Solid-state image sensing apparatus having an automatic control loop
US4678938A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 5, 1985 |
| Grant date | Jul 7, 1987 |
| Priority date | — |
| Expiry date | Sep 5, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/63
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A solid-state image sensing apparatus employs normally-ON type static induction transistors to constitute picture elements. Some of the picture elements are shielded from light so as to serve as light-shielded picture elements. The apparatus is provided with an automatic control loop which controls the voltage level of each of the row selecting signals in accordance with the output of the corresponding light-shielded picture element, whereby the voltage level of each row selecting signal is automatically controlled in such a manner that the output of the corresponding light-shielded picture element becomes zero. Thus, it is possible to obtain a video output which includes no offset nor dark output without decreasing the dynamic range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.