Wafer level packaging of multiple light emitting diodes (LEDs) on a single carrier die
First Claim
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1. A Light Emitting Diode (LED) chip, comprising:
- an LED substrate including a plurality of LED dies, a respective LED die including an anode and a cathode;
a patterned internal interconnection layer that is internal to the plurality of LED dies and that is configured to selectively electrically connect the anodes and cathodes of the plurality of LED dies in series and/or in parallel internal to the plurality of LED dies;
an LED die anode contact that is electrically connected to at least one of the anodes; and
an LED die cathode contact that is electrically connected to at least one of the cathodes,wherein the patterned internal interconnection layer that is internal to the plurality of LED dies includes a first patterned internal interconnection layer face and a second patterned internal interconnection layer face that is opposite the first patterned internal interconnection layer face,wherein each of the plurality of LED dies includes a first layer that is on the first patterned internal interconnection layer face opposite the second patterned internal interconnection layer face, and a second layer that is on the second patterned internal interconnection layer face opposite the first patterned internal interconnection layer face,wherein the LED die anode contact penetrates through the first and second layers, penetrates through the first patterned internal interconnection layer face, penetrates through the second patterned internal interconnection layer face, electrically connects to the patterned internal interconnection layer and electrically connects to the at least one of the anodes, andwherein the LED die cathode contact penetrates through the first and second layers, penetrates through the first patterned internal interconnection layer face, penetrates through the second patterned internal interconnection layer face, electrically connects to the patterned internal interconnection layer and electrically connects to the at least one of the cathodes.
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Abstract
An LED wafer includes LED dies on an LED substrate. The LED wafer and a carrier wafer are joined. The LED wafer that is joined to the carrier wafer is shaped. Wavelength conversion material is applied to the LED wafer that is shaped. Singulation is performed to provide multiple LED dies that are joined to a single carrier die. The multiple LED dies on the single carrier die are connected in series and/or in parallel by interconnection in the LED dies and/or in the single carrier die. The singulated devices may be mounted in an LED fixture to provide high light output per unit area. Related devices and fabrication methods are described.
89 Citations
16 Claims
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1. A Light Emitting Diode (LED) chip, comprising:
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an LED substrate including a plurality of LED dies, a respective LED die including an anode and a cathode; a patterned internal interconnection layer that is internal to the plurality of LED dies and that is configured to selectively electrically connect the anodes and cathodes of the plurality of LED dies in series and/or in parallel internal to the plurality of LED dies; an LED die anode contact that is electrically connected to at least one of the anodes; and an LED die cathode contact that is electrically connected to at least one of the cathodes, wherein the patterned internal interconnection layer that is internal to the plurality of LED dies includes a first patterned internal interconnection layer face and a second patterned internal interconnection layer face that is opposite the first patterned internal interconnection layer face, wherein each of the plurality of LED dies includes a first layer that is on the first patterned internal interconnection layer face opposite the second patterned internal interconnection layer face, and a second layer that is on the second patterned internal interconnection layer face opposite the first patterned internal interconnection layer face, wherein the LED die anode contact penetrates through the first and second layers, penetrates through the first patterned internal interconnection layer face, penetrates through the second patterned internal interconnection layer face, electrically connects to the patterned internal interconnection layer and electrically connects to the at least one of the anodes, and wherein the LED die cathode contact penetrates through the first and second layers, penetrates through the first patterned internal interconnection layer face, penetrates through the second patterned internal interconnection layer face, electrically connects to the patterned internal interconnection layer and electrically connects to the at least one of the cathodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A Light Emitting Diode (LED) chip, comprising:
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a plurality of LED dies in a common substrate, a respective one of which includes an anode contact and a cathode contact on a face thereof; a carrier die having first and second opposing faces, a plurality of internal contacts on the first face and an external anode contact and an external cathode contact on the second face, wherein the plurality of LED dies in the common substrate includes a patterned internal interconnection layer that is internal to the plurality of LED dies and that is configured to electrically connect the anode and cathode contacts of the plurality of LED dies in series and/or in parallel internal to the plurality of LED dies; the plurality of LED dies and the carrier die being joined to one another so that the anode and cathode contacts of the LED dies are adjacent the first face of the carrier die and the anode and cathode contacts of the plurality of LED dies are connected in series and/or in parallel, wherein the patterned internal interconnection layer that is internal to the plurality of LED dies includes a first patterned internal interconnection layer face and a second patterned internal interconnection layer face that is opposite the first patterned internal interconnection layer face, wherein each of the plurality of LED dies includes a first layer that is on the first patterned internal interconnection layer face opposite the second patterned internal interconnection layer face, and a second layer that is on the second patterned internal interconnection layer face opposite the first patterned internal interconnection layer face, wherein the anode contact penetrates through the first and second layers, penetrates through the first patterned internal interconnection layer face, penetrates through the second patterned internal interconnection layer face and electrically connects to the patterned internal interconnection layer, and wherein the cathode contact penetrates through the first and second layers, penetrates through the first patterned internal interconnection layer face, penetrates through the second patterned internal interconnection layer face and electrically connects to the patterned internal interconnection layer. - View Dependent Claims (16)
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Specification