Patent ID: 8269702

Claim:
An organic light emitting display device comprising: a scan driver for supplying a scan signal to scan lines during scan periods of a plurality of sub-frames included in one frame; a data driver for supplying data signals to data lines when the scan signal is supplied; pixels at crossing regions of the scan lines and the data lines, each of the pixels configured to control whether or not a current flows from a first power to a second power both coupled to the pixels, the current corresponding to a corresponding one of the data signals; a power supply for supplying the first power to a power line coupled to the pixels; a sensing resistor coupled between the power supply and the power line; and a power controller for controlling the power supply to adjust a voltage value of the first power to correspond to an amount of current that flows through the sensing resistor and data of a current frame, wherein the power controller comprises: a first generator for generating a first comparative value by utilizing the amount of current that flows through the sensing resistor and an amount of current that would flow through the sensing resistor if the pixels emit full white light; a second generator for generating a second comparative value by utilizing the data of the current frame and data for one frame in which the pixels emit full white light; a comparator for generating a control signal while comparing the first comparative value with the second comparative value; and a controller for controlling the power supply in accordance with the control signal so that the first comparative value is substantially identical to the second comparative value.