Pixel with current diffusion, method of driving the pixel, and organic light emitting display device including the pixel

An organic light emitting display device comprising:

• a scan driver configured to supply scan signals to n (n is a natural number greater than or equal to 2) scan lines;
• a data driver configured to supply data signals to m (m is a natural number greater than or equal to 2) data lines;
• a control driver configured to supply control signals to a first control line and to a second control line;
• and
• a plurality of pixels connected to the scan lines, the data lines, the first control line, and the second control line, each of the plurality of pixels comprising a first sub-pixel, a second sub-pixel, and a third sub-pixel that are configured to display different colors from each other, and that are sequentially positioned,
• wherein each of the first sub-pixel, the second sub-pixel, and the third sub-pixel that is connected to an ith (i is a natural number less than or equal to m) data line comprises:
• a first transistor connected between the ith data line and a first node;
• a second transistor connected between a first power source and a second node, the second transistor comprising a gate electrode connected to the first node;
• a third transistor connected between the first power source and the second transistor;
• a capacitor connected between the first node and the second node;
• and
• an organic light emitting diode (OLED) connected between the second node and a second power source,
• wherein at least one of the first sub-pixel, the second sub-pixel, and the third sub-pixel that is connected to the ith data line comprises a fourth transistor comprising a first electrode connected to the ith data line and a second electrode connected to a cathode of the OLED,
• wherein a signal having the same voltage level as that of the second power source is supplied to the ith data line when the fourth transistor is in an on state, and
• wherein the first transistor is configured to be in an off state, and the second transistor, the third transistor, and the fourth transistor are configured to be in on states, during a period.

A method of driving a pixel comprising a first transistor, a second transistor between a first power source and an organic light emitting diode (OLED), a third transistor, a fourth transistor comprising a first electrode connected to a data line and a second electrode connected to a cathode of the OLED, and a capacitor, the method comprising:

• turning on the first transistor to supply a reference voltage to a gate electrode of the second transistor, while a voltage level of the first power source is at a low level;
• changing the voltage level of the first power source to a high level, and storing a threshold voltage of the second transistor in the capacitor;
• turning on the first transistor to supply a data voltage to the gate electrode of the second transistor through the data line;
• supplying a driving current corresponding to a voltage stored in the capacitor from the second transistor to the OLED after turning on the fourth transistor;
• and
• supplying a voltage having a second low level as the data voltage to the data line when the fourth transistor is turned on,
• wherein the cathode of the OLED is connected to a second power source, and
• wherein the first transistor is configured to be in an off state, and the second transistor, the third transistor, and the fourth transistor are configured to be in on states, during a period.