Electrode assembly having lower electrode directly on the surface of a base substrate, a first electrode on the lower electrode, and the second electrode formed on and spaced apart from the first electrode

Patent metadata

Field	Value
Publication number	US-11855239-B2
Application number	US-202117216631-A
Country	US
Kind code	B2
Filing date	Mar 29, 2021
Priority date	Nov 18, 2014
Publication date	Dec 26, 2023
Grant date	Dec 26, 2023

Abstract

The present invention relates to an electrode assembly comprising nano-scale-LED elements and a method for manufacturing the same and, more specifically, to an electrode assembly comprising nano-scale-LED elements and a method for manufacturing the same, in which the number of nano-scale-LED elements included in a unit area of the electrode assembly is increased, the light extraction efficiency of individual nano-scale-LED elements is increased so as to maximize light intensity per unit area, and at the same time, nano-scale-LED elements on a nanoscale are connected to an electrode without a fault such as an electrical short circuit.

First claim

What is claimed is:

1. A display device comprising:
a substrate;
a lower electrode on the substrate;
a first layer on the lower electrode and the substrate;
a plurality of light emitting elements on the first layer and spaced from each other;
a plurality of first electrodes on the first layer, the first electrodes extending in a first direction and spaced from each other; and
a second electrode on the first layer and spaced from the first electrodes,
wherein the second electrode comprises a first portion extending in the first direction between the first electrodes, a second portion extending in the first direction and space from the first portion with at least one of the first electrodes therebetween, and a third portion extending in a second direction and connecting the first portion and the second portion, and
a first end portion of at least one of the light emitting elements contacts the first electrode, and
a second end portion of the at least one of the light emitting elements contacts the first portion or the second portion of the second electrode.

2. The display device of claim 1 , wherein at least one of the light emitting elements comprises:
a first semiconductor layer;
an active layer on the first semiconductor layer;
a second semiconductor layer on the active layer; and

a first insulating film covering at least an outer surface of the active layer from among outer surfaces of the light emitting elements.

3. The display device of claim 2 , wherein the plurality of light emitting elements comprises:
a third light emitting element of which the first end portion comprises an end portion of the first semiconductor layer, and
a fourth light emitting element of which the second end portion comprises an end portion of the first semiconductor layer.

4. The display device of claim 3 , wherein at least one of the light emitting elements further comprises an electrode layer on the second semiconductor layer,
wherein the electrode layer of the third light emitting element contacts the second electrode, and
the electrode layer of the fourth light emitting element contacts at least one of the first electrodes.

5. The display device of claim 2 , wherein the plurality of light emitting elements comprises:
a first light emitting element located between one of the first electrodes and the first portion of the second electrode, and
a second light emitting element located between another of the first electrodes and the second portion of the second electrode.

6. The display device of claim 2 , wherein at least one of the light emitting elements further comprises a second insulating film covering the first insulating film.

7. The display device of claim 1 , wherein at least one of the first electrodes electrically contacts the lower electrode through a contact hole formed at the first layer.

8. The display device of claim 7 , wherein the contact hole is located at a first area that is an outer region of a second region where the plurality of light emitting elements is located.

9. The display device of claim 7 , wherein the lower electrode extends in the second direction.

10. The display device of claim 1 , wherein the second electrode further comprises:
a fourth portion extending in the first direction between the first electrodes,
a fifth portion extending in the first direction and spaced from one of the first electrodes in the first direction, and
a sixth portion extending in the second direction and connecting the fourth portion and the fifth portion.

11. A display device comprising:
a substrate;
a lower electrode on the substrate;
a first layer on the lower electrode and the substrate;
a plurality of light emitting elements on the first layer and spaced from each other;
a first electrode on the first layer; and
a second electrode on the first layer and spaced from the first electrode,
wherein a first end portion of at least one of the light emitting elements contacts the first electrode, and a second end portion of at least one of the light emitting elements contacts the second electrode, and
a distance between at least one of the light emitting elements and the first layer is smaller than a distance between an upper surface of the first and second electrodes and the first layer.

12. The display device of claim 11 , wherein at least one of the light emitting elements comprises:
a first semiconductor layer;
an active layer on the first semiconductor layer;
a second semiconductor layer on the active layer;
an electrode layer on the second semiconductor layer; and
a first insulating film covering at least an outer surface of the active layer from among outer surfaces of the light emitting elements.

13. The display device of claim 12 , wherein at least one of the light emitting elements further comprises a second insulating film covering the first insulating film.

14. The display device of claim 11 , wherein the first electrode and the second electrode comprise a first surface that is a contact surface between the first electrode or the second electrode and the first layer and a second surface that is a contact surface with at least one of the light emitting elements, and
wherein the first surface is not parallel with the second surface.

15. The display device of claim 11 , wherein the plurality of light emitting elements comprises a first light emitting element and a second light emitting element, and
a first distance between a farthest point and a closest point of the first light emitting element from a base substrate is different from a second distance between a farthest point and a closest point of the second light emitting element from the base substrate.

Assignees

• Samsung Display Co Ltd

Inventors

• Sung Yeon Goog

Classifications

• H10H20/84

  Coatings, e.g. passivation layers or antireflective coatings · CPC title

• H10H20/831

  characterised by their shape · CPC title

• H10H20/83 Primary

  Electrodes · CPC title

• H10H20/032

  of electrodes · CPC title

• H10H20/8316

  Multi-layer electrodes comprising at least one discontinuous layer · CPC title