In a watch or other display device, the functionality of the device can be enhanced by using a display that pairs a transparent organic light-emitting diode (TOLED) layer with an underlying display, with the TOLED layer being placed on top of the underlying display instead of below it. There are two main embodiments: (a) one in which the display is a liquid crystal display (LCD) or other transparent display paired with a TOLED layer, and (b) one in which an electrophoretic display such as E-Ink or E-paper is paired with a TOLED layer. Additional layers can, of course, be added in other embodiments.
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Faraji, Kiavash; Basehore, Derek; and Sanders, Nick, "Display Device for Wearable and Other Products", Technical Disclosure Commons, (April 07, 2017)