Have you ever been annoyed by people reading or watching what's happening on your computer monitor, usually by quite conspicuously peering over your shoulder? Or perhaps you simply want a way to prevent people using your computer in a very straightforward, quite secure fashion without using software? Well, there's a hack for that.
User dimovi, who runs the laser cutting website cutyourway.com, has posted up a guide and video on how to do exactly this, by using an LCD monitor, polarised lenses, a cutting implement and some solvent.
Essentially, the hack involves reorienting the polarised filters in both the monitor itself, and in the set of glasses (3D glasses from the movies work great), so that when you look at the monitor normally, all you see is a white screen. On wearing the glasses, which are set at a specific orientation, the actual desktop display is visible. Without the glasses, its impossible for anyone else to view your desktop without having a polarised filter that they place in the correct orientation.
Check out the video below for a quick demo.
[Instructables via Make]
