Image sensor and pixel that has positive transfer gate voltage during integration period
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United States of America Patent
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Jun 7, 2011
Grant Date -
Nov 18, 2010
app pub date -
Jul 26, 2010
filing date -
Oct 15, 2004
priority date (Note) -
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Abstract
A pixel and image sensor formed in accordance with the present invention has two modes of operation: a normal mode and a low light mode. The present invention switches from a normal to a low light mode based upon the amount of illumination on the image sensor. Once the level of illumination is determined, a decision is made by comparing the level of illumination to a threshold whether to operate in normal mode or low light mode. In low light mode, the reset transistor (for a 3T pixel) or the transfer transistor (for a 4T pixel) is biased positive.
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