Display device
A display device may include a first sub-pixel including a first light emitting element disposed in a first sub-pixel area of a substrate, a second sub-pixel including a second light emitting element disposed in a second sub-pixel area located in a first direction with respect to the first sub-pixel area of the substrate, a bank layer disposed between the first and second sub-pixels, a first color filter pattern disposed on the first sub-pixel and the bank layer, and a second color filter pattern disposed on the second sub-pixel and the bank layer. The first light emitting element may emit light having a first color. The second light emitting element may emit light having a second color. The first color filter pattern and the second color filter pattern may at least partially overlap each other on the bank layer.
1. A display device comprising:
a substrate;
a first sub-pixel including a first light emitting element disposed on and directly above a main surface of the substrate and in a first sub-pixel area of the substrate;
a second sub-pixel including a second light emitting element disposed in a second sub-pixel area located in a first direction with respect to the first sub-pixel area of the substrate;
a bank layer disposed between the first sub-pixel and the second sub-pixel;
a first color filter pattern disposed on the first sub-pixel and the bank layer; and
a second color filter pattern disposed on the second sub-pixel and the bank layer, wherein
the first light emitting element emits light having a first color,
the second light emitting element emits light having a second color different from the first color,
the first color filter pattern and the second color filter pattern at least partially overlap each other on the bank layer, and
each of the first light emitting element and the second light emitting element includes a first semiconductor layer and a second semiconductor layer, both of the first and second semiconductor layers intersecting a plane parallel to a plane defined by the main surface of the substrate.
2. The display device according to claim 1 , further comprising
a third sub-pixel including a third light emitting element disposed in a third sub-pixel area adjacent to the second sub-pixel area,
the bank layer disposed between the second sub-pixel and the third sub-pixel, and
a third color filter pattern disposed on the third sub-pixel and the bank layer, wherein
the third light emitting element emits light having a third color different from the first color and the second color,
the third color filter pattern is a color filter different from the first color filter pattern and the second color filter pattern, and
the second color filter pattern and the third color filter pattern at least partially overlap each other on the bank layer.
3. The display device according to claim 2 , wherein the third color filter pattern is further disposed on the bank layer disposed between the first sub-pixel and the second sub-pixel.
4. The display device according to claim 3 , wherein the first color filter pattern is further disposed on the bank layer disposed between the second sub-pixel and the third sub-pixel.
5. The display device according to claim 4 , wherein the second color filter pattern is further disposed on the bank layer disposed between the third sub-pixel and the first sub-pixel.
6. The display device according to claim 2 , wherein
in a plan view, a fourth sub-pixel area is located in a second direction perpendicular to the first direction with respect to the first sub-pixel area,
the display device further comprises:
a fourth sub-pixel including a fourth light emitting element disposed in the fourth sub-pixel area;
the bank layer disposed between the first sub-pixel and the fourth sub-pixel; and
a fourth color filter pattern disposed on the fourth sub-pixel and the bank layer,
the fourth light emitting element emits light having one of the first color, the second color, and the third color, and
the fourth color filter pattern is a color filter substantially identical to one of the first color filter pattern, the second color filter pattern, and the third color filter pattern.
7. The display device according to claim 6 , wherein
the fourth light emitting element emits light having a color substantially identical to the first color of the first light emitting element,
the fourth color filter pattern is a color filter substantially identical to the first color filter pattern, and
the first color filter pattern and the fourth color filter pattern are provided as a single color filter and successively disposed in the first sub-pixel area and the fourth sub-pixel area.
8. The display device according to claim 7 , wherein at least one of the second color filter pattern and the third color filter pattern is further disposed on the bank layer disposed between the first sub-pixel and the fourth sub-pixel.
9. The display device according to claim 6 , wherein
the fourth light emitting element emits light having a color substantially identical to one of the second color of the second light emitting element and the third color of the third light emitting element, and
the fourth color filter pattern is a color filter substantially identical to one of the second color filter pattern and the third color filter pattern.
10. The display device according to claim 9 , wherein the first color filter pattern, the second color filter pattern, and the third color filter pattern are disposed on the bank layer disposed between the first sub-pixel and the fourth sub-pixel.
11. The display device according to claim 2 , wherein the first color filter pattern, the second color filter pattern, and the third color filter pattern further include scattering particles dispersed therein.
12. The display device according to claim 11 , wherein the scattering particles include at least one of titanium oxide (TiO 2 ), zirconium oxide (ZrO 2 ), aluminium oxide (Al 2 O 3 ), indium oxide (In 2 O 3 ), zinc oxide (ZnO), tin oxide (SnO 2 ), and silica.
13. The display device according to claim 2 , wherein
the first color is red,
the second color is green, and
the third color is blue.
14. The display device according to claim 1 , wherein a height of each of the first color filter pattern and the second color filter pattern is greater than a height of the bank layer.
15. The display device according to claim 1 , further comprising a capping layer disposed to overlap the first color filter pattern and the second color filter pattern.
16. The display device according to claim 1 , wherein
each of the first light emitting element and the second light emitting element is a light emitting diode having a size of a micrometer scale or a nanometer scale, and
each of the first light emitting element and the second 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.
17. The display device according to claim 16 , wherein
the first semiconductor layer is disposed on a first end of each of the first light emitting element and the second light emitting element,
the second semiconductor layer is disposed on a second end of each of the first light emitting element and the second light emitting element, and
the first semiconductor layer comprises an n-type semiconductor layer,
the second semiconductor layer comprises a p-type semiconductor layer, and
a length of the first semiconductor layer is greater than a length of the second semiconductor layer.
18. The display device according to claim 17 , further comprising:
a first electrode and a second electrode disposed on the substrate and spaced apart from each other in the first direction, wherein
the first electrode is electrically connected to the first end, and
the second electrode is electrically connected to the second end.
19. The display device according to claim 18 , wherein
a first bank formed adjacent to the first end of the first light emitting element and a second bank formed adjacent to the second end of the first light emitting element are included in the first sub-pixel area, and
the first bank is disposed between the substrate and the first electrode, and
the second bank is disposed between the substrate and the second electrode.
20. The display device according to claim 19 , further comprising:
a passivation layer disposed on the substrate and overlapping the first light emitting element, the first electrode, and the second electrode,
wherein the bank layer is disposed on the passivation layer.
21. The display device according to claim 1 , wherein
each of the light emitting elements is rod shaped having a length and width with the length being greater than the width,
the first semiconductor layer and the second semiconductor layer of each light emitting element are spaced apart from one another along a direction of the length,
the first and second semiconductor layers of each light emitting element intersect a respective line parallel to the main surface of the substrate, and
the line intersects the bank, the first semiconductor layer, and the second semiconductor layer.