4K displays are tack-sharp, plentiful, and getting cheaper. But UltraHD screens will never be as cool as this low-res 0.02K display for a simple reason: Instead of using OLED or LED, this screen creates images using motorized belts of multicolored fabric.
http://www.wired.com/2015/07/forget-4k-low-res-screen-creates-images-thread/