Light-emitting element and electronic device

Patent metadata

Field	Value
Publication number	US-12107189-B2
Application number	US-202117455708-A
Country	US
Kind code	B2
Filing date	Nov 19, 2021
Priority date	Nov 24, 2020
Publication date	Oct 1, 2024
Grant date	Oct 1, 2024

Abstract

According to one embodiment, a lighting-emitting element includes a light-emitting portion, a first terminal electrode and a second terminal electrode. The first terminal electrode includes a first cavity portion at a position overlapping a first connection electrode in planar view when the first terminal electrode is brought into contact with the first connection electrode. The second terminal electrode includes a second cavity portion at a position overlapping a second connection electrode in planar view when the second terminal electrode is brought into contact with the second connection electrode.

First claim

What is claimed is:

1. A light-emitting element to be mounted on a substrate on which a pair of a first connection electrode and a second connection electrode are formed, the light-emitting element comprising:
a light-emitting portion including a first main surface that emits light and a second main surface on an opposite side to the first main surface; and
a first terminal electrode and a second terminal electrode, provided on a second main surface side of the light-emitting portion,
the first terminal electrode including a first cavity portion at a position overlapping the first connection electrode in planar view when the first terminal electrode is brought into contact with the first connection electrode, and joined with the first connection electrode by a laser beam irradiated from the light-emitting portion side, and
the second terminal electrode including a second cavity portion at a position overlapping the second connection electrode in planar view when the second terminal electrode is brought into contact with the second connection electrode, and joined with the second connection electrode by the laser beam.

2. The light-emitting element of claim 1 , wherein
a height of the first terminal electrode is greater than that of the second terminal electrode, and
a height of the first cavity portion is greater than that of the second cavity portion.

3. The light-emitting element of claim 1 , further comprising:
an insulating layer provided to cover the second main surface of the light-emitting portion, wherein
the first terminal electrode is connected to the light-emitting portion via a first opening formed in the insulating layer,
the second terminal electrode is connected to the light-emitting portion via a second opening formed in the insulating layer,
the first cavity portion is provided at a position overlapping the first opening in planar view, and
the second cavity portion is provided at a position overlapping the second opening in planar view.

4. The light-emitting element of claim 3 , wherein
the first terminal electrode is connected to a portion of the second main surface of the light emitting portion, exposed by the first opening, and
the second terminal electrode is connected to a portion of the second main surface of the light-emitting portion, exposed by the second opening.

5. The light-emitting element of claim 4 , wherein
the first cavity portion is surrounded by the first terminal electrode, and
the second cavity is surrounded by the second terminal electrode.

6. The light-emitting element of claim 1 , further comprising:
an insulating layer provided to cover the second main surface of the light-emitting portion, wherein
the first terminal electrode is connected to the light-emitting portion via a first opening formed in the insulating layer,
the second terminal electrode is connected to the light-emitting portion via a second opening formed in the insulating layer,
the first cavity portion is provided at a position not overlapping the first opening in planar view, and
the second cavity is provided at a position not overlapping the second opening in planar view.

7. The light-emitting element of claim 6 , wherein
the second terminal electrode has a U-shape in planar view, and
the first terminal electrode has a shape in which the U-shape is reversed in planar view.

8. The light-emitting element of claim 6 , wherein
the first terminal electrode and the second terminal electrode both have an H-shape in planar view.

9. The light-emitting element of claim 6 , wherein
the first terminal electrode and the second terminal electrode both have a cross shape in planar view.

10. The light-emitting element of claim 6 , wherein
the first terminal electrode and the second terminal electrode both have a shape in which a plurality of electrodes are arranged in a matrix in planar view.

11. The light-emitting element of claim 1 , wherein
the first cavity portion and the second cavity portion have the same area in planar view.

12. The light-emitting element of claim 1 , wherein
the first cavity and the second cavity have areas different from each other in planar view.

13. The light-emitting element of claim 1 , wherein
the laser beam is transmitted through the light-emitting portion and the first cavity portion, and irradiated to a vicinity of a contact surface of the first terminal electrode and the first connection electrode, and
the laser beam is transmitted through the light-emitting portion and the second cavity, and irradiated in a vicinity of a contact surface of the second terminal electrode and the second connection electrode.

14. An electronic device comprising:
a substrate on which a pair of a first connection electrode and a second connection electrode are formed; and
a light-emitting element mounted on the substrate and electrically connected to the first connection electrode and the second connection electrode,
the light-emitting element comprising:
a light-emitting portion including a first main surface that emits light and a second main surface on an opposite side to the first main surface, and
a first terminal electrode and a second terminal electrode provided on a second main surface side of the light-emitting portion,
and
the first terminal electrode including a first cavity portion at a position where overlapping the first connection electrode in planar view when the first terminal electrode is brought into contact with the first connection electrode, and joined to the first connection electrode by a laser beam irradiated from the light-emitting portion side, and
the second terminal electrode including a second cavity portion at a position overlapping the second connection electrode in planar view when the second terminal electrode is brought into contact with the second connection electrode, and joined to the second connection electrode by the laser beam.

15. The electronic device of claim 14 , wherein
the light-emitting element further comprises an insulating layer provided to cover the second main surface of the light-emitting portion,
the first terminal electrode is connected to the light emitting portion via a first opening formed in the insulating layer,
the second terminal electrode is connected to the light-emitting portion via a second opening formed in the insulating layer,
the first cavity is provided at a position overlapping the first opening in planar view, and
the second cavity is provided at a position overlapping the second opening in planar view.

16. The electronic device of claim 14 , further comprising:
a first conductive connection member interposed between the first connection electrode and the light emitting portion, inside the first cavity portion; and
a second conductive connection member interposed between the second connection electrode and the light-emitting portion inside the second cavity portion.

17. The electronic device of claim 16 , wherein
the first conductive connection member is filled inside the first cavity portion,
the first conductive connection member is in contact with the first connection electrode and the second main surface of the light-emitting portion, inside the first cavity,
the second conductive connection member is filled inside the second cavity portion, and
the second conductive connection member is in contact with the second connection electrode and the second main surface of the light-emitting portion, inside the second cavity.

18. The electronic device of claim 16 , wherein
the first conductive conn

Assignees

• Japan Display Inc

Inventors

• Takemasa Kenichi
• Yamada Kazuyuki
• Asada Keisuke
• ISONO Daiki

Classifications

• H10H29/142

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

• H10H20/857

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

• H10H20/0364

  of interconnections · CPC title

• H10H20/032

  of electrodes · CPC title

• H10H20/84

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