DIY: How to make your computer screen invisible to everyone except you

Are you tired of nosy co-workers peering over your shoulder while you are trying to finish an important project? Does your family ignore your right to privacy when you are using your laptop? Well, with the right know-how, you can transform your ordinary computer screen into a privacy screen that hides your work and actions from prying eyes. All you need is a laptop screen or monitor, a utility knife, and a pair of 3-D glasses.