US Patent 11921259 Oleophobic coatings for glass structures in electronic devices

An electronic device includes electrical components in a housing. The components may include optical components such as a display. Protective structures may be used to protect the optical components. The protective structures may include one or more protective transparent layers such as layers of glass or crystalline material such as sapphire. The protective transparent layers may be coated with an oleophobic coating. To enhance coating durability, catalyst may be used to help bond the oleophobic coating. An adhesion promotion layer such as a silicon oxide layer may be deposited on the transparent protective layer. A catalyst layer such as a layer of sodium fluoride may be deposited on the adhesion promotion layer. The oleophobic material may be evaporated or otherwise deposited on the catalyst layer. Heat and moisture may help the oleophobic material form chemical bonds with the adhesion promotion layer, thereby forming a durable oleophobic coating.