Organic light emitting display apparatus

Patent metadata

Field	Value
Publication number	US-12178104-B2
Application number	US-202318384196-A
Country	US
Kind code	B2
Filing date	Oct 26, 2023
Priority date	Dec 31, 2019
Publication date	Dec 24, 2024
Grant date	Dec 24, 2024

Abstract

An organic light emitting display apparatus includes a substrate including a plurality of pixels having a plurality of sub-pixels, a plurality of organic light emitting elements disposed at the plurality of sub-pixels, a plurality of light extraction patterns disposed on the plurality of organic light emitting elements and having different size at each of the plurality of sub-pixels, an encapsulation part disposed on the plurality of organic light emitting elements, and a planarization layer configured to planarize an upper portion of the plurality of the encapsulation part. The plurality of light extraction patterns are disposed on the planarization layer.

First claim

What is claimed is:

1. An organic light emitting display apparatus, comprising:
a substrate including a plurality of pixels having a plurality of sub-pixels;
a plurality of organic light emitting elements at the plurality of sub-pixels;
a plurality of light extraction patterns on the plurality of organic light emitting elements and having different size at each of the plurality of sub-pixels;
an encapsulation part on the plurality of organic light emitting elements; and
a planarization layer configured to planarize an upper portion of the encapsulation part,
wherein the plurality of light extraction patterns are on the planarization layer.

2. The organic light emitting display apparatus of claim 1 , wherein the encapsulation part includes a first encapsulation layer, a foreign material covering layer, and a second encapsulation layer.

3. The organic light emitting display apparatus of claim 1 , the plurality of organic light emitting elements includes at least two light emitting parts disposed on a first electrode.

4. The organic light emitting display apparatus of claim 1 , wherein the plurality of light extraction patterns have different shapes at each of the plurality of sub-pixels in a vertical cross-section of the organic light emitting display apparatus.

5. The organic light emitting display apparatus of claim 1 , wherein the plurality of light extraction patterns have different three-dimensional (3D) shapes.

6. The organic light emitting display apparatus of claim 1 , wherein each of the plurality of organic light emitting elements includes a white light emitting part, and
the white light emitting part includes a first light emitting part, a second light emitting part, and a third light emitting part.

7. The organic light emitting display apparatus of claim 6 , wherein the first light emitting part and the third light emitting part include a blue light emitting layer, and
the second light emitting part includes a red light emitting layer and two yellow-green light emitting layers.

8. The organic light emitting display apparatus of claim 7 , wherein each of the plurality of organic light emitting elements further includes a first electrode under the first light emitting part,
a thickness between an upper surface of the first electrode and a lower surface of the blue light emitting layer of the first light emitting part is approximately 220 Å to 620 Å,
a thickness between the upper surface of the first electrode and a lower surface of the red light emitting layer or the yellow-green light emitting layer of the second light emitting part is approximately 1740 Å to 2140 Å, and
a thickness between the upper surface of the first electrode and a lower surface of the blue light emitting layer of the third light emitting part is approximately 2730 Å to 3130 Å.

9. The organic light emitting display apparatus of claim 8 , wherein the plurality of sub-pixels includes a red sub-pixel, a green sub-pixel and a blue sub-pixel, and
the plurality of light extraction patterns have different aspect ratios in the red sub-pixel, the green sub-pixel, and the blue sub-pixel.

10. The organic light emitting display apparatus of claim 9 , wherein among the plurality of light extraction patterns, the aspect ratio of the light extraction pattern in the blue sub-pixel is less than the aspect ratio of the light extraction pattern in the green sub-pixel and is greater than the aspect ratio of the light extraction pattern in the red sub-pixel.

11. The organic light emitting display apparatus of claim 10 , wherein the aspect ratio of the light extraction pattern in the green sub-pixel is approximately 1.2, the aspect ratio of the light extraction pattern in the blue sub-pixel is approximately 1.1, and the aspect ratio of the light extraction pattern in the red sub-pixel is approximately 1.0.

12. The organic light emitting display apparatus of claim 1 , wherein the plurality of light extraction patterns directly contact the planarization layer.

13. The organic light emitting display apparatus of claim 1 , wherein the plurality of light extraction patterns overlap a plurality of color filters.

14. The organic light emitting display apparatus of claim 1 , wherein the organic light emitting display apparatus does not include a polarizing plate for preventing reflection of external light.

15. An organic light emitting display apparatus implemented not to include a polarizing plate, the organic light emitting display apparatus comprising:
a substrate on which a plurality of sub-pixels is disposed;
a plurality of organic light emitting elements on the substrate to correspond to the plurality of sub-pixels, respectively; and
a plurality of light extraction patterns disposed to have different width in each of the plurality of sub-pixels,
wherein the plurality of sub-pixels includes a green sub-pixel, a red sub-pixel and a blue sub-pixel, and
wherein each of the plurality of organic light emitting elements includes:
a first electrode;
a first light emitting part on the first electrode and including a blue light emitting layer;
a second light emitting part on the first light emitting part and including a red light emitting layer and two yellow-green light emitting layers;
a third light emitting part on the second light emitting part and including a blue light emitting layer; and
a second electrode on the third light emitting part.

16. The organic light emitting display apparatus of claim 15 , wherein an aspect ratio of the plurality of light extraction patterns is highest in the green sub-pixel among the plurality of sub-pixels.

17. The organic light emitting display apparatus of claim 16 , wherein an aspect ratio of the plurality of light extraction patterns is lowest in the red sub-pixel among the plurality of sub-pixels.

18. The organic light emitting display apparatus of claim 15 , wherein a thickness between an upper surface of the first electrode and a lower surface of the blue light emitting layer of the first light emitting part is approximately 220 Å to 620 Å,
a thickness between the upper surface of the first electrode and a lower surface of the red light emitting layer or the yellow-green light emitting layer of the second light emitting part is approximately 1740 Å to 2140 Å, and
a thickness between the upper surface of the first electrode and a lower surface of the blue light emitting layer of the third light emitting part is approximately 2730 Å to 3130 Å.

19. The organic light emitting display apparatus of claim 15 , further comprising:
an encapsulation part on the plurality of organic light emitting elements;
a plurality of color filters contacting an upper surface of the encapsulation part and disposed to correspond to the plurality of sub-pixels; and
a planarization layer disposed to surround the plurality of color filters,
wherein the plurality of light extraction patterns is disposed to contact an upper surface of the planarization layer.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Taemin
• Han Kyunghoon
• Koo Wonhoe

Classifications

• H10K59/875 Primary

  Arrangements for extracting light from the devices · CPC title

• H10K59/35

  comprising red-green-blue [RGB] subpixels · CPC title

• H10K59/12

  Active-matrix OLED [AMOLED] displays · CPC title

• H10K59/8731

  multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers · CPC title

• H10K59/353 Primary

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