Display device and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-11417636-B2
Application number	US-202017094630-A
Country	US
Kind code	B2
Filing date	Nov 10, 2020
Priority date	Jan 9, 2020
Publication date	Aug 16, 2022
Grant date	Aug 16, 2022

Abstract

A display device includes a substrate and a display element layer on the substrate. The display element layer includes: first and second electrodes extending along a first direction and spaced apart from each other in a second direction; and light emitting elements electrically connected to the first and second electrodes. The first electrode has a first convex portion convex toward the second electrode and a first concave portion concave in a direction away from the second electrode, and the second electrode has a second convex portion convex toward the first electrode and a second concave portion concave in a direction away from the first electrode. The light emitting elements includes a first and second light emitting elements, respectively close to the first concave portion and the second concave portion based on an imaginary extension line extending in the first direction between the first electrode and the second electrode.

First claim

What is claimed is:

1. A display device comprising:
a substrate; and
a display element layer on one surface of the substrate, the display element layer comprising:
first and second electrodes extending along a first direction and spaced apart from each other in a second direction different from the first direction; and
light emitting elements electrically connected to the first electrode and the second electrode,

wherein the first electrode has, in a plan view, a first convex portion convex toward the second electrode and a first concave portion concave in a direction away from the second electrode,
wherein the second electrode has, in the plan view, a second convex portion convex toward the first electrode and a second concave portion concave in a direction away from the first electrode, and
wherein the light emitting elements comprise, based on an imaginary extension line extending in the first direction between the first electrode and the second electrode, a first light emitting element close to the first concave portion, and a second light emitting element close to the second concave portion.

2. The display device of claim 1 , wherein the first concave portion and the second concave portion are alternately arranged along the first direction, and
wherein the first convex portion and the second convex portion are alternately arranged along the first direction.

3. The display device of claim 2 , wherein the first convex portion faces the second concave portion, and
wherein the second convex portion faces the first concave portion.

4. The display device of claim 3 , wherein the first light emitting element is between the first concave portion and the second convex portion, and
wherein the second light emitting element is between the second concave portion and the first convex portion.

5. The display device of claim 1 , wherein the display element layer further comprises:
a first contact electrode electrically connecting the first electrode to the light emitting elements, and
a second contact electrode electrically connecting the second electrode to the light emitting elements.

6. The display device of claim 5 , wherein an area at where the first contact electrode overlaps the first light emitting element is greater than an area at where the second contact electrode overlaps the first light emitting element.

7. The display device of claim 5 , wherein an area at where the first contact electrode overlaps the second light emitting element is smaller than an area at where the second contact electrode overlaps the second light emitting element.

8. The display device of claim 1 , wherein the display element layer further comprises a first bank and a second bank on the substrate, extending along the first direction, and spaced apart from each other along the second direction, and
wherein the first electrode is on the first bank, and the second electrode is on the second bank.

9. The display device of claim 8 , wherein the first bank has a first bank convex portion convex toward the second bank in the plan view and a first bank concave portion concave in a direction away from the second bank, and
wherein the second bank has a second bank convex portion convex toward the first bank in the plan view and a second bank concave portion concave in a direction away from the first bank.

10. The display device of claim 9 , wherein the first convex portion overlaps the first bank convex portion and has a shape corresponding to a planar shape of the first bank convex portion, and the first concave portion overlaps the first bank concave portion and has a shape corresponding to a planar shape of the first bank concave portion, and
wherein the second convex portion overlaps the second bank convex portion and has a shape corresponding to a planar shape of the second bank convex portion, and the second concave portion overlaps the second bank concave portion and has a shape corresponding to the planar shape of the second bank concave portion.

11. The display device of claim 8 , wherein the display element layer further comprises an insulating layer covering the first and second electrodes, and
wherein the light emitting elements are on the insulating layer.

12. The display device of claim 11 , wherein the insulating layer has an accommodating portion between the first electrode and the second electrode and recessed in a third direction toward the substrate, and
wherein the light emitting elements are on the accommodating portion of the insulating layer.

13. The display device of claim 12 , wherein a thickness of the insulating layer at the accommodation portion in the third direction is equal to or less than half the thicknesses of the first and second banks in the third direction.

14. The display device of claim 1 , wherein the second concave portion has a first sub concave portion alternately arranged with the first concave portion along the first direction and a second sub concave portion facing the first concave portion.

15. The display device of claim 14 , wherein the light emitting elements further comprise a third light emitting element between the first concave portion and the second sub concave portion.

16. The display device of claim 1 , wherein the first and second convex portions have a polygonal shape or a rounded curved shape.

17. The display device of claim 1 , wherein each of the first and second electrodes has at least two widths along the first direction.

18. The display device of claim 17 , wherein the first convex portion and the second convex portion have a non-square boundary.

19. The display device of claim 18 , wherein a region between the first electrode and the second electrode has a width that is not constant along the first direction.

20. A manufacturing method of a display device, the method comprising:
forming a first bank and a second bank on a substrate, the first bank and the second bank extending along a first direction and spaced apart from each other along a second direction different from the first direction;
forming a first electrode on the first bank and a second electrode on the second bank, the first electrode having, in a plan view, a first convex portion convex toward the second electrode and a first concave portion concave in a direction away from the second electrode, the second electrode having, in the plan view, a second convex portion convex toward the first electrode and a second concave portion concave in a direction away from the first electrode;
providing light emitting elements on the substrate after the forming of the first and second electrodes; and
arranging the light emitting elements between the first electrode and the second electrode by applying an alignment signal to the first and second electrodes, the arranged light emitting elements comprising a first light emitting element close to the first concave portion and a second light emitting element close to the second concave portion.

21. The manufacturing method of the display device of claim 20 , wherein the forming of the first bank and the second bank comprises:
forming, in the first bank, a first bank convex portion convex toward the second bank in the plan view and a first bank concave portion concave in a direction away from the second bank; and
forming, in the second bank, a second bank convex portion convex toward the first bank in the plan view and a second bank concave portion concave in a direction away from the first bank.

22. The manufacturing met

Assignees

• Samsung Display Co Ltd

Inventors

• Bae Su Bin
• Kim Seon Il
• Cho Sung Won
• Yeo Yun Jong
• Jeong Yu Gwang

Classifications

• H10W90/00 Primary

  Package configurations · CPC title

• H10H20/81

  Bodies · CPC title

• H10H20/01

  Manufacture or treatment · CPC title

• H10H29/142 Primary

  Two-dimensional arrangements, e.g. asymmetric LED layout · CPC title

• H10H20/0364

  of interconnections · CPC title