why isn’t possible to see phone display horizontally while wearing polarized sunglasses?
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An OLED phone would work but most have LCD displays. Liquid crystals in those displays work by twisting the polarisation of light and they need a polarising filter in front of them to block light that hasn’t been twisted. That way, only light from the active pixels makes it through and the inactive pixels look black. An unavoidable side effect is that all the light coming from an LCD display is polarised.
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