Sunglasses vs laptop screen

Most LCDs use a polarizing filter to help you see the screen in bright sunlight. But so do polarized sunglasses, meaning the two essentially cancel each other out, causing your LCD screen to appear dark or completely black when you look at it.

What tends to happen is your polarized sunglasses do their job by only allowing light to pass through vertically. Meanwhile, your laptop screen emits horizontally vibrating light while blocking vertical light.

Your lenses and screen end up counteracting each other by working in opposite directions. As a result, you wind up seeing a dark or blacked-out image.

It would be nice if laptop manufacturers could ensure the light emitted was vertically polarized.

[MDSBock]

The sunglasses and laptop screen are polarised if you can't see the computer screen while wearing sunglasses turn your head 90° or take off sunglasses. Polarised glasses remove sun glare off glass surfaces. Great for driving and seeing below water surface for fishing....You can buy Polarised sun glasses for $5, if unsure when buying polarised glasses, take two glasses, line them up looking through both lenses turn one pair 90°, both lenses should turn dark just like the video...

[abbie]

What's the purpose of these glasses?
You won't be able to see screens while wearing them??