| CPC H04N 25/77 (2023.01) [H04N 25/78 (2023.01)] | 20 Claims |
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1. An image sensor comprising:
a first pixel configured to operate in a high conversion gain (HCG) mode and a low conversion gain (LCG) mode and output a first pixel signal to a column line, the first pixel including a first transfer transistor, a first floating diffusion node, and a first gain control transistor;
a second pixel configured to output a second pixel signal to the column line, the second pixel including a second transfer transistor and a second floating diffusion node;
a ramp signal generator configured to generate a ramp signal having a level changing with a certain slope; and
a comparator configured to compare each of the first and second pixel signals output through the column line with the ramp signal,
wherein the first pixel is further configured to operate in the HCG mode to output the first pixel signal as a first HCG pixel signal in a first period and operate in the LCG mode to output the second pixel signal as a first LCG pixel signal in a second period, and a reset level of the second floating diffusion node of the second pixel is provided to the comparator through the column line in an interim reset period between the first period and the second period.
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