Organic light emitting display device and pixel sensing method of the same

A display device comprising:

• a display panel having a first pixel and a second pixel;
• a driving circuit coupled to the display device, the driving circuit for providing a preset sensing voltage to the first pixel of a display panel and providing a dummy voltage to the second pixel of the display panel;
• a sensing circuit coupled to the display panel, the sensing circuit for sensing a current generated by the first and second pixels of the display panel, the sensing circuit comprising:
• a first channel coupled to the first pixel, the first channel generating a first integrated voltage signal indicative of a magnitude of a first pixel current generated by the first pixel in response to the sensing voltage, and
• a second channel coupled to the second pixel, the second channel generating a second integrated voltage signal indicative of a magnitude of a first dummy current generated by the second pixel in response to the dummy voltage;
• and
• a compensation circuit coupled to the display panel, the compensation circuit determining a first compensation amount from a difference between an output of the first and second channels of the sensing circuit, and compensating a display voltage of the first pixel by the determined first compensation amount in a subsequent display frame of the display device,
• wherein the dummy voltage is higher than a data voltage of a black grayscale and lower than a reference voltage,
• wherein the data voltage of the black grayscale is capable of turning the first and second pixels off, and
• wherein the reference voltage is applied to a first amplifier included in the first channel and applied to a second amplifier included in the second channel.