Patent ID: 7791569

Claim:
A light emitting element circuit comprising: a current mirror circuit which includes two thin film transistors, two current input terminals, and two output terminals; a capacitor for holding voltage in accordance with an electric current to be input from one of the two current input terminals; a light emitting element connected to the current mirror circuit, wherein an electric current is supplied to the light emitting element through the current mirror circuit in accordance with the voltage held in the capacitor, and wherein the two output terminals of the current mirror circuit are connected to the light emitting element, and the two current input terminals of the current mirror circuit are connected with each other through a switch in a time period other than a time period during which an electric current is input from the one of the two current input terminals, and a switching circuit to connect the current mirror circuit to a matrix wiring, wherein the current mirror circuit includes a ground switch to connect the two output terminals of the current mirror circuit to a ground.