ILLUMINATION APPARATUS AND METHODS OF FORMING THE SAME
An illumination device includes a waveguide having a recess in a bottom surface thereof. Disposed beneath and in direct contact with the bottom surface of the waveguide is a sub-assembly having a raised profile complementary to the recess, the sub-assembly including a discrete light source disposed on a carrier. The discrete light source is disposed within the recess.
1 . An illumination device comprising:
a waveguide comprising a recess in a bottom surface thereof; and
disposed beneath and in direct contact with the bottom surface of the waveguide, a sub-assembly having a raised profile complementary to the recess, the sub-assembly comprising a discrete light source disposed on a carrier,
wherein the discrete light source is disposed within the recess.
2 . The illumination device of claim 1 , wherein the sub-assembly comprises a cap disposed over the discrete light source.
3 . The illumination device of claim 1 , wherein the sub-assembly comprises:
a substrate; and
a reflector disposed over the substrate,
wherein the reflector is disposed beneath and in direct contact with the bottom surface of the waveguide proximate the recess.
4 . The illumination device of claim 1 , wherein a top surface of the waveguide is substantially planar.
5 . The illumination device of claim 1 , wherein the discrete light source comprises a bare-die light-emitting diode.
6 . The illumination device of claim 1 , wherein a sidewall of the carrier is reflective.
7 . The illumination device of claim 1 , wherein a top surface of the carrier is reflective.
8 . The illumination device of claim 7 , wherein the top surface of the carrier comprises an inner diffusive region surrounding the discrete light source and a specular region surrounding the inner diffusive region.
9 . The illumination device of claim 7 , wherein the top surface of the carrier comprises an inner specular region, a diffusive region surrounding the inner specular region, and an outer specular region surrounding the diffusive region.
10 . A illumination device comprising:
a waveguide having a substantially planar bottom surface; and
disposed beneath and in direct contact with the bottom surface of the waveguide, a sub-assembly having a substantially planar top surface and a discrete light source disposed on a reflective carrier,
wherein a dimension of the reflective carrier is at least three times a dimension of the discrete light source.
11 . The illumination device of claim 10 , wherein the top surface of the reflective carrier comprises an inner diffusive region surrounding the discrete light source and a specular region surrounding the inner diffusive region.
12 . The illumination device of claim 10 , wherein the top surface of the reflective carrier comprises an inner specular region, a diffusive region disposed around the inner specular region, and an outer specular region disposed around the diffusive region.
13 . A method of forming an illumination device, the method comprising:
providing a waveguide comprising a recess in a bottom surface thereof;
providing a sub-assembly having a raised profile complementary to the recess, the sub-assembly comprising a discrete light source disposed on a carrier; and
mating the waveguide and the sub-assembly such that the discrete light source is disposed within the recess.
14 . The method of claim 13 , wherein a top surface of the waveguide is substantially planar.
15 . The method of claim 13 , wherein the discrete light source comprises a bare-die light-emitting diode.
16 . A plurality of sub-assemblies, each of which comprises:
a plurality of discrete lighting devices disposed over a carrier;
carrier interconnections disposed on the carrier and electrically connected to the discrete lighting devices; and
a substrate disposed beneath the carrier and comprising substrate interconnections disposed on the substrate and electrically connected to the carrier interconnections,
wherein the plurality of discrete lighting devices on a first sub-assembly is connected in series, the plurality of discrete lighting devices on a second sub-assembly is connected in parallel, and the carrier interconnections of the first sub-assembly is substantially identical to the carrier interconnections of the second sub-assembly.
17 . The plurality of sub-assemblies of claim 16 , wherein each sub-assembly is joined to a waveguide.
18 . The plurality of sub-assemblies of claim 17 , wherein each sub-assembly comprises a contour complementary to a recess in the waveguide to which it is joined.
19 . The plurality of sub-assemblies of claim 16 , wherein the series connection on the first sub-assembly is defined by the substrate interconnections on the first sub-assembly.
20 . The plurality of sub-assemblies of claim 16 , wherein the parallel connection on the second sub-assembly is defined by the substrate interconnections on the second sub-assembly.