Display device and method for manufacturing same
Provided are a display device and a method for manufacturing the same. The display device includes banks extending in a first direction on a substrate and spaced apart from each other; a first electrode and a second electrode extending in the first direction and spaced apart from each other on different banks; an insulation layer disposed on the substrate and partially covering the first electrode and the second electrode; and light emitting elements disposed on the insulation layer and having ends disposed on the first electrode and the second electrode wherein the first electrode and the second electrode generate an electric field when a magnetic field is applied to the first electrode and the second electrode.
1 . A display device comprising:
banks extending in a first direction on a substrate, the banks spaced apart from each other;
first electrodes and second electrodes extending in the first direction, the first electrodes and the second electrodes disposed on different banks and spaced apart from each other;
an insulating layer disposed on the substrate, the insulating layer partially covering the first electrodes and the second electrodes; and
light-emitting elements disposed on the insulating layer, end portions of each of the light-emitting elements disposed on the first electrodes and the second electrodes,
wherein the first electrodes and the second electrodes generate an electric field in response to an applied magnetic field.
2 . The display device of claim 1 , wherein the first electrodes and the second electrodes have a reflectance in a range of about 20 to about 85% for a wavelength band in a range of about 400 nm to about 700 nm.
3 . The display device of claim 1 , wherein the first electrodes and the second electrodes have a Curie temperature of about 800° C. or less.
4 . The display device of claim 1 , wherein the first electrodes and the second electrodes include at least one selected from BiFeO 3 , hexa-ferrites, TbMn 2 O 5 , and CoCr 2 O 4 .
5 . The display device of claim 1 , wherein, the first electrodes and the second electrodes generate a magnetic field in response to an applied electric field.
6 . The display device of claim 1 , further comprising:
a reflective layer disposed between the first electrodes and the insulating layer and between the second electrodes and the insulating layer.
7 . The display device of claim 6 , wherein the reflective layer has a higher reflectance than a reflectance of the first electrodes or the second electrodes.
8 . The display device of claim 1 , further comprising:
a first contact electrode disposed on the first electrodes electrically contacting first end portions of the light-emitting elements; and
a second contact electrode disposed on the second electrodes electrically contacting second end portions of the light-emitting elements.
9 . The display device of claim 1 , wherein
each of the light-emitting elements includes:
a first semiconductor layer;
a second semiconductor layer; and
at least one light-emitting layer disposed between the first semiconductor layer and the second semiconductor layer, and
the first semiconductor layer, the second semiconductor layer, and the at least one light-emitting layer are surrounded by an insulating film.
10 . A method of manufacturing a display device, comprising:
preparing a substrate including first electrode layers and second electrode layers, and spraying ink including a solvent and light-emitting elements dispersed in the solvent onto the substrate;
generating a first electric field on the substrate and primarily aligning light-emitting elements on the first electric field on the substrate; and
generating a second electric field by applying a magnetic field to the first electrode layers or the second electrode layers, and secondarily aligning the light-emitting elements on the substrate.
11 . The method of claim 10 , wherein the first electric field is generated by a current flowing into the first electrode layers or the second electrode layers.
12 . The method of claim 10 , wherein in the secondarily aligning of the light-emitting elements, the magnetic field is applied to the first electrode layers or the second electrode layers by application of an external coil.
13 . The method of claim 12 , wherein the first electrode layers or the second electrode layers generate the second electric field in accordance with an intensity of the magnetic field.
14 . The method of claim 13 , wherein the light-emitting elements are rotated and realigned by inducing dipole moments in the light-emitting elements with the second electric field to apply a rotational torque to the light-emitting elements.
15 . The method of claim 14 , wherein the rotational torque is applied to the light-emitting elements by a magnetic force of the first electrode layers or the second electrode layers to which the magnetic field is applied.
16 . The method of claim 10 , wherein after the primarily aligning of the light-emitting elements,
a degree of alignment of the light-emitting elements is measured from an area to another area of the substrate, and
the magnetic field is applied to areas where the degree of alignment of the light-emitting elements is low.
17 . The method of claim 16 , wherein the degree of alignment of the light-emitting elements is measured by acquiring an image of each area of the substrate by an inspection device including a camera, and measuring an orientation direction of the light-emitting elements.
18 . The method of claim 17 , wherein the orientation direction of the light-emitting elements is measured by measuring locations of end portions of each of light-emitting elements disposed between the first electrode layers and the second electrode layers.
19 . The method of claim 10 , further comprising:
after the secondarily aligning of the light-emitting elements, removing the solvent and fixing the light-emitting elements such that first end portions of the light-emitting elements are disposed on the first electrode layers and second end portions of the light-emitting elements are disposed on the second electrode layers.
20 . The method of claim 19 , further comprising:
forming an insulating layer on the substrate with the solvent removed and disconnecting parts of the first electrode layers and the second electrode layers.