Display device and method of fabricating the same

1 . A display device, comprising:

an adhesive layer on a substrate;

a plurality of pixels on the substrate;

a light emitting diode disposed on the adhesive layer and within each respective pixel of the plurality of pixels, the light-emitting diode including a first electrode connected an anode electrode and a second electrode connected a cathode electrode;

a thin-film transistor connected the anode electrode;

a common line applying a common voltage to the light-emitting diode;

a planarization layer surrounding the light-emitting diode and including a first planarization layer on a thin-film transistor and the adhesive layer, and a second planarization layer on the first planarization layer;

a bank disposed on the planarization layer and configured to prevent light emitted from the light-emitting diode from being transmitted to adjacent pixels of the plurality of pixels; and

a reflective optical structure covering a side surface of the bank; and

a protective layer on an upper surface of the bank,

wherein;

the thin-film transistor is connected to the anode electrode through a first contact hole of the first planarization layer and the second planarization layer and is electrically connected to the first electrode of the light emitting diode through the anode electrode, wherein

the common line is connected to the cathode electrode through a second contact hole of the first planarization layer and the second planarization layer, and wherein

the common line is electrically connected to the second electrode of the light emitting diode through the cathode electrode; and

the reflective optical structure directly contacts and covers the side surface of the bank and at least a part of an upper surface of the protective layer.

2 . The display device of claim 1 , wherein the first contact hole and the second contact hole are each filled with the bank containing a light absorbing material.

3 . The display device of claim 1 , wherein the reflective optical structure includes a first optical layer adjacent to the anode electrode and a second optical layer adjacent to the cathode electrode, and

the first optical layer is electrically connected to the first electrode of the light emitting diode.

4 . The display device of claim 3 , wherein the reflective optical structure includes at least one of silver or aluminum.

5 . The display device of claim 1 , wherein the reflective optical structure further includes a portion between the light emitting diode and the bank in a plane view, and

the portion of the reflective optical structure is non-overlapping with the light emitting diode.

6 . The display device of claim 1 , further comprising a reflective layer disposed under the light emitting diode and configured to reflect light emitted from the light-emitting diode toward an image display side of the display device, and

wherein the adhesive layer is between the light emitting diode and the reflective layer.

7 . The display device of claim 1 , wherein the protective layer has a side surface aligned with the side surface of the bank along a direction perpendicular to the upper surface of the bank.

8 . The display device of claim 1 , wherein the protective layer includes at least one of a metal, silicon oxide, silicon nitride, amorphous silicon and a material having a different etch selectivity from a material of the bank.

9 . The display device of claim 1 , wherein the reflective optical structure includes a first portion on an upper surface of the bank, a second portion on the side surface of the bank, and a third portion between the light emitting diode and the bank in a plane view.

10 . The display device of claim 9 , wherein the reflective optical structure is an integral structure having the first and third portions extending from respective opposite ends of the second portion,

the first portion and the third portion of the reflective optical structure extend parallel to each other, and

the second portion and the third portion of the reflective optical structure extend perpendicular to each other.

11 . The display device of claim 1 , wherein the reflective optical structure has a reflectance of 90% or higher.

12 . The display device of claim 1 , wherein the side surface of the bank is inclined with respect to a horizontal plane by an angle of 80 to 90 degrees.

13 . The display device of claim 12 , wherein the side surface of the bank is parallel to a side surface of the protective layer.

14 . The display device of claim 1 , wherein the light emitting diode has a diameter of 100 micrometers or less.