Patent ID: 11927722
Assignee: CORNING INCORPORATED
Field: Materials, metallurgy (Chemistry)
Classification: CPC G  C | IPC G

Claim 4:
5. An article, comprising:
a glass-ceramic substrate comprising a first primary surface and a second primary surface, the first primary surface and the second primary surface opposing one another; and
an optical film structure defining an outer surface, the optical film structure disposed on the first primary surface,
wherein the glass-ceramic substrate comprises an elastic modulus of greater than 85 GPa and a fracture toughness of greater than 0.8 MPa·√m,
the optical film structure comprises a plurality of alternating high refractive index (RI) and low RI layers;
the optical film structure comprises a scratch-resistant layer, and outer structure and an inner structure, the scratch-resistant layer disposed between the outer and inner structures, and the scratch-resistant layer has a thickness from about 100 nm to about 10,000 nm.