A decade ago, the #OLPC had a screen that could work in 2 modes: normal LCD with colour, and low-power sun-readable monochrome. The techno was by #PixelQi. That company tanked but apparently https://www.tripuso.com/index.html is still selling 7 inches screens with the techno. Anyone bought some from them? Do you know of any other tech that is similar (fast color & e-ink-like monochrome)?