DISPLAY DEVICE AND MANUFACTURING METHOD THEREOF
According to one embodiment, a display device includes a lower electrode, a rib including a pixel aperture, a partition on the rib, an upper electrode, and an organic layer between the lower electrode and the upper electrode. The partition includes an insulating first portion, a conductive second portion which is provided on the first portion and is in contact with the upper electrode, and a third portion provided on the second portion. A lower end of the second portion protrudes in a width direction of the partition relative to the first portion. The third portion protrudes in the width direction relative to an upper end of the second portion.
1 . A display device comprising:
a lower electrode;
a rib comprising a pixel aperture overlapping the lower electrode;
a partition provided on the rib;
an upper electrode facing the lower electrode; and
an organic layer which is located between the lower electrode and the upper electrode and emits light based on a potential difference between the lower electrode and the upper electrode, wherein
the partition comprises:
an insulating first portion;
a conductive second portion which is provided on the first portion and is in contact with the upper electrode; and
a third portion provided on the second portion,
a lower end of the second portion protrudes in a width direction of the partition relative to the first portion, and
the third portion protrudes in the width direction relative to an upper end of the second portion.
2 . The display device of claim 1 , wherein
the partition surrounds the pixel aperture.
3 . The display device of claim 1 , wherein
the organic layer consists of a plurality of layers including a hole injection layer which covers the lower electrode, and
the hole injection layer is spaced apart from the second portion.
4 . The display device of claim 3 , wherein
the first portion is thicker than the hole injection layer.
5 . The display device of claim 4 , wherein
the first portion is thinner than the second portion.
6 . The display device of claim 3 , wherein
a length in which the lower end of the second portion protrudes from the first portion is twice a thickness of the first portion or greater.
7 . The display device of claim 3 , wherein
a gap between the lower end of the second portion and the rib is blocked by the layer included in the plurality of layers and provided on the hole injection layer.
8 . The display device of claim 7 , wherein
the plurality of layers include 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 above the hole injection layer.
9 . The display device of claim 1 , wherein
the rib and the first portion are formed of different insulating inorganic materials.
10 . The display device of claim 9 , wherein
the rib is formed of silicon oxide or silicon oxynitride, and
the first portion is formed of silicon nitride.
11 . The display device of claim 9 , wherein
the second portion is formed of aluminum, and
the third portion is formed of titanium.
12 . The display device of claim 9 , wherein
the second portion is formed of aluminum, and
the third portion includes a titanium layer, and a conductive oxide layer provided on the titanium layer.
13 . The display device of claim 9 , wherein
the second portion includes a titanium layer, and an aluminum layer provided on the titanium layer, and
the third portion is formed of titanium.
14 . A manufacturing method of a display device, including:
forming a lower electrode;
forming a rib which covers at least part of the lower electrode;
forming a partition on the rib, the partition comprising an insulating first portion, a conductive second portion provided on the first portion and a third portion provided on the second portion, the second portion comprising a lower end protruding in a width direction relative to the first portion, the third portion protruding in the width direction relative to an upper end of the second portion;
forming an organic layer which covers the lower electrode through a pixel aperture provided in the rib; and
forming an upper electrode which covers the organic layer and is in contact with the second portion.
15 . The manufacturing method of claim 14 , wherein
the organic layer is formed by stacking a plurality of layers including a hole injection layer, and
the hole injection layer is spaced apart from the second portion.
16 . The manufacturing method of claim 15 , further including
blocking a gap between the lower end of the second portion and the rib by the layer included in the plurality of layers and formed after the hole injection layer.
17 . The manufacturing method of claim 14 , wherein
the forming the partition includes:
forming a first layer which is a base of the first portion;
forming a second layer which is a base of the second portion on the first layer;
forming a third layer which is a base of the third portion on the second layer;
providing a resist on the third layer; and
forming the first portion, the second portion and the third portion by etching to remove, of the first layer, the second layer and the third layer, a portion exposed from the resist and reduce widths of the first layer and the second layer.