Display device having multilayer film exposing power line and method of manufacturing the same
Provided is a display device including a substrate including a display area and a contact area located in a display area, a power line disposed in a display area on a substrate and overlapping a contact area, a passivation layer disposed on a substrate and a power line, and an opening exposing at least a portion of an upper surface of a power line in a contact area defined in a passivation layer, a via insulation layer disposed on a passivation layer, including a via contact hole connected to an opening in a contact area, and including a protrusion protruding toward a center of a via contact hole, and a common electrode disposed on a via insulation layer and a power line and electrically connected to a power line in a contact area.
1 . A display device comprising:
a substrate including a display area and a contact area located in the display area;
a power line disposed in the display area on the substrate and overlapping the contact area;
a passivation layer disposed on the substrate and the power line, and an opening exposing at least a portion of an upper surface of the power line in the contact area defined in the passivation layer;
a via insulation layer disposed on the passivation layer, including a via contact hole connected to the opening in the contact area, and including a protrusion protruding toward a center of the via contact hole, and
a common electrode disposed on the via insulation layer and the power line and directly electrically connected to the power line in the contact area.
2 . The display device of claim 1 , wherein a multilayer film including the passivation layer and the via insulation layer has an undercut shape in the contact area by a first side surface of the opening and the protrusion.
3 . The display device of claim 2 , wherein a portion of the via insulation layer extends to an inside of the opening to cover the second side surface of the opening opposite to the first side surface.
4 . The display device of claim 3 , wherein a first inclination angle of the first side surface with respect to the upper surface of the power line is smaller than a second inclination angle of the second side surface with respect to the upper surface of the power line, and
wherein a third inclination angle of a side surface of the via insulation layer with respect to the upper surface of the power line is smaller than the second inclination angle.
5 . The display device of claim 1 , wherein the passivation layer includes an inorganic insulation material, and the via insulation layer includes an organic insulation material.
6 . The display device of claim 1 , wherein a length of the protrusion toward the center of the via contact hole is about 0.1 micrometers to about 5.0 micrometers.
7 . The display device of claim 1 , wherein the power line includes a first conductive layer and a second conductive layer disposed on the first conductive layer,
wherein the first conductive layer includes at least one selected from copper (Cu) and aluminum (Al), and
wherein the second conductive layer includes at least one selected from transparent conductive oxide, titanium (Ti), and molybdenum (Mo).
8 . The display device of claim 1 , wherein the common electrode is discontinued in the contact area by the protrusion.
9 . The display device of claim 1 , wherein the common electrode is connected entirely in the contact area.
10 . The display device of claim 1 , further comprising an emission layer discontinued in the contact area by the protrusion in the contact area.
11 . The display device of claim 10 , wherein a thickness of the emission layer is smaller than or equal to a thickness of the passivation layer.
12 . The display device of claim 10 , wherein the common electrode covers a side surface of the emission layer.
13 . The display device of claim 1 , further comprising:
a transistor disposed in the display area on the substrate;
a pixel electrode disposed on the transistor and electrically connected to the transistor; and
a capping electrode discontinued in the contact area by the protrusion and disposed on a same layer as the pixel electrode,
wherein an upper surface of the via insulation layer includes a first portion overlapping the pixel electrode and a second portion spaced apart from the pixel electrode, and
wherein a height of the first portion from an upper surface of the substrate is greater than a height of the second portion from the upper surface of the substrate.
14 . The display device of claim 1 , further comprising a pad electrode disposed in a pad area located on one side of the display area on the substrate and disposed on a same layer as the power line,
wherein the passivation layer exposes at least a portion of an upper surface of the pad electrode.
15 . The display device of claim 1 , further comprising an encapsulation layer disposed on the common electrode and including an inorganic encapsulation layer and an organic encapsulation layer,
wherein the organic encapsulation layer is disposed to fill an empty space between the power line and the protrusion.
16 . A display device comprising:
a substrate including a display area and a contact area located in the display area;
a power line disposed in the display area on the substrate and overlapping the contact area; and
a multilayer film disposed on the substrate and the power line and exposing at least a portion of an upper surface of the power line in the contact area,
wherein the multilayer film includes:
a passivation layer, and an opening exposing at least a portion of the upper surface of the power line in the contact area defined in the passivation layer; and
a via insulation layer disposed on the passivation layer, including a via contact hole connected to the opening in the contact area, and including a protrusion protruding toward a center of the via contact hole, and
wherein the multilayer film includes an undercut shape in the contact area by a first side surface of the opening and the protrusion, wherein a length of the protrusion toward the center of the via contact hole is about 0.1 micrometers to about 5.0 micrometers.
17 . The display device of claim 16 , wherein a portion of the via insulation layer extends to an inside of the opening to cover the second side surface of the opening opposite to the first side surface.
18 . The display device of claim 17 , wherein a first inclination angle of the first side surface with respect to the upper surface of the power line is smaller than a second inclination angle of the second side surface with respect to the upper surface of the power line.
19 . The display device of claim 18 , wherein a third inclination angle of a side surface of the via insulation layer with respect to the upper surface of the power line is smaller than the second inclination angle.
20 . An electronic device comprising:
a display device configured to display an image based on an input image data and a control signal; and
a host processor configured to provide the input image data and the control signal to the display device,
wherein the display device including:
a substrate including a display area and a contact area located in the display area;
a power line disposed in the display area on the substrate and overlapping the contact area;
a passivation layer disposed on the substrate and the power line, and an opening exposing at least a portion of an upper surface of the power line in the contact area defined in the passivation layer;
a via insulation layer disposed on the passivation layer, including a via contact hole connected to the opening in the contact area, and including a protrusion protruding toward a center of the via contact hole, and
a common electrode disposed on the via insulation layer and the power line and directly electrically connected to the power line in the contact area.