Backlight unit and display apparatus having the same
A display apparatus including a display panel, a light source unit configured to provide light to the display panel, and a light guide member disposed between the display panel and the light source unit and covering the light source unit such that the light source unit is buried in the light guide member, the light guide member having a surface roughness on an upper surface thereof to diffuse light and including a substrate, and a light emitting device disposed on the substrate and including a blocking pattern to have an intensity of light emitted in an upward direction to be equal to or less than about 80% of a maximum light intensity of the light emitting device.
1. A display apparatus comprising:
a display panel;
a light source unit configured to provide light to the display panel; and
a light guide member disposed between the display panel and the light source unit and covering the light source unit such that the light source unit is buried in the light guide member, the light guide member having a surface roughness on an upper surface thereof to diffuse light,
wherein the light source unit includes:
a substrate; and
a light emitting device disposed on the substrate and including a blocking pattern to have an intensity of light emitted in an upward direction to be equal to or less than 80% of a maximum light intensity of the light emitting device, and
wherein the light emitting device comprises:
a device substrate having a first surface and a second surface;
a light emitting stacked structure disposed on the second surface; and
a first blocking pattern of the blocking pattern disposed on the first surface.
2. The display apparatus of claim 1 , wherein the intensity of light emitted in the upward direction is equal to or less than 50% of the maximum light intensity of the light emitting device.
3. The display apparatus of claim 1 , wherein a distance from an upper surface of the substrate to an upper surface of the light guide member is equal to or less than 400 micrometers.
4. The display apparatus of claim 1 , wherein the blocking pattern further comprises a second blocking pattern covering an upper surface of the light emitting stacked structure.
5. The display apparatus of claim 4 , wherein each of the first and second blocking patterns comprises a distributed Bragg reflector (DBR) dielectric mirror.
6. The display apparatus of claim 4 , wherein the first blocking pattern comprises a dielectric mirror to block blue light and yellow light.
7. The display apparatus of claim 4 , wherein the second blocking pattern comprises a dielectric mirror to block blue light.
8. The display apparatus of claim 1 , wherein the light emitting device has a first light profile in a first length direction and a second light profile different from the first light profile in a second length direction crossing the first length direction.
9. The display apparatus of claim 8 , wherein:
the light emitting device further comprises a first contact electrode and a second contact electrode;
the substrate comprises a first pad electrode electrically connected to the first contact electrode with a first solder interposed therebetween, and a second pad electrode electrically connected to the second contact electrode with a second solder interposed therebetween; and
the first and second pad electrodes are spaced apart from each other by at least 50 micrometers.
10. The display apparatus of claim 1 , wherein the light emitting device is provided in plural, and the light emitting devices are arranged on the substrate in a matrix form.
11. The display apparatus of claim 10 , wherein the light emitting devices are spaced apart from each other at a first pitch in a first direction and are spaced apart from each other at a second pitch different from the first pitch in a second direction substantially perpendicular to the first direction.
12. The display apparatus of claim 11 , wherein a distance between an edge of the substrate and the light emitting device closest to the edge is equal to or greater than 1 mm.
13. The display apparatus of claim 1 , further comprising an optical sheet disposed between the light source unit and the display panel.
14. The display apparatus of claim 1 , wherein the light guide member comprises a silicone resin.
15. The display apparatus of claim 14 , wherein the light guide member comprises light scattering particles distributed in the silicone resin.
16. The display apparatus of claim 1 , wherein the light emitting device is configured to emit blue light.
17. The display apparatus of claim 16 , further comprising a light conversion film disposed between the light source unit and the display panel to convert a wavelength band of light emitted from the light emitting device.
18. The display apparatus of claim 17 , wherein the light conversion film comprises at least one of a quantum dot and a fluorescent substance.
19. A backlight unit comprising:
a light source unit configured to emit light; and
a light guide member disposed on the light source unit and covering the light source unit such that the light source unit is buried in the light guide member, the light source unit having a surface roughness on an upper surface thereof to diffuse light,
wherein the light source unit includes:
a substrate; and
a light emitting device disposed on the substrate and including a blocking pattern to have an intensity of light emitted in an upward direction to be equal to or less than 80% of a maximum light intensity of the light emitting device, and
wherein the light emitting device comprises:
a device substrate having a first surface and a second surface;
a light emitting stacked structure disposed on the second surface; and
a first blocking pattern of the blocking pattern disposed on the first surface.