Philips has created a totally transparent OLED display that essentially becomes opaque when it’s powered. I don’t think I need to tell you the implications of a material which can have its transparency level changed dynamically like this. In the home, in the workplace, just about everywhere could use something like this. Imagine replacing your windows with these, or having a layer over your mirror which you can control by touch. Other solutions are out there, but this one appears to be more transparent than those.
Of course, the uses all depend on various aspects of the displays: how fast is it to dim or light up? How small can you make it? How large? In what shape? And so on. Still, it’s a great technology and hopefully we’ll be seeing it in action soon.