Solid state imaging device

A solid state imaging device comprising:

• a photodetecting section including M×N pixel portions P1,1 to PM,N two-dimensionally arrayed in M rows and N columns, each including a photodiode which generates charges as much as an incident light intensity and a readout switch connected to the photodiode;
• an m-th row selection wiring Lv,m which supplies an m-th row selecting control signal for instructing opening and closing operations of the readout switches included in N pixel portions Pm,1 to Pm,N of the m-th row in the photodetecting section to the readout switches;
• a readout wiring LO,n which is connected to readout switches included in the M pixel portions P1,n to PM,n of the n-th column in the photodetecting section, extends between a first end and a second end, and reads out charges generated in a photodiode included in any of the M pixel portions P1,n to PM,n via the readout switch included in the pixel portion;
• an integrating circuit Sn which has an input terminal connected to the first end of the readout wiring LO,n, includes an integrating capacitive element and a discharge switch, discharges the integrating capacitive element when the discharge switch is closed, and accumulates charges input in the input terminal in the integrating capacitive element when the discharge switch is open, and outputs a voltage value corresponding to the accumulated charge amount in the integrating capacitive element from an output terminal;
• a discharge wiring which supplies a discharging control signal for instructing opening and closing operations of the discharge switches included in the integrating circuits S1 to SN to the discharge switches;
• a holding circuit Hn which has an input terminal connected to the output terminal of the integrating circuit Sn, includes an input switch, a holding capacitive element, and an output switch, makes the holding capacitive element hold a voltage value input in the input terminal when the input switch switches from a closed state to an open state, and outputs a voltage value held in the holding capacitive element when the output switch is closed;
• a holding wiring which supplies a holding control signal for instructing opening and closing operations of the input switches included in the holding circuits H1 to HN to the input switches;
• an initialization switch SWI,n connected to the second end of the readout wiring LO,n;
• an initialization wiring which supplies an initializing control signal for instructing opening and closing operations of the initialization switches SWI,1 to SWI,N to the initialization switches SWI,1 to SWI,N;
• a voltage supply wiring which is connected to the readout wiring LO,n via the initialization switch SWI,n, and supplies a predetermined voltage value to the readout wiring LO,n;
• and
• a controlling section which outputs the m-th row selecting control signal to the m-th row selection wiring LV,m, outputs the discharging control signal to the discharge wiring, outputs the holding control signal to the holding wiring, and outputs the initializing control signal to the initialization wiring, provided that M and N are integers not less than 2, m is integers not less than 1 and not more than M, and n is integers not less than 1 and not more than N, wherein
• the controlling section
• instructs temporary closing and then opening of the discharge switches included in the integrating circuits S1 to SN by the discharging control signal, and then
• instructs closing of the readout switches included in N pixel portions Pm,1 to Pm,N of the m-th row in the photodetecting section for a first period by the m-th row selecting control signal, and
• in the first period, instructs switching of input switches included in the holding circuits H1 to HN from a closed state to an open state by the holding control signal, and then instructs closing of the initialization switches SWI,1 to SWI,N for a second period by the initializing control signal.