Organic light-emitting display panel, method for adjusting color temperature thereof, and display device

Patent metadata

Field	Value
Publication number	US-10910604-B2
Application number	US-201815912252-A
Country	US
Kind code	B2
Filing date	Mar 5, 2018
Priority date	Jul 26, 2017
Publication date	Feb 2, 2021
Grant date	Feb 2, 2021

Abstract

The disclosure discloses an organic light-emitting display panel, a method for adjusting color temperature thereof, and a display device, and the organic light-emitting display panel includes: an underlying substrate, and a plurality of light-emitting elements arranged on the underlying substrate; each of the light-emitting elements includes a first electrode, a first light-emitting layer, a second electrode, a second light-emitting layer, and a third electrode arranged on the underlying substrate in that order in a light exit direction of the organic light-emitting display panel, where a wavelength of emitted light from the first light-emitting layer is greater than a wavelength of emitted light from the second light-emitting layer; and the first electrode, the second electrode, and the third electrode are connected respectively with different voltage signal terminals.

First claim

The invention claimed is:

1. An organic light-emitting display panel, comprising: an underlying substrate, and a plurality of light-emitting elements arranged on the underlying substrate,
wherein each of plurality of the light-emitting elements comprises a first electrode, a first light-emitting layer, a second electrode, a second light-emitting layer, and a third electrode arranged on the underlying substrate in an order of a light exit direction of the organic light-emitting display panel; and
wherein a wavelength of emitted light from the first light-emitting layer is greater than a wavelength of emitted light from the second light-emitting layer;
wherein electric potentials are applied to the first, the third electrodes respectively, wherein a ground potential is applied to the second electrode;
wherein the plurality of light-emitting elements further comprises:
a first buffer layer located between the first light-emitting layer and the second electrode, and a second buffer layer located between the second electrode and the second light-emitting layer;
wherein a potential of the first electrode is higher than a potential of the second electrode, and the potential of the second electrode is higher than a potential of the third electrode;
wherein the first buffer layer is an N-type buffer layer which is an electron carrier injection layer, and the second buffer layer is a P-type buffer layer which is a hole carrier injection layer;
wherein the second electrode comprises a first sub-electrode and a second sub-electrode arranged in a stack, wherein the first sub-electrode is proximate to the N-type buffer layer, and the second sub-electrode is proximate to the P-type buffer layer;
wherein a work function of the first sub-electrode is lower than a work function of the second sub-electrode;
wherein a Lowest Unoccupied Molecular Orbital (LUMO) of the N-type buffer layer is 1.5 eV, and a Highest Unoccupied Molecular Orbital (HUMO) of the P-type buffer layer is 5.6 eV, and wherein a work function of the second electrode ranges from 3.5 eV to 5.5 eV;
wherein an electron mobility of the N-type buffer layer is greater than 10 −5 cm 2 V/s,
wherein the first electrode is a total reflection electrode, and the second electrode and the third electrode are semi-transmitting electrodes; and
wherein a de-coupling layer is arranged on a side of the third electrode away from the second light-emitting layer, wherein the de-coupling layer has a refractive index greater than 1.3.

2. The organic light-emitting display panel according to claim 1 , wherein the first light-emitting layer comprises: a first light-emitting sub-layer and a second light-emitting sub-layer arranged in a stack on the first electrode in the light exit direction of the organic light-emitting display panel; and
a wavelength of emitted light from the first light-emitting sub-layer is greater than a wavelength of emitted light from the second light-emitting sub-layer.

3. The organic light-emitting display panel according to claim 2 , wherein emitted light from the first light-emitting sub-layer is a red light, emitted light from the second light-emitting sub-layer is a green light, and emitted light from the second light-emitting layer is a blue light.

4. The organic light-emitting display panel according to claim 1 , wherein the first light-emitting sub-layer, the second light-emitting sub-layer, and the second light-emitting layer are structured in single layers, or stacks of layers.

5. A display device, comprising the organic light-emitting display panel according to claim 1 , and color filters arranged on a light exit side of the organic light-emitting display panel.

Assignees

• Shanghai Tianma Am Oled Co Ltd

Inventors

• Cheng Shuang
• Niu Jinghua
• Wang Xiangcheng
• Hamada Yuji
• Zhang Angran
• Yang Run

Classifications

• H10K71/00

  Manufacture or treatment specially adapted for the organic devices covered by this subclass · CPC title

• H10K59/32 Primary

  Stacked devices having two or more layers, each emitting at different wavelengths · CPC title

• H01L51/5234

  Electricity · mapped topic

• H01L27/322

  Electricity · mapped topic

• H01L51/504

  Electricity · mapped topic