An organic light-emitting diode (OLED) structure includes a stack of OLED layers; a light extraction layer (LEL) comprising a UV-cured ink; and a UV blocking layer between the LEL and the stack of OLED layers.

An organic light-emitting diode (OLED) structure includes a stack of OLED layers that includes a light emission zone having a planar portion, and a light extraction layer formed of a UV-cured ink disposed over the light emission zone of the stack of OLED layers. The light extraction layer has a gradient in index of refraction along an axis normal to the planar portion.

A light emitting transducer including a flexible sheet having a bottom side and a top side, the flexible sheet including a substrate that is stretchable and compressible, the substrate having a bottom substrate surface at the bottom side, and a top substrate surface facing towards the top side, the top substrate surface comprising a surface pattern of a plurality of raised and depressed micro-scale surface portions which extend in at least one direction; a light emitting diode layer above the substrate and conforming in shape to the top substrate surface, the light emitting diode layer corresponding with the surface pattern of the top substrate surface, wherein the light emitting diode layer has a bottom diode surface facing towards the bottom side, and a top diode surface facing towards the top side, a bottom electrode on the bottom diode surface, and a top electrode on the top diode surface.

The present disclosure relates to a thin film transistor substrate having two different types of thin film transistors on the same substrate and a display using the same. A disclosed display device may include a substrate, a first thin film transistor including a first semiconductor layer having a polycrystalline semiconductor material on the substrate, and a second thin film transistor including a second semiconductor layer including an oxide semiconductor material on the substrate. Both the first semiconductor layer and the second semiconductor layer may be disposed directly on a same underlying layer.

Display apparatuses according to various embodiments are provided. A display apparatus according to an embodiment includes a substrate, a thin film transistor on the substrate, an organic insulating layer on the thin film transistor, a pixel electrode arranged on the organic insulating layer, wherein a central region, a peripheral region surrounding the central region, and a connection region adjacent to the peripheral region are defined on the pixel electrode, and the pixel electrode includes a protrusion arranged in the peripheral region and protruding toward the substrate and a via plug arranged in the connection region and electrically connected to the thin film transistor, and a pixel definition layer exposing the central region of the pixel electrode.

A device may include a photosensitive transistor and a light-emitting diode. The light-emitting diode may include an anode. The anode may include a first portion having a first thickness and a second portion having a second thickness, wherein the second thickness is less than the first thickness. The device may also include driving circuitry that receives a data signal and causes light to emit from the light-emitting diode in response to the data signal. The photosensitive transistor may generate an electrical signal in response to light emitted from the light-emitting diode during the light emission.

An organic light emitting display device includes an overcoating layer on a substrate; a first electrode on the overcoating layer; a bank layer on the overcoating layer and the first electrode, the bank layer including an opening through which the first electrode is exposed; a pattern layer having an island shape on the exposed portion of the first electrode; an organic emission layer on the first electrode and the pattern layer; and a second electrode on the organic emission layer.

An organic light-emitting diode (OLED) structure including a substrate; a dielectric layer on the substrate having an array of well structures, wherein each well structure includes a recess with side walls and a floor, and the well structures are separated by plateaus; a stack of OLED layers covering at least the floor of the well; a light extraction layer (LEL) in the well over the stack of OLED layers; and a coating covering a portion of the stack of OLED layers such that a top surface of the plateaus is more hydrophobic than a surface in the well on which the light extraction layer is formed.

An organic light-emitting display apparatus includes a red pixel, a green pixel, and a blue pixel, each including: a first insulating layer on a substrate; a connection electrode on the first insulating layer; a second insulating layer on the first insulating layer; an organic light-emitting diode on the second insulating layer, the organic light-emitting diode including a pixel electrode, an intermediate layer including an organic emission layer, and an opposite electrode; a pixel defining layer covering an edge of the pixel electrode and including an opening exposing the pixel electrode, the opening defining an emission area; and a via hole defined in the second insulating layer and through which the pixel electrode is connected to the connection electrode, and a spacing distance between the emission area and the via hole is different in each of the red pixel, the green pixel, and the blue pixel.

Disclosed is a light emitting display device that can enhance light extraction efficiency of light which is emitted from a light emitting element. The light emitting display device includes: an uneven portion that is provided on a substrate and includes a plurality of concave portions separated from each other and protruding portions between the plurality of concave portions; and a light emitting element that is provided on the uneven portion. Each protruding portion includes a vertex portion that is provided between three neighboring concave portions and a connection portion that is connected to two neighboring vertex portions between two neighboring concave portions and has a height less than that of the vertex portions.