Plastic leaded chip carrier with diagonally oriented light sources for fine-pitched display

• US 8,740,411 B2
• Filed: 10/01/2012
• Issued: 06/03/2014
• Est. Priority Date: 10/01/2012
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Inventors: Yong, Lig Li, Ng, Keat Chuan, Yaw, Yean Chon
• Primary Examiner(s): Reames, Matthew
• Assistant Examiner(s): Choi, Nicholas J
• Application Number:
  US13/632,977
• Publication Number:
  US 20140091340A1
• Time in Patent Office: 610 Days
• Field of Search: 257 98-100, D13/180, D13/182, 362/249.02
• US Class Current: 362/249.02
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 33/486 adapted for surface mounting

Abstract

A Plastic Leaded Chip Carrier (PLCC) package is disclosed. The PLCC package is configured to support a plurality of light sources. The light sources may be mounted on a mounting section of the PLCC package'"'"'s lead frame and the mounting section of the lead frame may extend diagonally with respect to the housing of the lead frame.

Claims

1. A Plastic Leaded Chip Carrier (PLCC) package, comprising:

a lead frame, comprising;

a mounting section configured to support two or more light sources, the mounting section comprising a length and width that is less than its length; and

at least one lead;

a housing having a first corner and a second corner that is diagonally-disposed relative to the first corner and that is separated from the first corner by at least two edges of the housing, wherein the length of the mounting section of the lead frame extends longitudinally between the first corner and second corner and wherein the length of the mounting section is longer than any of the at least two edges of the housing.

2. The PLCC package of claim 1, further comprising:

two or more light sources, each of the two or more light sources being secured to the mounting section along a line drawn from the first corner to the second corner.

3. The PLCC package of claim 2, wherein the two or more light sources include a first light source, a second light source, and a third light source.

4. The PLCC package of claim 3, wherein the first light source is configured to produce light of a first color, wherein the second light source is configured to produce light of a second color, and wherein the third light source is configured to produce light of a third color.

5. The PLCC package of claim 3, wherein the at least one lead comprises a first lead, a second lead, a third lead, a fourth lead, a fifth lead, and a sixth lead, wherein the first light source is electrically connected to the first lead and the second lead, wherein the second light source is electrically connected to the third lead and the fourth lead, and wherein the third light source is electrically connected to the fifth lead and the sixth lead.

6. The PLCC package of claim 2, wherein the lead frame comprises two or more reflector cups, wherein each light source in the two or more light sources is mounted in a different reflector cup.

7. The PLCC package of claim 2, further comprising:

an encapsulant that covers the mounting section, each of the two or more light sources, and bonding wires that electrically connect the two or more light sources to the lead frame.

8. The PLCC package of claim 7, wherein the encapsulant comprises a substantially planar top surface.

9. The PLCC package of claim 7, wherein the encapsulant comprises at least one lens feature.

10. The PLCC package of claim 9, wherein the at least one lens feature is a shared lens.

11. The PLCC package of claim 9, wherein the at least one lens feature corresponds to two or more discrete lenses.

12. The PLCC package of claim 7, 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.

13. The PLCC package of claim 1, further comprising at least one via established through the housing that is filled with an encapsulant that also encapsulates the two of more light sources.

14. A multi-light source Plastic Leaded Chip Carrier (PLCC) package, comprising:

a plastic housing including a first side edge, a second side edge, a third side edge, and a fourth side edge, the plastic housing also including a first corner that connects the first side edge and the second side edge, a second corner that connects the second side edge and the third side edge, a third corner that connects the third side edge and the fourth side edge, and a fourth corner that connects the fourth side edge and the first side edge;

a lead frame including a mounting section that completely extends from the first corner to the third corner, the lead frame also including at least one lead;

a first light source positioned at a first location on the mounting section of the lead frame; and

a second light source positioned at a second location on the mounting section of the lead frame.

15. The PLCC package of claim 14, wherein the first side edge is substantially parallel to the third side edge and wherein the second side edge is substantially parallel to the fourth side edge.

16. The PLCC package of claim 15, wherein the first, second, third, and fourth side edges are substantially the same length and wherein the mounting section of the lead frame is longer than any of the first, second, third, or fourth side edges.

17. The PLCC package of claim 14, further comprising a third light source positioned at a third location on the mounting section of the lead frame.

18. The PLCC package of claim 17, wherein the first, second, and third locations substantially coincide with a line drawn from the first corner to the third corner.

19. The PLCC package of claim 17, wherein each of the first, second, and third light sources correspond to a Light Emitting Diode, wherein the first light source is mounted in a first reflector cup established on the mounting section, wherein the second light source is mounted in a second reflector cup established on the mounting section, and wherein the third light source is mounted in a third reflector cup established on the mounting section.

20. The PLCC package of claim 14, further comprising an encapsulant that substantially fills a cavity established on an upper part of the housing, wherein the encapsulant also covers the first light source and second light source, and wherein the encapsulant hermetically seals the first light source and the second light source.