Patent ID: 7986317

Claim:
A organic light emitting display, comprising: a scan driver connected to scan lines; a data driver connected to data lines; pixels connected to the scan lines and the data lines, the pixels being adapted to generate light while applying an electric current from a first power source to a second power source through an organic light emitting diode; a power source unit adapted to generate the first power source; and a compensating unit adapted to control a voltage value of the first power source, the compensating unit including a resistor between the power source unit and the pixels, an amplifier adapted to amplify a voltage across the resistor, a reference voltage generator adapted to generate a reference voltage, a comparator adapted to compare the amplified voltage with the reference voltage, a counter adapted to generate a counter signal counting up or down a count according to a comparison result of the comparator, and a controller adapted to supply a feedback signal to the power source unit, the feedback signal being generated in accordance with the counter signal.