LOW-COLOR SCRATCH-RESISTANT ARTICLES WITH A MULTILAYER OPTICAL FILM
First Claim
1. A device comprising:
- a display comprising a user interface; and
a cover article disposed over the display, the cover article comprising a substrate having a surface, and an optical film disposed on the substrate surface forming a coated surface,wherein the cover article comprises a maximum hardness of 12 GPa or greater, as measured by a Berkovich Indenter Hardness Test along indentation depths of about 100 nm or greater, an average transmittance of 85% or greater over a visible spectrum, and a color shift of 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 illuminant comprising CIE A illuminants, CIE B illuminants CIE C illuminants, CIE D illuminants or CIE F illuminants,wherein color shift is determined by the equation √
((a*2−
a*1)2+(b*2−
b*1)2), where a*1 and b*1 are coordinates of the article when viewed at normal incidence and a*2, and b*2 are coordinates of the article viewed at the incident illumination angle, and wherein the coordinates of the article when viewed at normal incidence and at the incident illumination angle are both in transmittance or reflectance.
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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 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 and a second a second high refractive index sub-layer. In some instances, the optical interference layer may include a third sub-layer.
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Citations
34 Claims
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1. A device comprising:
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a display comprising a user interface; and a cover article disposed over the display, the cover article comprising a substrate having a surface, and an optical film disposed on the substrate surface forming a coated surface, wherein the cover article comprises a maximum hardness of 12 GPa or greater, as measured by a Berkovich Indenter Hardness Test along indentation depths of about 100 nm or greater, an average transmittance of 85% or greater over a visible spectrum, and a color shift of 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 illuminant comprising CIE A illuminants, CIE B illuminants CIE C illuminants, CIE D illuminants or CIE F illuminants, wherein color shift is determined by the equation √
((a*2−
a*1)2+(b*2−
b*1)2), where a*1 and b*1 are coordinates of the article when viewed at normal incidence and a*2, and b*2 are coordinates of the article viewed at the incident illumination angle, and wherein the coordinates of the article when viewed at normal incidence and at the incident illumination angle are both in transmittance or reflectance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A device comprising:
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a display comprising a user interface; and a cover article disposed over the display, the cover article comprising a substrate comprising a substrate surface, 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 cover article comprises a maximum hardness in the range from 12 GPa to about 50 GPa, as measured by a Berkovich Indenter Hardness Test along indentation depths of about 100 nm or greater, and wherein the cover article comprises a color shift of less than 2, when viewed at an incident illumination angle in the range from about 2 degrees to about 60 degrees from normal incidence under an illuminant comprising CIE A illuminants, CIE B illuminants CIE C illuminants, CIE D illuminants or CIE F illuminants, wherein color shift is determined by the equation √
((a*2−
a*1)2+(b*2−
b*1)2), where a*1 and b*1 are coordinates of the article when viewed at normal incidence and a*2, and b*2 are coordinates of the article viewed at the incident illumination angle, and wherein the coordinates of the article when viewed at normal incidence and at the incident illumination angle are both in transmittance or reflectance. - View Dependent Claims (20, 21, 22)
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23. An article comprising:
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a substrate having a surface; and an optical film disposed on the substrate surface forming a coated surface, the optical film comprising a scratch-resistant layer; wherein the article comprises 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 incidence under an illuminant, wherein the article comprises an abrasion resistance comprising about 1% haze or less, as measured using a hazemeter having an aperture, wherein the aperture has a diameter of about 8 mm, and wherein the abrasion resistance is measured after a 500-cycle abrasion using a Taber Test. - View Dependent Claims (24, 25, 26, 27, 28)
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29. An article comprising:
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a substrate having a surface; and an optical film disposed on the substrate surface forming a coated surface, the optical film comprising a scratch-resistant layer; wherein the article comprises 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 incidence under an illuminant, wherein the article comprises an abrasion resistance comprising a scattered light intensity of about 0.1 (in units of 1/steradian) or less, at a polar scattering angle in the range from about 15°
to about 60°
, as measured at normal incidence in transmission using an imaging sphere for scatter measurements, with a 2 mm aperture at 600 nm wavelength, andwherein the abrasion resistance is measured after a 500-cycle abrasion using a Taber Test. - View Dependent Claims (30, 31, 32, 33, 34)
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Specification