| CPC H04N 25/77 (2023.01) [H04N 25/63 (2023.01); H04N 25/65 (2023.01)] | 5 Claims |
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1. An image sensor comprising:
a plurality of pixels, wherein each pixel of the plurality of pixels includes:
a photodiode configured to operate both in a linear mode in which the photodiode shows a linear response to a light incident amount and in a photovoltaic mode in which the photodiode shows a logarithmic response to the light incident amount,
a pixel source follower transistor configured to output a signal voltage corresponding to a signal generated based on an output of the photodiode,
a pixel switch transistor configured to turn on/off an output of the pixel source follower transistor,
a holding capacitor connected to an output end of the switch transistor and configured to hold a voltage corresponding to the output of the photodiode, and
an output source follower circuit configured to output a voltage held by the holding capacitor as a signal voltage;
an AD converter, wherein the AD converter converts the signal voltage output from the output source follower circuit of each pixel of the plurality of pixels into digital signal data;
a frame memory, wherein the frame memory stores the digital signal data of one frame period;
a conversion function block, wherein the conversion function block generates an optical signal relating to the light incident amount from digital signal data of a current frame and digital signal data of a previous frame, wherein the pixel switch transistors of the plurality of pixels of the whole image sensor are turned on at a same timing, and hold the signal voltages in the holding capacitors.
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