Organic light emitting display apparatus having pixels of different structures

Patent metadata

Field	Value
Publication number	US-11974480-B2
Application number	US-202017117702-A
Country	US
Kind code	B2
Filing date	Dec 10, 2020
Priority date	Dec 31, 2019
Publication date	Apr 30, 2024
Grant date	Apr 30, 2024

Abstract

An organic light emitting display apparatus includes a substrate including a plurality of pixels. The organic light emitting display apparatus further includes a plurality of organic light emitting diodes on the substrate so as to correspond to the plurality of pixels. The plurality of pixels includes a first pixel, a second pixel, a third pixel, and a fourth pixel which emit different color light. Each of the plurality of organic light emitting diodes includes a first electrode, a light emitting portion on the first electrode and a second electrode on the light emitting portion. A thickness of the first electrode of the first pixel is different from a thickness of the first electrode of the second pixel, and the thickness of the first electrode of the second pixel is different from a thickness of the first electrode of the third pixel.

First claim

What is claimed is:

1. An organic light emitting display apparatus, comprising:
a substrate including a plurality of pixels; and
a plurality of organic light emitting diodes disposed on the substrate so as to correspond to the plurality of pixels,
wherein the plurality of pixels includes a first pixel, a second pixel, a third pixel, and a fourth pixel, and emit different color lights,
wherein each of the plurality of organic light emitting diodes includes:
a first electrode;
a light emitting portion on the first electrode; and
a second electrode on the light emitting portion,

wherein a thickness of the first electrode of the first pixel is different from a thickness of the first electrode of the second pixel, and the thickness of the first electrode of the second pixel is different from a thickness of the first electrode of the third pixel, and
wherein the first pixel is a white pixel, the second pixel is a red pixel, the third pixel is a green pixel, and the fourth pixel is a blue pixel.

2. The organic light emitting display apparatus according to claim 1 , wherein the thickness of the first electrode of the first pixel is equal to the thickness of the first electrode of the third pixel, and
the thickness of the first electrode of the second pixel is equal to a thickness of the first electrode of the fourth pixel.

3. The organic light emitting display apparatus according to claim 1 , wherein the thickness of the first electrode of the first pixel, the thickness of the first electrode of the third pixel, and a thickness of the first electrode of the fourth pixel are equal to one another.

4. The organic light emitting display apparatus according to claim 1 , wherein the thickness of the first electrode of the first pixel is different from the thickness of the first electrode of the third pixel, and
the thickness of the first electrode of the second pixel is equal to a thickness of the first electrode of the fourth pixel.

5. The organic light emitting display apparatus according to claim 1 , wherein the thickness of the first electrode of the first pixel is different from the thickness of the first electrode of the third pixel, and
the thickness of the first electrode of the third pixel is equal to a thickness of the first electrode of the fourth pixel.

6. The organic light emitting display apparatus according to claim 1 , wherein the thickness of the first electrode of the first pixel is different from the thickness of the first electrode of the third pixel, and
the thickness of the first electrode of the first pixel is equal to a thickness of the first electrode of the fourth pixel.

7. The organic light emitting display apparatus according to claim 1 , wherein the thickness of the first electrode of the first pixel is equal to the thickness of the first electrode of the third pixel, and
the thickness of the first electrode of the first pixel, the thickness of the first electrode of the second pixel, and a thickness of the first electrode of the fourth pixel are different from one another.

8. The organic light emitting display apparatus according to claim 1 , wherein the thicknesses of the first electrodes of the first pixel, the second pixel, the third pixel, and the fourth pixel are different from one another.

9. The organic light emitting display apparatus according to claim 1 , wherein the light emitting portion includes a hole transport layer disposed on the first electrode, and
a thickness of the hole transport layer is approximately 100 Å to 2200 Å.

10. The organic light emitting display apparatus according to claim 9 , wherein when the thickness of the hole transport layer is approximately 100 Å to 1000 Å,
the thickness of the first electrode of the first pixel is approximately 200 Å to 1600 Å or approximately 2000 Å to 2400 Å,
the thickness of the first electrode of the second pixel is approximately 200 Å to 1000 Å or approximately 1700 Å to 2400 Å,
the thickness of the first electrode of the third pixel is approximately 800 Å to 1600 Å, and
a thickness of the first electrode of the fourth pixel is approximately 200 Å to 1000 Å or approximately 1200 Å to 2000 Å, or approximately 2200 Å to 2400 Å.

11. The organic light emitting display apparatus according to claim 9 , wherein when the thickness of the hole transport layer is approximately 1000 Å to 2200 Å,
the thickness of the first electrode of the first pixel is approximately 100 Å to 600 Å or approximately 1000 Å to 1800 Å,
the thickness of the first electrode of the second pixel is approximately 200 Å to 1200 Å or approximately 1600 Å to 2400 Å,
the thickness of the first electrode of the third pixel is approximately 100 Å to 600 Å or approximately 1200 Å to 2200 Å, and
a thickness of the first electrode of the fourth pixel is approximately 100 Å to 600 Å or approximately 1200 Å to 2000 Å.

12. The organic light emitting display apparatus according to claim 1 , wherein the light emitting portion includes:
a first light emitting portion on the first electrode and including a blue light emitting layer;
a second light emitting portion on the first light emitting portion and including a red light emitting layer and two yellow-green light emitting layers; and
a third light emitting portion on the second light emitting portion and including a blue light emitting layer.

13. The organic light emitting display apparatus according to claim 12 , wherein a thickness of the first light emitting portion is approximately 400 Å to 3100 Å,
a thickness of the second light emitting portion is approximately 750 Å to 1350 Å,
a thickness of the third light emitting portion is approximately 1200 Å to 1800 Å,
a distance between a center of the blue light emitting layer of the first light emitting portion and the second electrode is approximately 2500 Å to 3100 Å,
a distance between a center of the red light emitting layer of the second light emitting portion and the second electrode is approximately 2000 Å to 2600 Å,
a distance between a boundary of the two yellow-green light emitting layers of the second light emitting portion and the second electrode is approximately 1700 Å to 2300 Å, and
a distance between a center of the blue light emitting layer of the third light emitting portion and the second electrode is approximately 100 Å to 700 Å.

14. The organic light emitting display apparatus according to claim 1 , wherein the first electrode includes a transparent conductive material, and the second electrode includes a metal material.

15. An organic light emitting display apparatus, comprising:
a substrate including a plurality of pixels; and
a plurality of organic light emitting diodes on the substrate so as to correspond to the plurality of pixels,
wherein the plurality of pixels includes a white pixel, a red pixel, a green pixel, and a blue pixel,
each of the plurality of organic light emitting diodes includes:
a first electrode;
a first light emitting portion on the first electrode and including a blue light emitting layer;
a second light emitting portion on the first light emitting portion and including a red light emitting layer and two yellow-green light emitting layers;
a third light emitting portion on the second light emitting portion and including a blue light emitting layer; and
a second electrode on the third light emitting portion,

wherein a thickness of the first electrode of the white pixel is different from a thickness of the first electrode of the red pixel, and the thickness of the first electrode of the red pixel is different from a thickness of the first electrode of the green pixel.

Assignees

• Lg Display Co Ltd

Inventors

• Lee Jaeho
• Koo Wonhoe
• Sim Dongmin
• Kim Taemin
• Choi Hyekyung
• Han Kyunghoon

Classifications

• H10K50/81

  Anodes · CPC title

• H10K59/876

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• H10K59/8051

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• H10K2101/20

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• H10K59/353 Primary

  characterised by the geometrical arrangement of the RGB subpixels · CPC title