Water resistant LED devices and an LED display including same

• US 9,054,257 B2
• Filed: 11/21/2012
• Issued: 06/09/2015
• Est. Priority Date: 11/24/2011
• Status: Active Grant

• Current Assignee: Cree Huizhou Solid State Lighting Company Limited (Smart Global Holdings Incorporated)
• Original Assignee: Cree Huizhou Solid State Lighting Company Limited (Smart Global Holdings Incorporated)
• Inventors: Chan, Chi Keung, Pang, Chak Hau, Ruan, Fei Fei, Li, Fei Hong
• Primary Examiner(s): MENZ, DOUGLAS M
• Application Number:
  US13/683,427
• Publication Number:
  US 20130134454A1
• Time in Patent Office: 930 Days
• Field of Search: 257/88, 257/98
• US Class Current: 1/1
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2933/0033 relating to semiconductor body packages
• CPC Class Codes: H01L 33/08 with a plurality of light emitting regions, e.g. laterally discontinuous light emitting layer or photoluminescent region integrated within the semiconductor body H01L27/15 takes precedence
• CPC Class Codes: H01L 33/486 adapted for surface mounting
• CPC Class Codes: H01L 33/60 Reflective elements
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls

Abstract

The disclosure provides an LED package including a first plastic portion having a mounting surface and a lower surface. In some embodiments, the LED package includes a second portion surrounding the first plastic portion and exposing the mounting surface and the lower surface of the first plastic portion. In other embodiments, the first plastic portion includes at least one of a hole or a protrusion and the second portion includes corresponding structure filing the hole or surrounding the protrusion of the first plastic portion. The first plastic portion and the second portion have different optical properties.

Claims

1. A light emitting diode (LED) package comprising:

a first plastic portion having a mounting surface and a lower surface; and

a second portion surrounding the first plastic portion and exposing the mounting surface and the lower surface of the first plastic portion,

wherein the first plastic portion and the second portion have different optical properties.

2. The LED package of claim 1, wherein the first plastic portion further comprises an outer wall surface having a plurality of grooves, and wherein the second portion includes an inner surface with patterns that matches the plurality of grooves.

3. The LED package of claim 1, wherein the lower surface of the first plastic portion includes a relieved structure having a cross pattern.

4. The LED package of claim 1, wherein the lower surface of the first plastic portion has a substantial rectangular shape, and the lower surface has an area greater than an area of the mounting surface.

5. The LED package of claim 1, wherein the lower surface of the first plastic portion has a plurality of holes, and wherein protrusions of the second portion extend into the holes and secure the second portion to the first plastic portion.

6. The LED package of claim 5, wherein the plurality of holes are disposed between the mounting surface and the lower surface, and the holes have center axes substantially parallel to the mounting surface.

7. The LED package of claim 1, wherein the first plastic portion and the second portion have different colors.

8. The LED package of claim 7, wherein the first plastic portion and the second portion have different light absorbing properties.

9. The LED package of claim 7, wherein the first plastic portion and the second portion have different light reflectivities.

10. The LED package of claim 7, wherein the first plastic portion comprises light color polyphthalamide(PPA) and the second portion comprises dark PPA.

11. The LED package of claim 1, wherein the first plastic portion and the second portion have substantially equal profile heights.

12. The LED package of claim 1, further comprising a conductive lead frame that comprises:

a plurality of electrically conductive cathode parts each having a contact pad; and

a corresponding plurality of electrically conductive anode parts each having a corresponding mounting pad carrying an LED,

wherein the contact pad and the mounting pad have different surface areas.

13. The LED package of claim 12, wherein the plurality of electrically conductive cathode parts and the corresponding plurality of electrically conductive anode parts have bent portions that traverse the mounting surface and the lower surface of the first plastic portion.

14. A light emitting diode (LED) package comprising:

a first plastic portion having a mounting surface and a lower surface; and

a second portion surrounding the first plastic portion and exposing the mounting surface and the lower surface of the first plastic portion,

wherein the first plastic portion further comprises an outer wall surface having a plurality of grooves.

15. The LED package of claim 14, wherein the second portion includes an inner surface with patterns that matches the plurality of grooves.

16. The LED package of claim 14, wherein the first plastic portion comprises light color polyphthalamide(PPA) and the second portion comprises dark PPA.

17. The LED package of claim 14, wherein the first plastic portion and the second portion have substantially equal profile heights.

18. The LED package of claim 14, further comprising a conductive lead frame that comprises:

a plurality of electrically conductive cathode parts each having a contact pad; and

a corresponding plurality of electrically conductive anode parts each having a corresponding mounting pad carrying an LED,

wherein the contact pad and the mounting pad have different surface areas.