An organic light emitting display device includes a first electrode formed on a substrate, a second electrode facing the first electrode, a blue emission layer formed between the first and second electrodes, a capping layer formed on the second electrode, and a front sealing layer formed on the capping layer and comprising an inorganic barrier layer and an organic barrier layer alternately formed at least once, wherein a luminescent dopant included in the blue emission layer has a maximum photoluminescence wavelength of 465 nm or less, and blue light generated from the blue emission layer and emitted via the front sealing layer or the substrate has a Y color coordinate (CIEy) of 0.055 or less.