There's also multi-planar rear-projection screens by Lightspace[1], they essentially have a stack of liquid crystal diffusers (20 or so) that can switch between

There's also multi-planar rear-projection screens by Lightspace[1], they essentially have a stack of liquid crystal diffusers (20 or so) that can switch between transparent or diffusing state. [1]http://lightspace3d.com http://lightspace3d.com