The inventive concept includes a substrate, a heterojunction structure including a first encapsulation layer, a graphene layer, and a second encapsulation layer sequentially stacked on the substrate, photonic crystal holes vertically penetrating the first encapsulation layer, the graphene layer, and the second encapsulation layer, and first and second electrodes respectively connected to both end portions of the heterojunction structure, The heterojunction structure includes buffer areas contacting the first and second electrodes, respectively, and emission areas between the buffer areas, The photonic crystal holes are provided in the emission area, and the width of the emission area is smaller than the widths of the buffer areas to provide a light source using a photonic crystal structure. In addition, a light source using the photonic crystal structure may be utilized as a photodetector.

A micro light-emitting device, including a first type semiconductor layer, a light-emitting layer, a second type semiconductor layer, a first type electrode, a second type electrode, and a light reflection layer, is provided. The light-emitting layer is arranged on the first type semiconductor layer. The second type semiconductor layer is arranged on the light-emitting layer. The first type electrode and the second type electrode are both arranged on the second type semiconductor layer. The light reflection layer is arranged between the light-emitting layer and the first type electrode. The light reflection layer includes an oxidized area and a non-oxidized area. A reflectance of the oxidized area is greater than a reflectance of the non-oxidized area. An orthographic projection of a part of the oxidized area on the first type semiconductor layer and an orthographic projection of the first type electrode on the first type semiconductor layer at least partially overlap.

A micro light-emitting device, including a first type semiconductor layer, a light-emitting layer, a second type semiconductor layer, a first type electrode, a second type electrode, and a light reflection layer, is provided. The light-emitting layer is arranged on the first type semiconductor layer. The second type semiconductor layer is arranged on the light-emitting layer. The first type electrode and the second type electrode are both arranged on the second type semiconductor layer. The light reflection layer is arranged between the light-emitting layer and the first type electrode. The light reflection layer includes an oxidized area and a non-oxidized area. A reflectance of the oxidized area is greater than a reflectance of the non-oxidized area. An orthographic projection of a part of the oxidized area on the first type semiconductor layer and an orthographic projection of the first type electrode on the first type semiconductor layer at least partially overlap.

A display device includes: a substrate; a bank having a first main opening and sub-openings extending from the first main opening; a first electrode and a second electrode on the first substrate and being spaced apart from each other in a first direction and extending in a second direction; a plurality of light-emitting elements on the first electrode and the second electrode and being spaced apart from each other in the second direction; a first connection electrode on the first electrode and contacting first ends of the light-emitting elements; and a second connection electrode on the second electrode and contacting second ends of the light-emitting elements. The first connection electrode is connected to the first electrode through a first contact, and the second connection electrode is connected to the second electrode through a second contact on the second electrode. The first contact and the second contact overlap the sub-openings.

A display device including a plurality of pixels, each of the pixels including a first area and a second area and including: a first electrode and a second electrode in the first area; a plurality of light-emitting elements located between the first electrode and the second electrode in the first area; a first insulating layer in the first area and the second area; and a second insulating layer on the first insulating layer, wherein the first insulating layer includes a first opening in the second area, the second insulating layer includes a second opening overlapping the first opening, and a width of the first opening in a first direction is greater than a width of the second opening in the first direction.

A display device including a plurality of pixels, each of the pixels including a first area and a second area and including: a first electrode and a second electrode in the first area; a plurality of light-emitting elements located between the first electrode and the second electrode in the first area; a first insulating layer in the first area and the second area; and a second insulating layer on the first insulating layer, wherein the first insulating layer includes a first opening in the second area, the second insulating layer includes a second opening overlapping the first opening, and a width of the first opening in a first direction is greater than a width of the second opening in the first direction.

A display device comprises a first electrode and a second electrode on a substrate, a first insulating layer on the first electrode and the second electrode, light emitting elements on the first insulating layer each having a first end on the first electrode and a second end on the second electrode, a first connection electrode disposed on the first electrode and electrically contacting the first end of each of the light emitting elements, a second connection electrode disposed on the second electrode and electrically contacting the second end of each of the light emitting elements, a second insulating layer on the light emitting elements, the first connection electrode and the second connection electrode, and a third connection electrode disposed on the second insulating layer and electrically contacting the light emitting elements through an opening formed in the second insulating layer that partially exposes the light emitting elements.

A light emitting device includes a mount board that includes a wiring pattern on an upper surface, and light emitting elements that are mounted at corresponding one of mounting positions on the wiring pattern to be connected in series and/or in parallel to each other through the wiring pattern. The light emitting elements each include a pair of electrodes on a back surface side thereof. The mounting positions include four or more connection terminals that are electrically separated from each other to connect the electrodes of their corresponding light emitting element to each other. Series connection and parallel connection numbers are determined in accordance with orientations of the light emitting elements in which each electrode straddles at least adjacent two of the four or more connection terminals that are spaced away from and adjacent to each other.

A light emitting device includes a mount board that includes a wiring pattern on an upper surface, and light emitting elements that are mounted at corresponding one of mounting positions on the wiring pattern to be connected in series and/or in parallel to each other through the wiring pattern. The light emitting elements each include a pair of electrodes on a back surface side thereof. The mounting positions include four or more connection terminals that are electrically separated from each other to connect the electrodes of their corresponding light emitting element to each other. Series connection and parallel connection numbers are determined in accordance with orientations of the light emitting elements in which each electrode straddles at least adjacent two of the four or more connection terminals that are spaced away from and adjacent to each other.

A display device and a method of repairing the same, where the display device includes a substrate, a first electrode, a second electrode, and a third electrode on the substrate and sequentially arranged along a first direction, at least one first light emitting element between the first electrode and the second electrode, at least one second light emitting element between the second electrode and the third electrode, a first contact electrode that is in contact with the first electrode and one end of the first light emitting element, a second contact electrode having one side that is in contact with another end of the first light emitting element and another side that is in contact with the third electrode and one end of the second light emitting element, a third contact electrode that is in contact with the second electrode and another end of the second light emitting element.