High-performance OLED microdisplays on CMOS backplanes have been developed using multi-stack white OLED architectures for higher brightness and longer lifetime – the expected benefits from stacked architectures. Unlike OLED lighting, which is bottom emission, the top-emitting OLED on the silicon backplane has a Fabry–Pérot parallel plate microcavity. The combination of the multi-stack approach and the cavity provides additional degrees of design freedom which can be used to optimize the interaction between the OLED formulation and optics of the device. This combination allows reduced power, balanced sub-pixel currents, and increased color gamut. Examples are shown of full color microdisplays made with 3, 4, and 5 stacks that are capable of 5,000 cd/m2 peak luminance with an OLED power consumption for normal video of approximately 150-175mW per square cm of active area. We also show examples of low persistence displays operating at 10% duty cycles with peak luminance of 10,000 cd/m2 and power consumption with normal video of less than 50 mW per square cm of active area. The broad toolkit demonstrated here enables the design optimization of multi-stack OLED microdisplays for many different product requirements spanning AR, VR and other near-eye applications.
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