Organic light emitting display device

An organic light emitting display device comprising:

• a first electrode and a second electrode facing each other on a substrate;
• a blue emission layer formed between the first electrode and the second electrode;
• a hole injection layer and a hole transport layer, formed between the blue emission layer and the first electrode;
• and an electron transport layer formed between the blue emission layer and the second electrode, wherein the hole injection layer is formed by doping a host formed of HAT-CN with 1 vol. % to less than 3 vol. % of a dopant that is a hole transporting material based on a volume of the hole injection layer, wherein the dopant is formed of at least one of N,N-dinaphthyl-N,N′-diphenyl benzidine (NPD), N,N′-bis-(3-methylphenyl)-N,N′-bis-(phenyl)-benzidine (TPD), or s-TAD.