OLED including organic layers including overlapping edges
According to one embodiment, a display device includes a first electrode, an organic layer disposed on the first electrode, and a second electrode covering the organic layer. The organic layer includes a first layer having a first edge portion and a second layer between the first layer and the second electrode. The second layer covers the first edge portion.
1 . A display device comprising:
a first electrode;
an organic layer disposed on the first electrode; and
a second electrode covering the organic layer, wherein
the organic layer includes:
a first injection layer which generates a first carrier;
a first transport layer which transports the first carrier,
a first blocking layer which blocks a second carrier;
an emitting layer which emits light;
a second blocking layer which blocks the first carrier;
a second transport layer which transports the second carrier; and
a second injection layer which generates the second carrier;
the first injection layer, the first transport layer, the first blocking layer, the emitting layer, the second blocking layer, the second transport layer, and the second injection layer are stacked in this order from the first electrode toward the second electrode,
the first blocking layer covers edge portions of the first injection layer and the first transport layer, and
an edge portion of the second blocking layer is in contact with the first blocking layer.
2 . The display device of claim 1 , wherein
the edge portions of the first injection layer and the first transport layer are not in contact with the second electrode, and
the edge portion of the first blocking layer is in contact with the second electrode.
3 . The display device of claim 1 , wherein
the second blocking layer covers an edge portion of the emitting layer.
4 . The display device of claim 3 , wherein
the edge portion of the second blocking layer is in contact with the second electrode.
5 . The display device of claim 1 , wherein
the edge portion of the first blocking layer includes a first side and a second side, and
the second blocking layer covers the second side and does not cover the first side.
6 . The display device of claim 1 , wherein
the first injection layer includes:
a first region in which a dopant is distributed at a first concentration; and
a second region located between the first region and the edge portion of the first blocking layer and in which the dopant is distributed at a second concentration lower than the first concentration.
7 . The display device of claim 1 , wherein
an area of the first blocking layer is larger than an area of the first injection layer in planar view.
8 . The display device of claim 1 , further comprising
a rib having an opening overlapping with the first electrode, wherein
the organic layer is in contact with the first electrode through the opening, and
the edge portion of the first injection layer is located on the rib.
9 . The display device of claim 8 , wherein
the rib covers a peripheral portion of the first electrode.
10 . The display device of claim 1 , further comprising:
a sub-pixel disposed in a display region for displaying an image; and
a dummy sub-pixel disposed in a peripheral region outside the display region, wherein
the organic layer is continuously disposed over the sub-pixel and the dummy sub-pixel.
11 . The display device of claim 1 , wherein
the first transport layer is thicker than the first injection layer.