I was wondering the same. I imagine the material structure is tiny, multifaceted particles that reflect a different colour / value at each angle of incidence. I

I was wondering the same. I imagine the material structure is tiny, multifaceted particles that reflect a different colour / value at each angle of incidence. I'm not certain how you'd do that with a realtime display. but if each of those particles had an OLED on each facet it might work. Extraordinarily expensive, mind and even then it's a pretty big if.