A first capacitor obtains a gate-source voltage of a first transistor in accordance with a programming current flowing through the first transistor, and a second capacitor obtains a threshold voltage of a second transistor. Then, the electric charges held in the first capacitor and the second capacitor are capacitively coupled. By using the voltage obtained with the capacitively coupling as a gate-source voltage of the first transistor, constant current in accordance with the programming current can be supplied to a light emitting element.