| abstract |
To reduce power consumption, included are a selection signal output circuit, a reset signal output circuit, and a photodetector circuit. The selection signal output circuit is for outputting a selection signal. The reset signal output circuit is for outputting a reset signal. The photodetector circuit is supplied with the reset signal and the selection signal, is brought into a reset state in accordance with the input reset signal, generates a voltage corresponding to the illuminance of incident light when light enters the photodetector circuit, and outputs the generated voltage as a data signal in accordance with the input selection signal. In a first period, the reset signal output circuit and the selection signal output circuit output the reset signal and the selection signal, respectively. In a second period, stopped are output of the reset signal from the reset signal output circuit and output of the selection signal from the selection signal output circuit. |