Organic light emitting display device

An organic light emitting display device comprising:

• pixels at crossing regions of scan lines, control lines, and data lines;
• a data driver configured to supply data signals to the data lines;
• a compensation unit configured to extract compensation information of the pixels in a sensing period and configured to generate second data by changing a bit of first data input from the outside using the compensation information,
• wherein each of the pixels comprises:
• an organic light emitting diode;
• a first transistor configured to control an amount of a current that flows from a first power source to a second power source via the organic light emitting diode in response to a voltage of a first node;
• a second transistor connected between the data driver and the first node and configured to turn on when a scan signal is supplied to a scan line;
• a third transistor connected between the compensation unit and an anode electrode of the organic light emitting diode and configured to turn on when a control signal is supplied to a control line;
• and
• a storage capacitor connected between the first node and the anode electrode of the organic light emitting diode,
• wherein the compensation information comprises at least one of deviation information of the first transistor and deterioration information of the organic light emitting diode.