Waveguide-based packaging structures and methods for discrete lighting elements
In one aspect, an illumination source includes a socket formed by the union of a sub-assembly platform and a light-guide element, and a discrete light source received in the socket. In another aspect, the light-guide element includes a concentration region proximate an in-coupling region opposite an out-coupling region, the concentration region directing multidirectional light from the in-coupling region toward the out-coupling region.
1. An illumination source comprising:
a socket formed by the union of a sub-assembly platform and a light-guide element;
a discrete light source received in the socket, the discrete light source comprising a bare LED die disposed over and electrically connected to the sub-assembly platform; and
an encapsulation material disposed between and in direct contact with the LED die and the light-guide element,
wherein a portion of the light-guide element disposed above the LED die is substantially planar.
2. The illumination source of claim 1 , wherein the light-guide element is disposed over and in direct contact with the sub-assembly platform and functions as at least a portion of a package for the LED die.
3. The illumination source of claim 1 , wherein the sub-assembly platform comprises a contour electrical connection.
4. The illumination source of claim 1 , wherein the discrete light source is thermally connected to the sub-assembly platform.
5. The illumination source of claim 1 , wherein the sub-assembly platform comprises a mechanical interface for connecting the illumination source to a structure.
6. The illumination source of claim 1 , wherein the light-guide element comprises spatially distinct in-coupling and out-coupling regions, light injected into the in-coupling region by the discrete light source being substantially retained within the light-guide element for emission from the out-coupling region.
7. The illumination source of claim 1 , wherein the discrete light source is top-emitting.
8. The illumination source of claim 1 , wherein the discrete light source is a Lambertian source.
9. The illumination source of claim 1 , wherein the sub-assembly platform comprises a printed circuit board in direct contact with the LED die.
10. The illumination source of claim 6 , wherein the light-guide element comprises a planar concentration region for directing light toward the out-coupling region, a sidewall of the concentration region being substantially parabolic.
11. The illumination source of claim 6 , wherein the out-coupling region comprises a plurality of sections each comprising a different density of out-coupling elements.