Researchers use electrically-tunable WO3 nanodisks to create 25,000 PPI full-color ePaper displays
Researchers from the Uppsala University and the University of Gothenburg have developed an electronic paper display made from electrically tunable pixels made from small (560 nm in size) WO3 nanodisks. These nanodisks a reversible insulator-to-metal transition on electrochemical reduction. This transition enables dynamic modulation of the refractive index and optical absorption, allowing precise control over reflectance and contrast at the nanoscale.
The display achieves an extremely high resolution - 25,000 PPI, and so the researchers coined these "retinal ePaper displays". The researchers demonstrated full-color video capability (>25 Hz), high reflectance (~80%), strong optical contrast (~50%), low energy consumption (~0.5–1.7 mW cm–2) and support for anaglyph 3D display.