Durable cover plate article with optical bandpass filtering for sensors

Abstract

Described herein is a cover panel article for a sensor, the cover panel article comprising: a substrate; and an outer layering film disposed on the substrate. The outer layered film includes alternating high refractive index (RI) layers and low RI layers. Each of the high RI layers includes a nitride or an oxynitride. The physical thickness of the outer layered film may be from about 500 nm to 12,000 nm. The article has at least two non-overlapping wavelength bands, each band having a bandwidth of 5 nm to 200 nm and a central wavelength within a spectrum of 400 nm to 1200 nm. Further, the article exhibits: for each of the at least two non-overlapping wavelength bands, (a) within an angle of incidence of 2 gt; 70% average dual surface transmittance, and (b) tilt within an angle of incidence of 2 to 9; and the average double-surface transmittance is 50%.

Description

[0001] Priority Statement

[0002] This application claims priority to U.S. Provisional Application Serial No. 63 / 538,300, filed September 14, 2023, pursuant to 35 USC §119, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] This disclosure relates to durable and / or scratch-resistant cover articles for electronic devices, and more specifically to durable, scratch-resistant and / or chemically resistant cover articles having discrete wavelength transmission bands for biometric sensors and other sensors. Background Technology

[0004] Cover plates are commonly used to protect critical components within electronic products, providing user interfaces for input and / or display, and / or many other functions. Such products include mobile devices such as cell phones, MP3 players, smartwatches, and tablets. Cover plates also include architectural products, transportation products (e.g., products for automotive applications, trains, airplanes, ships, etc.), electrical products, or any product requiring a certain degree of transparency, scratch resistance, abrasion resistance, or a combination thereof. These applications typically require scratch resistance as well as excellent optical properties with maximum light transmittance and minimum reflectance. Furthermore, for certain sensor applications, cover plates exhibit high light transmittance and low reflectance in specific wavelength bands, thus functioning as bandpass filters to improve sensor functionality.

[0005] For biometric sensor applications, the development and deployment of optical sensors are increasing in number and variety. Among the most common are heart rate monitors in commercial smartwatches. New versions of these sensors are constantly being created with added functionality, such as electrocardiogram (ECG), body temperature, heart rate variability, respiratory rate, blood oxygen, blood pressure, and blood glucose sensing. New form factors are also being tested, including integrating optical sensors into smart rings, smart glasses, or other wearable devices. Compared to sensors based on measuring the electrical properties of skin or other biological materials, optical sensors can be more robust and resistant to environmental and electrical interference. These optical sensors can use laser diodes or LED emitters and photodiode detectors optimized for different wavelengths of light. In some cases, multi-wavelength photoplethysmography (PPG) can be used to improve the accuracy of biometric detection for a wide range of users with varying skin melanin levels.

[0006] Optical biosensing technologies, such as PPGs, can beneficially utilize multi-wavelength operation to enhance biometric detection or sensitivity. The benefits of multiple wavelengths relate to the different depths of light penetration into the human body. Different wavelengths can also provide different sensitivities in transmission or reflection modes. For example, reflective PPGs are typically used to detect surface pulsations in the 450–590 nm wavelength range for heart rate monitoring, while transmission PPGs typically select the red (600–750 nm) or infrared (800–1200 nm) range. The exact wavelength chosen within this range is usually related to the availability of the LED or other light source at that specific wavelength. Multi-wavelength reflective PPGs can be used to reduce heart rate detection errors due to motion artifacts. Additionally, multi-wavelength PPGs utilizing at least two wavelengths have been used to calculate or estimate blood oxygen saturation, blood pressure (and in some cases, pulse conduction time), and blood glucose.

[0007] It should be noted that 'reflective PPG' can be used to refer to measurements where both the light source and detector are located on the same side of the body surface. However, this does not necessarily mean that the detected light is reflected from the outer surface of the skin. In contrast, especially for red and IR wavelengths, light transmits under the skin and undergoes multiple scattering events and a 'banana-shaped' light path before ultimately 'reflecting' back to the detector from the skin. Therefore, it may be beneficial to limit the angle of light emission and detection to a near-normal angle, so that most of the light of at least one wavelength detected by the sensing system is this kind of 'transmitted and reflected' light under the surface, which transmits under the skin and ultimately exits the skin from the same side that entered the light, thus encompassing what is known as a reflective PPG.

[0008] Therefore, there is a need for durable and / or scratch-resistant cover plates for electronic devices, especially durable, scratch-resistant and / or chemical-resistant cover plates with optical functions (including discrete wavelength transmission bands) for biometric sensors and other sensors. Summary of the Invention

[0009] This disclosure generally relates to cover plates that address the aforementioned needs and other needs in the prior art. For example, this disclosure aims to address the aforementioned needs by designing a specially configured multilayer optical coating that preferentially transmits the target sensor wavelength at a normal incident angle, while blocking these same wavelengths at higher incident angles, thereby improving sensor sensitivity by blocking stray ambient light and / or increasing the amount of signal from light traveling beneath the outer surface of the skin. Generally, the disclosed cover plates employ an outer layer film disposed on a substrate (e.g., a glass substrate, Corning® GorillaGlass® products, glass-ceramic substrates, etc.). These cover plates possess high hardness, scratch resistance, chemical resistance, and favorable optical properties suitable for a variety of applications, including sensor devices. The outer layer film of the cover plate is a designed multilayer film structure, and the cover plates of this disclosure reflect novel system-level designs configured to provide optical functionality for sensor systems and cover plates for other sensors. This optical function may include a bandpass filter that has high transmittance for light of a specific wavelength at normal incident angles (e.g., 0-10 degrees) and low transmittance for one or more of these same wavelengths at higher incident angles.

[0010] According to one aspect of this disclosure, a cover plate article for a sensor is provided, the cover plate article comprising: a substrate, the substrate including an outer main surface and an inner main surface, wherein the outer main surface and the inner main surface are opposite to each other; and an outer layer film, the outer layer film including an outermost surface, the outer layer film being disposed on the outer main surface or the inner main surface of the substrate. The outer layer film includes a plurality of alternating high refractive index layers and low refractive index layers. The refractive index of each of the high refractive index layers is greater than the refractive index of each of the low refractive index layers. The cover plate article has at least one transmission wavelength band, the at least one transmission wavelength band having a bandwidth of 5 nm to 200 nm and a center wavelength in a spectrum of 400 nm to 1200 nm, and the cover plate article having: (a) within a target transmission wavelength band, in Up to 2 (a) an average bisurface transmittance greater than 70% within the incident angle range; and (b) within the target wavelength band, at 2 Up to 9 The average double-surface transmittance is less than 50% within the incident angle range. Further, in embodiments, the cover plate article may have at least two non-overlapping wavelength bands, each band having a bandwidth of 5 nm to 200 nm and a center wavelength in the spectrum of 400 nm to 1200 nm. Additionally, in embodiments having two or more transmission wavelength bands, the cover plate article exhibits that, for each of the at least two non-overlapping wavelength bands, (a) in Up to 2 The average double-surface transmittance is greater than 70% within the incident angle range, and (b) in 2 Up to 9 The average double-surface transmittance is less than 50% within the incident angle range. This can be used as a durable and / or scratch-resistant cover for electronic devices, especially for durable, scratch-resistant and / or chemically resistant cover with optical functions (including discrete wavelength transmission bands) for biometric sensors and other sensors.

[0011] According to another aspect of this disclosure, a cover plate article for a sensor is provided, the cover plate article comprising: a substrate having an outer main surface and an inner main surface, wherein the outer main surface and the inner main surface are opposite to each other; and an outer layer film having an outermost surface disposed on the outer main surface or the inner main surface of the substrate. The outer layer film comprises a plurality of alternating high-refractive-index layers and low-refractive-index layers. Each of the low-refractive-index layers comprises silicon oxide. Each of the high-refractive-index layers comprises silicon nitride, silicon oxynitride, TiO2, Nb2O5, Ta2O5, or ZrO2, and the refractive index of each high-refractive-index layer is greater than the refractive index of each low-refractive-index layer. The physical thickness of the outer layer film is from about 500 nm to 12,000 nm. Furthermore, the outer layer film comprises a plurality of periods (N), each period (N) comprising a low-refractive-index layer and a high-refractive-index layer, and the plurality of periods (N) is from 5 to 100 periods. Furthermore, the cover plate article has at least two non-overlapping wavelength bands, each band having a bandwidth of 5 nm to 200 nm and a center wavelength in the spectrum of 400 nm to 1200 nm. Additionally, the cover plate article exhibits that, for each of the at least two non-overlapping wavelength bands, (a) in Up to 2 The average double-surface transmittance is greater than 70% within the incident angle range, and (b) in 2 Up to 9 The average double-surface transmittance is less than 50% within the incident angle range. This can be used as a durable and / or scratch-resistant cover for electronic devices, especially for durable, scratch-resistant and / or chemically resistant cover with optical functions (including discrete wavelength transmission bands) for biometric sensors and other sensors.

[0012] According to a further aspect of this disclosure, a cover plate article for a sensor is provided, the cover plate article comprising: a substrate having an outer main surface and an inner main surface, wherein the outer main surface and the inner main surface are opposite to each other; and an outer layer film having an outermost surface disposed on the outer main surface or the inner main surface of the substrate. The outer layer film comprises a plurality of alternating high-refractive-index layers and low-refractive-index layers. Each of the high-refractive-index layers comprises a nitride, oxynitride, TiO2, Nb2O5, Ta2O5, or ZrO2, and the refractive index of each of the high-refractive-index layers is greater than the refractive index of each of the low-refractive-index layers. Additionally, the outer layer film includes a scratch-resistant layer comprising a nitride, oxynitride, TiO2, Nb2O5, Ta2O5, or ZrO2, and the physical thickness of the outer layer film is from about 150 nm to 10,000 nm. The physical thickness of the outer layer film is approximately 500 nm to 12,000 nm. Further, the cover plate article has at least two non-overlapping wavelength bands, each band having a bandwidth of 5 nm to 200 nm and a center wavelength in the spectrum of 400 nm to 1200 nm. Additionally, the cover plate article exhibits that, for each of the at least two non-overlapping wavelength bands, (a) in Up to 2 The average double-surface transmittance is greater than 70% within the incident angle range, and (b) in 2 Up to 9 The average double-surface transmittance is less than 50% within the incident angle range. This can be used as a durable and / or scratch-resistant cover for electronic devices, especially for durable, scratch-resistant and / or chemically resistant cover with optical functions (including discrete wavelength transmission bands) for biometric sensors and other sensors.

[0013] According to a further aspect of this disclosure, a cover plate article for a sensor is provided, the cover plate article comprising a substrate having an outer main surface and an inner main surface, wherein the outer main surface and the inner main surface are opposite to each other. The cover plate article further comprises an outer layer film having an outermost surface disposed on either the outer main surface or the inner main surface of the substrate. The outer layer film comprises a plurality of alternating high-refractive-index layers and low-refractive-index layers, wherein the refractive index of each high-refractive-index layer is greater than the refractive index of each low-refractive-index layer. The cover plate article has a transmission wavelength band having a bandwidth of 5 nm to 200 nm and a center wavelength of 510 nm to 590 nm. The cover plate article exhibits that, for the transmission wavelength band, (a) in Up to 1 Within the incident angle range or Up to 2 The average double-surface transmittance is greater than 70% within the incident angle range, and (b) in 3 Up to 9 Within the incident angle range or 5 Up to 9 The average double-surface transmittance is less than 50% within the incident angle range.

[0014] Additional features and advantages will be set forth in the detailed description below, and will be apparent in part from the description or by practice of the embodiments described herein, including the following detailed description, the claims and the drawings.

[0015] It should be understood that the foregoing general description and the following detailed description are merely exemplary and intended to provide an overview or framework for understanding the nature and features of the claims. Drawings are included to provide further understanding and are incorporated in and form part of this specification. The drawings illustrate one or more embodiments and, together with the description, serve to explain the principles and operation of the various embodiments. Attached Figure Description

[0016] Figure 1 This is a cross-sectional side view of a cover plate article according to one or more embodiments described herein;

[0017] Figure 1A This is a cross-sectional side view of a cover plate article according to one or more embodiments described herein;

[0018] Figure 2A It is a plan view of an exemplary electronic product that includes any of the cover articles disclosed herein;

[0019] Figure 2Byes Figure 2A A perspective view of an exemplary electronic product;

[0020] Figure 2C This is a top plan view of an exemplary smartwatch that includes any of the cover articles disclosed herein;

[0021] Figure 2D yes Figure 2C Bottom plan view of the smartwatch;

[0022] Figure 3A The bisurface transmittance of the cover article according to one or more embodiments described herein at wavelengths of 525 nm, 690 nm, and 940 nm varies with... Up to 9 The drawing varies depending on the angle of incidence;

[0023] Figure 3B yes Figure 3A The cover plate is designed for drawing the double-surface reflective colors under a D65 illuminator from all viewing angles from 0 to 90 degrees.

[0024] Figure 3C yes Figure 3A Cover plate products in and 5 A plot showing the variation of bisurface transmittance with wavelength at the incident angle;

[0025] Figure 4A The bisurface transmittance of the cover article according to one or more embodiments described herein at wavelengths of 525 nm, 690 nm, and 940 nm varies with... Up to 9 The drawing varies depending on the angle of incidence;

[0026] Figure 4B yes Figure 4A The cover plate is designed for drawing the double-surface reflective colors under a D65 illuminator from all viewing angles from 0 to 90 degrees.

[0027] Figure 5A The bisurface transmittance of the cover article according to one or more embodiments described herein at wavelengths of 525 nm, 690 nm, and 940 nm varies with... Up to 9 The drawing varies depending on the angle of incidence;

[0028] Figure 5B yes Figure 5A The cover plate is designed for drawing the double-surface reflective colors under a D65 illuminator from all viewing angles from 0 to 90 degrees.

[0029] Figure 6AThe bisurface transmittance of the cover article according to one or more embodiments described herein at wavelengths of 525 nm, 690 nm, and 940 nm varies with... Up to 9 The drawing varies depending on the angle of incidence;

[0030] Figure 6B yes Figure 6A The cover plate is designed for drawing the double-surface reflective colors under a D65 illuminator from all viewing angles from 0 to 90 degrees.

[0031] Figure 7A This is a plot of the bisurface transmittance of a cover article according to one or more embodiments described herein as a function of incident angles from 0° to 90° at wavelengths of 520 nm, 530 nm, and 535 nm.

[0032] Figure 7B This is a plot of the bisurface transmittance of a cover article according to one or more embodiments described herein as a function of incident angles from 0° to 90° at wavelengths of 640 nm, 645 nm, and 650 nm.

[0033] Figure 7C This is a plot of the bisurface transmittance of a cover article according to one or more embodiments described herein as a function of incident angles from 0° to 90° at wavelengths of 925 nm, 940 nm, and 955 nm.

[0034] Figure 7D yes Figures 7A-7C The cover plate is designed for drawing the double-surface reflective colors under a D65 illuminator from all viewing angles from 0 to 90 degrees.

[0035] Figure 8A This is a plot of the bisurface transmittance of a cover article according to one or more embodiments described herein as a function of incident angles from 0° to 90° at wavelengths of 520 nm, 530 nm, and 535 nm.

[0036] Figure 8B This is a plot of the bisurface transmittance of a cover article according to one or more embodiments described herein as a function of incident angles from 0° to 90° at wavelengths of 640 nm, 645 nm, and 650 nm.

[0037] Figure 8C This is a plot of the bisurface transmittance of a cover article according to one or more embodiments described herein as a function of incident angles from 0° to 90° at wavelengths of 925 nm, 940 nm, and 955 nm.

[0038] Figure 8D yes Figures 8A-8CThe cover plate is designed for drawing the double-surface reflective colors under a D65 illuminator from all viewing angles from 0 to 90 degrees.

[0039] Figure 9A This is a plot of the bisurface transmittance of a cover article according to one or more embodiments described herein as a function of incident angles from 0° to 90° at wavelengths of 520 nm, 530 nm, and 535 nm.

[0040] Figure 9B This is a plot of the bisurface transmittance of a cover article according to one or more embodiments described herein as a function of incident angles from 0° to 90° at wavelengths of 640 nm, 645 nm, and 650 nm.

[0041] Figure 9C This is a plot of the bisurface transmittance of a cover article according to one or more embodiments described herein as a function of incident angles from 0° to 90° at wavelengths of 925 nm, 940 nm, and 955 nm.

[0042] Figure 9D yes Figures 9A-9C The cover plate is designed for drawing the double-surface reflective colors under a D65 illuminator from all viewing angles from 0 to 90 degrees.

[0043] Figure 10A This is a plot of the bisurface transmittance of a cover article according to one or more embodiments described herein as a function of incident angles from 0° to 90° at wavelengths of 520 nm, 530 nm, and 535 nm.

[0044] Figure 10B This is a plot of the bisurface transmittance of a cover article according to one or more embodiments described herein as a function of incident angles from 0° to 90° at wavelengths of 640 nm, 645 nm, and 650 nm.

[0045] Figure 10C This is a plot of the bisurface transmittance of a cover article according to one or more embodiments described herein as a function of incident angles from 0° to 90° at wavelengths of 925 nm, 940 nm, and 955 nm.

[0046] Figure 10D yes Figures 10A-10C The cover plate is designed for drawing the double-surface reflective colors under a D65 illuminator from all viewing angles from 0 to 90 degrees.

[0047] Figure 11A This is a plot of the bisurface transmittance of a cover article according to one or more embodiments described herein as a function of incident angles from 0° to 90° at wavelengths of 520 nm, 530 nm, and 540 nm.

[0048] Figure 11B yes Figure 11A The cover plate is designed for drawing the double-surface reflective colors under a D65 illuminator from all viewing angles from 0 to 90 degrees.

[0049] Figure 12A This is a plot of the bisurface transmittance of a cover article according to one or more embodiments described herein as a function of incident angles from 0° to 90° at wavelengths of 520 nm, 530 nm, and 540 nm.

[0050] Figure 12B yes Figure 12A The cover plate is designed for drawing the double-surface reflective colors under a D65 illuminator from all viewing angles from 0 to 90 degrees.

[0051] Figure 13A This is a plot of the bisurface transmittance of a cover article according to one or more embodiments described herein as a function of incident angles from 0° to 90° at wavelengths of 520 nm, 530 nm, and 535 nm.

[0052] Figure 13B This is a plot of the bisurface transmittance of a cover article according to one or more embodiments described herein as a function of incident angles from 0° to 90° at wavelengths of 640 nm, 645 nm, and 650 nm.

[0053] Figure 13C This is a plot showing the bisurface transmittance of a cover plate article according to one or more embodiments described herein as a function of incident angles from 0° to 90° at wavelengths of 925 nm, 940 nm, and 955 nm; and

[0054] Figure 13D yes Figures 13A-13C The cover plate is designed for drawing the double-surface reflective colors under a D65 illuminator for all viewing angles from 0 to 90 degrees. Detailed Implementation

[0055] In the following detailed description, exemplary embodiments with specific details disclosed are set forth for purposes of explanation and not limitation to provide a thorough understanding of the various principles of this disclosure. However, it will be apparent to those skilled in the art who will benefit from this disclosure that this disclosure may be practiced in other embodiments that depart from the specific details disclosed herein. Furthermore, descriptions of well-known apparatuses, methods, and materials may be omitted to avoid obscuring the description of the various principles of this disclosure. Finally, wherever applicable, the same reference numerals refer to the same elements.

[0056] In this document, a range may be expressed as from “about” a specific value and / or to “about” another specific value. Another embodiment of expressing such a range includes from one specific value and / or to another specific value. Similarly, when a value is expressed as an approximation using the antecedent “about,” it should be understood that a specific value forms another embodiment. It should be further understood that each endpoint of a range is significant relative to and independent of the other endpoint.

[0057] The directional terms used in this article, such as “up,” “down,” “right,” “left,” “front,” “back,” “top,” and “bottom,” are used only with reference to the accompanying drawings and are not intended to imply any absolute orientation.

[0058] Unless otherwise expressly stated, it is not intended to interpret any method set forth herein as requiring its steps to be performed in a particular order. Therefore, if a method claim does not actually describe the order in which its steps should be followed, or if the claims or description do not otherwise specifically state that the steps should be limited to a particular order, then in no way is it implied that the order should be inferred. This applies to any possible non-expressive basis of interpretation, including: logical matters relative to the arrangement of steps or operational procedures; literal meaning derived from grammatical organization or punctuation; and the number or type of embodiments described in the specification.

[0059] As used herein, unless the context clearly indicates otherwise, the singular forms “a / an” and “the” include plural indicators. Thus, for example, unless the context clearly indicates otherwise, a reference to “component” includes aspects having two or more such components.

[0060] As used herein, the term "placement" includes coating, depositing, and / or forming material onto a surface using any method known or to be developed in the art. The placed material may constitute a layer as defined herein. As used herein, the phrase "placed on" includes forming material onto a surface such that the material is in direct contact with the surface, and embodiments of forming material on a surface and placing one or more intermediate materials between said material and said surface. Intermediate materials may constitute a layer as defined herein.

[0061] As used herein, the terms "low RI layer" and "high RI layer" refer to the relative values ​​of the refractive index ("RI") of the layers in the optical film structure of the cover glass article according to this disclosure (i.e., low RI layer < high RI layer). Therefore, the refractive index value of the low RI layer is less than that of the high RI layer. Further, as used herein, "low RI layer" and "low refractive index layer" are interchangeable and have the same meaning. Similarly, "high RI layer" and "high refractive index layer" are interchangeable and have the same meaning.

[0062] As used herein, the term "reinforced substrate" refers to a substrate used in the cover plate article of this disclosure that has been chemically strengthened, for example, by ion exchange between larger and smaller ions on the substrate surface. However, other strengthening methods known in the art, such as heat tempering, or by utilizing the mismatch in the coefficients of thermal expansion between different portions of the substrate to generate compressive stress and a central tension zone, can also be used to form a reinforced substrate.

[0063] As used in this article, “Bosein head hardness test” and “Bosein hardness test” are used interchangeably to refer to a test that measures the hardness of a material surface by indenting the surface with a diamond Bosein head. The Glassbury indenter hardness test involves indenting the outermost surface (e.g., the exposed surface) of the outer layer film of the cover plate article disclosed herein with a diamond Glassbury indenter to form an indentation depth ranging from about 50 nm to about 1000 nm (or the entire thickness of the outer or inner optical film structure, whichever is less), and measuring the maximum hardness of this indentation along the entire range of indentation depth or a segment of this indentation depth (e.g., in the range of about 100 nm to about 600 nm, about 100 nm to about 500 nm, to a depth of 200 nm, etc.), generally measured using methods described in the following literature: Oliver, WC; Pharr, GM, An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments. Journal of Materials Research, Vol. 7, No. 6, 1992, 1564-1583; and Oliver, WC; Pharr, GM. Measurement of Hardness and Elastic Modulus by Instrument Indentation: Advances in Understanding and Refinements to Methodology. *Journal of Materials Research*, Vol. 19, No. 1, 2004, 3-20. As used herein, "hardness" and "maximum hardness" can be used interchangeably to refer to the maximum hardness measured along the indentation depth, rather than the average hardness.

[0064] Typically, in nanoindentation measurement methods (such as the Glasswell indenter hardness test) used on coatings or films with a hardness greater than that of the underlying substrate, the measured hardness may appear to initially increase due to the development of a plastic zone at shallow indentation depths, then increase further and reach a maximum or stable level at deeper indentation depths. Subsequently, due to the influence of the underlying substrate, the hardness begins to decrease at even deeper indentation depths. The same effect is observed when using a substrate with a hardness higher than that of the coating; however, due to the influence of the underlying substrate, the hardness increases at deeper indentation depths. The range of indentation depths and the hardness values ​​at certain indentation depths can be selected to identify the specific hardness response of the optical film structure described herein and its individual layers, independent of the influence of the underlying substrate.

[0065] When the hardness of the outer layer film of the cover plate article of this disclosure is measured according to the Glasswell indenter hardness test, the permanent deformation zone (plastic zone) of the material is associated with the material's hardness. During indentation formation, the elastic stress field extends far beyond this permanent deformation zone. As the indentation depth increases, the apparent hardness and modulus are affected by the interaction of the stress field with the underlying substrate. The substrate's influence on hardness occurs at deeper indentation depths (i.e., typically at depths greater than about 10% of the optical film structure or layer thickness). Further, another complication is that a certain minimum load is required for the hardness response to achieve full plasticity during the indentation process. Before this specific minimum load, the hardness exhibits an overall increasing trend.

[0066] At shallow indentation depths (which can also be characterized by small loads) (e.g., up to about 50 nm), the apparent hardness of the material appears to increase sharply relative to the indentation depth. This range of shallow indentation depths does not represent a true hardness indicator but rather reflects the development of the aforementioned plastic zone, which is related to the finite radius of curvature of the indenter. At intermediate indentation depths, the apparent hardness approaches its maximum. At deeper indentation depths, the influence of the substrate becomes more pronounced with increasing indentation depth. Once the indentation depth exceeds the outer layer film of the cover plate article of this disclosure (e.g., ...), ... Figure 1-1A The hardness of the outer layer membrane 120 (shown in the diagram and discussed in detail below) can begin to decrease sharply after about 30% of its thickness is reduced.

[0067] As used herein, a "garnet scratch test" can be performed to measure the scratch resistance of transparent articles using glass-ceramic substrates and conventional transparent articles of this disclosure. The test is performed using 150-grit garnet sandpaper applied in a single pass over a contact area of ​​~0.6 x 0.6 cm with a 4 kg load. Following this scratch event, the scratch level is quantified by measuring diffuse reflection in the scratched area using a Konica-Minolta CM700D with a 6 mm diameter aperture for SCE measurement.

[0068] As used herein, the term "transmittance" is defined as the percentage of incident light power transmitted through a material (e.g., cover article, substrate, outer layer film, or portion thereof) within a given wavelength range. Similarly, the term "reflectance" is defined as the percentage of incident light power reflected from a material (e.g., cover article, substrate, or outer layer film, or portion thereof) within a given wavelength range. Transmittance and reflectance are measured using a specific linewidth. As used herein, "average transmittance" refers to the average amount of incident light power transmitted through a material within a defined wavelength range. As used herein, "average reflectance" refers to the average amount of incident light power reflected by the material.

[0069] Furthermore, the "average reflectance" can be determined within the visible spectrum, infrared spectrum, or other wavelength ranges (e.g., within the infrared spectrum from 840 nm to 950 nm) based on measurement principles understood by those skilled in the art. Unless otherwise stated, all reflectance values ​​reported or otherwise mentioned in this disclosure are associated with tests performed on the outer surface of the cover plate article and the main surface of the substrate on which the outer layer film is disposed, such as the average reflectance of the "first surface" within a specified wavelength range, the reflectance of the "first surface" at a specific wavelength, etc.

[0070] Additionally, "average transmittance" can be determined within the visible spectrum, infrared spectrum, or other wavelength ranges (e.g., the infrared spectrum from 840 nm to 950 nm, etc.) based on measurement principles understood by those skilled in the art. Unless otherwise stated, all transmittance values ​​reported or otherwise mentioned in this disclosure are associated with tests performed on the outer layer film of the substrate main surface and the cover plate article, such as "double-surface" average transmittance within a specified wavelength range, "double-surface" transmittance at a specific wavelength, etc.

[0071] As used in this article, "reflected color" refers to the color under a D65 illuminator, as indicated by CIE L. a b The color in the colorimetric system is the color reflected through the cover plate article of this disclosure. More specifically, "reflected color" can be represented by √(a 2 + b 2 ) or with a b The coordinates are given because these color coordinates are measured by the reflectivity of the D65 illuminator through the main surface of the substrate of the cover plate article within an incident angle range such as 0 to 10 degrees, 0 to 45 degrees, 0 to 90 degrees, etc.

[0072] As used herein, "chemical durability test" refers to a test used to evaluate the chemical durability of the cover plate articles of this disclosure. The chemical durability test is performed by exposing a sample of the cover plate article to an aqueous solution with or without sodium at pH 2.5 or pH 8.6 for 7 days. The sample can be tested in an undamaged state or in a 'damaged' state after being subjected to a force of 2-20 kg applied by a single-tipped diamond scribing instrument. The test is considered 'passed' if the sample does not show obvious corrosion or delamination after exposure to the solution when examined under an optical microscope at low magnification.

[0073] Aspects of the cover article of this disclosure include a durable outer layer film having discrete wavelength transmission bands (i.e., optical bandpass filters) disposed on a durable glass or glass-ceramic cover of a sensor device. It should be understood that the outer layer film can be located on an outer surface (exposed surface) or an inner surface (unexposed surface) of the glass or glass-ceramic cover of the sensor device. The bandpass filter functions by having high transmittance (>90%) for at least one, or in some embodiments, for two or three selected visible or IR wavelengths at near-normal incidence (e.g., 0-10 degrees), and lower transmittance (e.g., less than 50%, less than 30%, or less than 20%) for these same wavelengths at higher incident angles (e.g., angles greater than 20 degrees or greater than 45 degrees) (see Examples 7 and 8 below, which describe embodiments of a cover article having a single bandpass filter with a center wavelength of approximately 530 nm within a transmission bandwidth of 510 nm to 590 nm). The outer layer film may also include an easy-clean (ETC) coating. The outer layered film can exhibit durability according to many different indicators, including diffuse reflectance of less than 2% as measured by a garnet scratch test, and / or surface hardness greater than 8 GPa as measured by a Glass hardness test. Materials selected for some embodiments of the outer layered film (e.g., SiN) x SiO x N y (and SiO2) exhibit corrosion resistance and anti-delamination properties in both high and low pH media, even after severe scratching events.

[0074] More generally, the bandpass filter (i.e., cover plate article) of this disclosure can improve the sensitivity and signal-to-noise ratio performance of one or more sensors, and reduce stray light emitted from or detected by the sensor device. The sensor device may include one or more light sources and one or more detectors, with an outer layered film designed to operate at one (1), two (2), three (3), or four (4) (or even more) selected wavelengths transmitted under normal incidence. The sensor device may be a wearable electronic device such as a smartwatch, smart ring, or smart glasses. The sensing function may be a biometric sensing function, such as heart rate, ECG, body temperature, heart rate variability, respiratory rate, blood oxygen, blood pressure, or blood glucose sensing.

[0075] More specifically, the cover articles of this disclosure can have optical functionality in the form of bandpass filters, which have high transmittance for light of a specific wavelength at normal incident angles (e.g., 0-10 degrees) and lower transmittance for one or more of these same wavelengths at higher incident angles. In some embodiments, such angle-selective bandpass filters are used to improve the sensitivity and signal-to-noise ratio of single-wavelength or multi-wavelength biometric sensing systems (e.g., sensors covered and protected by cover articles). Mechanical and chemical durability is particularly important for wearable devices that may encounter abrasive particles, sweat, impact events, etc. Therefore, these bandpass filter designs (i.e., cover articles) utilize chemically strengthened glass and glass-ceramic substrates that have proven to meet the requirements of wearable electronic applications, as well as wear-resistant and chemically stable coating and film materials (such as SiN). x SiO x N y and SiO2).

[0076] The working principle of bandpass filters (i.e., cover plate articles of this disclosure) to enhance the functionality of biometric sensor systems depends on the type of sensor and the geometry of the sensing system. In one example, a bandpass filter can be used to minimize stray light reaching the detector (e.g., from the surrounding indoor environment). In another case, a bandpass filter can be used to limit the amount of stray light from an LED source that is part of the sensing system, thereby limiting visible light emission that is seen by an external observer. In yet another case, a bandpass filter can be used to enhance the detection of light transmitted and / or scattered beneath the skin surface (which is often detected at near-normal incidence) and reduce the amount of light detected reflected from the human skin surface (which may be at a higher angle depending on the relative placement of the light source and the light sensor). In different cases, if the light source and the light sensor are placed close to each other such that reflected light at normal incidence is collected by the sensor, the bandpass filter can help prevent crosstalk between broadband light detectors, or again reduce stray light from the environment reaching the detector (e.g., indoor lighting that is not part of the sensor system).

[0077] The bandpass filter (i.e., the cover plate article of this disclosure) is designed to have high transmittance at the selected sensor operating wavelength under normal incidence (0-10 degrees), and low transmittance (high reflectance) at wavelengths adjacent to the operating wavelength under normal incidence. As the angle of incidence increases, the low transmittance (high reflectance) band shifts to shorter wavelengths and is designed to begin blocking the selected sensor operating wavelength at higher angles of incidence greater than about 20 degrees. Furthermore, in some cases, the bandpass filter is designed to maintain this low transmittance (or have a low average transmittance) to the sensor operating wavelength over a wide range of angles of incidence (e.g., 20-90 degrees or 45-90 degrees). The performance of this bandpass filter also takes into account the visible reflectance color of the filter, which is important for aesthetic reasons and user acceptance in wearable device applications.

[0078] The cover plate articles of this disclosure have an outer layer film disposed on a chemically strengthened glass substrate or a glass-ceramic substrate, the outer layer film having a plurality of alternating high refractive index layers and low refractive index layers. Further, in some embodiments, the cover plate articles comprise at least two non-overlapping wavelength bands with bandwidths from 5 nm to 200 nm, each wavelength band having a center wavelength in a spectrum from 400 nm to 1200 nm (e.g., center wavelengths of 510-590 nm, 600-750 nm, and / or 800-1200 nm). (Note: In another embodiment, the cover plate articles comprise a single bandpass filter having a center wavelength of approximately 530 nm in a transmission bandwidth from 510 nm to 590 nm). Additionally, the cover plate articles exhibit that for each of these non-overlapping wavelength bands, (a) in Up to 2 The average double-surface transmittance is greater than 70% within the incident angle range, and (b) in 2 Up to 9 The average double-surface transmittance is less than 50% within the incident angle range.

[0079] Additional aspects of this disclosure include devices and systems that incorporate the cover article of this disclosure as a cover for one or more sensors. For example, such devices and systems may include smartwatches, mobile phones, camera modules (which may be located on a mobile phone), smart glasses (e.g., AR / VR glasses), and LIDAR sensing systems for distance sensing in cameras or motor vehicles. These devices or systems may also include one or more semiconductor optical light emitters or detectors made of materials comprising elements or compounds such as silicon, gallium arsenide (GaAs), germanium, indium phosphide (InP), InGaAs, GaInAsP, AlGaInAs, (Ga)InAs + quantum dots, GaInNAs (Sb), erbium, ytterbium, and neodymium-doped yttrium aluminum garnet, etc. These systems may also include display modules, such as LCD or OLED displays, integrated with or independent of one or more sensors to be protected. More generally, the cover article of this disclosure can be made or arranged in the device or system such that the cover article acts as a protective window covering more than one element mentioned herein, for example, covering one or more biometric sensors and / or other types of sensors.

[0080] Various embodiments of the cover plate article will now be described in detail, examples of which are shown in the accompanying drawings. Reference Figure 1 and 1A A cover plate article 100 according to one or more embodiments disclosed herein may include a substrate 110 and an outer layer film 120 disposed on the substrate 110. The substrate 110 may include opposing main surfaces 112, 114. The outer layer film 120... Figure 1 The outer layer 120 is shown as being disposed on the outer main surface 112; however, the outer layer 120 may be disposed on the inner main surface 114 of the substrate 110, as a supplement or alternative to that disposed on the outer main surface 112. The outer layer 120 forms the outermost surface 122. Additionally, the outer layer 120 may include a scratch-resistant layer 150 (e.g., ...). Figure 1A (As shown in the diagram). In some embodiments, the outermost surface 122 of the outer layer film 120 forms an air interface and typically defines the edge of the outer layer film 120 and the edge of the entire cover article 100. According to some embodiments, the substrate 110 may be substantially transparent, as described herein.

[0081] The outer layered film 120 comprises at least one layer of at least one material. The term "layer" may include a single layer or may include one or more sublayers. Such sublayers may be in direct contact with each other. Sublayers may be formed of the same material or two or more different materials. In one or more alternative embodiments, such sublayers may have intermediate layers of different materials disposed therebetween. In one or more embodiments, a layer may include one or more continuous and uninterrupted layers and / or one or more discontinuous and discontinuous layers (i.e., layers formed adjacent to each other with different materials). Layers or sublayers may be formed by any method known in the art, including discrete deposition processes or continuous deposition processes. In one or more embodiments, layers may be formed using only continuous deposition processes, or alternatively, using only discrete deposition processes.

[0082] The physical thickness of the outer layer membrane 120 can be about 0.25 µm or greater. In some examples, the physical thickness of the outer layer membrane 120 can be in the following ranges: about 0.25 µm to about 20 µm, about 0.25 μm to about 15 μm, about 0.25 μm to about 10 μm, about 0.25 μm to about 5 μm, about 0.5 μm to about 15 μm, about 0.5 μm to about 13 μm, about 0.5 μm to about 12 μm, about 0.5 μm to about 10 μm, about 0.5 μm to about 5 μm, about 0.5 μm to about 4 μm, and can be any thickness value between these thickness values ​​of the outer layer membrane 120. For example, the physical thickness of the outer layer membrane 120 can be approximately 0.25 μm, 0.3 μm, 0.4 μm, 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, 1 μm, 1.25 μm, 1.5 μm, 1.75 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, and all thickness values ​​between these values. As previously discussed, the outer layer membrane 120 can be located on the outer surface 112 (exposed surface) or inner surface 114 (non-exposed surface) of the glass or glass-ceramic cover plate 110 of the sensor device 200, 300.

[0083] For example Figure 1 and 1AAs shown, the outer layered film 120 includes multiple layers (130A, 130B). In one or more embodiments, the outer layered film 120 may include a period 132 comprising two or more layers. In one or more embodiments, the two or more layers may be characterized by having different refractive indices from each other. In one embodiment, the period 132 includes a first low-RI layer 130A and a second high-RI layer 130B. The refractive index difference between the first low-RI layer 130A and the second high-RI layer 130B may be about 0.01 or greater, about 0.05 or greater, about 0.1 or greater, or even about 0.2 or greater.

[0084] like Figure 1 and 1A As shown, the outer layer 120 may include multiple periods 132. A single period 132 may include a first low-RI layer 130A and a second high-RI layer 130B, such that when multiple periods 132 are provided, the first low-RI layer 130A (designated "L" for illustration) and the second high-RI layer 130B (designated "H" for illustration) alternate in the following layer order: L / H / L / H or H / L / H / L, such that the first low-RI layer 130A and the second high-RI layer 130B alternate along the physical thickness of the outer layer 120. Figure 1 and 1A In the example, the outer layer membrane 120 includes fifteen (15) cycles 132, each cycle including a low RI layer 130A and a high RI layer 130B. In some embodiments, the outer layer membrane 120 may include up to one hundred (100) cycles 132 (also referred to herein as “N” cycles, where N is an integer). For example, the outer layer membrane 120 may include about 10 to about 100 cycles 132, about 10 to about 90 cycles 132, about 10 to about 80 cycles 132, about 10 to about 70 cycles 132, about 10 to about 60 cycles 132, about 10 to about 50 cycles 132, about 15 to about 100 cycles 132, about 15 to about 90 cycles 132, about 15 to about 80 cycles 132, about 15 to about 70 cycles 132, about 15 to about 60 cycles 132, about 15 to about 50 cycles 132, about 20 to about 40 cycles 132, or any other number of cycles 132 within these ranges. For example, the outer layer membrane 120 may include 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100 periods 132 or any number of periods 132 between these values.

[0085] In some embodiments of the cover plate article 100 of this disclosure, the outer layer film 120 includes a plurality of periods 132 such that the film 120 comprises alternating high refractive index layers and low refractive index layers 130A and 130B, said high refractive index layers and low refractive index layers totaling at least 22, 24, 26, 28, 30 or more layers. In some embodiments, the outer layer film 120 includes more than five (5), more than ten (10), more than twelve (12) or more than fifteen (15) high refractive index layers 130B, wherein the physical thickness of each layer is greater than 100 nm.

[0086] exist Figure 1 and 1A In the illustrated embodiment, the outer layer 120 may include an additional capping layer 131, which may include a material with a refractive index lower than that of the second high-RI layer 130B. In this embodiment, one of the low-refractive-index layers 130A of the outer layer 120 is the capping layer 131 (e.g., as shown in the original text). Figure 1 and 1A (As shown).

[0087] As used herein, the terms "low RI" and "high RI" refer to the relative values ​​of the refractive indices of layers 130A and 130B with respect to each other (e.g., low RI < high RI). In one or more embodiments, the term "low RI" when used for low RI layer 130A includes a range of about 1.3 to about 1.7 or 1.75. In one or more embodiments, the term "high RI" when used for high RI layer 130B includes a range of about 1.7 to about 2.6 (e.g., about 1.85 or greater).

[0088] Suitable materials for the outer layer membrane 120 include: SiO2, Al2O3, GeO2, SiO, AlO x N y AlN, SiN x SiO x N y Si u Al v O x N yThe following are listed as suitable materials for scratch-resistant layers, including Ta2O5, Nb2O5, TiO2, ZrO2, TiN, MgO, MgF2, BaF2, CaF2, SnO2, HfO2, Y2O3, MoO3, DyF3, YbF3, YF3, CeF3, polymers, fluoropolymers, plasma-polymerized polymers, siloxane polymers, silsesquioxanes, polyimides, fluorinated polyimides, polyetherimides, polyethersulfone, polyphenylsulfone, polycarbonate, polyethylene terephthalate, polyethylene naphthalate, acrylic polymers, urethane polymers, polymethyl methacrylate, and others, as well as other materials known in the art. Some examples of materials suitable for use in low-RI layers 130A include SiO2, Al2O3, GeO2, SiO, AlO x N y SiO x N y Si u Al v O x N y Materials suitable for the first low-RI layer include MgO, MgAl2O4, MgF2, BaF2, CaF2, DyF3, YbF3, YF3, and CeF3. Materials with minimized nitrogen content (e.g., in materials such as Al2O3 and MgAl2O4) can be used. Some examples of materials suitable for the high-RI layer 130B include Si. u Al v O x N y , Ta2O5, Nb2O5, AlN, Si3N4, AlO x N y SiO x N y SiN x SiN x :H y HfO2, TiO2, ZrO2, Y2O3, Al2O3, MoO3 and diamond-like carbon.

[0089] In the example, the high RI layer 130B can also be a high hardness layer or a scratch-resistant layer (e.g.) Figure 1A The scratch-resistant layer 150 shown above, and the high-RI materials listed above may also include high hardness or scratch resistance. In some embodiments, the oxygen content of the materials of the high-RI layer 130B and / or the scratch-resistant layer 150 can be minimized, especially in SiN. x or AlN x In other embodiments, the high-RI layer 130B and / or the scratch-resistant layer 150 each comprise SiN. x or SiO x N yIn some embodiments, AlO x N y The material can be considered as oxygen-doped AlN x In other words, these oxygen-doped AlN x Materials can have AlN x Crystal structure (e.g., wurtzite), without necessarily having an AlON crystal structure.

[0090] The hardness of the high-RI layer 130B and / or the scratch-resistant layer 150 can be specifically characterized. In some embodiments, such as by measuring the hardness of a Glassfield indenter at an indentation depth of about 100 nm or greater, the maximum hardness of the high-RI layer 130B and / or the scratch-resistant layer 150 can be about 8 GPa or greater, about 10 GPa or greater, about 12 GPa or greater, about 15 GPa or greater, about 18 GPa or greater, or about 20 GPa or greater. In some cases, the high-RI layer 130B material can be deposited as a monolayer and can be characterized as a scratch-resistant layer (e.g., scratch-resistant layer 150), and the thickness of this monolayer can be between about 200 nm and 10,000 nm for repeatable hardness measurements. In other embodiments where the high RI layer 130B is deposited as a single layer (e.g., as a scratch-resistant layer 150), the physical thickness of this layer can be about 200 nm to about 10,000 nm, about 200 nm to about 5,000 nm, about 500 nm to about 5,000 nm, about 1,000 nm to about 4,000 nm, about 1,500 nm to about 4,000 nm, about 1,500 nm to about 3,000 nm, and all thickness values ​​between these thicknesses.

[0091] In one or more embodiments, one or more of the low-RI layer 130A and high-RI layer 130B of the outer layer film 120 may include a specific range of physical thicknesses. These layers 130A and / or 130B of the outer layer film 120 may include physical thicknesses within the ranges of: about 1 nm to about 400 nm, about 5 nm to about 300 nm, about 5 nm to about 200 nm, about 10 nm to about 200 nm, or about 10 nm to about 250 nm. In some embodiments, all or most of the layers of the outer layer film 120 may each have a physical thickness within the ranges of: about 1 nm to about 400 nm, about 5 nm to about 300 nm, about 5 nm to about 200 nm, about 10 nm to about 200 nm, or about 10 nm to about 250 nm. In some embodiments, the physical thickness of the outermost high-refractive-index layer 130B of the cover plate article 100 is greater than 150 nm, greater than 200 nm, or even greater than 225 nm. In other embodiments of the cover plate article 100, the outermost physical thickness of the outer layer film 120 is greater than 50%, greater than 55%, or even greater than 60% and contains a high refractive index material, i.e., the material of the high RI layer 130B.

[0092] In one or more embodiments, one or more layers of the outer layered film 120 may include a specific range of optical thicknesses. As used herein, the term "optical thickness" refers to the thickness of the layer (the physical thickness of the layer). d ) and refractive index ( nThe product of the two layers is determined. In one or more embodiments, at least one layer of the outer layered film 120 (e.g., one or more of the low RI layer 130A and the high RI layer 130B) may include an optical thickness in the range of: about 2 nm to about 200 nm, about 10 nm to about 100 nm, about 15 nm to about 100 nm, about 15 nm to about 500 nm, or about 15 nm to about 5000 nm. In some embodiments, all layers of the outer layered film 120 may each have an optical thickness in the range of: about 2 nm to about 200 nm, about 10 nm to about 100 nm, about 15 nm to about 100 nm, about 15 nm to about 500 nm, or about 15 nm to about 5000 nm. In some cases, the optical thickness of at least one layer of the outer layered film 120 is about 50 nm or greater. In some cases, each low-RI layer in the low-RI layer 130A has an optical thickness in the range of about 2 nm to about 200 nm, about 10 nm to about 100 nm, about 15 nm to about 100 nm, about 15 nm to about 500 nm, or about 15 nm to about 5000 nm. In other cases, each high-RI layer in the high-RI layer 130B has an optical thickness in the range of about 2 nm to about 200 nm, about 10 nm to about 100 nm, about 15 nm to about 100 nm, about 15 nm to about 500 nm, or about 15 nm to about 5000 nm.

[0093] In some embodiments, the topmost air-side layer of the outer layer 120 may comprise a high-RI layer 130B (not shown), which also exhibits high hardness. In some embodiments, an additional coating (not shown) may be applied on top of this topmost air-side high-RI layer 130B or capping layer 131 (e.g., the additional coating may include a low-friction coating, an oleophobic coating, or an easy-to-clean coating). When a low-RI layer 130A and / or capping layer 131 with a very low thickness (e.g., about 10 nm or less, about 5 nm or less, or about 2 nm or less) is added to the topmost air-side layer comprising the high-RI layer 130B, the addition has minimal impact on optical performance. The low-RI layer 130A with a very low thickness may comprise SiO2, an oleophobic or low-friction layer, or a combination of SiO2 and an oleophobic material. An exemplary low-friction layer may comprise diamond-like carbon. Such materials (or one or more layers of the outer layer 120) may exhibit a coefficient of friction of less than 0.4, less than 0.3, less than 0.2, or even less than 0.1.

[0094] In one or more embodiments, the combined physical thickness of the high RI layer 130B can be characterized. For example, in some embodiments, the combined thickness of the high RI layer 130B can be about 100 nm or greater, about 150 nm or greater, about 200 nm or greater, about 250 nm or greater, about 300 nm or greater, about 350 nm or greater, about 400 nm or greater, about 450 nm or greater, about 500 nm or greater, about 550 nm or greater, about 600 nm or greater, about 650 nm or greater, about 700 nm or greater, about 750 nm or greater, about 800 nm or greater, about 850 nm or greater, about 900 nm or greater, about 950 nm or greater, about 1000 nm or greater, about 1500 nm or greater, about 2000 nm or greater, about 2500 nm or greater, about 3000 nm or greater, about 4000 nm or greater, about 5000 nm or greater, about 7500 nm or greater, about 10000 nm or greater. nm or greater, and all combinations of thicknesses and thickness ranges within the aforementioned range. The combined thickness is the calculated combination of the thicknesses of the individual high-RI layers 130B in the outer layered film 120, even when an intermediate low-RI layer 130A or other layers are present. In some embodiments, the combined physical thickness of the high-RI layers 130B can be greater than 30% of the total physical thickness of the outer layered film 120, and the high-RI layers can also comprise high-hardness materials (e.g., nitrides or oxynitrides). For example, the combined physical thickness of the high-RI layers 130B can be approximately 25% or greater, 30% or greater, 35% or greater, 40% or greater, approximately 50% or greater, or even approximately 60% or greater of the total physical thickness of the outer layered film 120.

[0095] The cover article 100 may include one or more additional coatings disposed on the outer layer film 120. In one or more embodiments, the additional coatings may include an easy-to-clean coating. Examples of suitable easy-to-clean coatings are described in U.S. Patent Application No. 13 / 690,904, filed November 30, 2012, entitled “Process for Making of Glass Articles with Optical and Easy-to-Clean Coatings,” which was published April 24, 2014, under U.S. Patent Application Publication No. 2014 / 0113083, and a substantial portion of that application is incorporated herein by reference in its entirety. The easy-to-clean coating may have a thickness in the range of about 5 nm to about 50 nm and may include known materials, such as fluorinated silanes. The easy-to-clean coating may alternatively or additionally include a low-friction coating or surface treatment. Exemplary low-friction coating materials may include diamond-like carbon, silanes (e.g., fluorosilanes), phosphonates, olefins, and alkynes. In some embodiments, the easy-clean coating may have a thickness in the following ranges: about 1 nm to about 40 nm, about 1 nm to about 30 nm, about 1 nm to about 25 nm, about 1 nm to about 20 nm, about 1 nm to about 15 nm, about 1 nm to about 10 nm, about 5 nm to about 50 nm, about 10 nm to about 50 nm, about 15 nm to about 50 nm, about 7 nm to about 20 nm, about 7 nm to about 15 nm, about 7 nm to about 12 nm, or about 7 nm to about 10 nm, and all ranges and subranges therein.

[0096] The additional coating may include one or more scratch-resistant layers (e.g., with a composition similar to scratch-resistant layer 150). In some embodiments, the additional coating includes a combination of an easy-clean material and a scratch-resistant material. In one example, the combination includes an easy-clean material and diamond-like carbon. The thickness of such an additional coating may range from about 5 nm to about 20 nm. The components of the additional coating may be provided in separate layers. For example, diamond-like carbon may be disposed as a first layer, and an easy-clean material may be disposed on the first layer of diamond-like carbon as a second layer. The thicknesses of the first and second layers may be within the ranges provided above for the additional coating. For example, the thickness of the first layer of diamond-like carbon may be from about 1 nm to about 20 nm or from about 4 nm to about 15 nm (or more specifically, about 10 nm), and the thickness of the second layer of easy-clean material may be from about 1 nm to about 10 nm (or more specifically, about 6 nm). The diamond-like coating may include tetrahedral amorphous carbon (Ta-C), Ta-C:H, and / or aCH.

[0097] As mentioned in this article, Figure 1A The outer layer 120 of the cover plate article 100 depicted includes a scratch-resistant layer 150, which can be disposed within the outer layer 120 (e.g., Figure 1A As shown in the figure, the outer layer 120 is directly disposed on the substrate 110 (not shown) or on the outermost surface 122 of the outer layer 120 (not shown). In some embodiments, the scratch-resistant layer 150 may be disposed between the layers of the outer layer 120, such that a portion of the outer layer 120 is above the scratch-resistant layer 150 (e.g., an anti-reflection region), while another portion of the outer layer 120 is below the layer 150 and above the substrate 110. In an embodiment, the portion of the outer layer 120 below the layer 150 acts as an optical interference layer or region, which may serve to bridge the refractive index difference between the substrate 110 and the scratch-resistant layer 150, and comprises alternating high-refractive-index layers 130B and low-refractive-index layers 130A. The two sections of the outer layer 120 (i.e., the optical interference region disposed between the scratch-resistant layer 150 and the substrate 110 and the anti-reflection region disposed on the scratch-resistant layer 150) may have different thicknesses or may have substantially the same thickness. The layers of the two segments of the outer layered membrane 120 may be identical or different from each other in composition, order, thickness and / or arrangement. In addition, the layers of the two segments of the outer layered membrane 120 may contain the same number of periods 132 (N), or the number of periods 132 in each segment may be different from each other.

[0098] Exemplary materials used in the scratch-resistant layer 150 (or as an additional coating, as previously mentioned) may include inorganic carbides, nitrides, oxides, diamond-like materials, or combinations thereof. Examples of materials suitable for the scratch-resistant layer 150 include metal oxides, metal nitrides, metal oxynitrides, metal carbides, metal carbon oxides, and / or combinations thereof. Exemplary metals include B, Al, Si, Ti, V, Cr, Y, Zr, Nb, Mo, Sn, Hf, Ta, and W. Specific examples of materials that may be used for the scratch-resistant layer 150 or coating may include Al₂O₃, AlN, AlO₂ x N y Si3N4, SiN x SiO x N y Si u Al v O x N y Diamond, diamond-like carbon, Si x C y Si x O y C z ZrO2, TiO x Ny And in combination with thereof. The scratch-resistant layer 150 may also comprise nanocomposite materials or materials with controlled microstructures to improve hardness, toughness, or wear / abrasion resistance. For example, the scratch-resistant layer 150 may comprise nanocrystals with sizes ranging from about 5 nm to about 30 nm. In embodiments, the scratch-resistant layer 150 may comprise transformation-toughened zirconia, partially stabilized zirconia, or zirconia-toughened alumina. In embodiments, the scratch-resistant layer 150 exhibits a fracture toughness value greater than about 1 MPa√m and simultaneously exhibits a hardness value greater than about 8 GPa.

[0099] The scratch-resistant layer 150 may include a single layer (such as...) Figure 1A (as shown in the diagram), or multiple sublayers or a single layer exhibiting a refractive index gradient. When using multiple layers, such layers form a scratch-resistant coating. For example, scratch-resistant layer 150 may include Si. u Al v O x N y A compositional gradient, wherein the concentrations of any one or more of Si, Al, O, and N are varied to increase or decrease the refractive index. A refractive index gradient can also be formed using porosity. Such a gradient is more fully described in U.S. Patent Application No. 14 / 262,224, filed April 25, 2014, entitled “Scratch-Resistant Articles with a Gradient Layer,” now issued July 11, 2017, under U.S. Patent No. 9,703,011, the substantial portions of which are hereby incorporated by reference in their entirety.

[0100] According to some embodiments, the physical thickness of the scratch-resistant layer 150 can be from about 100 nm to about 5000 nm. In some embodiments, the physical thickness of the scratch-resistant layer 150 is about 100 nm to about 10000 nm, about 200 nm to about 7500 nm, about 200 nm to about 5000 nm, about 200 nm to about 3000 nm, about 500 nm to about 5000 nm, about 500 nm to about 3000 nm, about 500 nm to about 2500 nm, about 1000 nm to about 4000 nm, about 1500 nm to about 4000 nm, about 1500 nm to about 3000 nm, and all thickness values ​​between these thicknesses. For example, the physical thickness of the scratch-resistant layer 150 can be 100 nm, 150 nm, 200 nm, 300 nm, 400 nm, 500 nm, 600 nm, 700 nm, 800 nm, 900 nm, 1000 nm, 1100 nm, 1200 nm, 1300 nm, 1400 nm, 1500 nm, 1600 nm, 1700 nm, 1800 nm, 1900 nm, 2000 nm, 2100 nm, 2200 nm, 2300 nm, 2400 nm, 2500 nm, 2600 nm, 2700 nm, 2800 nm, 2900 nm, 3000 nm, 3500 nm, 4000 nm, 4500 nm, 5000 nm, 7500 nm, 10000 nm, and all sub-ranges and values ​​of thickness between the aforementioned thicknesses.

[0101] In one exemplary embodiment of the cover plate article 100 disclosed herein, such as Figure 1A The depicted outer layer 120 may include a scratch-resistant layer 150 having the same composition as the high-RI layer 130B, and a capping layer 131 positioned above the scratch-resistant layer 150, wherein the capping layer 131 comprises a low-RI material. The scratch-resistant layer 150 may alternatively be defined as the thickest hard layer or the thickest high-RI layer 130B in the entire outer layer 120 or the entire cover article 100. Without being bound by theory, it is considered that when a relatively small amount of material (e.g., a single capping layer 131) is deposited on the scratch-resistant layer 150 (e.g., as...), Figure 1A As shown, the cover plate article 100 can exhibit increased hardness at the indentation depth. However, including multiple low-RI layers 130A and high-RI layers 130B above the scratch-resistant layer 150 can also enhance the optical properties of the cover plate article 100.

[0102] exist Figure 1AIn some embodiments of the cover plate article 100, a relatively small number of layers (e.g., only 1, 2, 3, 4, or 5 layers) may be positioned over the scratch-resistant layer 150 in the outer layered film 120, and these layers may each be relatively thin (e.g., less than 100 nm, less than 75 nm, less than 50 nm, or even less than 25 nm). In other embodiments, a larger number of layers (e.g., 3 to 15 layers) may be positioned over the scratch-resistant layer 150 in the outer layered film 120, and each of these layers may also be relatively thin (e.g., less than 200 nm, less than 175 nm, less than 150 nm, less than 125 nm, less than 100 nm, less than 75 nm, less than 50 nm, and even less than 25 nm).

[0103] In one implementation scheme, Figure 1 An exemplary cover article 100 is depicted having an outer layer film 120 located on a substrate 110, the outer layer film comprising fifteen (15) periods 132 and a capping layer 131. In this exemplary arrangement, the outer layer film 120 is configured such that each period 132 includes a low RI layer 130A and a high RI layer 130B, wherein the first low RI layer 130A is disposed directly on the outer main surface 112 of the substrate 110. Further, the outer layer film 120 includes a capping layer 131 disposed on the outermost high RI layer 130B, wherein the capping layer 131 defines the outermost surface 122 of the outer layer film 120. Thus, in this configuration, the outer layer film 120 comprises a total of thirty-one (31) layers. In other exemplary configurations of the cover article 100, the outer layer film 120 includes a capping layer 131 and a total of twenty-seven (27), thirty (30), or thirty-four (34) cycles 132, thus having a total of 55, 61, and 69 layers.

[0104] In another implementation, Figure 1AAn exemplary cover article 100 is depicted having an outer layer film 120 located on a substrate 110, the outer layer film comprising fifteen (15) periods 132, a scratch-resistant layer 150, and a capping layer 131. In this exemplary arrangement, the outer layer film 120 is configured such that each period 132 includes a low RI layer 130A and a high RI layer 130B or a scratch-resistant layer 150, wherein the first low RI layer 130A is disposed directly on the outer main surface 112 of the substrate 110. Further, the outer layer film 120 includes a capping layer 131 disposed on the outermost high RI layer 130B / scratch-resistant layer 150, wherein the capping layer 131 defines the outermost surface 122 of the outer layer film 120. Thus, in this configuration, the outer layer film 120 comprises a total of thirty-one (31) layers. In another exemplary configuration of the cover article 100, the outer layer film 120 includes a scratch-resistant layer 150 (which is also considered a high-RI layer 130B due to its high refractive index), a capping layer 131, and a total of thirty-five (35) cycles 132, thus having a total of 71 layers.

[0105] According to such Figure 1-1A An embodiment of the cover article 100, depicted in exemplary form, can achieve an excellent combination of high transmittance in two or more wavelengths or wavelength bands within the 400 nm to 1200 nm spectrum and advantageous mechanical properties (e.g., high scratch resistance, hardness, abrasion resistance, and / or chemical durability) through certain structural features in the outer layer film 120. These structural features of the outer layer film 120 include, but are not limited to: a relatively high number of periods 132 (e.g., N = 15 to 100); a low refractive index layer 130A comprising oxide in direct contact with the substrate 110; an outermost capping layer 131 comprising oxide; a relatively thick scratch-resistant layer 150 disposed below the capping layer 131; and alternating low RI layers 130A and high RI layers 130B.

[0106] According to such Figure 1-1AIn some embodiments of the cover article 100 depicted in exemplary form, the outer layer film 120 may be configured such that the capping layer 131 is configured such that its thickness is 5 nm to 150 nm, 10 nm to 150 nm, 15 nm to 150 nm, 15 nm to 125 nm, and all thickness values ​​and ranges within the aforementioned ranges. For example, the thickness of the capping layer 131 may be 5 nm, 10 nm, 15 nm, 20 nm, 25 nm, 30 nm, 35 nm, 40 nm, 45 nm, 50 nm, 60 nm, 70 nm, 80 nm, 90 nm, 100 nm, 110 nm, 120 nm, 130 nm, 140 nm, 150 nm, and all thicknesses between these values. In other embodiments, the outer layer film 120 is configured such that the thickness of the capping layer 131 is at least 110 nm, 120 nm, 130 nm, 140 nm, or even 150 nm. In some embodiments of the cover article 100, the thickness of the capping layer 131 is about 110 nm to about 200 nm, about 110 nm to about 175 nm, or about 110 nm to about 150 nm. For example, the thickness of the capping layer 131 can be about 110 nm, 115 nm, 120 nm, 125 nm, 130 nm, 140 nm, 150 nm, 160 nm, 170 nm, 180 nm, 190 nm, 200 nm, and all thickness values ​​between the aforementioned ranges and subranges.

[0107] According to such Figure 1-1A In some embodiments of the cover article 100 depicted in exemplary form, the outer layer film 120 may be configured such that the thickness of the first low RI layer 130A disposed in contact with the outer main surface 122 of the substrate 110 is 5 nm to 75 nm, 5 nm to 65 nm, 5 nm to 60 nm, 5 nm to 50 nm, 10 nm to 75 nm, 10 nm to 65 nm, 10 nm to 60 nm, 10 nm to 50 nm, 15 nm to 75 nm, 15 nm to 65 nm, 15 nm to 60 nm, 15 nm to 50 nm, and all thickness values ​​and thickness ranges within the aforementioned ranges. For example, the thickness of the first low RI layer 130A can be 5 nm, 7.5 nm, 10 nm, 12.5 nm, 15 nm, 17.5 nm, 20 nm, 22.5 nm, 25 nm, 27.5 nm, 30 nm, 35 nm, 40 nm, 45 nm, 50 nm, 55 nm, 60 nm, 65 nm, 70 nm, 75 nm, and all thicknesses between these values.

[0108] The outer layer film 120 and / or cover plate article 100 can be described based on the hardness measured by a Glassburn indenter hardness test. As previously mentioned, the Glassburn indenter hardness test involves indenting the outermost surface 122 of the cover plate article 100 with a diamond Glassburn indenter (see...). Figure 1-1A The surface of any one or more layers of the outer layer film 120 is used to form an indentation with a depth ranging from about 50 nm to about 1000 nm (or the entire thickness of the outer layer film 120 or its layers, whichever is less) or from about 100 nm to about 500 nm, and the maximum hardness of this indentation is measured along the entire range of indentation depth or a segment of this indentation depth (e.g., at an indentation depth of 100 nm or greater, in the range of about 100 nm to about 250 nm, etc.).

[0109] In some embodiments, when measured at the outermost surface 122, the cover plate article 100 (e.g., as...) Figure 1-1A The hardness (as depicted in the text) can be approximately 8 GPa or greater, approximately 10 GPa or greater, or approximately 12 GPa or greater (e.g., approximately 14 GPa or greater, approximately 16 GPa or greater, approximately 18 GPa or greater, or approximately 20 GPa or greater). The hardness of the cover plate article 100 can even be up to approximately 20 GPa or 30 GPa. The outer layer film 120 and / or cover plate article 100 can exhibit such measured hardness values ​​along an indentation depth of about 50 nm or greater, or about 100 nm or greater (e.g., about 50 nm to about 300 nm, about 50 nm to about 400 nm, about 50 nm to about 500 nm, about 50 nm to about 600 nm, about 100 nm to about 300 nm, about 100 nm to about 400 nm, about 100 nm to about 500 nm, or about 100 nm to about 600 nm, about 200 nm to about 300 nm, about 200 nm to about 400 nm, about 200 nm to about 500 nm, or about 200 nm to about 600 nm). Such hardness values ​​can also be measured from the outermost surface 122 of the outer layer film 120 to a depth of 200 nm. In one or more embodiments, the cover plate article 100 exhibits a harderness than the substrate 110 (which can be measured on the opposite surface of the outermost surface 122, such as the inner main surface 114).

[0110] According to another implementation scheme, based on information and speculation, cover plate product 100 (e.g., such as...) Figure 1 , 1AThe outer surface 122 of the outer layer film 120, after being subjected to a garnet scratch test, exhibits a diffuse reflectance (i.e., SCE value) of less than 2%, less than 1.5%, less than 1%, or even less than 0.5% in the tested scratch area. For example, the cover plate 100 may exhibit diffuse reflectance (SCE) values ​​of 1.9%, 1.75%, 1.5%, 1.25%, 1%, 0.75%, 0.5%, and 0.25%, as well as other diffuse reflectance values ​​less than 0.1%, after being subjected to a garnet scratch test.

[0111] According to another embodiment, cover plate article 100 (e.g., such as...) Figure 1 , 1A The described embodiment of the cover plate article 100, when exposed to a chemical durability test using an aqueous solution (containing sodium or without sodium) at pH 2.5 or pH 8.6 in an undamaged state for at least 1 day, 2 days, 3 days, 5 days, 7 days, or even 10 days, showed no failure. Furthermore, the embodiment of the cover plate article 100, when exposed to a chemical durability test using an aqueous solution (containing sodium or without sodium) at pH 2.5 or pH 8.6 in a damaged state (i.e., before the durability test, the outer layer membrane 120 is subjected to a force of 2-20 kg from a single-tipped diamond scribing instrument), showed no failure after at least 1 day, 2 days, 3 days, 5 days, 7 days, or even 10 days.

[0112] According to such Figure 1-1A An embodiment of the cover article 100 of the present disclosure, depicted in exemplary form, has at least two non-overlapping wavelength bands with bandwidths from 5 nm to 200 nm, each wavelength band having a center wavelength in the spectrum from 400 nm to 1200 nm, and the cover article exhibits that, for each of the non-overlapping wavelength bands, (a) in Up to 2 or Up to 1 The average double-surface transmittance is greater than 70%, 75%, 80%, 85%, 90%, or 92% within the incident angle range, and (b) in 2 Up to 9 3 Up to 9 4 Up to 9 Or 5 Up to 9 The average double-surface transmittance is less than 50%, less than 40%, less than 30%, less than 20%, less than 15%, less than 12%, or less than 10% within the incident angle range. For example, in an embodiment, the cover plate article 100 may exhibit: for each of the non-overlapping wavelength bands, (a) in Up to 2 or Up to 1 The average double-surface average transmittance at 75%, 80%, 85%, 90%, or even 95% within the incident angle range, and (b) at 2 Up to 9 The average bisurface transmittance is 45%, 40%, 35%, 30%, 25%, 20%, 15%, 10%, or even 5% within the incident angle range. In some embodiments, the cover article 100 has two (2) or three (3) non-overlapping wavelength bands (e.g., bandwidths of 5-200 nm, 5-150 nm, etc.), with the center wavelength of each wavelength band in the spectrum of 400 nm to 1200 nm (e.g., center wavelengths of 450-590 nm, 510-590 nm (green / yellow), 600-750 nm (red), and / or 800-1200 nm (infrared)). According to some embodiments, the outer layer film 120 of the cover plate article 100 is configured such that at least two non-overlapping wavelength bands are discrete, centered on a specific center wavelength for sensor operation, said center wavelength being in the range of 200 to 2400 nm or 400 nm to 1200 nm, including but not limited to: 355 nm, 460 nm, 465 nm, 470 nm, 480 nm, 505 nm, 515 nm, 520 nm, 525 nm, 530 nm, 560 nm, 570 nm, 575 nm, 590 nm, 595 nm, 615 nm, 630 nm, 635 nm, 640 nm, 650 nm, 660 nm, 730 nm, 800 nm, 805 nm, 810 nm, 825 nm, 850 nm, 870 nm, 880 nm, 930 nm, 940 nm, 950 nm, and other wavelengths known and demonstrated in the field of PPG sensors. Example center wavelengths for LED emission, laser emission, or sensor detection in PPG systems can be found in the following references: Ray, D., Collins, T., Woolley, S., and Ponnapalli, P., “A review of wearable multi-wavelength photoplethysmography”, IEEE Reviews in Biomedical Engineering, 2021. The high average transmittance values ​​cited herein are typically for embodiments with a cover glass and a multilayer film-coated surface only. In other embodiments, the second surface of the cover glass may be coated with an anti-reflective coating, which can help achieve average normal incident transmittance exceeding 93%, 94%, 95%, or even greater than 96%.

[0113] According to one embodiment, such as Figure 1 The cover article 100, depicted in an exemplary form, exhibits performance at 525 nm. Up to 2 Within the incident angle range and at 690 nm and 940 nm Up to 3 The bisurface transmittance is greater than 90% over the incident angle range. In this embodiment, at 525 nm for 3 Up to 9 The range of incident angles and for 4 at 690 nm and 940 nm Up to 9 Within the incident angle range, the average double-surface transmittance drops to below 15%.

[0114] According to one embodiment, such as Figure 1 The cover article 100, depicted in an exemplary form, exhibits performance at 525 nm. Up to 2 Within the incident angle range and at 690 nm and 940 nm Up to 3 The bisurface transmittance is greater than 85% over the incident angle range. In this embodiment, at 525 nm for 3 Up to 5 For most or all angles within the incident angle range, the average bisurface transmittance drops below 50%, and at 690 nm and 940 nm for 4 Up to 9 Within the incident angle range, the average double-surface transmittance drops to below 25%.

[0115] According to one embodiment, such as Figure 1 The cover article 100, depicted in exemplary form, exhibits performance at 525 nm and 690 nm. Up to 1 Within the incident angle range and at 940 nm Up to 2 The dual-surface transmittance is greater than 90% over the incident angle range. In this embodiment, for 2 at 525 nm and 690 nm... Up to 9 Or 4 Up to 9 Most or all of the angles within the incident angle range and for 5 at 940 nm Up to 9 Within the incident angle range, the average double-surface transmittance drops to below 30%.

[0116] According to such Figure 1 , 1ASome embodiments of the cover article 100 of this disclosure, depicted in exemplary form, further exhibit at selected operating wavelengths (e.g., 525 nm, 690 nm, and 940 nm) within the spectrum of 400 nm to 1200 nm, with a wavelength greater than or equal to 2 At one or more incident angles (e.g., at 2) Up to 9 Within a selected angle or range of angles, for example, 2 Up to 6 3 Up to 6 4 Up to 6 5 Up to 6 2 Up to 7 3 Up to 7 4 Up to 7 5 Up to 7 2 up to 8 3 up to 8 4 up to 8 5 up to 8 2 up to 8 3 up to 8 4 up to 8 5 up to 8 6 up to 8 2 Up to 9 3 Up to 9 4 Up to 9 5 Up to 9 Or 6 Up to 9 The double-surface transmittance is less than 50%, less than 40%, less than 30%, less than 20%, or less than 10% (which may be the average transmittance averaged over a specific angular range (as listed above)) (and / or greater than 50%, 60%, 70%, 80%, or 90%). For example, the cover plate article 100 may exhibit a high reflectance at any wavelength (e.g., 525 nm, 690 nm, and 940 nm) within a selected operating wavelength range of 400 nm to 1200 nm. Up to 9 Bisurface transmittance at one or more incident angles of 45%, 40%, 35%, 30%, 25%, 20%, 15%, 10%, and 5%, and all transmittance values ​​between these levels.

[0117] According to such Figure 1 , 1A An embodiment of the cover article 100 of this disclosure, depicted in exemplary form, can exhibit one or more of the following bisurface reflective colors (CIE 1964 coordinates) under illumination from a D65 illuminator: (a) in Up to 1 At all near-normal angles of incidence, such as through a > 10, > 15 or > 20 give a red or slightly reddish hue; (b) in 0 to 1 At all near-normal angles of incidence, such as through a < +5, < 0 or -60 < a < 0 (or for 0 to 9) All angles of incidence, a < +5) gives a blue-green or light blue-green hue; and (c) in Up to 9 At all incident angles, such as through -20 < a < +10, -15 < a < +5, -10 < a < +2 or -6 < a < +1, and -20 < b < +20, -15 < b < +15, -10 < b < +10 or -6 < b < +6 (or in Up to 1 At all near-normal incident angles, a and b The neutral or silver hues are given for -10 to +10, -4 to +4, -2 to +2, or even -1 to +1.

[0118] Substrate 110 may include inorganic materials and may include amorphous substrates, crystalline substrates, or combinations thereof. Substrate 110 may be formed from man-made materials and / or naturally occurring materials (e.g., quartz and polymers). For example, in some cases, substrate 110 may be characterized as organic, and specifically, may be a polymer. Examples of suitable polymers include, but are not limited to: thermoplastics, including polystyrene (PS) (including styrene copolymers and blends); polycarbonate (PC) (including copolymers and blends); polyesters (including copolymers and blends, including polyethylene terephthalate and polyethylene terephthalate copolymers); polyolefins (PO) and cyclic polyolefins (cyclic PO); polyvinyl chloride (PVC); acrylic polymers, including polymethyl methacrylate (PMMA) (including copolymers and blends); thermoplastic polyurethane (TPU); polyetherimide (PEI); and blends of these polymers with each other. Other exemplary polymers include epoxy resins, styrene resins, phenolic resins, melamine resins, and silicone resins.

[0119] In some specific embodiments, substrate 110 may specifically exclude polymeric materials, plastics, and / or metallic materials. Substrate 110 may be characterized as an alkali metal-containing substrate (i.e., substrate 110 comprises one or more alkali metals). In one or more embodiments, substrate 110 exhibits a refractive index in the range of about 1.45 to about 1.55. In specific embodiments, those skilled in the art of this disclosure will understand that, as measured using ball-on-ring testing, using at least 5, at least 10, at least 15, or at least 20 samples, substrate 110 may exhibit an average strain-to-failure rate of 0.5% or greater, 0.6% or greater, 0.7% or greater, 0.8% or greater, 0.9% or greater, 1% or greater, 1.1% or greater, 1.2% or greater, 1.3% or greater, 1.4% or greater, 1.5% or greater, or even 2% or greater at one or more surfaces on opposite main surfaces. In a particular embodiment, the substrate 110 may exhibit an average fracture strain rate of about 1.2%, about 1.4%, about 1.6%, about 1.8%, about 2.2%, about 2.4%, about 2.6%, about 2.8%, or about 3% or greater at the surface of one or more of its opposing main surfaces.

[0120] A suitable substrate 110 may exhibit an elastic modulus (or Young's modulus) in the range of about 30 GPa to about 120 GPa. In some cases, the elastic modulus of the substrate may be in the following ranges: about 30 GPa to about 110 GPa, about 30 GPa to about 100 GPa, about 30 GPa to about 90 GPa, about 30 GPa to about 80 GPa, about 30 GPa to about 70 GPa, about 40 GPa to about 120 GPa, about 50 GPa to about 120 GPa, about 60 GPa to about 120 GPa, about 70 GPa to about 120 GPa, and all ranges and subranges therein.

[0121] In one or more embodiments, the amorphous substrate may comprise glass, which may be strengthened or unstrengthened. Examples of suitable glasses include soda-lime glass, alkali aluminosilicate glass, alkali borosilicate glass, and alkali aluminosilicate glass. In some variations, the glass may be lithium oxide-free. In one or more alternative embodiments, substrate 110 may comprise a crystalline substrate, such as a glass-ceramic substrate (which may be strengthened or unstrengthened), or may comprise a single-crystal structure, such as sapphire. In one or more specific embodiments, substrate 110 comprises an amorphous substrate (e.g., glass) and a crystalline cladding (e.g., a sapphire layer, a polycrystalline alumina layer, and / or a spinel (MgAl2O4) layer).

[0122] The hardness of the substrate 110 in one or more embodiments may be less than the hardness of the entire cover plate article 100 (as measured by the Glass indenter hardness test described herein). Unless otherwise indicated, the hardness of the substrate 110 is measured using a Glass indenter hardness test.

[0123] Substrate 110 may be substantially optically clear, transparent, and free of light-scattering elements. In such embodiments, substrate 110 may exhibit an average light transmittance of about 85% or greater, about 86% or greater, about 87% or greater, about 88% or greater, about 89% or greater, about 90% or greater, about 91% or greater, or about 92% or greater in the optical wavelength range. In some embodiments, these light reflectance and transmittance values ​​may be total reflectance or total transmittance (considering the reflectance or transmittance on the two main surfaces 112, 114 of substrate 110), or may be observed on a single side of substrate 110 (i.e., only on the outermost surface 122 of the outer layer film 120, regardless of the opposing surface). Unless otherwise specified, the average reflectance or transmittance of individual substrate 110 is measured at an incident illumination angle of 0 degrees relative to the main surface 112 of the substrate (however, such measurements may also be provided at incident illumination angles of 45 degrees or 60 degrees). The substrate 110 can optionally display colors such as white, black, red, blue, green, yellow, orange, etc.

[0124] Alternatively, for aesthetic and / or functional reasons, the physical thickness of substrate 110 may vary along one or more of its dimensions. For example, the edges of substrate 110 may be thicker than the more central area of ​​substrate 110. The length, width, and physical thickness dimensions of substrate 110 may also vary depending on the application or use of cover plate article 100.

[0125] The substrate 110 can be provided using a variety of different processes. For example, in the case where the substrate 110 includes an amorphous substrate (such as glass), various formation methods may include float glass processes and pull-down processes, such as melt pull-down and slot pull-down.

[0126] After formation, the substrate 110 can be strengthened to form a reinforced substrate. As used herein, the term "reinforced substrate" can refer to a substrate that has been chemically strengthened, for example, by ion exchange between larger and smaller ions on the substrate surface. However, other strengthening methods known in the art, such as thermal tempering, or by utilizing the mismatch in the coefficients of thermal expansion between different portions of the substrate to generate compressive stress and a central tension zone, can also be used to form a reinforced substrate.

[0127] When substrate 110 is chemically strengthened by an ion exchange process, ions in the substrate surface layer are replaced or exchanged with larger ions having the same valence or oxidation state. The ion exchange process is typically performed by immersing the substrate in a molten salt bath containing larger ions to be exchanged with smaller ions in the substrate. Those skilled in the art will understand that the parameters of the ion exchange process are typically determined by the substrate composition and the desired compressive stress (CS) of the substrate caused by the strengthening operation, the depth of the compressive stress layer (or layer depth DOL or compression depth DOC), including but not limited to bath composition and temperature; immersion time; the number of times the substrate is immersed in one (or more) salt baths; the use of multiple salt baths; and additional steps such as annealing and washing. For example, ion exchange of alkali metal glass substrates can be achieved by immersion in at least one molten bath containing at least one salt containing larger alkali metal ions, such as, but not limited to, nitrates, sulfates, and chlorides. The temperature of the molten salt bath is typically in the range of about 380°C to about 450°C, and the immersion time is in the range of about 15 minutes to about 40 hours. However, temperatures and immersion times different from those described above can also be used.

[0128] Additionally, non-limiting examples of ion exchange processes in which glass substrates are immersed in multiple ion exchange baths with washing and / or annealing steps between each immersion are described below: U.S. Patent Application No. 12 / 500,650, filed July 10, 2009, entitled “Glass with Compressive Surface for Consumer Applications,” by Douglas C. Allan et al., claiming priority to U.S. Provisional Patent Application No. 61 / 079,995, filed July 11, 2008, in which glass substrates are strengthened by multiple successive ion exchange treatments involving immersion in salt baths of varying concentrations; and Christopher M. Lee et al., published November 20, 2012, entitled “Dual Stage Ion Exchange for Chemical Strengthening of…” U.S. Patent No. 8,312,739, entitled “Glass,” claims priority to U.S. Provisional Patent Application No. 61 / 084,398, filed July 29, 2008, in which a glass substrate is strengthened by ion exchange in a first bath diluted with effluent ions, followed by immersion in a second bath in which the concentration of effluent ions is less than that in the first bath. The contents of U.S. Patent Application No. 12 / 500,650 and U.S. Patent No. 8,312,739 are incorporated herein by reference in their entirety.

[0129] The degree of chemical strengthening achieved through ion exchange can be quantified based on parameters such as center tension (CT), surface stress (CS), and depth of compression (DOC). Compressive stress (including surface CS) can be measured using a surface stress meter (FSM) with commercially available instruments, such as the FSM-6000 manufactured by Orihara Industrial Co., Ltd. (Japan). Surface stress measurement relies on the accurate measurement of the stress optical coefficient (SOC) associated with the birefringence of the glass. SOC is measured according to Procedure C (the glass disk method) of ASTM standard C770-16, entitled "Standard Test Method for Measurement of Glass Stress-Optical Coefficient," the contents of which are incorporated herein by reference in their entirety. The maximum CT value is measured using a scattered light polarizer (SCALP) technique known in the art. As used herein, DOC refers to the depth to which stress changes from compression to tension in the chemically strengthened alkali aluminosilicate glass article described herein. Depending on the ion exchange treatment, DOC can be measured using either FSM or SCALP. When stress in glass is generated by exchanging potassium ions into the glass, FSM is used to measure DOC. When stress is generated by exchanging sodium ions into the glass, SCALP is used to measure DOC. When stress in glass is generated by exchanging both potassium and sodium ions into the glass, SCALP measures DOC because the exchange depth of sodium is considered to indicate DOC, and the exchange depth of potassium ions indicates a change in the magnitude of compressive stress (but not a change in stress from compression to tension); the exchange depth of potassium ions in such glass is measured by FSM.

[0130] In one embodiment, the surface CS of the substrate 110 can be 200 MPa or greater, 250 MPa or greater, 300 MPa or greater, such as 400 MPa or greater, 450 MPa or greater, 500 MPa or greater, 550 MPa or greater, 600 MPa or greater, 650 MPa or greater, 700 MPa or greater, 750 MPa or greater, or 800 MPa or greater. The strengthening substrate may have a DOC (formerly known as DOL) of 10 µm or larger, 15 µm or larger, 20 µm or larger (e.g., 25 µm, 30 µm, 35 µm, 40 µm, 45 µm, 50 µm or larger) and / or a CT of 10 MPa or larger, 20 MPa or larger, 30 MPa or larger, 40 MPa or larger (e.g., 42 MPa, 45 MPa or 50 MPa or larger) but less than 100 MPa (e.g., 95, 90, 85, 80, 75, 70, 65, 60, 55 MPa or smaller). In one or more specific embodiments, the strengthening substrate has one or more of the following: a surface CS greater than 500 MPa, a DOC (formerly known as DOL) greater than 15 µm, and a CT greater than 18 MPa.

[0131] Example glasses that can be used in substrate 110 may include alkali aluminosilicate glass compositions or alkali aluminoborosilicate glass compositions, but other glass compositions are contemplated. Such glass compositions are capable of chemical strengthening via ion exchange processes. One example glass composition comprises SiO2, B2O3, and Na2O, wherein (SiO2 + B2O3) ≥ 66 mol.% and Na2O ≥ 9 mol. In one embodiment, the glass composition comprises at least 6 wt.% alumina. In another embodiment, the substrate comprises a glass composition containing one or more alkaline earth metal oxides, such that the content of the alkaline earth metal oxide is at least 5 wt.%. In some embodiments, suitable glass compositions further comprise at least one of K2O, MgO, and CaO. In a particular embodiment, the glass composition used in the substrate may contain 61-75 mol.% SiO2; 7-15 mol.% Al2O3; 0-12 mol.% B2O3; 9-21 mol.% Na2O; 0-4 mol.% K2O; 0-7 mol.% MgO; and 0-3 mol.% CaO.

[0132] Another example glass composition suitable for substrate 110 comprises: 60-70 mol.% SiO2; 6-14 mol.% Al2O3; 0-15 mol.% B2O3; 0-15 mol.% Li2O; 0-20 mol.% Na2O; 0-10 mol.% K2O; 0-8 mol.% MgO; 0-10 mol.% CaO; 0-5 mol.% ZrO2; 0-1 mol.% SnO2; 0-1 mol.% CeO2; less than 50 ppm As2O3; and less than 50 ppm Sb2O3; wherein 12 mol.% (Li₂O + Na₂O + K₂O) 20 mol.% and 0 mol.% (MgO + CaO) 10 mol.%.

[0133] Another example glass composition suitable for substrate 110 comprises: 63.5-66.5 mol.% SiO2; 8-12 mol.% Al2O3; 0-3 mol.% B2O3; 0-5 mol.% Li2O; 8-18 mol.% Na2O; 0-5 mol.% K2O; 1-7 mol.% MgO; 0-2.5 mol.% CaO; 0-3 mol.% ZrO2; 0.05-0.25 mol.% SnO2; 0.05-0.5 mol.% CeO2; less than 50 ppm As2O3; and less than 50 ppm Sb2O3; wherein 14 mol.% (Li₂O + Na₂O + K₂O) 18 mol.% and 2 mol.% (MgO + CaO) 7 mol.%.

[0134] In a particular embodiment, the alkali aluminosilicate glass composition suitable for substrate 110 comprises alumina, at least one alkali metal, and in some embodiments greater than 50 mol.% SiO2, in other embodiments at least 58 mol.% SiO2, and in still other embodiments at least 60 mol.% SiO2, wherein the ratio (Al2O3 + B2O3) / The modifier (i.e., the sum of the modifiers) is greater than 1, wherein in the ratio, each component is expressed in mol.% and the modifier is an alkali metal oxide. In a particular embodiment, this glass composition comprises: 58-72 mol.% SiO2; 9-17 mol.% Al2O3; 2-12 mol.% B2O3; 8-16 mol.% Na2O; and 0-4 mol.% K2O, wherein the ratio (Al2O3 + B2O3) / The modifier (i.e., the sum of modifiers) is greater than 1.

[0135] In another embodiment, the substrate 110 may include an alkali aluminosilicate glass composition comprising: 64-68 mol.% SiO2; 12-16 mol.% Na2O; 8-12 mol.% Al2O3; 0-3 mol.% B2O3; 2-5 mol.% K2O; 4-6 mol.% MgO; and 0-5 mol.% CaO, wherein: 66 mol.% ≤ SiO2 + B2O3 + CaO ≤ 69 mol.%; Na2O + K2O + B2O3 + MgO + CaO + SrO > 10 mol.%; 5 mol.% ≤ MgO + CaO + SrO ≤ 8 mol.%; (Na2O + B2O3) - Al2O3 ≤ 2 mol.%; 2 mol.% ≤ Na2O - Al2O3 ≤ 6 mol.%; and 4 mol.% ≤ (Na2O + K2O) - Al2O3 ≤ 10 mol.%.

[0136] In an alternative embodiment, substrate 110 may comprise an alkali aluminosilicate glass composition comprising 2 mol.% or more of Al2O3 and / or ZrO2, or 4 mol.% or more of Al2O3 and / or ZrO2.

[0137] When the substrate 110 includes a crystalline substrate, the substrate may include a single crystal, which may include Al2O3. Such a single-crystal substrate is called sapphire. Other suitable materials for crystalline substrates include polycrystalline alumina layers and / or spinel (MgAl2O4).

[0138] Optionally, the substrate 110 may be crystalline and comprises a glass-ceramic substrate, which may be strengthened or unstrengthened. Examples of suitable glass-ceramics may include Li₂O-Al₂O₃-SiO₂ system (i.e., LAS system) glass-ceramics, MgO-Al₂O₃-SiO₂ system (i.e., MAS system) glass-ceramics, and / or glass-ceramics comprising a major crystalline phase including β-quartz solid solution, β-spodumene (SS), cordierite, and lithium disilicate. The glass-ceramic substrate may be strengthened using the chemical strengthening methods disclosed herein. In one or more embodiments, the MAS system glass-ceramic substrate may be strengthened in a Li₂SO₄ molten salt, thereby enabling 2Li₂SO₄ strengthening. + With Mg 2+ The exchange.

[0139] The substrate 110 according to one or more embodiments may have a physical thickness ranging from about 50 µm to about 5 mm in various portions of the substrate 110. Example substrates 110 have physical thicknesses ranging from about 50 µm to about 500 µm (e.g., 50, 75, 100, 200, 300, 400, or 500 µm). Other example substrates 110 may have physical thicknesses ranging from about 50 µm to about 5000 µm (e.g., 50, 75, 100, 250, 500, 600, 700, 800, 900, 1000, 1250, 1500, 1750, 2000, 2500, 3000, 3500, 4000, 4500, or 5000 µm). The physical thickness of the substrate 110 may be greater than about 1 mm (e.g., about 2, 3, 4, or 5 mm). In one or more embodiments, the physical thickness of the substrate 110 may be 2 mm or less, or less than 1 mm. The substrate 110 may undergo acid polishing or other treatments to remove or reduce the impact of surface defects.

[0140] Referring again to the cover plate article 100 of this disclosure, such as Figure 1 , 1A As depicted in exemplary form, the outer layer film 120 can be formed using various deposition techniques (e.g., reactive sputtering) readily understood by those skilled in the art. Furthermore, given the relatively high number of layers and total thickness associated with embodiments of the outer layer film 120, reactive sputtering deposition can be tuned to a lower power level (e.g., 1-2.5 kW in the inductively coupled reactive plasma zone of a metal-mode sputtering roller coater) to minimize the substrate temperature to less than 300°C during deposition. Without being bound by theory, this method of adjustment can be used to retain the maximum level of chemically strengthened induced compressive stress in the strengthened glass or transparent glass-ceramic substrate 110.

[0141] Figure 1 ,1A The cover article 100, depicted in an exemplary form and disclosed herein, may be included in another article, such as an article with a display (or display article) (e.g., consumer electronics, including mobile phones, tablets, computers, navigation systems, etc.), a building article, a transport article (e.g., automobiles, trains, airplanes, ships, etc.), an electrical article, or any article having one or more sensors requiring protection (e.g., scratch resistance, abrasion resistance, hardness, chemical durability, or a combination thereof) and optical bandpass filtering capability. Exemplary articles comprising any of the cover articles disclosed herein... Figure 2A and 2B shown in . Specifically, Figure 2A and 2B A consumer electronics product 200 is shown, comprising a housing 202 having a front surface 204, a rear surface 206, and side surfaces 208; and electronic components (not shown) at least partially or entirely located within the housing 202 and including a display 210, a sensor 220a, and an optional light emitter 220b. Further, the display 210 is located on or adjacent to the front surface 204 of the housing 202, and the sensor 220a and emitter 220b are located on or adjacent to the front surface 204 or the rear surface 206 of the housing 202. Additionally, a display cover 212 is disposed on or above the display 210, and a sensor cover 213 is disposed above the sensor 220a and emitter 220b.

[0142] exist Figure 2A and 2BIn some embodiments of the consumer electronics product 200 shown, at least one of the sensor cover 213 or a portion of the housing 202 may include any cover article 100 disclosed herein. In these embodiments, the combination of sensor 220a and optional transmitter 220b may be a biometric sensor or other sensor that operates at one or more non-overlapping wavelengths corresponding to the center wavelength of a selected high-transmission band of the coated cover article 100. For example, the center wavelength of each of the non-overlapping wavelengths is in the spectrum of 400 nm to 1200 nm (e.g., 450–590 nm, 600–750 nm, and / or 800–1200 nm, etc.). In other embodiments, the consumer electronics product 200 is a mobile phone, and sensor 220a and optional transmitter 220b may provide biometric sensing functionality (e.g., for body temperature, glucose, heart rate sensing, etc.) when placed in contact with or near human skin. In other embodiments (not shown), sensor 220a and optional transmitter 220b may be arranged together with sensor cover 213 containing one or more cover articles 100 of this disclosure in the device housing 202 as separate biometric sensors to be installed or attached to human skin, for example as glucose sensors, heart rate sensors, ECG sensor devices, etc.

[0143] In other embodiments, the consumer electronics product may be a wearable electronic device 300, such as... Figure 2C and 2DThe device is depicted as a smartwatch, smart ring, or smart glasses. In this configuration, the wearable electronics 300 includes a strap 330; a housing 302 having a front surface 304 and a rear surface 306; electronic components (not shown) at least partially or entirely located within the housing 302; a display 310; two additional sensors 320a and 320c; and an optional light emitter 320b. Further, the display 310 is located on or adjacent to the front surface 304 of the housing 302, and the sensors 320a and 320c and the emitter 320b are located on or adjacent to the rear surface 306 of the housing 302. Additionally, a sensor cover 313 is disposed over the sensors 320a and 320c and the emitter 320b. Further, at least one of the sensor cover 313 or a portion of the housing 302 may include any cover article 100 disclosed herein. In this configuration, sensors 320a and 320c, along with an optional transmitter 320b, can provide biometric sensing capabilities such as heart rate, ECG, body temperature, heart rate variability, respiratory rate, blood oxygen saturation, blood pressure, or blood glucose sensing. Further, in these embodiments, a combination or system of sensors 320a and 320c, along with an optional transmitter 320b, can be used as a biometric sensor or other sensor operating at one or more non-overlapping wavelengths corresponding to the center wavelength of a selected high-transmittance band of the coated cover plate article 100. For example, the center wavelength of each of the non-overlapping wavelengths is within the spectrum of 400 nm to 1200 nm (e.g., 450–590 nm, 600–750 nm, and / or 800–1200 nm, etc.). The coated cover plate article 100 may have multiple high-transmittance bands characterized by multiple center wavelengths, such as two, three, four, five, six, seven, eight, nine, or even ten discrete transmission bands, characterized by high transmittance (e.g., >70%) under normal incidence near the center wavelength of the bands, and low transmittance (e.g., <50%) under normal incidence at wavelengths far from the center wavelength of the selected transmission bands (greater than 5 nm, 10 nm, 20 nm, 30 nm, 40 nm, or 50 nm from said center wavelength). This spectral distribution is designed to produce lower transmittance for the selected center wavelength at selected non-non ...

[0144] Example

[0145] Various embodiments will be further illustrated by the following examples (Ex. 1A-1C and Ex. 2). As those skilled in the art will understand, computational techniques, particularly transfer matrix modeling techniques, are used to model the optical properties of the examples (e.g., bisurface transmittance, bisurface reflection color) to model the thin film performance. The modeling utilizes the transfer matrix modeling technique derived from the film (e.g., having SiO₂). x N y and SiN x The properties of thin films (e.g., refractive index values) obtained by previous thin film reactive sputtering, laboratory experiments, and high-volume sputtering fabrication of high-RI layers.

[0146] In previous experiments, the refractive index (varying with wavelength) of each of the formed layers and the glass substrate was measured using a spectroscopic ellipsometry. The reflected spectrum of the example was then calculated using these measured refractive indices. For convenience, the example uses a single refractive index value in its descriptive table, corresponding to a point at approximately 550 nm wavelength selected from the dispersion curve.

[0147] In the following example cover articles, the article exhibits an optimized combination of high transmittance at two or more non-overlapping wavelengths or wavelength bands in the 400 nm to 1200 nm spectrum with the cover article’s mechanical properties suitable for providing protection for sensors (e.g., high hardness, abrasion resistance, scratch resistance, and chemical durability).

[0148] Example 1A

[0149] The reinforced glass substrate is coated with the outer layer film shown in Table 1 below, designated as Ex. 1A. Specifically, the outer layer film of Ex. 1A has a total of 61 layers with a total thickness of 6855.2 nm, including alternating high-refractive-index and low-refractive-index layers, a low-refractive-index layer in contact with the substrate (i.e., the 61st layer with a thickness of 25.0 nm), and an oxide capping layer at the outermost position of the stack (i.e., the 1st layer with a thickness of 25.0 nm).

[0150] refer to Figure 3A The document provides the bisurface transmittance of the cover article of this example (Ex. 1A) at wavelengths of 525 nm, 690 nm, and 940 nm as a function of wavelengths. Up to 9 A drawing that varies with the angle of incidence. For example, from... Figure 3AIt is evident that the bandpass filter of Ex. 1A has >90% transmittance at 525 nm from 0–20 degrees and at 690 nm and 940 nm from 0–35 degrees. At 525 nm for most or all angles in the 30–90 degree range and at 690 nm and 940 nm for most or all angles in the 45–90 degree range, transmittance drops below 15%.

[0151] refer to Figure 3B This provides a drawing of the bisurface reflectance colors of the cover plate article for all viewing angles from 0 to 90 degrees under a D65 illuminator. (See diagram from...) Figure 3B It is evident that the bandpass filter of Ex. 1A exhibits a reddish hue in reflected light at near-normal incidence, characterized by reflections at incidence angles of 0-10 degrees according to CIE 1964 and D65 standards. The value is greater than 10 or greater than 20.

[0152] Table 1 - Ex. 1A, Cover plate products for sensors

[0153]

[0154]

[0155] refer to Figure 3C The cover plate article provided here (Ex. 1A) is for use with this example. and 5 A plot of the bisurface transmittance as a function of wavelength under a D65 illuminator at all incident angles. This is achieved by examining the polarization-average transmittance of Ex. 1A as a function of the wavelength spectrum (e.g., ...). Figure 3C As shown), one of the working principles of the cover plate article of this disclosure can be further explained. Ex. 1A's outer layer film is designed to have three discrete high-transmittance bands separated by low-transmittance bands (the low-transmittance bands are also high-reflectance bands because this coating is primarily non-absorbent). Figure 3C As shown, under zero-degree incident light, Ex. 1A exhibits high transmittance (>90%) in the following three wavelength ranges: 1) 518-536 nm; 2) 687-737 nm; and 3) 930-1002 nm. Utilizing the properties of multilayer thin-film interference, these transmission bands shift to shorter wavelengths at higher incident angles. For example... Figure 3C As shown, at an incident angle of 50 degrees, the spectrum has been shifted sufficiently such that the transmittance in each of the three original wavelength bands defined earlier is less than 20%: 1) 518-536 nm; 2) 687-737 nm; and 3) 930-1002 nm.

[0156] Figure 3C These observations demonstrate that any three wavelengths within these three ranges can be selected as the sensor operating wavelengths to work with this outer-layered film design, exhibiting similar strong angular cutoff performance, shifting from >90% transmittance to <20% transmittance between 0° and 50° incident angles. Figure 3A The plot showing the individual transmittance as a function of the incident angle illustrates that other angles may also provide different levels of cutoff performance.

[0157] Example 1B

[0158] The tempered glass substrate is coated with the outer layer film shown in Table 2 below, designated as Ex. 1B. Specifically, the outer layer film of Ex. 1B has a total of 55 layers with a total thickness of 6615.7 nm, including alternating high-refractive-index and low-refractive-index layers, a low-refractive-index layer in contact with the substrate (i.e., the 55th layer with a thickness of 25.0 nm), and an oxide capping layer at the outermost position of the stack (i.e., the 1st layer with a thickness of 25.0 nm).

[0159] refer to Figure 4A The document provides the bisurface transmittance of the cover article of this example (Ex. 1B) at wavelengths of 525 nm, 690 nm, and 940 nm as a function of wavelengths. Up to 9 A drawing that varies with the angle of incidence. For example, from... Figure 4A It is evident that the bandpass filter of Ex. 1B has >85% transmittance at 525 nm from 0–20 degrees and at 690 nm and 940 nm from 0–35 degrees. At 525 nm, transmittance drops below 50% for most or all angles in the 25–90 degree range, and below 10% for angles in the 30–50 degree range. For 690 nm and 940 nm, transmittance is below 25% for most or all angles in the 45–90 degree range.

[0160] refer to Figure 4B This provides a drawing of the bisurface reflectance colors of the cover plate article for all viewing angles from 0 to 90 degrees under a D65 illuminator. (See diagram from...) Figure 4B It is evident that the bandpass filter of Ex. 1B exhibits a blue-green hue in its bisurface reflection under near-normal incidence, characterized by CIE1964 and D65 reflections at incidence angles of 0-10 degrees. Values ​​less than 0 or between -60 and 0. For example, from... Figure 4B It is also evident that the color of the bisurface reflection can remain in the green-blue sphere, for all light incident angles from 0 to 90 degrees. All are less than +5.

[0161] Table 2 - Ex. 1B, Cover plates for sensors

[0162]

[0163]

[0164] Example 1C

[0165] The tempered glass substrate is coated with the outer layer film shown in Table 3 below, designated as Ex. 1C. Specifically, the outer layer film of Ex. 1C has a total of 69 layers with a total thickness of 7318.84 nm, including alternating high-refractive-index and low-refractive-index layers, a low-refractive-index layer in contact with the substrate (i.e., the 69th layer with a thickness of 25.0 nm), and an oxide capping layer at the outermost position of the stack (i.e., the 1st layer with a thickness of 53.3 nm).

[0166] refer to Figure 5A The document provides the bisurface transmittance of the cover article of this example (Ex. 1C) at wavelengths of 525 nm, 690 nm, and 940 nm as a function of wavelengths. -9 A drawing that varies with the angle of incidence. For example, from... Figure 5A It is evident that the Ex. 1C bandpass filter exhibits >90% transmittance from 0-10 degrees at 525 nm and 690 nm, and from 0-25 degrees at 940 nm. At wavelengths of 525 nm and 690 nm, for 20-9... Or 40-9 At most or all angles, and at a wavelength of 940 nm for all angles between 50 and 90 degrees, the transmittance drops below 30%.

[0167] refer to Figure 5B The cover plate article provided for this example (Ex. 1C) is for 0-9 A drawing of the colors of the double-surface reflections under a D65 illuminant from all perspectives. (See from...) Figure 5B As is evident, the bandpass filter of Ex. 1C exhibits a neutral or silvery bisurface reflective color for all incident angles of light from 0 to 90 degrees. The bisurface reflective color of the cover article of this example (Ex. 1C), modeled under a CIE 1964, D65 illuminator, can be limited to a range of a... The range is -15 to +5, -10 to +2, or even -6 to +1. Within the value range. Furthermore, such as from... Figure 5BIt is obvious that the same bisurface reflective color can be limited to b for all incident angles from 0 to 90 degrees. The calculation is from -10 to +10 or even b. The range is calculated to be -6 to +6. Additionally, the color of the double-surface reflection under normal incidence can be determined by a... and b It falls within the neutral range of -2 to +2 or even -1 to +1.

[0168] Table 3 - Ex. 1C, Cover plates for sensors

[0169]

[0170]

[0171] Example 2

[0172] The reinforced glass substrate was coated with the outer layer film shown in Table 4 below, designated as Ex. 2. Specifically, the outer layer film of Ex. 2 has a total of 71 layers with a total thickness of 8877.5 nm, including alternating high-refractive-index and low-refractive-index layers, a low-refractive-index layer in contact with the substrate (i.e., the 71st layer with a thickness of 32 nm), an oxide capping layer at the outermost position of the stack (i.e., the 1st layer with a thickness of 108.6 nm), and a scratch-resistant layer (i.e., the 2nd layer with a thickness of 1492.3 nm).

[0173] refer to Figure 6A The bisurface transmittance of the cover article of this example (Ex. 2) at wavelengths of 525 nm, 690 nm, and 940 nm is provided as a function of wavelengths. -9 A drawing that varies with the angle of incidence. For example, from... Figure 6A It is evident that the bandpass filter of Ex. 2 exhibits >90% transmittance from 0-10 nm at 525 nm, 690 nm, and 940 nm. At wavelengths of 525 nm and 690 nm, it also shows >90% transmittance from 0-10 nm. Or 40-9 At most or all angles, and at a wavelength of 940 nm for all angles between 50 and 90 degrees, the transmittance drops below 30%.

[0174] refer to Figure 6B The cover plate article provided for this example (Ex. 2) is for 0-9 A drawing of the colors of the double-surface reflections under a D65 illuminant from all perspectives. (See from...) Figure 6BAs is evident, the bandpass filter of Ex. 2 exhibits a neutral or silvery bisurface reflective color for all incident angles of light from 0 to 90 degrees. The bisurface reflective color of the cover article of this example (Ex. 2), modeled under a CIE 1964, D65 illuminator, can be limited to -1.5 to +5 Å for all incident angles from 0 to 90 degrees. Values ​​and b from -6 to +2 Within the range of values.

[0175] Table 4 - Ex. 2, Cover plates for sensors

[0176]

[0177]

[0178] Additionally, Table 5 below provides a summary of the average transmittance of the examples (Ex. 1A-1C, 2) of this disclosure for different incident angle ranges at selected wavelengths (525 nm, 690 nm, and 940 nm). As is evident from Table 5, all examples show the average transmittance for each of the selected wavelengths (525 nm, 690 nm, and 940 nm) in the range of 0-1 and -2 The average transmittances under near-normal incident light are >92% and >72%, respectively. Furthermore, for each wavelength in the selected range, for 20–9… 30-9 40-9 and 50-9 Over the range of incident angles, the transmittance level drops below 45% in the example (and below 30% for most of the incident angle range).

[0179] All bifacial transmittance performance levels cited in the tables and figures of this disclosure are calculated for cover articles with an outer layered film on only one main surface and an uncoated substrate on the other main surface. This uncoated main surface typically increases reflectance by ~4%, thus reducing the reported bifacial transmittance values ​​by the same ~4%. Therefore, by adding a known broadband antireflective coating to the uncoated main surface of the substrate of these cover articles, the transmittance values ​​reported here can be increased by 3-3.5%.

[0180] Table 5 - Summary of the average transmittance of cover plates used for sensors at selected wavelengths within a selected incident angle range (Ex. 1A-1C and Ex. 2)

[0181]

[0182] Example 3-6

[0183] Examples 3-6 below are designed to operate with a combination of three transmission bands, the center wavelengths of which differ from those in Examples 1A-1C and 2. Specifically, the selected center wavelengths for each transmission band in Examples 3-6 (designated "Ex. 3", "Ex. 4", "Ex. 5", and "Ex. 6") are chosen to be 530 nm, 645 nm, and 940 nm. Furthermore, the design of Ex. 3-6 takes into account maintaining high transmittance for consecutive wavelength bands around each center wavelength at near-normal incident angles (specifically, 520-535 nm for the first wavelength band, 640-650 nm for the second wavelength band, and 925-955 nm for the third wavelength band). Maintaining controllable widths of these high transmission bands is crucial for accommodating variations in LED source spectral width, LED manufacturing processes, and bandpass filter coating manufacturing, while also maintaining sharp bandpass filter performance to reduce transmittance at higher incident angles for these same wavelengths.

[0184] Importantly, experimental fabrication of selected examples via reactive sputtering demonstrates that by using SiO with a slightly lower refractive index... x N y The use of components with higher refractive indices in coating stacks can improve transmission performance, particularly in the 520-535 nm band and similar wavelength ranges (e.g., 500-600 nm). Without being bound by theory, this is thought to be related to the fact that sputtered SiO2 typically absorbs less light at visible wavelengths than sputtered SiN. x This is relevant. Therefore, it is believed that increasing SiO2 is beneficial. x N y The increased oxygen content will make it closer to a composition similar to SiO2, thus reducing absorption. However, careful optimization is needed because excessively increasing the oxygen content and decreasing the SiO2 content can lead to problems. x N y The refractive index of this material makes it extremely difficult to achieve the strong optical contrast required to realize the high contrast between normal incident transmittance and off-center transmittance, which is a key feature of the bandpass filter of this invention. Excessive addition of SiO2... x N y The oxygen content in the coating also reduces hardness. Absorption by high-refractive-index coating materials can be a problem, especially for relatively thick coating stacks, such as the cover plate article designs of this disclosure, particularly in the visible wavelength range of 400-700 nm, especially when maximizing the percentage of high-refractive-index coating materials to improve hardness, abrasion resistance, or other mechanical properties.

[0185] Therefore, Example 3-6 is optimized for these multiple considerations, and its high refractive index composition is SiO. xN y The refractive index at 525 nm is ~1.9, which reduces absorption in these relatively thick coating stacks and achieves high transmittance levels (e.g., greater than 90%, greater than 91%, greater than 92%, greater than 93%, or even greater than 94%) in the 520–535 nm wavelength range or other selected wavelength ranges of 400–700 nm (see also Table 10 below), even in cases where the coating stack contains a relatively high percentage of high-refractive-index material (which is desirable for producing high hardness). The design objective of the selected examples (especially Ex. 4, 5, and 6, described in detail below) is to increase the article hardness by maximizing the percentage of high-refractive-index material contained in the coating stack. Additionally, this is achieved by maximizing the inclusion of high-refractive-index SiO in the top 500 nm, 1000 nm, or 2000 nm of the coating stack. x N y The percentage of material used to improve near-surface hardness. Another strategy for maximizing hardness is to target the thickness of the outermost high-refractive-index layer to be greater than 100 nm, 150 nm, or 200 nm. Experiments have shown that this maximizes the hardness of these types of coatings produced by reactive sputtering. Furthermore, the design aims to utilize the maximum number (or highest proportion) of high-refractive-index layers with a thickness greater than 100 nm, 150 nm, or 200 nm.

[0186] As shown in Table 6 below, Example 3 (Ex. 3) exhibits high average transmittance (greater than 94%) at all three central design wavelengths of 530 nm, 645 nm, and 940 nm for near-normal incident angles of 0–10 degrees (see Table 6). Figures 7A-7C Ex. 3 also exhibits low average transmittance (below 20%) at wavelengths of 530 nm and 645 nm for incident angles of 20–90 degrees (see...). Figure 7A and 7B Furthermore, at a wavelength of 940 nm, it exhibits a transmittance of less than 30% for incident angles of 40–90 degrees (see [reference]). Figure 7C Example 3 has a red-gold ('rose gold') appearance, where the normal incident color is red, and the color transitions to yellow or gold at higher incident points (see...). Figure 7D ).

[0187] Table 6 - Ex. 3, Cover plates for sensors

[0188]

[0189]

[0190] As shown in Table 7 below, Example 4 (Ex. 4) exhibits high average transmittance (greater than 94%) at all three central design wavelengths of 530 nm, 645 nm, and 940 nm for near normal incident angles of 0–10 degrees and 0–20 degrees (see Table 7). Figures 8A-8C Example 4 also exhibits low average transmittance (below 20%) at wavelengths of 530 nm and 645 nm for incident angles of 40–90 degrees (see [link to example 4]). Figure 8A and 8B Furthermore, at a wavelength of 940 nm, it exhibits a transmittance of less than 30% for incident angles of 40–90 degrees (see [reference]). Figure 8C Example 4 has a red-green appearance, where the normal incident color is red, and the color transitions to green at higher incident points (see [reference]). Figure 8D ).

[0191] Table 7 – Ex. 4, Cover plates for sensors

[0192]

[0193]

[0194] As shown in Table 8 below, Example 5 (Ex. 5) exhibits high average transmittance (greater than 93%) at all three central design wavelengths of 530 nm, 645 nm, and 940 nm for near normal incident angles of 0–10 degrees and 0–20 degrees (see Table 8). Figures 9A-9C Example 5 also exhibits low average transmittance (below 25%) at wavelengths of 530 nm, 645 nm, and 940 nm for incident angles of 40–90 degrees (see [link to example 5]). Figures 9A-9C Example 5 has a red-green appearance, where the normal incident color is red, and the color transitions to green at higher incident points (see [reference]). Figure 9D A notable feature of Example 5 is the very high percentage of physical thickness containing high-refractive-index (high-hardness) materials, especially in the near-surface region, where selected metrics are summarized in Table 8 below.

[0195] Table 8 – Ex. 5, Cover plates for sensors

[0196]

[0197]

[0198] Example 6 (Ex. 6) shown in Table 9 below exhibits high average transmittance (greater than 92%) at all three central design wavelengths of 530 nm, 645 nm, and 940 nm for near-normal incident angles of 0–10 degrees (see Table 9). Figures 10A-10CExample 6 also exhibits low average transmittance (below 25%) at wavelengths of 530 nm and 645 nm for incident angles of 20–90 degrees (see [link]). Figure 10A and 10B Furthermore, at a wavelength of 940 nm, it exhibits a transmittance of less than 30% for incident angles of 50–90 degrees (see [reference]). Figure 10C Example 6 is notably characterized by its more neutral color, exhibiting a silvery hue at near-normal incidence and a silver-green hue at higher angles of incidence. The color of Example 6 across the entire angle of incidence range of 0–90 degrees is contained within a... The total is -12 to +4 and b. The range is from -6 to +13. Example 6's near-normal incident color is within the range of a. and b The range is from -2 to +2 (see Figure 10D ).

[0199] Table 9 - Ex. 6, Cover plates for sensors

[0200]

[0201]

[0202] Table 10 - Summary of the average transmittance of cover plates used for sensors at selected wavelengths within a selected incident angle range (Ex. 3-6)

[0203]

[0204] Example 7, as shown in Table 11 below, exhibits high average transmittance (greater than 93%) in a single wavelength band with a center design wavelength of 530 nm and a transmission bandwidth of approximately 510–550 nm. Example 7 also exhibits low average transmittance (less than 21%) at 530 nm wavelength for incident angles of 30–90 degrees (see Table 11). Figure 11A ). Figure 11A This is a plot showing the bisurface transmittance of the cover plate article of Example 7 at wavelengths of 520 nm, 530 nm, and 540 nm as a function of incident angles from 0° to 90°. The colors of Example 7 across the entire incident angle range of 0–90 degrees are contained within the values ​​expressed in a... The range is -60 to +60 and b. The range is from -10 to +70 (see Figure 11B ). Figure 11BThis is a drawing of the bi-surface reflective colors of the cover plate article of Example 7 under a D65 illuminator for all viewing angles from 0 to 90 degrees. Example 7 has a red-green reflective color appearance, where the normal incident color is red and the color transitions to green at higher incident angles. A notable feature of Example 7 is its reduced thickness compared to other examples, with a total coating thickness of less than 3 micrometers and only 19 coating layers.

[0205] Table 11 - Ex. 7, Cover plates for sensors

[0206]

[0207] Example 8, as shown in Table 12 below, exhibits high average transmittance (greater than 92%) in a single wavelength band with a center design wavelength of 530 nm and a transmission bandwidth of approximately 520–540 nm. Example 8 also exhibits low average transmittance (less than 30%) at 530 nm wavelength for incident angles of 30–90 degrees (see Table 12). Figure 12A ). Figure 12A Plotting of the bisurface transmittance of the cover article of Example 8 at wavelengths of 520 nm, 530 nm, and 540 nm as a function of incident angles from 0° to 90°. A notable feature of Example 8 is its more neutral color, exhibiting a near-silver hue at all incident angles. The color of Example 8 across the entire incident angle range of 0–90 degrees is contained within a... Calculate -4 to +5 and with b The range is from -4 to +2.5 (see...). Figure 12B ). Figure 12B Example 8 shows the double-surface reflective color of the cover plate for all viewing angles from 0 to 90 degrees under a D65 illuminator.

[0208] Table 13 summarizes the average transmittance of cover plates used for sensors at selected wavelengths within a selected incident angle range (Ex. 7-8).

[0209] Table 12 - Ex. 8, Cover plates for sensors

[0210]

[0211]

[0212] Table 13 - Summary of the average transmittance of cover plates used for sensors at selected wavelengths within a selected incident angle range (Ex. 7-8)

[0213]

[0214] Example 9 below is designed to operate with a combination of three transmission bands having the same three center wavelengths as Examples 3-6: 530 nm, 645 nm, and 940 nm. The design of Ex. 9 also considers maintaining high transmittance for consecutive wavelength bands around each center wavelength at near-normal incident angles (specifically, 520-535 nm for the first band, 640-650 nm for the second band, and 925-955 nm for the third band). Example 9 differs from Examples 3-6 in that it uses TiO2 as the high refractive index material in the multilayer stack. Since the refractive index of TiO2 is higher than that of SiOxNy used in Examples 3-6, Example 9 achieves comparable optical performance with fewer layers and a thinner overall coating thickness compared to Example 6, which is optically most similar to Example 9. Although Examples 6 and 9 feature complex multi-wavelength bandpass filter functionality, they are both designed to have neutral color characteristics. SiOxNy or SiNx can be preferred high-refractive-index materials for applications where the bandpass filter is exposed to manipulation or scratching events (such as the exterior of a camera lens, smartwatch, or mobile phone). However, for applications where the bandpass filter coating can be protected (e.g., placed on the inner surface of a lens or cover glass, facing the internal housing of a sensor or device), TiO2 or other materials with a higher refractive index than SiNx or SiOxNy are preferred. Other materials, including Nb2O5, Ta2O5, and ZrO2, can also be used in addition to TiO2. Another structural difference in Example 9 is that Ex. 9 uses a high-refractive-index material as the outermost and final layer of the optical coating, unlike the other examples. Ex. 9 can be capped with an optional hydrophobic layer (e.g., a silane or fluorosilane layer), as in all other examples. These hydrophobic layers are not shown in the optical stacking design table.

[0215] As shown in Table 14 below, Example 9 (Ex. 9) exhibits high average transmittance (greater than 93%) at all three central design wavelengths of 530 nm, 645 nm, and 940 nm for near-normal incident angles of 0–10 degrees (see Table 14). Figures 13A-13C Example 9 also exhibits low average transmittance (below 20%) at wavelengths of 530 nm and 645 nm for incident angles of 20–90 degrees (see [link]). Figure 13A and 13B Furthermore, at a wavelength of 940 nm, it exhibits an average transmittance of less than 30% for incident angles of 30–90 degrees (see [reference]). Figure 13CSimilar to Example 6, a notable feature of Example 9 is its more neutral color, exhibiting silver under near-normal incidence and silver-green at higher angles of incidence. Achieving such neutral colors in this type of multi-wavelength bandpass filter is difficult because the discrete transmission and reflection bands required within the visible wavelength range (necessary for angular bandpass cutoff) typically result in wavelength-selective reflection, easily leading to high color intensity. The color of Example 9 across the entire 0-90 degree angle of incidence range is contained within a... The total is -8 to +5 and b. The range is from -8 to +5. Example 6 shows the near-normal incident color (0 to 10 degrees of incidence) in the range of a. and b The range is from -2 to +2 (see Figure 13D ).

[0216] Table 14 - Ex. 9, Cover plates for sensors

[0217]

[0218]

[0219] Table 20 - Summary of the average transmittance of cover plates used for sensors at selected wavelengths within a selected incident angle range (Ex. 9)

[0220]

[0221] The glass substrates used in the examples described herein are reinforced glass substrates sold under the brand name Corning® Gorilla Glass® 3. For further details regarding Corning® Gorilla Glass® 3, please refer to commonly assigned U.S. Patent Nos. 8,951,927 and 9,714,192, both of which are incorporated herein by reference. It should be understood that the glass substrates disclosed herein are not limited to Corning® Gorilla Glass® 3, but may be any of the various glass substrates described herein or well known in the art, such as amorphous substrates, crystalline substrates, or combinations thereof.

[0222] The various features described in the specification can be combined in any and all combinations, such as those listed in the following examples.

[0223] Example 1. A cover plate article for a sensor includes: a substrate comprising an outer main surface and an inner main surface, wherein the outer main surface and the inner main surface are opposite to each other; and an outer layer film comprising an outermost surface disposed on the outer main surface or the inner main surface of the substrate. The outer layer film comprises a plurality of alternating high refractive index layers and low refractive index layers. The refractive index of each high refractive index layer is greater than the refractive index of each low refractive index layer. The cover plate article has at least two non-overlapping wavelength bands, each band having a bandwidth of 5 nm to 200 nm and a center wavelength in a spectrum of 400 nm to 1200 nm. Further, the cover plate article exhibits that: for each of the at least two non-overlapping wavelength bands, (a) in Up to 2 The average double-surface transmittance is greater than 70% within the incident angle range, and (b) in 2 Up to 9 The average double-surface transmittance is less than 50% within the incident angle range.

[0224] Example 2. A cover plate article according to Example 1 is provided, wherein the at least two non-overlapping wavelength bands are three (3) non-overlapping wavelength bands, each having a bandwidth of 5 nm to 200 nm in a spectrum from 400 nm to 1200 nm.

[0225] Example 3. A cover plate article according to Example 2 is provided, wherein the center wavelength of the first non-overlapping wavelength band is 450 nm to 590 nm, the center wavelength of the second non-overlapping wavelength band is 600 nm to 750 nm, and the center wavelength of the third non-overlapping wavelength band is 800 nm to 1200 nm.

[0226] Example 4. A cover plate article according to any one of Examples 1 to 3 is provided, wherein the high refractive index layer comprises nitride, oxynitride, TiO2, Nb2O5, Ta2O5 or ZrO2, the low refractive index layer comprises oxide, and one of the low refractive index layers is in direct contact with the main surface on the substrate on which the outer layer film is disposed.

[0227] Example 5. A cover plate article according to any one of Examples 1 to 4 is provided, wherein the physical thickness of the substrate is from about 50 μm to 5000 μm, and the physical thickness of the outer layer film is from about 500 nm to about 12,000 nm.

[0228] Example 6. A cover plate article according to any one of Examples 1 to 5 is provided, wherein the outer layer film further comprises a capping layer comprising an oxide and a physical thickness of 5 nm to 200 nm.

[0229] Example 7. A cover plate article according to any one of Examples 1 to 6 is provided, wherein the outer layer film exhibits a hardness of at least 8 GPa as measured by a Glass indenter hardness test from the outermost surface of the outer layer film to a depth of about 100 nm to about 500 nm.

[0230] Example 8. A cover plate article according to any one of Examples 1 to 7 is provided, wherein the cover plate article further exhibits one of the following: i) as by a > 10 gives the bisurface reflection color (CIE 1964), which is determined by using a D65 illuminator on Up to 1 ii) as measured near normal incidence; < +5 gives the bisurface reflection color (CIE 1964), which is determined using a D65 illuminator. Up to 1 Measured under near-normal incidence; and iii) such as by -15 < a < +5 and -15 < b < +15 gives the bisurface reflection color (CIE 1964), which is determined using a D65 illuminator. Up to 9 Measured under any incident light.

[0231] Example 9. A cover plate article according to any one of Examples 1 to 8 is provided, wherein the plurality of alternating high refractive index layers and low refractive index layers are at least 22 layers, and the physical thickness of more than ten (10) high refractive index layers is greater than 100 nm.

[0232] Example 10. A cover plate article according to any one of Examples 1 to 9 is provided, wherein the physical thickness of the outermost high refractive index layer is greater than 150 nm.

[0233] Example 11. A cover plate article according to any one of Examples 1 to 10 is provided, wherein the outermost physical thickness of the outer layer film comprises a high refractive index material of more than 50%.

[0234] Example 11a. A cover plate article according to any one of Examples 1 to 11, wherein the cover plate article exhibits that, for each of the at least two non-overlapping wavelength bands, (a) in Up to 1 Within the incident angle range or Up to 2 The average double-surface transmittance is greater than 85% within the incident angle range, and (b) in 3 Up to 9 Within the incident angle range or 5 Up to 9 The average double-surface transmittance is less than 30% within the incident angle range.

[0235] Example 11b. A cover plate article according to any one of Examples 1 to 11a, wherein the cover plate article exhibits at least three (3) non-overlapping wavelength bands, wherein the cover plate article exhibits that, for each of the at least three non-overlapping wavelength bands, (a) in Up to 1 Within the incident angle range or Up to 2 The average double-surface transmittance is greater than 85% within the incident angle range, and (b) in 3 Up to 9 Within the incident angle range or 5 Up to 9 The average double-surface transmittance is less than 30% within the incident angle range.

[0236] Example 12. A cover article for a sensor is provided, wherein the sensor is a biosensor, and the cover article according to any one of Examples 1 to 11 is included in a smartwatch, and further, wherein the smartwatch includes at least two light emitters, the wavelengths of the at least two light emitters being substantially the same as the center wavelength of the at least two non-overlapping wavelength bands.

[0237] Example 13. A cover plate article for a sensor includes: a substrate comprising an outer main surface and an inner main surface, wherein the outer main surface and the inner main surface are opposite to each other; and an outer layer film comprising an outermost surface disposed on the outer main surface or the inner main surface of the substrate. The outer layer film comprises a plurality of alternating high-refractive-index layers and low-refractive-index layers. Each of the low-refractive-index layers comprises silicon oxide. Each of the high-refractive-index layers comprises silicon nitride, silicon oxynitride, TiO2, Nb2O5, Ta2O5, or ZrO2, and the refractive index of each of the high-refractive-index layers is greater than the refractive index of each of the low-refractive-index layers. The total physical thickness of the outer layer film is from about 500 nm to 12,000 nm. The outer layer film comprises a plurality of periods (N), each period (N) comprising a low-refractive-index layer and a high-refractive-index layer, and the plurality of periods (N) is from 5 to 100 periods. The cover plate article has at least two non-overlapping wavelength bands, each band having a bandwidth of 5 nm to 200 nm and a center wavelength in the spectrum of 400 nm to 1200 nm. Further, the cover plate article exhibits that, for each of the at least two non-overlapping wavelength bands, (a) in Up to 2 The average double-surface transmittance is greater than 70% within the incident angle range, and (b) in 2 Up to 9 The average double-surface transmittance is less than 50% within the incident angle range.

[0238] Example 14. A cover plate article according to Example 13 is provided, wherein the at least two non-overlapping wavelength bands are three (3) non-overlapping wavelength bands, each having a bandwidth of 5 nm to 200 nm in a spectrum from 400 nm to 1200 nm.

[0239] Example 15. A cover plate article according to Example 14 is provided, wherein the center wavelength of the first non-overlapping wavelength band is 450 nm to 590 nm, the center wavelength of the second non-overlapping wavelength band is 600 nm to 750 nm, and the center wavelength of the third non-overlapping wavelength band is 800 nm to 1200 nm.

[0240] Example 16. A cover plate article according to any one of Examples 13 to 15 is provided, wherein the first low refractive index layer in the low refractive index layer comprises an oxide, is in direct contact with the main surface on which the outer layer film is disposed on the substrate, and has a physical thickness of 15 nm to 40 nm.

[0241] Example 17. A cover plate article according to any one of Examples 13 to 16 is provided, wherein the outer layer film further comprises a capping layer comprising an oxide and a physical thickness of 15 nm to 125 nm.

[0242] Example 18. A cover plate article according to any one of Examples 13 to 17 is provided, wherein the outer layer film exhibits a hardness of at least 8 GPa as measured by a Glass indenter hardness test from the outermost surface of the outer layer film to a depth of about 100 nm to about 500 nm.

[0243] Example 19. A cover plate article according to any one of Examples 13 to 18 is provided, wherein the cover plate article further exhibits one of the following: i) as by a > 10 gives the bisurface reflection color (CIE 1964), which is determined by using a D65 illuminator on Up to 1 ii) as measured near normal incidence; < +5 gives the bisurface reflection color (CIE 1964), which is determined using a D65 illuminator. Up to 1 Measured under near-normal incidence; and iii) such as by -15 < a < +5 and -15 < b < +15 gives the bisurface reflection color (CIE 1964), which is determined using a D65 illuminator. Up to 9 Measured under any incident light.

[0244] Example 20. A cover plate article according to any one of Examples 13 to 19 is provided, wherein the plurality of cycles is 20 to 40 cycles (N).

[0245] Example 21. A cover plate article according to any one of Examples 13 to 20 is provided, wherein the cover plate article exhibits that, for each of the at least two non-overlapping wavelength bands, (a) in Up to 2 The average double-surface transmittance is greater than 90% within the incident angle range, and (b) in 3 Up to 9 The average double-surface transmittance is less than 30% within the incident angle range.

[0246] Example 21a. A cover plate article according to any one of Examples 13 to 21, wherein the cover plate article exhibits that, for each of the at least two non-overlapping wavelength bands, (a) in Up to 1 Within the incident angle range or Up to 2 The average double-surface transmittance is greater than 85% within the incident angle range, and (b) in 3 Up to 9 Within the incident angle range or 5 Up to 9 The average double-surface transmittance is less than 30% within the incident angle range.

[0247] Example 21b. A cover plate article according to any one of Examples 13 to 21, wherein the cover plate article exhibits at least three (3) non-overlapping wavelength bands, wherein the cover plate article exhibits that, for each of the at least three non-overlapping wavelength bands, (a) in Up to 1 Within the incident angle range or Up to 2 The average double-surface transmittance is greater than 85% within the incident angle range, and (b) in 3 Up to 9 Within the incident angle range or 5 Up to 9 The average double-surface transmittance is less than 30% within the incident angle range.

[0248] Example 22. A cover plate article according to any one of Examples 13 to 21b is provided, wherein the physical thickness of the outermost high refractive index layer is greater than 150 nm.

[0249] Example 23. A cover plate article according to any one of Examples 13 to 22 is provided, wherein the outermost physical thickness of the outer layer film comprises a high refractive index material of more than 50%.

[0250] Example 24. A cover article for a sensor is provided, wherein the sensor is a biosensor, and the cover article according to any one of Examples 13 to 23 is included in a smartwatch, and further, wherein the smartwatch includes at least two light emitters, the wavelengths of the at least two light emitters being substantially the same as the center wavelengths of the at least two non-overlapping wavelength bands.

[0251] Example 25. A cover plate article for a sensor includes: a substrate comprising an outer main surface and an inner main surface, wherein the outer main surface and the inner main surface are opposite to each other; and an outer layer film comprising an outermost surface disposed on the outer main surface or the inner main surface of the substrate. The outer layer film comprises a plurality of alternating high refractive index layers and low refractive index layers. Each of the high refractive index layers comprises a nitride, oxynitride, TiO2, Nb2O5, Ta2O5, or ZrO2, and the refractive index of each of the high refractive index layers is greater than the refractive index of each of the low refractive index layers. The outer layer film includes a scratch-resistant layer comprising a nitride, oxynitride, TiO2, Nb2O5, Ta2O5, or ZrO2, and the physical thickness of the outer layer film is from about 150 nm to 10,000 nm. The total physical thickness of the outer layered film is approximately 500 nm to 12,000 nm. The cover plate article has at least two non-overlapping wavelength bands, each band having a bandwidth of 5 nm to 200 nm and a center wavelength in the spectrum of 400 nm to 1200 nm. Further, the cover plate article exhibits that, for each of the at least two non-overlapping wavelength bands, (a) in Up to 2 The average double-surface transmittance is greater than 70% within the incident angle range, and (b) in 2 Up to 9 The average double-surface transmittance is less than 50% within the incident angle range.

[0252] Example 26. A cover plate article according to Example 25 is provided, wherein the at least two non-overlapping wavelength bands are three (3) non-overlapping wavelength bands, each having a bandwidth of 5 nm to 200 nm in a spectrum from 400 nm to 1200 nm.

[0253] Example 27. A cover plate article according to Example 26 is provided, wherein the center wavelength of the first non-overlapping wavelength band is 450 nm to 590 nm, the center wavelength of the second non-overlapping wavelength band is 600 nm to 750 nm, and the center wavelength of the third non-overlapping wavelength band is 800 nm to 1200 nm.

[0254] Example 28. A cover plate article according to any one of Examples 25 to 27 is provided, wherein the first low refractive index layer in the low refractive index layer comprises an oxide, is in direct contact with the main surface on which the outer layer film is disposed on the substrate, and has a physical thickness of 15 nm to 40 nm.

[0255] Example 29. A cover plate article according to any one of Examples 25 to 28 is provided, wherein the outer layer film further comprises a capping layer comprising an oxide and a physical thickness of 5 nm to 200 nm.

[0256] Example 30. A cover plate article according to any one of Examples 29 is provided, wherein the physical thickness of the scratch-resistant layer is 400 nm to 4000 nm, and the scratch-resistant layer is in contact with the cover layer.

[0257] Example 31. A cover plate article according to any one of Examples 25 to 30 is provided, wherein the outer layer film exhibits a hardness of at least 8 GPa as measured by a Glass indenter hardness test from the outermost surface of the outer layer film to a depth of about 100 nm to about 500 nm.

[0258] Example 32. A cover plate article according to any one of Examples 25 to 31 is provided, wherein the cover plate article further exhibits one of the following: i) as by a > 10 gives the bisurface reflection color (CIE 1964), which is determined by using a D65 illuminator on Up to 1 ii) as measured near normal incidence; < +5 gives the bisurface reflection color (CIE 1964), which is determined using a D65 illuminator. Up to 1 Measured under near-normal incidence; and iii) such as by -15 < a < +5 and -15 < b < +15 gives the bisurface reflection color (CIE 1964), which is determined using a D65 illuminator. Up to 9 Measured under any incident light.

[0259] Example 33. A cover plate article according to any one of Examples 25 to 32 is provided, wherein the plurality of alternating high refractive index layers and low refractive index layers are at least 22 layers, and the physical thickness of more than ten (10) high refractive index layers is greater than 100 nm.

[0260] Example 33a. A cover plate article according to any one of Examples 25 to 33, wherein the cover plate article exhibits that, for each of the at least two non-overlapping wavelength bands, (a) in Up to 1 Within the incident angle range or Up to 2 The average double-surface transmittance is greater than 85% within the incident angle range, and (b) in 3 Up to 9 Within the incident angle range or 5 Up to 9 The average double-surface transmittance is less than 30% within the incident angle range.

[0261] According to any one of Examples 25 to 33, the cover plate article exhibits at least three (3) non-overlapping wavelength bands, wherein the cover plate article exhibits that, for each of the at least three non-overlapping wavelength bands, (a) in Up to 1 Within the incident angle range or Up to 2 The average double-surface transmittance is greater than 85% within the incident angle range, and (b) in 3 Up to 9 Within the incident angle range or 5 Up to 9 The average double-surface transmittance is less than 30% within the incident angle range.

[0262] Example 34. A cover article for a sensor is provided, wherein the sensor is a biosensor, and the cover article according to any one of Examples 25 to 33 is included in a smartwatch, and further, wherein the smartwatch includes at least two light emitters, the wavelengths of the at least two light emitters being substantially the same as the center wavelengths of the at least two non-overlapping wavelength bands.

[0263] Example 35. A cover plate article according to any one of Examples 25 to 34 is provided, wherein the physical thickness of the outermost high refractive index layer is greater than 150 nm.

[0264] Example 36. A cover plate article according to any one of Examples 25 to 35 is provided, wherein the outermost physical thickness of the outer layer film comprises a high refractive index material of more than 50%.

[0265] Example 37. A cover plate article for a sensor, the cover plate article comprising: a substrate, the substrate including an outer main surface and an inner main surface, wherein the outer main surface and the inner main surface are opposite to each other; and an outer layer film, the outer layer film including an outermost surface, the outer layer film being disposed on the outer main surface or the inner main surface of the substrate, wherein the outer layer film includes a plurality of alternating high refractive index layers and low refractive index layers, wherein the refractive index of each high refractive index layer is greater than the refractive index of each low refractive index layer, wherein the cover plate article has a transmission wavelength band having a bandwidth of 5 nm to 200 nm and a center wavelength of 510 nm to 590 nm, and further, wherein the cover plate article exhibits that, for the transmission wavelength band, (a) in Up to 1 Within the incident angle range or Up to 2 The average double-surface transmittance is greater than 70% within the incident angle range, and (b) in 3 Up to 9 Within the incident angle range or 5 Up to 9 The average double-surface transmittance is less than 50% within the incident angle range.

[0266] Example 38. A cover plate article according to Example 37, wherein the cover plate article exhibits that, for the transmission wavelength band, (a) in Up to 1 Within the incident angle range or Up to 2 The average double-surface transmittance is greater than 85% within the incident angle range, and (b) in 3 Up to 9 Within the incident angle range or 5 Up to 9 The average double-surface transmittance is less than 30% within the incident angle range.

[0267] Example 38a. A cover plate article according to Example 37, wherein the cover plate article has at least two (2) non-overlapping wavelength bands, wherein the cover plate article exhibits that, for each of the at least two non-overlapping wavelength bands, (a) in Up to 1 Within the incident angle range or Up to 2 The average double-surface transmittance is greater than 85% within the incident angle range, and (b) in 3 Up to 9 Within the incident angle range or 5 Up to 9 The average double-surface transmittance is less than 30% within the incident angle range.

[0268] Example 38b. A cover plate article according to Example 37, wherein the cover plate article exhibits having at least three (3) non-overlapping wavelength bands, wherein the cover plate article exhibits that: for each of the at least three non-overlapping wavelength bands, (a) in Up to 1 Within the incident angle range or Up to 2 The average double-surface transmittance is greater than 85% within the incident angle range, and (b) in 3 Up to 9 Within the incident angle range or 5 Up to 9 The average double-surface transmittance is less than 30% within the incident angle range.

[0269] Example 38c. A cover plate article according to any one of Examples 37 to 38b, wherein the high refractive index layer comprises one or more of SiNx, SiOxNy, TiO2, Nb2O5, Ta2O5 or ZrO2.

[0270] Example 39. A cover plate article according to any one of Examples 37 to 38, wherein the outer layer film exhibits a hardness of at least 8 GPa as measured by a Glass indenter hardness test from the outermost surface of the outer layer film to a depth of about 100 nm to about 500 nm.

[0271] Example 40. A cover plate article according to any one of Examples 37 to 39, wherein the cover plate article further exhibits one of the following: i) as by a > 10 gives the bisurface reflection color (CIE 1964), which is determined by using a D65 illuminator on Up to 1 ii) as measured near normal incidence; < +5 gives the bisurface reflection color (CIE 1964), which is determined using a D65 illuminator. Up to 1 Measured under near-normal incidence; and iii) such as by -15 < a < +5 and -15 < b < +15 gives the bisurface reflection color (CIE 1964), which is determined using a D65 illuminator. Up to 9 Measured under any incident light.

[0272] Example 41. A cover plate article according to any one of Examples 37 to 40, wherein each of the low refractive index layers exhibits a refractive index (n) in the range of 1.4 to 1.55, and

[0273] Each of the high refractive index layers exhibits a refractive index (n) in the range of 1.75 to 1.99.

[0274] Example 42. A cover plate article according to any one of Examples 37 to 41, wherein each of the low refractive index layers comprises silicon oxide, and each of the high refractive index layers comprises silicon nitride or silicon oxynitride, and the refractive index of each of the high refractive index layers is greater than the refractive index of each of the low refractive index layers, and the total physical thickness of the outer layer film is about 500 nm to 12,000 nm, and the outer layer film comprises a plurality of periods (N), each period (N) comprising a low refractive index layer and a high refractive index layer, and the plurality of periods (N) is 5 to 100 periods.

[0275] Example 43. A cover article for a sensor, wherein the sensor is a biometric sensor, and the cover article according to any one of Examples 37 to 42 is included in a smartwatch, smart ring, smart glasses or other wearable device.

Claims

1. A cover plate article comprising: A substrate, the substrate comprising an outer main surface and an inner main surface, wherein the outer main surface and the inner main surface are opposite to each other; and An outer layer film, comprising an outermost surface, is disposed on the outer main surface or the inner main surface of the substrate. The outer layered film comprises multiple alternating high-refractive-index layers and low-refractive-index layers. The refractive index of each high-refractive-index layer in the high-refractive-index layers is greater than the refractive index of each low-refractive-index layer in the low-refractive-index layers. The cover plate article described herein has at least two non-overlapping wavelength bands, each band having a bandwidth of 5 nm to 200 nm and a center wavelength in the spectrum of 400 nm to 1200 nm, and Furthermore, wherein the cover plate article exhibits that, for each of the at least two non-overlapping wavelength bands, (a) in Up to 2 The average double-surface transmittance is greater than 70% within the incident angle range, and (b) in 2 Up to 9 The average double-surface transmittance is less than 50% within the incident angle range.

2. The cover plate article according to claim 1, wherein the at least two non-overlapping wavelength bands are three (3) non-overlapping wavelength bands, each band having a bandwidth of 5 nm to 200 nm in the spectrum from 400 nm to 1200 nm.

3. The cover plate article according to claim 2, wherein the center wavelength of the first non-overlapping wavelength band is 450 nm to 590 nm, the center wavelength of the second non-overlapping wavelength band is 600 nm to 750 nm, and the center wavelength of the third non-overlapping wavelength band is 800 nm to 1200 nm.

4. The cover plate article according to any one of claims 1 to 3, wherein the high refractive index layer comprises a nitride, an oxynitride, TiO2, Nb2O5, Ta2O5 or ZrO2, the low refractive index layer comprises an oxide, and one of the low refractive index layers is in direct contact with the main surface on which the outer layer film is disposed on the substrate.

5. The cover plate article according to any one of claims 1 to 4, wherein the physical thickness of the substrate is from about 50 μm to 5000 μm, and the physical thickness of the outer layer film is from about 500 nm to about 12,000 nm.

6. The cover plate article according to any one of claims 1 to 5, wherein the outer layer film further comprises a sealing layer, the sealing layer comprising an oxide and a physical thickness of 5 nm to 200 nm.

7. The cover plate article according to any one of claims 1 to 6, wherein the outer layer film exhibits a hardness of at least 8 GPa as measured by a Berkovich Indenter Hardness Test from the outermost surface of the outer layer film to a depth of about 100 nm to about 500 nm.

8. The cover plate article according to any one of claims 1 to 7, wherein the cover plate article further exhibits one of the following: i) such as through a > 10 gives the bisurface reflection color (CIE 1964), which is determined by using a D65 illuminator on Up to 1 Measurements taken under near-normal incidence; ii) such as through a < +5 gives the bisurface reflection color (CIE 1964), which is determined using a D65 illuminator. Up to 1 Measurements taken under near-normal incidence; as well as iii) If via -15 < a < +5 and -15 < b < +15 gives the bisurface reflection color (CIE 1964), which is determined using a D65 illuminator. Up to 9 Measured at any angle of incidence.

9. The cover plate article according to any one of claims 1 to 8, wherein the plurality of alternating high refractive index layers and low refractive index layers are at least 22 layers, and the physical thickness of more than ten (10) high refractive index layers is greater than 100 nm.

10. The cover plate article according to any one of claims 1 to 9, wherein the physical thickness of the outermost high refractive index layer is greater than 150 nm.

11. The cover plate article according to any one of claims 1 to 10, wherein more than 50% of the outermost physical thickness of the outer layer film comprises a high refractive index material.

12. The cover plate article according to any one of claims 1 to 11, wherein the cover plate article exhibits that, for each of the at least two non-overlapping wavelength bands, (a) in Up to 1 Within the incident angle range or Up to 2 The average double-surface transmittance is greater than 85% within the incident angle range, and (b) in 3 Up to 9 Within the incident angle range or 5 Up to 9 The average double-surface transmittance is less than 30% within the incident angle range.

13. The cover plate article according to any one of claims 1 to 11, wherein the cover plate article exhibits at least three (3) non-overlapping wavelength bands, wherein the cover plate article exhibits that, for each of the at least three non-overlapping wavelength bands, (a) in Up to 1 Within the incident angle range or Up to 2 The average double-surface transmittance is greater than 85% within the incident angle range, and (b) in 3 Up to 9 Within the incident angle range or 5 Up to 9 The average double-surface transmittance is less than 30% within the incident angle range.

14. A cover plate article comprising: A substrate, the substrate comprising an outer main surface and an inner main surface, wherein the outer main surface and the inner main surface are opposite to each other; and An outer layer film, comprising an outermost surface, is disposed on the outer main surface or the inner main surface of the substrate. The outer layered film comprises multiple alternating high-refractive-index layers and low-refractive-index layers. Each of the low-refractive-index layers comprises silicon oxide. Each of the high-refractive-index layers comprises silicon nitride, silicon oxynitride, TiO2, Nb2O5, Ta2O5, or ZrO2, and the refractive index of each of the high-refractive-index layers is greater than the refractive index of each of the low-refractive-index layers. The total physical thickness of the outer layered film is approximately 500 nm to 12,000 nm. The outer layered film comprises multiple periods (N), each period (N) comprising a low-refractive-index layer and a high-refractive-index layer, and the multiple periods (N) are 5 to 100 periods. The cover plate article described herein has at least two non-overlapping wavelength bands, each band having a bandwidth of 5 nm to 200 nm and a center wavelength in the spectrum of 400 nm to 1200 nm, and Furthermore, wherein the cover plate article exhibits that, for each of the at least two non-overlapping wavelength bands, (a) in Up to 2 The average double-surface transmittance is greater than 70% within the incident angle range, and (b) in 2 Up to 9 The average double-surface transmittance is less than 50% within the incident angle range.

15. The cover plate article according to claim 14, wherein the at least two non-overlapping wavelength bands are three (3) non-overlapping wavelength bands, each having a bandwidth of 5 nm to 200 nm in a spectrum from 400 nm to 1200 nm.

16. The cover plate article according to claim 15, wherein the center wavelength of the first non-overlapping wavelength band is 450 nm to 590 nm, the center wavelength of the second non-overlapping wavelength band is 600 nm to 750 nm, and the center wavelength of the third non-overlapping wavelength band is 800 nm to 1200 nm.

17. The cover plate article according to any one of claims 14 to 16, wherein the first low refractive index layer in the low refractive index layer comprises an oxide, is in direct contact with the main surface on which the outer layer film is disposed on the substrate, and has a physical thickness of 15 nm to 40 nm.

18. The cover plate article according to any one of claims 14 to 17, wherein the outer layer film further comprises a sealing layer comprising an oxide and a physical thickness of 15 nm to 125 nm.

19. The cover plate article according to any one of claims 14 to 18, wherein the outer layer film exhibits a hardness of at least 8 GPa as measured by a Glass indenter hardness test from the outermost surface of the outer layer film to a depth of about 100 nm to about 500 nm.

20. The cover plate article according to any one of claims 14 to 19, wherein the cover plate article further exhibits one of the following: i) such as through a > 10 gives the bisurface reflection color (CIE 1964), which is determined by using a D65 illuminator on Up to 1 Measurements taken under near-normal incidence; ii) such as through a < +5 gives the bisurface reflection color (CIE 1964), which is determined using a D65 illuminator. Up to 1 Measurements taken under near-normal incidence; and iii) If via -15 < a < +5 and -15 < b < +15 gives the bisurface reflection color (CIE 1964), which is determined using a D65 illuminator. Up to 9 Measured at any angle of incidence.

21. The cover plate article according to any one of claims 14 to 20, wherein the plurality of cycles is 20 to 40 cycles (N).

22. The cover plate article according to any one of claims 14 to 21, wherein the cover plate article exhibits that, for each of the at least two non-overlapping wavelength bands, (a) in Up to 2 The average double-surface transmittance is greater than 90% within the incident angle range, and (b) in 3 Up to 9 The average double-surface transmittance is less than 30% within the incident angle range.

23. The cover plate article according to any one of claims 14 to 21, wherein the cover plate article exhibits that, for each of the at least two non-overlapping wavelength bands, (a) in Up to 1 Within the incident angle range or Up to 2 The average double-surface transmittance is greater than 85% within the incident angle range, and (b) in 3 Up to 9 Within the incident angle range or 5 Up to 9 The average double-surface transmittance is less than 30% within the incident angle range.

24. The cover plate article according to any one of claims 14 to 21, wherein the cover plate article exhibits at least three (3) non-overlapping wavelength bands, wherein the cover plate article exhibits that, for each of the at least three non-overlapping wavelength bands, (a) in Up to 1 Within the incident angle range or Up to 2 The average double-surface transmittance is greater than 85% within the incident angle range, and (b) in 3 Up to 9 Within the incident angle range or 5 Up to 9 The average double-surface transmittance is less than 30% within the incident angle range.

25. The cover plate article according to any one of claims 14 to 24, wherein the physical thickness of the outermost high refractive index layer is greater than 150 nm.

26. The cover plate article according to any one of claims 14 to 24, wherein more than 50% of the outermost physical thickness of the outer layer film comprises a high refractive index material.

27. A cover plate article comprising: A substrate, the substrate comprising an outer main surface and an inner main surface, wherein the outer main surface and the inner main surface are opposite to each other; and An outer layer film, comprising an outermost surface, is disposed on the outer main surface or the inner main surface of the substrate. The outer layered film comprises multiple alternating high-refractive-index layers and low-refractive-index layers. Each of the high-refractive-index layers comprises a nitride, oxynitride, TiO2, Nb2O5, Ta2O5, or ZrO2, and the refractive index of each of the high-refractive-index layers is greater than the refractive index of each of the low-refractive-index layers. The outer layered film includes a scratch-resistant layer comprising nitride, oxynitride, TiO2, Nb2O5, Ta2O5, or ZrO2, and the physical thickness of the outer layered film is approximately 150 nm to 10,000 nm. The total physical thickness of the outer layered film is approximately 500 nm to 12,000 nm. The cover plate article described herein has at least two non-overlapping wavelength bands, each band having a bandwidth of 5 nm to 200 nm and a center wavelength in the spectrum of 400 nm to 1200 nm, and Furthermore, wherein the cover plate article exhibits that, for each of the at least two non-overlapping wavelength bands, (a) in Up to 2 The average double-surface transmittance is greater than 70% within the incident angle range, and (b) in 2 Up to 9 The average double-surface transmittance is less than 50% within the incident angle range.

28. The cover plate article according to claim 27, wherein the at least two non-overlapping wavelength bands are three (3) non-overlapping wavelength bands, each having a bandwidth of 5 nm to 200 nm in a spectrum from 400 nm to 1200 nm.

29. The cover plate article according to claim 28, wherein the center wavelength of the first non-overlapping wavelength band is 450 nm to 590 nm, the center wavelength of the second non-overlapping wavelength band is 600 nm to 750 nm, and the center wavelength of the third non-overlapping wavelength band is 800 nm to 1200 nm.

30. The cover plate article according to any one of claims 27 to 29, wherein the first low refractive index layer in the low refractive index layer comprises an oxide, is in direct contact with the main surface on which the outer layer film is disposed on the substrate, and has a physical thickness of 15 nm to 40 nm.

31. The cover plate article according to any one of claims 27 to 30, wherein the outer layer film further comprises a sealing layer comprising an oxide and a physical thickness of 5 nm to 200 nm.

32. The cover plate article according to claim 31, wherein the physical thickness of the scratch-resistant layer is 400 nm to 4000 nm, and the scratch-resistant layer is in contact with the sealing layer.

33. The cover plate article according to any one of claims 27 to 32, wherein the outer layer film exhibits a hardness of at least 8 GPa as measured by a Glass indenter hardness test from the outermost surface of the outer layer film to a depth of about 100 nm to about 500 nm.

34. The cover plate article according to any one of claims 27 to 33, wherein the cover plate article further exhibits one of the following: i) such as through a > 10 gives the bisurface reflection color (CIE 1964), which is determined by using a D65 illuminator on Up to 1 Measurements taken under near-normal incidence; ii) such as through a < +5 gives the bisurface reflection color (CIE 1964), which is determined using a D65 illuminator. Up to 1 Measurements taken under near-normal incidence; and iii) If via -15 < a < +5 and -15 < b < +15 gives the bisurface reflection color (CIE 1964), which is determined using a D65 illuminator. Up to 9 Measured at any angle of incidence.

35. The cover plate article according to any one of claims 27 to 34, wherein the plurality of alternating high refractive index layers and low refractive index layers are at least 22 layers, and the physical thickness of more than ten (10) high refractive index layers is greater than 100 nm.

36. The cover plate article according to any one of claims 27 to 35, wherein the physical thickness of the outermost high refractive index layer is greater than 150 nm.

37. The cover plate article according to any one of claims 27 to 36, wherein more than 50% of the outermost physical thickness of the outer layer film comprises a high refractive index material.

38. The cover plate article according to any one of claims 27 to 37, wherein the cover plate article exhibits that, for each of the at least two non-overlapping wavelength bands, (a) in Up to 1 Within the incident angle range or Up to 2 The average double-surface transmittance is greater than 85% within the incident angle range, and (b) in 3 Up to 9 Within the incident angle range or 5 Up to 9 The average double-surface transmittance is less than 30% within the incident angle range.

39. The cover plate article according to any one of claims 27 to 37, wherein the cover plate article exhibits at least three (3) non-overlapping wavelength bands, wherein the cover plate article exhibits that, for each of the at least three non-overlapping wavelength bands, (a) in Up to 1 Within the incident angle range or Up to 2 The average double-surface transmittance is greater than 85% within the incident angle range, and (b) in 3 Up to 9 Within the incident angle range or 5 Up to 9 The average double-surface transmittance is less than 30% within the incident angle range.

40. A cover plate article comprising: A substrate, the substrate comprising an outer main surface and an inner main surface, wherein the outer main surface and the inner main surface are opposite to each other; and An outer layer film, comprising an outermost surface, is disposed on the outer main surface or the inner main surface of the substrate. The outer layered film comprises multiple alternating high-refractive-index layers and low-refractive-index layers. The refractive index of each high-refractive-index layer in the high-refractive-index layers is greater than the refractive index of each low-refractive-index layer in the low-refractive-index layers. The cover plate article described herein has a transmission wavelength band having a bandwidth of 5 nm to 200 nm and a center wavelength of 510 nm to 590 nm. Furthermore, wherein the cover plate article exhibits that, for the transmission wavelength band, (a) in Up to 1 Within the incident angle range or Up to 2 The average double-surface transmittance is greater than 70% within the incident angle range, and (b) in 3 Up to 9 Within the incident angle range or 5 Up to 9 The average double-surface transmittance is less than 50% within the incident angle range.

41. The cover plate article according to claim 40, wherein the cover plate article exhibits that, for the said transmission wavelength band, (a) in Up to 1 Within the incident angle range or Up to 2 The average double-surface transmittance is greater than 85% within the incident angle range, and (b) in 3 Up to 9 Within the incident angle range or 5 Up to 9 The average double-surface transmittance is less than 30% within the incident angle range.

42. The cover plate article of claim 40, wherein the cover plate article has at least two (2) non-overlapping wavelength bands, wherein the cover plate article exhibits that, for each of the at least two non-overlapping wavelength bands, (a) in Up to 1 Within the incident angle range or Up to 2 The average double-surface transmittance is greater than 85% within the incident angle range, and (b) in 3 Up to 9 Within the incident angle range or 5 Up to 9 The average double-surface transmittance is less than 30% within the incident angle range.

43. The cover plate article of claim 40, wherein the cover plate article exhibits having at least three (3) non-overlapping wavelength bands, wherein the cover plate article exhibits that: for each of the at least three non-overlapping wavelength bands, (a) in Up to 1 Within the incident angle range or Up to 2 The average double-surface transmittance is greater than 85% within the incident angle range, and (b) in 3 Up to 9 Within the incident angle range or 5 Up to 9 The average double-surface transmittance is less than 30% within the incident angle range.

44. The cover plate article according to any one of claims 40 to 43, wherein the high refractive index layer comprises one or more of SiNx, SiOxNy, TiO2, Nb2O5, Ta2O5 or ZrO2.

45. The cover plate article according to any one of claims 40 to 44, wherein the outer layer film exhibits a hardness of at least 8 GPa as measured by a Glass indenter hardness test from the outermost surface of the outer layer film to a depth of about 100 nm to about 500 nm.

46. ​​The cover plate article according to any one of claims 40 to 45, wherein the cover plate article further exhibits one of the following: i) such as through a > 10 gives the bisurface reflection color (CIE 1964), which is determined by using a D65 illuminator on Up to 1 Measurements taken under near-normal incidence; ii) such as through a < +5 gives the bisurface reflection color (CIE 1964), which is determined using a D65 illuminator. Up to 1 Measurements taken under near-normal incidence; and iii) If via -15 < a < +5 and -15 < b < +15 gives the bisurface reflection color (CIE 1964), which is determined using a D65 illuminator. Up to 9 Measured at any angle of incidence.

47. The cover plate article according to any one of claims 40 to 46, Each of the low-refractive-index layers exhibits a refractive index (n) in the range of 1.4 to 1.55, and Each of the high refractive index layers exhibits a refractive index (n) in the range of 1.75 to 1.

99.

48. The cover plate article according to any one of claims 40 to 47, Each of the low-refractive-index layers comprises silicon oxide, and Each of the high refractive index layers comprises silicon nitride or silicon oxynitride, and the refractive index of each of the high refractive index layers is greater than the refractive index of each of the low refractive index layers. The total physical thickness of the outer layered film is approximately 500 nm to 12,000 nm, and The outer layered film comprises multiple periods (N), each period (N) comprising a low refractive index layer and a high refractive index layer, and the multiple periods (N) are 5 to 100 periods.

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