Display device having a light-emitting structure
A display device including two light-emitting structures on a single sub-pixel area is provided. In the display device, the two light-emitting structures are inclined toward the center of the corresponding sub-pixel area.
1. A display device comprising:
a lower substrate including a sub-pixel area for producing a specific color;
a first light-emitting structure on the sub-pixel area of the lower substrate, the first light-emitting structure including a first lower electrode inclined with respect to the lower substrate, a first light-emitting layer and a first upper electrode, which are sequentially stacked; and
a second light-emitting structure on the sub-pixel area of the lower substrate, the second light-emitting structure including a second lower electrode inclined with respect to the lower substrate, a second light-emitting layer and a second upper electrode, which are sequentially stacked,
wherein at least a portion of the second light-emitting structure is inclined in an opposite direction relative to at least a portion of the first light-emitting structure with respect to the sub-pixel area of the lower substrate.
2. The display device according to claim 1 , wherein a distance between the lower substrate and an upper surface of the first lower electrode decreases towards a center of the sub-pixel area, and a distance between the lower substrate and an upper surface of the second lower electrode decreases toward the center of the sub-pixel area.
3. The display device according to claim 1 , further comprising a thin film transistor between the lower substrate and the first light-emitting structure,
wherein the thin film transistor includes a drain electrode electrically connected to the first lower electrode and the second lower electrode.
4. The display device according to claim 3 , further comprising a lower passivation layer covering the thin-film transistor, the lower passivation layer including a first contact hole and a second contact hole which respectively expose the drain electrode, and
wherein the first lower electrode and the second lower electrode are in direct contact with the lower passivation layer.
5. The display device according to claim 3 , wherein the second light-emitting layer includes a same material as the first light-emitting layer.
6. The display device according to claim 5 , wherein the second light-emitting layer is connected to the first light-emitting layer, and wherein the second upper electrode is connected to the first upper electrode.
7. The display device according to claim 5 , further comprising a color filter on the first light-emitting structure, the color filter extending onto the second light-emitting structure.
8. The display device according to claim 1 , further comprising a first bank insulating layer covering one edge of the first lower electrode and a second bank insulating layer covering another edge of the first lower electrode.
9. A display device comprising:
a first inclined insulating layer on a lower substrate including a first inclined side which is positively tapered,
a second inclined insulating layer on the lower substrate including a second inclined side which is positively tapered, the second inclined insulating layer adjacent to the first inclined insulating layer;
a first light-emitting structure on the first inclined side, the first light-emitting structure defined by a sequential stack of a first lower electrode, a first light-emitting layer and a first upper electrode; and
a second light-emitting structure on the second inclined side, the second light-emitting structure in conjunction with the first light-emitting structure forming a well, the second light-emitting structure defined by a sequential stack of a second lower electrode spaced apart from the first light-emitting structure, a second light-emitting layer and a second upper electrode.
10. The display device according to claim 9 , wherein a width of the well decreases towards the lower substrate.
11. The display device according to claim 9 , further comprising a black matrix on an upper substrate opposite the lower substrate, the black matrix contacting with a side of a color filter above the well,
wherein a side of the black matrix is negatively tapered.
12. The display device according to claim 11 , wherein a vertical thickness of the black matrix is larger than a vertical thickness of the color filter.
13. The display device according to claim 11 , further comprising a reflective pattern on a side of the black matrix.
14. The display device according to claim 9 , wherein the color filter is in the well.
15. A display device comprising:
a lower substrate including a sub-pixel area for producing a specific color;
a thin film transistor (TFT) including a semiconductor pattern, a gate insulating layer, a gate electrode, a source electrode, and a drain electrode, the TFT disposed on an upper surface of the lower substrate within the sub-pixel area;
a first lower electrode coupled to the drain electrode of the TFT, at least a portion of an upper surface of the first lower electrode slanted in a direction with respect to the lower substrate;
a second lower electrode coupled to the drain electrode of the TFT, at least a portion of an upper surface of the second lower electrode slanted in an opposite direction than the upper surface of the first lower electrode; and
a light emitting layer on the first lower electrode and the second lower electrode for emitting light responsive to providing current from the TFT to the light emitting layer via the first lower electrode and the second lower electrode.
16. The display device according to claim 15 , wherein the upper surface of the first lower electrode and the upper surface of the second lower electrode are symmetric.
17. The display device according to claim 15 , wherein the light-emitting layer comprises a first segment on the first lower electrode and slanted in a same direction as the first lower electrode, and a second segment on the second lower electrode and slanted in a same direction as the second lower electrode,
wherein a portion of the light-emitting layer closer to a center of the sub-pixel area is closer to the upper surface of the lower substrate than a portion of the light-emitting layer closer to an edge of the sub-pixel area.
18. The display device according to claim 15 , further comprising:
an insulator between the TFT and the first lower electrode, the first lower electrode on an upper surface of the insulator, the upper surface of the insulator slanted in the same direction as the first lower electrode.
19. The display device according to claim 15 , further comprising a first bank insulating layer covering one edge of the first lower electrode and a second bank insulating layer covering another edge of the first lower electrode.
20. The display device according to claim 19 , wherein the first bank insulating layer is closer to the upper surface of the lower substrate than the second bank insulating layer.