US 2017/0256744 A1Published application

Organic light emitting device

AssigneeLG Display Co., Ltd.

InventorsSe Hee Lee, Joo Hwan Hwang, Sang Kyoung Moon

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Abstract

Disclosed is an organic light emitting device. The organic light emitting device includes a first emission unit configured to include a common blue emission material layer which is included in common in a plurality of pixels emitting lights having different wavelength ranges, a second emission unit configured to include a red emission material layer, a green emission material layer, and a blue emission material layer which respectively emit lights having different wavelength ranges, a charge generation layer disposed between the first emission unit and the second emission unit, a first electrode formed as a reflective electrode, and configured to supply an electric charge having a first polarity to the first emission unit and the second emission unit, and a second electrode formed as a semi-transmissive electrode, and configured to supply an electric charge having a second polarity to the first emission unit and the second emission unit.

Claims19

Dependent claims

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 and a common blue emission layer on the first hole transport layer, the common blue emission layer disposed in 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;
a charge generation layer between the first emission unit and the second emission unit;
a first electrode configured to supply electric charges having a first polarity to the first emission unit and the second emission unit;
and
a second electrode including a semi-transmissive electrode and 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 first electrode and the 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 the green pixel, and
wherein the red hole transport layer is separate from the a green hole transport layer.

6 more elements

An organic light emitting device including red, green, and blue pixels each of which defines a respective micro cavity, the organic light emitting device comprising:

a first emission unit including a common blue emission layer which is disposed in common to the red, green and blue pixels;
a second emission unit including 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,
a charge generation layer between the first emission unit and the second emission unit;
a first electrode including a reflective material and configured to supply electric charges having a first polarity to the first emission unit and the second emission unit;
and
a second electrode including a semi-transmissive electrode and configured to supply electric charges having a second polarity to the first emission unit and the second emission unit,
wherein the first emission unit comprises:
a hole injection layer on the first electrode;
a first hole transport layer on the hole injection layer;
a first electron transport layer on the common blue emission layer;
and
the common blue emission layer between the first hole transport layer and the first electron transport layer;
wherein the second emission unit comprises:
a second hole transport layer on the charge generation layer;
the red emission material layer, the green emission material layer, and the blue emission material layer on the second hole transport layer;
and
a second electron transport layer on the red emission material layer, the green emission material layer, and the blue emission material layer,
wherein the second emission unit further comprises 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 the green pixel, and
wherein the red hole transport layer is separate from the a green hole transport layer.

16 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/603,094Filed 23 May 2017
Priority: KR 10-2013-014475926 Nov 2013
Published: 7 Sep 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H10K 50/131
Comprising stacked EL layers within one EL unit: with spacer layers between the electroluminescent layers
H10K 50/19
OLEDs or polymer light-emitting diodes [PLED]: tandem OLEDs
H10K 59/876
Arrangements for extracting light from the devices: comprising a resonant cavity structure, e.g. Bragg reflector pair
H10K 50/15
Carrier transporting layers: hole transporting layers

Family

Application14/554,314Continuation · filed 26 Nov 2014
Application15/603,094Continuation
US 10,109,817 B2Related patent
US 2015/0144926 A1Published application
US 9,692,013 B2Related patent
US 2017/0256744 A1This patent

From the US filing history. Foreign family members aren’t listed.

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