Hybrid combination of substrate and carrier mounted light emitting devices
View Patent ↗A multi-chip light emitting device (LED) uses a low-cost carrier structure that facilitates the use of substrates that are optimized to support the devices that require a substrate. Depending upon the type of LED elements used, some of the LED elements may be mounted on the carrier structure, rather than on the more expensive ceramic substrate. In like manner, other devices, such as sensors and control elements, may be mounted on the carrier structure as well. Because the carrier and substrate structures are formed independent of the encapsulation and other after-formation processes, these structures can be tested prior to encapsulation, thereby avoiding the cost of these processes being applied to inoperative structures.
1. A method comprising:
providing one or more first light emitting elements on a substrate;
slicing the substrate to form a plurality of discrete light emitting elements;
providing one or more second elements on a plurality of carriers in a frame;
placing the plurality of discrete light emitting elements into the frame; and
slicing the frame to create a plurality of discrete light emitting devices that include a carrier, one or more second elements, and one or more discrete light emitting elements, wherein:
at least one of the second elements has a thinner profile than a profile of the discrete light emitting elements, and
the carrier is formed such that a lower surface of the discrete light emitting element is situated at a lower elevation than a lower surface of the at least second element having the thinner profile.
2. The method of claim 1 , wherein the one or more second elements include one or more second light emitting elements.
3. The method of claim 2 , including adding a wavelength conversion element to one or more of the first and second light emitting elements.
4. The method of claim 1 , including wire bonding the discrete light emitting elements to circuit traces on the carriers.
5. The method of claim 1 , including testing each of the first light emitting elements on the substrate to identify operable first light emitting elements; wherein the plurality of discrete light emitting elements include only operable light emitting elements.
6. The method of claim 1 , including encapsulating the discrete light emitting elements in the frame.
7. The method of claim 1 , including coupling the plurality of discrete light emitting elements to the plurality of carriers via one or more contacts at one or more edges of the discrete light emitting elements.
8. The method of claim 1 , including coupling the plurality of discrete light emitting elements to the plurality of carriers via one or more contacts at a base of the discrete light emitting elements.
9. The method of claim 1 , including applying a reflective layer to the frame.
10. The method of claim 9 , wherein the reflective layer serves to adhere the discrete light emitting elements to the carriers.