Light-emitting device and display device using the same
A light-emitting device and a display device using the same. The light-emitting device improves the reliability of a process of disposing light-emitting devices. The light-emitting device is configured to ensure electrical connections even if the light-emitting device is inverted while being disposed on a substrate. The light-emitting device includes an n-type semiconductor layer and a p-type semiconductor layer. N-type electrodes and p-type electrodes are disposed on both sides of top and bottom surfaces of the light-emitting device. Contact holes are provided to electrically connect one of the n-type electrodes to the n-type semiconductor layer and one of the p-type electrodes to the p-type semiconductor layer. When the light-emitting device is inverted while being disposed on a substrate, the light-emitting device operates ordinarily, thereby reducing the defect rate of a display device.
1. A light-emitting device, comprising:
an n-type semiconductor layer;
a p-type semiconductor layer;
an active layer, the n-type semiconductor layer being disposed on a first side of the active layer, the p-type semiconductor layer being disposed on a second side of the active layer opposite to the first side; and
n-type electrodes and p-type electrodes disposed on both sides of the light-emitting device, such that an electrical connection is provided, even in a case in which the light-emitting device is inverted while being disposed on a substrate,
wherein the n-type semiconductor layer is directly electrically connected to a first n-type electrode among the n-type electrodes, the first n-type electrode being located on a first surface of the n-type semiconductor layer,
wherein the p-type semiconductor layer is directly electrically connected to a first p-type electrode among the p-type electrodes, the first p-type electrode being located on a first surface of the p-type semiconductor layer,
wherein the n-type semiconductor layer is electrically connected to a second n-type electrode among the n-type electrodes, the second n-type electrode being located on a second surface of the n-type semiconductor layer, opposite to the first surface of the n-type semiconductor layer, through a contact hole passing through the p-type semiconductor layer and the active layer,
wherein the p-type semiconductor layer is electrically connected to a second p-type electrode among the p-type electrodes, the second p-type electrode being on a second surface of the p-type semiconductor opposite to the first surface of the p-type semiconductor layer, the second p-type electrode surrounding the n-type semiconductor layer,
wherein the first n-type electrode directly electrically connected to the n-type semiconductor layer and the second n-type electrode electrically connected to the n-type semiconductor layer through the contact hole are physically separated each other, and
wherein the first p-type electrode directly electrically connected to the p-type semiconductor layer and the second p-type electrode electrically connected to the p-type semiconductor layer are physically separated each other.
2. The light-emitting device according to claim 1 , wherein one electrode selected from among the n-type electrodes or the p-type electrodes is disposed to surround peripheral portions of one surface of the light-emitting device.
3. The light-emitting device according to claim 1 , wherein one electrode selected from among the n-type electrodes or the p-type electrodes is disposed on a central portion of one surface of the light-emitting device.
4. The light-emitting device according to claim 1 , further comprising:
a first insulating layer in the contact hole to insulate the second n-type electrode from the p-type semiconductor layer and the active layer; and
a second insulating layer surrounding the n-type semiconductor layer and the active layer to insulate the second p-type electrode from the n-type semiconductor layer and the active layer.