LED device and method for directing LED light

• US 20050190561A1
• Filed: 02/27/2004
• Published: 09/01/2005
• Est. Priority Date: 02/27/2004
• Status: Active Grant

• Current Assignee: Document Security Systems, Inc.
• Original Assignee: Avago Technologies ECBU IP Singapore Pte Limited (Broadcom, Inc.)
• Inventors: Ng, Kee Yean, Afif, Fakhrul Arifin Mohd, Abidin, Mohammad Zamri Zainal, Sim, Teong Heng, Jiwa, Noor Azian Mat, Seah, Keh Chin
• Granted Patent: US 7,261,441 B2
• Time in Patent Office: Days
• US Class Current: 362/307
• CPC Class Codes: H01L 2224/16145 the bodies being stacked
• CPC Class Codes: H01L 2224/32245 the item being metallic
• CPC Class Codes: H01L 2224/32257 the layer connector connecting to a bonding area disposed in a recess of the surface of the item
• CPC Class Codes: H01L 2224/4809 Loop shape
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/181 Encapsulation
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H01L 33/60 Reflective elements
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A LED device including a first encapsulant that at least partially encapsulates a LED and resides within a light reflecting cavity, and a second encapsulant residing above the first encapsulant—wherein the first encapsulant is partially comprised of a first percentage of a first light reflecting substance. In addition, there is provided a method for constructing a LED device.

Claims

1. A LED device for directing light including:

a LED;

a light reflecting cavity in which the LED resides;

a first encapsulant that at least partially encapsulates the LED and resides within the light reflecting cavity;

a second encapsulant residing above the first encapsulant;

a first device terminal;

a first connection between the first device terminal and the LED;

a second device terminal;

a second connection between the second device terminal and the LED; and

wherein the first encapsulant is partially comprised of a first percentage of a first light reflecting substance.

2. A LED device for directing light according to claim 1 wherein a side surface of the LED is at least partially encapsulated by the first encapsulant.

3. A LED device for directing light according to claim 2 wherein a side surface of the LED is completely encapsulated by the first encapsulant.

4. A LED device for directing light according to claim 3 wherein the upper surface of the first encapsulant resides above an upper surface of the LED.

5. A LED device for directing light according to claim 1 wherein the first encapsulant fills the light reflecting cavity to an upper perimeter of the light reflecting cavity.

6. A LED device for directing light according to claim 1 wherein the second encapsulant is partially comprised of a second percentage of a second light reflecting substance.

7. A LED device for directing light according to claim 6 wherein the second percentage is less than the first percentage.

8. A LED device for directing light according to claim 7 wherein the first percentage is less than approximately one third of the second percentage.

9. A LED device for directing light according to claim 8 wherein the first percentage is less than approximately one half of the second percentage.

10. A LED device for directing light according to claim 1 wherein the first percentage is between 3% and 40%.

11. A LED device for directing light according to claim 6 wherein the first percentage is between 3% and 40%.

12. A LED device for directing light according to claim 1 wherein the first percentage is between 3% and 10%.

13. A LED device for directing light according to claim 6 wherein the first percentage is between 3% and 10%.

14. A method for constructing a LED device including:

mounting a LED into a light reflecting cavity;

connecting the LED to a first device terminal and a second device terminal;

at least partially filling the light reflecting cavity with a first encapsulant which is at least partially comprised of a first percentage of a first light reflecting substance; and

placing a second encapsulant above the first encapsulant.

15. A method for constructing a LED device according to claim 14 wherein the second encapsulant is partially comprised of a second percentage of a second light reflecting substance.

16. A method for constructing a LED device according to claim 15 wherein the second percentage is less than the first percentage.