Active pixel sensor with photo diode discharge

A pixel cell (30,40) and an active pixel sensor (20) that incorporates that pixel cell. Various embodiments of discharge circuitry (36,44) are disclosed and these embodiments achieve a discharging of the photo diode (31,41) of each pixel cell. In one embodiment, a discharge transistor (36) in couple...

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Bibliographische Detailangaben
Hauptverfasser:	LEWISON, RICHARD S, SINGH, KALWANT
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ADVERTISING ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION BASIC ELECTRIC ELEMENTS CRYPTOGRAPHY DISPLAY EDUCATION ELECTRIC COMMUNICATION TECHNIQUE ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR ELECTRICITY PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION SEALS SEMICONDUCTOR DEVICES
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Beschreibung
Zusammenfassung:	A pixel cell (30,40) and an active pixel sensor (20) that incorporates that pixel cell. Various embodiments of discharge circuitry (36,44) are disclosed and these embodiments achieve a discharging of the photo diode (31,41) of each pixel cell. In one embodiment, a discharge transistor (36) in coupled to the output node of the photo diode to achieve selectable discharge. In another embodiment, the voltage supply to the photo diode may be switchable coupled between a high level and a low level reference voltage.