Image sensor having wide dynamic range based on pixels with plurality of photoelectric conversion elements, operating method of the same and electronic device

Abstract

Disclosed is an image sensor. The image sensor includes a plurality of pixels, one of which includes: a driving transistor; a first switching transistor; a first photoelectric conversion element group with first photoelectric conversion elements; a second photoelectric conversion element group with at least one second photoelectric conversion element; a first floating diffusion region connected to the first photoelectric conversion elements through a first transfer transistor; a second floating diffusion region connected to the at least one second photoelectric conversion element through a second transfer transistor; a third floating diffusion region connected to a gate of the driving transistor, and separated from each of the first floating diffusion region and the second floating diffusion region by the first switching transistor; and a reset transistor with a first end to which a reset voltage is applied and a second end connected to the third floating diffusion region.