Organic light emitting display and driving method thereof to characterize pixel parameter values

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 control signal to a plurality of control lines;
• a data driver configured to generate a data signal for the data lines;
• a sensing unit configured to sense an information about at least one of deterioration of an organic light emitting diode, a threshold voltage of a drive transistor, and a mobility of the drive transistor for one or more of the pixels;
• a switching unit configured to selectively connect either of the sensing unit and a first power source with the power lines and to selectively connect either of the sensing unit and the data driver with the data lines, wherein while the sensing unit is connected with the power lines, the first power source is not connected with the power lines, and wherein while the sensing unit is connected with the data lines, the data driver is not connected with the data lines;
• a control block configured to store the sensed information;
• and
• a timing controller configured to generate a 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 located in each of a plurality of channels, and
• an analog-digital converter configured to convert the sensed information about the deterioration of the organic light emitting diode and the threshold voltage and/or the mobility of the drive transistor into a first digital value and to convert the information about the deterioration of the organic light emitting diode into a second digital value, and
• wherein the switching unit includes four switching elements in every channel, wherein the four switching elements comprise:
• a first switching element located between the first power source and a selected one of the power lines, the first switching element configured to be turned on when the first power source is supplied to the selected power line;
• a second switching element located between the electric current source unit and the selected the power line, the second switching element configured to be turned on when the information about the threshold voltage and/or the mobility of the drive transistor and the deterioration of the organic light emitting diode are sensed;
• a third switching element located between the electric current source unit and the data line, the third switching element configured to be turned on when the information about the deterioration of the organic light emitting diode is sensed;
• and
• a fourth switching element located between the data driver and the data line, the fourth switching element configured to be turned on when the data signal is supplied to the data lines.