Organic light emitting display and method of driving the same

An organic light emitting display comprising:

• a pixel unit comprising pixels coupled to scan lines, first control lines, second control lines, data lines, and first and second power sources;
• a control line driver for providing a first control signal and a second control signal to the pixels through the first control lines and the second control lines;
• a scan driver for providing scan signals to the pixels through the scan lines;
• and
• a data driver for providing data signals to the pixels through the data lines,
• wherein the scan driver simultaneously supplies a first scan signal to all of the scan lines of the pixel unit,
• and wherein each of the pixels comprises:
• an organic light emitting diode (OLED) having a cathode electrode coupled to the second power source;
• a first transistor having a first electrode coupled to the first power source;
• a second transistor having a first electrode coupled to a gate electrode of the first transistor, a second electrode coupled to a data line, and a gate electrode coupled to a scan line;
• a third transistor having a first electrode coupled to a second electrode of the first transistor, a second electrode coupled to a first node, and a gate electrode coupled to a first control line;
• a fourth transistor having a first electrode coupled to the first node, a second electrode coupled to an anode electrode of the OLED, and a gate electrode coupled to a second control line;
• a first capacitor coupled between the gate electrode of the first transistor and the first node;
• and
• a second capacitor coupled between the first node and the anode electrode of the OLED.