Light emitting device
A light emitting device includes a substrate, a plurality of light emitting cells disposed on the substrate to be spaced apart from each other, and a connection wire electrically connecting adjacent ones of the light emitting cells. One of the adjacent light emitting cells includes a plurality of first segments, and the other of the adjacent light emitting cells includes a plurality of second segments respectively facing the first segments. A separation distance is provided between first and second segments facing each other, where each of which has an end contacting the connection wire is greater than a separation distance between first and second segments facing each other, and each of which has an end that does not contact the connection wire.
1. A light emitting device, comprising:
a substrate;
a plurality of light emitting cells arranged on the substrate to be spaced apart from each other; and
a connection wire configured to electrically connect the plurality of lighting cells which are disposed adjacent to each other,
wherein one of the plurality of light emitting cells comprises a plurality of first segments, and another one of the plurality of light emitting cells comprises a plurality of second segments respectively facing the first segments,
wherein the first segments comprise:
a 1-1 segment having an end plane contacting the connection wire; and
at least two 1-2 segments extending from both sides of the 1-1 segment, each of the at least two 1-2 segments having an end plane that does not contact the connection wire, and
the second segments comprise
a 2-1 segment having an end plane contacting the connection wire and facing the 1-1 segment; and
at least two 2-2 segments extending from both sides of the 2-1 segment, each of the at least two 2-2 segments having an end plane that does not contact the connection wire, and facing the 1-2 segment,
wherein a first separation distance between the 1-1 segment and the 2-1 segment facing each other is greater than a second separation distance between the 1-2 segment and the 2-2 segment,
wherein each of the end planes of the 1-2 segments facing the 2-2 segments protrudes more than the end plane of the 1-1 segment facing the 2-1 segment by a first protrusion length, and
wherein each of the end planes of the 2-2 segments facing the 1-2 segments protrudes more than the end plane of the 2-1 segment facing the 1-1 segment by a second protrusion length.
2. The light emitting device according to claim 1 , wherein the first protrusion length and the second protrusion length differ from each other.
3. The light emitting device according to claim 1 , wherein the 1-2 segment is disposed to extend from opposite sides of the 1-1 segment, and the 2-2 segment is disposed to extend from opposite sides of the 2-1 segment.
4. The light emitting device according to claim 1 , wherein the end plane of the 1-1 segment and the end plane of the 2-1 segment have the same width.
5. The light emitting device according to claim 1 , wherein the end plane of the 1-2 segment and the end plane of the 2-2 segment have the same width.
6. The light emitting device according to claim 1 , wherein each of the adjacent light emitting cells comprises:
a first conductive type semiconductor layer disposed on the substrate;
an active layer disposed on the first conductive type semiconductor layer; and
a second conductive type semiconductor layer disposed on the active layer.
7. The light emitting device according to claim 6 , wherein an end of the first conductive type semiconductor layer in the 1-1 segment contacts the connection wire, and an end of the second conductive type semiconductor layer in the 2-1 segment contacts the connection wire.
8. The light emitting device according to claim 1 , wherein the first separation distance between the respective end planes of the 1-1 segment and the 2-1 segment is between 10 μm and 55 μm.
9. The light emitting device according to claim 1 , wherein the second separation distance between the respective end planes of the 1-2 segment and the 2-2 segment is between 5 μm and 50 μm.
10. The light emitting device according to claim 1 , wherein the end plane of the 1-1 segment has a width of 5 μm to 8 μm.
11. The light emitting device according to claim 1 , wherein the end plane of the 2-1 segment has a width of 5 μm to 8 μm.
12. The light emitting device according to claim 1 , wherein a light emitting cell comprising the first segments and a light emitting cell comprising the second segments are adjacent each other in at least one of vertical or horizontal direction.
13. The light emitting device according to claim 1 , wherein the light emitting device has an increased light emitting region as shown in the following equation:
TPA =[( W 12×Δ L 1)×2+( W 22×Δ L 2)×2]×( M− 1)
wherein TPA denotes an increased area of the light emitting region, W 12 denotes a width of the end plane of the 1-2 segment, ΔL 1 denotes a first protrusion length by which the end plane of the 1-2 segment facing the 2-2 segment protrudes more than end plane of the 1-1 segment facing the 2-1 segment, W 22 denotes a width of the end plane of the 2-2 segment, ΔL 2 denotes a second protrusion length by which the end plane of the 2-2 segment facing the 1-2 segment protrudes more than the end plane of the 2-1 segment facing the 1-1 segment, and M denotes the number of the light emitting cells.