Light emitting device package and backlight unit using the same

• US 20070070530A1
• Filed: 09/26/2006
• Published: 03/29/2007
• Est. Priority Date: 09/27/2005
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: LG Innotek Company Limited (LG Corporation), LG ELECTRONICS INC. AND LG INNOTEK CO., LTD
• Inventors: Seo, Jung, Jang, Jun
• Granted Patent: US 8,911,160 B2
• Time in Patent Office: Days
• US Class Current: 359/819
• CPC Class Codes: F21K 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 1/133607 the light controlling member including light directing or refracting elements, e.g. prisms or lenses
• CPC Class Codes: G02F 1/133611 including means for improving the brightness uniformity
• 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 2924/1815 Shape
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin
• CPC Class Codes: H01L 33/58 Optical field-shaping elements

Abstract

An light emitting device package and a backlight unit using the same are disclosed, wherein light advancing upward from the light emitting device package can be refracted by a lens to enable the light having a uniform intensity to be emitted upwards to the advantage of efficiency and power consumption, even with a small number of light emitting devices.

Claims

1. A light emitting device package comprising:

a body including a surface on which at least one light emitting device is mounted; and

at least one optical lens on the surface of the body and covering the light emitting device, wherein the optical lens includes a refractive medium to refract light emitted from the light emitting device and passing through the refractive medium, and further includes a recess thereon.

2. The package as defined in claim 1, wherein the body includes a mounting plate, the package further comprising:

a plurality of leads each spaced a predetermined distance apart from the mounting plate;

a plurality of light emitting devices on a surface of the mounting plate;

connectors electrically connecting the plurality of light emitting devices to the plurality of leads; and

a mold encompassing the plurality of light emitting devices and parts of the plurality of leads.

3. The package as defined in claim 1, wherein the body includes a mounting plate having a plurality of extended leads, the package further comprising:

a plurality of leads each spaced a predetermined distance apart from the mounting plate;

a plurality of light emitting devices on a surface of the mounting plate;

connectors electrically connecting the plurality of light emitting devices to the plurality of leads, each spaced a predetermined distance apart from the mounting plate; and

a mold encompassing the plurality of light emitting devices and parts of the plurality of leads.

4. The package as defined in claim 1, wherein the body a heat sink;

the at least light emitting device on an upper surface of the heat sink;

leads electrically connected to the at least one light emitting device; and

a mold encompassing the at least one light emitting device and parts of the leads while exposing a bottom surface of the heat sink.

5. The package as defined in claim 1, wherein a surface of at least one optical lens is curved or includes a curve and an inclination.

10. The backlight unit as defined in claim 9, wherein each of the packages comprises:

a mounting plate;

a plurality of leads each spaced a predetermined distance apart from the mounting plate;

the plurality of light emitting devices on to a surface of the mounting plate;

conductors electrically connecting the plurality of light emitting devices to the plurality of leads; and

a mold encompassing the plurality of light emitting devices and parts of the plurality of leads.

13. The backlight unit as defined in claim 10, wherein the plurality of optical lens are integrally formed with the mold and are molded with the same material as that of the mold.

11. The backlight unit as defined in claim 9, wherein each of the packages comprises:

a mounting plate disposed with a plurality of extended leads;

a plurality of leads each spaced a predetermined distance apart from the mounting plate;

the plurality of light emitting devices on a surface of the mounting plate;

conductors electrically connecting the plurality of light emitting devices to the plurality of leads, each spaced a predetermined distance apart from the mounting plate; and

a mold encompassing the plurality of light emitting devices and parts of the plurality of leads.

12. The backlight unit as defined in claim 8, wherein a surface of the plurality of optical lenses is curved or includes a curve and an inclination.

14. The backlight unit as defined in claim 8 further comprising at least one driving unit to drive at least one package.

15. The backlight unit as defined in claim 9, wherein each of the packages comprises:

a mounting plate on which four light emitting devices are mounted thereon where a first row is arrayed with a red light emitting device, and a green light emitting device, while a second row is arrayed with a green light emitting device and a blue light emitting device.

16. The backlight unit as defined in claim 9, wherein each of the packages comprises:

a mounting plate on which three light emitting devices are fabricated thereon, where a first row is arrayed with a red light emitting device, and a second row is arrayed with a green light emitting device and a blue light emitting device.

17. The backlight unit as defined in claim 9, wherein each of the light emitting devices is spaced in series a predetermined distance apart and a mounting plated of a package, and a recess is formed at an upper surface of the optical lens of the light emitting device packages.

18. A backlight unit comprising:

a substrate;

a plurality of light emitting device packages mounted on a surface of the substrate;

a film formed with a surface, wherein the film refracts light radiated from the plurality of light emitting device packages and passing through the film, and also formed on the film are a plurality of optical lens formations, each disposed with a recess and positioned on each surface of the packages; and

a diffusion plate disposed above the film.

19. The backlight unit as defined in claim 18, wherein each of the light emitting device packages is packaged with a plurality of light emitting devices.

20. The backlight unit as defined in claim 18, wherein each optical lens formation on each of the light emitting device packages is formed with a recess.