>I wonder how practical it would be to make a private display by removing the polarising film from it and then viewing with polarised glasses.
In Japan a lot of people have "privacy" screen protectors on their cells that basically make the viewing angle very small. I always assumed it was through some form of polarization though now I'm not sure.
They probably have the same effect as an LCD with a very narrow viewing angle. Modern displays have a pretty high viewing angle; older ones start to change color and become illegible when viewed at an angle. I've seen the same thing on ATMs and the like.
In Japan a lot of people have "privacy" screen protectors on their cells that basically make the viewing angle very small. I always assumed it was through some form of polarization though now I'm not sure.
http://www.trendhunter.com/trends/mobile-privacy-screens-kee...