Home-built privacy monitor made from an old LCD
Basically, the secret behind the hack is the polarized film, which is normally used to filter backlight from what's actually visible on the screen
Article Summary
Many of us still keep old LCDs that should have been discarded long time ago. There might be a good reason, however, to refrain from disposing of this obsolete equipment. By following a few simple steps, anyone can turn an old LCD into a privacy monitor with contents visible only to the person wearing a pair of special glasses (also home-built), while anyone else can only see a white surface.
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