An organic light emitting display device includes a plurality of pixels, a data driver, and a plurality of demultiplexers. The pixels are in an area defined by scan lines and data lines. The data driver progressively supplies data signals to output lines every horizontal period. The demultiplexers are coupled to respective ones of the output lines. Each demultiplexer supplies data signals to a first number of data lines coupled to the demultiplexer during a horizontal period.