Organic light emitting display and driving method thereof

An organic light emitting display, comprising:

• a plurality of pixels, each arranged near intersections of data lines, scan lines, power lines and light emitting control lines;
• a scan driver configured to supply a scan signal to the scan lines and to supply a light emitting control signal to the light emitting control lines;
• a control line driver configured to supply a first control signal to first control lines and to supply a second control signal to second control lines;
• a data driver configured to generate a data signal for the data lines;
• a sensing unit configured to sense information about at least one of an organic light emitting diode, a threshold voltage of a drive transistor, and mobility of the drive transistor for one or more of the pixels;
• a switching unit configured to couple one of the sensing unit and the first power source with the power lines;
• a control block configured to store the sensed information;
• and
• a timing controller configured to generate the second data based on the sensed information and a first data received from another circuit,
• wherein the sensing unit comprises:
• an electric current source unit in each of a plurality of channels;
• and
• an analog-digital converter configured to convert sensed information about deterioration of the organic light emitting diode and threshold voltage and/or mobility of the drive transistor into a first digital value and to convert information about deterioration of the organic light emitting diode into a second digital value.