Illumination source having programmable rise and fall times
US7991281B1 · kind B1 · utility
5Cited by
1References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 19, 2010 |
| Grant date | Aug 2, 2011 |
| Priority date | — |
| Expiry date | Mar 19, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/40
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An illumination source senses a level of ambient light and determines an illumination waveform to be used to illuminate at least a portion of a document. The rise and the fall time of the illumination waveform are independently controlled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.