Display device using semiconductor light-emitting diodes, and manufacturing method therefor

Patent metadata

Field	Value
Publication number	US-10276632-B2
Application number	US-201515576186-A
Country	US
Kind code	B2
Filing date	Sep 2, 2015
Priority date	Jun 3, 2015
Publication date	Apr 30, 2019
Grant date	Apr 30, 2019

Abstract

The present invention relates to a display device and, particularly, to a display device using semiconductor light-emitting diodes. In the display device according to the present invention, at least one of the semiconductor light-emitting diodes comprises: a first conductive electrode and a second conductive electrode; a first conductive semiconductor layer having the first conductive electrode arranged thereon; a second conductive semiconductor layer overlapping with the first conductive semiconductor layer in a vertical direction, and having the second conductive electrode arranged thereon; and an active layer arranged between the first conductive semiconductor layer and the second conductive semiconductor layer, wherein a connecting unit electrically connected to the first conductive electrode is formed on one surface of the first conductive semiconductor layer, and the connecting unit is arranged so as to lean to one side on the basis of the second conductive electrode along the horizontal direction.

First claim

What is claimed is:

1. A display device having a plurality of semiconductor light-emitting diodes, wherein at least one of the semiconductor light-emitting diodes comprises:
a first conductive electrode and a second conductive electrode;
a first conductive semiconductor layer on which the first conductive electrode is disposed;
a second conductive semiconductor layer configured to overlap with the first conductive semiconductor layer in a vertical direction, on which the second conductive electrode is disposed; and
an active layer disposed between the first conductive semiconductor layer and the second conductive semiconductor layer,
wherein a connection portion electrically connected to the first conductive electrode is formed on one surface of the first conductive semiconductor layer, and the connection portion is disposed to be biased to one side with respect to the second conductive electrode along a horizontal direction,
wherein the display device has a front surface on which visual information is displayed, and
wherein the second conductive semiconductor layer is disposed closer to the front surface than the first conductive semiconductor layer.

2. The display device of claim 1 , wherein at least one of the semiconductor light-emitting diodes is configured to flow a current between the first conductive electrode and the second conductive electrode to a portion of the active layer facing the connection portion in a biased manner as the connecting portion is biased to one side.

3. The display device of claim 2 , wherein the portion of the active layer facing the connection portion is disposed in such a manner that the connection portion is adjacent to one side of at least one of the semiconductor light-emitting diodes, and the second conductive electrode is adjacent to the other side thereof not to overlap with the second conductive electrode.

4. The display device of claim 1 , wherein the first conductive semiconductor layer is formed with a current limiting portion that prevents current from flowing to the first conductive electrode.

5. The display device of claim 4 , wherein the current limiting portion is formed at a position that overlaps with the second conductive electrode in the vertical direction.

6. The display device of claim 5 , wherein the current limiting portion is configured to have a width equal to or greater than that of the second conductive electrode to completely cover the second conductive electrode in the vertical direction.

7. The display device of claim 4 , wherein a region covered by the first conductive electrode is formed on one surface of the first conductive semiconductor layer, and the connection portion and the current limiting portion are respectively positioned in the covering region.

8. The display device of claim 4 , wherein the current limiting portion includes a dielectric disposed between the first conductive electrode and the first conductive semiconductor layer.

9. The display device of claim 8 , wherein the dielectric is deposited on one surface of the first conductive semiconductor layer.

10. The display device of claim 8 , wherein the dielectric comprises SiO 2 or SiN.

11. The display device of claim 4 , wherein the current limiting portion is a portion in which at least part of one surface of the first conductive semiconductor layer is insulated by a plasma treatment.

12. The display device of claim 11 , wherein the first conductive semiconductor layer is a p-type GaN layer, and the current limiting portion is a defect that is plasma-treated on the p-type GaN layer to serve as an N-type donor.

13. The display device of claim 1 , wherein the first conductive electrode and the second conductive electrode are disposed so as not to overlap with each other along the vertical direction.

14. The display device of claim 1 , wherein a first region in which the connection portion is disposed and a second region that is electrically insulated between the first conductive electrodes are formed on one surface of the first conductive semiconductor layer.

15. A method of manufacturing a display device, the method comprising:
growing a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer on a substrate;
isolating semiconductor light-emitting diodes on the substrate through etching;
depositing a first conductive electrode on one surface of the first conductive semiconductor layer of the semiconductor light-emitting diodes; and
connecting the first conductive electrode to a wiring substrate and forming a second conductive electrode on the second conductive semiconductor layer,
wherein a connection portion electrically connected to the first conductive electrode is formed on one surface of the first conductive semiconductor layer, and the connection portion is disposed to be biased to one side with respect to the second conductive electrode along a horizontal direction,
wherein the display device has a front surface on which visual information is displayed, and
wherein the second conductive semiconductor layer is disposed closer to the front surface than the first conductive semiconductor layer.

16. The method of claim 15 , further comprising:
forming a current limiting portion that prevents current from flowing to the first conductive electrode on the first conductive semiconductor layer.

Assignees

• Lg Electronics Inc

Inventors

• Lee Eunah

Classifications

• H10W90/00 Primary

  Package configurations · CPC title

• Y02B20/48

  Cross-Sectional Technologies · mapped topic

• H01L27/156 Primary

  Electricity · mapped topic

• H01L33/005

  Electricity · mapped topic

• H01L33/36

  Electricity · mapped topic