Organic light emitting display device

An organic light emitting display device comprising:

• a substrate;
• an organic light emitting element on the substrate;
• a thin film encapsulation layer on the organic light emitting element;
• and
• wherein the thin film encapsulation layer comprises a first thin film, a second thin film and a third thin film, which are sequentially stacked therein,
• a refractive index of the second thin film is about 1.7 or greater,
• a refractive index of the first thin film and a refractive index of the third thin film are greater than the refractive index of the second thin film,
• each of the refractive index of the first thin film and the refractive index of the third thin film is about 2.3 or greater, and
• a reflectance of the thin film encapsulation layer is about 30% or greater at a wavelength of about 780 nm.