Patent ID: 8207487
Filing Date: 2012-06-26
Classification: G01J,H01L

Abstract:
1. A photoelectric conversion device comprising: a photoelectric conversion circuit for generating a first current in accordance with illuminance of incident light; a charge/discharge circuit, wherein the charge/discharge circuit comprises a first capacitor comprising a first terminal and a second terminal, a second capacitor comprising a first terminal and a second terminal, and a third switching element configured to control conduction between the first terminal of the first capacitor and the first terminal of the second capacitor in accordance with the first current; a first switching element configured to control conduction between the photoelectric conversion circuit and the charge/discharge circuit; a current circuit for generating a second current; a second switching element configured to control conduction between the charge/discharge circuit and the current circuit; a comparator for comparing a reference potential and an output potential of the charge/discharge circuit; and a comparison circuit which compares a second reference potential with a potential of a connection portion between the second input terminal of the comparator and the charge/discharge circuit and which outputs a control signal for controlling on/off of the third switching element based on a result of the comparison.