Durable anti-reflective articles
First Claim
1. An article comprising:
- a substrate having a major surface; and
an anti-reflective coating having a physical thickness of from about 0.2 μ
m to about 1 μ
m disposed on the major surface, the anti-reflective coating comprising an anti-reflective surface, wherein the anti-reflective coating comprises a plurality of alternating low and high refractive index layers that ranges from five (5) layers to seven (7) layers and comprises a first low refractive index (RI) layer of SiO2 disposed on and in direct contact with the major surface, at least one additional low RI layer of SiO2, and at least one high RI layer, and wherein a total physical thickness of the high RI layers is greater than about 30% of the total physical thickness of the anti-reflective coating,wherein each high RI layer consists of SiOxNy, or SiuAlvOxNy,wherein the first low RI layer disposed on and in direct contact with the major surface of the substrate has an optical thickness from about 15 nm to about 200 nm,wherein each low RI layer has a refractive index from about 1.3 to about 1.7 and each high RI layer has a refractive index of greater than about 1.9,wherein the article exhibits a maximum hardness of about 10 GPa or greater as measured by a Berkovich Indenter Hardness Test along an indentation depth of about 50 nm or greater, andwherein the article exhibits;
a single side average visible photopic light reflectance of about 2% or less.
1 Assignment
0 Petitions
Accused Products
Abstract
Embodiments of durable, anti-reflective articles are described. In one or more embodiments, the article includes a substrate and an anti-reflective coating disposed on the major surface. The article exhibits an average light transmittance of about 94% or greater over an optical wavelength regime and/or an average light reflectance of about 2% or less over the optical wavelength regime, as measured from an anti-reflective surface. In some embodiments, the article exhibits a maximum hardness of about 8 GPa or greater as measured by a Berkovich Indenter Hardness Test along an indentation depth of about 50 nm or greater and a b* value, in reflectance, in the range from about −5 to about 1 as measured on the anti-reflective surface only at all incidence illumination angles in the range from about 0 degrees to about 60 degrees under an International Commission on Illumination illuminant.
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Citations
29 Claims
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1. An article comprising:
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a substrate having a major surface; and an anti-reflective coating having a physical thickness of from about 0.2 μ
m to about 1 μ
m disposed on the major surface, the anti-reflective coating comprising an anti-reflective surface, wherein the anti-reflective coating comprises a plurality of alternating low and high refractive index layers that ranges from five (5) layers to seven (7) layers and comprises a first low refractive index (RI) layer of SiO2 disposed on and in direct contact with the major surface, at least one additional low RI layer of SiO2, and at least one high RI layer, and wherein a total physical thickness of the high RI layers is greater than about 30% of the total physical thickness of the anti-reflective coating,wherein each high RI layer consists of SiOxNy, or SiuAlvOxNy, wherein the first low RI layer disposed on and in direct contact with the major surface of the substrate has an optical thickness from about 15 nm to about 200 nm, wherein each low RI layer has a refractive index from about 1.3 to about 1.7 and each high RI layer has a refractive index of greater than about 1.9, wherein the article exhibits a maximum hardness of about 10 GPa or greater as measured by a Berkovich Indenter Hardness Test along an indentation depth of about 50 nm or greater, and wherein the article exhibits; a single side average visible photopic light reflectance of about 2% or less. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An article comprising:
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a substrate having a major surface; and an anti-reflective coating having a physical thickness of from about 0.2 μ
m to about 1 μ
m disposed on the major surface, the anti-reflective coating comprising a plurality of alternating low and high refractive index layers that ranges from five (5) layers to seven (7) layers and comprises a first low refractive index (RI) layer of SiO2 disposed on and in direct contact with the major surface, at least one additional low RI layer of SiO2, and at least one high RI layer, and wherein a total physical thickness of the high RI layers is greater than about 30% of the total physical thickness of the anti-reflective coating,wherein each high RI layer consists of SiOxNy, or SiuAlvOxNy, wherein the first low RI layer disposed on and in direct contact with the major surface of the substrate has an optical thickness from about 15 nm to about 200 nm, wherein each low RI layer has a refractive index from about 1.3 to about 1.7 and each high RI layer has a refractive index of greater than about 1.9, wherein the article exhibits; a maximum hardness of about 10 GPa or greater as measured by a Berkovich Indenter Hardness Test along an indentation depth of about 50 nm or greater; a single side average visible photopic light reflectance of about 2% or less; and a reflectance angular color shift of about 10 or less, as measured on the anti-reflective surface from normal incidence to an incident illumination angle of about 60 degrees under a D65 illuminant or F2 illuminant, wherein angular 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, andfurther wherein the article exhibits either one or both article transmittance color coordinates in the (L*, a*, b*) colorimetry system at normal incidence the D65 or F2 illuminant exhibiting a reference point color shift of less than about 2 from a reference point as measured at the anti-reflective surface, the reference point comprising at least one of the color coordinates (a*=0, b*=0) and the transmittance color coordinates of the substrate, and article reflectance color coordinates in the (L*, a*, b*) colorimetry system at normal incidence exhibiting a color shift of less than about 5 from a reference point as measured at the anti-reflective surface, the reference point comprising at least one of the color coordinates (a*=0, b*=0), the coordinates (a*=−
2, b*=−
2), and the reflectance color coordinates of the substrate,wherein, when the reference point is the color coordinates (a*=0, b*=0), the color shift is defined by √
((a*article)2+(b*article)2),wherein, when the reference point is the color coordinates (a*=−
2, b*=−
2), the color shift is defined by √
((a*article+2)2+(b*article+2)2), andwherein, when the reference point is the color coordinates of the substrate, the color shift is defined by √
((a*article−
a*substrate)2+(b*article−
b*substrate)2). - View Dependent Claims (22, 23, 24)
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25. An article comprising:
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a substrate having a major surface; and an anti-reflective coating having a physical thickness of from about 0.2 μ
m to about 1 μ
m disposed on the major surface, wherein the anti-reflective coating comprises a plurality of alternating low and high refractive index layers that ranges from five (5) layers to seven (7) layers and comprises a first low refractive index (RI) layer of SiO2 disposed on and in direct contact with the major surface, at least one additional low RI layer of SiO2, and at least one high RI layer, and wherein a total physical thickness of the high RI layers is greater than about 30% of the total physical thickness of the anti-reflective coating,wherein each high RI layer consists of SiOxNy, or SiuAlvOxNy, wherein the first low RI layer disposed on and in contact with the major surface of the substrate has an optical thickness from about 15 nm to about 200 nm, wherein each low RI layer has a refractive index from about 1.3 to about 1.7 and each high RI layer has a refractive index of greater than about 1.9, wherein the article exhibits an abrasion resistance comprising any one or more of; about 1% haze or less, as measured using a hazemeter having an aperture, wherein the aperture has a diameter of about 8 mm, an average roughness, as measured by atomic force microscopy, of about 12 nm RMS or less, a scattered light intensity of about 0.05 (in units of 1/steradian) or less, at a polar scattering angle of about 40 degrees or less, as measured at normal incidence in transmission using an imaging sphere for scatter measurements, with a 2 mm aperture at 600 nm wavelength, and a scattered light intensity of about 0.1 (in units of 1/steradian) or less, at a polar scattering angle of about 20 degrees or less, as measured at normal incidence in transmission using an imaging sphere for scatter measurements, with a 2 mm aperture at 600 nm wavelength, wherein the abrasion resistance is measured after a 500-cycle abrasion using a Taber Test, and wherein the article exhibits a single side average visible photopic reflectance of about 2% or less over the optical wavelength regime at normal incidence under a D65 or F2 illuminant. - View Dependent Claims (26, 27)
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28. An article comprising:
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a substrate having a major surface; and an anti-reflective coating having a physical thickness of from about 0.2 μ
m to about 1 μ
m disposed on the major surface, wherein the anti-reflective coating comprises a plurality of alternating low and high refractive index layers that ranges from five (5) layers to seven (7) layers and comprises a first low refractive index (RI) layer of SiO2 disposed on and in direct contact with the major surface, at least one additional low RI of SiO2, and at least one high RI layer, and wherein a total physical thickness of the high RI layers is greater than about 30% of the total physical thickness of the anti-reflective coating,wherein each high RI layer comprises consists of SiOxNy, or SiuAlvOxNy, wherein the first low RI layer disposed on and in contact with the major surface of the substrate has an optical thickness from about 15 nm to about 200 nm, wherein each low RI layer has a refractive index from about 1.3 to about 1.7 and each high RI layer has a refractive index of greater than about 1.9, wherein the article exhibits single side average visible photopic reflectance of about 1.5% or less over the optical wavelength regime at normal incidence under a D65 or F2 illuminant, and wherein the article exhibits a reflectance angular color shift of about 10 or less, as measured on the anti-reflective surface from normal incidence to an incident illumination angle of about 60 degrees under a D65 illuminant or F2 illuminant and wherein angular 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 (29)
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Specification