Patent ID: 8125421

Claim:
An organic light emitting display device comprising: a display region comprising a scan line, a data line, a line having a feedback function, and a pixel coupled to the scan line, the data line and the line having the feedback function; a scan driver for supplying scan signals to the scan lines in sequence; and a data driving part coupled to the data line and the line having the feedback function, the data driving part for supplying a data voltage as a data signal to the data line, wherein the data driving part comprises a data driver, the data driver comprising: a shift register part for generating sampling signals in sequence; a latch part for storing external data in response to the sampling signals; a current digital-analog converter for generating a data current corresponding to the data stored in the latch part; and a comparator comprising a first input terminal for directly receiving the data current, a second input terminal for receiving a pixel current, and an output terminal for outputting a current that is substantially equal to a difference between the pixel current and the data current, wherein the data voltage supplied to the data line by the data driving part corresponds to the current outputted through the output terminal of the comparator, a switching part coupled between the current digital-analog converter and the comparator, the switching part configured to switch the pixel current and the data current supplied to the first input terminal and the second input terminal, respectively, wherein the switching part is configured to perform a switching operation depending on a conductivity type of a first transistor of the pixel.