configured to irradiate the display surface with excitation energy such that the phosphor emits light of a selected color. The sign further comprises a filter which is substantially transparent to light emitted by the display surface, filtering other colors of light. The display surface may be configured into a shape of a character, a symbol, or a device. Alternatively, a mask having at least one window substantially transparent to the emitted light and/or at least one light blocking region may be provided in which the window and/or light blocking region define a character, a symbol, or a device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.