Light emitting element with a plurality of cells bonded, method of manufacturing the same, and light emitting device using the same
View Patent ↗The present invention relates to a light emitting element with arrayed cells, a method of manufacturing the same, and a light emitting device using the same. The present invention provides a light emitting element including a light emitting cell block with a plurality of light emitting cells connected in series or parallel on a single substrate, and a method of manufacturing the same, wherein each of the plurality of light emitting cells includes an N-type semiconductor layer and a P-type semiconductor layer, and the N-type semiconductor layer of one light emitting cell is electrically connected to the P-type semiconductor layer of another adjacent light emitting cell. Further, the present invention provides a light emitting device including a light emitting element with a plurality of light emitting cells connected in series. Accordingly, it is possible to simplify a manufacturing process of a light emitting device for illumination capable of being used with a household AC power source, to decrease a fraction defective occurring in manufacturing a light emitting device for illumination, and to mass-produce the light emitting device for illumination. Further, there is an advantage in that DC driving efficiency can be enhanced in an AC operation by installing a predetermined rectifying circuit outside the light emitting element.
1. A light emitting element, comprising:
a substrate;
a plurality of light emitting cells arranged on the substrate, each light emitting cell comprising an N-type semiconductor layer and a P-type semiconductor layer, the plurality of light emitting cells comprising:
a first light emitting cell block comprising a light emitting cell to emit light during both a forward bias cycle and a reverse bias cycle of an alternating current (AC) power source; and
a second light emitting cell block comprising:
a light emitting cell to emit light during only the forward bias cycle of the AC power source; and
a light emitting cell to emit light during only the reverse bias cycle of the AC power source.
2. The light emitting element of claim 1 , wherein the second light emitting cell block is connected to a first end and a second end of the first light emitting cell block.
3. The light emitting element of claim 2 , wherein:
the N-type semiconductor layer of the light emitting cell of the first light emitting cell block is coupled to the P-type semiconductor layer of the light emitting cell of the second light emitting cell block that emits light during the forward bias cycle of the AC power source; and
the N-type semiconductor layer of the light emitting cell of the first light emitting cell block is coupled to the P-type semiconductor layer of the light emitting cell of the second light emitting cell block that emits light during the reverse bias cycle of the AC power source.
4. The light emitting element of claim 3 , wherein:
the P-type semiconductor layer of the light emitting cell of the first light emitting cell block is coupled to the N-type semiconductor layer of the light emitting cell of the second light emitting cell block that emits light during the forward bias cycle of the AC power source; and
the P-type semiconductor layer of the light emitting cell of the first light emitting cell block is coupled to the N-type semiconductor layer of the light emitting cell of the second light emitting cell block that emits light during the reverse bias cycle of the AC power source.
5. The light emitting element of claim 4 , wherein:
the N-type semiconductor layer of the light emitting cell of the first light emitting cell block is coupled to the P-type semiconductor layer of the light emitting cell of the second light emitting cell block that emits light during the forward bias cycle of the AC power source using a step cover; and
the N-type semiconductor layer of the light emitting cell of the first light emitting cell block is coupled to the P-type semiconductor layer of the light emitting cell of the second light emitting cell block that emits light in the reverse bias cycle of the AC power source using a step cover.
6. The light emitting element of claim 5 , wherein:
the P-type semiconductor layer of the light emitting cell of the first light emitting cell block is coupled to the N-type semiconductor layer of the light emitting cell of the second light emitting cell block that emits light during the forward bias cycle of the AC power source using a step cover; and
the P-type semiconductor layer of the light emitting cell of the first light emitting cell block is coupled to the N-type semiconductor layer of the light emitting cell of the second light emitting cell block that emits light during the reverse bias cycle of the AC power source using a step cover.
7. The light emitting element of claim 1 , wherein the first light emitting cell block comprises an array comprising a plurality of light emitting cells connected in series.
8. The light emitting element of claim 1 , wherein the first light emitting cell block comprises two arrays, within each array a plurality of light emitting cells are connected in series, and the two arrays are connected in parallel with each other.
9. The light emitting element of claim 1 , further comprising a first electrode arranged on the substrate to supply external power.
10. The light emitting element of claim 9 , wherein the first electrode connects two light emitting cells adjacent to each other in reverse parallel.
11. The light emitting element of claim 1 , further comprising an external element.
12. The light emitting element of claim 9 , further comprising a second electrode coupled to an external element.
13. The light emitting element of claim 11 , wherein the external element comprises a control unit to control current and waveform.
14. The light emitting element of claim 12 , wherein the external element comprises a control unit to control current and waveform.
15. The light emitting element of claim 13 , wherein the control unit comprises an RC circuit.
16. The light emitting element of claim 14 , wherein the control unit comprises an RC circuit.
17. The light emitting element of claim 3 , wherein:
the N-type semiconductor layer of the light emitting cell of the first light emitting cell block is coupled to the P-type semiconductor layer of the light emitting cell of the second light emitting cell block that emits light during the forward bias cycle of the AC power source using an air bridge; and
the N-type semiconductor layer of the light emitting cell of the first light emitting cell block is coupled to the P-type semiconductor layer of the light emitting cell of the second light emitting cell block that emits light in the reverse bias cycle of the AC power source using an air bridge.
18. The light emitting element of claim 4 , wherein:
the N-type semiconductor layer of the light emitting cell of the first light emitting cell block is coupled to the P-type semiconductor layer of the light emitting cell of the second light emitting cell block that emits light during the forward bias cycle of the AC power source using an air bridge; and
the N-type semiconductor layer of the light emitting cell of the first light emitting cell block is coupled to the P-type semiconductor layer of the light emitting cell of the second light emitting cell block that emits light in the reverse bias cycle of the AC power source using an air bridge.