Patent ID: 8816944

Claim:
A driving current output apparatus comprising: a bias current outputting unit which outputs a bias current having a predetermined magnitude; a driving current outputting unit comprising a plurality of driving current outputting circuits, each of the plurality of driving current outputting circuits being sequentially connected to an output terminal of the bias current outputting unit through a single selecting switch which selects one of the driving current outputting circuits sequentially to be connected to the output terminal of the bias current outputting unit, a driving current outputting circuit of the plurality of driving current outputting circuits outputting a driving current based on the bias current to an input terminal of a switching element included in a pixel and connected to a light emitting element; and a pulse width modulation circuit which generates PWM signals having pulse widths defined by magnitudes of image data and outputs the PWM signals to a control terminal of the switching element to control turn-on and turn-off periods of the switching element, wherein the driving current outputting circuit comprising: a first transistor connected between a driving voltage and the bias current outputting unit; a first switch comprising an end connected directly to a gate of the first transistor; a second transistor comprising a gate connected directly to another end of the first switch, a drain connected to the driving voltage, and a source connected to the switching element; and a capacitor connected to the driving voltage and the gate of the second transistor.