A display apparatus includes a pixel electrode disposed on a substrate, a pixel defining layer having an opening exposing a central portion of the pixel electrode, an electrically conductive partition wall disposed on the pixel defining layer and having a height of about 500 or greater, an intermediate layer disposed on the pixel electrode and including an emission layer and a plurality of common layers, and an opposite electrode disposed on the intermediate layer, wherein at least a portion of the intermediate layer is in direct contact with at least a portion of the electrically conductive partition wall.

A display apparatus including a light-emitting device is provided. The light-emitting device may be disposed on an emission area. A light-emitting unit of the light-emitting device may include a charge generation layer between a first emission stack and a second emission stack. A non-emission area may be disposed outside the emission area. A bank insulating layer may be disposed on the non-emission area. The charge generation layer may extend onto the bank insulating layer. A first region of the charge generation layer overlapping with the bank insulating layer may have a resistance greater than a second region of the charge generation layer overlapping with the emission area. Thus, in the display apparatus, light leakage due to leakage current may be prevented.

A display device in which each of first to third light emitting devices includes a first electrode disposed on a substrate, a first hole transport layer disposed on the first electrode, and a first light emitting layer disposed on the first hole transport layer, wherein each of the first and second light emitting devices includes a first optical layer disposed between the first hole transport layer and the first light emitting layer, and a thickness of the first optical layer of the first light emitting device is the same as a thickness of the first optical layer of the second light emitting device.

The disclosure provides a display panel, a display device and a preparation method for the display panel. The display panel includes: a substrate having a first side; a light-emitting unit arranged on the first side, the light-emitting unit including a first hole transport layer; and a photoelectric sensor unit arranged on the first side, sensor unit and the photoelectric sensor unit includes a second hole transport layer, a photoelectric conversion layer and a buffer layer, the buffer layer being arranged on a side of the photoelectric conversion layer facing the second hole transport layer; where the first hole transport layer and the second hole transport layer are made of the same material, the buffer layer has a first electrical conductivity, and the second hole transport layer has a second electrical conductivity, the first electrical conductivity being greater than the second electrical conductivity.

A display device including: a display layer including a light emitting device, a photo-detector, and a dummy device; and a circuit layer including a pixel driving part, which is connected to the light emitting device, and a sensor driving part which is connected to the photo-detector, wherein the light emitting device and the dummy device are overlapped with the pixel driving part, and wherein the photo-detector is overlapped with the sensor driving part.

A display substrate is provided, including: a base substrate and a first electrode, a first light-emitting layer, a first hole blocking layer, a first electron transport layer, an electron injection layer, a second electrode, an optical extraction layer, a protective layer, and an encapsulation layer that are sequentially arranged on the base substrate in a direction away from the base substrate. A refractive index of a material of the optical extraction layer is greater than a refractive index of a material of the encapsulation layer, and the refractive index of the material of the encapsulation layer is greater than a refractive index of a material of the second electrode.

A light-emitting device enabling a light-emitting apparatus that has high resolution, high reliability, and low manufacturing cost to be achieved is provided. A light-emitting device to be provided includes a first electrode, a second electrode, and a first layer and a second layer provided therebetween. The first layer is positioned closer to the first electrode than the second layer is. The first electrode and the first layer are independent layers for each light-emitting device. The second electrode and the second layer are continuous layers shared by a plurality of light-emitting devices. The first layer includes a layer containing a light-emitting substance and a first electron-transport layer. The second layer includes a second electron-transport layer. The first electron-transport layer is positioned between the light-emitting layer and the second electron-transport layer. The first electron-transport layer contains a first compound having an electron-transport property and a glass transition temperature higher than or equal to 110 C. The second electron-transport layer contains a second compound having an electron-transport property.

A display device is provided to include a substrate, a plurality of sub-pixels supported by the substrate and configured to emit light of different colors, a transparent layer disposed in the plurality of sub-pixels, a first protective layer disposed on the transparent layer, and a second protective layer disposed on the first protective layer, wherein a sub-pixel of the plurality of sub-pixels includes a light-emitting area which emits light, and a non-light-emitting area around the light-emitting area, and the first protective layer and the second protective layer are structured to expose the transparent layer.

A display device according to one or more embodiments includes: a substrate; a first electrode positioned on the substrate; a hole transport layer positioned on the first electrode; a light emitting layer positioned on the hole transport layer; an electron transport layer positioned on the light emitting layer; and a second electrode positioned on the electron transport layer, wherein the light emitting layer includes a quantum dot, and the electron transport layer includes a hydrophobic ligand.

A display device includes: a pixel circuit layer on a substrate; anodes on the pixel circuit layer and spaced apart from each other; hole injection layers respectively on the anodes; hole transport layers respectively on the hole injection layers; light emitting layers respectively on the hole transport layers; and a common layer on the light emitting layers.