Photodetection apparatus and electronic device

An electronic device including a photodetection apparatus comprising:

• a pixel array unit in which pixel circuits each including a photon detection unit that generates a pulse signal in response to incidence of photons and a counter that counts the pulse signal generated by the photon detection unit are arranged in a matrix form, and the pixel circuits constitute a pixel unit with N stages (N is an integer) as one unit for each pixel column;
• a holding array unit that is provided outside the pixel array unit and holds a count value of the counter read from the pixel unit;
• and
• a control unit that performs a shift operation of writing a count value of the counter in a preceding stage to the counter in a next stage before exposure of a next line is started in the pixel unit and reads a count value of the counter for each pixel unit in units of M (M is an integer) pixel units from the pixel array unit to the holding array unit,
• wherein
• the holding array unit includes:
• (M-1) holding units each of which is provided corresponding to a pixel column of the pixel array unit and includes a holding unit at N stages that holds a count value of the counter read from one pixel unit of the M pixel units;
• and
• (M-1) addition circuits that add a held value of a holding unit at a final stage in the holding unit at the N stages and a count value of the counter read from a pixel unit at a next stage of the one pixel unit.