COVER STRUCTURE FOR BEAMSHAPING FOR LIGHT EMITTING DIODE PACKAGES
Solid-state lighting devices, and more particularly, cover structures for beamshaping for multi-chip light emitting diode (LED) components are disclosed. The cover structure can reduce the far field emission pattern variation due to having different light emission sources on a multi-chip LED component. The cover structure can include channels, or tunnels, within an otherwise light-transmissive material that perform beamshaping of at least a portion of the light emitted from the multiple LED chips. The beamshaping can be a result of a predetermined orientation and/or distribution pattern of the channels that redirect the light. The cover structure can also include textured surfaces or light-altering materials that can further diffuse the light emitted from the multi-chip LED component.
1 . A cover structure, comprising:
a plurality of channels that pass through at least a portion of a distance between a top of the cover structure and a bottom of the cover structure, wherein the cover structure modifies an emission pattern of light emitted from a light source at a bottom of the cover structure.
2 . The cover structure of claim 1 , wherein the cover structure is mounted over at least a portion of each light emitting diode (LED) chip of a plurality of LED chips that are mounted on a substrate.
3 . The cover structure of claim 1 , wherein the plurality of channels are open to at least one of the top of the cover structure or the bottom of the cover structure.
4 . The cover structure of claim 1 , wherein the plurality of channels are cylindrical.
5 . The cover structure of claim 1 , wherein a channel diameter of the plurality of channels is between 1 micron and 1 millimeter.
6 . The cover structure of claim 2 , wherein the plurality of channels have a distribution or orientation so as to reduce a variation in a far-field emission pattern caused by separation between the plurality of LED chips.
7 . The cover structure of claim 2 , wherein the plurality of channels have a distribution pattern within the cover structure with a higher density over an area of the substrate between the plurality of LED chips.
8 . The cover structure of claim 1 , wherein the plurality of channels have a distribution pattern within the cover structure with a density that corresponds to a distance from an edge of the cover structure.
9 . The cover structure of claim 1 , wherein the plurality of channels are oriented such that a top of respective channels is closer to a center of the cover structure than a bottom of the respective channels.
10 . The cover structure of claim 2 , wherein the cover structure covers a top of the plurality of LED chips.
11 . The cover structure of claim 1 , wherein the cover structure has a curved top surface.
12 . The cover structure of claim 1 , further comprising a lens covering the cover structure.
13 . The cover structure of claim 12 , wherein the lens comprises diffusion material.
14 . The cover structure of claim 12 , wherein the lens comprises a wavelength conversion material.
15 . The cover structure of claim 1 , wherein the cover structure comprises a wavelength conversion material.
16 . The cover structure of claim 1 , wherein the cover structure comprises a textured surface with a plurality of regular or irregular light-extraction features.
17 . The cover structure of claim 1 , wherein the cover structure comprises diffusion material that diffuses light passing through the cover structure.
18 . The cover structure of claim 17 , wherein the diffusion material is formed in a layer within the cover structure.
19 . The cover structure of claim 1 , wherein the cover structure is formed from at least one of sapphire, glass, silicone, or indium tin oxide.
20 . A light emitting diode (LED) component, comprising:
a plurality of LED chips mounted on a substrate; and
a cover structure mounted over at least a portion of each LED chip of the plurality of LED chips, wherein the cover structure comprises a plurality of channels that pass through at least a portion of a distance between a top of the cover structure and a bottom of the cover structure and wherein the plurality of channels are configured to modify an emission pattern of light emitted from the plurality of LED chips.