<p>➀ A Swedish research team developed a reflective micro-display with 25,000 pixels per inch (25,000 dpi), the smallest pixels to date, using metamaterial nano-structures and a three-level geometric hierarchy to achieve cyan, magenta, and yellow sub-pixels;</p><p>➁ The display uses tungsten trioxide nano-discs and lithium-ion electrolyte switching (±4V) for color control, enabling 40ms response time, though it currently lacks per-pixel addressing;</p><p>➂ The proof-of-concept demonstrated a 1.9mm-tall reproduction of Gustav Klimt's "The Kiss" using 560nm-sized pixels, showcasing human-eye-level resolution potential for future VR/AR or ultra-compact displays.</p>