Stacked rolling shutter and global shutter image sensor with knee self point calibration
US10250832B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 2, 2018 |
| Grant date | Apr 2, 2019 |
| Priority date | — |
| Expiry date | May 2, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/79
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image sensor has a stacked pixel arrangement including both rolling and global shutter readout circuits wherein each pixel includes an adjustable transfer transistor gate voltage level for modifying electric charge within a photodiode during exposure depending on incident light intensity. The sensor also has a row decoder circuit providing readout signals to each row of the imaging cells during both a readout interval and during a calibration interval for each row. The row decoder may employ one of several of its features to provide a self-knee point calibration following an image signal readout in order to minimize photo conversion variations that lead to fixed pattern noise and to enhance dynamic range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.