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A comment on Magic Leap’s technology may be years away from completion. Parent comment

Re:Magic Leap’s technology may be years away from completion by AstralStorm on Saturday December 10, 2016 @04:12AM (#13144820)
You mean a TN LCD screen? They work exactly like this, using liquid crystal to change polarisation angle. Pretty much every LCD ever.

It can give pure black if the polarising plates and liquid crystal is accurate enough.

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