The Prima 1080p HD Pocket Projector is a smartphone-sized projector that lets you view a 200-inch screen in full HD resolution. The thickness is about the same as two smartphones. The output size is available from 30 inches to 200 inches, and the brightness is 200 ANSI lumens. If you grow it to 200 inches, you will have to darken the room, but it is convenient with a built-in battery.
It also comes with a keystone correction function, so there is no need to place it in front of the wall. Moreover, you can also install apps from Google Play by embedding Android. The price is $799. Related information can be found here.