Distributed current blocking structures for light emitting diodes
First Claim
1. A Light Emitting Diode (LED) comprising:
- a strip-shaped electrode, wherein current flow through the strip-shaped electrode causes light to be emitted from the LED;
a strip-shaped current blocking structure disposed directly underneath the strip-shaped electrode, wherein the strip-shaped current blocking structure extends in a first direction, wherein a first square area A, a second square area B, and a third square area C abut one another and extend in the order A, B, C in a row in a second direction perpendicular to the first direction and away from the strip-shaped current blocking structure, wherein each of A, B and C is a square area of 400 square microns; and
a plurality of current blocking structures, wherein at least a first one of the plurality of current blocking structures covers at least part of A, wherein at least a second one of the plurality of current blocking structures covers at least part of B, wherein at least a third one of the plurality of current blocking structures covers at least part of C, wherein the plurality of current blocking structures covers X percent of A, covers Y percent of B, and covers Z percent of C, and wherein X>
Z.
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Accused Products
Abstract
An LED device includes a strip-shaped electrode, a strip-shaped current blocking structure and a plurality of distributed current blocking structures. The current blocking structures are formed of an insulating material such as silicon dioxide. The strip-shaped current blocking structure is located directly underneath the strip-shaped electrode. The plurality of current blocking structures may be disc shaped portions disposed in rows adjacent the strip-shaped current blocking structure. Distribution of the current blocking structures is such that current is prevented from concentrating in regions immediately adjacent the electrode, thereby facilitating uniform current flow into the active layer and facilitating uniform light generation in areas not underneath the electrode. In another aspect, current blocking structures are created by damaging regions of a p-GaN layer to form resistive regions. In yet another aspect, current blocking structures are created by etching away highly doped contact regions to form regions of resistive contact between conductive layers.
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Citations
19 Claims
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1. A Light Emitting Diode (LED) comprising:
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a strip-shaped electrode, wherein current flow through the strip-shaped electrode causes light to be emitted from the LED; a strip-shaped current blocking structure disposed directly underneath the strip-shaped electrode, wherein the strip-shaped current blocking structure extends in a first direction, wherein a first square area A, a second square area B, and a third square area C abut one another and extend in the order A, B, C in a row in a second direction perpendicular to the first direction and away from the strip-shaped current blocking structure, wherein each of A, B and C is a square area of 400 square microns; and a plurality of current blocking structures, wherein at least a first one of the plurality of current blocking structures covers at least part of A, wherein at least a second one of the plurality of current blocking structures covers at least part of B, wherein at least a third one of the plurality of current blocking structures covers at least part of C, wherein the plurality of current blocking structures covers X percent of A, covers Y percent of B, and covers Z percent of C, and wherein X>
Z. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of manufacturing a Light Emitting Diode (LED) comprising:
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forming a strip-shaped current blocking structure, wherein the strip-shaped current blocking structure extends in a first direction, wherein a first square area A, a second square area B, and a third square area C abut one another and extend in the order A, B, C in a row in a second direction perpendicular to the first direction and away from the strip-shaped current blocking structure, wherein each of A, B and C is a square area of 400 square microns; and forming a plurality of current blocking structures, wherein at least a first one of the plurality of current blocking structures covers at least part of A, wherein at least a second one of the plurality of current blocking structures covers at least part of B, wherein at least a third one of the plurality of current blocking structures covers at least part of C, wherein the plurality of current blocking structure covers X percent of A, covers Y percent of B, and covers Z percent of C, and wherein X>
Z; andforming a strip-shaped electrode so that the strip-shaped electrode is disposed directly above the strip-shaped current blocking structure, wherein current flow through the strip-shaped electrode causes light to be emitted from the LED.
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16. A Light Emitting Diode (LED) comprising:
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a strip-shaped electrode, wherein current flow through the strip-shaped electrode causes light to be emitted from the LED; a strip-shaped current blocking structure disposed directly underneath the strip-shaped electrode, wherein the strip-shaped current blocking structure extends in a first direction, wherein a first square area A, a second square area B, and a third square area C abut one another and extend in the order A, B, C in a row in a second direction perpendicular to the first direction and away from the strip-shaped current blocking structure, wherein each of A, B and C is a square area of 400 square microns; and means for blocking current flow in selected areas of A, B and C such that a first current flow through A is substantially equal to a second current flow through B and such that the second current flow through B is substantially equal to a third current flow through C. - View Dependent Claims (17, 18)
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19. Light Emitting Diode (LED) comprising:
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a strip-shaped electrode, wherein a current flow through the strip-shaped electrode causes light to be emitted from the LED; an active layer, wherein a portion of the active layer is disposed under the strip-shaped electrode; and a current blocking layer comprising a plurality of portions, wherein each portion of the current blocking layer has a porosity and partially covers a corresponding portion of a surface, wherein the porosity of a portion of the current blocking layer is a percentage of the corresponding portion of the surface that is not covered by the current blocking layer, wherein the porosity varies across the current blocking layer from portion to portion such that the current flow flows through the current blocking layer and to the active layer and such that current flow through the active layer is substantially uniform in all portions of the active layer except for portions of the active layer disposed underneath the strip-shaped electrode where there is substantially no current flow.
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Specification