Display device using semiconductor light-emitting elements, and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-12062734-B2
Application number	US-201917297874-A
Country	US
Kind code	B2
Filing date	Dec 6, 2019
Priority date	Dec 6, 2018
Publication date	Aug 13, 2024
Grant date	Aug 13, 2024

Abstract

Discussed is a display device and a method for manufacturing same, specifically, to a display device using semiconductor light-emitting elements of a few micrometers to tens of micrometers in size, and includes substrate having a wiring electrode, and a plurality of semiconductor light-emitting elements electrically connected to the wiring electrode, wherein each of the plurality of light-emitting elements includes of a buffer layer and an oxide layer formed on the buffer layer, and the oxide layer includes of an oxide of the buffer layer.

First claim

What is claimed is:

1. A display device, comprising:
a substrate having a wiring electrode; and
a plurality of semiconductor light-emitting elements electrically connected to the wiring electrode,
wherein each of the plurality of semiconductor light-emitting elements comprises:
a buffer layer;
an oxide layer formed on the buffer layer;
a first conductive semiconductor layer formed on the wiring electrode;
an active layer deposited on the first conductive semiconductor layer; and
a second conductive semiconductor layer deposited on the active layer,

wherein the oxide layer is made of an oxide of the buffer layer,
wherein the buffer layer is deposited on the second conductive semiconductor layer,
wherein the oxide layer is formed on a surface different from a surface in contact with the second conductive semiconductor layer among surfaces of the buffer layer,
wherein the buffer layer comprises a plurality of nanopores,
wherein the nanopores are formed on the surface in contact with the oxide layer among the surfaces of the buffer layer, and
wherein the oxide layer is formed on a surface of the buffer layer and on an inner wall of the plurality of nanopores.

2. The display device of claim 1 , wherein the oxide layer is made of any one of gallium oxide, silicon oxide, aluminum oxide, silicon carbide, and titanium oxide.

3. The display device of claim 1 , wherein a size of the plurality of nanopores is approximately 50 to 100 nm.

4. The display device of claim 1 , wherein the plurality of nanopores are formed with a depth of approximately 0.5 to 1 μm in a direction toward the second conductive semiconductor layer.

5. The display device of claim 1 , further comprising:
a light-transmitting layer disposed to cover the oxide layer,
wherein a refractive index of the oxide layer is between those of the light-transmitting layer and the second conductive semiconductor layer.

6. A method of manufacturing a display device, the method comprising:
forming a plurality of semiconductor light-emitting elements on a growth substrate;
forming a passivation layer on the plurality of semiconductor light-emitting elements;
bonding the plurality of semiconductor light-emitting elements of the growth substrate to a temporary substrate;
separating the plurality of semiconductor light-emitting elements from the growth substrate using a laser lift-off method; and
oxidizing a surface of the plurality of semiconductor light-emitting elements,
wherein each of the plurality of semiconductor light-emitting elements separated from the growth substrate has a buffer layer,
wherein the oxidizing of the surface of the plurality of semiconductor light-emitting elements oxidizes a surface of the buffer layer, and
wherein the surface of the buffer layer is oxidized using a light irradiated from a laser while the plurality of light-emitting elements are immersed in a solution.

7. The method of claim 6 , further comprising arranging the plurality of semiconductor light-emitting elements on a substrate of the display device,
wherein the substrate includes a wiring electrode to which the plurality of semiconductor light-emitting elements are electrically connected.

8. The method of claim 6 , wherein the oxidizing of the surface of the plurality of semiconductor light-emitting elements oxidizes the surface of the buffer layer to form a plurality of nanopores on a surface of the buffer layer.

9. The method of claim 6 , wherein the solution is one of a phosphoric acid solution or a potassium hydroxide solution.

10. The display device of claim 1 , wherein a portion of the buffer layer is interposed between inner walls of an adjacent pair of the plurality of nanopores.

11. The display device of claim 1 , wherein the oxide layer forms inner walls of the plurality of nanopores.

12. A display device, comprising:
a substrate having a wiring electrode; and
a plurality of semiconductor light-emitting elements electrically connected to the wiring electrode,
wherein each of the plurality of semiconductor light-emitting elements comprises:
a buffer layer; and
an auxiliary layer on the buffer layer,

wherein the auxiliary layer includes an oxide of the buffer layer,
wherein the auxiliary layer further includes a plurality of nanopores,
wherein the plurality of nanopores include sidewalls formed of the oxide of the buffer layer, and
wherein the auxiliary layer further includes a portion of the buffer layer, and the portion of the buffer layer is interposed between sidewalls of an adjacent pair of the plurality of nanopores.

13. The display device of claim 12 , wherein the buffer layer includes GaN, and the oxide is Ga 2 O 3 .

Assignees

• Lg Electronics Inc

Inventors

• Byun Yangwoo
• Song Hooyoung
• Lee Kyungho

Classifications

• H10W90/00

  Package configurations · CPC title

• H10P50/617 Primary

  of Group III-V materials · CPC title

• H10H29/034

  of coatings · CPC title

• H10H29/03

  using mass transfer of LEDs, e.g. by using liquid suspensions · CPC title

• H10H20/0364

  of interconnections · CPC title