Display apparatus

Patent metadata

Field	Value
Publication number	US-9966553-B2
Application number	US-201715712889-A
Country	US
Kind code	B2
Filing date	Sep 22, 2017
Priority date	Sep 22, 2016
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

A display apparatus includes: a substrate; a first electrode; an insulating film including an opening that extends to at least the central portion of the first electrode; a light-emitting diode disposed on the first electrode and including a first pad electrically connected to the first electrode; a reflective film disposed on the insulating film so as to cover at least a portion of an inner surface of the opening; and a light path guide layer disposed on the insulating film so as to cover at least a portion of the reflective film and including a plurality of holes or a plurality of grooves on the top surface. In one embodiment, the display apparatus improves the light extraction efficiency of the light-emitting diode.

First claim

What is claimed is:

1. A display apparatus comprising:
a substrate;
a first electrode;
an insulating film comprising an opening that extend to at least a central portion of the first electrode;
a light-emitting diode disposed on the first electrode and comprising a first pad electrically connected to the first electrode;
a reflective film disposed on the insulating film so as to cover at least a portion of an inner surface of the opening; and
a light path guide layer disposed on the insulating film so as to cover at least a portion of the reflective film and comprising a plurality of holes or a plurality of grooves in a top surface thereof.

2. The display apparatus of claim 1 , further comprising a second electrode disposed on the light-emitting diode and electrically connected to a second pad of the light-emitting diode.

3. The display apparatus of claim 1 , wherein a cross-sectional area of a first portion of the opening toward the first electrode is smaller than a cross-sectional area of a second portion of the opening toward the second electrode.

4. The display apparatus of claim 3 , wherein the opening has a tapered portion between the first portion and the second portion.

5. The display apparatus of claim 1 , wherein the reflective film is disposed so as to surround the light-emitting diode.

6. The display apparatus of claim 5 , wherein the reflective film is configured to have a closed-loop-like shape.

7. The display apparatus of claim 1 , wherein the reflective film comprises any one of aluminum, molybdenum, titanium, titanium-tungsten, nickel, chromium, silver, gold, and alloys thereof.

8. The display apparatus of claim 1 , wherein the reflective film comprises a same material as the first electrode.

9. The display apparatus of claim 1 , wherein the portion of the reflective film covering the inner surface of the opening is located on a path along which light configured to be emitted from the light-emitting diode propagates.

10. The display apparatus of claim 1 , wherein the reflective film and the first electrode are integrally formed.

11. The display apparatus of claim 1 , wherein the light path guide layer comprises an organic material.

12. The display apparatus of claim 1 , wherein the light path guide layer comprises a light-transmissive material.

13. The display apparatus of claim 1 , wherein the plurality of holes or the plurality of grooves extend from the top surface of the light path guide layer toward underlying layers below the first electrode.

14. The display apparatus of claim 13 , wherein the plurality of holes penetrate completely through the light path guide layer.

15. The display apparatus of claim 1 , wherein the light path guide layer comprises a porous material.

16. The display apparatus of claim 1 , wherein a refractive index of a material filling the interior of the plurality of holes or the plurality of grooves is greater than a refractive index of a material included in the light path guide layer.

Assignees

• Samsung Display Co Ltd

Inventors

• Choi Manseob
• Park Sungkook
• Kim Minwoo
• Jo Mingyeong

Classifications

• H01L51/5203 Primary

  Electricity · mapped topic

• H01L51/5256

  Electricity · mapped topic

• H01L27/3248

  Electricity · mapped topic

• H01L51/5268

  Electricity · mapped topic

• H01L51/5284

  Electricity · mapped topic