Imaging system, pixel array of imaging system and image sensor

An imaging system, comprising:

• a light emitting unit, configured to send a structured light signal;
• and
• at least one pixel array, wherein each pixel array comprises a plurality of pixels arranged in rows and columns, the pixels configured to sense a reflected signal, the reflected signal being incident on the pixel array by the structured light signal to form a plurality of reflected light spots separated from each other on the pixel array, wherein each of the pixels comprises:
• a photodetector, configured to detect the reflected signal and accordingly output a photo response signal;
• and
• a readout circuit, coupled to the photodetector, the readout circuit being configured to transfer the photo response signal to a floating diffusion node, and generate a pixel output at least according to a signal at the floating diffusion node, wherein the readout circuit comprises a transfer transistor configured to selectively couple the photo response signal to the floating diffusion node;
• wherein respective photodetectors of a group of pixels of the pixels disposed along a first predetermined direction are arranged in a staggered manner in the first predetermined direction;
• the group of pixels comprise a first pixel and a second pixel adjacent to the first pixel in the first predetermined direction;
• as viewed from top of the pixel array, a gate of the transfer transistor in the readout circuit of the first pixel is spaced apart from a photosensitive area of the photodetector of the first pixel, and is spaced apart from a photosensitive area of the photodetector of the second pixel;
• as viewed from the top of the pixel array, each of the photodetector of the first pixel and the readout circuit of the first pixel is adjacent to and faces the photodetector of the second pixel, spaced apart from the readout circuit of the first pixel, along the first predetermined direction, and the readout circuit of the first pixel is adjacent to the photodetector of the first pixel along a second predetermined direction perpendicular to the first predetermined direction.