Patent ID: 8243055

Claim:
A light-emitting display device comprising multiple pixels, the pixels each including: a light-emitting element which has an anode terminal and a cathode terminal and emits light at a luminance determined based on a current to be supplied; and a drive circuit for supplying the current to the light-emitting element based on a control voltage supplied from a data line, the drive circuit including: a driving transistor having a gate terminal, a source terminal, and a drain terminal, for driving the light-emitting element; a capacitor element having a first end connected with the gate terminal of the driving transistor and a second end; a first switch element for electrically connecting or disconnecting the gate terminal and the source terminal of the driving transistor; a second switch element for electrically connecting or disconnecting the source terminal of the driving transistor and the second end of the capacitor element; and a third switch element for electrically connecting or disconnecting the data line and the second end of the capacitor element, wherein in a light-emitting period, the second end of the capacitor element is connected with the source terminal by the second switch element and the drive circuit supplies a current to the light-emitting element; and in a current setting period prior to the light-emitting period, during which the gate terminal is connected with the source terminal by the first switch element and the second end of the capacitor element is connected with the data line by the third switch element, the source terminal of the driving transistor is once connected with a reference voltage line having a voltage higher than a voltage of the drain terminal, and thereafter the source terminal of the driving transistor is disconnected from the reference voltage line to render the voltage between the gate terminal and the drain terminal equal to a threshold voltage of the driving transistor.