Emissive OLED-on-silicon microdisplays have been considered being opaque only so far. However, modern and advanced silicon CMOS process nodes are increasingly made on silicon-on-insulator (SOI) substrates. By separating the SOI handle wafer from the buried oxide (BOX) layer (that has the active silicon on top) and applying space-cautious layout design of the CMOS active devices as well as wiring layers it is possible to achieve semitransparent, high-resolution CMOS backplanes for microdisplays. Similar to regular OLED-on-silicon the emissive frontplane becomes embedded by waferlevel OLED post-processing. Yet, depending on pixel density and array layout a microdisplay transparency of <20% can be achieved now. Consequently, the semi-transparent microdisplay becomes the optical combiner itself, eliminating the exit pupil expander (EPE), which drastically improves the optical efficiency from the light source into the eye box. Additionally, new high-brightness OLED achieving <35kcd/m² in monochrome, or 10kcd/m² in color versions, and their integration onto the OLED-on-SOI platform and an ultra-low power pixel cell backplane architecture (power consumption <10mW) pave the way for matching both form factor and battery life requirements in optical see-through NTE, enabling new optical concepts for augmented-reality (AR) devices.
OLED-on-Silicon technology has reached industry maturity for OLED (organic light emitting diode) microdisplays, e.g., in near-to-eye applications. Anyway, there is a huge amount of further applications, which can be addressed with an organic frontplane on an integrated CMOS backplane, e.g., OPD (organic photo diode). This paper will report on latest results in the field of OPD-on-silicon sensing as well as OLED-on-silicon displays, sketching up the impact of a universal photonic platform comprising emitters, photodetectors and CMOS driving and read-out circuitry, based on application scenarios.
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