Light-emitting device and display apparatus including the same
A light-emitting device and a display apparatus including the light-emitting device are provided. The light-emitting device includes a light-emitting cell including first and second electrodes arranged on an upper surface to be apart from each other, an extended layer in which the light-emitting cell is embedded and which has a width greater than a width of the light-emitting cell, and first and second electrode pads arranged on an upper surface of the extended layer to be apart from each other and respectively electrically connected to the first and second electrode.
1 . A light-emitting device comprising:
a light-emitting cell comprising a first electrode and a second electrode that are provided on an upper surface of the light-emitting cell, a lower surface of the light-emitting cell being exposed to outside of an extended layer of the light-emitting device;
the extended layer in which the light-emitting cell is embedded and which has a width greater than a width of the light-emitting cell; and
a first electrode pad and a second electrode pad that are provided on an upper surface of the extended layer, and are electrically connected to the first electrode and the second electrode,
wherein an interval between the first electrode pad and the second electrode pad is greater than an interval between the first electrode and the second electrode,
wherein at least one of the first electrode or the second electrode does not entirely overlap the first electrode pad and the second electrode pad, in a thickness direction of the light-emitting device,
wherein the first electrode pad is on a center axis of the extended layer,
wherein the second electrode pad is spaced apart from and at least partially surrounds the first electrode pad, and is symmetric with respect to the center axis of the extended layer.
2 . The light-emitting device of claim 1 , wherein the second electrode pad does not overlap the first electrode and the second electrode in the thickness direction of the light-emitting device.
3 . The light-emitting device of claim 1 , wherein at least one of the first electrode pad or the second electrode pad is line symmetrical or rotationally symmetrical to the center axis of the light-emitting device.
4 . The light-emitting device of claim 1 , wherein the interval between the first electrode pad and the second electrode pad is 1.5 times or more than the interval between the first electrode and the second electrode.
5 . The light-emitting device of claim 1 , wherein a width of at least one of the first electrode pad or the second electrode pad is greater than a width of the first electrode and the second electrode.
6 . The light-emitting device of claim 1 , wherein a center axis of the light-emitting device does not match a center axis of the light-emitting cell.
7 . The light-emitting device of claim 1 , wherein the light-emitting cell has a rotational asymmetric shape with respect to a center axis of the light-emitting cell.
8 . The light-emitting device of claim 7 , wherein the light-emitting cell has a polygonal cross-sectional shape.
9 . The light-emitting device of claim 1 , wherein the first electrode and the second electrode are spaced apart from each other with a center axis of the light-emitting cell therebetween.
10 . The light-emitting device of claim 1 , wherein the extended layer comprises a first region arranged at a center of the light-emitting device and a second region surrounding the first region, and
wherein the light-emitting cell is embedded in the first region.
11 . The light-emitting device of claim 10 , wherein a thickness of the first region is greater than a thickness of the second region.
12 . The light-emitting device of claim 1 , further comprising:
a first through-electrode penetrating the extended layer and having a first end in contact with the first electrode and a second end in contact with the first electrode pad; and
a second through-electrode penetrating the extended layer and having a third end in contact with the second electrode and a fourth end in contact with the second electrode pad.
13 . The light-emitting device of claim 12 , wherein at least one of the first through-electrode or the second through-electrode is bent once or more.
14 . The light-emitting device of claim 12 , wherein a partial area of the second through-electrode at least partially overlaps the first electrode pad in the thickness direction of the light-emitting device.
15 . The light-emitting device of claim 1 , wherein the light-emitting cell comprises a plurality of sub-light-emitting cells configured to emit light of different wavelengths, and
each of the first electrode pad and the second electrode pad comprises a plurality of sub electrode pads respectively electrically connected to the plurality of sub-light-emitting cells.
16 . A display apparatus comprising:
a display layer comprising a plurality of light-emitting devices; and
a driving layer comprising a plurality of transistors electrically connected to the plurality of light-emitting devices to drive the plurality of light-emitting devices,
wherein at least one of the plurality of light-emitting devices comprises:
a light-emitting cell comprising a first electrode and a second electrode provided on an upper surface of the at least one of the plurality of light-emitting devices, a lower surface of the light-emitting cell being exposed to outside of an extended layer of the at least one of the plurality of light-emitting devices;
the extended layer in which the light-emitting cell is embedded and which has a width greater than a width of the light-emitting cell; and
a first electrode pad and a second electrode pad provided on an upper surface of the extended layer and respectively electrically connected to the first electrode and the second electrode,
wherein an interval between the first electrode pad and the second electrode pad is greater than an interval between the first electrode and the second electrode, and at least one of the first electrode or the second electrode does not entirely overlap the first electrode pad and the second electrode pad, in a thickness direction of the at least one of the plurality of light-emitting devices,
wherein the first electrode pad is on a center axis of the extended layer, and
wherein the second electrode pad is spaced apart from and at least partially surrounds the first electrode pad, and is symmetric with respect to the center axis of the extended layer.
17 . The display apparatus of claim 16 , wherein the display layer further comprises a partition wall provided on the driving layer and having a plurality of holes,
the light-emitting cell is provided in one of the plurality of holes, and
an edge region of the extended layer is arranged on an upper surface of the partition wall.
18 . A display apparatus comprising:
a light-emitting cell comprising a plurality of electrodes, a lower surface of the light-emitting cell being exposed to outside of an extension layer of the display apparatus;
the extension layer that covers a top surface of the light-emitting cell and the plurality of electrodes of the light-emitting cell;
a first electrode pad and a second electrode pad that are provided on the top surface of the extension layer, wherein the first electrode pad is disposed directly above the light-emitting cell, and the second electrode pad has a circular ring shape to surround the first electrode pad; and
a plurality of through-electrodes that pass through the extension layer to connect the first electrode pad and the second electrode pad to the plurality of electrodes of the light-emitting cell, respectively,
wherein the first electrode pad and the second electrode pad are spaced from the light-emitting cell in a vertical direction of the display apparatus,
wherein an interval between the first electrode pad and the second electrode pad is greater than an interval between the plurality of electrodes of the light-emitting cell in a horizontal direction of the display apparatus,
wherein the first electrode pad is on a center axis of an extended layer, and
wherein the second electrode pad is spaced apart from and at least partially surrounds the first electrode pad, and is symmetric with respect to the center axis of the extended layer.
19 . A method of manufacturing a light-emitting device comprising:
preparing a substrate comprising a plurality of grooves;
transferring each of a plurality of light-emitting cells to the plurality of grooves such that a first electrode and a second electrode of each of the plurality of light-emitting cells are spaced apart faces out of the plurality of grooves;
forming a first through-electrode, a second through-electrode and an extended layer on a surface of each of the plurality of light-emitting cells, each of the first through-electrode and the second through-electrode in contact with the first electrode and the second electrode, a lower surface of each of the plurality of light-emitting cells being exposed to outside of the extended layer; and
forming a first electrode pad and a second electrode pad on the extended layer, each of the first electrode pad and the second electrode pad being in contact with the first through-electrode and the second through-electrode,
wherein an interval between the first electrode pad and the second electrode pad is greater than an interval between the first electrode and the second electrode,
wherein at least one of the first electrode or the second electrode does not entirely overlap the first electrode pad and the second electrode pad, in a thickness direction of the light-emitting device,
wherein the first electrode pad is on a center axis of the extended layer, and
wherein the second electrode pad is spaced apart from and at least partially surrounds the first electrode pad, and is symmetric with respect to the center axis of the extended layer.
20 . The method of claim 19 , wherein the second electrode pad does not overlap the first electrode and the second electrode in the thickness direction of the light-emitting device.
21 . The method of claim 19 , wherein a width of at least one of the first electrode pad or the second electrode pad is greater than a width of the first electrode and the second electrode.
22 . The method of claim 19 , wherein a center axis of the light-emitting device does not match a center axis of the plurality of light-emitting cells.