Multi-layer stack for screen protection

Abstract

A multilayer stack for protecting a screen is disclosed, which may include a bottom layer, an top layer, and multiple intermediate layers positioned between the bottom and top layers. The multiple intermediate layers may include optically transparent adhesive layers, antirefractive layers, and / or antireflective layers. The multilayer stack may substantially retain its color, plasticity, and / or limit gas release over its use.

Description

Technical Field

[0001] Cross - Reference to Related Applications In the application data sheet or PCT claim filed together with this application, any and all applications in which foreign or domestic priority claims are identified are incorporated herein by reference under 37 CFR 1.57, and Rules 4.18 and 20.6. This application claims the benefit of U.S. Provisional Application No. 63 / 505,321, filed on May 31, 2023, which is incorporated herein by reference in its entirety for all purposes.

[0002] This disclosure relates to a multi - layer stack. More specifically, this disclosure relates to a multi - layer stack for protecting a screen.

Background Art

[0003] Screens may be covered with a protective layer that provides protection from direct trauma (e.g., scratches, cracks, and impacts) and / or contamination (e.g., dust, debris, and fingerprint residue). However, typical protective layers are susceptible to degradation over time due to daily temperature cycles and / or radiation (e.g., solar ultraviolet radiation). Such degradation can cause the protective layer to change color (e.g., yellowing), release gases, create trapped bubbles, lose its plasticity, thereby becoming brittle, more susceptible to cracking or breakage, and / or difficult to remove. For example, a screen protector that was optically clear and colorless when purchased or installed (i.e., new) may discolor over time (e.g., turn yellow), thereby reducing the transmission of light through the screen protector and decreasing clarity and color accuracy. As another example, gas release can form bubbles within the screen protector or between the screen protector and the screen, which can impair optical clarity and / or reduce the physical strength of the screen protector. As a further example, a decrease in the plasticity of the screen protector can cause it to peel off, leading to cracking and / or fracture / tearing of the screen protector into multiple fragments. As yet another example, degradation can cause the screen protector to peel off, leading to the accumulation of residue on the screen.

[0004] This degradation limits the use of such protective layers. [Overview of the project] [Problems that the invention aims to solve]

[0005] For the purpose of summarizing the advantages achieved beyond this disclosure and the prior art, specific purposes and advantages of this disclosure are described herein. Not all such purposes or advantages can be achieved in any particular embodiment. Therefore, for example, a person skilled in the art will recognize that the present invention may be embodied or implemented to achieve or optimize one advantage or set of advantages taught herein, without necessarily achieving other purposes or advantages that may be taught or suggested herein.

[0006] All of these embodiments are intended to be within the scope of the invention disclosed herein. These and other embodiments will be readily apparent to those skilled in the art from the following detailed description of preferred embodiments with reference to the accompanying drawings, and the invention is not limited to any specific preferred embodiment(s) disclosed. [Means for solving the problem]

[0007] In one embodiment, a multilayer stack for protecting a screen is described. The multilayer stack includes a bottom layer, an upper layer, and a plurality of intermediate layers positioned between the bottom and upper layers, the plurality of intermediate layers including an optically transparent adhesive layer.

[0008] In some embodiments, the multilayer stack is optically transparent. In some embodiments, the multilayer stack further includes a release layer located directly beneath the bottom layer. In some embodiments, the intermediate layers include antirefractive layers. In some embodiments, the intermediate layers include polyethylene terephthalate (PET) layers. In some embodiments, the PET layer is a polarizing PET layer. In some embodiments, the polarizing PET layer includes a circular polarizer. In some embodiments, the intermediate layers include a glass layer. In some embodiments, the intermediate layers include an anti-reflective layer. In some embodiments, the device includes a screen and a multilayer stack, the screen located directly beneath the bottom layer. In some embodiments, the screen is a head unit screen. In some embodiments, the vehicle includes the device. In some embodiments, the multilayer stack is configured to withstand exposure to environmental radiation over its service life with substantially no degradation. In some embodiments, the service life is at least about 4 years, at least about 5 years, at least about 6 years, at least about 8 years, or at least about 10 years. In some embodiments, the multilayer stack meets or exceeds the SAE J2527 accelerated exposure criterion. In some embodiments, the multilayer stack is configured to substantially retain its color over its service life. In some embodiments, the multilayer stack is configured not to form bubbles between the stack and the screen over its service life. In some embodiments, the multilayer stack is configured to substantially retain its plasticity over its service life. In some embodiments, the multilayer stack is configured to be easily removable from the glass element 12 years after being placed directly on the glass element without leaving any residue on the glass element. In some embodiments, the method of applying the screen protector to the screen includes placing the multilayer stack on the screen. In some embodiments of the method, the multilayer stack further includes a release layer placed directly beneath the bottom layer, and further includes removing the release layer from the multilayer stack before placing the multilayer stack on the screen.

[0009] In another embodiment, a multilayer stack for protecting a screen is described. The multilayer stack includes a silicon-based layer, a refractive index layer positioned directly above the silica gel layer, an optically transparent adhesive layer positioned directly above the refractive index layer, a tempered glass layer positioned directly above the optically transparent adhesive layer, and an anti-fingerprint layer positioned directly above the tempered glass layer.

[0010] In some embodiments, the tempered glass layer contains silver ions. In some embodiments, the multilayer stack further includes an antimicrobial, anti-fingerprint layer disposed on the tempered glass layer. In some embodiments, the tempered glass layer has anti-glare properties. In some embodiments, the anti-reflective layer is disposed directly on top of the tempered glass layer. In some embodiments, the optically clear adhesive layer is configured to withstand exposure to environmental radiation over its service life with substantially no degradation. In some embodiments, the optically clear adhesive layer meets or exceeds the SAE J2527 accelerated exposure criteria.

[0011] Refer to the attached drawings for a detailed explanation. The use of the same reference number in different drawings indicates the same or identical item.

[0012] In this description, the devices and systems shown in the figures are shown as having a large number of components. Various implementations of the devices and / or systems described herein may include fewer components and may be within the scope of this disclosure. Alternatively, other implementations of the devices and / or systems may include further components or various combinations of the components described and may be within the scope of this disclosure.

[0013] These and other embodiments will become apparent from the following description and accompanying drawings of preferred embodiments intended to illustrate the present invention and not to limit it. [Brief explanation of the drawing]

[0014] [Figure 1A]Exploded view of a multilayer stack for protecting a screen, having a high-definition finish enhanced glass layer, according to one embodiment.

[0015] [Figure 1B] Exploded view of a multilayer stack for protecting a screen, having a matte finish enhanced glass layer, according to one embodiment.

[0016] [Figure 1C] Exploded view of a multilayer stack for protecting a screen, having a high-definition finish enhanced glass layer and a linear polarizing polyethylene terephthalate (PET) layer, according to one embodiment.

[0017] [Figure 1D] Exploded view of a multilayer stack for protecting a screen, having a matte finish enhanced glass layer and a linear polarizing polyethylene terephthalate (PET) layer, according to one embodiment.

[0018] [Figure 1E] Exploded view of a multilayer stack for protecting a screen, having a 9H enhanced glass layer, according to one embodiment.

[0019] [Figure 1F] Exploded view of a multilayer stack for protecting a screen, having 9H enhanced glass with anti-glare properties, according to one embodiment.

[0020] [Figure 1G] Exploded side view of a multilayer stack for protecting a screen, having an anti-reflection layer, according to one embodiment.

[0021] [Figure 2A] Photographic image comparing off-screen indirect reflections with and without a multilayer stack, according to an embodiment.

[0022] [Figure 2B]A photographic image comparing indirect reflections between the on-screen and the blue screen with and without a multilayer stack according to an embodiment.

[0023] [Figure 2C] A photographic image comparing indirect reflections between the on-screen and the multi-color screen with and without a multilayer stack according to an embodiment.

[0024] [Figure 3A] A photographic image comparing direct reflections (e.g., glare) on the screen with and without a multilayer stack according to an embodiment. [Figure 3B] A photographic image comparing direct reflections (e.g., glare) on the screen with and without a multilayer stack according to an embodiment. [Figure 3C] A photographic image comparing direct reflections (e.g., glare) on the screen with and without a multilayer stack according to an embodiment.

Mode for Carrying Out the Invention

[0025] This disclosure can be understood by referring to the following detailed description. Note that for the purpose of clarity, specific elements in the various drawings are not drawn to scale, are represented schematically or conceptually, or otherwise do not exactly correspond to the specific physical configurations of the embodiments.

[0026] Embodiments of the present disclosure relate to multilayer stacks for protecting a screen, comprising an optically transparent adhesive (OCA) positioned between the bottom and top layers. In some embodiments, the multilayer stack may include one or more further layers selected from a silicon-based layer (e.g., silica gel and / or silicone adhesive), an antirefractive layer (e.g., triacetate cellulose (TAC) and / or polyethylene terephthalate (PET) (e.g., polarized PET)), glass (e.g., tempered glass, e.g., ACG glass), an anti-reflective layer, a release layer and / or an anti-fingerprint material. In some embodiments, the multilayer stack may include one or more intermediate layers positioned between the top and bottom layers, comprising silica gel, polyethylene terephthalate (PET) (e.g., polarized PET) and / or glass (e.g., tempered glass). In some embodiments, the multilayer stack may include one or more intermediate layers positioned between the top and bottom layers, comprising a silicon-based layer, an antirefractive layer, glass (e.g., tempered glass), and / or an anti-reflective layer. In some embodiments, the multilayer stack provides protection from direct trauma (e.g., scratches, cracks, and shattering) and / or contamination (e.g., dust, dirt, and fingerprint residue). In some embodiments, the multilayer stack may be applied reversibly or irreversibly to a screen or other glass element. In some embodiments, the multilayer stack is optically transparent and / or colorless, or substantially optically transparent and / or colorless.

[0027] In some embodiments, the multilayer stack includes a silicon-based layer. In some embodiments, the silicon-based layer is selected from silica gel, silicone adhesive, and combinations thereof. In some embodiments, the bottom layer of the multilayer stack includes a silicon-based layer. In some embodiments, the silicon-based layer is located on or directly above the bottom layer of the multilayer stack. In some embodiments, the silicon-based layer is located between the bottom and top layers of the multilayer stack. In some embodiments, the intermediate layer includes a silicon-based layer. In some embodiments, the silicon-based layer can be located directly above the screen or be the bottom layer of a multilayer stack configured to be located directly above the screen. In some embodiments, the silicon-based layer adheres to the screen. In some embodiments, the silicon-based layer can be removed from the screen on which it is directly placed. In some embodiments, the silicon-based layer is configured to be removable from the screen without leaving, or substantially leaving, any residue of the silicon-based layer deposited on the screen on which it is directly placed. In some embodiments, the silicon-based layer is resistant to degradation (e.g., yellowing, degassing, loss of plasticity) caused by temperature changes (e.g., heating and / or cooling) and / or radiation (e.g., ultraviolet radiation). The ability of components to withstand radiation exposure can be simulated by using accelerated exposure. In some embodiments, the silicon-based layer meets or exceeds vehicle ultraviolet protection standards published by accredited standards organizations such as the Society of Automotive Engineers (SAE) (e.g., SAE J2527 accelerated exposure standard). In some embodiments, the silicon-based layer may have a thickness of 0.01 mm, 0.015 mm, 0.02 mm, 0.025 mm, 0.03 mm, 0.035 mm, 0.04 mm, 0.045 mm, 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.3 mm, 0.5 mm, or 1 mm, or any range between these values, an approximation thereof, at most that value, or at most an approximation thereof.

[0028] In some embodiments, the multilayer stack includes an antirefractive layer. In some embodiments, the antirefractive layer also has anti-reflective properties (e.g., reducing direct reflection, including anti-glare properties). In some embodiments, the antirefractive layer includes a triacetate cellulose (TAC) layer. In some embodiments, the antirefractive layer includes a polyethylene terephthalate (PET) layer. In some embodiments, the antirefractive layer is located between the bottom and top layers of the multilayer stack. In some embodiments, the intermediate layer includes the antirefractive layer. In some embodiments, the antirefractive layer is located on or directly above a silicon-based layer. In some embodiments, the antirefractive layer is colorless or substantially colorless. In some embodiments, the antirefractive layer includes a polarizing PET layer. In some embodiments, examples of the polarizing PET layer may include a circular polarizer, a linear polarizer, a birefringent polarizer, an optical birefringent polarizer, or a combination thereof. In this embodiment, the polarizing PET layer includes a linearly polarizing PET layer. For example, PET can be processed to have desired optical properties such as polarization. In some embodiments, such a polarizer can reduce or eliminate reflections (such as direct reflections, indirect reflections, etc., such as glare) and / or the “rainbow effect” that can be observed by an observer when the observer is wearing polarizing glasses (e.g., polarizing sunglasses). The “rainbow effect” can occur when light from a light source (e.g., a screen) passes through two transparent material layers, and at least one of the materials may generate internal stresses that cause different optical effects for light of different wavelengths. The “rainbow effect” can be seen when viewing a screen through a polarizing lens (e.g., polarizing glasses). In some embodiments, the rainbow effect can be mitigated by transmitting light through a circular polarizer.In some embodiments, the PET layer may have a thickness of 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, or 1 mm, or any range between these values, an approximate value thereof, at most that value, or at most an approximate value thereof.

[0029] The multilayer stack includes an optically transparent adhesive (OCA) layer. In some embodiments, the OCA layer bonds the layer below it to the layer above it. In some embodiments, the OCA layer is located between the bottom and top layers of the multilayer stack. In some embodiments, the intermediate layer includes an OCA layer. In some embodiments, the OCA layer is located on or directly above the antirefractive layer. In some embodiments, the OCA layer is resistant to degradation caused by temperature changes (e.g., heating and cooling) and / or radiation (e.g., ultraviolet radiation). Such degradation can cause the screen protector to lose its color (e.g., turn yellow), degas (e.g., create bubbles within the stack or between the stack and the screen on which the stack is located), or lose its plasticity (e.g., become brittle, and the screen protector may crack or break). The ability of a component to withstand radiation exposure can be simulated by using accelerated exposure. In some embodiments, the OCA layer meets or exceeds vehicle ultraviolet protection standards published by accredited standards organizations such as the Society of Automotive Engineers (SAE). In some embodiments, the OCA layer meets or exceeds SAE standard J2527 and / or SAE standard J2412. Such ability to withstand simulated radiation exposure may contribute to substantial retention of color, reduction of degassing, and substantial retention of plasticity over the service life. In some embodiments, the optically transparent adhesive (OCA) layer is configured to withstand temperature changes and / or radiation exposure for 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 years, or any range of values, approximations thereof, at least those values, or at least approximations thereof, without degradation or substantially degradation. Radiation (e.g., ambient radiation) may include solar radiation, including solar ultraviolet (UV) radiation.In some embodiments, the OCA layer may have a thickness of 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.08 mm, 0.085 mm, 0.09 mm, 0.095 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.15 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, or 1 mm, or any range between these, an approximate value, at most that value, or at most an approximate value.

[0030] In some embodiments, the multilayer stack includes a glass layer. In some embodiments, the top layer is a glass layer. In some embodiments, the glass layer is located between the bottom and top layers of the multilayer stack. In some embodiments, the intermediate layer includes a glass layer. In some embodiments, the glass layer is located on or directly above the OCA layer. In some embodiments, the glass is tempered glass. In some embodiments, the tempered glass is ACG glass. In some embodiments, the glass is high-definition (HD) glass (e.g., HD tempered glass). In other embodiments, the glass is frosted glass (e.g., frosted tempered glass). In some embodiments, the glass has a scratch resistance rating of 9B, 9C, 9D, 9E, 9F, 9G, or 9H, or any range between them, an approximation thereof, at least that value, or at least an approximation thereof. In some embodiments, the glass has a scratch resistance rating of 9H (e.g., tempered 9H glass). In some embodiments, the glass layer contains silver ions and may provide antimicrobial and / or antimicrobial properties. In some embodiments, the glass layer reduces reflection. In some embodiments, the glass layer reduces direct reflection (including, for example, anti-glare properties). In some embodiments, the glass layer reduces indirect reflection (including, for example, anti-reflective properties, which include reducing reflection under bright conditions). In some embodiments, the glass layer includes anti-glare properties and / or anti-reflective properties. In some embodiments, the glass layer may have a thickness of 0.1 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.33 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm or 2 mm, or any range between these, an approximate value, at most that value, or at most an approximate value.

[0031] In some embodiments, the multilayer stack includes an anti-reflective layer. The anti-reflective layer reduces reflection (e.g., direct reflection (i.e., including anti-glare properties) and / or indirect reflection (i.e., including anti-reflective properties, which includes reducing reflection under bright conditions)). In some embodiments, the top layer is the anti-reflective layer. In some embodiments, the anti-reflective layer is located between the bottom and top layers of the multilayer stack. In some embodiments, the intermediate layer includes the anti-reflective layer. In some embodiments, the anti-reflective layer is located on or directly above a glass layer. In some embodiments, the anti-reflective layer is a thin layer of metal. In some embodiments, the anti-reflective layer contains gallium. In some embodiments, the anti-reflective layer is deposited by physical vapor deposition (PVD) technology. In some embodiments, the anti-reflective layer is deposited by magnetron sputtering. In some embodiments, the anti-reflective layer is deposited uniformly or substantially uniformly. In some embodiments, the anti-reflective layer includes anti-reflective and / or anti-glare properties. In some embodiments, the anti-reflective layer may have a thickness of 0.005 mm, 0.006 mm, 0.007 mm, 0.008 mm, 0.009 mm, 0.01 mm, 0.015 mm, 0.02 mm, 0.025 mm, 0.03 mm, 0.033 mm, 0.035 mm, 0.04 mm, or any range of values ​​between these, an approximate value, at most that value, or at most an approximate value.

[0032] This term is used throughout this application, and unless otherwise specified, “reflection” is a general term to describe the phenomenon in which unintended objects are reflected from multilayer stacks and / or screens and are visible to the user. The term “reflection” encompasses both direct and indirect reflection. Direct reflection occurs when the unintended object itself is a light source, such as the sun or a light bulb. An example of direct reflection is glare when an observer of a screen sees a bright spot on the screen, which is a reflection of the sun or a light bulb. Indirect reflection occurs when the unintended object itself is not a light source. An example of indirect reflection is when an observer of a screen sees a reflection of their own face on the screen.

[0033] By definition of “reflection” as provided herein, it will be understood that an anti-reflective coating reduces both direct reflection (e.g., glare) and / or indirect reflection. An anti-reflective coating may also have anti-glare properties. In some embodiments, the anti-reflective coating reduces direct reflection. In some embodiments, the anti-reflective coating reduces indirect reflection.

[0034] In some embodiments, the multilayer stack includes an anti-fingerprint layer. In some embodiments, the top layer is the anti-fingerprint layer. In some embodiments, the anti-fingerprint layer is located on or directly above the glass layer. In other embodiments, the anti-fingerprint layer is located on or directly above the anti-reflective layer. In some embodiments, the anti-fingerprint layer includes an oleophobic material or film. In some embodiments, the anti-fingerprint layer can reduce or minimize the intensity or visibility of fingerprints. In some embodiments, the anti-fingerprint layer can also reduce the occurrence of smudges on the screen. In some embodiments, the anti-fingerprint layer can help to make the multilayer stack easier to clean (e.g., remove contaminants (e.g., dust, debris, and fingerprint residues) from the surface of the multilayer stack). In some embodiments, the anti-fingerprint layer can have antimicrobial (e.g., antimicrobial) properties. In some embodiments, the anti-fingerprint layer may have a thickness of 0.005 mm, 0.007 mm, 0.009 mm, 0.01 mm, 0.011 mm, 0.013 mm, or 0.15 mm, 0.2 mm, 0.3 mm, or 0.5 mm, or any range between these values, an approximation thereof, at most that value, or at most an approximation thereof.

[0035] In some embodiments, the multilayer stack includes a release layer. In some embodiments, the release layer is the bottom layer. In some embodiments, the release layer is located below or directly below the silicon-based layer. In some embodiments, the release layer protects the multilayer stack, such as the silicon-based layer, during transport, and is removed during installation so that a multilayer stack without the release layer can be placed on the screen. In embodiments where the release layer is removed from the multilayer stack, the layer adjacent to the release layer may be called the bottom layer or new bottom layer. In embodiments where the release layer is removed from the multilayer stack, the multilayer stack without the release layer may be called the multilayer stack. In embodiments where the multilayer stack includes a release layer, the multilayer stack with the release layer may be called a coated multilayer stack. In some embodiments, the release layer includes a plastic material. In some embodiments, the release layer is removably bonded to the rest of the multilayer stack by static force (i.e., "static adhesion"). In some embodiments, the release layer is robust enough not to tear or break during removal. In some embodiments, the release layer may have a thickness of 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.075 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.15 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm, or any range between these, an approximate value, at most that value, or at most an approximate value.

[0036] A multilayer stack is configured to be placed on a screen, thereby forming a device. In some embodiments, the bottom layer of the multilayer stack is placed directly above the screen. In some embodiments, examples of screens include mobile devices, monitors embedded in or positioned behind seats (e.g., seats in a vehicle or airplane) (e.g., for computers, televisions or electronic tablets), and / or vehicle head unit screens. In some embodiments, a vehicle head unit can be a user interface, display, and / or control system on / near the vehicle's dashboard. In some embodiments, a vehicle head unit screen may be sensitive to direct human touch (e.g., a "touchscreen") or it may be a static screen. In some embodiments, the multilayer stack does not interfere with the touchscreen functionality of the screen.

[0037] In some embodiments, the multilayer stack does not become brittle after several years of exposure to ultraviolet radiation. The multilayer stack remains bendable and flexible. In some embodiments, the multilayer stack can bend to about 120°, 130°, 140°, 150°, 160°, 170°, 180°, 185°, or 190°, or any range of values ​​in between, at least that value, or at least an approximation thereof. In some embodiments, increasing the bendable flexibility of the multilayer stack reduces or eliminates the possibility that the multilayer stack will break or leave residue on the screen when the multilayer stack is removed.

[0038] In some embodiments, the multilayer stack meets or exceeds vehicle UV protection standards published by accredited standards bodies such as the Society of Automotive Engineers (SAE). In some embodiments, the multilayer stack meets or exceeds SAE standard J2527 and / or SAE standard J2412. In some embodiments, the multilayer stack can increase the resistance of an original equipment manufacturer's (OEM) automotive head unit screen to accelerated UV exposure by 150%, 200%, 300%, 400%, 500%, or 600%, or any range of values ​​between them, an approximation thereof, at least that value, or at least an approximation thereof (e.g., about 100 hours to about 500 hours). Such ability to withstand exposure to simulated radiation may contribute to substantial retention of color, reduced degassing, and substantial retention of plasticity over the service life. In some embodiments, the multilayer stack is configured to withstand temperature changes and / or exposure to radiation for 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 years, or any range of values ​​between those, an approximation thereof, at least that value, or at least that approximation thereof, without degradation (e.g., color change (e.g., yellowing), degassing, and / or loss of plasticity), or without substantial degradation. Radiation (e.g., ambient radiation) may include solar radiation, including solar ultraviolet (UV) radiation. In some embodiments, the multilayer stack is configured to be applied to a screen for 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 years, an approximation thereof, at least that value, or at least that approximation thereof, and then removed from the screen, without leaving any residue (e.g., adhesive residue, silicon-based layer residue, torn portions or fragments of the multilayer stack) on the screen.

[0039] Figure 1A shows an exploded view of a multilayer stack 100A for protecting the screen. In the example shown in Figure 1A, the bottom layer of the multilayer stack 100A is a release layer 102a. Directly above the release layer 102a is a silica gel layer 104a. Directly above the silica gel layer 104a is a polyethylene terephthalate (PET) layer 106a. Directly above the PET layer 106a is an optically transparent adhesive (OCA) layer 108a. Directly above the OCA layer 108a is a tempered glass layer 110a. In the example shown in Figure 1A, the tempered glass layer 110a is a high-definition tempered glass layer implanted with antimicrobial silver ions. In some embodiments, "high-definition" refers to the transparency and transmittance of the glass layer. Directly above the tempered glass layer 110a is an anti-fingerprint layer 112a.

[0040] Figure 1B shows an exploded view of a multilayer stack 100B for protecting the screen. In the example shown in Figure 1B, the bottom layer of the multilayer stack 100B is a release layer 102b. Directly above the release layer 102b is a silica gel layer 104b. Directly above the silica gel layer 104b is a polyethylene terephthalate (PET) layer 106b. Directly above the PET layer 106b is an optically transparent adhesive (OCA) layer 108b. Directly above the OCA layer 108b is a tempered glass layer 110b. In the example shown in Figure 1B, the tempered glass layer 110b is a matte-fingerprint tempered glass layer implanted with antimicrobial silver ions. Directly above the tempered glass layer 110b is an anti-fingerprint layer 112b.

[0041] Figure 1C shows an exploded view of a multilayer stack 100C for protecting the screen. In the example shown in Figure 1C, the bottom layer of the multilayer stack 100C is a release layer 102c. Directly above the release layer 102c is a silica gel layer 104c. Directly above the silica gel layer 104c is a linearly polarized polyethylene terephthalate (PET) layer 106c. Directly above the linearly polarized PET layer 106c is an optically transparent adhesive (OCA) layer 108c. Directly above the OCA layer 108c is a tempered glass layer 110c. In the example shown in Figure 1C, the tempered glass layer 110c is a high-definition tempered glass layer implanted with antimicrobial silver ions. Directly above the tempered glass layer 110c is an anti-fingerprint layer 112c.

[0042] Figure 1D shows an exploded view of a multilayer stack 100D for protecting the screen. In the example shown in Figure 1D, the bottom layer of the multilayer stack 100D is a release layer 102d. Directly above the release layer 102d is a silica gel layer 104d. Directly above the silica gel layer 104d is a linearly polarized polyethylene terephthalate (PET) layer 106d. Directly above the linearly polarized PET layer 106d is an optically transparent adhesive (OCA) layer 108d. Directly above the OCA layer 108d is a tempered glass layer 110d. In the example shown in Figure 1D, the tempered glass layer 110d is a matte-fingerprint tempered glass layer implanted with antimicrobial silver ions. Directly above the tempered glass layer 110d is an anti-fingerprint layer 112d.

[0043] Figure 1E shows an exploded view of a multilayer stack 100E for protecting the screen. In the example shown in Figure 1E, the bottom layer of the multilayer stack 100E is a release layer 102e. Directly above the release layer 102e is a silica gel layer 104e. Directly above the silica gel layer 104e is a polyethylene terephthalate (PET) layer 106e. Directly above the PET layer 106e is an optically transparent adhesive (OCA) layer 108e. Directly above the OCA layer 108e is a tempered glass layer 110e. In the example shown in Figure 1E, the tempered glass layer 110e is a tempered 9H glass layer. Directly above the tempered glass layer 110e is an anti-fingerprint layer 112e.

[0044] Figure 1F shows an exploded view of a multilayer stack 100F for protecting the screen. In the example shown in Figure 1F, the bottom layer of the multilayer stack 100F is a release layer 102f. Directly above the release layer 102f is a silica gel layer 104f. Directly above the silica gel layer 104f is a polarized polyethylene terephthalate (PET) layer 106f. Directly above the polarized PET layer 106f is an optically transparent adhesive (OCA) layer 108f. Directly above the OCA layer 108f is a tempered glass layer 110f. In the example shown in Figure 1F, the tempered glass layer 110f is a tempered 9H glass layer with anti-glare properties and implanted with antibacterial silver ions. Directly above the tempered glass layer 110f is an anti-fingerprint layer 112f.

[0045] Figure 1G shows an exploded side view of a multilayer stack 100G for protecting the screen. In the example shown in Figure 1G, the bottom layer of the multilayer stack 100G is a release layer 102g. Directly above the release layer 102g is a silicone adhesive layer 104g. Directly above the silicone adhesive layer 104g is a triacetate cellulose (TAC) layer 106g. Directly above the TAC layer 106g is an optically transparent adhesive (OCA) layer 108g. Directly above the OCA layer 108g is an ACG glass layer 110g. Directly above the ACG glass layer 110g is an anti-reflective layer 114g. Directly above the anti-reflective layer 114g is an anti-fingerprint layer 112g. The anti-fingerprint layer 112g has antibacterial properties.

[0046] In some embodiments, the release layer protects the silicon-based layer (e.g., silica gel and / or silicone adhesive layer) and the rest of the multilayer stack from damage (e.g., scratches) or contamination (e.g., dust, dirt, and fingerprint residue) during transport until installation. In some embodiments, while the multilayer stack is being installed on a substrate (e.g., a single sheet of glass, a screen, a head unit screen), the release layer is separated (e.g., peeled off) from the rest of the multilayer stack, thereby exposing the silicon-based layer. In some embodiments, the rest of the multilayer stack can then be placed on the substrate and / or applied to the substrate. [Examples]

[0047] Example 1 Ten sample multilayer stacks corresponding to Figures 1A to 1F were fabricated and tested. Each of the ten sample multilayer stacks had the following layers and approximate specified thicknesses: a silica gel layer (0.03 mm ± 0.05 mm), a PET layer (0.05 mm + / - 0.03 mm) on top of that, an OCA layer (0.1 mm ± 0.05 mm) on top of that, a tempered glass layer (0.33 mm) on top of that, and an anti-fingerprint layer (0.01 mm) on top of that.

[0048] Six tests were performed on the sample to assess its reliability. The tests and results are shown below.

[0049] 1. Transmittance / Cloudiness The transmittance / cloudiness was tested. The standard for light transmittance testing is 90% or higher. The tested sample showed a transmittance of 91.3%.

[0050] 2. Bending The bending flexibility was tested. The standard for bending flexibility is 180° or more. The tested samples showed bending flexibility exceeding 180°.

[0051] 3. Impact resistance Impact resistance was tested using a drop ball test. A 64-gram metal ball was dropped from a height of 60 cm. All 10 samples passed this test.

[0052] 4. Edge strength and compressive strength Edge strength and compressive strength were tested using edge pressure tests, with data primarily concentrated at the midpoint of the long side. The edge pressure standard was 13 kg. The results for each sample are shown in Table 1 below.

[0053] 5.Initial droplet angle The initial droplet angle was tested. After grinding, friction was performed at the center point. The friction position was marked. The humidity was 55° or less. The steel velvet was not moistened each time it was replaced. The initial droplet angle reference was 110°. The results for each sample are shown in Table 1 below.

[0054] 6. Droplet angle after grinding The water droplet angle after grinding was tested. After the initial droplet test (see Test 5 above), the surface was cleaned using the grinding process. The average of 5 points was tested and recorded. The standard water droplet angle after grinding was 105°. The results for each sample are shown in Table 1 below. [Table 1]

[0055] Example 2 Further sample multilayer stacks matching Figure 1G were fabricated and tested. Each of the tested sample multilayer stacks had the following layers and approximate specified thicknesses: a silicone adhesive layer (0.03 mm ± 0.05 mm), a TAC layer (0.05 mm + / - 0.03 mm) on top of that, an OCA layer (0.1 mm ± 0.05 mm) on top of that, an ACG glass layer (0.33 mm) on top of that, an anti-reflective layer (0.01 mm) on top of that, and an anti-fingerprint layer (0.01 mm) on top of that.

[0056] To test reliability, 14 tests were performed on the samples. All tests were conducted on at least two sample multilayer stacks. All sample multilayer stacks were 14-inch screen protectors.

[0057] 1. UV exposure procedure The resistance to degradation due to ultraviolet (UV) radiation exposure was tested. The industry standard used in this test was SAE J2412. The test was conducted according to the SAE J2412 standard for setup and cycle times. UV exposure was 379.5 kJs for 253 hours. Acceptable standards and test results are shown in Table 2 below.

[0058] 2. Low-temperature operation The operating performance at low temperatures was tested. The industry standard used in this test was TMNA2011 low-temperature tolerance (similar to ISO16750-4 5.1.1.2). The test was conducted by mounting the sample multilayer stack in a radio and operating it at -40°C (-40°F) for 100 hours. The acceptable standards and test results are shown in Table 2 below.

[0059] 3.High temperature operation The operating performance at high temperatures was tested. The industry standard used in this test was TMNA2005 Heat Aging (similar to ISO16750-4 5.1.2.2). The test was performed using a radioscreen as the covering panel. The test was conducted at 85°C for 504 hours to simulate 3 years of aging. The acceptable standards and test results are shown in Table 2 below.

[0060] 4. Thermal shock Thermal shock resistance was tested. The industry standard used in this test was ISO 16750-4 5.3.1. The test was conducted in accordance with ISO 16750-4 5.3.1. The test included 100 thermal cycles. Each thermal cycle involved raising the temperature from -40°C to 80°C within 60 seconds, followed by maintaining thermal stability for 60 minutes. Acceptable standards and test results are shown in Table 2 below.

[0061] 5. Temperature Cycle The operational performance during temperature cycling was tested. The industry standard used in this test was TMNA2001 thermal cycling (similar to ISO16750-4 5.3.1). The test was performed on Group A components, cycling between 100°C and -40°C. The acceptable standards and test results are shown in Table 2 below.

[0062] 6. Humidity Test Moisture resistance was tested. The industry standard used in this test was TMNA2008 moisture resistance (similar to ISO16750-4 5.7). The test was conducted at 70°C and 90% humidity for 100 hours. Acceptable standards and test results are shown in Table 2 below.

[0063] 7. Vibration Test Vibration resistance was tested. The industry standard used in this test was the TMNA3035 vibration test (similar to ISO16750-3 4.1.3.1.5). The test frequency was 5 to 200 Hz over 900 seconds on a 90-degree vertical axis at a temperature of 24.3°C and humidity of 51%. Acceptable standards and test results are shown in Table 2 below.

[0064] 8. Mechanical shock The resistance to mechanical impact was tested. The industry standard used in this test was ISO 16750-3 4.2.2 Mechanical impact test of components at rigid body points of the vehicle body. Each test was conducted at a temperature of 25°C, with a 500 m / s load over 6 ms. 2 The test included 10 impacts of the specified acceleration. Acceptable standards and test results are shown in Table 2 below.

[0065] 9. Scratch test Scratch resistance was tested. The industry standard used for this test was ISO 15184. A Wolff-Wilborn test was performed, including a 500g weight, a 9H pencil, and a rolling speed of 10 mm / s. Five separate locations were tested. Acceptable standards and test results are shown in Table 2 below.

[0066] 10. Chemical Tests Chemical resistance was tested. The industry standard used in this test was TMNA1007 chemical resistance (similar to ISO16750-5 5.1). The test was conducted according to the chemical list for interior components. Acceptable standards and test results are shown in Table 2 below.

[0067] 11. Abrasion Test Abrasion resistance was tested. The test involved rubbing a 2-inch portion of a multilayer stack of samples with a 1-pound weighted cloth. Five samples were rubbed 6,000 times. The rubbing was repeated with damp cloth, jeans, and steel wool. Acceptable standards and test results are shown in Table 2 below.

[0068] 12. Flammability Test Fire resistance was tested. The industry standard used in this test was FMVSS302. The test was conducted according to the prescribed standards. Acceptable standards and test results are shown in Table 2 below.

[0069] 13.3-point bending test Flexibility was tested. The test involved starting the press shaft of the apparatus and gradually pressing the multilayer stack of the sample from three directions (top, left, and right). Pressure was applied slowly to see if the stack could withstand a load of at least 15 kg. Acceptable criteria and test results are shown in Table 2 below.

[0070] 14. Edge Strength Test Edge strength was tested. The test involved pressing a cone head onto the surface of a multilayer stack of samples. The load was gradually increased up to the maximum support load of the sample stack to confirm that the breaking value was at least 6 kg. Acceptable criteria and test results are shown in Table 2 below. [Table 2]

[0071] Example 3 The multilayer stacks of Examples 1 and 2 were also tested for anti-reflective properties. Figures 2A to 2C are annotated photographs showing tests comparing the indirect reflection of a sample on screen 200 with a multilayer stack having an anti-reflective layer, a multilayer stack without an anti-reflective layer, and no multilayer stack. The screen 200 shown in each of Figures 2A to 2C has three distinct domains. Without a multilayer stack to protect the screen 200, the first region 200a of the screen 200 is exposed. The second region 200b of the screen 200 has the first multilayer stack 210 placed on it. The first multilayer stack 210 does not have an anti-reflective layer and is similar to the multilayer stack of Example 1. The third region 200c of the screen 200 has an anti-reflective multilayer stack 220 placed on it. The anti-reflective multilayer stack 220 is the multilayer stack of Example 2. Each of Figures 2A to 2C also shows the indirect reflection of sample:reflective sample 230. The first portion 230a of the reflective sample 230 is seen on the bare screen 200. The second portion 230b of the reflective sample 230 is seen on the first multilayer stack 210 without an anti-reflective layer. The third portion 230c of the reflective sample 230 is seen on the anti-reflective multilayer stack 220 with an anti-reflective layer.

[0072] In Figure 2A, screen 200 is off and black. In Figure 2B, screen 200 is on and blue. In Figure 2C, screen 200 is on and displays multiple colors. Specifically, Figure 2C shows a screen with a navigation application, which is a common test case for many modern screens (e.g., phone screens and / or vehicle head units). In Figures 2B and 2C, both multilayer stacks 210, 220 and sample 230 are outlined in red to enhance the clarity of the boundaries separating the first portion 230a, the second portion 230b, and the third portion 230c of sample 230. As demonstrated by Figures 2A–2C, the anti-reflective multilayer stack exhibits improved indirect anti-reflective properties compared to a bare screen and a multilayer stack without an anti-reflective layer, both when the screen is on and off.

[0073] Figures 3A to 3C are annotated photographs showing a test comparing the direct reflection (e.g., glare) of a light source on a screen 300 with a multilayer stack having an anti-reflective layer, with a multilayer stack without an anti-reflective layer, and with no multilayer stack at all. The screen 300 shown in each of Figures 3A to 3C is the same. The screen 300 shown in each of Figures 3A to 3C displays a navigation application on it, which is a common test case for many modern screens (e.g., phone screens and / or vehicle head units). The screen 300 shown in each of Figures 3A to 3C has three distinct domains. Without a multilayer stack to protect the screen 300, the first region 300a of the screen 300 is exposed. The second region 300b of the screen 300 has a first multilayer stack 310 placed on it. The first multilayer stack 310 does not have an anti-reflective layer and is similar to the multilayer stack of Example 1. A third region 300c of the screen 300 has an anti-reflective multilayer stack 320 placed thereon. The anti-reflective multilayer stack 320 is the multilayer stack of Example 2.

[0074] Figures 3A to 3C each also show direct reflections (e.g., glare) of a light source in different areas of the screen 300. Figure 3A shows a first glare 330a of a light source reflected from the bare screen 300. Figure 3B shows a second glare 330b of a light source reflected from a second area 300b of the screen 300, where part of the screen 300 is protected by a multilayer stack 310 without an anti-reflective layer. Figure 3C shows a third glare 330c of a light source reflected from a third area 300c of the screen 300, where part of the screen 300 is protected by an anti-reflective multilayer stack 320 including an anti-reflective layer. It will be understood that the glares shown in each of Figures 3A to 3C are from the same light source on the same screen with the same brightness. The differences in size and brightness of the first glare 330a, the second glare 330b, and the third glare 330c are due to the characteristics of the multilayer stack. For example, the fact that the second glare 330b is smaller than the first glare 330a is due to the anti-reflective (e.g., anti-glare) properties of the multilayer stack 310, which does not have an additional anti-reflective layer. The fact that the third glare 330c is smaller than the first glare 330a is due to the anti-reflective (e.g., anti-glare) properties of the anti-reflective multilayer stack 320. As demonstrated by Figures 3A to 3C, the anti-reflective multilayer stack exhibits improved direct anti-reflective properties (i.e., anti-glare properties) compared to the bare screen and the first multilayer stack without an anti-reflective layer, both when the screen is on and off. The first multilayer stack also exhibits improved direct anti-reflective properties (i.e., anti-glare properties) compared to the bare screen.

[0075] Unless otherwise explicitly required in the context, words such as “comprise,” “comprising,” “include,” and “including” throughout the specification and claims should be interpreted in a comprehensive sense, as opposed to an exclusive or exhaustive sense, i.e., “including, but not limited to.” The word “coupled” as commonly used herein refers to two or more elements that are directly connected or that can be connected by one or more intermediate elements. Similarly, the word “connected” as commonly used herein refers to two or more elements that are directly connected or that can be connected by one or more intermediate elements. Furthermore, where “herein,” “above,” “below,” and similar words are used in this application, these words refer to the entire application and not to any particular part of it. Furthermore, where the first element is described in this specification as existing “on” or “over” the second element, the first element may exist directly on or over the second element such that the first and second elements are in direct contact, or the first element may exist indirectly on or over the second element such that one or more elements interpose between the first and second elements. Words used singular or plural in the above detailed descriptions may also include plural or singular forms where the context allows. The word “or” when referring to a list of two or more items encompasses all of the following interpretations of the word: any of the items in the list, all of the items in the list, and any combination of the items in the list.

[0076] Furthermore, conditional words used herein, in particular "can," "could," "might," and "may," and "e.g.," "for example," and "such as," are generally intended to convey that some embodiments include certain features, elements, and / or states, while others do not, unless otherwise explicitly stated or understood differently in the context in which they are used. Therefore, such conditional words are not generally intended to imply that features, elements, and / or states are absolutely necessary for one or more embodiments.

[0077] While several embodiments have been described, these embodiments are presented only as examples and are not intended to limit the scope of this disclosure. In fact, the novel devices, methods, and systems described herein can be embodied in a variety of other forms, and various omissions, substitutions, and modifications can be made to the forms of methods and systems described herein without departing from the spirit of this disclosure. For example, while blocks are shown in a given arrangement, other embodiments may perform similar functions using different components and / or circuit topologies, and some blocks may be deleted, moved, added, subdivided, combined, and / or modified. Each of these blocks can be implemented in a variety of different ways. Further embodiments can also be provided by combining any preferred combination of elements and actions of the various embodiments described above. The appended claims and their equivalents are intended to cover forms or modifications that fall within the scope and spirit of this disclosure.

Claims

1. A multi-layer stack for protecting the screen, The lowest level, The top floor, Multiple intermediate layers are arranged between the lowest and uppermost layers. Includes, The uppermost layer is located above the plurality of intermediate layers, and the lowermost layer is located below the plurality of intermediate layers. A multilayer stack in which the plurality of intermediate layers include an optically transparent adhesive layer.

2. The multilayer stack according to claim 1, wherein the multilayer stack is optically transparent.

3. The multilayer stack according to claim 1 or 2, further comprising a delamination layer positioned directly below the bottom layer.

4. The multilayer stack according to any one of claims 1 to 3, wherein the plurality of intermediate layers include a refractive index prevention layer.

5. The multilayer stack according to claim 4, wherein the refractive index prevention layer is a polarizing PET layer.

6. The multilayer stack according to claim 5, wherein the polarizing PET layer includes a circular polarizer.

7. The multilayer stack according to any one of claims 1 to 6, wherein the plurality of intermediate layers further include a glass layer.

8. The multilayer stack according to any one of claims 1 to 7, wherein the plurality of intermediate layers further include an anti-reflective layer.

9. The multilayer stack according to any one of claims 1 to 8, wherein the multilayer stack is configured to prevent the formation of substantially no bubbles between the stack and the screen over its service life.

10. The multilayer stack according to any one of claims 1 to 9, wherein the multilayer stack is configured to withstand exposure to environmental radiation over its service life without substantially degrading.

11. The multilayer stack according to any one of claims 1 to 10, wherein the multilayer stack satisfies or exceeds the SAE J2527 accelerated exposure criteria.

12. The multilayer stack according to any one of claims 1 to 11, wherein the multilayer stack is configured to substantially retain its color over its service life.

13. The multilayer stack according to any one of claims 1 to 12, wherein the multilayer stack is configured to substantially retain its plasticity over its service life.

14. A multilayer stack according to any one of claims 9, 10, 12, or 13, wherein the service life is 5 years.

15. The multilayer stack according to any one of claims 1 to 14, wherein the multilayer stack is configured to be easily removed from the glass element 12 years after being directly placed on the glass element without leaving any residue on the glass element.

16. A device comprising a screen and the multilayer stack described in any one of claims 1 to 15, wherein the screen is located directly below the bottom layer.

17. The device according to claim 16, wherein the screen is a head unit screen.

18. A vehicle comprising the device according to claim 16 or 17.

19. A method for applying a screen protector to a screen, comprising arranging the multilayer stack described in any one of claims 1 to 15 on the screen.

20. The method according to claim 19, further comprising removing the release layer from the multilayer stack before placing the multilayer stack on the screen, wherein the multilayer stack further includes a release layer positioned directly beneath the bottom layer.

21. A multi-layer stack for protecting the screen, Silicon-based layer, A refractive index-preventing layer disposed directly above the aforementioned silicon-based layer, An optically transparent adhesive layer is placed directly above the refractive index-preventing layer, A tempered glass layer is placed directly above the optically transparent adhesive layer, A fingerprint-resistant layer disposed on the tempered glass layer and A multi-layer stack, including a multi-layer stack.

22. The multilayer stack according to claim 21, wherein the multilayer stack further comprises an antimicrobial anti-fingerprint layer disposed on the tempered glass layer.

23. The multilayer stack according to claim 21 or 22, wherein the reinforced glass layer contains silver ions.

24. The multilayer stack according to any one of claims 21 to 23, wherein the tempered glass layer has anti-glare properties.

25. The multilayer stack according to any one of claims 21 to 24, wherein the anti-reflective layer is disposed directly on top of the tempered glass layer.

26. The multilayer stack according to any one of claims 21 to 25, wherein the optically transparent adhesive layer is configured to withstand exposure to environmental radiation for a service life of at least five years without substantially degrading.

27. The multilayer stack according to any one of claims 21 to 26, wherein the optically transparent adhesive layer satisfies or exceeds the SAE J2527 accelerated exposure criteria.

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