Methods and apparatus for providing a luminous writing surface
US7543951B2 · kind B2 · utility
10Cited by
40References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 30, 2007 |
| Grant date | Jun 9, 2009 |
| Priority date | — |
| Expiry date | Oct 19, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/0283
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Disclosed herein are methods and apparatus for providing a luminous writing surface, whose color, color temperature, and/or brightness are controlled to achieve a desired contrast between the writing surface and markings removably made thereon. For example, LED-based light sources and/or LED-based controllable lighting units can be employed to back-light or edge-light a transparent or translucent material thereby providing the luminous writing surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.