A lighting device having a support supporting first light emitting diodes and second light emitting diodes each having a light emitting surface, wherein the light emitting surface of each first light emitting diode has a first area and the light emitting surface of each second light emitting diode has a second area, the second area being strictly lower than the first area.

A display device includes a bank layer disposed on a substrate and defining a light-emitting area and a sub-area, a first electrode and a second electrode spaced apart from each other and extending from the light-emitting area to the sub-area, a plurality of light-emitting elements disposed on the first electrode and the second electrode in the light-emitting area, a plurality of dummy light-emitting elements disposed on the first electrode and the second electrode in the sub-area, a first connection electrode in electrical contact with an end of each of the plurality of light-emitting elements, and a second connection electrode in electrical contact with another end of each of the plurality of light-emitting elements. The sub-area includes an isolation area in which each of the first electrode and the second electrode is disconnected, and the plurality of dummy light-emitting elements are not disposed in the isolation area.

A display device includes a bank layer disposed on a substrate and defining a light-emitting area and a sub-area, a first electrode and a second electrode spaced apart from each other and extending from the light-emitting area to the sub-area, a plurality of light-emitting elements disposed on the first electrode and the second electrode in the light-emitting area, a plurality of dummy light-emitting elements disposed on the first electrode and the second electrode in the sub-area, a first connection electrode in electrical contact with an end of each of the plurality of light-emitting elements, and a second connection electrode in electrical contact with another end of each of the plurality of light-emitting elements. The sub-area includes an isolation area in which each of the first electrode and the second electrode is disconnected, and the plurality of dummy light-emitting elements are not disposed in the isolation area.

A light emitting element includes a first semiconductor layer; an emission layer disposed on the first semiconductor layer; a second semiconductor layer disposed on the emission layer; an electrode layer disposed on the second semiconductor layer; and an insulating film surrounding side surfaces of the first semiconductor layer, the emission layer, and the second semiconductor layer and surrounding a portion of the electrode layer at an end portion of the light emitting element on which the electrode layer is disposed. The electrode layer includes a first surface adjacent to the second semiconductor layer; a second surface facing the first surface and having a width less than a width of the first surface; and a side surface that connects the first surface and the second surface and has a slope in a range of about 75 to about 90 with respect to the first surface of the electrode layer.

A light-emitting element includes a first semiconductor layer, a second semiconductor layer opposite to the first semiconductor layer, and a light-emitting layer between the first semiconductor layer and the second semiconductor layer, in which planar shapes of the first semiconductor layer, the second semiconductor layer, and the light-emitting layer each include at least one first side with a straight shape, and at least one second side with a curved shape.

A stretchable display device includes a display area including a first display area and a second display area adjacent to each other in a first direction; a plurality of rigid portions in the display area and spaced apart from each other in the first direction and a second direction; and a soft portion between adjacent rigid portions, among the plurality of rigid portions, in the first direction and the second direction, wherein the plurality of rigid portions include first, second, and third rigid portions, wherein the first rigid portion is provided in the first display area, and the second rigid portion is provided in the second display area, and wherein the third rigid portion is disposed between the first rigid portion and the second rigid portion and has a larger area than each of the first and second rigid portions.

A display panel and a display device are provided. The display panel includes: a display region and a non-display region, the non-display region surrounds the display region, the display region includes a first display region and a second display region, the first display region surrounds the periphery of the second display region, a plurality of first pixels is arranged in the first display region, a plurality of second pixels is arranged in the second display region, the display region includes a first driving circuit configured to drive the first pixels and a second driving circuit configured to drive the second pixels; and one first driving circuit is configured to simultaneously drive at least two first pixels.

A metal stack of layers contacting an N-type layer of a light emitting diode (LED) device comprises: an ohmic contact layer electrically contacting the N-type layer and having a work function value that is less than or equal to a work function value of the N-type layer; a reflective layer electrically contacting the ohmic contact layer; a first material barrier layer electrically contacting the reflective layer; a current carrying layer electrically contacting the first material barrier layer; and a second material barrier layer electrically contacting the current carrying layer. LED devices incorporate the metal stack of layer as a bonding material and/or as an ohmic contact-reflective material. Methods of making and using the metal stacks and LED devices are also provided.

A display device includes a first barrier layer disposed on a substrate, a lower metal layer disposed on the first barrier layer, and a semiconductor layer disposed on the lower metal layer. In a cross-sectional view, the lower metal layer includes a first part spaced apart from the semiconductor layer and a second part closer to the semiconductor layer, in a plan view, an area of the second part is smaller than an area of the first part, and a side of the semiconductor layer and a side of the second part, which is adjacent to the semiconductor layer, are parallel to each other.

A display device includes a first barrier layer disposed on a substrate, a lower metal layer disposed on the first barrier layer, and a semiconductor layer disposed on the lower metal layer. In a cross-sectional view, the lower metal layer includes a first part spaced apart from the semiconductor layer and a second part closer to the semiconductor layer, in a plan view, an area of the second part is smaller than an area of the first part, and a side of the semiconductor layer and a side of the second part, which is adjacent to the semiconductor layer, are parallel to each other.