Patent ID: 8878171

Claim:
An organic light emitting display device comprising: first and second electrodes facing each other on a substrate; a first stack comprising a hole injection layer, a first hole transport layer, a second hole transport layer, a first emitting layer, and a first electron transport layer that are sequentially stacked on the first electrode; a second stack comprising a third hole transport layer, a fourth hole transport layer, a second emitting layer comprising at least two hosts and a single dopant and having at least three emitting areas, and a second electron transport layer that are sequentially stacked between the first stack and the second electrode; and a charge generation layer formed between the first stack and the second stack and adjusting charge balance between the first and second stacks, wherein the second emitting layer comprises a first emitting area comprising a material of the fourth hole transport layer, a second emitting area comprising a material of the second electron transport layer, and a third emitting area comprising the at least two hosts.