Semiconductor device, method for driving semiconductor device, and electronic device

A semiconductor device comprising a light-emitting unit and an imaging unit,

• wherein the imaging unit comprises first to m-th latch circuits (m is an integer greater than or equal to 2) and first to m-th register circuits,
• wherein a first start pulse signal is input to the first latch circuit,
• wherein a second start pulse signal is input to the first to m-th latch circuits,
• wherein scan signals output from the first to (m−1)-th register circuits are input to the second to m-th latch circuits respectively,
• wherein the first latch circuit is configured to output one of the first start pulse signal and the second start pulse signal to the first register circuit on the basis of data held in the first latch circuit, and
• wherein the second to m-th latch circuits are configured to output one of the scan signal and the second start pulse signal to the second to m-th register circuits, respectively, on the basis of data held in the second to m-th latch circuits.

A method for driving a semiconductor device comprising a light-emitting unit and an imaging unit,

• wherein the imaging unit comprises a shift register circuit in which first to m-th latch circuits (m is an integer greater than or equal to 2) and first to m-th register circuits are connected in series alternately, comprising:
• inputting a first start pulse signal to the first register circuit via the first latch circuit in a first period;
• outputting a first scan signal from the first register circuit and sequentially transferring the first scan signal to the second to m-th register circuits via the second to m-th latch circuits in a second period;
• writing data in a p-th latch circuit (p is any of integers greater than or equal to 1 and less than m) after inputting the first start pulse signal to the first latch circuit in a third period;
• inputting the second start pulse signal to a p-th register circuit via the p-th latch circuit in a fourth period;
• outputting a second scan signal from the p-th register circuit and transferring the second scan signal to a (p+1)-th register circuit via a (p+1)-th latch circuit in a fifth period;
• and
• wherein a transmission rate of the first scan signal is higher than a transmission rate of the second scan signal.