Arrangements of light-altering coatings in light-emitting diode packages
Light-emitting diode (LED) packages, and more particularly arrangements of light-altering coatings in LED packages are disclosed. Exemplary LED packages may include lead frame structures that are at least partially encased by a housing. Arrangements of light-altering coatings may be provided that cover one or more portions of lead frame structures exposed within LED package recesses. By providing light-altering coatings that cover lead frame structures within package recesses, negative impacts from potential lead frame discoloration due to environmental exposure may be reduced. Additionally, such light-altering coatings may be configured to reflect light emissions from LED chips before reaching portions of lead frame structures. Light-altering coating arrangements are disclosed where light-altering coatings are arranged in contact with LED chips or, alternatively, in a spaced relationship with LED chips. Retention structures are disclosed that may define boundaries of light-altering coatings along recess floors of corresponding LED packages.
1. A light-emitting diode (LED) package comprising:
a housing that forms a recess with a recess floor and one or more recess sidewalls;
a lead frame structure extending through the housing, wherein a portion of the lead frame structure is arranged along the recess floor;
at least one LED chip arranged within the recess and electrically coupled with the lead frame structure; and
a light-altering coating arranged on the one or more recess sidewalls, the recess floor, and the portion of the lead frame structure that is arranged along the recess floor;
wherein the light-altering coating is arranged on sides of the at least one LED chip at a height above the recess floor that is in range from 50% to 90% of a corresponding height of the at least one LED chip above the recess floor.
2. The LED package of claim 1 , wherein the light-altering coating comprises one or more of light-reflective particles and light-absorbing particles suspended in a binder.
3. The LED package of claim 1 , wherein the light-altering coating only partially covers the one or more recess sidewalls.
4. The LED package of claim 3 , wherein the light-altering coating covers a range from 25% to 75% of the one or more recess sidewalls.
5. The LED package of claim 1 , wherein the light-altering coating is formed with a non-uniform thickness along the recess floor.
6. The LED package of claim 1 , wherein the light-altering coating forms a curved upper surface that is opposite the recess floor.
7. The LED package of claim 1 , further comprising an encapsulant that is arranged within the recess such that the light-altering coating is between the encapsulant and the recess floor.
8. The LED package of claim 7 , wherein the encapsulant forms a lens shape above the housing.
9. The LED package of claim 1 , wherein the light-altering coating is arranged to only partially cover the recess floor such that an inner edge of the light-altering coating is laterally spaced from the at least one LED chip across the recess floor.
10. A light-emitting diode (LED) package comprising:
a housing that forms a recess with a recess floor and one or more recess sidewalls;
a lead frame structure extending through the housing, wherein a portion of the lead frame structure is arranged along the recess floor;
at least one LED chip arranged within the recess and electrically coupled with the lead frame structure;
at least one retention structure arranged along the recess floor, wherein the at least one retention structure comprises a ridge that is raised above the recess floor; and
a light-altering coating that extends across the recess floor from the recess sidewalls to the at least one retention structure, wherein the ridge comprises a same material as the light-altering coating.
11. The LED package of claim 10 , wherein the ridge comprises a different material from the housing.
12. The LED package of claim 10 , wherein the ridge extends across portions of the housing and the lead frame structure along the recess floor.
13. The LED package of claim 10 , wherein the retention structure forms a ring shape around the at least one LED chip along the recess floor.
14. The LED package of claim 10 , wherein the retention structure is arranged in a linear manner along the recess floor.
15. A light-emitting diode (LED) package comprising:
a housing that forms a recess with a recess floor and one or more recess sidewalls;
a lead frame structure extending through the housing, wherein a portion of the lead frame structure is arranged along the recess floor;
at least one LED chip arranged within the recess and electrically coupled with the lead frame structure;
at least one retention structure arranged along the recess floor, wherein the at least one retention structure comprises a ridge that is raised above the recess floor and the ridge comprises a same material as the housing; and
a light-altering coating that extends across the recess floor from the recess sidewalls to the at least one retention structure.
16. The LED package of claim 15 , wherein the at least one retention structure forms a ring shape around the at least one LED chip along the recess floor.
17. The LED package of claim 15 , wherein the at least one retention structure is arranged in a linear manner along the recess floor.
18. A light-emitting diode (LED) package comprising:
a housing that forms a recess with a recess floor and one or more recess sidewalls;
a lead frame structure extending through the housing, wherein a portion of the lead frame structure is arranged along the recess floor;
at least one LED chip arranged within the recess and electrically coupled with the lead frame structure;
at least one retention structure arranged along the recess floor, wherein the at least one retention structure comprises a trench that extends into the recess floor, wherein the trench laterally extends through both a portion of the housing and a portion of the lead frame structure along the recess floor; and
a light-altering coating that extends across the recess floor from the recess sidewalls to the at least one retention structure.
19. The LED package of claim 18 , wherein the at least one retention structure forms a ring shape around the at least one LED chip along the recess floor.
20. The LED package of claim 18 , wherein the at least one retention structure is arranged in a linear manner along the recess floor.