Light Source Comprising Led Arranged in Recess

• US 20080203897A1
• Filed: 04/21/2006
• Published: 08/28/2008
• Est. Priority Date: 04/28/2005
• Status: Abandoned Application

• Current Assignee: Koninklijke Philips N.V.
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: De Samber, Marc Andre, Van Os, Koen
• Application Number:
  US11/912,346
• Publication Number:
  US 20080203897A1
• Time in Patent Office: Days
• US Class Current: 313/498
• 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 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• 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
• CPC Class Codes: H01L 33/642 characterized by the shape

Abstract

A light source comprising a substrate (1) having a first side and an opposing second side, at least one recess (2) being arranged in said first side of said substrate, a circuitry (4) at least partly arranged on said substrate (1), and at least one LED (3) being arranged in said at least one recess (2) and connected to said circuitry (4) is provided. The surface of said at least one recess (2) is continuous and is physically separated from said second side by substrate material. By arranging the LED in such a recess in the substrate, cross talk between adjacent LEDs is reduced, a good mechanical stability of the light source is maintained, and the thermal path through the substrate is reduced.

Claims

1-11. -11. (canceled)

12. A light source comprising a substrate (1) having a first side and an opposing second side, at least one recess (2) being arranged in said first side of said substrate, a circuitry (4) being arranged on said substrate (1), and at least one LED (3) being arranged in said at least one recess (2) and connected to said circuitry (4), said LED (3) and said circuitry (4) being electrically isolated from said substrate, wherein

the surface of said at least one recess is continuous and is physically separated from said second side by substrate material;

and

said at least one recess is at least partly filled with a luminescent compound (21) deposited in said recess (2′

) to cover the at least one LED (3′

).

13. A light source according to claim 12, wherein said at least one recess is filled with said luminescent compound in such a way as to form a surface below or in a plane of said first side of the substrate.

14. A light source according to claim 12, wherein said at least one recess is filled with said luminescent compound in such a way as to form a surface above a plane of said first side of the substrate.

15. A light source according to claim 12, wherein a heat sink (9) is arranged on said second side of said substrate (1), and said LED (3) is in thermal contact with said heat sink (9), at least partially via said substrate material separating said surface of said recess (2) and said second side of said substrate (1).

16. A light source according to claim 12, wherein said recess (2) comprises a reflective sidewall being tapered outwards towards said first side of said substrate.

17. A light source according to claim 12, wherein an optical element (8) is arranged on said first side of said substrate (1) to receive at least a portion of light emitted by said at least one LED (3).

18. A light source according to claim 17, wherein said optical element (8) comprises a recess (11), said substrate (1) being arranged in said recess (11) of said optical element (8).

19. A light source according to claim 12, wherein said circuitry (4) is connectable to a LED-driver (6) via said second side of said substrate.

20. A light source according to claim 12, wherein the connection between at least one LED (3) and said circuitry (4) is located in said recess (2).

21. A light source according to claim 12, comprising a first LED (3) arranged in a first recess (2) and a second LED (3′

) arranged in a second recess (2′

).

22. A light source according to claim 12, wherein said substrate (1) comprises a conducting or semi-conducting material having an electrically isolating surface layer (10) which isolates at least said LED (3) and said circuitry (4) from said substrate (1).

23. A light source according to claim 22, wherein said substrate (1) comprises silicon.

24. A light source according to claim 12, wherein the surface of said recess (2) and said second side of said substrate is separated by at least 10-100 μ

m, preferably 25-75 μ

m, of substrate material.