Abstract: Systems and methods for improving the brightness of a transparent display are disclosed herein. One embodiment collects ambient light using an array of Fresnel lenses disposed on an external surface of a vehicle; collects internal light from the vehicle's headlights; filters the ambient light and the internal light to produce filtered ambient light and filtered internal light; generates primary-source light using a light-emitting-diode (LED) light source; and injects, into a transparent edge-lit liquid crystal waveguide display deployed in at least a portion of a window of the vehicle, the primary-source light, the filtered ambient light, and the filtered internal light in a color-synchronized manner. The filtered ambient light and the filtered internal light improve the brightness of the transparent edge-lit liquid crystal waveguide display.

Abstract: Systems and methods for improving the brightness of a transparent display are disclosed herein. One embodiment collects ambient light using an array of metasurface lenses disposed on an external surface of a vehicle; collects internal light from the vehicle's headlights; filters the ambient light and the internal light to produce filtered ambient light and filtered internal light; generates primary-source light using a light-emitting-diode (LED) light source; and injects, into a transparent edge-lit liquid crystal waveguide display deployed in at least a portion of a window of the vehicle, the primary-source light, the filtered ambient light, and the filtered internal light in a color-synchronized manner. The filtered ambient light and the filtered internal light improve the brightness of the transparent edge-lit liquid crystal waveguide display.

Abstract: Systems and methods for improving the brightness of a transparent display are disclosed herein. One embodiment collects ambient light using an array of diffraction gratings disposed on an external surface of a vehicle to produce filtered ambient light; collects internal light from the vehicle's headlights; filters the internal light to produce filtered internal light; generates primary-source light using a light-emitting-diode (LED) light source; and injects, into a transparent edge-lit liquid crystal waveguide display deployed in at least a portion of a window of the vehicle, the primary-source light, the filtered ambient light, and the filtered internal light in a color-synchronized manner. The filtered ambient light and the filtered internal light improve the brightness of the transparent edge-lit liquid crystal waveguide display.

Abstract: This invention has an objective to improve durability at elevated temperature in organic electroluminescent devices using coumarin derivatives as dopant in a luminescent layer. This invention attains the above objective by providing in the organic electroluminescent devices formed by laminating an anode, a hole injection layer, a hole transportation layer, a luminescent layer, an electron transportation layer and a cathode in this order, the luminescent layer which comprises as dopant the green light-emitting coumarin derivative and hole- and electron-transporting substances as host; said coumarin derivative consisting of a plurality of coumarin groups bound to an aromatic ring, heterocycle, or any combination thereof, and exhibiting a glass transition point of 150° C. or higher or a melting point of 297° C. or higher.

Abstract: An organic EL element is formed having a crystalline CuPc film as a positive hole injection layer and a positive hole transport layer, a luminescent layer, an electron transport layer and an electron injection layer, composed of amorphous organic materials, laminated between a pair of electrodes, wherein the change in the diffraction peak value of the CuPc film appearing with X-ray diffraction, which is produced by heating in the utilization temperature range of the organic EL element, is within ±25% of the diffraction peak value before heating. The organic EL element comprising a crystalline organic material is resistant to current shorts and leaks and exhibits satisfactory luminance properties in the utilization temperature range.

Abstract: This invention has an objective to improve durability at elevated temperature in organic electroluminescent devices using coumarin derivatives as dopant in a luminescent layer. This invention attains the above objective by providing in the organic electroluminescent devices formed by laminating an anode, a hole injection layer, a hole transportation layer, a luminescent layer, an electron transportation layer and a cathode in this order, the luminescent layer which comprises as dopant the green light-emitting coumarin derivative and hole- and electron-transporting substances as host; said coumarin derivative consisting of a plurality of coumarin groups bound to an aromatic ring, heterocycle, or any combination thereof, and exhibiting a glass transition point of 150° C. or higher or a melting point of 297° C. or higher.

Abstract: An organic EL element is formed having a crystalline CuPc film as a positive hole injection layer and a positive hole transport layer, a luminescent layer, an electron transport layer and an electron injection layer, composed of amorphous organic materials, laminated between a pair of electrodes, wherein the change in the diffraction peak value of the CuPc film appearing with X-ray diffraction, which is produced by heating in the utilization temperature range of the organic EL element, is within ±25% of the diffraction peak value before heating. The organic EL element comprising a crystalline organic material is resistant to current shorts and leaks and exhibits satisfactory luminance properties in the utilization temperature range.

Abstract: An organic electro luminescence display panel includes a hole transport layer and a luminescent layer disposed on the hole transport layer. The luminescent layer includes at least first and second luminescent layers. The first and second luminescent layers are repeatedly arranged on the hole transport layer so as to be adjacent each other. The first luminescent layer includes a first dopant for emitting a first light having a first wavelength, and the second luminescent layer includes a second dopant for emitting a second light having a second wavelength, which is shorter than the first wavelength. No first dopant is disposed between the hole transport layer and the second luminescent layer.

Abstract: An organic EL element is formed having a crystalline CuPc film as a positive hole injection layer and a positive hole transport layer, a luminescent layer, an electron transport layer and an electron injection layer, composed of amorphous organic materials, laminated between a pair of electrodes, wherein the change in the diffraction peak value of the CuPc film appearing with X-ray diffraction, which is produced by heating in the utilization temperature range of the organic EL element, is within ±25% of the diffraction peak value before heating. The organic EL element comprising a crystalline organic material is resistant to current shorts and leaks and exhibits satisfactory luminance properties in the utilization temperature range.