Ambient infrared detection in solid state sensors
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United States of America Patent
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Jun 15, 2010
Grant Date -
Mar 6, 2008
app pub date -
Aug 31, 2006
filing date -
Aug 31, 2006
priority date (Note) -
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Abstract
A solid state imaging device includes an array of active pixels and an infrared cut filter formed over the sensor. Optionally, a slot in the infrared cut filter allows infrared illumination to reach the sensor to be detected by pixels covered by a visually opaque filter and surrounded by pixels of special types that limit charge leakage and enable high dynamic range sensing of infrared illumination. A ratio of average infrared signal to average brightness indicates an amount of infrared illumination reaching the imaging device.
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