Conversion gain modulation using charge sharing pixel
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United States of America Patent
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Sep 30, 2014
Grant Date -
Jan 24, 2013
app pub date -
Dec 21, 2011
filing date -
Jan 2, 2011
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Abstract
An image sensor including an array of pixel elements is operated according to two operation modes to modulate the conversion gain of the pixel to operate the image sensor based on the impinging light conditions. More specifically, an image sensor pixel element is operated in a high conversion gain mode for low light conditions and in a low conversion gain mode for bright light conditions. The low conversion gain mode implements charge sharing between the floating diffusion and the photodiode. The low conversion gain mode further implements partial reset where the photodiode and the floating diffusion are reset to the same potential and to a potential slightly less than the pinning voltage of the photodiode.
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