Image sensor having unit light receiving circuit with sample-and-hold means
US6429413B1 · kind B1 · utility
12Cited by
2References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 20, 1999 |
| Grant date | Aug 6, 2002 |
| Priority date | — |
| Expiry date | Oct 20, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/626
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
To eliminate a residual image due to residual charge in an image sensor circuit and provide an effective bright-time output, the image sensor is provided with a reset switch connected to a photodiode. After the potential of the photodiode is held through a first amplifier in two holding circuits as an image signal and an initial signal, the initial signal and the image signal are sequentially output through a second amplifier. By resetting the photodiode to a desired potential to produce an initial signal, a residual image can be eliminated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.