Electroluminescent display device
An electroluminescent display device includes a substrate including an active area and a non-active area which encloses the active area, a planarization layer which is disposed on the substrate and extends from the active area to the non-active area, a bank over the planarization layer, an organic layer over the bank, a cathode over the organic layer, a trench pattern which is disposed in the non-active area and the cathode and the organic layer are removed and a step relieving layer which fills the trench pattern and is disposed to planarize an upper portion of the trench pattern to delay a moisture permeation speed from the side surface, thereby improving the reliability and reducing the bezel width at the same time.
1 . An electroluminescent display device, comprising:
a base substrate including an active area and a non-active area which surrounds the active area;
a planarization layer disposed on the base substrate and extending from the active area to the non-active area;
a bank disposed over the planarization layer;
an organic layer disposed over the bank;
a cathode disposed over the organic layer;
a trench pattern disposed in the non-active area where the cathode and the organic layer are removed, exposing an upper surface of the bank;
a step relieving layer filling up the trench pattern and planarizing an upper portion of the trench pattern; and
an inorganic layer disposed to cover the step relieving layer,
wherein the step relieving layer is disposed within a region covered by the inorganic layer.
2 . The electroluminescent display device according to claim 1 , wherein the step relieving layer includes a film.
3 . The electroluminescent display device according to claim 1 , wherein the step relieving layer includes a getter.
4 . The electroluminescent display device according to claim 3 , wherein the step relieving layer further includes one of an epoxy resin, an acrylic resin, and a silicon oxycarbon (SiOC) resin in which the getter is dispersed.
5 . The electroluminescent display device according to claim 1 , further comprising a capping layer disposed between the step relieving layer.
6 . The electroluminescent display device according to claim 1 , further comprising an adhesive layer and an encapsulation substrate sequentially disposed on the inorganic layer.
7 . The electroluminescent display device according to claim 6 , wherein the inorganic layer is in contact with a top surface of the step relieving layer.
8 . The electroluminescent display device according to claim 5 , wherein the inorganic layer is in contact with a side surface of the step relieving layer.
9 . The electroluminescent display device according to claim 8 , wherein the cathode covers a side surface of the organic layer and an end of the cathode is in contact with a top surface of the bank.
10 . The electroluminescent display device according to claim 9 , wherein the cathode extends from an end of the step relieving layer to an outer side surface of the base substrate.
11 . The electroluminescent display device according to claim 9 , wherein the inorganic layer is in contact with a top surface of the capping layer.
12 . The electroluminescent display device according to claim 5 , wherein the inorganic layer covers a side surface of the capping layer, a side surface of the cathode and a side surface of the organic layer, and an end of the inorganic layer is in contact with the bank.
13 . The electroluminescent display device according to claim 12 , wherein the organic layer extends to an outer side surface of the base substrate from an end of the step relieving layer.
14 . The electroluminescent display device according to claim 12 , wherein the inorganic layer is in contact with a top surface of the organic layer.
15 . The electroluminescent display device according to claim 1 , further comprising a flexible film over the base substrate at one side of the non-active area,
wherein the trench pattern is disposed in the non-active area at three sides excluding one side of the display device in which the flexible film is disposed.
16 . The electroluminescent display device according to claim 1 , wherein a part of the cathode adjacent to the trench pattern is spaced apart from the organic layer.
17 . The electroluminescent display device according to claim 16 , wherein a part of the cathode adjacent to the trench pattern is upwardly bent or rolled.
18 . The electroluminescent display device according to claim 16 , wherein the step relieving layer fills up a separated space between the cathode and the organic layer.
19 . The electroluminescent display device according to claim 1 , further comprising a sealing member having a plurality of layers and a reinforcement substrate which are disposed above the step relieving layer.
20 . The electroluminescent display device according to claim 19 , wherein the sealing member includes:
a first adhesive layer disposed on the step relieving layer;
a second adhesive layer disposed on the reinforcement substrate; and
a barrier layer disposed between the first adhesive layer and the second adhesive layer.