Hack an Old LCD Monitor into a Polarized Privacy Monitor

If you have an old LCD display you can remove the polarized and anti-glare films from the inside of the monitor's glass surface and reassemble it; this will make the screen look bright white to the naked eye. To see the actual display you just need to use a bit of paint thinner to remove the anti-glare film from the polarization film and cut that to match the frames of an old pair of glasses. This produces a monitor that can only be seen when you're wearing the polarization filter glasses.

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