An organic light emitting display device includes a first substrate, a plurality of common lines, an optical member, and a second substrate. The first substrate includes a pixel region and a transparent region. The light emitting structure is disposed on the first substrate of the pixel region. The common lines are disposed adjacent to a boundary of the pixel region and the transparent region. The optical member prevents a light diffraction generated adjacent to the common lines. The second substrate is disposed on the light emitting structure and the optical member.