LED Light Source Having Flexible Reflectors

• US 20080144322A1
• Filed: 12/15/2006
• Published: 06/19/2008
• Est. Priority Date: 12/15/2006
• Status: Abandoned Application

• Current Assignee: Avago Technologies ECBU IP Singapore Pte Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies ECBU IP Singapore Pte Limited (Broadcom, Inc.)
• Inventors: Chew, Tong Fatt, Tan, Kheng Leng, Pang, Siew It, Norfidathul, Aizar Abdul Karim
• Application Number:
  US11/611,518
• Publication Number:
  US 20080144322A1
• Time in Patent Office: Days
• US Class Current: 362/310
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 24/97 the devices being connected to a common substrate, e.g. interposer, said common substrate being separable into individual assemblies after connecting
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• 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 2924/00014 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 2924/01322 Eutectic Alloys, i.e. obtained by a liquid transforming into two solid phases
• CPC Class Codes: H01L 33/486 adapted for surface mounting
• CPC Class Codes: H01L 33/60 Reflective elements

Abstract

A light source having a rigid substrate, a first LED, and a flexible reflector housing is disclosed. The rigid substrate has a first surface having a plurality of electrical traces formed thereon, the first LED die being disposed on the first surface and connected to two of the electrical traces. The rigid substrate also includes a plurality of external electrical connections for accessing the electrical traces. The reflector housing includes a layer of flexible material having at least one cavity extending through the layer of flexible material. The layer of flexible material is bonded to the first surface such that the cavity overlies the first LED die. The cavity has walls that reflect light generated in the first LED die. The first die can be encapsulated in a layer of silicone encapsulant. The reflector can likewise be constructed from silicone.

Claims

1. A light source comprising:

a rigid substrate having a first surface having a plurality of electrical traces formed thereon,

a first LED die disposed on said first surface and connected to two of said electrical traces,

a plurality of external electrical connections for accessing said electrical traces.

a reflector housing comprising a layer of flexible material having at least one cavity extending through said layer of flexible material being bonded to said first surface such that said cavity overlies said first LED die, said cavity having walls that reflect light generated in said first LED die.

2. The light source of claim 1 wherein said flexible material comprises silicone.

3. The light source of claim 1 wherein said cavity is filled with a transparent encapsulant such that said first LED die is encapsulated by said encapsulant and said rigid substrate.

4. The light source of claim 3 wherein said encapsulant comprises silicone.

5. The light source of claim 3 wherein said encapsulant comprises a first layer of encapsulant adjacent to said first LED die and a second layer of encapsulant that overlies said first layer of encapsulant, wherein light emitted by said first LED die is characterized by a first spectrum and wherein said first layer of encapsulant comprises a luminescent conversion material that alters said first spectrum to create light of a second spectrum that exits said light source.

6. The light source of claim 1 wherein said cavity walls comprise a layer of reflective material chosen from the group consisting of silver, nickel, nickel-gold and aluminum.

7. The light source of claim 1 wherein said transparent encapsulant comprises a lens.

8. The light source of claim 1 further comprising a second LED die, said cavity overlying said second LED die.