Glass article comprising dlc thin film

Abstract

A glass article comprising a DLC thin film is provided. The glass article comprises: a substrate; a base layer formed on the substrate; a DLC (Diamond Like Carbon) layer formed on the base layer; a capping layer formed on the DLC layer; and an AF (Anti-Fingerprint) layer formed on the capping layer.

Description

Technology Field

[0001] The present invention relates to a glass article comprising a DLC thin film, and more specifically, to a glass article exhibiting high physical and chemical durability and optical characteristics by utilizing the low friction coefficient and excellent wear resistance of a DLC (Diamond Like Carbon) thin film. Background Technology

[0002] Recently, the development of information and communication technology, particularly technology related to portable electronic devices, is increasing the demand for high-performance glass products. These high-performance glass products are required to simultaneously possess surface functionalities such as high hardness, scratch resistance, wear resistance, and transparency.

[0003] In order to implement products that satisfy these characteristics, various glass products are being produced using tempered glass with enhanced strength through heat treatment or chemical treatment, or by applying functional thin films such as anti-reflection (AR) coating and anti-fingerprint (AF) coating. However, these coatings do not have sufficient hardness or durability, so there is a problem where their functionality deteriorates due to scratches or wear when used for a long period of time.

[0004] DLC thin films are amorphous carbon-based thin films with high hardness, low coefficient of friction, excellent wear resistance, chemical stability, and optical transparency, and possess properties similar to diamond. It is known that applying DLC ​​thin films to the surface of glass articles can significantly improve mechanical, optical, and chemical properties.

[0005] However, it is not easy to form a thick layer of DLC thin film due to its own internal stress, and when additional functional thin films are applied above and below the DLC thin film, optimizing the adhesion between the DLC thin film and the functional thin film, as well as the optical properties and durability of the entire multilayer thin film, becomes an important task. The problem to be solved

[0006] The technical problem of the present invention is to provide a glass article with a multilayer thin film structure including a DLC thin film that can utilize the low friction coefficient and excellent wear resistance of the DLC thin film.

[0007] The technical problems of the present invention are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0008] A glass article including a DLC thin film according to an embodiment of the present invention for solving the above-described technical problem comprises, in a glass article forming a surface, a substrate; a base layer formed on the substrate; a DLC (Diamond Like Carbon) layer formed on the base layer; a capping layer formed on the DLC layer; and an AF (Anti-Fingerprint) layer formed on the capping layer.

[0009] In some embodiments of the present invention, the base layer may comprise a low refractive index material, and the capping layer may comprise a high refractive index material.

[0010] In some embodiments of the present invention, the average reflectance of the glass article in the 400 nm to 700 nm wavelength range may be 9% or less, and the transmittance at a wavelength of 550 nm may be 87% or more.

[0011] In some embodiments of the present invention, the maximum hardness measured on the surface by an indenter hardness test using a nanoindenter of the glass article may be 10 GPa or more.

[0012] In some embodiments of the present invention, the base layer comprises a high refractive index material, and the thickness of the base layer may be at least 50 nm.

[0013] In some embodiments of the present invention, the maximum hardness measured on the surface by an indenter hardness test using a nanoindenter of the glass article may be 18 GPa or more.

[0014] In some embodiments of the present invention, the base layer may include an anti-reflection structure in which a low-refractive-index layer and a high-refractive-index layer are alternately stacked.

[0015] In some embodiments of the present invention, the average reflectance of the glass article in the 400 nm to 700 nm wavelength range may be 5% or less, and the transmittance at a wavelength of 550 nm may be 90% or more.

[0016] In some embodiments of the present invention, the glass article exhibits a color change of △E < 2.1 when the angle of incidence changes from 8 degrees to 60 degrees, and the bilateral reflectance according to the change in angle of incidence from 8 degrees to 45 degrees has a deviation of less than 1.6 percentage points in the wavelength band of 400 nm to 700 nm, wherein the color change is when the reference point is the color coordinate (a*=0, b*=0). It can be defined as.

[0017] In some embodiments of the present invention, the base layer may include a first anti-reflective layer, a hardness-enhancing layer, and a second anti-reflective layer stacked in sequence.

[0018] In some embodiments of the present invention, the average reflectance of the glass article in the 400 nm to 700 nm wavelength range may be 8.5% or less, and the transmittance at a wavelength of 550 nm may be 90% or more.

[0019] In some embodiments of the present invention, the maximum hardness measured on the surface by an indenter hardness test using a nanoindenter of the glass article may be 18 GPa or more.

[0020] In some embodiments of the present invention, the DLC layer may have a refractive index of 2.1 to 2.4 in the wavelength range of 400 nm to 700 nm.

[0021] In some embodiments of the present invention, the DLC layer may have an absorption coefficient of 0.76 to 0.6 in the wavelength range of 400 nm to 700 nm.

[0022] In some embodiments of the present invention, the ratio of the intensity of the D-band peak to the intensity of the G-band peak (Id / Ig) of the DLC layer may be 1 or greater according to Raman spectroscopy analysis.

[0023] In some embodiments of the present invention, the DLC layer is sp 3 carbon and sp that form a bond 2 The combination ratio may be 1:1 to 1.05:1.

[0024] Specific details of other embodiments are included in the detailed description and drawings. Effects of the invention

[0025] A glass article comprising a DLC thin film according to an embodiment of the present invention can have excellent wear resistance, chemical stability, and optical transparency, along with slip properties due to a low coefficient of friction, by forming a DLC layer. In addition, by providing an anti-reflection structure and a hardness-enhancing structure above and below the DLC layer, it can have further improved reflectivity and transmittance, and excellent hardness measurement results can be obtained even in a maximum hardness test using a nanoindenter.

[0026] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description in the claims. Brief explanation of the drawing

[0027] FIG. 1 is a drawing for explaining the composition of a glass article including a DLC thin film according to some embodiments of the present invention. FIG. 2 is a graph for explaining the optical properties of a DLC layer included in a glass article according to an embodiment of the present invention. FIG. 3 is a graph illustrating the physical properties of a DLC layer. FIG. 4 is a diagram illustrating the composition of a glass article including a DLC thin film according to some other embodiments of the present invention. FIGS. 5a to 5d are drawings for explaining the optical properties of a glass article including the DLC thin film of FIG. 4. FIG. 6 is a drawing for explaining the composition of a glass article including a DLC thin film according to some other embodiments of the present invention. Figure 7 is a drawing for explaining the composition of a glass article including the DLC thin film of Figure 6. FIG. 8 is a drawing for explaining the composition of a glass article including a DLC thin film according to some other embodiments of the present invention. FIGS. 9a to 9c are drawings for explaining the optical properties and hardness properties of a glass article including the DLC thin film of FIG. 8. Specific details for implementing the invention

[0028] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components.

[0029] When one component is referred to as being "connected to" or "coupled to" another component, it includes cases where it is directly connected or coupled to the other component, or cases where another component is interposed. Conversely, when one component is referred to as being "directly connected to" or "directly coupled to" another component, it indicates that no other component is interposed. "And / or" includes each of the mentioned items and all combinations of one or more of them.

[0030] The terms used herein are for describing the embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used herein, "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components, steps, actions, and / or elements to the mentioned components, steps, actions, and / or elements.

[0031] Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another. Therefore, it goes without saying that the "first component" mentioned below may be the "second component" within the technical scope of the present invention.

[0032] Unless otherwise defined, all terms used in this specification (including technical and scientific terms) may be used in a meaning commonly understood by those skilled in the art to which the present invention pertains. Additionally, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise.

[0033] FIG. 1 is a drawing for explaining the composition of a glass article including a DLC thin film according to some embodiments of the present invention.

[0034] Referring to FIG. 1, a glass article including a DLC thin film according to some embodiments of the present invention may include a substrate (100), a base layer (110), a DLC layer (120), a capping layer (130), and an anti-fingerprint layer (150), etc.

[0035] The substrate (100) may include, for example, a glass substrate. Specifically, the substrate (100) may include any one of soda-lime glass, borosilicate glass, aluminosilicate glass, or quartz glass. In addition, the substrate (100) may include a plastic substrate such as polycarbonate or polymethyl methacrylate. The refractive index of the substrate (100) may be about 1.45 to 1.55.

[0036] A base layer (110) may be formed directly on the substrate (100). In some embodiments of the present invention, the base layer (110) may include a low refractive index material, such as SiOx. In this embodiment, the 'low refractive index' material of the base layer (110) may mean having a lower refractive index when compared relative to another thin film layer forming the glass article, such as a capping layer (130) on the DLC layer (120).

[0037] A base layer (110) is formed between the DLC layer (120) and the substrate (100) to reinforce the adhesion between the DLC layer (120) and the substrate (100). When the base layer (110) contains SiOx, the glass substrate (100) and the base layer (110) have similar compositions, so they can have sufficient adhesion, and the adhesion can be improved compared to forming the DLC layer (120) directly on the substrate (100) due to the influence of the surface energy or surface functional groups of SiOx.

[0038] The base layer (110) can perform the role of an anti-reflection layer by having a refractive index between the DLC layer (120) and the substrate (100). That is, since light reflection may be prominent at the interface between the DLC layer (120) and the substrate (100) due to the difference in refractive index between the DLC layer (120) and the substrate (100), the base layer (110) is interposed between the DLC layer (120) and the substrate (100) to reduce reflection on the surface of the substrate (100) and improve transmittance.

[0039] The DLC layer (120) can be formed on the base layer (110). The DLC layer (120) is a diamond-shaped carbon film, sp, which has a graphite structure. 2 and sp, which has a diamond structure 3 It has a mixed structure. Accordingly, the DLC layer (120) can have high hardness, excellent wear resistance, chemical stability, as well as slip properties and optical transparency due to a low coefficient of friction.

[0040] In some embodiments, the DLC layer (120) may include amorphous carbon (aC) or hydrogenated amorphous carbon (aC:H).

[0041] The DLC layer (120) can be formed with a thickness of 2 nm or more. The DLC layer (120) can be formed on the base layer (110) by various sputtering processes, such as DC sputtering, RF sputtering, magnetron sputtering, pulsed DC sputtering, etc.

[0042] The DLC layer (120) may have a higher refractive index than the base layer (110), and may be formed to have a refractive index of 2.0 or higher in the visible light wavelength band, for example. In some embodiments of the present invention, sp included in the DLC layer 3 / sp 2 The refractive index of the DLC layer (120) can be controlled by adjusting the ratio.

[0043] FIG. 2 is a graph for explaining the optical properties of a DLC layer included in a glass article according to an embodiment of the present invention, and FIG. 3 is a graph for explaining the physical properties of a DLC layer.

[0044] Referring to FIG. 2, the refractive index of the DLC layer (120) in the wavelength range of 400 nm to 700 nm may be about 2.1 to 2.4, and in particular, the refractive index at 550 nm is 2.32. It can be confirmed that the absorption coefficient of the DLC layer (120) is measured as 0.76 at 400 nm and is about 0.76 to 0.6 in the wavelength range of 400 nm to 700 nm. Thus, the DLC layer (120) included in the glass article according to the embodiment of the present invention may have a refractive index of 2.0 or higher in the visible light wavelength range, and preferably may be about 2.1 to 2.4. In addition, the DLC layer (120) may have an absorption coefficient of 0.8 or lower in the visible light wavelength range, and preferably may be about 0.76 to 0.6.

[0045] Meanwhile, referring to FIG. 3, a graph of the analysis result by Raman spectroscopy (Fig. 3 (a)) and a graph of the analysis result by XPS (X-ray Photoelectron Spectroscopy) (Fig. 3 (b)) of the DLC layer (120) formed on the base layer (110) are shown.

[0046] According to the Raman spectroscopy analysis results in Fig. 3, 1393.07 cm -1 A peak is measured in the (D-band), at 1582.62 cm -1A peak is measured in the (G-band). At this time, the intensity of the D-band peak (Id) is 419.895 and the intensity of the G-band peak (Ig) is 357.645, so the ratio of the intensity of the D-band peak to the intensity of the G-band peak (Id / Ig) is 1.17. Through these measurement results, it can be seen that the DLC layer (120) is a thin film with strong amorphous characteristics.

[0047] In addition, according to the XPS analysis results in Fig. 3, sp of 285.1 eV 3 Binding energy and sp at 284.6 eV 2 It is measured as binding energy, and sp 3 / sp 2 When looking at the binding energy ratio, sp within the DLC layer (120) 3 carbon and sp that form a bond 2 It can be seen that the ratio of the combination is about 1:1, preferably 1:1 to 1.05:1.

[0048] As such, the DLC layer (120) included in the glass article according to the embodiment of the present invention may have amorphous characteristics such that the ratio of the intensity of the D-band peak to the G-band peak (Id / Ig) is 1 or greater when analyzed by Raman spectroscopy, and sp 3 Carbon and sp 2 The ratio can be about 1:1.

[0049] A capping layer (130) may be formed on the DLC layer (120). The capping layer (130) may include a high refractive index material, such as SiOxNy, for example. As is known, SiOxNy may have high hardness and scratch resistance, and the maximum hardness of the high refractive index layer (130) may be, for example, at least 8 GPa.

[0050] An AF layer (Anti-Fingerprint, 140) may be formed on the capping layer (130). The AF layer (140) may include a fluorine-based compound, such as a fluorinated silane, for example, and may include a fluorine-based polymer in some other embodiments. The AF layer (140) has low surface energy, hydrophobicity, and lipophilicity, which can prevent surface contamination of the glass article.

[0051] The glass article according to the embodiment of FIG. 1 can have a certain degree of hardness and wear resistance by having a DLC layer (120) between the base layer (110) and the capping layer (130), as well as slip properties due to the characteristics of the DLC layer (120).

[0052] FIG. 4 is a drawing for explaining the composition of a glass article including a DLC thin film according to some other embodiments of the present invention.

[0053] Referring to FIG. 4, a glass article including a DLC thin film according to another embodiment of the present invention may include a substrate (200), a base layer (210) having an anti-reflection structure, a DLC layer (220), a capping layer (230), and an AF layer (240).

[0054] The glass article illustrated in FIG. 4 may be distinguished from the glass article previously described using FIG. 1 by having an anti-reflective structure on the base layer (210). The description of common components excluding the base layer (210), which is a difference, is omitted below.

[0055] The base layer (210) may include a plurality of thin films forming an anti-reflection structure. That is, the base layer (210) may include a plurality of thin films formed by alternately stacking a low refractive index layer and a high refractive index layer, and in some embodiments, the plurality of thin films forming the anti-reflection structure of the base layer (210) may include at least four layers of thin films. At this time, the plurality of thin films may be arranged from the substrate (200) in the order of a low refractive index layer / high refractive index layer / low refractive index layer / high refractive index layer, or a high refractive index layer / low refractive index layer / high refractive index layer / low refractive index layer.

[0056] The low refractive index layer included in the anti-reflection structure of the base layer (210) may include one or more materials such as oxides such as SiO2, Al2O3, GeO2, SiO, and MgO, and fluorides such as MgF2, CaF2, BaF2, and LiF.

[0057] The high refractive index layer included in the anti-reflection structure of the base layer (210) is, for example, an oxide such as TiO2, ZrO2, Y2O3, Al2O3, a nitride such as AlN, Si3N4, SiO x N y , AlO x N y It may include one or more substances among oxynitrides such as

[0058] As the base layer (210) is provided with an anti-reflection structure, the optical properties of the glass article of FIG. 4 can be improved. This will be explained using FIG. 5a to 5d.

[0059] FIGS. 5a to 5d are drawings for explaining the optical properties of a glass article including the DLC thin film of FIG. 4.

[0060] First, referring to FIG. 5a, a graph of double-sided reflectance is shown for a glass article (solid line graph) containing an anti-reflection structure in which a low-refractive-index layer and a high-refractive-index layer of FIG. 4 are alternately stacked, and for a glass article (dotted line graph) not containing a separate anti-reflection structure as in FIG. 1. Compared to the glass article of FIG. 1, which shows an average reflectance of 8.88% over a wavelength range of 400 nm to 700 nm, the glass article containing a separate anti-reflection structure shows an average double-sided reflectance of 4.91% and can be seen to exhibit improved anti-reflection performance.

[0061] Referring to FIG. 5b, a graph of the transmittance of each glass article is shown. Compared to the glass article of FIG. 1, which has a transmittance of 87.70% at a wavelength of 550 nm, the glass article of FIG. 4, which includes a separate anti-reflective structure, has a transmittance of 90.45%. As such, it can be seen that the glass article of FIG. 4, which includes an anti-reflective structure, exhibits optical performance in which the average double-sided reflectance in the 400 nm to 700 nm wavelength range decreases by 3.97% and the transmittance in the 550 nm wavelength range increases by 2.75% compared to the glass article of FIG. 1.

[0062] Referring to FIG. 5c, the trend of change in reflected color according to the change in the angle of incidence of the glass article of the embodiment of FIG. 4 is illustrated. The glass article exhibits a color change of △E < 2.1 when the angle of incidence changes from 8 degrees to 60 degrees, where the color change is when the reference point is the color coordinate (a*=0, b*=0). It is defined as.

[0063] In addition, referring to FIG. 5d, the trend of double-sided reflectance according to wavelength bands according to the change in incident angle of the glass article of FIG. 4 is illustrated. Specifically, it can be confirmed that the color uniformity according to the incident and reflection angles is achieved by having a deviation of less than 1.6 percentage points in the wavelength band of 400 nm to 700 nm according to the change in incident angle of 8 to 45 degrees.

[0064] Meanwhile, in the embodiment illustrated in FIG. 4, the optical and physical properties of the DLC layer (220) formed on the base layer (210) may be the same as the DLC layer (120) of the glass article included in the embodiment of FIG. 1.

[0065] FIG. 6 is a drawing for explaining the composition of a glass article including a DLC thin film according to some other embodiments of the present invention.

[0066] Referring to FIG. 6, a glass article including a DLC thin film according to another embodiment of the present invention may include a substrate (300), a base layer (310) having a hardness-enhancing structure, a DLC layer (320), a capping layer (330), and an AF layer (340). The description of common components, excluding the base layer (310) which is a difference, is omitted below.

[0067] The glass article illustrated in FIG. 6 may be distinguished from the glass article previously described using FIG. 1 or FIG. 4 by having a hardness-reinforcing structure in the base layer (310). The description of common components excluding the base layer (310), which is a difference, is omitted below.

[0068] The base layer (310) may include a material for hardness enhancement, for example, oxides such as TiO2, ZrO2, Y2O3, Al2O3, nitrides such as AlN, Si3N4, SiO x N y , AlO x N y It may include one or more materials such as oxynitrides. The base layer (310) may be formed to have a thickness of at least 50 nm, and in some embodiments, the base layer (310) may have a thickness of at least 100 nm. In this way, by forming the base layer (310) with a certain thickness or more using a high-hardness material, a hardness-reinforcing structure may be provided in the base layer (310). The hardness of the glass article of FIG. 5 will be explained using FIG. 6.

[0069] Figure 7 is a diagram illustrating the characteristics of a glass article including the DLC thin film of Figure 6.

[0070] Referring to FIG. 7, the hardness measurement results using a nanoindenter for a glass article containing the hardness-reinforcing structure of FIG. 6 (solid line graph) and a glass article without a separate hardness-reinforcing structure as in FIG. 1 (dotted line graph) are shown. Compared to the glass article of FIG. 1, which shows a maximum hardness of 10.1 GPa when the maximum load is 25 mN, the glass article containing the hardness-reinforcing structure of FIG. 6 shows a maximum hardness of 18.9 GPa, indicating improved hardness. In addition, the glass article containing the hardness-reinforcing structure of FIG. 6 can also have improved performance in Mohs hardness and scratch resistance.

[0071] FIG. 8 is a drawing for explaining the composition of a glass article including a DLC thin film according to some other embodiments of the present invention.

[0072] The glass article illustrated in FIG. 8 may include a first anti-reflective layer (460), a high-hardness layer (410), and a second anti-reflective layer (450) in sequence from the surface of the substrate (400) on the base layer below the DLC layer (420) compared to the glass article previously described using FIG. 1, 4, or 6.

[0073] A glass article having a first anti-reflection layer (460), a high-hardness layer (410), and a second anti-reflection layer (450) on the lower part of a DLC layer (420) can have high hardness and low reflection and high transmittance characteristics compared to glass articles according to the embodiments described above. This is explained using FIGS. 9a to 9c.

[0074] FIGS. 9a to 9c are drawings for explaining the optical properties and hardness properties of a glass article including the DLC thin film of FIG. 8.

[0075] Referring to FIGS. 9a to 9c, a graph of double-sided reflectance (Fig. 9a), a graph of transmittance (Fig. 9b), and a graph of hardness measured using a nanoindenter (Fig. 9c) of a glass article according to the embodiment of FIG. 8 are shown. It can be confirmed that low reflectance, high transmittance, and high hardness performance are achieved, with an average double-sided reflectance of 8.45% in the wavelength band of 400 nm to 700 nm, a transmittance of 90.60% in the 550 nm band, and a maximum hardness of 18.5 GPa.

[0076] Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention may be implemented in other specific forms without changing its technical concept or essential features. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. Explanation of the symbols

[0077] 100, 200, 300, 400: Substrate 110, 210, 310: Base layer 120, 220, 320, 420: DLC floors 130, 230, 330, 430: Capping floors 140, 240, 340, 440: AF layer 410: High-hardness film 450, 460: Anti-reflective coating

Claims

Claim 1 A glass article forming a surface comprises: a substrate; a base layer formed on the substrate; a DLC (Diamond Like Carbon) layer formed on the base layer; a capping layer formed on the DLC layer; and an AF (Anti-Fingerprint) layer formed on the capping layer, wherein the DLC layer is sp 3 carbon and sp that form a bond 2 A glass article comprising a DLC thin film, characterized in that the molar ratio of bonded carbon is 1:1 to 1.05:1, the refractive index is 2.1 to 2.4 and the absorption coefficient is 0.76 to 0.6 in the wavelength range of 400 nm to 700 nm, the ratio of the intensity of the D-band peak to the intensity of the G-band peak (Id / Ig) is 1 or greater according to Raman spectroscopy analysis, the base layer comprises a low refractive index material, and the capping layer comprises a higher refractive index material than the base layer, wherein the refractive index of the base layer is smaller than the refractive index of the DLC layer and the capping layer. Claim 2 delete Claim 3 A glass article comprising a DLC thin film, wherein the average reflectance of the glass article in the 400 nm to 700 nm wavelength band is 9% or less, and the transmittance at a wavelength of 550 nm is 87% or more. Claim 4 A glass article comprising a DLC thin film, wherein, in claim 1, the maximum hardness measured on the surface by an indenter hardness test using a nanoindenter of the glass article is 10 GPa or more. Claim 5 A glass article comprising a DLC thin film, wherein the base layer comprises a high refractive index material and the thickness of the base layer is at least 50 nm or more, in accordance with claim 1. Claim 6 A glass article comprising a DLC thin film, wherein, in claim 5, the maximum hardness measured on the surface by an indenter hardness test using a nanoindenter of the glass article is 18 GPa or higher. Claim 7 A glass article comprising a DLC thin film, wherein the base layer comprises an anti-reflection structure in which a low-refractive-index layer and a high-refractive-index layer are alternately stacked. Claim 8 A glass article comprising a DLC thin film, wherein the average reflectance of the glass article in the 400 nm to 700 nm wavelength band is 5% or less and the transmittance at a wavelength of 550 nm is 90% or more. Claim 9 In claim 7, the glass article exhibits a color change of △E < 2.1 when the angle of incidence changes from 8 degrees to 60 degrees, and the bilateral reflectance according to a change in angle of incidence from 8 degrees to 45 degrees has a deviation of less than 1.6 percentage points in the wavelength band of 400 nm to 700 nm, wherein the color change is when the reference point is the color coordinate (a*=0, b*=0). A glass article comprising a DLC thin film, defined as Claim 10 A glass article comprising a DLC thin film, wherein the base layer comprises a first anti-reflective layer, a hardness-enhancing layer, and a second anti-reflective layer stacked in sequence. Claim 11 A glass article comprising a DLC thin film, wherein the average reflectance of the glass article in the 400 nm to 700 nm wavelength band is 8.5% or less and the transmittance at a wavelength of 550 nm is 90% or more. Claim 12 A glass article comprising a DLC thin film, wherein, in claim 10, the maximum hardness measured on the surface by an indenter hardness test using a nanoindenter of the glass article is 18 GPa or higher. Claim 13 delete Claim 14 delete Claim 15 delete Claim 16 delete

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