Image sensor

An image sensor comprising a pixel array in which a plurality of pixels are arranged,

• wherein the pixel array comprises:
• unit pixels each including a plurality of sub-pixels;
• and
• one or more auto focusing (AF) pixels including a first sub-pixel group and a second sub-pixel group of the plurality of sub-pixels,
• wherein one microlens is disposed above each of the one or more AF pixels,
• wherein first photodiodes corresponding to the first sub-pixel group included in the one or more AF pixels are electrically connected to a transfer circuit included in the one or more AF pixels,
• wherein the transfer circuit comprises an overflow capacitor for storing overflow charges of the photodiodes corresponding to the first sub-pixel group, and
• wherein a first region and a second region respectively correspond to a first side of the microlens and a second side of the microlens.

An image sensor comprising a pixel array including one or more auto focusing (AF) pixels,

• wherein a microlens is disposed on the AF pixel,
• wherein the AF pixel comprises:
• a plurality of photodiodes corresponding to a plurality of sub-pixels included in the AF pixel;
• a plurality of transfer transistors configured to transfer photocharges of the plurality of photodiodes to a transfer circuit;
• and
• the transfer circuit including a plurality of overflow capacitors for storing overflow charges of the plurality of photodiodes,
• wherein first overflow charges of a photodiode included in a region corresponding to a first region of the microlens are stored in a first overflow capacitor of the plurality of overflow capacitors,
• wherein second overflow charges of a photodiode included in a region corresponding to a second region of the microlens stored in a second overflow capacitor of the plurality of overflow capacitors, and
• wherein the first overflow charges and the second overflow charges are processed independently of each other.