Data driving circuit, organic light emitting diode (OLED) display using the data driving circuit, and method of driving the OLED display

An Organic Light Emitting Diode (OLED) display, comprising:

• a plurality of first and second scan lines;
• a plurality of data lines intersecting the first and second scan lines;
• a pixel portion including a plurality of pixels connected to the first and second scan lines and the data line;
• a scan driver adapted to respectively supply first and second scan signals to the first and second scan lines;
• and a data driver connected to the data line and adapted to supply a first gradation voltage as a data signal to the data line;
• wherein the data driver is adapted to receive a feedback pixel current from each pixel via the data line, to generate a second gradation voltage by selectively increasing or decreasing a level of the first gradation voltage in accordance with the feedback pixel current, and to supply the second gradation voltage to the pixel.

A method of driving an Organic Light Emitting Diode (OLED) display, comprising:

• generating a first gradation voltage and a gradation current corresponding to data;
• supplying a first gradation voltage to the pixel via the data line;
• generating a pixel current with the pixel corresponding to the first gradation voltage;
• supplying the pixel current to the data driver via the data line;
• and
• comparing the gradation current with the pixel current with the data driver, and generating a second gradation voltage by increasing or decreasing a level of the first gradation voltage on the basis of the compared result.