Light emitting diode for AC operation
View Patent ↗The present invention discloses a light emitting diode (LED) including a plurality of light emitting cells arranged on a substrate. The LED includes half-wave light emitting units each including at least one light emitting cell, each half-wave light emitting unit including first and second terminals respectively arranged at both ends thereof; and full-wave light emitting units each including at least one light emitting cell, each full-wave light emitting units including third and fourth terminals respectively formed at both ends thereof. The third terminal of each full-wave light emitting unit is electrically connected to the second terminals of two half-wave light emitting units, and the fourth terminal of each full-wave light emitting unit is electrically connected to the first terminals of other two half-wave light emitting units. Also, a first half-wave light emitting unit is connected in series between the third terminal of a first full-wave light emitting unit and the fourth terminal of a second full-wave light emitting units, and a second half-wave light emitting units is connected in series between the fourth terminal of the first full-wave light emitting unit and the third terminal of the second full-wave light emitting unit.
1. A light emitting diode (LED), comprising:
a plurality of light emitting cells arranged on a substrate;
at least four half-wave light emitting units each comprising at least one light emitting cell, each half-wave light emitting unit comprising a first terminal and a second terminal respectively arranged at both ends thereof; and
at least two full-wave light emitting units each comprising at least one light emitting cell, each full-wave light emitting unit comprising a third terminal and a fourth terminal respectively arranged at both ends thereof,
wherein the third terminal of at least one full-wave light emitting unit is electrically connected to the second terminals of two half-wave light emitting units, and the fourth terminal of the at least one full-wave light emitting unit is electrically connected to the first terminals of other two half-wave light emitting units; and
wherein a first half-wave light emitting unit is connected in series between the third terminal of a first full-wave light emitting unit and the fourth terminal of a second full-wave light emitting unit, and a second half-wave light emitting unit is connected in series between the fourth terminal of the first full-wave light emitting unit and the third terminal of the second full-wave light emitting unit.
2. The LED of claim 1 , wherein the light emitting cells adjacent to the second terminals in two half-wave light emitting units share an electrode of same polarity with each other,
wherein the third terminal of at least one full-wave light emitting unit is electrically connected to the second terminals of the two half-wave light emitting units.
3. The LED of claim 2 , wherein the light emitting cells adjacent to the second terminals in the two half-wave light emitting units share a semiconductor layer of same polarity with each other, and the shared electrode is arranged on the shared semiconductor layer.
4. The LED of claim 2 , wherein the shared electrode is an n-electrode.
5. The LED of claim 2 , wherein the shared electrode is a p-electrode.
6. The LED of claim 1 , wherein each full-wave light emitting unit comprises a plurality of light emitting cells.
7. The LED of claim 1 , further comprising two bonding pads to receive power from an external power source, wherein each bonding pad is coupled to the first terminal of one half-wave light emitting unit and the second terminal of another half-wave light emitting unit.
8. The LED of claim 7 , wherein the two bonding pads are arranged on the substrate.
9. The LED of claim 8 , wherein the bonding pads and the plurality of light emitting cells together form an overall rectangular shape.
10. The LED of claim 1 , wherein the light emitting cell in one full-wave light emitting unit is larger in size than the light emitting cell in one half-wave light emitting unit.
11. The LED of claim 1 , wherein each light emitting cell comprises an n-electrode and a p-electrode, and at least one light emitting cell further comprises an n-electrode extension or a p-electrode extension.
12. The LED of claim 11 , wherein at least one light emitting cell comprises an n-electrode extension and a p-electrode extension, and the n-electrode extension and the p-electrode extension are symmetric.
13. The LED of claim 12 , wherein the n-electrode extension and the p-electrode extension are parallel.
14. The LED of claim 12 , wherein the n-electrode extension and the p-electrode extension are diagonally symmetric.
15. The LED of claim 12 , wherein each light emitting cell comprises an n-electrode extension and a p-electrode extension, and
wherein a distance between each n-electrode extension is substantially the same, and a distance between each p-electrode extension is substantially the same.
16. The LED of claim 11 , wherein at least one light emitting cell further comprises at least two n-electrode extensions and at least two p-electrode extensions, and
wherein the n-electrode extensions are symmetric with each other and the p-electrode extensions are symmetric with each other.
17. The LED of claim 16 , wherein the n-electrode extensions are parallel with corresponding p-electrode extensions.
18. The LED of claim 16 , wherein four half-wave light emitting units and two full-wave light emitting units form a six cell light emitting unit, and
wherein a plurality of six cell light emitting units are arranged on the substrate.
19. The LED of claim 1 , wherein four half-wave light emitting units and two full-wave light emitting units form a six cell light emitting unit, and
wherein a plurality of six cell light emitting units are arranged on the substrate.