Hamer, JohnJohnHamerSpindler, JeffreyJeffreySpindlerKondakova, MarinaMarinaKondakovaRichter, BerndBerndRichterWartenberg, PhilippPhilippWartenbergBunk, GerdGerdBunkVogel, UweUweVogel2024-06-282024-06-282022-05-01https://publica.fraunhofer.de/handle/publica/470563A microdisplay comprising a light emitting OLED stack on top of a silicon-based backplane with individually addressable pixels and control circuitry wherein the light emitting OLED stack has three or more OLED units between a top electrode and a bottom electrode; and the control circuitry of the silicon-based backplane comprises at least two transistors with their channels connected in series between an external power source V DD, and the bottom electrode of the OLED stack. The light-emitting OLED stack preferably has a Vth of at least 7.5 V or more. The control circuit can include a protection circuit comprised of a p-n diode, preferably a bipolar junction transistor.enpatentTW202217785 ATW20210124008