Patent ID: 9735206
Date: 2017-08-15
CPC Classifications: H01L

Claim:
1. An organic light emitting display device comprising: first and second electrodes facing each other on a substrate; a charge generation layer between the first and second electrodes; a first light emitting unit comprising a first emission layer between the first electrode and the charge generation layer and configured to emit light of a first color, a first hole transport layer and a second hole transport layer supplying holes from the first electrode to the first emission layer, and a first electron transport layer supplying electrons from the charge generation layer to the first emission layer; and a second light emitting unit comprising a second emission layer between the second electrode and the charge generation layer and configured to emit light of a second color, a third hole transport layer and a fourth hole transport layer supplying holes from the charge generation layer to the second emission layer, and a second electron transport layer supplying electrons from the second electrode to the second emission layer, wherein a total thickness of the first and second hole transport layers is greater than that of the third and fourth hole transport layers, a thickness of the first hole transport layer is greater than a thickness of the third hole transport layer, and a hole mobility of the third hole transport layer is higher than a hole mobility of the first hole transport layer.