Patent ID: 9692013
Date: 2017-06-27
CPC Classifications: H01L

Claim:
1. An organic light emitting device including red, green, and blue pixels, the organic light emitting device comprising: a first emission unit configured to include a first hole transport layer, a first electron transport layer on the first hole transport layer, and a common blue emission layer disposed between the first hole transport layer and the first electron transport layer, the common blue emission layer disposed in a plane common to the red, green and blue pixels; a second emission unit configured to include a red emission material layer in the red pixel, a green emission material layer in the green pixel, and a blue emission material layer in the blue pixel, each of the red, green, and blue emission material layers being respectively configured to emit light having a different wavelength range; a charge generation layer disposed between the first emission unit and the second emission unit; a common first electrode including a reflective material disposed in another plane such that the common first electrode is common to the red, green and blue pixels, the common first electrode being configured to supply electric charges having a first polarity to the first emission unit and the second emission unit; and a plurality of second electrodes each including a semi-transmissive electrode and respectively disposed in the red, green and blue pixels, the second electrodes configured to supply electric charges having a second polarity to the first emission unit and the second emission unit, wherein respective micro cavities are defined in each of the red, green and blue pixels between the common first electrode and the respective second electrodes, wherein the second emission unit further comprises a second hole transport layer and at least one of a red hole transport layer directly on the second hole transport layer in the red pixel and a green hole transport layer directly on the second hole transport layer in the green pixel, and wherein the red hole transport layer is separate from the a green hole transport layer.