It seems that the answer to making a durable foldable starts by making the glass thinner in some areas and thicker in others. The glass thins out in areas where it might be expected to bend around the bend axis. To protect the display from drops and falls, corner portions of the display and other edge portions could be thicker. Apple feels that protecting the corner of the display in a fall or drop is very important.
“A foldable display may have a display cover layer and a flexible display panel. The foldable display may bend around a bend axis…The display cover layer may be formed from a layer of glass. A recess may be formed in the layer of glass that extends along the bend axis. The recess may form a flexible locally thinned portion in the layer of glass that allows the glass layer to bend around the bend axis. To ensure that the display cover layer exhibits satisfactory impact resistance during drop events corner portions of the display cover layer and other edge portions of the display cover layer may be provided with greater thickness relative to other portions of the display cover layer outside of the locally thinned portion.”-Apple

Illustration from Apple’s new patent. | Image credit-USPTO


Another illustration from Apple’s new patent. | Image credit-USPTO
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