Patent ID: 8847216

Claim:
An organic light emitting display device, comprising: a substrate; a thin film transistor formed on the substrate; a first electrode formed on the thin film transistor; an organic emission layer comprising: a first stack that comprises a first emission layer formed on the first electrode to emit light of a first color; a second stack that comprises a second emission layer formed on the first electrode to emit light of a second color; and a charge generation layer formed between the first and second stacks; and a second electrode formed on the organic emission layer, wherein: the first emission layer comprises a first dopant in such an amount that a first peak wavelength is shorter than a second peak wavelength, the first peak wavelength being a peak wavelength of the first color in a photoluminescence (PL) spectrum, the second peak wavelength being a peak wavelength of the first color in an emittance spectrum, and the second emission layer comprises a second dopant in such an amount that a third peak wavelength is shorter or longer than a fourth peak wavelength, the third peak wavelength being a peak wavelength of the second color in the PL spectrum, the fourth peak wavelength being a peak wavelength of the second color in the emittance spectrum.