A pixel arrangement of an organic light emitting display device with a plurality of repeatedly arranged sub-pixel groups, each of the sub-pixel groups includes two first sub-pixels in i-th and (i+2)-th columns (i is a natural number), two second sub-pixels in the i-th and (i+2)-th columns, the second sub-pixels being arranged in different rows with respect to the first sub-pixels, and two third sub-pixels in (i+1)-th and (i+3)-th columns, each third sub-pixel being arranged to overlap at least two adjacent rows of the first and second sub-pixels.