Backlight unit, display device and manufacturing method of display device

1. A backlight unit comprising:

a light guide plate comprising an upper surface, a lower surface facing the upper surface, and a side surface which connects the upper surface with the lower surface;

a wavelength conversion member disposed on a surface of the light guide plate; and

a housing which houses the wavelength conversion member,

wherein the light guide plate and the housing are fused each other.

2. The backlight unit of claim 1 , wherein the housing is fused to the side surface of the light guide plate.

3. The backlight unit of claim 2 , wherein

the housing comprises a protrusion protruded from a side surface thereof,

wherein the protrusion is fused to the upper surface of the light guide plate.

4. The backlight unit of claim 2 , wherein the side surface of the light guide plate is in contact with the housing and the wavelength conversion member.

5. The backlight unit of claim 4 , wherein

a groove is defined on the side surface of the light guide plate,

wherein the wavelength conversion member is filled in the groove on the side surface of the light guide plate.

6. The backlight unit of claim 1 , wherein the housing is fused to the upper surface.

7. The backlight unit of claim 6 , further comprising:

a groove is defined on the upper surface of the light guide plate,

wherein the wavelength conversion member is filled in the groove on the upper surface of the light guide plate.

8. The backlight unit of claim 1 , wherein

the housing and the side surface of the light guide plate are directly in contact with each other to form a contact surface, and

a bonding portion of the housing and the light guide plate is formed on the contact surface.

9. The backlight unit of claim 8 , wherein the bonding portion comprises a plurality of bonding dots.

10. The backlight unit of claim 9 , wherein each of the bonding dots comprises a central region and a peripheral region disposed outside the central region.

11. The backlight unit of claim 10 , wherein a width of the central region is in a range of about 10 micrometers to about 20 micrometers.

12. The backlight unit of claim 11 , wherein a width of the peripheral region is in a range of about 70 micrometers to about 100 micrometers.

13. The backlight unit of claim 1 , wherein

a plurality of trenches is defined in the housing,

wherein the wavelength conversion member is filled in the trenches.

14. The backlight unit of claim 13 , wherein the housing comprises a cover glass which covers the trenches.

15. The backlight unit of claim 1 , wherein the light guide plate and the housing comprise a glass.

16. A display device comprising:

a backlight unit; and

a display panel disposed on the backlight unit,

wherein the backlight unit comprises:

a light guide plate comprising an upper surface, a lower surface facing the upper surface, and a side surface which connects the upper surface with the lower surface;

a wavelength conversion member disposed on a surface of the light guide plate; and

a housing which houses the wavelength conversion member, wherein the light guide plate and the housing are fused each other.

17. The display device of claim 16 , wherein the housing is bonded to the display panel.

18. The display device of claim 17 , wherein

the housing comprises a first protrusion protruded from a surface thereof,

wherein the first protrusion is fused to the display panel.

19. The display device of claim 18 , wherein

the housing further comprises a second protrusion protruded from an opposing surface thereof, which is opposite to the surface,

wherein the second protrusion is fused to the display panel.

20. The display device of claim 16 , wherein the light guide plate is fused to the display panel.

21. The display device of claim 16 , wherein

the housing is fused to the upper surface of the light guide plate, and

the display panel is fused to the housing.