Light-emitting device and display device including rod shaped light emitting elements and color conversion elements

Patent metadata

Field	Value
Publication number	US-12155018-B2
Application number	US-201917422983-A
Country	US
Kind code	B2
Filing date	Jul 15, 2019
Priority date	Jan 15, 2019
Publication date	Nov 26, 2024
Grant date	Nov 26, 2024

Abstract

A light emitting device may include a substrate. A light emitting element layer may be disposed on the substrate and may include light emitting elements having a rod shape. A color conversion layer may be disposed on the light emitting element layer and may include color conversion elements having a rod shape. A first alignment direction of the light emitting elements and a second alignment direction of the color conversion elements may be substantially parallel to each other or intersect at a predetermined angle.

First claim

What is claimed is:

1. A light emitting device, comprising:
a substrate;
a light emitting element layer disposed on the substrate and including a plurality of light emitting elements having a rod shape; and
a color conversion layer disposed on the light emitting element layer and including a plurality of color conversion elements having a rod shape,
wherein a first alignment direction of the plurality of light emitting elements and a second alignment direction of the plurality of color conversion elements are substantially parallel to each other or intersect at a predetermined angle.

2. The light emitting device according to claim 1 , wherein each of the plurality of color conversion elements is a quantum rod.

3. The light emitting device according to claim 2 , wherein the quantum rod converts first monochromatic light emitted from the plurality of light emitting elements into second monochromatic light.

4. The light emitting device according to claim 2 , wherein the predetermined angle between the second alignment direction and the first alignment direction is about 30 or less degrees.

5. The light emitting device according to claim 4 , wherein
the first alignment direction is a direction in which ¾ or more of the plurality of light emitting elements are arranged, and
the second alignment direction is a direction in which ¾ or more of the plurality of color conversion elements are arranged.

6. The light emitting device according to claim 1 , wherein
the light emitting element layer further comprises:
a first electrode and a second electrode disposed on the substrate and spaced apart from each other; and
a first insulating layer disposed on the first and second electrodes and the substrate, and

the plurality of light emitting elements are disposed between the substrate and the first insulating layer and between the first electrode and the second electrode.

7. The light emitting device according to claim 6 , further comprising:
a common electrode layer disposed between the substrate and the light emitting element layer; and
a second insulating layer disposed between the common electrode layer and the light emitting element layer, wherein
the common electrode layer includes a first common electrode and a second common electrode disposed to be spaced apart from each other,
the first common electrode overlaps the first electrode and is electrically disconnected from the first electrode, and
the second common electrode overlaps the second electrode.

8. The light emitting device according to claim 7 , wherein
the plurality of light emitting elements are disposed between the first and second electrodes and the second insulating layer,
a first end of each of the plurality of light emitting elements are electrically connected to the first electrode, and
a second end of each of the plurality of light emitting elements are electrically connected to the second electrode.

9. The light emitting device according to claim 7 , wherein the plurality of color conversion elements are disposed between the first common electrode and the second common electrode in a plan view.

10. The light emitting device according to claim 1 , wherein
the substrate includes a first sub-pixel area, a second sub-pixel area, and a third sub-pixel area,
the plurality of light emitting elements emit light of a first color, and
the plurality of color conversion elements comprise:
a first color conversion element arranged in the second sub-pixel area and converting the light of the first color into light of a second color; and
a second color conversion element arranged in the third sub-pixel area and converting the light of the first color into light of a third color.

11. A display device, comprising:
a first substrate;
a light emitting element layer including a plurality of light emitting elements having a rod shape and disposed on the first substrate;
a color conversion layer including a plurality of color conversion elements having a rod shape and disposed on the light emitting element layer; and
a second substrate disposed on the color conversion layer,
wherein a first alignment direction of the plurality of light emitting elements and a second alignment direction of the plurality of color conversion elements are substantially parallel to each other.

12. The display device according to claim 11 , wherein
the light emitting element layer further includes a first electrode and a second electrode disposed on the first substrate and spaced apart from each other, and
the plurality of light emitting elements are disposed between the first electrode and the second electrode.

13. The display device according to claim 12 , further comprising:
a pixel circuit layer disposed between the first substrate and the light emitting element layer, the pixel circuit layer including a plurality of transistors and a power line, wherein
the first electrode is electrically connected to a first electrode of a first transistor of the plurality of transistors, through a first contact hole passing through at least a part of the pixel circuit layer, and
the second electrode is electrically connected to the power line through a second contact hole passing through at least a part of the pixel circuit layer.

14. The display device according to claim 13 , wherein
the light emitting element layer further comprises:
a first contact electrode electrically connecting a first end of each of the plurality of light emitting elements to the first electrode; and
a second contact electrode electrically connecting a second end of each of the plurality of light emitting elements to the second electrode, and the first contact electrode and the second contact electrode are disposed on a same layer.

15. The display device according to claim 14 , wherein the light emitting element layer further comprises:
a first bank pattern disposed between the first electrode and the pixel circuit layer; and
a second bank pattern disposed between the second electrode and the pixel circuit layer.

Assignees

• Samsung Display Co Ltd

Inventors

• Do Young Rag
• Eo Yun Jae

Classifications

• H10W90/22

  the stacked chips being on both top and bottom sides of a package substrate, interposer or RDL · CPC title

• H10W72/0198

  batch processes · CPC title

• H10W90/00

  Package configurations · CPC title

• H10H29/0364

  of interconnections · CPC title

• H10H29/0361

  of wavelength conversion means · CPC title