Patent ID: 8665254

Claim:
A pixel circuit for a display panel comprising: an organic light emitting diode (OLED) comprising an anode and a cathode; a first NMOS transistor comprising a first electrode coupled to a first node, a second electrode coupled to the anode of the OLED, and a gate electrode coupled to a second node; a second NMOS transistor comprising a first electrode coupled to the second node, a second electrode coupled to the first node, and a gate electrode; a third NMOS transistor comprising a first electrode coupled to a first power source, a second electrode coupled to the first node, and a gate electrode; a fourth NMOS transistor comprising a first electrode coupled to a data line, a second electrode coupled to a third node, and a gate electrode; a fifth NMOS transistor comprising a first electrode coupled to a reference power source, a second electrode coupled to the third node, and a gate electrode; a sixth NMOS transistor comprising a first electrode, a second electrode coupled to the anode of the OLED, and a gate electrode; a seventh NMOS transistor comprising a first electrode, a second electrode coupled to the first electrode of the sixth NMOS transistor, and a gate electrode; a first capacitor coupled between the second node and the third node; a second capacitor coupled between the third node and the anode of the OLED; and a third capacitor coupled between the second node and the first electrode of the sixth NMOS transistor, wherein a current scan signal is applied to the gate electrode of the sixth NMOS transistor.