Abstract
High energy consumption and lack of readability under bright sunlight of conventional transmissive display technology greatly limit the user experience of mobile and wearable devices. To solve this issue, a hybrid display by overlaying a full‐color reflective display on top of a transmissive display is invented. The key component of this technology is a full‐color reflective display based on tandem switchable all‐dielectric metasurfaces. The switchable all‐dielectric metasurfaces in large size(average area ≈5 cm2)are invented and fabricated by low‐cost and high‐throughput nanoimprint lithography. Each switchable metasurface is formed by an array of TiO2/SiO2 hybrid nanopillars on top of a SiO2substrate, which could reflect a unique color(blue, green, or red)light with high efficiency(bandwidth ≈100 nm and reflectance ≈80%). They become highly transparent(switched‐off)upon high‐index liquid injection. These metasurfaces demonstrate great characteristics such as polarization independence, large viewing angle(up to 60°), and ultra‐high resolution(over 6000 pixels per inch). This kind of full‐color reflective display can be combined with traditional transmissive display to achieve a low‐power hybrid display that performs well from totally dark to bright sunlight conditions. That resolves one of the biggest challenges in mobile and wearable device industry.