Light emitting device

• US 10,340,433 B2
• Filed: 01/19/2016
• Issued: 07/02/2019
• Est. Priority Date: 01/19/2015
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Lee, Tae Sung, Kong, Sung Min, Ryu, Young Min, Jung, Jae Hwan, Choi, Jong Beom
• Primary Examiner(s): Loke, Steven H
• Assistant Examiner(s): Rhodes, Juanita B
• Application Number:
  US15/544,495
• Publication Number:
  US 20180019386A1
• Time in Patent Office: 1,260 Days
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• 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 33/486 adapted for surface mounting
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin
• 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 33/647 the elements conducting electric current to or from the semiconductor body

Abstract

A light-emitting element disclosed in an embodiment comprises: a body having a cavity; first and second lead frames arranged in the cavity; a third lead frame arranged between the first and second lead frames in the cavity; a fourth lead frame arranged between the first and second lead frames and distanced from the third frame in the cavity; a first light-emitting chip arranged on the first lead frame; and a second light-emitting chip arranged on the second lead frame, wherein the body comprises: first and second sides arranged on opposing sides from each other; and third and fourth sides arranged on opposing sides from each other, the first lead frame comprises first and second lead parts protruding toward the first and second sides, the second lead frame comprises third and forth lead parts protruding toward the first and second sides, the third frame comprises a fifth lead part protruding toward the first side, and the fourth lead frame comprises a sixth lead part protruding toward the second side.

Claims

1. A light emitting device comprising:

a body having a cavity;

first and second lead frames disposed in the cavity;

a third lead frame disposed in the cavity and disposed between the first and second lead frames;

a fourth lead frame disposed in the cavity, disposed between the first and second lead frames, and spaced apart from the third lead frame;

a first light emitting chip disposed on the first lead frame; and

a second light emitting chip disposed on the second lead frame,

wherein the body includes;

first and second lateral sides disposed in opposition to each other; and

third and fourth lateral sides disposed in opposition to each other,

wherein the first lead frame includes a first lead part protruding through the first lateral side of the body and a second lead part protruding through the second lateral side of the body,

wherein the second lead frame includes a third lead part protruding through the first lateral side of the body and a fourth lead part protruding through the second lateral side of the body,

wherein the third lead frame includes a fifth lead part protruding through the first lateral side of the body,

wherein the fourth lead frame includes a sixth lead part protruding through the second lateral side of the body,

wherein top surfaces of the first, second, third and fourth lead frames are disposed on a bottom of the cavity,

wherein respective bottom surfaces of each of the first, second, third and fourth lead frames are exposed to a bottom of the body,

wherein, in the body, the first and second lateral sides have respective lengths longer than respective lengths of the third and fourth lateral sides,

wherein the fifth lead part of the third lead frame is disposed between the first lead part of the first lead frame and the third lead part of the second lead frame,

wherein the sixth lead part of the fourth lead frame is disposed between the second lead part of the first lead frame and the fourth lead part of the second lead frame,

wherein the first light emitting chip is electrically connected with the first and third lead frames,

wherein the second light emitting chip is electrically connected with the second and fourth lead frames, and

wherein the first and second light emitting chips are individually driven.

2. The light emitting device of claim 1, further comprising:

a first connection member connected with the first light emitting chip and the third lead frame;

a second connection member connected with the second light emitting chip and the fourth lead frame;

a first protective chip disposed on the third lead frame; and

a third connection member connected with the first protective chip and the first lead frame.

3. The light emitting device of claim 2, further comprising:

a second protective chip disposed on the fourth lead frame; and

a fourth connection member connected with the second protective chip and the second lead frame.

4. The light emitting device of claim 3, further comprising:

a protrusion part disposed in the cavity of the body and protruding from the body toward a top portion of the cavity at a region between the third and fourth lead frames,

wherein an upper portion of the protrusion part is provided over top surfaces of the third and fourth lead frames,

wherein the protrusion part is formed of a material of the body, and

wherein the protrusion part is disposed between the first light emitting chip and the second light emitting chip.

5. The light emitting device of claim 4, wherein the body includes a spacer part disposed in respective regions between the first lead frame and the third and fourth lead frames and respective regions between the second lead frame and the third and fourth lead frames,

wherein the spacer part includes:

a first spacer part disposed in a region between the first lead frame and the third and fourth lead frames; and

a second spacer part disposed in a region between the second lead frame and the third and fourth lead frames,

wherein the protrusion part is disposed in a region between the first and second spacer parts,

wherein the cavity includes a first wall adjacent to the first lateral side of the body and a second wall adjacent to the second lateral side of the body, and

wherein the first wall adjacent to the first lateral side of the body and the second wall adjacent to the second lateral side of the body have a curved surface corresponding to the protrusion part.

6. The light emitting device of claim 5, wherein the first and second spacer parts include first and second reflective parts protruding upward higher than respective top surfaces of each of the first to fourth lead frames.

7. The light emitting device of claim 1, wherein respective outer regions of each of the first to fourth lead frames have respective stepped structures coupled to portions of the body.

8. The light emitting device of claim 7, wherein the first lead frame includes a plurality of holes disposed adjacent to the first and second lateral sides of the body and having stepped structures,

wherein the second lead frame includes a plurality of holes disposed adjacent to the first and second lateral sides of the body and having stepped structures,

wherein a distance between the plurality of holes of the first lead frame is wider than a width of the first light emitting chip,

wherein a distance between the plurality of holes of the second lead frame is wider than a width of the second light emitting chip, and

wherein the plurality of holes of the first lead frame and the plurality of holes of the second lead frame are coupled to the body.

9. The light emitting device of claim 1, wherein the respective lengths of the first and second lateral sides of the body range from 1.3 times to 2 times the respective lengths of the third and fourth lateral sides of the body,

wherein the body includes a protrusion part disposed in the cavity,

wherein the protrusion part is protruded toward a top portion of the cavity from a region between the third and fourth lead frames,

wherein the cavity includes a first wall adjacent to the first lateral side of the body and a second wall adjacent to the second lateral side of the body, and

wherein the first wall adjacent to the first lateral side of the body and the second wall adjacent to the second lateral side of the body have a curved surface corresponding to a rounded surface of the protrusion part.

10. The light emitting device of claim 1, further comprising:

a first phosphor film disposed on the first light emitting chip;

a second phosphor film disposed on the second light emitting chip; and

a molding member in the cavity.

11. The light emitting device of claim 1, wherein the first to fourth lead frames each have bottom surfaces disposed on a same horizontal plane as the bottom of the body.

12. The light emitting device of claim 1, wherein each of the first to fourth lead frames has a bottom surface having a width smaller than a width of a respective top surface of each of the first to fourth lead frames.

13. A light emitting device comprising:

a body having a cavity;

first and second lead frames disposed in the cavity;

third and fourth lead frames disposed in the cavity and arranged in line with each other between the first and second lead frames;

a first light emitting chip disposed on the first lead frame;

a second light emitting chip disposed on the second lead frame;

a first protective chip disposed on the third lead frame; and

a second protective chip disposed on the fourth lead frame,

wherein each of the first and second lead frames includes a plurality of lead parts protruding through first and second lateral sides of the body,

wherein each of the third and fourth lead frames includes a lead part protruding through the first or second lateral side of the body,

wherein the lead part of the third lead frame protrudes in a direction opposite to a direction that the lead part of the fourth lead frame protrudes,

wherein the body includes third and fourth lateral sides of the body having a smaller length than a length of the first and second lateral sides of the body,

wherein the respective length of the first and second lateral sides of the body is a length in a first direction of the body,

wherein the respective length of the third and fourth lateral sides of the body is a length in a second direction of the body,

wherein the first and second lateral sides of the body are disposed in opposition to each other, and the third and fourth lateral sides of the body are disposed in opposition to each other,

wherein top surfaces of the first, second, third and fourth lead frames are disposed on a bottom of the cavity, and

wherein respective bottom surfaces of each of the first, second, third and fourth lead frames are exposed to a bottom of the body.

14. The light emitting device of claim 13, wherein the lead part of the third lead frame is disposed between the lead part of the plurality of lead parts of the first lead frame and the lead part of the plurality of lead parts of the second lead frame at the first lateral side of the body.

15. The light emitting device of claim 14, wherein the lead part of the fourth lead frame is disposed between the lead part of the plurality of lead parts of the first lead frame and the lead part of the plurality of lead parts of the second lead frame at the second lateral side of the body.

16. The light emitting device of claim 15, wherein the first, second, and third lead frames are disposed in parallel to each other between the third and fourth lateral sides of the body in the second direction.

17. The light emitting device of claim 16, further comprising:

a first phosphor film disposed on the first light emitting chip;

a second phosphor film disposed on the second light emitting chip; and

a molding member in the cavity,

wherein the first light emitting chip is electrically connected with the first and third lead frames,

wherein the second light emitting chip is electrically connected with the second and fourth lead frames,

wherein the first and second light emitting chips are individually driven, and

wherein the first and second phosphors films have mutually different phosphors.