DISPLAY DEVICE AND MANUFACTURING METHOD OF DISPLAY DEVICE
According to one embodiment, a display device includes a substrate, a lower electrode, a rib, a partition having lower and upper portions, an organic layer, and an upper electrode. The partition has first and second partitions. The upper portion of the first partition has a first end portion. The upper portion of the second partition has a second end portion. A thickness of the organic layer immediately under the first end portion is less than that of the organic layer immediately under the second end portion. A thickness of the upper electrode immediately under the first end portion is greater than that of the upper electrode immediately under the second end portion.
1 . A display device comprising:
a substrate;
a lower electrode provided above the substrate;
a rib having a pixel aperture which overlaps the lower electrode;
a partition which has a conductive lower portion provided on the rib and an upper portion protruding from a side surface of the lower portion;
an organic layer which is in contact with the lower electrode through the pixel aperture and emits light based on application of voltage; and
an upper electrode which covers the organic layer and is in contact with the lower portion of the partition, wherein
the partition has first and second partitions which are provided such that the pixel aperture is interposed between the first and second partitions,
the upper portion of the first partition has a first end portion which overlaps the organic layer and the upper electrode,
the upper portion of the second partition has a second end portion which overlaps the organic layer and the upper electrode,
a thickness of the organic layer immediately under the first end portion is less than a thickness of the organic layer immediately under the second end portion, and
a thickness of the upper electrode immediately under the first end portion is greater than a thickness of the upper electrode immediately under the second end portion.
2 . The display device of claim 1 , wherein
a contact area of the lower portion of the first partition and the organic layer is less than a contact area of the lower portion of the second partition and the organic layer.
3 . The display device of claim 2 , wherein
a contact area of the lower portion of the first partition and the upper electrode is greater than a contact area of the lower portion of the second partition and the upper electrode.
4 . The display device of claim 1 , wherein
the organic layer has a first layer and a second layer located on the first layer,
the first layer is spaced apart from the lower portions of the first and second partitions, and
the second layer is in contact with at least the lower portion of the second partition.
5 . The display device of claim 4 , wherein
the first layer includes a hole injection layer, and
the second layer includes a light emitting layer.
6 . The display device of claim 1 , further comprising a cap layer which covers the upper electrode.
7 . The display device of claim 6 , further comprising a sealing layer which continuously covers the cap layer, the first partition and the second partition.
8 . The display device of claim 1 , wherein
the lower portion includes:
a conductive bottom layer provided on the rib; and
a stem layer provided on the bottom layer, and
the upper electrode is in contact with at least the bottom layer of the lower portion of the first partition.
9 . The display device of claim 8 , wherein
an end portion of the bottom layer protrudes from a side surface of the stem layer.
10 . A manufacturing method of a display device, including:
preparing a substrate including:
a lower electrode;
a rib having a pixel aperture which overlaps the lower electrode; and
a partition which has a conductive lower portion provided on the rib and an upper portion protruding from a side surface of the lower portion;
forming an organic layer which is in contact with the lower electrode through the pixel aperture and emits light based on application of voltage by vapor deposition; and
forming an upper electrode which covers the organic layer and is in contact with the lower portion of the partition by vapor deposition, wherein
the organic layer includes a first thin film,
a first evaporation direction, in which a first evaporation source used to form the first thin film emits a vaporized material, inclines with respect to a normal direction of the substrate, and
a second evaporation direction, in which a second evaporation source used to form the upper electrode emits a vaporized material, inclines to an opposite direction of the first evaporation direction with respect to the normal direction.
11 . The manufacturing method of claim 10 , wherein
the organic layer includes a second thin film, and
a third evaporation direction, in which a third evaporation source used to form the second thin film emits a vaporized material, is parallel to the normal direction.
12 . The manufacturing method of claim 11 , wherein
the first thin film is one of a hole transport layer, an electron blocking layer, a light emitting layer, a hole blocking layer, an electron transport layer and an electron injection layer, and
the second thin film is a hole injection layer.
13 . The manufacturing method of claim 10 , wherein
the organic layer consists of a plurality of thin films including the first thin film, and
in each of a plurality of evaporation sources used to form the thin films, an evaporation direction for emitting a vaporized material inclines to an opposite direction of the second evaporation direction with respect to the normal direction.
14 . The manufacturing method of claim 10 , wherein
the upper electrode includes a first conductive material and a second conductive material,
the vapor deposition of the upper electrode is co-evaporation at a co-evaporation ratio at which a ratio of the second conductive material is higher than a ratio of the first conductive material,
in the co-evaporation, the vaporized first conductive material is emitted from the second evaporation source in the second evaporation direction, and the vaporized second conducive material is emitted from a fourth evaporation source in a fourth evaporation direction,
the fourth evaporation direction inclines to a same direction as the second evaporation direction with respect to the normal direction, and
an angle formed by the fourth evaporation direction with the normal direction is greater than an angle formed by the second evaporation direction with the normal direction.
15 . A manufacturing method of a display device, including:
preparing a substrate including:
a lower electrode;
a rib having a pixel aperture which overlaps the lower electrode; and
a partition which has a conductive lower portion provided on the rib and an upper portion protruding from a side surface of the lower portion;
forming an organic layer which is in contact with the lower electrode through the pixel aperture and emits light based on application of voltage by vapor deposition; and
forming an upper electrode which covers the organic layer and is in contact with the lower portion of the partition by vapor deposition, wherein
the organic layer includes a first thin film,
a first evaporation source used to form the first thin film comprises a first nozzle which emits a vaporized material in a first evaporation direction, and a first shield which protrudes from the first nozzle,
a second evaporation source used to form the upper electrode comprises a second nozzle which emits a vaporized material in a second evaporation direction,
the second evaporation direction inclines to a first lateral direction with respect to a normal direction of the substrate, and
the first shield has a shape in which a height on a first lateral direction side of the first nozzle is greater than a height on a second lateral direction side opposite to the first lateral direction side.
16 . The manufacturing method of claim 15 , wherein
the organic layer includes a second thin film,
a third evaporation source used to form the second thin film comprises a third nozzle which emits a vaporized material in a third evaporation direction, and a second shield which protrudes from the third nozzle, and
the second shield has a shape in which a height on a first lateral direction side of the third nozzle is equal to a height on a second lateral direction side of the third nozzle.
17 . The manufacturing method of claim 16 , wherein
the second shield surrounds the third nozzle and has a uniform height over a whole circumference of the third nozzle.
18 . The manufacturing method of claim 16 , wherein
the first thin film is one of a hole transport layer, an electron blocking layer, a light emitting layer, a hole blocking layer, an electron transport layer and an electron injection layer, and
the second thin film is a hole injection layer.
19 . The manufacturing method of claim 15 , wherein
the organic layer consists of a plurality of thin films including the first thin film, and
each of a plurality of evaporation sources used to form the thin films comprises a nozzle which emits a vaporized material, and a shield having a shape in which a height on a first lateral direction side of the nozzle is greater than a height on a second lateral direction side.
20 . The manufacturing method of claim 15 , wherein
the upper electrode includes a first conductive material and a second conductive material,
the vapor deposition of the upper electrode is co-evaporation at a co-evaporation ratio at which a ratio of the second conductive material is higher than a ratio of the first conductive material,
in the co-evaporation, the vaporized first conductive material is emitted from the second evaporation source in the second evaporation direction, and the vaporized second conductive material is emitted from a fourth evaporation source in a fourth evaporation direction,
the fourth evaporation direction inclines to a same direction as the second evaporation direction with respect to the normal direction, and
an angle formed by the fourth evaporation direction with the normal direction is greater than an angle formed by the second evaporation direction with the normal direction.