How do I enlarge an image that's been projected onto a screen?
I made this device that shines light through an LCD screen to project the image onto a window, which then reflects back to me, forming a sort of heads-up display.
The LCD screen is about the size of a credit card, and I can't move it any further than ~40cm from the window.
Another restriction is, any lens I use can't make the device any more than another 5cm thicker. (that includes distance between the lens and the screen)
Is it possible to make the image appear any larger using any lenses? I've tried those plastic magnifying sheets and a lens from a projector tv, but they don't seem to make much difference.