IMAGE SENSOR
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United States of America Patent
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Issued Date -
May 7, 2015
app pub date -
Mar 13, 2014
filing date -
Nov 1, 2013
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An image sensor includes a passive pixel sensor array and a readout circuit. The passive pixel sensor array has a plurality of pixel columns each having at least one column line. The readout circuit includes a ramp signal generating circuit, a ramp signal line and a comparing circuit. The ramp signal generating circuit is arranged for generating a ramp signal. The ramp signal line is arranged for receiving the ramp signal, wherein the ramp signal line intersects the column line without electrical connection so as to form a parasitic capacitor. The comparing circuit corresponds to the column lines, wherein during the operating cycle of the readout circuit, a pixel sensor of the passive pixel sensor array outputs a charge signal to the column line, and the comparing circuit is arranged for generating an output signal of the pixel sensor according to the ramp signal and the charge signal.
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