Light-emitting device, display device having same, and method for manufacturing same
A light emitting device may include: a substrate including a plurality of unit light emitting regions; and first to fourth insulating layers sequentially on the substrate. Each of the unit light emitting regions may include: at least one light emitting element on the first insulating layer, the at least one light emitting element having a first end portion and a second end portion in a length direction thereof; first and second partition walls on the substrate, and the first and second partition walls being spaced apart from each other; a first reflective electrode on the first partition wall and a second reflective electrode on the second partition wall; a first contact electrode on the first reflective electrode, the first contact electrode connecting the first reflective electrode and the first end portion of the light emitting element; a second contact electrode on the second reflective electrode, the second contact electrode connecting the second reflective electrode and the second end portion of the light emitting element; and a conductive pattern provided between the first insulating layer and the first contact electrode, the conductive pattern surrounding the first and second reflective electrodes when viewed on a plane.
1. A light emitting device comprising:
a substrate comprising a plurality of unit light emitting regions; and
a pixel disposed in each of the plurality of unit light emitting regions,
wherein the pixel comprises:
a first wall and a second wall disposed on the substrate, the first wall and the second wall being spaced apart from each other;
a first electrode disposed on the first wall, and a second electrode disposed on the second wall and being spaced apart from the first electrode;
a first insulating layer disposed on the first electrode and the second electrode;
a light emitting element disposed on the first insulating layer, the light emitting element comprising a first end portion and a second end portion;
a first contact electrode disposed on the first end portion of the light emitting element and the first electrode, the first contact electrode connecting the first electrode and the first end portion of the light emitting element;
a second contact electrode disposed on the second end portion of the light emitting element and the second electrode, the second contact electrode connecting the second electrode and the second end portion of the light element; and
an overcoat layer disposed on the second contact electrode.
2. The light emitting device of claim 1 , wherein the pixel further comprises:
a second insulating layer disposed on the light emitting element and exposing the first end portion and the second end portion of the light emitting element;
a third insulating layer disposed on the first contact electrode to cover the first contact electrode; and
a fourth insulating layer disposed on the third insulating layer and the second contact electrode, respectively.
3. The light emitting device of claim 2 , wherein:
the first insulating layer is disposed between the substrate and the light emitting element, and between the first electrode and the first contact electrode, respectively; and
the overcoat layer is disposed on the fourth insulating layer and covering the fourth insulating layer.
4. The light emitting device of claim 3 , wherein the pixel further comprises:
a first capping layer disposed on the first electrode and in direct contact with the first electrode; and
a second capping layer disposed on the second electrode and in direct contact with the second electrode.
5. The light emitting device of claim 4 , wherein the first capping layer, the second capping layer, the first contact electrode, and the second contact electrode include a transparent conductive material.
6. The light emitting device of claim 3 , wherein:
the first contact electrode is disposed over the first insulating layer on the first electrode, the first end portion of the light emitting element, and one side of the second insulating layer, and
the second contact electrode is disposed over the second electrode, the second end portion of the light emitting element, and an other side of the second insulating layer.
7. The light emitting device of claim 6 , wherein the first electrode and the second electrode are provided on a same layer and include a same material.
8. The light emitting device of claim 6 , wherein the pixel further comprises:
a first connection line extending in a first direction and connected to the first electrode; and
a second connection line extending in the first direction and connected to the second electrode, the second connection line spaced apart from the first connection line.
9. The light emitting device of claim 8 , wherein:
the first electrode includes a (1-1)th electrode and a (1-2)th electrode branching off from the first connection line to a corresponding unit light emitting region in a second direction intersecting the first direction; and
the (1-1)th electrode and the (1-2)th electrode are spaced apart from each other with the second electrode interposed therebetween.
10. The light emitting device of claim 1 , wherein the first end portion and the second end portion face each other in a longitudinal direction of the light emitting element, and
wherein the light emitting element comprises:
a first semiconductor layer doped with a first conductive dopant;
a second semiconductor layer doped with a second conductive dopant; and
an active layer disposed between the first semiconductor layer and the second semiconductor layer.
11. A display device comprising:
a substrate comprising a display area including a plurality of unit light emitting regions and a non-display area surrounding at least one side of the display area; and
a pixel disposed in each of the plurality of unit light emitting regions,
wherein the pixel comprises:
a pixel circuit layer disposed on the substrate and including at least one transistor; and
a display element layer disposed on the pixel circuit layer and including at least one light emitting element, and
wherein the display element layer comprises:
a first wall and a second wall disposed on the pixel circuit layer, the first wall and the second wall being spaced apart from each other;
a first electrode disposed on the first wall, and a second electrode disposed on the second wall and being spaced apart from the first electrode;
a first insulating layer disposed on the first electrode and the second electrode;
the at least one light emitting element disposed on the first insulating layer, the at least one light emitting element comprising a first end portion and a second end portion;
a first contact electrode disposed on the first end portion of the at least one light emitting element and the first electrode, the first contact electrode connecting the first electrode and the first end portion of the at least one light emitting element;
a second contact electrode disposed on the second end portion of the at least one light emitting element and the second electrode, the second contact electrode connecting the second electrode and the second end portion of the at least one light element; and
an overcoat layer disposed on the second contact electrode.
12. The display device of claim 11 , wherein the pixel circuit layer comprises:
a buffer layer disposed on the substrate;
a gate insulating layer disposed on the buffer layer;
an interlayer insulating layer disposed on the gate insulating layer;
a passivation layer disposed on the interlayer insulating layer;
a driving voltage line disposed on the gate insulating layer; and
a bridge pattern disposed on the interlayer insulating layer and electrically connected to the driving voltage line, and
wherein the bridge pattern electrically connects the driving voltage line and the second electrode.
13. The display device of claim 12 , wherein the at least one transistor comprises:
a semiconductor layer disposed on the buffer layer;
a gate electrode disposed on the gate insulating layer;
a source electrode disposed on the interlayer insulating layer and connected to one end of the semiconductor layer; and
a drain electrode disposed on the interlayer insulating layer and connected to the other end of the semiconductor layer, and
wherein one of the source electrode and the drain electrode is electrically connected to the first electrode.
14. The display device of claim 13 , wherein the source electrode, the drain electrode, and the bridge pattern are provided on a same layer.
15. The display device of claim 13 , wherein the display element layer further comprises:
a second insulating layer disposed on the at least one light emitting element and exposing the first end portion and the second end portion of the at least one light emitting element;
a third insulating layer disposed on the first contact electrode to cover the first contact electrode; and
a fourth insulating layer disposed on the third insulating layer and the second contact electrode, respectively.
16. The display device of claim 15 , wherein the display element layer further comprises:
a first connection line extending in a first direction and connected to the first electrode;
a second connection line extending in the first direction and connected to the second electrode, the second connection line spaced apart from the first connection line;
a first capping layer disposed on the first electrode and in direct contact with the first electrode; and
a second capping layer disposed on the second electrode and in direct contact with the second electrode.
17. The display device of claim 16 , wherein:
the first electrode includes a (1-1)th electrode and a (1-2)th electrode branching off from the first connection line to a corresponding unit light emitting region in a second direction intersecting the first direction; and
the (1-1)th electrode and the (1-2)th electrode are spaced apart from each other with the second electrode interposed therebetween.
18. The display device of claim 11 , wherein:
the first end portion and the second end portion face each other in a longitudinal direction of the at least one light emitting element; and
the at least one light emitting element comprises:
a first semiconductor layer doped with a first conductive dopant;
a second semiconductor layer doped with a second conductive dopant; and
an active layer disposed between the first semiconductor layer and the second semiconductor layer.