Ambient luminosity level detection
US9927291B2 · kind B2 · utility
5Cited by
2References
36Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 2, 2015 |
| Grant date | Mar 27, 2018 |
| Priority date | — |
| Expiry date | Jan 29, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/00917
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The following steps are performed in connection with a photodiode circuit: a) resetting the photodiode circuit; b) determining when a photodiode voltage changes in response to illumination to reach a threshold; and c) updating a counter in response to the determination in step b). The steps a) to c) are repeated until an end of a measurement period is reached. The value of the counter at the end of the measurement period is then output to indicate an intensity of the illumination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.