> having 101 screens attached to your keyboard is pretty costly I wonder if it would be somehow feasible to cut costs by using a projection scheme. Perhaps ea

> having 101 screens attached to your keyboard is pretty costly I wonder if it would be somehow feasible to cut costs by using a projection scheme. Perhaps each key could be essentially passive rear projector screen, then you'd have a system of mirrors, lenses, prisms, or whatever below the keys so that one DLP or other projection system could hit all the keys. Maybe having 1 active component and 101 passive components (hopefully all plastic) would make the whole thing a lot cheaper. Of course, there would be the small matter of building it so the geometry works out where you can have the image hit the key and also have a switch and spring beneath it.