A display device includes a display panel having first and second regions with the second region having a higher resolution than the first region and an electronic module under the first region. The display panel includes first and second emission layers in a first sub-region of the first region with the second emission layer being spaced apart from the first emission layer. The first emission layer has a first light-emitting portion and a second light-emitting portion adjacent to the first light-emitting portion in a first direction, and the second emission layer has a third light-emitting portion and a fourth light-emitting portion adjacent to the third light-emitting portion in the first direction. The first light-emitting portion is inclined from the second light-emitting portion toward a lower surface of the display panel, and the fourth light-emitting portion is inclined from the third light-emitting portion toward an upper surface of the display panel.

A solar cell includes a first substrate, a first hole transport layer, a first photoelectric conversion layer containing a perovskite compound, and a second photoelectric conversion layer containing a photoelectric conversion material in this order. A band gap of the perovskite compound is greater than a band gap of the photoelectric conversion material. With respect to an absorption wavelength of the first photoelectric conversion layer 3, a refractive index n.sub.A of the first hole transport layer 2 satisfies refractive index of the first substrate≤n.sub.A≤refractive index of the first photoelectric conversion layer. Further, with respect to a transmission wavelength of the first photoelectric conversion layer 3 and an absorption wavelength of the second photoelectric conversion layer 5, a refractive index n.sub.B of the first hole transport layer 2 satisfies refractive index of the first substrate≤n.sub.B≤refractive index of the first photoelectric conversion layer.

A fabrication method for a light-emitting device includes providing a hole functional layer disposed between a quantum dot light-emitting layer and an anode, and providing an electron functional layer disposed between the quantum dot light-emitting layer and a cathode. The hole functional layer includes a mixed material of a hole transport material and a hole injection material. A thickness of the hole functional layer being selected from a thickness range corresponding to ⅓˜⅔ of abscissa between an origin and a first positive trough in a cavity standing wave of the mixed material. The absolute value of a difference between a thickness of the electron functional layer and a thickness corresponding to a first positive crest of a cavity standing wave of an electron functional material is less than or equal to 5 nm.

A light-emitting device includes: a first electrode; a second electrode facing the first electrode; and an interlayer between the first electrode and the second electrode and including an emission layer, wherein the interlayer may include a layer including a metal oxide, and a surface of the layer including a metal oxide is an organic acid-treated surface.

An organic light emitting display (OLED) device includes a substrate, a semiconductor element on the substrate, a planarization layer on the semiconductor, and a light emitting structure on the planarization layer. The planarization layer includes a contact hole exposing a portion of the semiconductor and a plurality of grooves surrounding the contact hole. The light emitting structure is electrically connected to the semiconductor element via the contact hole.

The present disclosure provides an OLED display substrate, a fabricating method thereof and a display device. The OLED display substrate includes a substrate; an inorganic layer and a light-emitting unit on substrate, light-emitting unit being on a side of inorganic layer away from substrate and including a light-emitting structure; a camera on a side of substrate away from inorganic layer, and light-emitting unit being not in orthographic projection region; a protective layer in orthographic projection region and on side of inorganic layer away from substrate, wherein protective layer is configured to protect inorganic layer in orthographic projection region from warping or cracking in a process of removing part of light-emitting structure in orthographic projection region by laser cutting.

A foldable organic light emitting diode (OLED) display panel and an OLED display screen having the fordable OLED display panel are provided. The foldable OLED display panel is provided with an effective display area and a non-display area. The effective display area has a folding region, a first display area and a second display area. The first display area and the second display area are disposed adjacent two lateral sides of the folding region, respectively. The foldable OLED display panel has a first spacer, a second spacer, and an encapsulation layer having a first organic layer and a first inorganic layer. The first organic layer is coated within the folding region and restricted to the folding region by the first spacer and the second spacer. The first inorganic layer is disposed on the first organic layer and completely covers the effective display area.

A display apparatus includes: a base substrate including a display area and a non-display area adjacent to the display area; a first power supply wire in the non-display area, a first power supply voltage being applied to the first power supply wire; a second power supply wire in the non-display area and spaced apart from the first power supply wire, a second power supply voltage being applied to the second power supply wire; and a dam overlapping the first power supply wire and the second power supply wire, having a first height on the first power supply wire, and having a second height greater than the first height between the first power supply wire and the second power supply wire.

A heterocyclic compound represented by Formula 1: ##STR00001## wherein, in Formula 1, groups and variables are the same as described in the specification.

A display device includes: a substrate including a display area and a non-display area; a circuit portion including a first circuit portion and a second circuit portion on the non-display area; a valley portion separating the first circuit portion and the second circuit portion from each other; and a thin film encapsulation layer sealing the display area, the thin film encapsulation layer extending from the display area to the valley portion, and the first circuit portion is between the valley portion and the display area, the second circuit portion is at an outside of the valley portion, an internal layer on the first circuit portion includes a plurality of island portions that are apart from one another in a first direction and a second direction crossing the first direction, and an external layer on the second circuit portion includes at least one groove extending in the first direction.