An embodiment of the present disclosure provides a display substrate, including: a substrate has a through hole configured to mount a camera therein; and an adhesive layer on a display side of the substrate and provided therein with a first through hole. An aperture size of each of orthographic projections of the first through hole and the through hole on the substrate has a tolerance less than 0.30 mm. An embodiment of the present disclosure further provides a display panel, including: a substrate has a through hole; an adhesive layer on a display side of the substrate and provided therein with a first through hole; an anti-reflection layer on the display side of the substrate and on a side of the adhesive layer proximal to the substrate, and provided therein with a second through hole; and a cover plate on a side of the adhesive layer away from the substrate.

An all-around curved polarizer for an all-around curved display device comprises a polarizing layer, a first protective layer and a second protective layer. The first protective layer is arranged on a side of the polarizing layer adjacent to the all-around curved display device and has a first coefficient of thermal expansion. The second protective layer is disposed on the other side of the polarizing layer opposite to the all-around curved display device, and has a second coefficient of thermal expansion, and the second coefficient of thermal expansion is greater than the first coefficient of thermal expansion of the first protective layer.

A head mount display device, includes: a display panel; and an optical system positioned in front of the display panel. The display panel sequentially includes a light emitting element part, a third retarder, a reflective polarizer, and an absorptive polarizer, where the third retarder is positioned in front of the light emitting element part; and the optical system includes: a first curved lens, which is positioned to face the display panel, and includes a first retarder positioned on a first surface facing the display panel and a beam splitter positioned on a second surface thereof opposite to the first surface; and a second curved lens, which is positioned to face the beam splitter, and includes a second retarder positioned a first surface thereof facing the beam splitter and a second reflective polarizer positioned on a second surface thereof opposite to the first surface of the second curved lens.

An electronic device includes: a base layer; a display element layer on the base layer; and a reflection control layer on the display element layer and comprising a dye, the display element layer comprising: a pixel definition layer having first, second, and third openings formed therethrough; a first light emitting element corresponding to the first opening and emitting a first light; a second light emitting element corresponding to the second opening and emitting a second light different from the first light; a light receiving element corresponding to the third opening; and an inorganic absorbing layer on the first and second light emitting elements, and wherein the reflection control layer overlaps the first light emitting element and the second light emitting element.

A display device includes a display panel, a sensing layer disposed on the display panel and including a fingerprint sensor, an optical layer disposed on the display panel, and a cover layer disposed on the optical layer, wherein the cover layer is a multilayer structure.

Provided is a circularly polarizing plate with which, in a case where a display device obtained by disposing the circularly polarizing plate on a display element is viewed from an oblique direction while the direction thereof is being changed, the display device exhibits little change in tint and has a low reflectivity; and an organic electroluminescent display device. The circularly polarizing plate includes a polarizer and an optically anisotropic layer, in which the optically anisotropic layer is a layer formed by fixing a liquid crystal compound having reverse wavelength dispersibility twist-aligned with a thickness direction as a helical axis, the molecular axis of the liquid crystal compound in the optically anisotropic layer is horizontal to the surface of the optically anisotropic layer, and the twisted angle of the twist-aligned liquid crystal compound is 15° to 360°.

A display panel and a display device are provided. The display panel includes a substrate; an auxiliary metal layer, an anode layer, a pixel definition layer, a light-emitting layer, and a cathode layer, sequentially disposed on a side of the substrate. The pixel definition layer includes barrier wall structures defining openings exposing the anode layer, the light-emitting layer is at least located in openings, the cathode layer includes cathode blocks located in openings, and the auxiliary metal layer includes first metal wiring portions extending along a first direction; and cathode connection lines located among the cathode blocks. Cathode connection lines connect the cathode blocks in openings and, along a direction perpendicular to a plane of the substrate, at least a portion of the cathode connection lines are parallel to multiple first metal wiring portions adjacent to the portion of the cathode connections lines.

A display apparatus includes: a substrate comprising a first area overlapping an optical device and a second area surrounding at least a portion of the first area; a first insulating layer arranged on the substrate; a first pixel electrode and a second pixel electrode arranged apart from each other and disposed on the first area of the first insulating layer; a third pixel electrode and a fourth pixel electrode arranged apart from each other and disposed on the second area of the first insulating layer; and a second insulating layer arranged on the first insulating layer and defining first to fourth openings exposing the first to fourth pixel electrodes, respectively, where the second insulating layer further defines an auxiliary opening exposing a portion of the first insulating layer in the first area, and the auxiliary opening is located between the first opening and the second opening.

An organic light emitting diode which suppresses external light reflection while reducing loss of light generated in an organic light emitting layer is disclosed. An organic light emitting diode includes a substrate, an anode on the substrate, a bank on the anode and exposing a part of the anode to define an emission area, an organic light emitting layer on the emission area and the bank, a cathode on the organic light emitting layer, a plurality of light shielding patterns on the cathode and overlapping the bank, and a light loss inducing layer located on a same plane as the plurality of light shielding patterns and disposed between a pair of light shielding patterns from the plurality of light shielding patterns, the light loss inducing layer having has a same thickness as a thickness of that of the plurality of light shielding patterns, and overlaps the emission area.

A display device includes a first area and a second area adjacent to the first area. A light emitting element may be disposed on the first area, and a pixel circuit connected to the light emitting element may be disposed on the second area. The first area includes a low transmittance area overlapping a cathode of a first pixel and a cathode of a second pixel and a high transmittance area that does not overlap the cathode of the first pixel and the cathode of the second pixel. Each of the cathode of the first pixel and the cathode of the second pixel receives a power voltage having a constant level during a first period and receives a driving signal during a second period.