iPhone Duo: How a Glass Screen Folds
Apple says its new iPhone Duo, which it calls the first foldable iPhone, has high-strength glass above and below the folding display panel. Glass is the stuff that cracks. So how does a screen with glass in it fold, and come back, every day?
This episode builds a folding screen from nothing, one layer at a time. Why thin glass stretches less when it bends. How a squeezed surface makes glass tougher. Why the layers need glue that still lets them slide. How a hinge makes room for the bend. And what a crease measurement, or a lab's fold count, can and can't tell you. Then we hold all of it up…
The skinny
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