Patent ID: 8599111
Filing Date: 2013-12-03
Classification: G09G

Abstract:
1. A driving circuit of a display element having 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 an electric potential corresponding to a constant current to be supplied to the display element, and a control circuit including a second transistor connected in series to the current source circuit and connected in parallel to the display element and the capacitor element whose one terminal is connected to a gate of the second transistor and the other terminal is connected to a line, and controlling the light emission time of the display element by controlling the second transistor during the third period, wherein a constant voltage is applied from the line during the first period, wherein the gray-scale voltage is applied from the line during the second period, and moreover, the gate of the second transistor and the one terminal are short-circuited, and an electric charge based on the difference between the gray-scale voltage and the gate voltage of the second transistor is accumulated in the capacitor element, and wherein a sweep voltage is applied during the third period, so that the ON time of the second transistor is controlled.