A compound useful as a host material in phosphorescent light emitting devices is disclosed. The compound has the following formula: ##STR00001##
in which R represents an adjacent di-substitution having the following formula fused to ring A: ##STR00002##

Disclosed herein is a display panel in which a plurality of pixel regions are arranged in a matrix form, the display panel including a substrate, a plurality of pixel electrodes, a partition wall, a first functional layer, a first light emitting layer, a second functional layer, and a second light emitting layer. As viewed in plan, a ratio of an area of the first functional layer to an area of the pixel region in which the first functional layer is present being lower than a ratio of an area of the second functional layer to an area of the pixel region in which the second functional layer is present.

A display panel includes a first display area including first light emitting areas and a second display area adjacent to the first display area and including second light emitting areas and a signal transmission area; a base substrate; a circuit element layer disposed on the base substrate; a light blocking pattern disposed between the base substrate and the circuit element layer, overlapping the first and second light emitting areas, and having a first opening corresponding to the signal transmission area; and a light emitting element layer disposed on the circuit element layer and including a first electrode overlapping the first and second light emitting areas, a light emitting layer disposed on the first electrode, and a second electrode overlapping the first and second light emitting areas. The signal transmission area has a second transmittance that is higher than a first transmittance of the second light emitting areas.

This invention discloses methods to form a micro thin film device. The methods use release layer on a substrate, encapsulation layers, electrode formation, and forming a bank layer. The methods further use VIA's to provide access to pads. The methods also entail transfer of multiple micro thin film devices by forming micro thin film devices on a cartridge, forming a housing, using anchors, and covering a side wall of the housing with a release layer.

This invention relates to the development of heterocyclic materials for use as blue phosphorescent materials in OLED devices. The materials are based on a pair of 5-membered aromatic or psuedoaromatic rings bonded to one another and complexed to a transition metal. The materials were determined computationally to have appropriate triplet energies for use as blue emitters and to possess sufficient chemical stability for use in devices.

Polymers including a repeating unit of the following formula I are disclosed. A repeating structural unit E is selected from a structural unit of the following formula (1) or (2). Mixtures and formulations containing the polymers are also disclosed.

Polymers including a repeating unit of the following formula I are disclosed. A repeating structural unit E is selected from a structural unit of the following formula (1) or (2). Mixtures and formulations containing the polymers are also disclosed.

A compound is disclosed that includes a ligand L.sub.A of Formula I ##STR00001##
where ring C is a 5-membered or a 6-membered carbocyclic or heterocyclic ring; each R.sup.A, R.sup.B, and R.sup.C independently represents mono to the maximum allowable number of substitutions, or no substitution; L.sub.A is complexed to a metal M; M is optionally coordinated to other ligands; the ligand L.sub.A is optionally linked with other ligands to comprise a tridentate, tetradentate, pentadentate, or hexadentate ligand; and any two substituents of R.sup.B and R.sup.C may be joined or fused together to form a ring.

The present disclosure provides a light emitting device including: a first electrode; a first light emitting layer on a side of the first electrode; an N-type charge generation layer on a side of the first light emitting layer distal to the first electrode; a P-type charge generation layer on a side of the N-type charge generation layer distal to the first light emitting layer; a second light emitting layer on a side of the P-type charge generation layer distal to the N-type charge generation layer; and a second electrode on a side of the second light emitting layer distal to the P-type charge generation layer. The N-type charge generation layer includes a host material which has a lowest unoccupied molecular orbital energy level less than or equal to −2.9 and a glass transition temperature greater than 130° C.

A display device includes an electronic panel, a window, an optical sheet, and a stress control member. The electronic panel includes a first non-bending area having a first area overlapping the optical sheet and a second area overlapping at least part of the recessed area, a bending area configured to be bent relative to the first non-bending area, and a second non-bending area extending from the bending area and movable to a position opposing the first non-bending area. The optical sheet is disposed between the electronic panel and the window and having a recessed area defined therein extending toward a center of the optical sheet. The stress control member overlaps with at least a portion of the second area, at least a portion of the bending area, and at least a portion of the second non-bending area, respectively.