Patent ID: 7843442

Claim:
An organic light emitting display, comprising a plurality of pixels; a scan driver configured to supply a scan signal to scan lines; and at least one data driving circuit configured to supply a voltage data signal during a first period of at least one horizontal period, the voltage data signal being supplied through data lines to the pixels selected by the scan signal, the driving circuit being further configured to provide a current data signal to the pixels during a second period different from the first period, wherein each of the pixels comprise: an organic light emitting diode; and a pixel circuit electrically connected to at least one of the scan lines and to at least one of the data lines, the pixel circuit including: a drive transistor, configured to supply current to the organic light emitting diode, and a first capacitor, wherein the data driving circuit is configured to charge the first capacitor with a voltage corresponding to a difference between the first power supply and the voltage data signal and to charge the first capacitor with a voltage corresponding to the current of the current data signal flowing through the drive transistor, wherein the pixel circuit is configured to control the amount of current supplied to a second power supply from the first power supply through the organic light emitting diode according to the voltage charged across the first capacitor; first and second transistors connected to at least one data line, and configured to turn on in response to a scan signal supplied to an n (n is a positive integer)-th scan line; a third transistor electrically connected to the first power supply and to a second electrode of the first transistor, the third transistor being configured to turn on in response to the scan signal supplied to an (n−1) th scan line; a second capacitor connected to the first transistor, wherein the drive transistor co mprises a gate connected to a common terminal of the first and second capacitors, and a first electrode connected to the first power supply; and a fifth transistor connected to the gate and the second electrode of the drive transistor, configured to diode-connect the drive transistor in response to the scan signal supplied to the (n−1) th scan line.