The present disclosure provides an organic light emitting diode (OLED) display panel and a display panel which include a display region, a binding region, and a bending region. A metal trace inside the bending regions generates a tensile stress region and a compressive stress region. A plurality of through holes are disposed on the metal trace. A distribution density of the through holes corresponding to the tensile stress region is different from distribution density of the through holes corresponding to the compressive stress region. It may relieve the stress, reduce the problems such as failure and bad products, reduce the bending angle to be smaller, and achieve narrower borders.

A window panel includes: a substrate having a thickness of less than 100 μm and including a first surface and a second surface facing each other in a thickness direction; first ions dispersed in the substrate and each having a first ion radius; and second ions dispersed in the substrate and each having a second ion radius which is greater than the first ion radius, wherein the second ions generate a compressive stress, the compressive stress is reduced with depth from the first surface or the second surface within a range from the first surface or the second surface to a ½ point of the thickness.

An object of one embodiment of the present invention is to provide a multicolor light-emitting element that utilizes fluorescence and phosphorescence and is advantageous for practical application. The light-emitting element has a stacked-layer structure of a first light-emitting layer containing a host material and a fluorescent substance, a separation layer containing a substance having a hole-transport property and a substance having an electron-transport property, and a second light-emitting layer containing two kinds of organic compounds that form an exciplex and a substance that can convert triplet excitation energy into luminescence. Note that a light-emitting element in which light emitted from the first light-emitting layer has an emission spectrum peak on the shorter wavelength side than an emission spectrum peak of the second light-emitting layer is more effective.

A flexible display panel, a manufacturing method for the flexible display panel, and a display device are provided. The flexible display panel includes a packaging layer, a driving circuit layer and an insulation layer. The insulation layer serves as a base of the flexible display panel and is located at a side of the driving circuit layer distal to the packaging layer, each of a CTE and a light transmittance of the insulation layer is within a respective predetermined range, the CTE of the insulation layer is smaller than a first threshold, the light transmittance of the insulation layer is greater than a second threshold, the first threshold is within a range of 5 to 15, and the second threshold is within a range of 90% to 99%.

A light-emitting device includes a plurality of organic EL elements. Each of the organic EL elements includes a reflection electrode, a hole transport region, an electron-trapping luminescent layer, and a light extraction electrode in this order. The hole transport region has a sheet resistance of 4.0×10.sup.7 Ω/sq.⋅ or more at a current of 0.1 nA/pixel, and the total thickness of the hole transport region and the electron-trapping luminescent layer is equivalent to an optical path length enabling emission from the electron-trapping luminescent layer to be enhanced.

The present disclosure provides an OLED display panel and a method for detecting the OLED display panel, and a display device. The OLED display panel includes a base substrate including a display area and a non-display area surrounding the display area and having a first region adjacent to the display area. The display area includes a drive signal line and a power supply voltage signal line both extending from the display area to the first region. The drive signal line includes, in the first region, a first section of wiring at an anode layer, the power supply voltage signal line includes, in the first region, a second section of wiring at a gate metal layer, and parts of the drive signal line and the power supply voltage signal line in the display area are located at a source-drain metal layer.

A flexible display device includes a first non-bending area, a second non-bending area spaced apart from the first non-bending area, and a bending area between the first non-bending area and the second non-bending area; and a protective member on a surface of the flexible display panel, and including a first protective member overlapping the first non-bending area and a second protective member overlapping the second non-bending area, each of the first protective member and the second protective member including an inclined surface inclined with respect to the surface of the flexible display panel overlapping the flat area adjacent to the bending area, and the inclined surfaces do not physically contact each other in a bending state.

The present disclosure relates to a method of fabricating a display panel. The method may include: forming a separation layer having first openings on a surface of the substrate; forming a flexible substrate layer covering the separation layer and the first openings; forming a TFT layer having second openings on a surface of the flexible substrate layer opposite from the substrate; removing a part of the flexible substrate layer that is underneath the second openings; forming a PDL layer covering the TFT layer, side walls of the third openings, and a part of the separation layer in the third openings, thereby forming fourth openings having a fourth width larger than the first width; forming an encapsulation layer covering the PDL layer and the fourth openings; and separating the flexible substrate layer from the substrate.

A light-emitting device includes: a first electrode; a second electrode facing the first electrode; and an interlayer disposed between the first electrode and the second electrode and including an emission layer; wherein the interlayer further includes: a layer A including an oxide of an inorganic compound; a layer B adjacent to an upper portion of the layer A and including an oxide of an inorganic compound; and a layer C adjacent to a lower portion of the layer A and including an oxide of an inorganic compound, and relationships between a refractive index a of the layer A, a refractive index b of the layer B, and a refractive index c of the layer C satisfy the Equations (1) and (2) defined herein.

A light-emitting device includes a first electrode, a second electrode facing the first electrode, a light-emitting layer provided between the first electrode the second electrode and including a phosphor, a layered body including a metal layer, a first insulating layer provided on a second electrode side of the metal layer, and a second insulating layer provided on a light-emitting layer side of the metal layer, and having a thickness that allows electron injection from the second electrode to the light-emitting layer, a first power supply configured to apply a voltage between the first electrode and the second electrode, and a second power supply configured to apply, between the metal layer and the second electrode, a voltage of which polarity of the second polarity is opposite to a polarity of the second electrode of a voltage applied by the first power supply between the first electrode and the second electrode.