LIGHT EMITTING DEVICE PACKAGE AND BACKLIGHT UNIT COMPRISING THE SAME

• US 20140328083A1
• Filed: 11/16/2012
• Published: 11/06/2014
• Est. Priority Date: 11/17/2011
• Status: Active Grant

• Current Assignee: Lumens Co., Ltd.
• Original Assignee: Lumens Co., Ltd.
• Inventors: Lim, Jun Hyung, Oh, Seung Hyun, Kim, Pyoung Gug, Lee, Seung Hoon, Min, Chun Ki, Lim, Jung A, Jung, Cheol Hun, Chung, Bo Hyun
• Granted Patent: US 9,142,747 B2
• Time in Patent Office: Days
• US Class Current: 362/612
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• CPC Class Codes: G02B 6/0085 Means for removing heat created by the light source from the package heat extraction or cooling elements for semiconductor light sources in general H01L33/64
• CPC Class Codes: G02F 1/133614 using photoluminescence, e.g. phosphors illuminated by UV or blue light
• CPC Class Codes: G02F 1/133615 Edge-illuminating devices, i.e. illuminating from the side
• 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 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 2924/00014 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 2924/181 Encapsulation
• CPC Class Codes: H01L 33/486 adapted for surface mounting
• CPC Class Codes: H01L 33/54 having a particular shape
• 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

Abstract

Disclosed is a light emitting element package having excellent heat radiation performance and high luminance, and a backlight unit including the same. The light emitting element package includes a package including a lead frame, a light emitting element provided on the lead frame, and a molded material combined with the lead frame and having an opening for emitting light generated by the light emitting element, and a reflection structure having an opening corresponding to the opening of the molded material, and contacting the molded material.

Claims

1. A light emitting element package, comprising:

a lead frame;

a light emitting element on the lead frame;

a molded material combined with the lead frame and having an opening for emitting light generated by the light emitting element; and

a reflection structure having an opening that corresponds to the opening of the molded material and contacting the molded material.

2. The light emitting element package according to claim 1, wherein the reflection structure comprises:

a supporting portion contacting the molded material and provided continuously or discretely along a circumference of the opening of the molded material; and

a radial portion contacting the supporting portion and extending radially from the molded material relative to a direction along which light generated by the light emitting element emits.

3. The light emitting element package according to claim 1, wherein the molded material comprises a supporting portion provided continuously or discretely along a circumference of the opening of the molded material, and

wherein the reflection structure comprises a radial portion contacting the supporting portion and having a radial shape extending radially from the molded material relative to a direction along which light generated by the light emitting element emits.

4. The light emitting element package according to claim 1, wherein the molded material comprises a supporting portion provided continuously or discretely along a circumference of the opening of the molded material, and

wherein the reflection structure has a shape that corresponds to the supporting portion of the molded material, and contacts the molded material.

5. The light emitting element package according to claim 1, wherein recesses or concave and convex portions are provided on the molded material, and

wherein the reflection structure is fitted into the recesses or concave and convex portions.

6. The light emitting element package according to claim 1, further comprising an adhesive layer provided in at least part of a region between the molded material and the reflection structure to fix the reflection structure onto the molded material.

7. The light emitting element package according to claim 6, wherein the adhesive layer has a first thickness in an area adjacent to the light emitting element and a second thickness in an area away from the light emitting elements and wherein the first thickness is greater than the second thickness.

8. The light emitting element package according to claim 7, wherein the thickness of the adhesive layer is gradually reduced away from the light emitting element.

9. The light emitting element package according to claim 1, wherein the reflection structure comprises a radial surface formed in a radial shape extending radially from the molded material relative to a direction along which light generated by the light emitting element emits.

10. The light emitting element package according to claim 9, wherein the radial surface of the reflection structure forms a predetermined angle with a main emission direction of light generated by the light emitting element emits.

11. The light emitting element package according to claim 10, wherein the predetermined angle is equal to or greater than 10°

and equal to or less than 20°

.

12. The light emitting element package according to claim 9, wherein the radial surface of the reflection structure forms a first angle with a main emission direction of light generated by the light emitting element, from a point where the radial surface contacts the molded material to a first point away from the molded material, and forms a second angle with the main emission direction from the first point to a second point further away from the molded material compared to the first point, wherein the second angle is greater than the first angle.

13. The light emitting element package according to claim 9, further comprising a first resin layer that includes a fluorescent material and is provided in the opening of the molded material to cover the light emitting element.

14. The light emitting element package according to claim 13, further comprising a light-transmitting second resin layer that covers the first resin layer and contacts the radial surface.

15. The light emitting element package according to claim 9, further comprising:

a light-transmitting second resin layer provided in the opening of the molded material to cover the light emitting element; and

a first resin layer that includes a fluorescent material, covers the second resin layer, and contacts the radial surface.

16. The light emitting element package according to claim 1, wherein the reflection structure comprises metal.

17. The light emitting element package according to claim 1, wherein a surface of the supporting portion facing the opening of the molded material has a radial shape extending radially relative to a direction along which light generated by the light emitting element emits.

18. The light emitting element package according to claim 1, wherein part of the reflection structure is inserted into the opening of the molded material, and

Wherein the other part of the reflection structure, protruding from the opening of the molded material has a radial shape extending radially from the molded material relative to a direction along which light generated by the light emitting element emits.

20. A backlight unit, comprising:

a reflective sheet;

a light guide plate on or above the reflective sheet; and

a light emitting element package according to claim 1, configured to illuminate the light guide plate.

19. A light emitting element package, comprising:

a lead frame;

a light emitting element on the lead frame;

a molded material combined with the lead frame and having an opening for emitting light generated by the light emitting element;

a reflection structure having an opening that corresponds to the opening of the molded material, and contacting the molded material;

a supporting portion provided discretely or continuously on the molded material to fix the reflection structure onto the molded material; and

an adhesive layer provided in at least part of a region between the molded material and the reflection structure, and having a first thickness in an area adjacent to the light emitting element and a second thickness in an area away from the light emitting element, wherein the first thickness is greater than the second thickness.