Patent ID: 9079802
Filing Date: 2015-07-14
Classification: C03C,C04B,G02B,Y10T

Abstract:
1. An article comprising: a substrate having a surface and comprising a glass, a glass-ceramic, or single-crystal sapphire; and an optical film disposed on the substrate surface forming a coated surface, the optical film comprising a scratch-resistant layer and an optical interference layer disposed between the scratch-resistant layer and the substrate; wherein the article comprises a hardness of about 14 GPa or greater, as measured by indenting the coated surface with a Berkovitch indenter to form an indent having an indentation depth of at least about 100 nm from the surface of the coated surface, and wherein the article comprises an average transmission of 85% or greater; and wherein the article comprises a color shift of about 2 or less, when viewed at an incident illumination angle in the range from about 2 degrees to about 60 degrees from normal incidence, under an International Commission on Illumination illuminant selected from the group consisting of A series illuminants, B series illuminants, C series illuminants, D series illuminants, and F series illuminants, wherein color shift is calculated using the equation √((a*