CMOS image sensor with wide dynamic range
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United States of America Patent
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Mar 10, 2015
Grant Date -
Sep 6, 2012
app pub date -
May 14, 2012
filing date -
Dec 29, 2005
priority date (Note) -
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Abstract
The present invention relates a CMOS (Complementary Metal Oxide Semiconductor) image sensor capable of improving dynamic range by using an additional driver transistor. The CMOS image sensor according to the present invention has a pixel array which has a plurality of unit pixels each of which includes a photodiode and a fist transistor to act as a source follower buffer amplifier to amplify photogenerated charges accumulated in the photodiode. Also, the CMOS image sensor includes a second transistor for a buffer amplifier to amplify and output a gate input voltage in the unit pixel, wherein an output signal of the first transistor is applied to a gate of the second.
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