https://wccftech.com/apple-heating-method-prevent-foldable-iphone-display-racking/

Apart from using a chemically strengthened Ceramic Shield glass to prevent the foldable iPhone display from breaking when bent, there are other scenarios that Apple is focusing on to improving the device’s durability. Extremely low temperatures can result in display cracks, so a new heating method might prevent that. Here is a look at the details.

Apple has been granted a patent that describes a method of keeping the folding area of the iPhone warm to prevent any unnecessary problems with the display later on. Patently Apple reports that a portion of the display that overlaps when bent needs to be treated to some kind of heat to avoid any damage. One idea was using a screen saver to warm up a portion of the screen as it crosses a bent axis.