Organic light emitting display device and method of driving the same

A method of driving an organic light emitting display device which includes a display panel including a plurality of pixels including a pixel circuit for emitting light from an organic light emitting diode (OLED) and a driving circuit unit driving the display panel, the method comprising:

• when the organic light emitting display device is powered on, displaying an image in a driving mode, and sequentially sensing characteristics of driving thin film transistors (TFTs) of the plurality of pixels in units of one horizontal line in real time during a blank interval between frames;
• sequentially compensating for the characteristics of the driving TFTs of the plurality of pixels in units of one horizontal line in real time by using a real-time sensing data generated by real-time sensing;
• when the organic light emitting display device is powered off, sensing characteristics of driving TFTs of the plurality of pixels to generate sensing data at a power-off time;
• and
• merging initial compensation data and the sensing data at the power-off time to compensate for the characteristics of the driving TFTs of the plurality of pixels, the initial compensation data being generated when initial compensation is performed before the display panel is released.

A method of driving an organic light emitting display device which includes a display panel including a plurality of pixels each including a pixel circuit for emitting light from an organic light emitting diode (OLED) and a driving thin film transistor (TFT), the method comprising:

• performing a sensing operation to generate sensing data at at least one of a power-on time when the OLED is powered on, a driving time when an image is displayed, and a power-off time when the OLED is powered off, wherein the sensing data corresponds to a threshold voltage of the driving TFT;
• updating initial compensation data by merging the initial compensation data with the sensing data to generate an updated compensation data;
• and
• driving the driving TFT based on the updated compensation data.

An organic light emitting display device, which includes a display panel including a plurality of pixels each including a pixel circuit for emitting light from an organic light emitting diode, the organic light emitting display device comprising:

• a driving circuit unit including a data driver and a gate driver;
• a sensing unit configured to operate the data driver and the gate driver of the driving circuit unit in a sensing mode to allow all the pixels of the display panel to be sensed and to generate sensing data, at a power-on time when the display device is powered on or a power-off time when the display device is powered off;
• a compensation data calculating unit in communication with the sensing unit and configured to load an initial compensation data, calculate changes in characteristics of driving thin film transistors (TFTs) of all the pixels and merge the sensing data and the initial compensation data to update a compensation data;
• and a panel driving unit configured to supply data voltages compensated by the compensation data to the respective pixels to compensate for the characteristics of the driving TFTs of the respective pixels.