Unit pixel having light emitting device, pixel module and displaying apparatus
A unit pixel including a transparent substrate, a plurality of light emitting devices arranged on the transparent substrate, an adhesive layer bonding the light emitting devices to the transparent substrate, a step adjusting layer covering the light emitting device and bonded to the adhesive layer, a plurality of connection layers disposed on the step adjustment layer and electrically connected to the light emitting devices, in which the step adjustment layer has a concave-convex pattern along an edge thereof.
1. A displaying apparatus, comprising:
a panel substrate; and
a plurality of pixel modules arranged on the panel substrate, each of the pixel modules including:
a circuit board;
a plurality of unit pixels disposed on the circuit board; and
a cover layer covering the unit pixels,
wherein:
each of the unit pixels includes:
a transparent substrate;
a plurality of light emitting devices longitudinally extending along a first direction and arranged on the transparent substrate;
an adhesive layer bonding the light emitting devices to the transparent substrate;
a step adjustment layer covering the light emitting device and bonded to the adhesive layer; and
a plurality of connection layers disposed on the step adjustment layer and electrically connected to the light emitting devices; and
the light emitting devices in the unit pixel are arranged in a second direction crossing the first direction.
2. The displaying apparatus of claim 1 , wherein:
the light emitting devices include at least three light emitting devices configured to emit light having different peak wavelength; and
the at least three light emitting devices are arranged in a line.
3. The displaying apparatus of claim 1 , wherein the light emitting devices are configured to emit red, green and blue light, respectively.
4. The displaying apparatus of claim 1 , wherein:
each of the light emitting devices includes:
a light emitting structure including a first conductivity type semiconductor layer, a second conductivity type semiconductor layer, and an active layer interposed between the first and second conductivity type semiconductor layers; and
a first electrode pad and a second electrode pad disposed on the light emitting structure;
the step adjustment layer has openings exposing the first and second electrode pads; and
the connection layers are electrically connected to the first and second electrode pads through the openings of the step adjustment layer.
5. The displaying apparatus of claim 1 , further comprising a light blocking layer disposed between the adhesive layer and the transparent substrate, the light blocking layer including a window region to transmit light generated in the light emitting device.
6. The displaying apparatus of claim 5 , wherein the width of the window region is narrower than that of the light emitting device.
7. The displaying apparatus of claim 1 , further comprising a protection layer covering the step adjustment layer and the connection layers,
wherein the protection layer has openings formed on the connection layers.
8. The displaying apparatus of claim 7 , further comprising a plurality of bumps disposed in the openings of the protection layer,
wherein the bumps are electrically connected to the connection layers, respectively.
9. The displaying apparatus of claim 7 , further comprising a bonding material bonding the light emitting devices and the circuit board.
10. The displaying apparatus of claim 9 , wherein the bonding material fills at least a portion of the openings of the protection layer.
11. The displaying apparatus of claim 7 , further comprising a bonding material bonding the light emitting devices and the circuit board,
wherein:
the unit pixel further includes a plurality of bumps disposed in the openings of the protection layer;
the circuit board includes a plurality of pads exposed on an upper surface thereof; and
the bonding material bonds the bumps with the pads.
12. The displaying apparatus of claim 11 , wherein:
the circuit board further includes a plurality of bottom pads disposed on a bottom thereof; and
the number of the bottom pads is less than that of the pads.
13. The displaying apparatus of claim 1 , wherein the transparent substrate includes a concave-convex member on a light emitting surface.
14. The displaying apparatus of claim 1 , wherein the transparent substrate includes an anti-reflection coating, an antiglare layer, or a portion of antiglare region.
15. The displaying apparatus of claim 1 , wherein the adhesive layer is formed of a light transmissive layer and includes a diffuser to diffuse light.
16. The displaying apparatus of claim 7 , wherein the protection layer is formed of a light absorbing material to prevent light leakage.
17. The displaying apparatus of claim 16 , wherein the light absorbing material includes at least one of white reflective material or a black epoxy.
18. The displaying apparatus of claim 12 , at least one of the bottom pads is commonly connected to cathodes of the light emitting devices in each unit pixel.
19. The displaying apparatus of claim 12 , at least one of the bottom pads is commonly connected to anodes of the light emitting devices in each unit pixel.
20. The displaying apparatus of claim 12 , at least one of the bottom pads is connected to anodes of the two light emitting device having the same color range.