Patent ID: 8558763

Claim:
An organic light emitting display apparatus comprising: a plurality of pixels, each pixel including an organic light emitting device (OLED) and a pixel circuit, the pixel circuit comprising a switch coupled to the OLED to control an emission period of the OLED; a data driver for inputting a data signal to a plurality of data lines connected to the pixels; a scan driver for applying a selection signal to a plurality of selection scan lines connected to the pixels; a double speed timing generator for doubling a frame frequency and for applying a double speed frame signal to the scan driver; a data signal converter for doubling the input data signal, for dividing one frame into two sub-frames, for applying a first data signal having a level higher than a level of the input data signal during one sub-frame of the two sub-frames, and for applying a second data signal having a level lower than the level of the input data signal during the other sub-frame of the two sub-frames; and an emission driver for applying an emission signal, which is applied to control the switch, to a plurality of emission scan lines, connected to the pixels, wherein the selection scan lines comprise a first selection scan line and a second selection scan line, wherein the pixel circuit comprises a first switching transistor, a second switching transistor, a first capacitor, a second capacitor, and a driving transistor, wherein the first switching transistor is configured to transfer a data voltage applied to the plurality of data lines in response to a first selection signal applied to the first selection scan line, wherein the first capacitor is configured to store a voltage corresponding to a threshold voltage of the driving transistor, wherein the second capacitor is configured to store a voltage corresponding to the transferred data voltage, wherein the second switching transistor is configured to electrically connect a terminal of the first capacitor to a power supply line in response to a second selection signal applied to the second selection scan line, and wherein the driving transistor is configured to supply a current from the power supply line to the organic light emitting device corresponding to the voltages stored in the first capacitor and the second capacitor.