The end result would be a sort of folding screen that would project a hologram, he says.

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Speaking of the hinge, the act of folding the screen back into tablet mode feels controlled, but it isn't so tightly bound that you'll ever struggle to move the display this way and that.

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The hinge technology will have to be an engineering marvel, and making the folding crease of the screen invisible will pose problems in materials, optics, and touch technologies.

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