Image sensor architecture with power saving readout
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United States of America Patent
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Dec 13, 2016
Grant Date -
Dec 24, 2015
app pub date -
Jun 2, 2015
filing date -
Jun 19, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
Pixels within an image sensor pixel array are sampled by corresponding conditional read circuitry. A zero pixel value is outputted for each pixel associated with a sample less than a conversion threshold, and a saturated pixel value is outputted for each pixel associated with a sample greater than or equal to a saturation threshold. Samples greater than or equal to the conversion threshold and less than the saturation threshold are converted by an ADC, and a converted pixel value is output for each associated above threshold pixel. The ADC (along with any corresponding amplifiers) are powered on for a variable period depending on the number of pixels needing conversion during the conversion of such samples during a read period, and are powered off for the remainder of the read period.
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