Light emitting device package having improved electrical reliability and lighting apparatus including the package
Embodiments provide a light emitting device package including a substrate, a light emitting structure disposed under the substrate and including a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer, first and second electrodes connected to the first and second conductive semiconductor layers, a first pad connected to the first electrodes in first-first through-holes penetrating the second conductive semiconductor layer and the active layer, and a first insulation layer disposed between the first pad and the second conductive semiconductor layer and between the first pad and the active layer to cover the first electrodes in a first-second through-hole, and a second pad connected to the second electrode through a second through-hole penetrating the first insulation layer and electrically spaced apart from the first pad. The second pad does not overlap the first insulation layer in the first-second through-hole in a thickness direction of the light emitting structure.
1. A light emitting device package, comprising:
a substrate;
a light emitting structure disposed under the substrate, the light emitting structure including a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer;
a plurality of first through-holes penetrating the second conductive semiconductor layer and the active layer to expose the first conductive semiconductor layer;
a first electrode disposed in the plurality of first through-holes to be connected to the first conductive semiconductor layer;
a second electrode connected to the second conductive semiconductor layer;
a first pad connected to the first electrode in a plurality of first portions of the first through-holes;
an insulation layer disposed between the first pad and the second conductive semiconductor layer; and
a second pad connected to the second electrode through a second through-hole penetrating the insulation layer, the second pad being configured to be electrically spaced apart from the first pad,
wherein the second pad has a planar comb shape comprising a plurality of slits formed at one side of the second pad,
wherein the first electrode comprises;
a first portion contacting the first conductive semiconductor layer and vertically overlapping the first pad; and
a second portion connected to the first portion, while not vertically overlapping the first pad and the second pad, and arranged at one of the plurality of slits,
wherein the second pad is spaced apart from the second portion of the first electrode by a gap in a plane, the gap including;
a first distance formed in a first direction corresponding to a width direction of the one of the plurality of slits; and
a second distance formed in a second direction perpendicular to the first direction,
wherein the insulation layer covers the first electrodes in a second portion of the first through-holes, and
wherein the second pad does not overlap the insulation layer located in the second portions of the first through-holes in a thickness direction of the light emitting structure.
2. The package according to claim 1 , wherein the first pad includes a first cavity.
3. The package according to claim 2 , further comprising:
a first solder connected to the first pad; and
a second solder connected to the second pad.
4. The package according to claim 3 , wherein the first solder is embedded in the first cavity of the first pad.
5. The package according to claim 1 , wherein the first conductive semiconductor layer is an n-type semiconductor layer, and
wherein the second conductive semiconductor layer is a p-type semiconductor layer.
6. The package according to claim 1 , wherein the first portion of the first electrode is surrounded by the second electrode.
7. The package according to claim 1 , wherein the second portion of the first electrode includes a plurality of second portions, and
wherein the second through-hole is located between the second portions of the first electrode.
8. The package according to claim 1 , wherein each of the slits has a width equal to or greater than a width of the second portion of the first electrode.
9. The package according to claim 1 , wherein the second pad has a flat lower surface.
10. The package according to claim 1 , wherein the second electrode includes a reflective layer.
11. The package according to claim 1 , wherein the second pad is located near the second portion of the first electrode.
12. The package according to claim 1 , further comprising:
a body comprising a second cavity; and
a molding member disposed between the body and the substrate.
13. The package according to claim 1 , further comprising a phosphor disposed on the substrate.
14. The package according to claim 1 , wherein the number of the first through-holes is greater than the number of the second through-holes.
15. The package according to claim 1 , wherein a width of each of the slits is greater than a width of the second portion of the first electrode.
16. The package according to claim 1 , wherein the number of the first through-holes is greater than the number of the second through-holes.
17. The package according to claim 1 , wherein the first conductive semiconductor layer has stepped lower surfaces.
18. The package according to claim 1 , further comprising:
a first lead frame connected to the first solder; and
a second lead frame connected to the second solder.
19. The package according to claim 1 , wherein the first electrode has a strip shape in plan view.
20. A lighting apparatus including the light emitting device package according to claim 1 .