Patent ID: 8823613

Claim:
A pixel circuit comprising: a fourth NMOS transistor comprising a gate electrode coupled to a first scan line and a first electrode coupled to a first node; a storage capacitor coupled between the first node and a second node; a third NMOS transistor comprising a gate electrode coupled to a second scan line and a first electrode coupled to a data line; a second NMOS transistor comprising a first electrode coupled to a second electrode of the third NMOS transistor and a gate electrode and a second electrode commonly coupled to the first node; a fifth NMOS transistor comprising a gate electrode coupled to an emission control line and a first electrode coupled to a first power source; an organic light emitting diode comprising an anode coupled to the second node; a first NMOS transistor for providing a driving current to the organic light emitting diode, the first NMOS transistor comprising a gate electrode coupled to the first node, a first electrode coupled to a second electrode of the fifth NMOS transistor, and a second electrode coupled to the second node; and a sixth NMOS transistor comprising a gate electrode coupled to the second scan line, a first electrode coupled to a reference power source, and a second electrode coupled to the second node, wherein the sixth NMOS transistor is configured to transfer a reference voltage from the reference power source to the second node when a second scan signal is transmitted through the second scan line, wherein the reference voltage is less than a threshold voltage of the organic light emitting diode.