They throw a very dim image, but I'm surprised it throws any image at all, since the lightsource is completely diffuse.
Why does it still somewhat work?
My theories are:
- The lens is mounted far from the screen, essentially eliminating most non-parallel rays.
- The phone has a screen that is most bright perpendicular to the screen.
- The lens automagically corrects the image? (Does it?)
If I hold one of these large LED lenses in front of my phone;
it throws an image too, so I'm questioning point 1.
That leaves point 2 and 3. If I watch my phone from the side I can still clearly make out the image on screen, so I cannot believe this is such a big factor.
That leaves point 3; every projector out there denounces projection using diffuse sources. I've seen only one instance of a DIY projector using a tight packed LED matrix as light source.
Can anyone explain why these shoebox projectors (somewhat) work?