Low-color scratch-resistant articles with a multilayer optical film
First Claim
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 Berkovich indenter to form an indent having an indentation depth of at least about 100 nm from the surface of the coated surface,wherein the article exhibits a reflection or transmission color shift of about 2 or less, when viewed at an incident illumination angle in the range from about 20 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*2−
a*1)2+(b*2−
b*1)2), with a*1 and b*1 representing the coordinates of the article when viewed at normal incidence and a*2 and b*2 representing the coordinates of the article when viewed at the incident illumination angle.
2 Assignments
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 reflection or transmission color shift of about 2 or less, when viewed at an incident illumination angle in the range from about 20 degrees to about 60 degrees from normal under an illuminant and hardness of at least 14 GPa at an indentation depth of at least 100 nm from the surface of the article. 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 an optical interference layer. The optical interference layer may include one or more sub-layers that exhibit different refractive indices. In one example, the optical interference layer includes a first low refractive index sub-layer, a second a second high refractive index sub-layer, and an optional third sub-layer.
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Citations
25 Claims
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1. An article comprising:
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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 Berkovich indenter to form an indent having an indentation depth of at least about 100 nm from the surface of the coated surface, wherein the article exhibits a reflection or transmission color shift of about 2 or less, when viewed at an incident illumination angle in the range from about 20 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*2−
a*1)2+(b*2−
b*1)2), with a*1 and b*1 representing the coordinates of the article when viewed at normal incidence and a*2 and b*2 representing the coordinates of the article when viewed at the incident illumination angle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 18, 19, 20, 21, 22, 25)
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14. An article comprising:
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a substrate comprising a substrate surface and comprising a glass, a glass-ceramic, or a single-crystal sapphire; and an optical film disposed on the substrate surface forming a coated surface, wherein the optical film comprises a scratch-resistant layer and an optical interference layer disposed between the scratch-resistant layer and the substrate, the optical interference layer comprising at least one set of sub-layers, the set of sub-layers comprising a first low RI sub-layer and a second high RI sub-layer, wherein the article comprises a hardness in the range from about 14 GPa to about 50 GPa 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, wherein the article comprises a reflection or transmission color shift of less than about 2, when viewed at an incident illumination angle in the range from about 20 degrees to about 60 degrees from normal incidence under an International Commission on Illumination F2 illuminant, and wherein color shift is calculated using the equation √
((a*2−
a*1)2+(b*2−
b*1)2), with a*1, and b*1 representing the coordinates of the article when viewed at normal incidence and a*2, and b*2 representing the coordinates of the article when viewed at the incident illumination angle.- View Dependent Claims (15, 16, 17, 23, 24)
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Specification