The Fraunhofer IPMS developed a high-voltage CMOS OLED microdisplay backplane to support multi-stack OLED designs

The Fraunhofer IPMS announced that it has developed an innovative high-voltage CMOS OLED microdisplay backplane that can support exceptionally bright microdisplays. The Fraunhofer IPMS will present a 0.62" SXGA (1280x1024) full-color microdisplay at Displayweek 2025 that will support brightness of up to 10,000 nits. 

The researchers explain that the high-voltage CMOS is needed as tandem-stack (or multi-stack) OLED devices are used to increase brightness. Multi-stack devices increase the voltage drop and swing across the OLED stack, and so require a high-voltage CMOS. The new Fraunhofer IPMS innovative pixel cell design that allow for a voltage swing of over 10 volts. Depending on the number of stacked units, multiples of the maximum emission can be achieved with high current efficiency while maintaining constant current density. This approach enables full color maximum brightness of over 10,000 nits while maintaining lifespan and reliability.

Earlier this year the Fraunhofer IMPS developed an exceptionally bright monochrome (green) 0.62" SXGA 3-stack OLED microdisplay with a brightness of 70,000 nits, and on reference substrates it has even achieved over 200,000 nits.