DISPLAY DEVICE AND MANUFACTURING METHOD OF THE SAME
According to one embodiment, a display device includes a base electrode, a rib including an aperture overlapping the base electrode, a lower electrode disposed at the aperture and electrically connected to the base electrode, a partition including a lower part disposed on the rib and an upper part projecting from a side surface of the lower part, a organic layer covering the lower electrode, and a upper electrode disposed on the organic layer. A periphery of the base electrode is covered by the rib. The base electrode is formed of a first metal material. A periphery of the lower electrode is located on the rib. The lower electrode is formed of a second metal material different from the first metal material.
1 . A display device comprising:
a substrate;
a first base electrode disposed above the substrate;
a rib formed of an inorganic insulating material and comprising an aperture overlapping the first base electrode;
a first lower electrode disposed at the aperture and electrically connected to the first base electrode;
a partition including a conductive lower part disposed on the rib and an upper part projecting from a side surface of the lower part;
a first organic layer configured to emit light of a first color and covering the first lower electrode; and
a first upper electrode disposed on the first organic layer and contacting the lower part, wherein
a periphery of the first base electrode is covered by the rib,
the first base electrode is formed of a first metal material,
a periphery of the first lower electrode is located on the rib,
the first lower electrode is formed of a second metal material different from the first metal material.
2 . The display device of claim 1 , further comprising:
a second base electrode disposed above the substrate, separated from the first base electrode, and formed of the first metal material;
a second lower electrode electrically connected to the second base electrode and formed of the second metal material;
a second organic layer configured to emit light of a second color different from the first color and covering the second lower electrode; and
a second upper electrode disposed on the second organic layer and contacting the lower part, wherein
a periphery of the second base electrode is covered by the rib,
a periphery of the second lower electrode is located on the rib, and
a thickness of the first lower electrode is different from a thickness of the second lower electrode.
3 . The display device of claim 2 , wherein
the second color is a color of a wavelength longer than a wavelength of the first color, and
the thickness of the second lower electrode is greater than the thickness of the first lower electrode.
4 . The display device of claim 1 , wherein
the first metal material is aluminum or an aluminum alloy, and
the second metal material is silver.
5 . The display device of claim 1 , wherein
a thickness of the first base electrode is greater than or equal to 50 nm.
6 . The display device of claim 1 , wherein
a thickness of the first lower electrode is greater than or equal to 10 nm.
7 . The display device of claim 1 , wherein
a thickness of the first lower electrode is smaller than a thickness of the first base electrode.
8 . The display device of claim 2 , wherein
the thickness of the second lower electrode is equal to a thickness of the second base electrode or smaller than the thickness of the second base electrode.
9 . The display device of claim 2 , wherein
the first lower electrode is in contact with the first base electrode, and
the second lower electrode is in contact with the second base electrode.
10 . The display device of claim 2 , further comprising:
a first middle electrode interposed between the first base electrode and the first lower electrode; and
a second middle electrode interposed between the second base electrode and the second lower electrode, wherein
respective peripheries of the first middle electrode and the second middle electrode are located on the rib, and
the first middle electrode and the second middle electrode are formed of a third metal material different from the second metal material.
11 . The display device of claim 10 , wherein
the third metal material is aluminum or an aluminum alloy.
12 . The display device of claim 1 , wherein
part of the first lower electrode is located on the upper part and is separated from a portion disposed at the aperture.
13 . The display device of claim 1 , further comprising:
a first transparent layer disposed on the first upper electrode; and
a second transparent layer disposed on the first transparent layer, wherein
a refractive index of the second transparent layer is smaller than a refractive index of the first transparent layer.
14 . The display device of claim 13 , further comprising
a sealing layer formed of an inorganic insulating material, disposed on the second transparent layer, and contacting the lower part, wherein
a refractive index of the sealing layer is greater than the refractive index of the second transparent layer.
15 . A manufacturing method of a display device, comprising:
forming a metal layer of a first metal material above a substrate;
patterning the metal layer and forming a first base electrode;
forming a rib comprising an aperture overlapping the first base electrode and a partition including a conductive lower part located on the rib and an upper part projecting from a side surface of the lower part;
depositing a second metal material different from the first metal material and forming a first lower electrode electrically connected to the first base electrode;
forming a first organic layer on the first lower electrode; and
forming a first upper electrode which located on the first organic layer and is in contact with the lower part.
16 . The manufacturing method of the display device of claim 15 , wherein
the first metal material is aluminum or an aluminum alloy, and
the second metal material is silver.
17 . The manufacturing method of the display device of claim 15 , further comprising,
before forming the first lower electrode, depositing a third metal material different from the second metal material and forming a first middle electrode on the first base electrode.
18 . The manufacturing method of the display device of claim 17 , wherein
the third metal material is aluminum or an aluminum alloy.
19 . The manufacturing method of the display device of claim 15 , further comprising:
forming a first transparent layer on the first upper electrode;
forming a second transparent layer on the first transparent layer; and
forming a sealing layer which is located on the second transparent layer and which is in contact with the lower part.
20 . The manufacturing method of the display device of claim 15 , wherein
the first lower electrode and the first organic layer are continuously formed in a vacuum environment.