Display device

Patent metadata

Field	Value
Publication number	US-11798975-B2
Application number	US-202017108304-A
Country	US
Kind code	B2
Filing date	Dec 1, 2020
Priority date	Mar 30, 2018
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

A display device is capable of improving luminous efficiency and display quality and includes: a substrate; a thin film transistor on the substrate; a first electrode on the substrate and connected to the thin film transistor; a second electrode on the substrate and spaced apart from the first electrode; a plurality of light emitting elements between the first and second electrodes and electrically connected to each of the first and second electrodes; an insulating layer on the plurality of light emitting elements; and a reflective layer on the insulating layer. Each of the plurality of light emitting elements includes: a first semiconductor layer, an active layer on the first semiconductor layer, and a second semiconductor layer on the active layer.

First claim

What is claimed is:

1. A display device comprising:
a substrate;
a first electrode on the substrate;
a second electrode on the substrate and spaced apart from the first electrode on a same plane;
a plurality of light emitting elements on the substrate and electrically connected to each of the first and second electrodes;
an insulating layer comprising a first portion which surrounds an area in which the plurality of light emitting elements is disposed; and
a reflective layer on the insulating layer,
wherein each of the plurality of light emitting elements comprises a first semiconductor layer, an active layer on the first semiconductor layer, and a second semiconductor layer on the active layer,
the first semiconductor layer, the active layer, and the second semiconductor layer are sequentially disposed in a direction parallel to an upper surface of the substrate,
the display device further comprises:
a first contact electrode on a light emitting element of the plurality of light emitting elements and the second electrode, the first contact electrode directly contacting the light emitting element and the second electrode;
a second contact electrode on the first electrode and the light emitting element, the second contact electrode directly contacting the first electrode and the light emitting element; and
a second insulating layer on the light emitting element and the second electrode, and
the second insulating layer covers the first contact electrode.

2. The display device of claim 1 , wherein an outer surface of the first portion is inclined, and
the reflective layer has inclined surfaces disposed on the outer surface of the first portion, and the inclined surfaces are located opposing each other in a direction of a major axis of the light emitting element.

3. The display device of claim 1 , wherein the reflective layer covers an outer surface of the insulating layer.

4. The display device of claim 1 , further comprising a plurality of pixels on the substrate,
wherein the first portion of the insulating layer and at least a portion of the reflective layer are disposed between the pixels.

5. The display device of claim 1 , wherein the second electrode comprises two second electrodes spaced apart from each other with the first electrode therebetween.

6. The display device of claim 1 , further comprising a first insulating layer on a light emitting element of the plurality of light emitting elements,
wherein the first insulating layer exposes both of ends of the light emitting element.

7. The display device of claim 1 , wherein the light emitting element does not directly contact with the first and second electrodes.

8. The display device of claim 1 , wherein the first electrode and the second electrode are spaced apart from each other along a first direction parallel to the upper surface of the substrate, and
the plurality of light emitting elements is disposed along the first direction.

9. The display device of claim 1 , further comprising
light scattering particles disposed in the insulating layer.

10. The display device of claim 1 , further comprising a buffer layer between the substrate and the first and second electrodes.

11. A display device comprising:
a substrate;
a first electrode on the substrate;
a second electrode on the substrate and spaced apart from the first electrode on a same plane;
a plurality of light emitting elements on the substrate and electrically connected to each of the first and second electrodes;
an insulating layer comprising a first portion which surrounds an area in which the plurality of light emitting elements is disposed; and
light scattering particles in the insulating layer,
wherein each of the plurality of light emitting elements comprises a first semiconductor layer, an active layer on the first semiconductor layer, and a second semiconductor layer on the active layer,
the first semiconductor layer, the active layer, and the second semiconductor layer are sequentially disposed in a direction parallel to an upper surface of the substrate,
the display device further comprises:
a first contact electrode on a light emitting element of the plurality of light emitting elements and the second electrode, the first contact electrode directly contacting the light emitting element and the second electrode;
a second contact electrode on the first electrode and the light emitting element, the second contact electrode directly contacting the first electrode and the light emitting element; and
a second insulating layer on the light emitting element and the second electrode, and
the second insulating layer covers the first contact electrode.

12. The display device of claim 11 , wherein the light scattering particles have a refractive index different from a refractive index of the insulating layer.

13. The display device of claim 11 , further comprising a first insulating layer on a light emitting element of the plurality of light emitting elements,
wherein the first insulating layer exposes both of ends of the light emitting element.

14. The display device of claim 11 , wherein the light emitting element does not directly contact with the first and second electrodes.

15. The display device of claim 11 , further comprising a buffer layer between the substrate and the first and second electrodes.

Assignees

• Samsung Display Co Ltd

Inventors

• Cho Hyunmin
• Park Yonghan
• Kim Sungchul
• Chu Hyeyong
• Kim Daehyun
• Song Keunkyu
• Lee Jooyeol
• Lim Bekhyun

Classifications

• H10W90/00 Primary

  Package configurations · CPC title

• H10H20/882

  Scattering means (H10H20/82 takes precedence) · CPC title

• H10H20/857

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

• H10H20/856

  Reflecting means · CPC title

• H10H20/853

  characterised by their shape · CPC title