Solid-state imaging device which sets a black level reference when capturing an image
US8872948B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 2012 |
| Grant date | Oct 28, 2014 |
| Priority date | — |
| Expiry date | Feb 12, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/78
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
According to one embodiment, a solid-state imaging device includes an effective pixel portion in which effective pixels are provided, a light-shielded pixel portion in which light-shielded pixels are provided, an ADC circuit that performs an AD conversion operation for signal components read from the effective pixel and the light-shielded pixel, on the basis of a result of a comparison with a reference voltage on which a clamping voltage is superimposed, and an AD clamping circuit that calculates a clamping voltage for a target value of a black level read from the light-shielded pixel by extrapolating a relation between the clamping voltage and an AD-converted value of the black level read from the light-shielded pixel at the time when the clamping voltage is applied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.