Display device and method of fabricating the same
A display device may include a wiring pad and a dummy pad disposed on a substrate and spaced apart from each other, a planarization layer disposed over the wiring pad and the dummy pad, a first insulating layer disposed on the planarization layer, the first insulating layer exposing a portion of the planarization layer, a first pad electrode and a second pad electrode disposed on the planarization layer and the first insulating layer, the first pad electrode electrically connected to the wiring pad and the second pad electrode electrically connected to the dummy pad, a second insulating layer disposed on the first pad electrode and the second pad electrode, conductive particles disposed on the first pad electrode and the second pad electrode, the conductive particles having a cylindrical shape, and an external device disposed on the conductive particles.
1 . A display device comprising:
a wiring pad and a dummy pad disposed on a substrate and spaced apart from each other;
a planarization layer disposed over the wiring pad and the dummy pad;
a first insulating layer disposed on the planarization layer, the first insulating layer exposing a portion of the planarization layer;
a first pad electrode and a second pad electrode disposed on the planarization layer and the first insulating layer, the first pad electrode electrically connected to the wiring pad and the second pad electrode electrically connected to the dummy pad;
a second insulating layer disposed on the first pad electrode and the second pad electrode;
conductive particles disposed on the first pad electrode and the second pad electrode, the conductive particles having a cylindrical shape; and
an external device disposed on the conductive particles,
wherein each of the conductive particles comprises:
a conductive layer; and
a capping layer surrounding the conductive layer, and
the conductive layer has a cylindrical shape.
2 . The display device of claim 1 , wherein a side surface of the cylindrical shape of each of the conductive particles electrically contacts the first pad electrode and the second pad electrode.
3 . The display device of claim 1 , wherein
the external device comprises circuit lines disposed on a surface and the circuit lines
electrically contact the conductive particles.
4 . The display device of claim 3 , further comprising:
a non-conductive layer disposed between the external device and the substrate, wherein
the conductive particles are dispersed in the non-conductive layer.
5 . The display device of claim 1 , wherein the planarization layer comprises:
a first through hole exposing the wiring pad and a second through hole exposing the dummy pad,
the first pad electrode electrically contacts the wiring pad through the first through hole, and
the second pad electrode electrically contacts the dummy pad through the second through hole of the planarization layer.
6 . The display device of claim 5 , wherein the first insulating layer comprises a first opening exposing the first through hole and the second through hole of the planarization layer.
7 . The display device of claim 1 , wherein
the second insulating layer comprises a second opening exposing the first pad electrode and the second pad electrode, and
the conductive particles electrically contact the first pad electrode and the second pad electrode through the second opening of the second insulating layer.
8 . The display device of claim 1 , wherein the wiring pad and the dummy pad are spaced apart from each other in a first direction, extended in a second direction intersecting the first direction, and disposed on a same layer.
9 . The display device of claim 8 , wherein a width of the wiring pad in the first direction is greater than a width of the dummy pad in the first direction.
10 . The display device of claim 1 , further comprising:
light-emitting elements disposed on the first insulating layer, the light-emitting elements and the first insulating layer being spaced apart from the wiring pad and the dummy pad; and
a first connection electrode electrically contacting first ends of the light-emitting elements and a second connection electrode electrically contacting second ends of the light-emitting elements,
wherein the first pad electrode, the second pad electrode, the first connection electrode, and the second connection electrode comprise a same material.
11 . A display device comprising:
a wiring pad and a dummy pad disposed on a substrate and spaced apart from each other;
a planarization layer disposed over the wiring pad and the dummy pad;
a first insulating layer disposed on the planarization layer, the first insulating layer exposing a portion of the planarization layer;
a first pad electrode and a second pad electrode disposed on the planarization layer and the first insulating layer, the first pad electrode electrically connected to the wiring pad and the second pad electrode electrically connected to the dummy pad;
a second insulating layer disposed on the first pad electrode and the second pad electrode;
conductive particles disposed on the first pad electrode and the second pad electrode, the conductive particles having a cylindrical shape; and
an external device disposed on the conductive particles,
wherein:
the first pad electrode comprises first grooves formed in an upper surface,
the second pad electrode comprises second grooves formed in an upper surface, and
the first grooves and the second grooves face each other.
12 . The display device of claim 11 , wherein the first grooves are opened toward the second grooves, and the second grooves are opened toward the first grooves.
13 . The display device of claim 11 , wherein portions of first ends of the conductive particles are disposed in the first grooves, and portions of second ends of the conductive particles are disposed in the second grooves.
14 . The display device of claim 11 , wherein a depth of each of the first grooves and the second grooves is smaller than a diameter of the conductive particles.