Kyle McDonald on Twitter: "if you've ever tried to use a smartphone while wearing polarized sunglasses, you've seen how the screen "dims". i've dreamt of using this technique to build a camera
This iPhone hack turns your phone into a canvas only you can see
Iceagle | Shenzhen
These sunglasses make the TV screen look like they're not on. : r/mildlyinteresting
Polarized Sunglasses And iPhone - Black Screen Solution
How to make a computer screen INVISIBLE: Scientist shows how to make your monitor blank to everyone but you using 3D glasses | Daily Mail Online
iPhone 5 + Polarized Sunglasses not a good mix | MacRumors Forums
Why You Can't See The iPhone Screen With Polarized Sunglasses?
Seeing your phone's screen while wearing sunglasses just takes one quick trick
Why Do Polarized Sunglasses Make It Difficult to See LCD Screens?
Aftermarket iPhone LCD Screen Visibility Under Sunglasses - YouTube