Foldable substrates and methods of making

A method of making a foldable substrate comprising a substrate thickness defined between a first major surface and a second major surface opposite the first major surface, a central thickness less than the substrate thickness defined between a first central surface area and a second central surface area opposite the first central surface area, the first central surface area recessed from the first major surface by a first distance, and a central portion comprising the central thickness positioned between a first portion and a second portion, the method comprising:

• laminating the foldable substrate with a first support layer contacting the first major surface and a second support layer contacting the second major surface;
• then,
• removing a peripheral portion of an initial edge of the foldable substrate to form an intermediate edge of the foldable substrate, the initial edge extending around an entire periphery of the foldable substrate between the first major surface and the second major surface in the first portion and the second portion as well as between the first central surface area and the second central surface area in the central portion;
• then,
• contacting the intermediate edge with a second etchant to form a blunted edge extending around an entire periphery of the foldable substrate between the first major surface and the second major surface in the first portion and the second portion as well as between the first central surface area and the second central surface area in the central portion, the blunted edge comprising a first blunted surface area where the blunted edge meets the first major surface, and the blunted edge comprising a second blunted surface area where the blunted edge meets the second major surface;
• removing the first support layer and the second support layer;
• then,
• disposing a first barrier layer over the first central surface area and disposing a second barrier layer over the second central surface area opposite the first central surface area;
• then,
• chemically strengthening the first portion and the second portion;
• and then,
• removing the first barrier layer and removing the second barrier layer.