Originally Posted by Sil_liS
The logic of the OP goes like this: it's summer and you want to read outside. Reading on a tablet like the ipad isn't possible unless you are in the shade because of the glare. But there are polarized sunglasses that are made to block the sunlight reflected by a body of water for example, because that light is linearly polarized. The reason why they can't work with the currently available tablets is because these also emit polarized light, so some viewing angles would be effectively blocked by the glasses.
This new patent is about a filter placed in front of the screen that will turn the linearly polarized light emitted by the screen into circularly polarized light that can be viewed through polarized sunglasses at all angles. The result of this will be that you can still use the future ipad without glasses if you are indoors, but you will need glasses if you want to use it outside.
So, with the current technology you can't read in direct sunlight because of the reflection, and you can't use polarized sunglasses because polarized lenses can make LCD displays look wonky (one of the reason pilots don't wear polarized sunglasses, since they have LCD gauges in the cockpit). The new technology referred to in the patent allows
you to use polarized lenses, more so than it requires it.