Electroluminescent display device
An electroluminescent display device according to an embodiment of the present disclosure can include a substrate including a display area and a non-display area, a planarization layer disposed on an upper portion of the substrate, a bank disposed on the planarization layer, a stopper disposed on the bank in the non-display area, at least one trench pattern disposed outside the stopper and configured by removing a partial region of the bank such that the planarization layer is exposed, and a sealing layer disposed above the substrate. As a result, an overflow of an organic material layer is suppressed, such that a dam in the related art can be eliminated, and a bezel width can be reduced.
1 . An electroluminescent display device comprising:
a substrate including a display area and a non-display area;
a planarization layer disposed on an upper portion of the substrate;
a bank disposed on the planarization layer;
a stopper disposed on the bank in the non-display area;
at least one trench pattern disposed outside the stopper and configured by removing a partial region of the bank so that the planarization layer is exposed,
wherein the at least one trench pattern comprises a first trench pattern located outside the stopper and a second trench pattern located outside the first trench pattern,
wherein the first trench pattern and the second trench pattern each expose a top surface of the planarization layer, and
wherein the first trench pattern has a greater depth than the second trench pattern; and
a sealing layer disposed above the substrate.
2 . The electroluminescent display device of claim 1 , further comprising:
a thin-film transistor disposed on the upper portion of the substrate in the display area;
a first low-potential power line disposed on the upper portion of the substrate in the non-display area; and
a protective layer disposed on the thin-film transistor and the first low-potential power line.
3 . The electroluminescent display device of claim 2 , wherein the planarization layer comprises:
a first planarization layer disposed on the protective layer; and
a second planarization layer disposed on the first planarization layer.
4 . The electroluminescent display device of claim 3 , further comprising:
a second low-potential power line disposed on the first planarization layer in the non-display area and connected to the first low-potential power line; and
a connection electrode disposed on the second planarization layer in the non-display area and connected to the second low-potential power line.
5 . The electroluminescent display device of claim 4 , wherein the second planarization layer is disposed to extend to a part of the non-display area so that a part of the first planarization layer is exposed, and
wherein a side surface of the second planarization layer extending to a part of the non-display area is inclined.
6 . The electroluminescent display device of claim 5 , further comprising:
an anode disposed on the second planarization layer in the display area;
a light-emitting part provided on the anode and disposed to extend to a boundary between the display area and the non-display area; and
a cathode disposed to extend to a part of the non-display area, configured to cover the light-emitting part, and electrically connected to the connection electrode.
7 . The electroluminescent display device of claim 5 , wherein the bank is disposed to extend to a part of the non-display area and inclined along the inclined side surface of the second planarization layer, and
wherein the at least one trench pattern is configured by removing a part of the bank adjacent to an inclined side surface of the bank so that the second planarization layer is exposed.
8 . The electroluminescent display device of claim 7 , wherein the sealing layer comprises:
a first inorganic material layer;
an organic material layer disposed on the first inorganic material layer; and
a second inorganic material layer disposed on the organic material layer, and
wherein the first inorganic material layer extends to a part of the non-display area, and is disposed to cover a top surface and a side surface of the stopper and an inner surface of the at least one trench pattern.
9 . The electroluminescent display device of claim 8 , wherein the first inorganic material layer is disposed to cover the inclined side surface of the second planarization layer and the inclined bank, and
wherein the first inorganic material layer extending to a part of the non-display area is inclined along the inclined side surface of the second planarization layer.
10 . The electroluminescent display device of claim 8 , wherein the organic material layer is disposed to a position before the stopper.
11 . The electroluminescent display device of claim 8 , wherein the organic material layer is trapped in the at least one trench pattern even when the organic material layer flows over the stopper.
12 . The electroluminescent display device of claim 1 , wherein the at least one trench pattern is provided in the form of a quadrangular frame that surrounds the display area.
13 . The electroluminescent display device of claim 12 , wherein the stopper is provided in the form of a quadrangular frame that surrounds the display area.
14 . The electroluminescent display device of claim 1 , wherein the bank disposed between the first trench pattern and the second trench pattern has a bottom surface facing the substrate, an upper surface opposing the bottom surface, and side surfaces connecting the bottom surface and upper surface, and
wherein the upper surface of the bank disposed between the first trench pattern and the second trench pattern is inclined.
15 . The electroluminescent display device of claim 1 , wherein the first trench pattern and the second trench pattern both extend below a bottom surface of the stopper, the bottom surface of the stopper facing the substrate.