Display device with electrode-barrier structure and method of manufacturing the same

1 . A display device comprising:

a light emitting element on a base layer and including a first electrode, a second electrode, and a light emitting part electrically connected between the first electrode and the second electrode;

a pixel defining layer on the base layer;

a barrier layer on the pixel defining layer; and

a third electrode on the barrier layer,

wherein the first electrode includes a (1_1)-th electrode and a (1_2)-th electrode,

the pixel defining layer is between the (1_1)-th electrode and the (1_2)-th electrode,

the light emitting part includes a first light emitting part electrically connected to the (1_1)-th electrode and a second light emitting part electrically connected to the (1_2)-th electrode, and

the third electrode and the barrier layer are between the first light emitting part and the second light emitting part in a plan view.

2 . The display device according to claim 1 , wherein the third electrode, the barrier layer, and the pixel defining layer overlap each other in the plan view.

3 . The display device according to claim 2 , wherein a lower surface of the barrier layer contacts the pixel defining layer, and

an upper surface of the barrier layer contacts the third electrode.

4 . The display device according to claim 1 , wherein the third electrode has a first thermal conductivity, and

the barrier layer has a second thermal conductivity less than the first thermal conductivity.

5 . The display device according to claim 4 , wherein the first thermal conductivity to the second thermal conductivity has a ratio in a range of 3.4 to 3600.

6 . The display device according to claim 4 , wherein the third electrode includes at least one of molybdenum (Mo), copper (Cu), aluminum (Al), tungsten (W), gold (Au), or silver (Ag), and

the barrier layer includes at least one of titanium (Ti), lead (Pb), aluminum oxide (SiOx), polyimide, silicon oxide (SiOx), or silicon nitride (SiNx).

7 . The display device according to claim 1 , wherein the third electrode and the barrier layer are between the (1_1)-th electrode and the (1_2)-th electrode in the plan view.

8 . The display device according to claim 1 , wherein the third electrode and the barrier layer are spaced apart from the first light emitting part and the second light emitting part in a direction in which the first light emitting part and the second light emitting part are spaced apart from each other.

9 . The display device according to claim 8 , wherein a gap is formed between the barrier layer and the light emitting part, and

in the gap, the second electrode and the pixel defining layer contact each other.

10 . The display device according to claim 1 , wherein side surfaces of each of the third electrode and the barrier layer form non-uniform side surfaces with each other.

11 . The display device according to claim 1 , further comprising:

a display area and a non-display area surrounding at least a portion of the display area; and

a pulse input line electrically connected to the third electrode,

wherein the pulse input line is in the non-display area.

12 . The display device according to claim 1 , wherein a side surface of each of the third electrode and the barrier layer forms an intervening angle with an upper surface of the pixel defining layer, and

the intervening angle is in a range of 15 degrees to 60 degrees.

13 . The display device according to claim 1 , wherein the barrier layer includes a barrier protrusion that does not overlap the third electrode in the plan view.

14 . The display device according to claim 1 , wherein the barrier layer includes a groove in which at least a portion of the third electrode is located, and

the barrier layer covers at least a portion of a side surface of the third electrode.

15 . The display device according to claim 1 , wherein the third electrode includes an electrode protrusion that does not overlap the barrier layer in the plan view.

16 . The display device according to claim 1 , wherein the second electrode is on a side surface of the third electrode, the first light emitting part, and the second light emitting part.

17 . A display device comprising:

a first sub-pixel forming a first sub-pixel area and a second sub-pixel forming a second sub-pixel area; and

an electrode-barrier structure between the first sub-pixel area and the second sub-pixel area,

wherein the electrode-barrier structure includes a barrier layer having a first thermal conductivity, and an electrode contacting an upper surface of the barrier layer and having a second thermal conductivity greater than the first thermal conductivity.

18 . A method of manufacturing a display device, the method comprising:

patterning a first electrode including a (1_1)-th electrode and a (1_2)-th electrode on a base layer;

patterning a pixel defining layer between the (1_1)-th electrode and the (1_2)-th electrode;

forming an electrode-barrier structure including a barrier layer and a third electrode on the pixel defining layer;

forming a base light emitting part to cover the electrode-barrier structure and the first electrode; and

removing at least a portion of the base light emitting part by providing a pulse input to the electrode-barrier structure,

wherein the third electrode has a thermal conductivity greater than a thermal conductivity of the barrier layer.

19 . The method according to claim 18 , wherein removing the portion of the base light emitting part comprises:

dissipating joule heating from the third electrode; and

providing a first light emitting part and a second light emitting part spaced apart from each other.

20 . The method according to claim 18 , wherein removing the portion of the base light emitting part comprises exposing a portion of the pixel defining layer, and

the method further comprises forming a second electrode; and

forming the second electrode comprises contacting the pixel defining layer and the second electrode.