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How to Hack an Old LCD Monitor into a Secret Computer Screen That Only You Can See

Oct 31, 2013 10:20 PM

Glasses held in front of a computer monitor displaying a 3D cube.

No matter your reason, if you want to hide what's on your computer screen from prying eyes, there are plenty of ways to do it. You can get a privacy filter, install a panic button for your browser, or just develop super fast reflexes. But all it takes is the right angle or a too-slow reaction to blow your cover.

Want a foolproof way to make sure you are the only one who can see what's on your screen? Brusspup has just the fix for you.

He built an "Amazing Secret Monitor" by stripping the polarized layer off an old LCD screen and adding a layer to a pair of glasses. This way, what's on the monitor can only be seen by the person wearing the polarized glasses.

Cat sitting in front of a computer screen with hands holding sunglasses.

It's pretty easy to do and only requires basic tools like scissors and an X-Acto knife. You can order the polarized filter online and just use an old LCD monitor you have lying around.

If you don't have one you never use, your best bet is to grab one from the thrift store (if it's not clear yet, you'll be destroying the monitor).

The entire process shouldn't take more than 30 minutes. Take a look at the video to see how it's done.

You can find more details in the YouTube description, and be sure to check out some of brusspup's other work for Rubik's Cube illusions, shampoo tricks, zigzagging streams of water, and more.

The next big software update for iPhone is coming sometime in April and will include a Food section in Apple News+, an easy-to-miss new Ambient Music app, Priority Notifications thanks to Apple Intelligence, and updates to apps like Mail, Photos, Podcasts, and Safari. See what else is coming to your iPhone with the iOS 18.4 update.