A display device includes a substrate, a pixel circuit layer above the substrate, a first anode, a second anode, and a third anode spaced apart above the pixel circuit layer, a pixel-defining layer above the pixel circuit layer, and overlapping portions of the first anode, the second anode, and the third anode, a first emission structure, a second emission structure, and a third emission structure respectively above the first anode, the second anode, and the third anode, and respectively including curved edges, and a common layer above the first emission structure, the second emission structure, the third emission structure, and the pixel-defining layer.

A display device includes a first pixel, a second pixel, and a third pixel respectively including first, second, and third light-emitting elements configured to emit red light, green light, and blue light, respectively. Each of the first light-emitting element, the second light-emitting element, and the third light-emitting element includes a pixel electrode, an electron-blocking layer over the pixel electrode, an emission layer over the electron-blocking layer, a hole-blocking layer over the emission layer, and a counter electrode over the hole-blocking layer. The third light-emitting element further includes a first buffer layer between the emission layer and the hole-blocking layer. The emission layers of the first light-emitting element and the second light-emitting element include a thermally activated delayed-fluorescence material. The emission layer of the third light-emitting element includes a first fluorescence material having a fluorescence lifetime equal to or longer than 1 ps and shorter than 1 ns.

Alight emitting device comprises a first light emitting element and a second light emitting element; and a first microlens and a second microlens arranged so as to correspond to the first light emitting element and the second light emitting element, respectively. The first light emitting element includes a first light emitting layer, the second light emitting element includes a second light emitting layer. Assuming that an area of a region where light entered and passed through the first microlens is defined as S.sub.1, an area of the light emission region of the first light emitting layer is defined as S.sub.1, an area of a region where light entered and passed through the second microlens is defined as S.sub.2, and an area of the light emission region of the second light emitting layer is defined as S.sub.2, a relationship expressed by

|S.sub.1-S.sub.1|<|S.sub.2-S.sub.2|

is satisfied.

A display device includes a first pixel electrode, a second pixel electrode, an insulating layer including a first opening part exposing a part of an upper surface of the first pixel electrode, and a second opening part exposing a part of an upper surface of the second pixel electrode, a first common layer arranged above the first pixel electrode, the second pixel electrode and the insulating layer, a first light-emitting layer a second light-emitting layer arranged above the first common layer; an opposite electrode arranged above the first light-emitting layer and the second light-emitting layer, a carrier absorption layer arranged above the insulating layer, the carrier absorption layer being arranged between the first common layer and the second light-emitting layer, and a light emission start voltage of the second light-emitting layer is lower than a light emission start voltage of the first light-emitting layer.

A display device includes an insulating layer including a protrusion which is disposed between a first pixel and a second pixel that are next (adjacent) to each other and protrudes along a height direction; a first pixel electrode disposed in the first pixel and a second pixel electrode disposed in the second pixel on the insulating layer; and a common electrode disposed on the first pixel electrode and the second pixel electrode and connected across the first pixel and the second pixel. The common electrode defines an opening between the first pixel and the second pixel, and the opening of the common electrode may surround a sidewall of the protrusion.

A display device includes a substrate, first electrodes disposed on the substrate, a pixel defining film covering edges of the first electrodes, a spacer disposed on the pixel defining film and disposed between the first electrodes, an organic layer disposed on the first electrodes, the pixel defining film, and the spacer; and a second electrode disposed on the organic layer. The organic layer includes a first common layer and a second common layer continuously disposed on the first electrodes, and the first common layer, the second common layer, and the second electrode do not overlap the spacer.

A display device includes light-emitting areas respectively emitting red light, green light and blue light, a non-light emitting area which is between the light-emitting areas. and in each of the light-emitting areas a hole transport layer, a light-emitting layer on the hole transport layer, an electron transport layer on the light-emitting layer, an electron injection layer which is on the electron transport layer and has a thickness, and among the light-emitting areas, the thickness of the electron injection layer in the light-emitting area which emits the red light being greater than the thickness of the electron injection layer in the light-emitting area which emits the green light and being greater than the thickness of the electron injection layer in the light-emitting area which emits the blue light.

A display device manufacturing method of manufacturing a display device including a plurality of light-emitting elements in each of which an anode, a hole injection layer, a light-emitting layer, and a cathode are layered in this order, the hole injection layer being provided in common in the plurality of light-emitting elements, and the method including treating the hole injection layer with a treatment liquid to change conductivity of at least a portion of the hole injection layer.

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 pixel array structure and a display panel are provided. The pixel array structure includes a plurality of pixel units, each of the plurality of pixel units being disposed within a virtual square. Each of the plurality of pixel units includes: a first sub-pixel, having a polygon structure and a first outer boundary, where a geometric center of the first sub-pixel coincides with the pixel center; a second sub-pixel, having an annular structure surrounding the first sub-pixel, and having a second outer boundary and a second inner boundary, where the second inner boundary and the first outer boundary are similar polygon structures arranged concentrically and having the same number of sides; and multiple third sub-pixels, sandwiched between an edge of the virtual square and the second outer boundary, where the multiple third sub-pixels are disposed at multiple vertices of the virtual square in one-to-one correspondence.