Light emitting device and manufacturing method thereof

• US 8,853,730 B2
• Filed: 08/31/2007
• Issued: 10/07/2014
• Est. Priority Date: 09/04/2006
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Park, Bo Geun
• Primary Examiner(s): Li, Meiya
• Application Number:
  US11/849,097
• Publication Number:
  US 20080054285A1
• Time in Patent Office: 2,594 Days
• Field of Search: 257/98, 257/99, 257/667, 257/668, 257/E21.002, 257/E33.059, 257/E33.061, 438/27, 174/523
• US Class Current: 257/99
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/49107 on the semiconductor or solid-state body
• 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 2933/005 relating to encapsulations
• CPC Class Codes: H01L 2933/0058 relating to optical field-shaping elements
• CPC Class Codes: H01L 33/30 containing only elements of Group III and Group V of the Periodic Table
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H01L 33/58 Optical field-shaping 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

A light emitting device comprises a substrate including a top surface that is flat, a light emitting diode on the substrate, a lead frame formed on the flat top surface of the substrate. The lead frame includes a circuit with a predetermined pattern to electrically connect to the light emitting diode. A dam part is formed on the substrate and is adjacent to the light emitting diode. A first member is formed on the light emitting diode, the first member including a fluorescent substance to convert a light emission spectrum of light from the light emitting diode. A second member is surrounded by the dam part and is formed on the substrate adjacent to the first member, and a lens covers the first member, the second member and the light emitting diode.

Claims

1. A light emitting device comprising:

a substrate including an entire top surface that is flat;

a light emitting diode on the substrate;

a lead frame formed on the flat top surface of the substrate, the lead frame electrically connected to the light emitting diode;

a dam part formed on the substrate and being adjacent to the light emitting diode;

a first member formed on the light emitting diode, the first member including a fluorescent substance to convert a light emission spectrum of light from the light emitting diode;

a second member being surrounded by the dam part and formed on the substrate adjacent to the first member; and

a lens covering the first member, the second member and the light emitting diode,

wherein a distance from an uppermost surface of the dam part to a top surface of the substrate is less than a distance from an uppermost surface of the first member to the top surface of the substrate,

the dam part is in a circle shape and has an opening,

at least a portion of the dam part has a vertical inner surface that contacts the second member,

a width of the substrate is greater than a width of the dam part so that the substrate extends beyond the dam part,

the lead frame includes a portion that is disposed on the substrate and extending beyond the darn part, and

an outer side of the lens does not extend beyond the dam part.

2. The light emitting device as claimed in claim 1, wherein at least one of the first member and the second member comprises epoxy or silicone.

3. The light emitting device as claimed in claim 1, wherein the lens comprises a hemispherical convex shape.

4. The light emitting device as claimed in claim 1, wherein the second member has a substantially flat top surface.

5. A light emitting device comprising:

a substrate including an entire top surface that is flat;

a light emitting diode on the substrate;

a lead frame formed on the flat top surface of the substrate, the lead frame electrically connected to the light emitting diode;

a dam part formed on the substrate and being adjacent to the light emitting diode;

a first member formed on the light emitting diode, the first member including a fluorescent substance to convert a light emission spectrum of light from the light emitting diode;

a second member being surrounded by the dam part and formed above the first member and the light emitting diode; and

a lens covering the first member, the second member and the light emitting diode,

wherein the dam part is in a circle shape and has an opening,

at least a portion of the dam part has a vertical inner surface that contacts the second member,

a width of the substrate is greater than a width of the dam part so that the substrate extends beyond the dam part,

the lead frame includes a portion that is disposed on the substrate and extending beyond the dam part,

an outer side of the lens does not extend beyond the dam part,

the outer side of the lens is aligned with the vertical inner surface of the at least one portion of the dam part, and

both a bottom surface of the dam art and a bottom surface of the second member are substantially at the same horizontal plane.

6. The light emitting device as claimed in claim 5, wherein the lens adheres to a top surface of the second member.

7. The light emitting device as claimed in claim 6, wherein the lead frame is interposed between the substrate and the dam part such that both the substrate and the dam part are separate from each other.

8. The light emitting device as claimed in claim 6, wherein the second member comprises a material substantially identical to a material of the lens so as to have an optical characteristic similar to the lens.

9. The light emitting device as claimed in claim 6, the top surface of the second member and a bottom surface of the lens have a substantially same area.

10. The light emitting device as claimed in claim 5, wherein the lens comprises a hemispherical convex shape.

11. The light emitting device as claimed in claim 5, wherein the second member has a substantially flat top surface.

12. The light emitting device as claimed in claim 11, wherein the lead frame is interposed between the substrate and the darn part such that both the substrate and the dam part are separate from each other.

13. The light emitting device as claimed in claim 11, wherein the second member comprises a material substantially identical to a material of the lens so as to have an optical characteristic similar to the lens.

14. The light emitting device as claimed in claim 11, wherein the substantially flat top surface of the second member and a bottom surface of the lens have a substantially same area.

15. The light emitting device as claimed in claim 5, wherein the lead frame is interposed between the substrate and the dam part such that both the substrate and the dam part are separate from each other.

16. The light emitting device as claimed in claim 5, wherein the second member comprises a material substantially identical to a material of the lens so as to have an optical characteristic similar to the lens.

17. The light emitting device as claimed in claim 5, wherein an upper surface of the second member and a bottom surface of the lens have a substantially same area.

18. The light emitting device as claimed in claim 5, wherein the first member is formed in the form of a convex lens to cover the light emitting diode.

19. The light emitting device as claimed in claim 5, wherein the bottom surface of the second member and a bottom surface of the light emitting diode are substantially disposed at the same horizontal plane.

20. The light emitting device as claimed in claim 5, wherein a width of the second member and a width of the lens are substantially the same.

21. The light emitting device as claimed in claim 5, wherein a width of the opening and a width of the second member are substantially the same.

22. The light emitting device as claimed in claim 5, wherein the bottom surface of the second member is disposed lower than a top surface of the light emitting diode.