Light emitting diode device and light emitting apparatus

Patent metadata

Field	Value
Publication number	US-12563869-B2
Application number	US-202217969077-A
Country	US
Kind code	B2
Filing date	Oct 19, 2022
Priority date	Nov 23, 2021
Publication date	Feb 24, 2026
Grant date	Feb 24, 2026

Abstract

A light emitting diode device includes an epitaxial layered structure and first and second electrodes that are disposed on the epitaxial layered structure. The second electrode includes a body portion and at least one extending portion connected to the body portion and extending in a direction away from the body portion. The extending portion includes at least one curved section. A projection of the curved section on the epitaxial layered structure includes first and second curved sides that are opposite to each other and that are curved in an identical direction. The first curved side has a first imaginary center of curvature, and the second curved side has a second imaginary center of curvature. A distance between the first imaginary center of curvature and the second imaginary center of curvature is equal to or smaller than 5 μm.

First claim

What is claimed is:

1 . A light emitting diode (LED) device, comprising:
an epitaxial layered structure that includes a first semiconductor layer, a light emitting layer and a second semiconductor layer sequentially disposed in such order; a first electrode that is disposed on said epitaxial layered structure and that is electrically connected to said first semiconductor layer; a second electrode that is disposed on said epitaxial layered structure, that is electrically connected to said second semiconductor layer, and that includes a body portion and at least one extending portion connected to said body portion and extending in a direction away from said body portion, said extending portion including at least one curved section, wherein a projection of said curved section on said epitaxial layered structure includes a first curved side and a second curved side that are opposite to each other and that are curved in an identical direction, said first curved side having a first imaginary center of curvature and a first radius of curvature, said second curved side having a second imaginary center of curvature and a second radius of curvature that is larger than the first radius of curvature, and a distance between the first imaginary center of curvature and the second imaginary center of curvature is equal to or smaller than 5 μm.

2 . The LED device as claimed in claim 1 , wherein the distance between the first imaginary center of curvature and the second imaginary center of curvature is equal to or greater than 1 μm.

3 . The LED device as claimed in claim 1 , wherein said first curved side is a part of a first imaginary circle and said second curved side is a part of a second imaginary circle, and wherein the first imaginary center of curvature and the second imaginary center of curvature coincide with centers of the first imaginary to circle and the second imaginary circle, respectively.

4 . The LED device as claimed in claim 3 , wherein said first curved side has an arc length equal to or smaller than one fourth of a circumference of the first imaginary circle, and said second curved side has an arc length equal to or smaller than one fourth of a circumference of the second imaginary circle.

5 . The LED device as claimed in claim 3 , wherein the first imaginary circle is internally tangent to the second imaginary circle.

6 . The LED device as claimed in claim 5 , wherein:
a point of tangency between the first imaginary circle and the second imaginary circle is defined as a first point, and a point on the second imaginary circle that is farthest from the first point is defined as a second point, and a first straight line connects the first point and the second point, and a second straight line perpendicular to the first straight line and passing through the second point passes through a geometric center of a projection of said body portion on said epitaxial layered structure.

7 . The LED device as claimed in claim 6 , wherein a proportion of an arc length of said first curved side to a circumference of the first imaginary circle is smaller than a proportion of an arc length of said second curved side to a circumference of the second imaginary circle.

8 . The LED device as claimed in claim 6 , wherein the centers of the first imaginary circle and the second imaginary circle and the geometric center of said projection of said body portion are collinear.

9 . The LED device as claimed in claim 5 , wherein:
a point of tangency between the first imaginary circle and the second imaginary circle is defined as a first point, a point on the second imaginary circle that is farthest from the first point is defined as a second point, and a point on the first imaginary circle that is farthest from the first point is defined as a third point, and a third straight line connects the second point and the third point, and a fourth straight line perpendicular to the third straight line passing through a center of the third straight line passes through a geometric center of a projection of said body portion on said epitaxial layered structure.

10 . The LED device as claimed in claim 1 , wherein said extending portion further includes a straight section that connects to said curved section and a connecting section that connects said body portion and said curved section.

11 . The LED device as claimed in claim 10 , wherein a projection of said straight section on said epitaxial layered structure has a width that is equal to or smaller than a width of said projection of said curved section on said epitaxial layered structure.

12 . The LED device as claimed in claim 10 , wherein a projection of said straight section on said epitaxial layered structure has a width ranging from 2 μm to 4 μm.

13 . The LED device as claimed in claim 10 , wherein a difference between the first radius of curvature and the second radius of curvature is equal to a width of a projection of said straight section on said epitaxial layered structure.

14 . The LED device as claimed in claim 10 , wherein a projection of said connecting section on said epitaxial layered structure has a width that is equal to or greater than a width of said projection of said curved section on said epitaxial layered structure, and includes:
a first connecting side that is connected to said first curved side and that has a third radius of curvature, and a second connecting side that is connected to said second curved side and that has a fourth radius of curvature; and said first connecting side and said second connecting side are curved in opposite directions, and the third radius of curvature and the fourth radius of curvature are smaller than the first radius of curvature.

15 . The LED device as claimed in claim 10 , wherein a distance from a first connecting point that interconnects a projection of said straight section on said epitaxial layered structure and said first curved side to a second connecting point that interconnects said projection of said straight section and said second curved side is a minimum width of said projection of said curved section on said epitaxial layered structure.

16 . The LED device as claimed in claim 10 , wherein a distance from a third connecting point that interconnects a projection of said connecting section on said epitaxial layered structure and said first curved side to a fourth connecting point that interconnects said projection of said connecting section and said second curved side is two times a width of said projection of said straight section on said epitaxial layered structure.

17 . The LED device as claimed in claim 10 , wherein a projection of said curved section on said epitaxial layered structure has a width that gradually decreases in an extending direction from said connecting section toward said straight direction.

18 . The LED device as claimed in claim 10 , wherein a projection of said curved section on said epitaxial layered structure as a width that is equal to or greater than a width of a projection of said straight section on said epitaxial layered structure and that is equal to or smaller than two times a width of said projection of said straight section on said epitaxial layered structure.

19 . The LED device as claimed in claim 1 , wherein the first imaginary center of curvature of said first curved side coincides with the second imaginary center of curvature of said second curved side.

20 . A light emitting apparatus comprising the LED device of claim 1 .

Assignees

• Quanzhou Sanan Semiconductor Tech Co Ltd

Inventors

• Cao Linhua
• Chen Wanjun
• Wang Huining
• Tang Heying
• He Chunlan
• Jiang Lili
• Zhang Liming
• Yang Renlong
• Chang Chung-Ying

Classifications

• H10H20/841

  Reflective coatings, e.g. dielectric Bragg reflectors · CPC title

• H10H20/821

  of the light-emitting regions, e.g. non-planar junctions · CPC title

• H10H20/032

  of electrodes · CPC title

• H10H20/84

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

• H10H20/833

  Transparent materials · CPC title