Snapshot CMOS image sensor with high shutter rejection ratio
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United States of America Patent
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Aug 7, 2007
Grant Date -
Nov 30, 2006
app pub date -
May 27, 2005
filing date -
May 27, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A pixel image sensor has an isolation barrier and diffusion well connected to a biasing voltage to prevent substrate charge leakage caused by photoelectrons generated in the substrate beneath a photon sensing area of the pixel image sensor from drifting to a storage node. An opaque metallic silicide layer is deposited on and a metal shield is fabricated above the storage node and storage node control transistor switches to prevent light from impinging on the storage node and storage node control transistor switches and thus preventing generation of photoelectrons at the storage node and storage node control transistor switches. A guard ring surrounds the photo sensing area, the storage node, and the storage node control transistor switches and is in contact with the biasing voltage and reduces cross-talk from photoelectrons drifting from adjacent image sensors.
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