High brightness and high contrast plastic leaded chip carrier LED
View Patent ↗A Plastic Leaded Chip Carrier (PLCC) package is disclosed. The PLCC package provides a light source that is both high contrast and high brightness. Specifically, the PLCC package includes a reflector cup whose surface area is partially inclusive of a lead frame and partially inclusive of a plastic housing that surrounds the lead frame.
1. A Plastic Leaded Chip Carrier (PLCC) package, comprising:
a lead frame;
a plastic housing attached to the lead frame, the plastic housing comprising at least one cavity which defines part of a reflector cup configured to receive a light source and exposes one or more leads of the lead frame such that a light source can be positioned in a bottom surface of the reflector cup and connected to the one or more leads, wherein a wall of the reflector cup extending from the bottom surface of the reflector cup to a top surface of the plastic housing comprises a portion of the lead frame and a portion of the plastic housing so the wall has a continuous circumference crossing the portion of the lead frame and the portion of the housing.
2. The PLCC package of claim 1 , wherein all circumferences of the wall comprise both a portion of the lead frame and a portion of the plastic housing.
3. The PLCC package of claim 1 , wherein the wall is conical extending outwardly from the bottom surface.
4. The PLCC package of claim 1 , wherein the lead frame comprises a first raised portion that is integrated into the wall of the reflector cup.
5. The PLCC package of claim 4 , wherein the lead frame comprises a second raised portion that is also integrated into the wall of the reflector cup and wherein the first raised portion is electrically isolated from the second raised portion.
6. The PLCC package of claim 5 , wherein the first raised portion is connected to a first lead of the lead frame and wherein the second raised portion is connected to a second lead of the lead frame.
7. The PLCC package of claim 5 , wherein the first and second raised portions comprise folded tabs that are connected to the lead frame.
8. The PLCC package of claim 4 , wherein the plastic housing comprises a black plastic, wherein the first raised portion comprises metal, and wherein the wall of the reflector cup includes both the black plastic and the metal.
9. The PLCC package of claim 1 , wherein a top surface of the plastic housing comprises at least one of a black plastic and a white plastic.
10. The PLCC package of claim 1 , further comprising an encapsulant that fills at least a portion of the reflector cup.
11. The PLCC package of claim 10 , wherein the encapsulant comprises at least one of epoxy, silicone, a hybrid of silicone and epoxy, phosphor, a hybrid of phosphor and silicone, an amorphous polyamide resin or fluorocarbon, glass, and plastic.
12. A lead frame for a PLCC package, the lead frame comprising a first lead and a second lead, wherein a first raised portion is connected to the first lead, wherein a second raised portion is connected to the second lead, wherein the first and second raised portions are configured to be integrated into a wall of a reflector cup so the wall has a continuous circumference crossing the first raised portion and the second raised portion, and wherein the first and second raised portions are electrically isolated from one another.
13. The lead frame of claim 12 , wherein the lead frame comprises one or more fastening features.
14. The lead frame of claim 13 , wherein the one or more fastening features comprise at least one of a fastening hole and a fastening groove formed in at least one of the first and second leads.
15. The lead frame of claim 12 , further comprising a third lead that does not include a raised portion connected thereto.
16. The lead frame of claim 15 , wherein each of the first, second, and third leads comprise a first portion and an electrically isolated second portion.
17. The lead frame of claim 12 , wherein the first and second leads comprise at least one of C-leads, SOJ leads, gull wing leads, reverse gull wing leads, and straight cut leads.
18. A Plastic Leaded Chip Carrier (PLCC) package, comprising:
a lead frame comprising a first lead and a second lead, wherein a first raised portion is connected to the first lead, wherein a second raised portion is connected to the second lead, and wherein the first and second raised portions are electrically isolated from one another;
a plastic housing; and
a reflector cup established in the plastic housing, wherein the first and second raised portions of the lead frame are integrated into a wall of the reflector cup so the wall has a continuous circumference crossing the first raised portion and the second raised portion.
19. The PLCC package of claim 18 , wherein the wall of the reflector cup also comprises the plastic housing.
20. The PLCC package of claim 18 , wherein the first and second raised portions comprise folded tabs that are connected to the lead frame and wherein the plastic housing comprises a black plastic.