Electronic Devices with Multi-Layer Cover Layers

A display, comprising:

• a flexible display having first and second display regions that fold relative to one another about a fold axis;
• and
• a cover layer through which the flexible display displays images, the cover layer comprising:
• an outer glass layer comprising first and second portions respectively overlapping the first and second display regions and joined by a third portion that bends about the fold axis, wherein the outer glass layer has uniform thickness across the first, second, and third portions;
• and
• an inner glass layer comprising third and fourth portions respectively overlapping the first and second display regions and separated by a gap that overlaps the fold axis.

A foldable display cover layer, comprising:

• a first glass layer comprising first and second planar portions joined by a third portion that bends about a fold axis, wherein the first glass layer has uniform thickness across the first, second, and third portions;
• and
• a second glass layer comprising third and fourth portions respectively overlapping the first and second portions of the first glass layer, wherein the third and fourth portions are separated by a gap that overlaps the fold axis, wherein the second glass layer has at least one property that is different from the first glass layer, and wherein the at least one property is selected from the group consisting of:
• modulus of elasticity, compressive stress, and thickness.