The invention relates to an organic light-emitting display device. The device comprises a substrate, a packaging cover plate and an organic light-emitting device formed on the substrate, wherein light emitted from the organic light-emitting device is shot out from one side of the packaging cover plate, and the packaging cover plate comprises a photosensitive and light polarization material and a 1/4 lambda delay material; alternatively, the light emitted from the organic light-emitting device is shot out from one side of the substrate, and the substrate comprises a photosensitive and light polarization material and a 1/4 lambda delay material. When the organic light-emitting display device is exposed in a weak-light environment, a photosensitive component in the photosensitive and light polarization material is almost transparent and has high light transmittance, and the brightness of the display device is improved; when the organic light-emitting display device is exposed in a highlight environment, the photosensitive component in the photosensitive and light polarization material changes color and can absorb external light rays, and additionally the photosensitive and light polarization material has a light polarization effect, so that the photosensitive and light polarization material can further inhibit light emitting of external reflection light along with the 1/4 lambda delay material, and accordingly, the visibility of the display device can be remarkably improved.