Light emitting diodes packaged for high temperature operation
DC CAFCFirst Claim
1. A packaged LED for high temperature operation comprising:
- a metal base, the metal base including an underlying thermal connection pad and a pair of underlying electrical connection pads;
a layer of ceramic overlying the metal base; and
an LED mounted on the ceramic layer, wherein the LED includes a pair of electrodes electrically connected to respective underlying electrical connection pads, and wherein the LED is thermally coupled to the metal base by one or more thermal vias, and thermally coupled through the metal base to the thermal connection pad.
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Litigations
2 Petitions
Accused Products
Abstract
In accordance with the invention, an LED packaged for high temperature operation comprises a metal base including an underlying thermal connection pad and a pair of electrical connection pads, an overlying ceramic layer, and a LED die mounted overlying the metal base. The LED is thermally coupled through the metal base to the thermal connection pad, and the electrodes are electrically connected to the underlying electrical connection pads. A low thermal resistance insulating layer can electrically insulate other areas of die from the base while permitting heat passage. Heat flow can be enhanced by thermal vias to the thermal connector pad. Ceramic layers formed overlying the base can add circuitry and assist in distributing emitted light. The novel package can operate at temperatures as high as 250° C.
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Citations
30 Claims
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1. A packaged LED for high temperature operation comprising:
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a metal base, the metal base including an underlying thermal connection pad and a pair of underlying electrical connection pads; a layer of ceramic overlying the metal base; and an LED mounted on the ceramic layer, wherein the LED includes a pair of electrodes electrically connected to respective underlying electrical connection pads, and wherein the LED is thermally coupled to the metal base by one or more thermal vias, and thermally coupled through the metal base to the thermal connection pad. - View Dependent Claims (3, 4, 5, 6)
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2. The packaged LED of claim wherein the underlying electrical connection pads and the underlying thermal connection pad are coplanar to permit surface mounting on corresponding pads of a PC board.
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7. A packaged LED for high temperature operation comprising:
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a metal base, the metal base including an underlying thermal connection pad and a pair of underlying electrical connection pads; a layer of ceramic overlying the metal base; and an LED having a pair of electrodes overlying the metal base, wherein the LED is thermally coupled through the metal base to the thermal connection pad and at least one electrode is electrically connected to at least one of the underlying electrical connection pads by an electrical path including an insulated conducting via through the metal base. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A packaged LED for high temperature operation comprising:
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a metal base, the metal base including an underlying thermal connection pad and a pair of underlying electrical connection pads; a layer of electrically insulating material overlying the metal base; and an LED mounted on the layer of electrically insulating material, wherein the LED includes a pair of electrodes electrically connected to respective underlying electrical connection pads, and wherein the LED is thermally coupled to the metal base by one or more thermal vias, and thermally coupled through the metal base to the thermal connection pad. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A packaged LED for high temperature operation comprising:
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a metal base, the metal base including an underlying thermal connection pad and a pair of underlying electrical connection pads; a layer of electrically insulating material overlying the metal base; and an LED having a pair of electrodes overlying the metal base, wherein the LED is thermally coupled through the metal base to the thermal connection pad and at least one electrode is electrically connected to at least one of the underlying electrical connection pads by an electrical path including an insulated conducting via through the metal base. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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Specification