At a particular orientation, the visual part of the display can be extinguished, leaving you looking at a black surface, as all the light is filtered out. However, mobile device displays also contain polarising filters and it's the alignment of display and glasses that causes the problem. They are particularly useful for skiers or drivers for reducing eyestrain, and pretty common on good quality sunglasses. Polarising lenses on glasses are popular because they reduce the glare, or reflected light, coming off surfaces. It's not necessarily the phone that's at fault, but it could be how it behaves with your expensive polarising sunglasses. You go to Insta that perfect picture and … wait … you can't see a thing on your smartphone display!?! (Pocket-lint) - The sun is shining, the sunglasses are out.
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