The present disclosure provides a display panel and a mask. The display panel does not dispose a common electrode layer in a transparent area and an aisle area, and by this way, after the transparent area of the display panel is cut to form a through-hole, the common electrode layer can still be protected by other film layers and not be directly exposed to air, thereby preventing intrusion of water and oxygen.

A mask assembly includes a frame including long side portions extending in a first direction and spaced apart from each other in a second direction intersecting the first direction, and short side portions connected to the long side portions, the frame defining a frame opening, a first stick extending in the second direction and connected to the frame, a first mask sheet defining first deposition openings and connected to the first stick and the frame, at least part of the first deposition openings arranged in the first direction and overlapping the frame opening in a plan view, and a second mask sheet defining second deposition openings and connected to the first stick and the frame, at least part of the second mask sheet arranged in the first direction and overlapping the frame opening in a plan view.

A metal mask substrate includes a metal obverse surface configured such that a resist is placed on the obverse surface. The obverse surface has a three-dimensional surface roughness Sa of less than or equal to 0.11 μm. The obverse surface also has a three-dimensional surface roughness Sz of less than or equal to 3.17 μm.

An opto-electronic device includes: a first electrode; an organic layer disposed over the first electrode; a nucleation promoting coating disposed over the organic layer; a nucleation inhibiting coating covering a first region of the opto-electronic device; and a conductive coating covering a second region of the opto-electronic device.

The present specification relates to an organic light emitting device comprising a first electrode, a second electrode, and an organic material layer comprising one or more layers provided between the first electrode and the second electrode, wherein the one or more layers of the organic material layer comprise a heterocyclic compound represented by Chemical Formula 1 and a heterocyclic compound represented by Chemical Formula 2, a composition for the organic material layer of the organic light emitting device, and a method for manufacturing the organic light emitting device.

A pixel arrangement structure includes: first sub-pixels, second sub-pixels and third sub-pixels, all being not overlapped but being spaced apart. The third sub-pixels have a first symmetry axis and a second symmetry axis that are perpendicular to each other. The first symmetry axis extends through a geometric center of a respective first sub-pixel adjacent to a respective third sub-pixel of the plurality of third sub-pixels, intersects a first edge of the respective third sub-pixel at a first intersection point, and intersects a second edge of the adjacent respective first sub-pixel at a second intersection point. A distance between the first intersection point and the second intersection point is a minimum distance between the respective third sub-pixel and the respective first sub-pixel. The second symmetry axis is similarly configured with respect to a respective second sub-pixel and the respective third sub-pixel.

An organic electroluminescent device is disclosed. The organic electroluminescent device achieves low driving voltage and high luminous efficiency as well as long lifespan by including an exciton confinement layer (ECL), in which a predetermined physical property is adjusted, in an area of an electron transporting area, including at least two layers, that is adjacent to an emissive layer.

One or more embodiments include a display apparatus including an opening, an apparatus for manufacturing the display apparatus, and a method of manufacturing the display apparatus capable of reducing generation of gas or foreign matter.

According to one embodiment, a deposition method includes preparing a processing substrate in which a lower electrode, a rib, and a partition including a lower portion and an upper portion arranged on the lower portion and protruding from a side surface of the lower portion are formed above a substrate, setting a spread angle of vapor of a first material emitted from a first deposition head to a first angle, and depositing the first material on the processing substrate, and setting a spread angle of vapor of a second material emitted from a second deposition head to a second angle larger than the first angle, and depositing the second material on the processing substrate on which the first material is deposited.

According to one embodiment, a deposition method includes preparing a processing substrate in which a lower electrode, a rib, and a partition including a lower portion and an upper portion arranged on the lower portion and protruding from a side surface of the lower portion are formed above a substrate, setting a spread angle of vapor of a first material emitted from a first deposition head to a first angle, and depositing the first material on the processing substrate, and setting a spread angle of vapor of a second material emitted from a second deposition head to a second angle larger than the first angle, and depositing the second material on the processing substrate on which the first material is deposited.