Light source module and backlight unit having the same

Patent metadata

Field	Value
Publication number	US-11848405-B2
Application number	US-202117357413-A
Country	US
Kind code	B2
Filing date	Jun 24, 2021
Priority date	May 9, 2013
Publication date	Dec 19, 2023
Grant date	Dec 19, 2023

Abstract

A backlight unit includes one or more light sources operable to emit light and a light guide plate arranged adjacent to the one or more light sources, reflected lights exiting the one or more light sources via the second surfaces and entering the light guide plate. A light source includes a light emitting device having a substrate and a semiconductor stack disposed on the substrate. The reflector is structured and positioned to block light emitted from a first surface of the light emitting device by reflecting the light emitted from the first surface toward second surfaces of the light source.

First claim

What is claimed is:

1. A backlight unit comprising:
light sources operable to emit light, each light source comprising:
a light emitting device comprising a substrate and a semiconductor stack disposed on the substrate; and
a reflector structured and positioned to block light emitted from a first surface of the light emitting device by reflecting the light emitted from the first surface toward second surfaces of a corresponding light source;

wherein the light sources are arranged side by side and spaced apart from each other such that reflectors of the light sources are spaced apart by a predetermined distance from each other; and
a light guide plate arranged adjacent to the light sources, reflected lights exiting the light sources via the second surfaces and entering the light guide plate.

2. The backlight unit of claim 1 , wherein the reflector is further structured and positioned to guide the reflected light toward the second surfaces of the light source such that the reflected light is collected on the second surfaces of the light source.

3. The backlight unit of claim 1 , further comprising a wavelength conversion layer covering the light emitting device, wherein the wavelength conversion layer covers an upper surface and side surfaces of the light emitting device.

4. The backlight unit of claim 3 , wherein the reflector is disposed on the wavelength conversion layer and above an upper surface of the light emitting device, the reflector spaced apart from the first surface of the light emitting device.

5. The backlight unit of claim 1 , wherein:
the reflector is positioned to uncover the second surfaces of the light source; and
the reflector is further positioned to be in parallel to at least one surface of the light emitting device.

6. The backlight unit of claim 1 , wherein the reflector further comprises a resin coated with a reflective layer.

7. The backlight unit of claim 1 , wherein the reflector further comprises a resin including a reflective material.

8. A light module provided in a backlight unit, wherein the light module includes a light source configured to emit light and comprises:
a light emitting device comprising a substrate and a semiconductor stack disposed on the substrate;
one or more electrode pads electrically connected to the light emitting device; and
a reflector disposed relative to and spaced apart from an upper side of the light emitting device, the reflector structured and positioned to block light emitted from a first surface of the light emitting device by reflecting the light emitted from the first surface toward second surfaces of the light source;
wherein the first surface of the light emitting device is a light emitting surface and the second surfaces of the light source is a light exiting surface, and
wherein the light module includes an additional light emitting device and the reflector of the light emitting device and a reflector of the additional light emitting device are separated from each other by a predetermined distance.

9. The light module of claim 8 , wherein the reflector further comprises a resin coated with a reflective layer.

10. The light module of claim 8 , wherein the reflector further comprises a resin including a reflective layer.

11. The light module of claim 10 , wherein the reflective layer is further disposed above the upper side of the light emitting device and guides reflected light toward the second surfaces of the light module.

12. The light module of claim 11 , wherein the second surfaces of the light module include side surfaces of the light module.

13. A light module provided in a backlight unit, wherein the light module includes a light configured to emit light and comprises:
a light emitting device comprising a substrate and a semiconductor stack disposed on the substrate; and
one or more electrode pads electrically connected to the light emitting device;
a resin;
a reflective layer coated on the resin, the reflective layer disposed relative to and spaced apart from an upper side of the light emitting device, the reflective layer structured and positioned to block light emitted from a light emitting surface of the light emitting device by reflecting the light emitted from the light emitting surface toward a light exiting surface of the light, and
wherein the light module includes an additional light emitting device and the reflective layer of the light emitting device and a reflective layer of the additional light emitting device are separated from each other by a predetermined distance.

14. The light module of claim 13 , wherein the reflective layer is further disposed above the upper side of the light emitting device.

15. The light module of claim 14 , wherein the reflective layer guides reflected light toward the light exiting surface of the light module.

16. The light module of claim 13 , wherein the light exiting surface of the light module includes a side surface of the light module.

17. A display device comprising:
a display panel on which an image is displayed;
a backlight unit emitting light and disposed in a position to provide emitted light to the display panel; and
a frame supporting the display panel and receiving the backlight unit;
wherein the backlight unit comprises light sources operable to emit light, a light comprising:
a light emitting source comprising a substrate and a semiconductor stack disposed on the substrate; and
a reflector structured and positioned to block light emitted from a first surface of the light emitting source by reflecting the light emitted from the first surface toward second surfaces of the light;
wherein the light sources are arranged side by side and spaced apart distance from each other such that reflectors of the light sources are spaced apart by a predetermined distance from each other;
a light guide plate arranged adjacent to the light sources, reflected lights exiting the light sources via the second surfaces and entering the light guide plate.

18. The display device of claim 17 , wherein:
the reflector is positioned to uncover the second surfaces of the light; and
the reflector is further positioned to be in parallel to at least one surface of the light emitting source.

19. The display device of claim 17 , wherein the reflector further comprises a resin coated with a reflective layer.

20. The display device of claim 17 , wherein the reflector further comprises a resin including a reflective material.

Assignees

• Seoul Semiconductor Co Ltd

Inventors

• Song Young Jun
• Kim Da Hye
• Jung Seoung Ho

Classifications

• H10H20/856

  Reflecting means · CPC title

• H10H20/8514 Primary

  characterised by their shape, e.g. plate or foil · CPC title

• H01L33/505 Primary

  Electricity · mapped topic

• G02B6/0073 Primary

  Light emitting diode [LED] · CPC title

• H01L33/60

  Electricity · mapped topic