Pixel Circuit, depth sensor having dual operating mode for high and low incident light and operating method
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United States of America Patent
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Sep 16, 2014
Grant Date -
May 23, 2013
app pub date -
Sep 12, 2012
filing date -
Nov 17, 2011
priority date (Note) -
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Abstract
A pixel circuit for a depth sensor operating in a detection period and an output period in either a first operating mode (high incident light intensity) or a second operating mode (low incident light intensity). The pixel circuit includes a light receiving unit generating charge in response to the incident light, a signal generation unit accumulating charge in a FDN in response to a transmission signal, reset signal and selection signal during the detection period, and generating an analog signal having a level corresponding to a voltage apparent at the FDN during the output period, and a refresh transistor coupled between a supply voltage and the light receiving unit and discharging charge to the supply voltage in response to a refresh signal.
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