Light-emitting diode device

Patent metadata

Field	Value
Publication number	US-10505092-B2
Application number	US-201815874501-A
Country	US
Kind code	B2
Filing date	Jan 18, 2018
Priority date	Jan 24, 2017
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

A light-emitting element, includes a first edge, a second edge, a third edge and a fourth edge; a substrate; a semiconductor stack formed on the substrate, including a first semiconductor layer, a second semiconductor layer and an active layer formed therebetween; a transparent conductive layer, formed on the second semiconductor layer; a first electrode formed on the first semiconductor layer, including a first pad electrode and a first finger electrode extending from the first pad electrode; and a second electrode formed on the first second semiconductor layer, including a second pad electrode and a second finger electrode extending from the second pad electrode; wherein the first finger electrode is disposed at and along the first edge; and wherein in top view, an overlapping portions of the first finger electrode and the second finger electrode are non-parallel.

First claim

What is claimed is:

1. A light-emitting device, comprising:
a first edge, a second edge, a third edge and a fourth edge, wherein the first edge and the third edge are opposite each other, and the second edge and the fourth edge are opposite each other;
a substrate;
a semiconductor stack formed on the substrate, comprising a first semiconductor layer, a second semiconductor layer and an active layer formed therebetween;
a transparent conductive layer, formed on the second semiconductor layer;
a first electrode formed on the first semiconductor layer, comprising a first pad electrode and a first finger electrode extending from the first pad electrode; and
a second electrode formed on the second semiconductor layer, comprising a second pad electrode and a second finger electrode extending from the second pad electrode,
wherein the first finger electrode is disposed at and along the first edge; and
wherein in a top view, the first finger electrode comprises a first overlapping portion overlapping the second finger electrode;
the second finger electrode comprises a second overlapping portion overlapping the first finger electrode and a non-overlapping portion that does not overlap the first finger electrode; and
the second overlapping portion comprises a non-parallel portion that is not parallel to the first overlapping portion, and a length of the non-parallel portion is greater than that of the non-overlapping portion.

2. The light-emitting device according to claim 1 , wherein the semiconductor stack further comprises an exposed region, extending from a top surface of the second semiconductor layer downward to the first semiconductor layer and exposing a top surface of the first semiconductor layer, and the first electrode is formed on the exposed region.

3. The light-emitting device according to claim 1 , wherein the first edge and the third edge are longer than the second edge and the fourth edge, and the first finger electrode and the second finger electrode extend toward the fourth edge and the second edge, respectively.

4. The light-emitting device according to claim 1 , wherein a distance between the first finger electrode and the second finger electrode increases as a distance that the second finger electrode extends far away from the second pad electrode.

5. The light-emitting device according to claim 1 , wherein the second finger electrode comprises a curve.

6. The light-emitting device according to claim 1 , wherein a shortest distance between the first finger electrode and an end of the second finger electrode is larger than half a length of the second edge.

7. The light-emitting device according to claim 1 , wherein a shortest distance between the first finger electrode and an end of the second finger electrode is larger than a shortest distance between the second finger electrode and an end of the first finger electrode.

8. The light-emitting device according to claim 1 , further comprising a current blocking region between the first electrode and the first semiconductor layer.

9. The light-emitting device according to claim 8 , wherein the current blocking region comprises a plurality of separated islands under the first finger electrode.

10. The light-emitting device according to claim 1 , wherein the first edge and the third edge are longer than the second edge and the fourth edge, and the first pad electrode and the second pad electrode are disposed in regions adjacent to the second edge and the fourth edge, respectively.

11. The light-emitting device according to claim 1 , wherein:
in a top view, the second semiconductor layer comprises a contour, and the contour comprises a first sub-contour adjacent to and parallel with the first finger electrode and a second sub-contour connecting to the first sub-contour and adjacent to the first edge;
wherein a top surface of the second semiconductor layer comprises an area which protrudes from a pseudo extending line of the first sub-contour and is enclosed by the second sub-contour,

wherein the pseudo extending line intersects the fourth edge; and
the area is not covered by the transparent conductive layer.

12. The light-emitting device according to claim 11 , wherein a distance between the transparent conductive layer and the first sub-contour is smaller than a distance between the transparent conductive layer and the second sub-contour.

13. The light-emitting device according to claim 11 , wherein the pseudo extending line of the first sub-contour is between the first edge and the transparent conductive layer.

14. The light-emitting device according to claim 1 , wherein:
in a top view,
the second semiconductor layer comprises a contour, and the contour comprises a first sub-contour adjacent to and parallel with the first finger electrode and a second sub-contour connecting to the first sub-contour and adjacent to the first edge;
wherein a distance between the transparent conductive layer and the first sub-contour is smaller than a distance between the transparent conductive layer and the second sub-contour.

15. The light-emitting device according to claim 1 , wherein the second pad electrode is disposed on a midline of the fourth edge.

16. The light-emitting device according to claim 1 , wherein the first pad electrode is disposed at the second edge and the first finger electrode extends along the second edge and the first edge.

17. The light-emitting device according to claim 1 , wherein the transparent conductive layer comprises an opening corresponding to a location of the second pad electrode and a width of the opening is larger than that of the second pad electrode.

18. The light-emitting device according to claim 17 , further comprising a current blocking region under the second pad electrode.

19. The light-emitting device according to claim 1 ,
wherein the first edge and the third edge are longer than the second edge and the fourth edge, and the first finger electrode and the second finger electrode extend toward the fourth edge and the second edge, respectively;
wherein in a top view,
an area of the second semiconductor layer between the fourth edge and an end of the first finger electrode is not covered by the transparent conductive layer so that the transparent conductive layer does not overlap with the first finger electrode in a direction parallel with the first edge.

20. The light-emitting device according to claim 19 , wherein a contour of the transparent conductive layer is not disposed conformably along a contour of the second semiconductor layer.

Assignees

• Epistar Corp

Inventors

• Chang li-ming
• Yeh Tzung-Shiun
• Shen Chien-Fu
• Lin Yu-Rui
• Ou Chen
• Wang Hsin-Ying
• Yeh Hui-Chun

Classifications

• H10W42/60

  protecting against electrostatic charges or discharges, e.g. Faraday shields (integrated devices comprising arrangements for electrical protection H10D89/60) · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21K9/232

  specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb · CPC title

• H01L33/20

  Electricity · mapped topic

• H01L33/14

  Electricity · mapped topic