Patent ID: 8629817

Claim:
A driving circuit of a display element for performing a driving control including a first period for setting a current to be supplied to the display element, a second period for setting a gray-scale of the display element, and a third period for supplying a driving current to the display element, comprising: a current source circuit having a first transistor and a holding circuit for holding a gate voltage of the first transistor during the first period at the voltage corresponding to a constant current to be supplied to the display element; and a control circuit including a second transistor connected in series between the current source circuit and the display element, a third transistor whose one terminal is connected to a gate of the second transistor, and a capacitor element whose one end is connected to a gate of the third transistor and the other end is connected to a line, and controlling a light emission time of the display element by controlling the second transistor during the third period, wherein, during the second period, the gate and the one terminal of the third transistor are short-circuited to set a gate voltage of the third transistor to a threshold value voltage of the third transistor and a gray-scale voltage is supplied from the line to the other end of the capacitor, whereby an electric charge is stored in the capacitor element based on the difference between the gray-scale voltage supplied to the capacitor element from the line and a threshold voltage of the third transistor, and wherein, during the third period, a sweep voltage is applied from the line to the other end of the capacitor element, so that the ON time of the second transistor is controlled.