Pixel circuit and organic electroluminescent display including the same

A pixel circuit comprising:

• an organic light emitting diode;
• a fifth NMOS transistor comprising a gate electrode coupled to a second scan line, a first electrode coupled to a reference power source, and a first electrode coupled to a first node;
• a first capacitor coupled between the first node and a second node;
• a second capacitor coupled between the first node and an anode of the organic light emitting diode;
• a fourth NMOS transistor comprising a gate electrode coupled to a third scan line, a first electrode coupled to a data line, and a second electrode coupled to the first node;
• a sixth NMOS transistor comprising a gate electrode coupled to a first scan line, a first electrode coupled to a first power source, and a second electrode coupled to the second node;
• a second NMOS transistor comprising a gate electrode coupled to the second scan line, a first electrode coupled to the second node, and a second electrode coupled to a third node;
• a third NMOS transistor comprising a gate electrode coupled to an emission control line, a first electrode coupled to the first power source, and a second electrode coupled to the third node;
• and
• 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 second node, a first electrode coupled to the third node, and a second electrode coupled to the anode of the organic light emitting diode.

An organic light emitting display comprising:

• a scan driver for supplying scan signals to scan lines and emission control signals to emission control lines;
• a data driver for supplying data signals to data lines;
• and
• pixel circuits at crossing regions of the scan lines, the emission control lines, and the data lines, wherein at least one of the pixel circuits comprises:
• an organic light emitting diode;
• a fifth NMOS transistor comprising a gate electrode coupled to a third scan line of the scan lines and a first electrode coupled to a first node;
• a first capacitor coupled between the first node and a second node;
• a second capacitor coupled between the first node and an anode of the organic light emitting diode;
• a fourth NMOS transistor comprising a gate electrode coupled to a second scan line of the scan lines, a first electrode coupled to a data line of the data lines, and a second electrode coupled to the first node;
• a sixth NMOS transistor comprising a gate electrode coupled to a first scan line of the scan lines, a first electrode coupled to a first power source, and a second electrode coupled to the second node;
• a second NMOS transistor comprising a gate electrode coupled to the second scan line, a first electrode coupled to the second node, and a second electrode coupled to a third node;
• a third NMOS transistor comprising a gate electrode coupled to an emission control line of the emission control lines, a first electrode coupled to the first power source, and a second electrode coupled to the third node;
• and
• 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 second node, a first electrode coupled to the third node, and a second electrode coupled to the anode of the organic light emitting diode.

An organic light emitting display comprising:

• a scan driver for supplying scan signals to scan lines and emission control signals to emission control lines;
• a data driver for supplying data signals to data lines;
• and
• pixel circuits at crossing regions of the scan lines, the emission control lines, and the data lines, wherein at least one of the pixel circuits comprises:
• an organic light emitting diode;
• a fifth NMOS transistor comprising a gate electrode coupled to a second scan line of the scan lines and a first electrode coupled to a first node;
• a first capacitor coupled between the first node and a second node;
• a second capacitor coupled between the first node and an anode of the organic light emitting diode;
• a fourth NMOS transistor comprising a gate electrode coupled to a third scan line of the scan lines, a first electrode coupled to a data line of the data lines, and a second electrode coupled to the first node;
• a sixth NMOS transistor comprising a gate electrode coupled to a first scan line of the scan lines, a first electrode coupled to a first power source, and a second electrode coupled to the second node;
• a second NMOS transistor comprising a gate electrode coupled to the second scan line, a first electrode coupled to the second node, and a second electrode coupled to a third node;
• a third NMOS transistor comprising a gate electrode coupled to an emission control line of the emission control lines, a first electrode coupled to the first power source, and a second electrode coupled to the third node;
• and
• 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 second node, a first electrode coupled to the third node, and a second electrode coupled to the anode of the organic light emitting diode.