Display device

Patent metadata

Field	Value
Publication number	US-12588325-B2
Application number	US-202117501466-A
Country	US
Kind code	B2
Filing date	Oct 14, 2021
Priority date	Nov 30, 2020
Publication date	Mar 24, 2026
Grant date	Mar 24, 2026

Abstract

A display device includes a first reflective electrode disposed on a surface of a substrate, a second reflective electrode spaced apart from the first reflective electrode and disposed on the surface of the substrate, and a light emitting element disposed between the first reflective electrode and the second reflective electrode. The first reflective electrode includes first surface irregularities disposed on a top surface of the first reflective electrode. The second reflective electrode includes second surface irregularities disposed on a top surface of the second reflective electrode.

First claim

What is claimed is:

1 . A display device comprising:
a first reflective electrode disposed on a surface of a substrate, and including first surface irregularities disposed on a top surface of the first reflective electrode; a second reflective electrode spaced apart from the first reflective electrode, disposed on the surface of the substrate, and including second surface irregularities disposed on a top surface of the second reflective electrode; a light emitting element disposed between the first reflective electrode and the second reflective electrode, a first contact electrode disposed on the first reflective electrode, a second contact electrode disposed on the second reflective electrode, a second insulating layer disposed on the first contact electrode and the second contact electrode, and covering the first contact electrode and the second contact electrode, and a filler disposed on the first and second contact electrodes, wherein the refractive index of the second insulating layer is smaller than the refractive index of the first contact electrode and smaller than the refractive index of the second contact electrode, wherein a refractive index of the filler is smaller than the refractive index of the first contact electrode and smaller than the refractive index of the second contact electrode, and wherein the refractive index of the filler is smaller than the refractive index of the second insulating layer.

2 . The display device of claim 1 , wherein each of the first reflective electrode and second reflective electrode comprises silver, aluminum, gold, platinum, palladium, indium, nickel, chrome, or an alloy thereof.

3 . The display device of claim 1 , wherein the first surface irregularities and the second surface irregularities have a same surface roughness.

4 . The display device of claim 1 , wherein the first surface irregularities and the second surface irregularities each have a random shape.

5 . The display device of claim 1 , wherein the first surface irregularities and the second surface irregularities are patterned to have a constant size.

6 . The display device of claim 5 , wherein a size of each of the first surface irregularities and the second surface irregularities is within a range of a wavelength band of light emitted from the light emitting element.

7 . The display device of claim 1 , further comprising:
a first sub-bank disposed on the surface of the substrate, and including a side surface facing a first end of the light emitting element, wherein the first reflective electrode is disposed on the first sub-bank, and the first surface irregularities are disposed in a region overlapping at least the side surface of the first sub-bank.

8 . The display device of claim 7 , further comprising:
a second sub-bank spaced apart from the first sub-bank, disposed on the surface of the substrate, and including a side surface facing a second end of the light emitting element, wherein the second reflective electrode is disposed on the second sub-bank, and including the second surface irregularities disposed in a region overlapping at least the side surface of the second sub-bank.

9 . The display device of claim 1 , further comprising:
a first insulating layer disposed on the first reflective electrode and the second reflective electrode, wherein the first insulating layer exposes at least a part of the first reflective electrode and at least a part of the second reflective electrode, and the light emitting element is disposed on the first insulating layer.

10 . The display device of claim 9 ,
wherein the first contact electrode electrically contacts the first reflective electrode exposed by the first insulating layer and electrically contacts a first end of the light emitting element; and the second contract electrode electrically contacts the second reflective electrode exposed by the first insulating layer and electrically contacts a second end of the light emitting element.

11 . The display device of claim 10 , wherein
the first contact electrode electrically connects the light emitting element and the first reflective electrode that are spaced apart from each other, and the second contact electrode electrically connects the light emitting element and the second reflective electrode that are spaced apart from each other.

12 . The display device of claim 10 , wherein the first contact electrode includes third surface irregularities that correspond to the first surface irregularities of the first reflective electrode and are disposed in a region where the first contact electrode contacts the first reflective electrode.

13 . A display device comprising:
a first electrode disposed on a substrate, and including surface irregularities disposed on a top surface of the first electrode; a second electrode spaced apart from the first electrode, disposed on the substrate, and including surface irregularities disposed on a top surface of the second electrode; a light emitting element disposed between the first electrode and the second electrode; a first contact electrode disposed on the first electrode, the first contact electrode electrically connecting the first electrode to a first end of the light emitting element; a second contact electrode disposed on the second electrode, the second contact electrode electrically connecting the second electrode to a second end of the light emitting element; an insulating layer disposed on the first contact electrode and the second contact electrode, and covering the first contact electrode and the second contact electrode, and a filler disposed on the first and second contact electrodes, wherein the refractive index of the insulating layer is smaller than the refractive index of the first contact electrode and smaller than the refractive index of the second contact electrode wherein a refractive index of the filler is smaller than the refractive index of the first contact electrode and smaller than the refractive index of the second contact electrode, and wherein the refractive index of the filler is smaller than the refractive index of the insulating layer.

14 . The display device of claim 13 , wherein each of the first electrode and the second electrode comprises silver, aluminum, gold, platinum, palladium, indium, nickel, chrome, or an alloy thereof.

15 . The display device of claim 13 , wherein the surface irregularities of the first electrode and the surface irregularities of the second electrode are patterned to have a constant size.

16 . The display device of claim 15 , wherein a size of each of the surface irregularities of the first electrode and the surface irregularities of the second electrode is within in a range of a wavelength band of light emitted from the light emitting element.

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Jong Won
• Yoo Je Won
• Cho Hyun Min
• Veidhes Basrur
• Kim Myeong Hee
• Shim Yong Sub

Classifications

• H10H29/142 Primary

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

• H10H20/835

  Reflective materials · CPC title

• H10W90/00 Primary

  Package configurations · CPC title

• H10H20/8312 Primary

  extending at least partially through the bodies · CPC title

• H10H20/857

  Interconnections, e.g. lead-frames, bond wires or solder balls · CPC title