Display device and manufacturing method therefor
A display device may include a substrate including pixel areas each having first and second areas, and pixels disposed in the pixel areas. The pixels may include a pixel circuit part which is disposed in the first area and including a bottom metal layer disposed on the substrate and at least one transistor disposed on the bottom metal layer. A display element part may be disposed at the second area and include a first electrode and a second electrode that are spaced apart from each other, and light emitting diodes disposed between the first and second electrodes to emit light. The first and second electrodes and the bottom metal layer may be disposed on a same layer.
1 . A display device comprising:
a substrate including pixel areas; and
a pixel disposed in each pixel area of the pixel areas,
wherein:
the pixel includes a pixel circuit part and a display element part, and the pixel circuit part is disposed in a first area and includes:
a bottom metal layer disposed on the substrate;
at least one transistor disposed above the bottom metal layer; and
at least one insulating layer above the transistor; and
the display element part is disposed in a second area and includes:
a first electrode and a second electrode spaced apart from each other;
light-emitting elements disposed between the first electrode and the second electrode to emit light;
a first contact electrode above the light-emitting elements to electrically connect the first electrode to a first end of the light-emitting elements and a second contact electrode above the light-emitting elements to electrically connect the second electrode to a second end of the light-emitting elements; and
the at least one insulating layer vertically between the first electrode and the first contact electrode and vertically between the second electrode and the second contact electrode, and
wherein the first electrode, the second electrode, and the bottom metal layer are formed of a same layer.
2 . The display device of claim 1 , wherein:
each of the pixel circuit part and the display element part include a first insulating layer, a second insulating layer, a third insulating layer, and a fourth insulating layer that are sequentially disposed on the substrate;
the pixel circuit part includes a first conductive layer disposed between the substrate and the first insulating layer, a second conductive layer disposed on the first insulating layer, a third conductive layer disposed on the second insulating layer, and a fourth conductive layer disposed on the fourth insulating layer;
the display element part includes the first conductive layer disposed between the substrate and the first insulating layer and the fourth conductive layer disposed on the fourth insulating layer;
the at least one insulating layer includes the fourth insulating layer; and
the first conductive layer includes the bottom metal layer, the first electrode, and the second electrode.
3 . The display device of claim 2 , wherein:
the second area includes an emission area from which the light is emitted;
the third insulating layer is disposed on the first and second electrodes in the emission area to expose a portion of each of the first and second electrodes; and
the fourth insulating layer is disposed on one surface of each of the light-emitting elements in the emission area to expose the first end of the light-emitting elements and the second end of the light-emitting elements.
4 . The display device of claim 3 , wherein the fourth insulating layer exposes the first end of the light-emitting elements and the second end of the light-emitting elements.
5 . The display device of claim 3 , wherein:
the fourth conductive layer includes the first contact electrode and the second contact electrode.
6 . The display device of claim 5 , wherein:
the substrate includes a display area in which the pixel areas are disposed and a non-display area that surrounds at least one side of the display area;
a line part electrically connected to the pixel circuit part and a pad part electrically connected to the line part are disposed in the non-display area; and
the pad part includes:
a first pad electrode disposed on the second insulating layer; and
a second pad electrode disposed on the first pad electrode and in electrical contact with the first pad electrode.
7 . The display device of claim 6 , wherein:
the second pad electrode is disposed on the fourth insulating layer; and
the fourth conductive layer includes the second pad electrode.
8 . The display device of claim 7 , wherein the first contact electrode, the second contact electrode, and the second pad electrode are disposed on a same layer.
9 . The display device of claim 7 , further comprising a protective layer disposed between the third insulating layer and the fourth insulating layer,
wherein the protective layer is disposed in each of the non-display area, the first area, and a portion of the second area except for the emission area.
10 . The display device of claim 9 , further comprising a light blocking layer disposed on the protective layer.
11 . The display device of claim 10 , wherein the light blocking layer includes a black matrix.
12 . The display device of claim 10 , further comprising a light conversion pattern layer disposed in the emission area of the second area and disposed on the first contact electrode and the second contact electrode.
13 . The display device of claim 12 , further comprising a fifth insulating layer disposed on the light conversion pattern layer.
14 . The display device of claim 2 , wherein:
the transistor includes:
an active pattern disposed on the first insulating layer;
a gate electrode disposed on the second insulating layer and overlapping the active pattern; and
a first terminal and a second terminal that are in electrical contact with both ends of the active pattern; and
the second conductive layer includes the gate electrode.
15 . A method of manufacturing a display device, the method comprising:
providing a substrate including pixel areas; and
providing a pixel in each pixel area of the pixel areas,
wherein the providing of the pixel includes:
forming a first conductive layer on the substrate;
wherein:
the pixel includes a pixel circuit part and a display element part, and the pixel circuit part is disposed in a first area and includes:
a bottom metal layer disposed on the substrate;
at least one transistor disposed above the bottom metal layer; and
at least one insulating layer above the transistor; and
the display element part is disposed in a second area and includes:
a first electrode and a second electrode spaced apart from each other;
light-emitting elements disposed between the first electrode and the second electrode to emit light;
a first contact electrode above the light emitting elements to electrically connect the first electrode to a first end of the light emitting elements and a second contact electrode above the light emitting elements to electrically connect the second electrode to a second end of the light emitting elements; and
the at least one insulating layer vertically between the first electrode and the first contact electrode and vertically between the second electrode and the second contact electrode; and
wherein the first electrode, the second electrode, and the bottom metal layer are formed of the first conductive layer.
16 . The method of claim 15 , wherein:
the substrate includes:
a display area in which the pixel area is disposed; and
a non-display area which surrounds at least one side of the display area; and
the non-display area includes:
a first pad electrode; and
a second pad electrode in electrical contact with the first pad electrode.
17 . The method of claim 16 , wherein:
the second pad electrode, the first contact electrode, and the second contact electrode are formed through a same process.
18 . The method of claim 17 , further comprising:
forming a light blocking layer,
forming a light conversion pattern layer on the light blocking layer; and
forming an additional insulating layer on the light conversion pattern layer.