The U.S. Patent and Trademark Office has published Apple's patent application for a foldable device with
What it is
The special display coating has a layer that heals itself. Of course, a broken screen will not "heal", but minor scratches and dents should disappear.
The description says: “During the operation of an electronic device, scratches or abrasions may appear on its cover layer. To improve the appearance of an electronic device, you need to minimize their presence. To reduce the number of dents, scratches and other defects, the cover layer of the display may contain self-healing material. "
The documentation also notes that self-healing can be initiated or accelerated by exposure to heat, light, electric current, or other external stimuli.
This coating can be used on the entire display or only at the fold.</ p>