Display device and method for manufacturing display device
To provide a display device including a plurality of pixels; a light emitting element layer formed across the plurality of pixels; and a bank formed so as to separately define adjacent pixels among the plurality of pixels, wherein the light emitting element layer includes a p-doped hole transport layer containing p-dopant, and the p-doped hole transport layer is formed on each of the pixels such that the p-doped hole transport layers on the respective adjacent pixels are separated from each other on the bank.
1. A display device, comprising:
a plurality of pixels;
a light emitting element layer formed across the plurality of pixels; and
an insulating layer formed so as to separately define adjacent pixels among the plurality of pixels,
wherein
the light emitting element layer includes a p-doped hole transport layer containing p-dopant, and
the p-doped hole transport layer is formed on each of the pixels such that the p-doped hole transport layers on respective adjacent pixels are separated from each other on the insulating layer; and
a hole transport layer formed on the p-doped hole transport layer so as to lie across the plurality of pixels.
2. The display device according to claim 1 , wherein
the light emitting element layer includes
a light emissive layer,
a lower electrode disposed under the light emissive layer, and
an upper electrode disposed on the light emissive layer, and
the insulating layer is formed such that a part of the lower electrode is exposed, and
the p-doped hole transport layer is formed on the part of the lower electrode, the part being exposed in the insulating layer.
3. The display device according to claim 1 , wherein the adjacent pixels are pixels for different colors.
4. A method for manufacturing a display device, comprising:
a step of forming an insulating layer so as to separately define adjacent pixels among a plurality of pixels;
a step of forming a hole transport layer across the plurality of pixels;
a step of injecting p-dopant into the hole transport layer so as to form a p-doped hole transport layer on each of the pixel such that the p-doped hole transport layers on respective adjacent pixels are separated from each other on the insulating layer; and
a step of forming a hole transport layer so as to lie across the plurality of pixels on the p-doped hole transport layer.
5. The method for manufacturing a display device according to claim 4 , further comprising a step of forming a lower electrode, the step being executed before the step of forming the insulating layer, wherein
at the step of forming the insulating layer, the insulating layer is formed such that a part of the lower electrode is exposed, and
at the step of forming the p-doped hole transport layer, the p-doped hole transport layer is formed on the part of the lower electrode, the part being exposed in the insulating layer.
6. The method for manufacturing a display device according to claim 4 , wherein at the step of forming the p-doped hole transport layer, the p-dopant is injected into the hole transport layer with a mask placed on the insulating layer.
7. The method for manufacturing a display device according to claim 4 , wherein at the step of forming the p-doped hole transport layer, the p-dopant is injected such that the p-doped transport layer is formed so as to lie across the plurality of pixels, and the p-dopant in the hole transport layer on the insulating layer is thereafter removed.