Patent number 8633497 is assigned to The Regents of the
The following quote was obtained by the news editors from the background information supplied by the inventors: "
"OLEDs make use of thin organic films that emit light when voltage is applied across the device. OLEDs are becoming an increasingly interesting technology for use in applications such as flat panel displays, illumination, and backlighting. Several OLED materials and configurations are described in U.S. Pat. Nos. 5,844,363, 6,303,238, and 5,707,745, which are incorporated herein by reference in their entirety.
"More details on OLEDs, and the definitions described above, can be found in U.S. Pat. No. 7,279,704, which is incorporated herein by reference in its entirety."
In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventors' summary information for this patent: "A first device is provided. The first device includes an organic light emitting device, which further comprises a first electrode, a second electrode, and an organic emissive layer disposed between the first and second electrode. Preferably, the second electrode is more transparent than the first electrode. The organic emissive layer has a first portion shaped to form an indentation in the direction of the first electrode, and a second portion shaped to form a protrusion in the direction of the second electrode. The indentation may be concave. The first device may include a plurality of organic light emitting devices.
"The organic light emitting device may be disposed over a substrate, such that the first electrode is disposed over the substrate, and the second electrode is disposed over the first electrode. The second electrode may be an anode and is preferably conformal to the organic emissive layer. The first electrode may be a cathode and is preferably reflective.
"Preferably, the distance between the first and second electrodes has an optical path length of about one half of the peak wavelength of light emitted by the organic emissive layer.
"The device may further comprise an outcoupling enhancement layer disposed over the second electrode.
"The first device may have protrusion that are formed at a boundary between two adjoining indentations.
"The first device may also have protrusions that are formed at a boundary between an indentation and a surface parallel to the substrate.
"The organic emissive layer may have a shape that includes a plurality of indentations in the direction of the first electrode. The indentation may be shaped to form a partial sphere. Preferably, the partial sphere has a radius of curvature between 1 .mu.m and 1 cm. The indentation may also be shaped to form a partial cylinder. The indentation may also be shaped form a rotationally symmetric aspheric surface. Preferably, the rotationally symmetric aspheric surface has a radius of curvature that is between 1 .mu.m and 1 cm at all points on the surface. The indentation may also be shaped to form an inverted pyramid with or without a mesa. Preferably, every point on the surface of the indentation is within 10 attenuation lengths of an edge of the indentation, measured by traveling along the surface of the indentation.
"Preferably, of the light emitted by the organic emissive layer, at least 5% is waveguide outcoupled and at least 20% is directly outcoupled, and more preferably, at least 25% is directly outcoupled.
"The first device may be a consumer device.
"The first device may further comprise an active matrix backplane."
URL and more information on this patent, see: Forrest, Stephen R.; Slootsky, Michael; Lunt, Richard. Concave-Hemisphere-Patterned Organic Top-Light Emitting Device. U.S. Patent Number 8633497, filed
Keywords for this news article include: The Regents of the
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