An organic light emitting display includes first sub-pixels, second sub-pixels and third sub-pixels at an area defined by scan lines and data lines; a data driver configured to supply an initialization voltage and data signals to output lines; demultiplexers coupled to respective ones of the output lines, each demultiplexer being configured to supply a plurality of the data signals to a plurality of the data lines; and a demultiplexer controller configured to control the demultiplexer so that data signals are concurrently supplied to at least one of the first sub-pixels, the second sub-pixels or the third sub-pixels.