An organic light emitting diode (OLED) display comprising: a first pixel comprising a first pixel electrode of a pixel electrode, a second pixel comprising a second pixel electrode of the pixel electrode, and a third pixel comprising a third pixel electrode of the pixel electrode; a resonance assistance layer on the first pixel electrode, configured so that a gap between the pixel electrode and a common electrode is different in the first pixel than in the second pixel; an organic emission layer comprising a first organic emission layer on the resonance assistance layer and the second pixel electrode, a second organic emission layer on the first organic emission layer, and a third organic emission layer on the third pixel electrode, wherein the first organic emission layer and the second organic emission layer have the same pattern; a common electrode on the organic emission layer; and a color mixture preventing layer on the common electrode, the color mixture preventing layer being configured to absorb overlapped light corresponding to an overlapped wavelength region of a wavelength region of first light emitted by the first organic emission layer and a wavelength region of second light emitted by the second organic emission layer, wherein the color mixture preventing layer is formed in the first, second and third pixels; characterized in that a polarization film is formed directly on the color mixture preventing layer, wherein the color mixture preventing layer comprises a mixed layer of an adhesive of the polarization film and an absorber for absorbing the overlapped light, and the colour mixture preventing layer is formed as a single, uninterrupted colour mixture preventing layer covering the first, second and third pixels. a first pixel comprising a first pixel electrode of a pixel electrode, a second pixel comprising a second pixel electrode of the pixel electrode, and a third pixel comprising a third pixel electrode of the pixel electrode; a resonance assistance layer on the first pixel electrode, configured so that a gap between the pixel electrode and a common electrode is different in the first pixel than in the second pixel; an organic emission layer comprising a first organic emission layer on the resonance assistance layer and the second pixel electrode, a second organic emission layer on the first organic emission layer, and a third organic emission layer on the third pixel electrode, wherein the first organic emission layer and the second organic emission layer have the same pattern; a common electrode on the organic emission layer; and a color mixture preventing layer on the common electrode, the color mixture preventing layer being configured to absorb overlapped light corresponding to an overlapped wavelength region of a wavelength region of first light emitted by the first organic emission layer and a wavelength region of second light emitted by the second organic emission layer, wherein the color mixture preventing layer is formed in the first, second and third pixels; characterized in that a polarization film is formed directly on the color mixture preventing layer, wherein the color mixture preventing layer comprises a mixed layer of an adhesive of the polarization film and an absorber for absorbing the overlapped light, and the colour mixture preventing layer is formed as a single, uninterrupted colour mixture preventing layer covering the first, second and third pixels.