Patent ID: 8599224

Claim:
An organic light emitting diode display having a plurality of pixels, each pixel comprising: an organic light emitting diode (OLED); a driving transistor for supplying a driving current to the organic light emitting diode; a data line for transmitting a corresponding data signal to the driving transistor; a first transistor having a first electrode connected to one electrode of the organic light emitting diode and a second electrode connected to the data line; and a second transistor having a first electrode connected to the data line and a second electrode connected to a gate electrode of the driving transistor: wherein the first transistor, the second transistor, and the driving transistor are turned on, a first current and a second current are respectively sunk in a path of a driving current from the driving transistor to the organic light emitting diode through the data line, and wherein a threshold voltage and an electron mobility of the driving transistor are calculated by receiving a first voltage and a second voltage applied to the gate electrode of the driving transistor corresponding to sinking of the first current and the second current through the second transistor and the data line, and the data signal transmitted to the data line is compensated.