Display device

1. A display device comprising:

a substrate;

a plurality of pixels arranged over the substrate, each of the plurality of pixels comprising a pixel electrode;

a bank covering an end portion of the pixel electrode, exposing a part of the pixel electrode, and separating the plurality of pixels, wherein the exposed part of the pixel electrode defines a light emitting region of one of the plurality of pixels;

an organic layer disposed over the pixel electrode and the bank, the organic layer covering the plurality of pixels;

a plurality of light-emitting layers disposed over the pixel electrode with the organic layer disposed therebetween; and

a common electrode disposed over the organic layer and the light-emitting layer, wherein the plurality of light-emitting layers includes a first light-emitting layer group emitting a first color and a second light-emitting layer group emitting a second color different from the first color,

two adjacent light emitting layers in a first direction emit light of different colors,

two adjacent light emitting layers in a second direction perpendicular to the first direction emit light of the same color,

the bank comprises a first inclined surface facing one light emitting region in the first direction and a second inclined surface facing the one light emitting region in the second direction, and

a first angle between the first inclined surface and the upper surface of the pixel electrode is larger than a second angle between the second inclined surface and the upper surface of the pixel electrode.

2. The display device according to claim 1 , wherein

the first color is blue,

the second color is green, and

a number of the first light-emitting layer group is larger than a number of the second light emitting layer group.

3. The display device according to claim 1 , wherein

the first angle is equal to or larger than 85 degrees, and

a thickness of the organic layer disposed on the first inclined surface in a direction perpendicular to the first inclined surface is equal to or smaller than 1 / 10 of a thickness of the organic layer disposed on the pixel electrode in a direction perpendicular to the upper surface of the pixel electrode.

4. The display device according to claim 1 , wherein the bank comprises silicon nitride or silicon oxide.

5. The display device according to claim 1 , wherein the organic layer comprises a hole injection layer.

6. The display device according to claim 1 , wherein

the organic layer includes a hole injection layer, and

the hole injection layer comprises a low-molecular organic compound selected from the group consisting of benzidine or derivative thereof, styrylamine or a derivative thereof, triphenylmethane or a derivative thereof, porphyrin or a derivative thereof, triazole or a derivative thereof, imidazole or a derivative thereof, oxadiazole or a derivative thereof, polyarylalkane or a derivative thereof, phenylene diamine or a derivative thereof, arylamine or a derivative thereof, oxazole or a derivative thereof, anthracene or a derivative thereof, fluorenone or a derivative thereof, hydrazone or a derivative thereof, stilbene or a derivative thereof, phthalocyanine or a derivative thereof, a polysilane-based compound, a vinylcarbazole-based compound, a thiophene-based compound, and an anilin-based compound.

7. The display device according to claim 1 , further comprising a layer comprising indium tin oxide or indium zinc oxide over the common electrode.

8. The display device according to claim 1 , further comprising a metal wiring over the common electrode,

wherein the metal wiring comprises an opening pattern over in a part of a region.

9. The display device according to claim 8 , wherein the opening pattern is a stripe-shaped pattern or a lattice-shaped pattern.