Tiny Projectors Being Developed, Coming To Market
The minimum distance on the projector is 50cm, which gives you the equivalent 15 inch display. You can adjust the size of the display being projected by simply moving the projector farther away from the screen. A device this small will have a limited resolution of course, the tiny projector will only display at 640×480.
This isn’t something that you’re going to see at a retail store unfortunately, but you may start seeing it in various personal electronics.