Patent ID: 8149186

Claim:
A pixel, comprising: an organic light emitting diode; a first transistor controlling a current supplied to the organic light emitting diode; a pixel circuit configured to compensate a threshold voltage of the first transistor; and a compensating unit controlling a voltage of a gate electrode of the first transistor in order to compensate for deterioration of the organic light emitting diode, wherein the compensating unit includes: second and third transistors coupled in series between the organic light emitting diode and a first power source, the second and third transistors being commonly connected to a first node therebetween, first and second feedback capacitors coupled in series between the first node and a second node, the second node being coupled to the gate electrode of the first transistor, and a fourth transistor coupled between a predetermined voltage source and a third node that is common to the first and second feedback capacitors, wherein the pixel circuit includes: a fifth transistor having a gate electrode coupled to an i th scan line, the fifth transistor being turned-on to couple a data line to a first electrode of the first transistor when a scan signal is supplied to the i th scan line, a sixth transistor having a gate electrode coupled to the i th scan line, the sixth transistor being turned-on to couple a second electrode of the first transistor to the second node when the scan signal is supplied to the i th scan line, a seventh transistor having a gate electrode coupled to an i−1 th scan line, the seventh transistor being turned-on to couple an initialization power source to the second node when a scan signal is supplied to the i−1 th scan line, an eighth transistor having a gate electrode coupled to an i th light emitting control line, the eighth transistor being turned-on to couple the first electrode of the first transistor to the first power source when a light emitting control signal is not supplied to the i th light emitting control line, a ninth transistor having a gate electrode coupled to the i th light emitting control line, the ninth transistor being turned-on to couple the second electrode of the first transistor to the organic light emitting diode when the light emitting control signal is not supplied to the i th light emitting control line, and a storage capacitor coupled between the second node and the first power source, wherein: the i th scan line is defined with i as a natural number; and the i th light emitting control line is defined with i as a natural number.