Scratch-resistant articles with a gradient layer
First Claim
1. An article comprising:
- a substrate having a surface; and
an optical film comprising a metal oxynitride disposed on the surface forming a coated surface,wherein the article exhibits a color shift of less than 2, when viewed at an incident illumination angle in the range from about 5 degrees to about 60 degrees from normal incidence under a CIE F2 illuminant, andwherein the article exhibits an average transmittance or average reflectance having an average oscillation amplitude of about 10 percentage points or less, over an optical wavelength regime.
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0 Petitions
Accused Products
Abstract
Embodiments of this disclosure pertain to articles that exhibit scratch-resistance and improved optical properties. In some examples, the article exhibits a color shift of about 2 or less, when viewed at an incident illumination angle in the range from about 0 degrees to about 60 degrees from normal under an illuminant. In one or more embodiments, the articles include a substrate, and an optical film disposed on the substrate. The optical film includes a scratch-resistant layer and a refractive index gradient. In one or more embodiments, the refractive index includes a refractive index that increases from a first surface at the interface between the substrate and the optical film to a second surface. The refractive index gradient may be formed from a compositional gradient and/or a porosity gradient.
263 Citations
19 Claims
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1. An article comprising:
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a substrate having a surface; and an optical film comprising a metal oxynitride disposed on the surface forming a coated surface, wherein the article exhibits a color shift of less than 2, when viewed at an incident illumination angle in the range from about 5 degrees to about 60 degrees from normal incidence under a CIE F2 illuminant, and wherein the article exhibits an average transmittance or average reflectance having an average oscillation amplitude of about 10 percentage points or less, over an optical wavelength regime. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An article comprising:
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a substrate comprising a substrate surface; and an optical film comprising a metal oxynitride disposed on the surface forming a coated surface, wherein the optical film comprises a first surface adjacent to the substrate surface, a second surface, and a refractive index gradient extending from the first surface to the second surface, wherein the refractive index at the second surface is greater than the refractive index at the first surface, wherein the article exhibits an average transmittance or average reflectance having an average oscillation amplitude of about 10 percentage points or less, over an optical wavelength regime, and wherein the article exhibits a hardness in the range from about 8 GPa to about 50 GPa as measured on the coated surface 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. - View Dependent Claims (13, 14, 15, 16)
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17. A method of forming an article comprising:
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providing a substrate having a major surface and comprising an amorphous substrate or a crystalline substrate; disposing an optical film having a thickness and comprising a metal oxynitride on the major surface; and creating a refractive index gradient along at least a portion of the thickness of the optical film, wherein the article exhibits an average light transmittance having an average amplitude of less than about 5%, over the optical wavelength regime. - View Dependent Claims (18, 19)
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Specification