This is very good for mobile devices and screens where you can turn the display to ensure the best viewing angle, as it increases the light output and increases display efficiency at normal viewing angles.įor applications as diverse as architectural windows for home entertainment, retail advertising and illumination, to navigation/warning displays on windshields and heads-up helmet faceshields, TOLED technology can pave the way. In a top emission OLED, as shown in Figure C, the anode and cathode work together to form an optical cavity, emitting light away from the substrate and the backplane, increasing the aperture ratio of the display. With the same proprietary cathode that is used for transparent OLEDs, TOLED technology can be employed for use in top-emitting OLEDs. TOLEDs, as shown in Figure B, use an optically transparent top cathode, meaning both top and bottom contacts allow light transmission. As a result, when light is generated by the OLED, it emits through the bottom transparent surface. In Figure A below, you see typical OLED, where the bottom contact, or anode, consists of a transparent metal oxide film and the top contact consists of a reflective metal. Universal Display’s TOLED® technology is based on a proprietary top contact, or cathode, that is optically transparent. Transparent OLED (TOLED) technology enables three key features that have the potential to create a host of new product opportunities. In addition, when the device is turned off, the device can be transparent. With the invention and development of a transparent cathode, the light can exit through both sides of the device.
The first OLED devices were constructed with a metallic cathode, so the light generated in the device exited through the glass substrate (i.e. Universal Display Corporation > Organic Light Emitting Diodes (OLEDs) > Transparent OLEDs
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