The present disclosure provides a pixel isolation wall and its manufacturing method. The pixel isolation wall includes an oleophilic layer arranged on a substrate on which a TFT array and a pixel electrode array is formed, and an oleophobic layer arranged on the oleophilic layer and configured to define, together with the oleophilic layer, a plurality of recess regions corresponding to the pixel electrode array.

A two-dimensional (2D) hybrid perovskite based opto-electric device includes first and second 2D perovskite layers extending along a given plane; an organic layer sandwiched between the first and second 2D perovskite layers, and extending along the given plane; an external organic layer formed on the first 2D perovskite layer and configured to directly face an ambient of the opto-electric device and to extend along the given plane; and electrical pads directly formed over the external organic layer. A roughness of the external organic layer is smaller than 10 nm.

The present invention provides a hole transport material, a preparation method thereof, and an electroluminescent device. Through ingenious molecular design, a xanthracene structure is combined with different electron-donating groups to synthesize a series of hole transport materials with a suitable highest occupied molecular orbital (HOMO) energy level and a suitable lowest unoccupied molecular orbital (LUMO) energy level, and a series of high-performance display devices can be manufactured using the hole transport materials provided by the present invention.

The foldable display panel includes a substrate and a pixel array. The substrate has a surface and display and periphery areas thereon. The periphery area is on at least one side of the display area, and has first and second bonding areas. The first and second bonding areas are at opposite first and second sides of the periphery area, respectively. The first and second bonding areas are spaced apart by a first distance along a first direction. The substrate has a foldable line passing through a center of the display area between the first and the second bonding areas. The first and second sides are on two sides of the foldable line. The pixel array is on the display area and overlaps the foldable line. The pixel array is between the first and second sides and includes sub pixel units arranged in an array.

An organic light emitting diode display includes a substrate including a display area and a pad area, a first thin film transistor disposed on the display area, an organic light emitting diode connected to the first thin film transistor, a pad electrode disposed on the pad area and a pad contact electrode disposed on an upper portion of the pad electrode and electrically connected to the pad electrode. The organic light emitting diode includes an anode, an organic emission layer, and a cathode. The anode includes a lower layer, an intermediate layer, and an upper layer. The pad contact electrode is formed of a material of the lower layer of the anode.

The present invention provides an alkali-free glass sheet, which has a content of Li.sub.2O+Na.sub.2O+K.sub.2O of from 0 mol % to 0.5 mol % in a glass composition, and has a Young's modulus of 78 GPa or more, a strain point of 680° C. or more, and a liquidus temperature of 1,450° C. or less.

A solid-liquid-solid phase transformation (SLSPT) approach is used for fabrication of perovskite periodic nanostructures. The pattern on a mold is replicated by perovskite through phase change of perovskite from initially solid state, then to liquid state, and finally to solid state. The LED comprising perovskite periodic nanostructure shows better performance than that with flat perovskite. Further, the perovskite periodic nanostructure from SLSPT can be applied in many optoelectronic devices, such as solar cells, light emitting diodes (LED), laser diodes, transistors, and photodetectors.

An organic electronic device comprises a substrate, at least one morphological stabilizing layer positioned over the substrate, the morphological stabilizing layer comprising a material having a T.sub.g greater than 50° C., and at least one organic layer positioned in direct contact with the morphological stabilizing layer. A method of making an organic electronic device is also disclosed.

A display apparatus includes: a first substrate and a display unit. The display unit includes a display region and a transmissive region. The display unit further includes: an auxiliary layer disposed in correspondence with the transmissive region; and a second electrode disposed in correspondence with the display region and at least a portion of the transmissive region. The auxiliary layer includes a first material, the second electrode includes a second material, and the first material and the second material each satisfy Equation 1 below: <Equation 1> ST2−ST1>0 mJ/m.sup.2, wherein, in Equation 1, ST1 is a surface energy of the first material at 25° C., and ST2 is a surface energy of the second material at 25° C.

A display device includes a light emitting structure disposed on a substrate, and a thin film encapsulation layer disposed on the light emitting structure and including an inorganic layer containing silicon oxynitride and an organic layer. A portion of the inorganic layer has a stress intensity factor of about 1.6 MPa or more.