Display device with an improved alignment degree of light emitting elements and method for manufacturing the same
A display device may include a substrate including pixel areas, and a pixel disposed in each of the pixel area. The pixel may include a transistor and a driving voltage line disposed in the substrate, first and second electrodes spaced apart from each other, a bank pattern disposed on the first and second electrodes, respectively, intermediate layers disposed on the bank pattern, light emitting elements disposed between two adjacent intermediate layers of the intermediate layers, a first contact electrode disposed on one of the two adjacent intermediate layers and electrically connected to an end of each of the light emitting elements, and a second contact electrode disposed on another one of the two adjacent intermediate layers and electrically connected to another end of each of the light emitting elements.
1 . A display device comprising:
a substrate including a display area including a plurality of pixel areas and a non-display area surrounding the display area; and
a pixel disposed in each of the pixel areas,
wherein the pixel comprises:
at least one transistor and a driving voltage line disposed on the substrate;
a first electrode and a second electrode extending in a direction on the transistor and the driving voltage line and spaced apart from each other;
a bank pattern disposed on the first and second electrodes, respectively, the bank pattern having a plurality of elongated bar portions with a length extending along the direction;
intermediate layers disposed on the bank pattern;
light emitting elements disposed between two adjacent intermediate layers of the intermediate layers in another direction intersecting the direction;
a first contact electrode disposed on one of the two adjacent intermediate layers and electrically connected to an end of each of the light emitting elements; and
a second contact electrode disposed on another one of the two adjacent intermediate layers and electrically connected to another end of each of the light emitting elements.
2 . The display device according to claim 1 , wherein each of the intermediate layers includes an insulating material.
3 . The display device according to claim 2 , wherein
each of the intermediate layers is a multi-layer including at least three or more double layers formed by stacking a first inorganic insulating layer and a second inorganic insulating layer, and
the at least three or more double layers are sequentially stacked.
4 . The display device according to claim 3 , wherein a refractive index of the first inorganic insulating layer and a refractive index of the second inorganic insulating layer are different from each other.
5 . The display device according to claim 1 , wherein
one of the first and second contact electrodes is electrically connected to the transistor, and
another one of the first and second contact electrodes is electrically connected to the driving voltage line.
6 . The display device according to claim 5 , wherein the first electrode and the second electrode are disposed on a same layer.
7 . The display device according to claim 5 , wherein the first electrode and the second electrode are disposed on different layers.
8 . The display device according to claim 1 , wherein each of the first and second electrodes extends in the direction and is commonly provided to adjacent pixels positioned in a same pixel column as the pixel.
9 . The display device according to claim 1 , wherein each of the intermediate layers includes a conductive material.
10 . The display device according to claim 9 , wherein
the one of the intermediate layers is disposed in the pixel, and
the another one of the intermediate layers is commonly provided to the pixel and adjacent pixels in a same column as the pixel.
11 . The display device according to claim 9 , wherein the pixel further includes an insulating layer disposed between the first and second electrodes and the bank pattern.
12 . The display device according to claim 11 , wherein
the one of the intermediate layers and one of the first and second electrodes form a capacitor with the insulating layer and a bank pattern corresponding to the one of the first and second electrodes disposed between the one of the intermediate layers and the one of the first and second electrodes, and
the another one of the intermediate layers and another one of the first and second electrodes form a capacitor with the insulating layer and a bank pattern corresponding to the remaining electrode disposed between the another one of the intermediate layers and the another one of the first and second electrodes.
13 . The display device according to claim 11 , wherein
the pixel further includes a first sub-electrode and a second sub-electrode disposed on the insulating layer, extending in the direction, and spaced apart from each other,
wherein the first sub-electrode overlaps the first electrode in a plan view, and
wherein the second sub-electrode overlaps the second electrode in a plan view.
14 . The display device according to claim 13 , wherein
the first electrode and the first sub-electrode form a capacitor with the insulating layer disposed between the first electrode and the first sub-electrode, and
the second electrode and the second sub-electrode form a capacitor with the insulating layer disposed between the second electrode and the second sub-electrode.
15 . The display device according to claim 14 , wherein
the one of the intermediate layers covers the first sub-electrode and is electrically connected to the first sub-electrode, and
the another one of the intermediate layers covers the second sub-electrode and is electrically connected to the second sub-electrode.
16 . The display device according to claim 1 , wherein the intermediate layers overlap the first and second electrodes in a plan view.
17 . A method of manufacturing a display device, the method comprising:
providing a pixel disposed in each pixel area;
the providing of the pixel comprises:
forming at least one transistor and a driving voltage line on a substrate;
forming an interlayer insulating layer on the at least one transistor and the driving voltage line;
forming a first electrode and a second electrode extending in a direction and spaced apart from each other on the interlayer insulating layer;
forming a bank pattern on the first and second electrodes, the bank pattern having a plurality of elongated bar portions with a length extending along the direction;
forming intermediate layers on the bank pattern;
inputting light emitting elements, and aligning the light emitting elements between two adjacent intermediate layers of the intermediate layers adjacent in another direction intersecting the direction, by applying an alignment signal corresponding to each of the first electrode and the second electrode;
forming an insulating layer on an upper surface of each of the light emitting elements; and
forming a first contact electrode and a second contact electrode on the insulating layer.
18 . The method according to claim 17 , wherein each of the intermediate layers includes a conductive material.
19 . The method according to claim 17 , wherein each of the intermediate layers includes an insulating material.
20 . The method according to claim 19 , wherein
each of the intermediate layers includes a multi-layer including at least three or more double layers formed by stacking a first inorganic insulating layer and a second inorganic insulating layer,
the at least three or more double layers are sequentially stacked, and
a refractive index of the first inorganic insulating layer and a refractive index of the second inorganic insulating layer are different from each other.