Laser decoating of coated glass article

Abstract

The present invention relates to a glass article (A) comprising : a glass sheet (2) comprising a first surface (21) and a second surface (22) opposite to the first surface; and a coating (3) disposed on at least a portion of the second surface of the glass sheet The coating has a perforated zone (5) comprising discrete openings (4) having dimension equal to or lower than 200µm and being spaced from each other by a spacing distance equal to or lower than 200μm (S ≤ 200µm). The spacing distance is characterised by an average spacing and a standard deviation and its standard deviation is equal to or lower than 10% of the average spacing and / or the dimension is characterised by an average dimension and a standard deviation and its standard deviation is equal to or lower than 10% of the average dimension. The first surface comprises at least One optical optical roughened zone (1) positioned in a complementary fashion to the perforated zone; and the glass sheet within the at least One optical optical roughened zone, provides a clarity equal to or lower than 80%, preferably equal to or lower than 50%, more preferably equal to or lower than 30%.

Description

Laser decoating of coated glass articleField of the Invention The present invention relates to coated glass articles with a see-through zone of superior quality andrendering; to can be used as display covers. The glass article comprises a coating wherein a portionthereof has been perforated by laser ablation.Background ArtLaser decoating is a recent technology that is increasingly used in different applications to achieve high resolution decoating patterns. Laser decoating is done by scanning the pulsing laser beam on theglass surface. The decoating can be done in dot or line patterns, in regular or irregular arrays. Thedrawbacks of decoating process in regular patterns are optical artefacts such as diffraction or Moiréeffect.Diffraction occurs when light is diffracted as it passes through or is reflected on the surface of amaterial. The first limitation relates to the regular decoating pattern which behaves like a diffractivegrating and diffracts the light, giving a rainbow effect. This effect is to be avoided since it is detrimentalto the visibility. Moiré effects are large-scale interference patterns that can occur when two repetitivepatterns, such as the pixel pattern of a display screen and the pattern of the decoated zone interact in a way that creates a new, unwanted pattern. For the moiré interference pattern to appear, the two patterns must not be completely identical, but rather displaced, rotated, or have slightly differentpitch. This interference pattern manifests as wavy lines or as rippled effect.Current technical solution to mitigate these optical artefacts is typically dot decoating with dithering so that the opening’s diameter is randomized and regular patterns are avoided. However, this methodhas a major limitation on the processing speed. The laser beam must be stationary at one locationuntil the coating is fully removed before moving to the next location. In most cases, a single laser pulseis not enough to achieve full coating removal. This process is time consuming and requires that thelaser pulses must be perfectly irradiated at the same surface location and so, the need of highly precisepositioning of the laser beam.Therefore, there is still a need in the art to provide an efficient and cost-effective solution to providecoated glass articles with a laser decoated zone of superior optical quality.Summary of the InventionThe present invention relates to a glass article comprising a glass sheet comprising a first surface and a second surface opposite to the first surface; and a coating disposed on at least a portion, preferablyon the entire area, of the second surface of the glass sheet. The coating has a perforated zonecomprising discrete openings having dimension equal to or lower than 200µm and being spaced fromeach other by a spacing distance equal to or lower than 200μm. The dimension is characterised by anaverage dimension and a standard deviation. The standard deviation is equal to or lower than 10% ofthe average dimension, preferably is equal to lower 5% of the average dimension, more preferably equal to lower 2% of the average dimension. And / or the spacing distance is characterised by anaverage spacing and a standard deviation and its standard deviation is equal to lower 10% of theaverage spacing, preferably equal to lower 5% of the average spacing, more preferably equal to lower2% of the average spacing. The first surface comprises at least one optical roughened zone positionedin a complementary fashion to the perforated zone. The glass sheet within the at least one optical roughened zone, provides a clarity equal to or lower than 80%, preferably equal to or lower than 50%, more preferably equal to or lower than 30%. In a preferred embodiment, the discrete openings are spaced from each other by a spacing distanceequal to or lower than 150μm (S ≤ 150µm), more preferably by a spacing distance equal to or lowerthan 100µm (S ≤ 150µm). In another preferred embodiment, the discrete openings are in the shapeof lines having a width of equal to or lower than 30 μm (W ≤ 30µm), preferably equal to or lower than 20 μm (W ≤ 20µm), more preferably less than 10µm (≤ 10µm).The at least one optical roughened zone has a roughened surface. The perforated zone has aperforated surface and perforated perimeter. In one embodiment, the surface of the at least onezone extends over the surface of the perforated zone according to the formula: ∆^= ;^ Δx is the extension distance expressed in mm,^ T thickness of the glass sheet expressed in mm,^ n is glass refractive index of the glass sheet,^ W is the average width of the discrete openings, expressed in mm, and^ D the average spacing distance of the discrete openings, expressed in mm.The coating is preferably an ink layer, preferably a based organic ink, more preferably an acrylic ink(acrylic network with colour imparting pigments) or epoxy ink. It is preferred that the ink layer exhibits a TLD4 light transmittance equal to or lower than 50% (TLD4 ≤ 50%), preferably equal to or lower than 30% (TLD4 ≤ 30%), preferably equal to or lower than 10% (TLD4 ≤ 10%), preferably equal to or lower than 5% (TLD4 ≤ 5%) and more preferably equal to or lower than 2% (TLD4 ≤ 2%) The coating has preferably a thickness equal to or greater than 1μm (≥ 1µm), preferably equal to or greater than 2μm (≥ 2µm), preferably equal to or greater than 3μm (≥ 3µm), more preferably equal to or greater than 5μm (≥ 5µm) and / or equal to or lower than 40µm (≤ 40µm), preferably equal to or lower than 30µm (≤ 30µm), preferably equal to or lower than 25µm (≤ 25µm), preferably equal to or lower than 20µm (≤ 20µm), preferably equal to or lower than 15µm (≤ 15µm), more preferably equal to or lower than 12µm (≤ 12µm). The coating has preferably a thickness variation equal to or lower than the lowest value of either (a) 3µm or (b) 20% of the average coating thickness. Preferably, the thickness of the glass sheet is equal to or lower than 2mm, preferably equal to or lower than 1.6mm, more preferably equal to or lower than 1.3mm. In a preferred embodiment, the glass sheet is a strengthened glass, preferably a chemicallystrengthened glass. In another preferred embodiment, the first surface of the glass sheet is coatedwith an anti-fingerprint coating.The present invention also relates to a dead front article that comprises the glass article of the presentinvention and at least a display device having at least a screen. The second surface of the glass sheetis facing the display device, and the screen is the positioned in a complementary fashion to theperforated zone. The present invention further relates to a method for producing the glass articles and the dead front articles of the present invention. The present invention also relates to the use of the glass article and of the dead front article for car interior application, home appliances and / or integrated interactive display. Other aspects and advantages of the embodiments will become apparent from the following detailed description taken in conjunction with the accompanying drawings which illustrate, by way of example, the principles of the described embodiments.Brief description of the drawingsFigure 1 (a) (b) shows cross-sectional views of two embodiments of a portion of a glass articleaccording to the present invention, comprising an optical roughened zone positioned in acomplementary fashion to the perforated zone of the coating. In figure 1(a), the roughening zone doesnot extend over the perforated zone. In figure 1(b), the roughening zone extends beyond the perforated zone.Figure 2 shows a cross-sectional view of a portion of a glass article according to one embodiment ofthe present invention comprising two discrete openings.Figure 3 shows a cross-sectional view a deadfront article according to one embodiment of theinvention with a perforated zone positioned in a complementary fashion to the screen of a display device.Figure 4 (a) and (b) shows two examples of decorative patterns to be used on the first surface of theglass sheet glass article of the present invention.Figure 5 (a) (b) (c) are photographic representations of dead front articles: one embodiment of thepresent invention and two embodiments of the prior art.Detailed description of the InventionOne objective of the present invention is to provide cost effective coated glass articles with a see-through zone of superior quality and rendering. By ‘cost effective’, it is herein understood as being manufactured by a fast, simple and efficient manufacturing process. By ‘superior quality and rendering’, it is herein understood as allowing light that is incident onto coating to pass through the coating and the glass sheet without any distortion. In particular, the objective is to obtain a superior optical quality and rendering of the image that is displayed when the glass article is used in combination with a display device.It has been surprisingly found that to achieve high processing speeds, regular decoating patterns arepreferred and line decoating patterns are even more preferred. It has been further found that toachieve superior quality and rendering, the glass sheet should be further treated to avoid the opticaldrawbacks caused by the regularity of decoating patterns.It has been surprisingly found that such optical artefacts can be mitigated by specific roughening ofthe glass sheet above the decoated zone. Therefore, the present invention achieves the combinedeffect of efficient and cost-effective processing while avoiding optical artefacts such as diffraction and / or the Moiré effect. The present invention relates to a glass article (A) comprising: a) a glass sheet (2) comprising a first surface (21) and a second surface (22) opposite to thefirst surface; and b) a coating (3) disposed on at least a portion, preferably on the entire area, of the secondsurface of the glass sheet, wherein the coating has a perforated zone (5) comprising discrete openings (4) having dimension (D) equal to or lower than 200µm (D ≤ 20µm) andbeing spaced from each other by a spacing distance (S) equal to or lower than 200μm (S ≤200µm).The glass article is configured to cover at least a display device having at least a screen, wherein thesecond surface of the glass sheet is facing the display device and wherein the screen is positioned ina complementary fashion to the perforated zone. When used in a car application, the first surfacebeing opposite to the second surface, will face the interior of the car and the second surface faces thecarrier.Regular pattern herein means regular spacing distance and / or regular dimension : Regular spacingdistance (S) is characterised by an average spacing and a standard deviation wherein its standarddeviation is equal to or lower than 10% of the average spacing, preferably equal to or lower than 5%of the average spacing, preferably equal to or lower than 2% of the average spacing. And / or regulardimension (D) is characterised by an average dimension and a standard deviation wherein its standarddeviation is equal to or lower than 10% of the average dimension, preferably equal to or lower than5% of the average dimension, preferably equal to or lower than 2% of the average dimension.The first surface comprises at least one optical roughened zone (1) positioned in a complementaryfashion to the perforated zone; and the glass sheet within the at least one optical roughened zone, provides a clarity equal to or lower than 80% (Clarity ≤ 80%), preferably equal to or lower than 50% (Clarity ≤ 50%), more preferably equal to or lower than 30% (Clarity ≤ 30%).Clarity is measured with the parameters and device (BYK Haze-gard i) required in ASTM standardD1003 with illuminant C. “Clarity” corresponds to the portion of light that is transmitted through the glass and scattered by the final glass surface away with a different angle than the direct transmissiondirection (similar or parallel to the incident light rays direction) within a solid angle of 2.5° away from the direct transmission direction.Hence, as illustrated in Figure 1 (a), the present invention relates to a glass article (A) comprising aglass sheet (2) comprising a first surface (21) and a second surface (22) opposite to the first surface.A coating (3) is disposed on at least a portion of the second surface of the glass sheet, wherein thecoating has a perforated zone (5) comprising discrete openings (4). The roughened zone is positionedin a complementary fashion to the perforated zone and does not extend over the perforated zone.The roughened zone is herein after referred to as ‘optical roughened zone’By “positioned in a complementary fashion", it is understood that the at least one optical roughenedzone has substantially the same overall shape, perimeter shape, design, and / or pattern, and occupyat substantially the same relative surface area than the perforated zone within the coating on theopposite surface of the glass sheet. This means that the optical roughened zone and the perforatedzone on the opposite surface are designed to match each other in terms of their geometrical features(same overall shape, perimeter shape, design, and / or pattern...) and the level of overlap. Therefore,any glass sheet exhibiting two zones with different roughness on a first surface and a coating on a second surface opposite to the first surface is not considered as positioned in a complementaryfashion, as the at least one optical roughened zone does not correspond to the perforated zone interms of shape, perimeter, design, pattern, or surface area.The at least one optical roughened zone has a roughened surface having a roughened perimeter. Theperforated zone has a perforated surface having perforated perimeter. The optical roughened zone ispositioned in a complementary fashion to the perforated zone such that that roughened surface has substantially the shape and area than the perforated surface and the roughened perimeter is substantially the same perimeter than the perforated perimeter.In a preferred embodiment to further improve the optical surface of the perforated zone, theperimeter of the optical roughened zone can extend over the perimeter perforated zone. It can extendby an extension distance, Δx, on a section of the perforated zone perimeter or along the entire perimeter of the perforated zone. The extension distance, Δx, is preferably calculated by the following formula: ∆^ = 2.1∗T / ^ ∗ (^−^) wherein- Δx is the extension distance expressed in mm from the perforated zone perimeter,- T is the thickness of the glass sheet expressed in mm,- n is glass refractive index of the glass sheet (no unit),- W is the average width of the discrete opening expressed in mm, and- D is the average spacing distance expressed in mm.Figure 1 (b) shows a schematic cross-sectional view of a glass article (A) comprising a glass sheet (2)with a roughening zone (1) on the first surface (21) of the glass sheet and a coating (3) on the second surface (22). The coating comprises a perforated zone (5) comprising discrete openings (4). Theroughening zone perimeter extends over the perforated zone perimeter by an extension distance Δx.By “regular array” is herein understood a regular spacing distance (S) and / or a regular dimension (D). The spacing distance is the distance between the center of two adjacent discrete openings. For discrete openings in the form of ovals or lines, the spacing distance in measured center to center inthe direction normal to the length of the line. The spacing distance is characterised by an averagespacing and a standard deviation. Dimension is the diameter in case of circular shape, longest axis incase of elliptical shape or width in case of lines, and is characterised by an average dimension and astandard deviation.‘Regular spacing distance’ means that the standard deviation of the spacing distance is equal to orlower than 10%, preferably equal to or lower than 5%, more preferably equal to or lower than 2% ofthe average spacing. ‘Regular dimension’ means that the standard deviation of the dimension is equalto or lower than 10%, preferably equal to or lower than 5%, more preferably equal to or lower than2% of the average dimension.The spacing between the individual discrete openings is equal to or lower than 200μm (≤ 200µm),preferably equal to or lower than 150μm (≤ 150µm), more preferably equal to or lower than 100μm(≤ 100µm), typically equal to or greater than 7µm (≥7µm), preferably equal to or greater than 10µm(≥10µm), more preferably equal to or greater than 15µm (≥15µm).The spacing between the discrete openings is measured by a conventional 3D optical confocal microscope. The microscope will map the topography of an area 100µm x 100µm. From this topographic view, the spacing of two adjacent discrete openings, corresponding to the distance between the center of these 2 adjacent discrete openings is measured 5 times, and the average is calculated to provide a single spacing value. This measurement is repeated 10 times with a distance of 0.5 cm between each measurement.The discrete openings have a dimension (diameter, longest axis or width) equal to or lower than200µm, preferably equal to or lower than 100μm, preferably equal to or lower than 85μm, preferablyequal to or lower than 60μm, preferably equal to or lower than 30 μm, preferably equal to or lower than 20 μm, more preferably equal to or lower than 10 μm. Typically, the dimension of the discrete opening is equal to or greater than 1µm, preferably greater than 3µm more preferably greater than 5µm. The dimension of the discrete opening is measured by a conventional 3D optical confocal microscope. The microscope will map the topography of an area 100µm x 100µm. From this topographic view, the dimension of 5 individual openings is measured, and the average is calculated to provide a singledimension value. This measurement is repeated 10 times with a distance of 0.5 cm between eachmeasurement. COATING A coating (3) is disposed on at least a portion, preferably on the entire area, of the second surface ofthe glass (22) of the glass sheet (2) – Figure 1. By ‘entire area’, it is intended to mean that the majorityof the surface is coated. The term ‘majority’ is intended to mean almost the entire surface area, preferably the entire surface area. However, it cannot be excluded that some insignificant part(s) of the surface are not covered. The term ‘insignificant’ would mean having no substantial impact on the dedicated performance.The coating can be deposited on either the air side or the tin side of the glass sheet manufactured bya float process. The deposition of the coating on the second surface can be achieved before or afterthe creation of the optical roughened zone (1) on the first surface (21), preferably after the creationof the optical roughened zone (1) on the first surface (21).Within the scope of the invention, coating can refer to a single coating layer of a single material aswell as several coating layers of the same or different material(s). Suitable for use in the presentinvention are the following coatings that can deposited by any conventional deposition process. Suitable coating may be a solar control coating, a low emissivity coating, an insulating coating, a conductive coating, an antireflective coating, an anti-fog coating, and the like. The single layers of the coating, may typically comprise one or more metals, non-metals, semi-metals, semiconductors, oralloys, compounds, composites, combinations and blends thereof. A single layer may have a physicalthickness of from 0.5 nm to 500 nm, while a multilayer coating may have a total physical thickness of from 5 nm to 1000 nm. The thickness of a layer may be measured using a profiling measurement of the stack, using for example X-ray photoelectron spectroscopy (XPS). In some instances, it may becombined with X-ray fluorescence (XRF). Examples of coatings may include dielectric coatings comprising multiple layers of dielectric materials. Dielectric materials may include metal oxides, nitrides, carbides, oxynitrides, oxycarbides, oxycarbonitrides, or the like. In some instances, at least one functional layer such as an infrared reflective layer can be deposited between two antireflection layers each possibly comprising several layers which are each made of dielectric materials based on metal nitrides or metal oxides. The dielectric layers can comprise oxides, nitrides, oxynitrides or oxycarbides of Zn, Sn, Ti, Zr, Si, In, Al, Bi, Ta, Hf, Mg, Nb, Y, Ga, Sb, Mg, Cu, Ni, Cr, Fe, V, B, or mixtures thereof. In certain embodiments of the present invention, the dielectric layers may comprise oxides, nitrides, oxynitrides or oxycarbides of Zn, Sn, Ti, Zr, Si, In, Al, Nb, Sb, Ni, Cr, V, Mb, Mg, or mixtures thereof. Alternatively, the dielectric layers may comprise oxides, nitrides, oxynitrides of Zn, Sn, Ti, Zr, Si, In, Al, Nb, Sb, Ni, Cr, or mixtures thereof. These materials may optionally be doped, wherein examples of dopants include aluminum, zirconium, or mixtures thereof. The dopant or mixture of dopants may be present in an amount up to 15 wt%. Examples of dielectric materials may include, but are not limited to, silicon based oxides, silicon based nitrides, zinc oxides, aluminum doped zinc oxides, zinc-based oxides, tin oxides, mixed zinc-tin oxides, silicon nitrides, silicon oxynitrides, titanium oxides, aluminum oxides, zirconium oxides, niobium oxides, aluminum nitrides, bismuth oxides, mixed silicon-zirconium nitrides, and mixtures of at least two thereof, such as titanium-zirconium oxides, titanium-niobium oxides, zinc-titanium oxides, zinc- gallium oxides, zinc-indium-gallium oxides (IGZO), zinc-titanium-aluminum oxides (ZTAO), zinc-tin- titanium oxides, zinc-aluminum-vanadium oxides, zinc-aluminum-molybdenum oxides, zinc- aluminum-magnesium oxides, zinc-aluminum-chromium oxides, zinc-aluminum-copper oxides, zinc- titanium-zirconium oxides. The dielectric layer may consist of a plurality of individual layers comprising or essentially consisting of the above materials. The dielectric layers may each have a thickness ranging from 0.1 to 200 nm, preferably from 0.1 to 150 nm, more preferably from 1 to 120 nm, most preferably from 1 to 80 nm. Different dielectric layers may have different thicknesses. That is, the first dielectric layer may have a thickness that is the same or different, greater or smaller, compared to the thickness of the second or third or any other dielectric layer.Dielectric coatings may include those coatings comprising multiple layers of dielectric materials having alternating refractive indices, that is, coatings comprising at least one layer of high refractive index material, and at least one layer of low refractive index material. Such coatings can be represented with a coating comprising a first layer of material having a low or high refractive index, a second layer of material having a high or low refractive index, a third layer of material having a low or high refractive index, a fourth layer of material having a high or low refractive index, and optional protective layer. High refractive index layers may include a mixed titanium zirconium oxide, a mixed titanium silicon oxide, a mixed niobium zirconium oxide, a mixed silicon zirconium nitride, aluminium doped silicon nitride, zirconium oxide, mixed indium tin oxide, mixed zinc aluminium mixed oxide, mixed antimony tin oxide, mixed titanium zinc oxide, mixed zinc tin oxide. A low refractive index can be a refractive index < 1.8, or preferably < 1.7, while a high refractive index can be a refractive index > 1.8, or preferably ≥ 1.9, or more preferably ≥ 2.0. Some layers may have intermediate refractive indices comprised of from 1.7 to < 1.9. Low refractive index materials may include silicon oxide, silicon oxynitride, silicon oxycarbide, optionally doped, for example with aluminium, or mixtures, such as mixed oxide of silicon and aluminium, mixed oxide of silicon and zirconium. Refractive indices can be considered at a wavelength of 550 nm. Such coatings may be designed for antireflection purposes or for reflection purposes, especially based on the use of the Fresnel reflections put in place, as dielectric highly reflective coatings reflect light based on constructive interference to maximize Fresnel reflections, while the antireflective coatings will utilize destructive interference to minimize Fresnel reflections. In instances where at least one functional layer is present in a multilayer coating, said functional layer may be an infrared reflective layer such as a transparent conductive oxide layer, especially of the type ITO (mixed oxide of indium and tin) or SnO2:F (fluorine doped tin oxide) or a metallic functional layer, in particular a silver, gold or copper based layer, or combinations or alloys thereof. Such a multilayer coating comprising a metallic functional layer generally comprises an alternating sequence of n metallic functional layers and n+1 dielectric or antireflective coatings.Such a metallic functional layer may be provided in a multilayer coating with further barrier layers, preventing oxidation, as is known in the art, located over and / or under the metallic reflective layer. Preferred coatings for use in the present invention, are ink layers. The ink layer is a layer having a lower transmittance of visible light than the glass sheet, in the visible spectral range from 380 nm to 780 nm. It preferably exhibits typically a TLD4 light transmittance equal to or lower than 50% (TLD4 ≤ 50%), preferably equal to or lower than 30% (LTD4 ≤ 30%), preferably equal to or lower than 10% (LTD4 ≤ 10%), preferably equal to or lower than 5% (LTD4 ≤ 5%) and morepreferably equal to or lower than 2% (LTD4 ≤ 2%) to provide opacity.The light transmission TLD4 is determined according to the ISO9050 standard for a thickness of 4 mm at a solid observation angle of 2° (with illuminant D65) and for a wavelength range between 380 and 780 nm.The ink is not particularly limited. Suitable inks are inorganic type inks containing a ceramic fired bodyor the like, organic type inks containing a dye or a pigment and / or an organic resin. Preferred aresolvent based organic inks and more preferred are acrylic inks or epoxy inks. Preferably, the ink layeris a single layer for ease of production and / or ease of laser decoating technique. However, it can also comprises different sublayers.The ink layer can be semitransparent layers, contrast layers and / or color layers. Semi-transparentlayers may include a region of solid colour or a design of two or more colours, that can potentiallyprovide a decorative pattern. Contrast layer can be used to enhance the visibility or contrast betweenthe colours of the semi-transparent layers. Color layer can include multiple colors across the layerand / or specific colors in specific regions. It can be a continuous layer or discontinuous, i.e., color isonly provided in certain locations.The ink layer can be printed onto the substrate using a CMYK color model or other color models thatincorporate white ink. The ink can be thermal or UV cured ink. In particular, the ink is composed of at least one or morecolorants and a carrier. The colorants can be soluble or insoluble in the carrier. The colorants can drycolorants in the form of a fine powder. Such fine powders have particles that are typically from 10nmto 500nm in size. Using the CMYK color model, the colorant provides cyan, magenta, yellow, and / or key (black) colors. For white inks, the colorant can be any of a variety of suitable pigments, such asTi02, Sb203, BaSC, BaS04:ZnS, ZnO, and (PbC03)2:Pb(OH)2. The colorants are dissolved or suspended in the carrier.The carrier can serve as a binder to create adhesion to the surface upon which the ink is applied.Further, in some embodiments, additives can be included in the carrier to improve adhesion to glasssurfaces. Non-limiting examples of carriers for the colorant include propylene glycol monomethylether, diethylene glycol diethyl ether, dimethylacetamide, and toluene. Generally, such carrierssolidify at temperatures from 80°C to 200°C. In general, the ink includes from 0.5% - 6% by volume ofthe colorant and 94% - 99.5% by volume of the carrier.Printing methods include, but are not limited to, ink jet printing, screen printing, and transferdecoration over the second face of the glass sheet.The thickness of the ink layer is typically comprised between 1μm and 50μm (1µm ≤ thickness ≤ 50µm).Preferably to provide minimal light blocking, the ink layer thicknesses is equal to or greater than 2μm (≥ 2µm), preferably equal to or greater than 3μm (≥ 3µm), more preferably equal to or greater than5μm (≥ 5µm). Preferably for ease of decoating and cost effectiveness, the ink layer’s thickness is equalto or lower than 40µm (≤ 40µm), preferably equal to or lower than 30µm (≤ 30µm), preferably equalto or lower than 25µm (≤ 25µm), preferably equal to or lower than 20µm (≤ 20µm), preferably equal to or lower than 15µm (≤ 15µm), more preferably equal to or lower than 12µm (≤ 12µm). The minimum and maximum thicknesses are mean values of layer thickness. Thickness is measured in the direction perpendicular to the glass sheet face.Furthermore, it is generally advantageous if the layer thickness of the ink layer is not too large. Thisfacilitates the removal by laser ablation. This is also advantageous for light transmission through theopenings in the area of the ink layer. If the ink layer is too thick, the walls of the openings will have acorresponding length and will absorb an unnecessary amount of light. On the other hand, ink layersthat are too thin are also unfavorable, in particular in view of ensuring a sufficient degree of light blocking. Preference is given to layer thicknesses of equal to or greater than more than 1 μm (≥ 1µm), equal to or greater than more than 2 μm (≥ 2µm) equal to or greater than more than 3 μm (≥ 3µm)and equal to or greater than more than 5 μm (≥ 5µm) that are generally necessary to suppress thetransmission of the light from the display panel. A thickness of the ink layer of 25μm or less, it ispossible to suppress the narrowing of the viewing angle. The minimum and maximum thicknesses given above are mean values of layer thickness.The thickness of the ink layer can be measured by any conventional method known by person skilledin that art such conventional optical microscope or profiling tools such as confocal microscope, white light interferometer or stylus profiler. To facilitate further the removal by laser ablation, it is recommended that the thickness of the coating (single layer or multiple layers) is uniform. By ’uniform’, it is meant that the coating has a thickness standard deviation equal to or lower than the lowest of either (a) 3µm or (b) 20% of the average thickness. Preferably, the coating has a thickness such that it has a standard deviation equal to or lower than the lowest value of either (a) 2µm or (b) 10% , preferably 5%, more preferably 2% of the average thickness. The thickness of the coating is measured by a conventional a 3D optical confocal microscope. Within the coating, a line of 35µm width is laser decoated across the length of the glasssheet to expose the glass surface (decoated area) and provide the zero height reference. The laserdecoating process is done with a laser source with pulse duration of 10 ps and wavelength of 1064nm. The laser beam has Gaussian profile. The laser beam is coupled to a galvo scanner equipped with an f-theta lens, which has a focal length of 100 mm. The laser beam diameter at the focus of the lens is approximately 20 um. The other laser parameters are as follows: pulse repetition rate 1 MHz, average power 16 W, scanning velocity 2750 mm / s. Attention should be paid not to damage the surface of the glass sheet. The microscope will map the height of an area 100 um x 100 um. This 100 µm x 100 µm area should include at least part of the decoated area to provide the height reference point. Thethickness of the coating within the scanned area is estimated by the software integrated in themicroscope and provides a single thickness value. This measurement is repeated 10 times with a distance of 0.5 cm between each measurement. LASER DECOATING The glass article of the present invention can have one more perforated zone(s). Perforated zone(s) can be used to create decorative patterns that are visible with incident light source and / or to provide visual access to the screen of display. Any light source can be suitable in the form of display module as well as any light sources for producing graphics, icons, images, displays, etc. Exemplary displays include LED (light emitting diode) displays, a DLP (digital micromirror device) MEMS chip, LCDs (liquid crystal displays), OLED (organic light emitting diode) displays, transmissive displays and the like. Combinations of different perforated zones of different functions can be used to create appealing designs. Laser ablation is preferably used to produce such see-through effect. An apparatus for laser ablation is used to create a multitude of discrete openings or holes (4) within the coating (3), which togetherdefine a perforated zone (5) as shown in Figure 1 (a). The pattern of openings defines a perforateddisplay zone, by allowing light that is incident onto the coating to pass through the coating and the glass sheet so that the perforated zone demonstrate a light transmission (LTD4) typically comprised between 5% and 70% depending on the application. Preferably, the perforated zone has a light transmission LTD4 equal to or greater than 10% (LTD4 ≥ 10%), more preferably a LTD4 equal to or greater than 15% (LTD4 ≥ 15%), LTD4 equal to or greater than 30% (LTD4 ≥ 30%). Preferably, the perforated zone has a light transmission LTD4 equal to or lower than 50% (LTD4 ≤ 50%). Typically, the apparatus for laser ablation comprises a laser and a device for guiding the laser beam emitted by the source over the coated surface of the glass substrate. For example a galvanometer scanner can be employed as the device for guiding the laser beam over the surface. Means for displacing the glass sheet may be provided alternatively or in addition to a galvanometer scanner. As known by those skilled in the art that, decoating can be done with one or multiple laser beams simultaneously to increase the processing speed. It can be achieved either by splitting one laser beamor using multiple laser sources and multiple scanners. The splitting of the laser beam can happenbefore or inside the scanner head. Particularly suitable for this purpose is an X-Y table, also referred to as a cross table. In such an embodiment, the laser beam can be hold stationary and the openings with the desired shape can be introduced into the decorative layer by moving the X-Y table with the glass sheet substrate placed thereon. In order to ensure consistent high accuracies, it is also possible to use a synchronized scanning and displacing apparatus. In this case, the movement of table or another means for displacing the glass sheet is synchronized with the deflection of the scanner, e.g. galvanometer scanner. For focusing the laser beam on the surface in order to achieve the highest possible intensity, appropriate focusing optics may be provided. Focusing optics can be arranged downstream ofgalvanometer scanner. However, it will be apparent to those skilled in the art that other configurationssuitable to focus the laser beam onto the glass sheet are likewise possible. In order to achieve short focal lengths it is favorable to arrange the focusing optics behind the galvanometer scanner as seen in the beam direction. A focusing optical system, in particular a lens or group of lenses or a focusing mirror with a focal length of less than 300 mm, is preferred.For locally removing the coating to create discrete openings which extends through the coating, thedevice for guiding the laser beam moves the laser beam over the surface, and the laser is adjusted sothat the ablation threshold of the material of the coating is exceeded and thus the coating is removedat the point of impingement. However, the output power of the laser is adjusted so that the ablationthreshold of the glass sheet, is not reached so that only the coating is removed. For glass the ablationthreshold for a laser wavelength of 1064 nm is approximately 5.2*1017 W / m2.It is therefore advantageous if the materials of the glass substrate and of the coating are selected sothat the ablation threshold of the material of the glass substrate is higher than the ablation threshold of the coating, in particular in the infrared spectral range, more particularly at a wavelength of 1064 nm. The laser beam guiding device is controlled by a control device which may for instance execute a program that translates the shape and location of the pattern feature into control signals by means of which the laser beam is moved over the surface by the laser beam guiding device. Preferably, the control device also controls the laser, in particular with regard to switching on and off and laser emmision. According to one exemplary embodiment, a pulsed laser was selected which can be sufficiently well focused to ablate dots. This can be achieved with a neodymium-YAG laser with a wavelength of 1064 nm and a pulse length of 10 ps. A scanner with optics having a focal length of 255 mm can be employed. The M2 factor is less than 1.4, preferably less than 1.2. The tubular beam has a diameter of 12 mm. Average output power 50W at 200 kHz is typically reduced to about 4 W. Other lasers may also beused. In particular a laser with a wavelength of 532 nm and a pulse length in the range 1 – 50 ns isadvantageous: the smaller wavelength allows for better focusing and the longer pulse length will prevent the material to become stained which is disadvantageous in case of light colored layer. Furthermore, lasers in the ns range have a distinct cost advantage over lasers in the any case it is advantageous for the ablated features to have a width of less than 0.02 mm. Figure 2 is a schematic cross-sectional view of a glass article (A) comprising a glass sheet (2) with acoating (3) on its second surface (22). Discrete openings (4, 4b) have been introduced into the coating(3).In the example shown on the right of Figure 2 the wall of the discrete opening (4) is substantiallyperpendicular to the glass sheet (2). According to another embodiment illustrated on the left, thediscrete opening (4b) may taper from the outer surface of the coating (3) toward the second surface(22) of the glass sheet (2), i.e. being wide at one end and narrowing down at the other end. Such tapered discrete opening may be advantageous for introducing an opening even into rather thickcoating by repeated or stepwise ablation. Preferably, however, the angle α between the wall ofdiscrete opening and the surface normal of the glass sheet is smaller than 20°, preferably smaller than 15°. This angle is the mean angle of the wall which can be easily determined trigonometrically fromthe ratio of the width of the opening at the substrate to the width at the surface of coating and thethickness of coating. It is recognized in the art that laser ablation may cause a dark discoloration of the coating. If thecoating itself is dark, such discoloration and hence the openings will remain invisible. However, this isdifferent for coatings having a light color hue. In this case, the dark discoloration may be visible at theedges of the opening. This can be counteracted by adjusting the pulse frequency of the laser and therate at which the laser beam is directed over the coating such that the points of incidence of the laserpulses do not excessively overlap each other, which results in the desired dot pattern. According to a preferred embodiment, a top-hat profile of the laser beam is used in order to minimize the thermal impact in the peripheral area of the opening to be produced so as to avoid the staining effect. In this case, the edge regions of the initially Gaussian beam which have not enough energy forablating the ink but yet have enough energy to heat the coating to an extent to cause discolorationthereof, are eliminated. Another advantage of a top-hat profile is better contour definition, since a Gaussian profile does not permit to remove multi-layered systems with sharp contours, although this effect might cause an additional blurring on a micrometer scale that is hardly visible or not visible at all to the eye. Laser decoating is typically achieved on the second surface of the glass sheet, i.e. directly on thecoating. However, it has been surprisingly found that laser decoating from the opposite side i.e. thefirst surface (21) of the glass sheet, is more effective. The discrete openings (4, 4b) have a tubularshape across the decorative layer (3) as illustrated in Figure 2. To create the discrete opening (4, 4b), the laser beam will vaporize a very small region close (4i, 4bi) to the second glass surface (22) that will push away the remaining material. Laser decoating from the first surface of the glass sheet is therefore faster and more efficient. 1. Discrete openingsThe coating disposed on the second surface of the glass sheet has a perforated zone. Preferably, thecoating covers the entire surface of the second surface of the glass sheet. The perforated zonecomprises discrete openings. By ‘discrete opening’, it is understood that, each discrete opening has one of the dimension (diameter, longest axis or width) in the micrometer scale, typically lower than 200µm. Dimension is commonly understood as the diameter in case of circular shape, longest axis in case of elliptical shape or width in case of lines. The discrete openings are distinct from one another in the perforated display area.Discrete openings are commonly understood as discrete openings through the entire thickness of the opaque layer.The discrete openings can be created via a single or multiple laser pulses. The discrete openings havea dimension equal to or lower than 200µm, preferably equal to or lower than 100μm, preferably equalto or lower than 85μm, preferably equal to or lower than 60μm, preferably equal to or lower than 30 μm, preferably equal to or lower than 20 μm, more preferably equal to or lower than 10 μm. When the glass article of the present invention is used as a dead front article, is it further preferred thatdiscrete openings have a dimension equal to or lower than 60µm, preferably equal to or lower than30µm, preferably equal to or lower than 20µm, more preferably equal to or lower than 10µm.Typically, the dimension of the discrete opening is equal to or greater than 1µm, preferably greaterthan 3µm more preferably greater than 5µm. Indeed, it has been found that too small discreteopenings can interact with the light (from the screen) and create artefacts as well as extending thetime of the laser decoating step. The width of the discrete opening is measured at the bottom of the coating or at the glass sheet surface exposed in the opening. The discrete openings or holes generally have the shape of circular dots. However, the discrete opening may as well have the shape of elongated ovals or other geometries. Preferably, the holes have the shape of lines. Indeed, it is preferred to produce openings having the shape of long straight lines, positioned parallel to one other. Discrete openings in the shape of lines are preferred because of their faster processing speed. Preferably, the discrete openings in the shape of lines have a width of less than 30μm, preferably of less than 20µm, more preferably of less than 10µm. For long straight lines, it is advantageous to use a polygon scanner, because when stitching long lines a small offset might quickly be produced. Due to the offset, the line would become wider at the crossing point andtherefore would appear much brighter at this point when backlit.A further process parameter is the percentage of the ablated surface area in relation to the totalsurface area within the perforated zone. This percentage is described by a ratio of ablated surfacearea to non-processed surface area within the perforated zone, i.e. the core area. In the case of dot-shaped discrete openings, the ratio of ablated surface area to non-processed surface area is determined according to the formula : R2* 100% / a2; wherein r is the radius of a dot and a is the spacing between two dots. In the case of discrete openings having a different shape, the percentage of the ablated surface area in relation to the total surface area is determined by the ratio of the summed surface areas of the discrete openings to the surface area of the non-processed surface within the perforated zone. Such areas will appear lighter or darker to the viewer, depending on theunderlying layer. However, areas with an ablated percentage surface area of less than 1%, in particular less than 0.5% of the total surface area are rather uninteresting, since light applications will appear slightly pixelated. Therefore, in order to obtain an area with the highest possible resolution, surface with an ablated percentage surface area of more than 0.8%, preferably more than 1%, most preferably more than 1.5% have to be selected. It has been found that in some applications, areas with an ablated percentage surface area of more than 0.5% of the total surface area can create a different color appearance. In order to mitigate or eliminate the different color appearance, a transition area can be created in which the ablated percentage surface area is reduced versus the core area by less than 2% per mm, preferably less than 1% per mm, more preferably less than 0.5% per mm. In this case, the reduction may be accomplished so that the ablated percentage surface area is preferably reduced to less than 0.5% of the total surface area at the side of the transition region adjoining the non-ablated area. The value of the gradient of the percentage surface area in the transition area may either be constant in the entire transition area or may vary. In case of a varying gradient, the aforementioned limit values refer to a mean valueaveraged along the gradient over the entire width of the transition area. Hence, in such embodiment,the perforated zone comprises a core area and a transition area. Therefore, in a preferred embodiment, a transition area is created within the perforated zone along the periphery of the core area, in which further dots are ablated so that the percentage surface area, determined by the ratio of ablated surface area to non-processed surface area is lower on average within the transition area than within the core area. The percentage of the total ablated surface areacomprising the core area and the transition area, can be from 10% up to 70% of the total surface areaof the perforated zone. Such percentage surface areas can be achieved with smaller discrete openings or with larger spacings of the discrete openings. 2. Cleaning stepRegardless of the layer thickness, the material removed by the laser might fall back on the surface in the form of dust. This dust can affect the ongoing decoating process. Furthermore, if the glass article is intended to be bonded with a display device, such dust can be detrimental. Ideally, the laser decoating device should be coupled with an exhaust pipe, which extracts the dust while they are in the air. Ideally, the glass article is washed after decoating to completely remove the contamination. The washing can consist of multiple steps using water and detergent. An additional ultrasonic washing step can be included to improve the cleaning efficiency. The final step is to rinsed the glass with pure or di-ionized water.OPTICAL ROUGHENED ZONESurface roughness, often referred to as surface texture, is the very well-known measure of the fine-scale irregularities or variations on the surface of a material. It consists of microscopic peaks and valleys that are typically the result of the manufacturing process used to create the surface. This characteristic is distinct from larger-scale variations like waviness or form errors. The glass article of the present invention comprises a glass sheet wherein the first surface comprisesat least one optical roughened zone positioned in a complementary fashion to the perforated zone.The glass article within the at least one optical roughened zone provides a clarity equal to or lowerthan 80%, preferably equal to or lower than 50%, more preferably equal to or lower than 30%.It has been surprisingly found that roughening on the first surface, a zone positioned in acomplementary fashion to the perforated zone, expands even further the light scattered through theperforated zone of the glass article. Indeed, it has been surprisingly found that the specific rougheningof the zone providing a clarity of at most 80%, allows to scatter each individual light beam in manydirections, resulting in the mitigation or even suppression of the inferential pattern for all viewing angles.Roughened ProcessThe specific roughening of the zone to provide a clarity of at most 80%, can be achieved by etching (acid, alkaline, liquid or vapor), laser texturing, sand blasting, embossing, rolling, mechanical polishing, engraving, and / or vapor deposition (e.g., chemical or physical vapor deposition), preferably byetching. Acid etching is preferred since it provides process control, short process time and flexibility.Many techniques can be used to obtain the at least one optical roughened zone on the glass sheetsubstrate. Those techniques can be directly selective by only treating the zone(s) that need to be treated or can be indirectly selective by using a temporary and protective mask to protect the areasthat do not need to be roughened.Examples of directly selective texturing are sandblasting, chemical etching (“brushing technique” with eg. HF-based paste), laser texturing, etc. Indirect selective texturing techniques can be sandblasting, wet and dry chemical acid-etching or alkaline etching, mechanical polishing, etc. involving the usage of a protective and temporary layer that can be applied by any known techniques such as inkjet printing, wax deposition, screen-printing application of a IR / UV-curable ink, transfer technique, spray application, etc.The roughening of the first surface of the glass sheet is preferably achieved via wet etching. Such wet etching can be a vertical etching process whereby the glass sheet is dipped into an etching bath. In such etching process, the second face of the glass sheet needs to be protected during the etching stepby an etch resistant mask or any other means. In a another embodiment, wet etching is an horizontaletching process whereby only the first surface of the glass sheet is etched by the etching solution.Partial roughening phase can be used to create the at least one optical roughened zone: A portion ofthe first surface is masked with an etch resistant material and exposed to an etching solution togenerate a certain level of surface roughness characterized by specific Ra and Rsm features and togenerate the at least one optical roughened zone. The mask is then removed.The coating can disposed on the second surface of the glass sheet, before or after roughnening.Decorative roughness zonesIn addition to the at least one optical roughened zone positioned in a complementary fashion to theperforated zone to mitigate the optical artefacts created by laser decoating, the first surface of theglass sheet car further comprise decorative optical roughened zone(s) (1b) that preferably creates adecorative pattern. Such decorative zone(s) can be created in the same manner than the at least one optical roughened zone. Preferably, the glass article of the present invention comprises twodecorative optical roughened zones or even multiple decorative optical roughened zones to createsophisticated decorative designs such as a leather grain pattern, a wood grain pattern, a fabric pattern, a stone pattern, a brushed metal finish pattern, carbon fiber pattern and / or a geometrical pattern oreven logos. A wood decorative pattern created by one decorative optical roughened zone and ageometrical pattern created by two decorative optical roughened zones are illustrated in Figure 4 (a) and (b).The decorative optical roughened zone is a zone imparting a decorative design to the glass article ofthe present invention to enhance the aesthetic appearance by including patterns and / or colors tocreate a visually appealing design.The decorative optical roughened zone can be created on the first surface of the glass sheet in distinctarea(s) than the at least one optical roughened zone required the present invention. In anotherembodiment, the decorative optical roughened zone(s) can overlap with the at least one opticalroughened zone as long as the optical property of clarity equal to or lower than 80% is maintainedwithin the at least one optical roughened zone. It can be also contemplated that the at least one opticalroughened zone is created after the decorative optical roughened zone(s).The decorative optical roughened zone is typically defined by (i) an area of relatively higher surfaceroughness bordered by at least one border area of relatively lower surface roughness or (ii) an area of relatively lower surface roughness bordered by at least one area of relatively higher surfaceroughness. Also contemplated in the present invention : the decorative optical roughened zone isdefined by (i) an area of relatively higher surface roughness bordered by at least one border area of even higher surface roughness or (ii) an area of relatively lower surface roughness bordered by at least one area of even lower surface roughness.By “roughened”, it is typically understood that the decorative optical roughened zone is characterizedby the roughness features of arithmetic amplitude value Ra (nm) and spacing value Rsm (µm)roughness values defined in the standard ISO 4287-1997. Alternatively, one can use the technique of 3D profilometry (according to ISO 25178 standard) but isolating a 2D profile which then gives access to the parameters defined in the ISO4287 standard. According to the invention, the roughness values are measured with a Gaussian filter, which is a filter of long wavelengths, also called profile filter ^c. It is used for separating the components of roughness / texture from components of undulation of the profile. The evaluation length, L, according to the invention is the length of the profile used to evaluate the roughness. Base length, l, is the part of the evaluation length used to identify irregularities characterizing the profile to assess. The evaluation length, L, is divided / cut into n base lengths, l, which depend on the profile irregularities. The base length, l, corresponds to the “cut-off” wavelength (or limit wavelength) of the Gaussian filter (l = ^c). Typically, the evaluation length is of at least five times the base length. In roughness measurements, a short wavelength filter (profile filter ^s) is also commonly used to eliminate the effects of very short wavelengths which are background noise.The decorative optical roughened zone has Ra value, Ra(zone). The border area has Ra value, Ra(border).In order to create a significant difference of visual and tactile rendering; there is preferably an absolutedifference between Ra(zone) and Ra(border) of at least 25 nm (│Ra(zone) - Ra(border)│ ≥ 25 nm); preferably atleast 50nm (│Ra(zone) – Ra(border)│ ≥ 50nm), more preferably at least 100nm (│Ra(zone) – Ra(border)│ ≥100nm), and even more preferably at least 200nm (│Ra(zone) – Ra(border)│ ≥ 200nm). Typically, theabsolute difference between Ra(zone) and Ra(border) is no more than 2 microns, preferably no more than 1 micron.The decorative optical roughened zone can also be characterised by the spacing value Rsm, Rsm(zone).The border area can also be characterised by the spacing value Rsm, Rsm(border). In order to create asignificant difference of visual and tactile rendering; there is preferably an absolute differencebetween Rsm (zone) and Rsm(border) is at least 2 µm (│Rsm(zone) – Rsm(border)│ ≥ 2 µm); preferably at least3µm (│Rsm(zone)-Rsm(border)│ ≥ 3µm), preferably at least 10µm (│Rsm(zone)-Rsm(border)│ ≥ 10µm), morepreferably at least 20µm (│Rsm(zone) - Rsm(border)│ ≥ 20µm), and even more preferably at least 30µm(│Rsm(zone) - Rsm(border)│ ≥ 30µm). Typically, the absolute difference between Rsm(zone) and Rsm(border) isno more than 150µm, preferably no more than 100µm. When multiple decorative optical roughened zones are created, there is preferably an absolutedifference between Ra1(zone) and Ra2(zone) of at least 25 nm (│Ra1(zone) – Ra2(zone)│ ≥ 25 nm) and there ispreferably an absolute difference between Rsm1 (zone) and Rsm2(zone) is at least 2 µm (│Rsm1(zone) –Rsm2(zone)│ ≥ 2 µm), to create a significant difference of visual and tactile rendering. In someembodiments, the decorative optical roughened zones can overlap as well. For superior tactile response of the consumer to the decorative design of the layer, one focuses on the absolute difference between Ra(zone) and Ra(border) that could preferably be comprised between, 50nm-500nm and on the absolute difference between Rsm(zone) and Rsm(border) that could preferably be comprised between 2µm-100µm. For some decorative design such as a silk pattern, a stone pattern, and / or a brushed metal finish pattern, the optical properties of gloss and diffusion properties can be of high interest. Preferably,gloss value is equal to or lower than 150 G.U. (gloss ≤ 150 G.U.), preferably equal to or lower than 120G.U. (gloss ≤ 120 G.U.), more preferably equal to or lower than 90 G.U. (gloss ≤ 90 G.U.). The gloss is measured in accordance with the ASTM standard D523-14 dated May 4, 2017, at the specific angle of 60°. DEADFRONT ARTICLE The glass article of the present invention can be used as car interior design elements, in particular for the car industry. The perforated zone(s) can be used to create decorative patterns that are visible with incident light source and / or to provide visual access to the screen of display device. Any light source can be suitable in the form of display module as well as any light sources for producing graphics, icons, images, displays, etc. Exemplary displays include LED (light emitting diode) displays, a DLP (digitalmicromirror device) MEMS chip, LCDs (liquid crystal displays), OLED (organic light emitting diode) displays, transmissive displays and the like. Combinations of different perforated zones of different functions can be used to create appealing designs.For interior design elements and / or displays for the car industry, it is common to use cover glass sheetsand even decorative cover glass sheet, that are specifically designed to fit a specific location in the carsuch as the dashboard, the central arm rest, the door arm rest,… The car industry is therefore stilllooking for high end quality cover glass to hide display devices. They are referred to as ‘dead frontarticle’ since when the display device is in the Off mode, it should be completely invisible to the car user whereas in the On mode, the display should be perfectly visible and provide the expected high resolution and optical properties.Therefore a further objective of the present invention is provide such high quality dead front article,that is easy and cheap to produce and that provides superior optical quality of the image.The present invention further relates to a dead front article that comprises the glass article of thepresent invention and at least a display device having at least a screen. The perforated zone ispositioned in a complementary fashion to the screen. By “positioned in a complementary fashion", it is understood that the perforated zone hassubstantially the same overall shape, perimeter shape, and / or design, and occupy substantially thesame relative surface area than the screen. By ‘substantially the same relative surface area’, it is hereinunderstood that that the perforated zone covers at minimum 75% of the screen, preferably 90% of the screen, preferably at minimum 100% of the screen. It can be contemplated that the surface of theperforated zone extends over the surface of the screen, in particular when the perforated zonecomprises a transition area.Figure 3 is a schematic view of one embodiment of the dead front article (B) of the present inventionthat comprises a glass sheet (2) and a screen (6) of a display device wherein discrete openings (4) have been created in the coating (3) to form the perforated zone (5). The roughening zone extends over the perforated zone by an extension distance Δx. The invention is implemented so that the glass article is positioned above the display device so that the first surface (21) of the glass sheet (2) faces the user and the second surface (22) of the glass sheet faces the display. Hence the coating (3) is deposited on the second surface (22) of the glass sheet (2) that faces away from the user. Accordingly, the light from a light source will therefore first passthrough the coating through openings, then through the glass substrate and will then exit from theopposite face (21). For use within a dead front article, the coating is preferably a ink layer and it thickness is preferably equal to or more than 3μm to suppress the transmission of the light from the display panel. A thickness of the colored layer of 25μm or less, it is possible to suppress the narrowing of the viewing angle. Thickness is measured in the direction perpendicular to the glass sheet faces. When the display is OFF, the discrete openings having such very limited size, allow the ink layer to perfectly hide the screen of the display device and the potential decorative optical roughened zone(s)provide(s) a very pleasant aesthetic experience to the user. In contrast, when the display is ON, theuser sees perfectly the image displayed on the screen via the perforated display zone. The size andposition of the discrete openings are selected so that in a backlit state the image displayed by the screen is perfectly visible, while a sufficient dead front effect is established in the off state. For the dead front article of the present invention, the discrete openings have preferably a size equal to or lower than 60μm, preferably equal to or lower than 30 μm, preferably equal to or lower than 20μm, more preferably equal to or lower than 10 μm. Preferably, the discrete openings in the shape oflines have a width of less than 30μm (≤ 30µm), preferably of less than 20µm (≤ 20µm), more preferably less than 10µm (≤ 10µm). Typically, the thickness of the glass sheet ranges from 0.5 to 25 mm. For the dead front article of the present invention, the glass sheet is preferably a thin glass to reduce the light optical path andtherefore the reduce light reflection and improve clarity on diffuse areas. In a preferred dead frontembodiment the thickness of the glass sheet is equal to or lower than 2mm, preferably equal to orlower than 1.6mm, more preferably equal to or lower than 1.3mm and even more preferably equal toor lower than 0.7mm. GENERAL The glass may be flat or totally or partially curved to correctly fit with the particular design of the vehicle or the potentially glass support, as the shape requires for the application.1. Glass sheet productionThe glass article of the present invention can be manufactured from a larger mother glass substrateby the following method described in WO2017 / 038853 filed by Asahi Glass Co LTD under applicationnumber WO2016JP75415 on 31 August 2016 incorporated herein by reference. This method comprises: (1) a step for preparing a glass material which has a first main surface and a second main surface, said main surfaces opposing each other; (2) a step for laser-irradiating the first main surface of the glass material so that an in-plane void area, wherein a plurality of voids are aligned, is formed in the first main surface and, at the same time, a plurality of inner void rows consisting of one or more aligned voids are formed from the in-plane void area toward the second main surface; and (3) a step for subjecting the glass material, in which the inner void rows are formed, to a chemical strengtheningtreatment. Please refer to the step of providing the glass material : Step 110 described in

[0034] to

[0041] , to the step of laser filamentation : Step 130 described in

[0042] to

[0078] , to the step of chemical strengthening : Step 120 described un

[0079] to

[0093] and to the separattion step : step 140 described in

[0094] to

[0133] from the corresponding EP publication EP3345877A, all incorporated herein by reference.The method may further comprise a step of cold bending after the step of separating. The cold bendingis particularly appreciated for bending glass articles for interior and exterior glazing part for automotive such as glass console, dashboard, trim element for door, pillars, windshields, sidewindows, back windows, sun roofs, separation walls,… Cold bending is any assembling operation inwhich an initially flat thin glass element is deformed into a final non-flat configuration in the assembly. The thin glass in the final assembly present a permanent unbalance of surface stresses between its two main surfaces. The assembling operation can be any kind of technology allowing to keep the thin glass in a non-flat configuration: gluing, laminating, mechanical retainers (screws, rivet, casing,…),...,applied either at punctual places or on the full surface. Preferably, for reasons of weight and to beable to cold bend easily the thickness of the glass article may be from 0.1 to 2.2 mm, 0.5 to 2.1 mm.When used within a deadfront article, the glass article typically covers display devices having a screendisplay diagonal of from 2.5cm to 25cm, preferably from 8cm to 40cm. Typically, the thickness of the glass sheet ranges from 0.5 to 25 mm. Preferably, the glass sheet has a sheet thickness of 2.0 mm or more, preferably of 3.0 mm or more, preferably of 3.5 mm or more, preferably of 4.5 mm or more; preferably of 5.5 mm or more, preferably of 7.5 mm or more, preferablyof 9.5 mm or more and more preferably of 11.5 mm or more. Typically, the sheet thickness is of 20mm or less, preferably 15 mm or less.2. Glass compositionThe composition of the glass is typically appropriate to be chemically tempered and for transportationapplications. The glass sheet may be a soda-lime-silicate glass, an alumino-silicate glass, an alkali-free glass, a boro-silicate glass, etc. Preferably, the glass sheet of the invention is made of a soda-lime glass or an alumino-silicate glass. The glass sheet according to the invention may be a glass sheet obtained by a floating process, a drawing process, a rolling process or any other process known to manufacture a glass sheet starting from a molten glass composition. The glass may be clear glass, extra-clear glassor colored glass, comprising one or more component (s) / colorant(s) in an appropriate amount as afunction of the effect desired. Colored glass include grey, green or blue float glass. In some circumstances, colored glass may be advantageous to provide for appropriate and desired color of the final glazing, within the limitations of applicable legislation. Soda-lime-silicate glass relates to any mineral glass which comprises the following components in weight percentage, expressed with respect to the total weight of glass (Comp. A). More preferably, the glass composition (Comp. B) is a soda-lime-silicate-type glass with a base glass matrix of the composition comprising the following components in weight percentage, expressed with respect to the total weight of glass. Comp. A Comp. BSiO2 40 - 78% 60 - 78 wt%Al2O3 0 - 18% 0 - 8 wt%, pref 0 - 6 wt%B2O3 0 - 18% 0 - 4 wt%, pref 0 - 1 wt%Na2O 0 - 20% 5 – 20 wt%, pref 10 - 20 wt%CaO 0 - 15% 0 - 15 wt%, pref 5 - 15 wt%MgO 0 – 15% 0 – 12 wt%, pref 0 - 8 wt%K2O 0 – 15% 0 – 12 wt%BaO 0 – 5% 0 – 5 wt%, pref 0 - 1 wt%.Other advantageous glass compositions for the mineral glass of the present invention, comprise the following components in weight percentage, expressed with respect to the total weight of glass: Comp. C Comp. D Comp. E65 ≤ C ≤ 78 wt% 60 ≤ SiO2 ≤ 78 % 65 ≤ SiO2 ≤ 78 wt%5 ≤ Na2O ≤ 20 wt% 5 ≤ Na2O ≤ 20 % 5 ≤ Na2O ≤ 20 wt%0 ≤ K2O < 5 wt% 0.9 < K2O ≤ 12 % 1 ≤ K2O < 8 wt%1 ≤ Al2O3 < 8 wt%, 4.9 ≤ Al2O3 ≤ 8 % 1 ≤ Al2O3 < 6 wt%pref 3 < Al2O3 ≤ 6 % 0≤ CaO < 4.5 wt% 0.4 < CaO < 2 % 2 ≤ CaO < 10 wt%4 ≤ MgO ≤ 12 wt% 4 < MgO ≤ 12 % 0 ≤ MgO ≤ 10 wt%(MgO / (MgO+CaO)) ≥ 0.5, pref K2O / (K2O+Na2O): 0.88 ≤ [MgO / (MgO+CaO)] < 1.0.05 - 0.7.According to certain embodiments of the invention, the glass may have a composition comprising a total iron (expressed in terms of Fe2O3) content ranging from 0.002 to 0.06 weight%. A total iron (expressed in the form of Fe2O3) content of less than or equal to 0.06 weight% makes it possible to obtain a mineral glass with almost no visible coloration. Preferably, the composition comprises a total iron (expressed in the form of Fe2O3) content ranging from 0.002 to 0.04 weight%. More preferably, the composition comprises a total iron (expressed in the form of Fe2O3) content ranging from 0.002 to 0.020 weight%. Advantageously, for extra-clear mineral glass, the composition comprises a total iron (expressed in the form of Fe2O3) content ranging from 0.002 to 0.015 weight% for the lowest visible light absorption. 3. Glass strengtheningThe glass sheet according to the invention can advantageously be strengthened : a heat strengthenedglass, a thermally toughened glass, or a chemically strengthened glass. Heat strengthened glass is heat treated using a method of controlled heating and cooling which placesthe glass surfaces under compression and the glass core under tension. This heat treatment methoddelivers a glass with a bending strength greater than annealed glass but less than thermally toughened safety glass. Thermally toughened safety glass is heat treated using a method of controlled heating and coolingwhich puts the glass surface under compression and the glass core under tension. Such stresses causethe glass, when impacted, to break into small granular particles instead of splintering into jagged shards. Chemical strengthening of a glass article is a heat induced ion-exchange, involving replacement of smaller alkali sodium ions in the surface layer of glass by larger ions, for example alkali potassium ions.Increased surface compression stress occurs in the glass as the larger ions “wedge” into the small sitesformerly occupied by the sodium ions. Such a chemical treatment is generally carried out by immerging the glass in an ion-exchange molten bath containing one or more molten salt(s) of the larger ions, with a precise control of temperature and time. 4. Additional layersAccording to the application, intended use and / or properties desired, various layer(s) / treatment(s)can be deposited / done on the face of the glass article or glass sheet, that faces the user.According to another embodiment of the invention, the glass article can be coated with at least oneantireflection layer. This embodiment is advantageous in the case of use of the glass article of theinvention as front cover of a screen. An antireflection layer can, for example, be a layer based onporous silica having a low refractive index or it can be composed of several layers (stack), in particular a stack of layers of dielectric material alternating layers having low and high refractive indexes andterminating in a layer having a low refractive index. According to still another embodiment of theinvention, the glass article has an antibacterial layer / treatment. Advantageously, according to thisembodiment, the glass article has said antibacterial layer / treatment on the second surface which hasbeen roughened. For example, such an antibacterial treatment could be a diffusion of silver ions in the bulk of the glass sheet close to the outer surface.Advantageously, according to one embodiment, the glass article has an anti-fingerprint layer and / orand / or easy to clean coating and / or treatment on the first surface of the glass sheet. In a preferred embodiment, the glass article has at least one anti-fingerprint layer / treatment so as to reduce or prevent fingerprints from registering. Anti-fingerprint (AFP) coating is a specialized surface treatment designed to reduce the visibility of fingerprints and smudges on surfaces. It is achieved by incorporating hydro- / oleophobic properties, making the surface hydrophobic (repelling water) and oleophilic (attracting oils), which minimizes fingerprint marks An anti-fingerprint coating may prove useful to avoid interferences of light from the viewing area. The fingerprints will be less visible from the outside, and provide for improved aesthetics. Examples of anti-fingerprint coatings include fluorinated polyethers, silanes, fluoro-silanes, siloxanes, fluorinated siloxanes, phosphonates, fluoro- organic compounds, perfluorocarbon-containing materials, and the like. These anti-fingerprint coatings are known in the art.METHOD FOR PRODUCING and USE The present invention also relates to methods for producing the glass article and for producing thedead front article of the present invention. The method comprises the following steps. Steps b) + c)and step d) that can be performed in any order :a) providing a glass sheet comprising a first surface and a second surface opposite to the firstsurface; b) depositing a coating on at least a portion, preferably on the entire area, of the secondsurface of a glass sheet; c) creating by laser ablation a perforated zone within the coating via discrete openingshaving dimension equal to or lower than 200µm and being spaced from each other by a distance equal to or lower than 200μm; Wherein the spacing distance is characterised by an average spacing and a standard deviation and wherein the standard deviation is equal to or lower than 10% of theaverage spacing and / or wherein the dimension characterised by an averagedimension and a standard deviation and wherein the standard deviation is equal to or lower than 10% of the average dimension; d) forming at least one optical roughened zone on the first surface of the glass sheet toprovide a clarity equal to or lower than 80%.The laser ablation Step c) can be performed as soon as coating deposition step b) has occurred.In a preferred embodiment, step d) wherein the at least an optical roughened zone is formed can beachieved via an etching process comprising at least the steps of : i. disposing an etch resistant mask on a portion of the first surface of the glass sheet;ii. etching the first surface of the glass sheet to provide the required clarity equal to orlower than 80%; andiii. removing the etch resistant mask.As described above, typically, the discrete openings will be typically created by directing a pulsed laserbeam onto the coating to locally remove the coating by ablation, repeatedly at different locations,thereby producing a pattern of a multitude of discrete openings defining a perforated display zone inthe coating above the screen of the display device so that the coating becomes semi-transparent inthe perforated display zone.The present invention also relates to the use of the glass article and of the dead front article for car interior application, home appliances and / or integrated interactive display. The person skilled in the art realizes that the present invention is by no means limited to the preferred embodiments described above. On the contrary, many modifications and variations are possible within the scope of the appended claims. It is further noted that the invention relates to all possiblecombinations of features, and preferred features, described herein and recited in the claims or in thedescribed embodiments. It is well understood by persons skilled in the art that, as used herein the terms “a”, “an” or “the” means at least “one” and should not be limited to “only one” unless explicitly stated otherwise. As used herein, spatial or directional terms, such as "inner", "outer", "above", "below", "top", "bottom", and the like, relate to the invention as it is shown in the drawing figures. However, it is to be understood that the invention can assume various alternative orientations and, accordingly, such terms are not to be considered as limiting. Further, all numbers expressing dimensions, physical characteristics, processing parameters, quantities of ingredients, reaction conditions, and the like, used in the specification and claims are to be understood as being modified in all instances by the term "about". Accordingly, unless indicated to the contrary, the numerical values set forth in the following specification and claims are approximations that can vary depending upon the desired properties sought to be obtained by the present invention. In the following description, unless otherwise specified, expression “substantially” mean to within 10%, preferably to within 5%. Furthermore, the terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequence, either temporally, spatially, in ranking or in any other manner. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein. When it is described that a constituent element (e.g., a first constituent element) is "(functionally or communicatively) coupled to" or is "connected to" another constituent element (e.g., a second constituent element), it should be understood that the constituent element may be directly connected to the another constituent element or may be connected to the another constituent element through another constituent element (e.g., a third constituent element).EXAMPLES Clarity measurements were performed according to ASTM standard D1003 with a BYK Haze-gard i device, using the illuminant C.Example 1 : Glass article of the present inventionA glass sheet of 1.1mm thickness (8cm x 20cm) of a type of alumino-silicate glass composition soldunder the Trademane ‘Falcon Glass’ by AGC Glass Europe was washed with an aqueous detergent and dried.An etch resistant mask was printed on the first surface of the glass sheet, as a negative image of theoptical roughened zone. The ink used for the etch resistant mask is an acrylic ink, UV curable, such as“SuperImage” inks from OCE. A masking tape is applied to the second surface of the glass sheet in order to protect it during the etching process. The glass sheet was dipped in 200 mL of an acid-etching solution at 20-25°C during 30s. The acid-etching aqueous solution comprises : NH4HF2at 10 mol%, SnCl2at 0.25 mol%, HF at 17.0 mol% and HNO315 mol%. The glass sheet is then removed from the dipping etching bath and immediately washed with an aqueous detergent. The printed mask and masking tape are removed by hot water and mechanical action (sponge or soft brush) directly after the rinsing.The optical roughened zone corresponds to the perforated zone that will be created in a further step.The glass sheet at the optical roughened zone is characterized by a clarity of 19%.A coating is then applied to the second surface of the glass sheet covering 100% of the second surface.The coating is an organic black ink material was deposited by silk screen printing in a layer of 10µmthickness. The coating has light transmission LTD4 less than 5% in the visible wavelength range.Discrete openings in the form of parallel lines are obtained by laser decoating to create a perforatedzone within the coating. The lines width is set up at 25 µm and the spacing between the lines is set at60 µm. The dimension of the discrete opening is measured by a conventional a 3D optical confocal microscope. The microscope will map the topography of an area 100 um x 100 um. From this topographic view, the dimension of 5 individual opening is measured, and the average is calculated to provide a single dimension value. This measurement is repeated 10 times with a distance of 0.5 cm between each measurement.The spacing between the discrete openings is measured by a conventional a 3D optical confocal microscope. The microscope will map the topography of an area 100 um x 100 um. From this topographic view, the spacing of two adjacent discrete openings, corresponding to the distance between the center of these 2 adjacent discrete openings is measured 5 times, and the average is calculated to provide a single spacing value. This measurement is repeated 10 times with a distance of 0.5 cm between each measurement. Values of the different measurements are present in the table below and demonstrate a very regular pattern in size and distribution: Width (µm) Spacing (µm)Line 1 24,85 60,52Line 2 25,11 60,22Line 3 25,01 60,13Line 4 24,97 61,13Line 5 24,89 58,92Line 6 25,24 59,11Line 7 25,72 59,48Line 8 24,78 59,97Line 9 24,97 60,84Line 10 25,25 59,03Average 25,08 59,9410% of the average width / spacing 2.50 5.995% of the average width / Spacing 1.25 3.002% of the average width / Spacing 0.50 1.20Standard deviation (µm) 0,27 0,78The decoating process is done with a laser source with pulse duration of 10 ps and wavelength of 1064nm. The laser beam has Gaussian profile. The laser beam is coupled to a galvo scanner equipped with an f-theta lens, which has a focal length of 100 mm. The laser beam diameter at the focus of thelens is approximately 20 um. The other laser parameters are as follows: pulse repetition rate 1 MHz,average power 16 W, scanning velocity 2750 mm / s.The above optical roughened zone has a surface of about 6cm x 13.5cm to match the size of screenand is positioned in a complementary fashion to the perforated zone. The glass article has beenpositioned above a mobile phone as a display device so that the perforated zone is positioned in acomplementary fashion to the screen of the display. The glass sheet at the optical roughened zone,provides a clarity equal of 19%, below the most preferred maximum level of 30%. As illustrated inFigure 5 (a), the glass article of the present invention when used in front of a light source, provides aperfect rendering of the marble image displayed on the mobile phone.Example 2 : comparative exampleComparative example 2 refers to the same glass sheet having the same coating deposited on thesecond surface and wherein the same perforated zone is created by the same laser ablation processwith the same regular pattern and wherein an optical roughened zone has been created incomplementary fashion to the screen.The optical roughened zone has been created by the following etching process: The glass sheet wasdipped in 200 mL of an acid-etching solution at 20-25°C during 30s. The acid-etching aqueous solution comprises : NH4HF2 at 17.2 mol%, Glycerol at 0.2 mol%, SnCl2 at 0.25 mol%, HF at 9.5 mol% and HCl23.5 mol%. The glass sheet at the optical roughened zone, provides a clarity of 84%, above themaximum level of 80%.As illustrated in Figure 5 (b), when the comparative glass article is used in front of a mobile phone asa light source picturing a marble image, the Moire large-scale interference pattern occurs and theimage is distorted by a rippled effect.Example 3 : comparative exampleComparative example 3 refers to the same glass sheet having the same coating deposited on thesecond surface and wherein the same perforated zone is created by the same laser ablation processwith the same regular pattern than in example 1. However, no optical roughened zone was created.The glass sheet provides a clarity equal 99.9%, above the maximum level of 80%.As illustrated in Figure 5 (c), when the comparative glass article is used in front of a mobile phone asa light source, picturing a marble image, the Moire large-scale interference pattern occurs and theimage is distorted by a rippled effect.Example 4 : Additional decorative optical roughened zonesIn addition to the optical roughened zone, one or more decorative roughened zones can be createdon the first surface of the glass sheet. The glass article of example 1 can further comprise twodecorative roughened zones providing a geometrical pattern as shown in Figure 4(b), that have beencreated on the first surface of the glass sheet at the exception of the surface of the optical roughenedzone. The decorative roughened zones can be created as follows:First partial roughening phaseAn etch resistant mask is printed on the first surface of the glass sheet. The pattern of the maskcorresponds to negative image of the first decorative roughened zone to be created and fully mask theoptical roughened zone. The ink used for the etch resistant mask is an acrylic ink, UV curable, such as“SuperImage” inks from OCE. A masking tape is applied to the second surface of the glass sheet in order to protect it during the etching process. The glass sheet was dipped in 200 mL of an acid-etching solution at 20-25°C during 30s. The acid-etching aqueous solution comprises : NH4HF2at 12 mol%, SnCl2at 0.20 mol%, HF at 15.0 mol% and HNO317 mol%. The glass sheet is then removed from the dipping etching bath and immediately washed with an aqueous detergent. The printed mask and masking tape are removed by hot water and mechanical action (sponge or soft brush) directly after the rinsing.The first decorative roughened zone creates the first part of the decorative pattern. It is characterizedby textures features: Ra(zone) of 370nm and Rsm(zone) of 52µm. This results in optical properties of Gloss of 23 G.U. (VLG, EHD) and diffusion of 98%, providing a very mat aspect. Typically, the non-roughened portion of the first surface has a Ra(border)= 0,5nm and Rsm(border)= 0µm (assumption for mathematical computation easiness), the roughness difference between decorative roughened and non-roughenedzones is ∆Ra = 369,5nm (│Ra(zone) - Ra(border)│ = 369,5 nm) and a ∆Rsm = 52µm (│Rsm(zone) - Rsm(border)│ =52µm). The Ra(zone) and Rsm(zone) will herein after referred to as Ra(fore) and Rsm(fore). a) Second partial roughening phaseA second partial roughening process is then achieved with the same technical parameters and conditions described above. The pattern of the mask corresponds to negative image of the seconddecorative roughened zone to be created and fully mask the optical roughened zone. The secondpartial roughening phase differs from the first roughening phase in that the glass sheet is dipped in200 mL of an acid solution at 20-25°C during 40s. The acid-etching solution comprises HF at 10 mol%and HNO3 at 25 mol%.The second roughened zone creates the second part of the decorative pattern. It is characterized bytextures features: Ra2(zone) of 280nm and Rsm2(zone) of 45µm. This results in optical properties of Glossof 50 G.U. (LG, VHD) and diffusion of 94%, providing a lighter mat aspect, reflecting more direct light.The roughness difference between the two decorative roughened zones, is ∆Ra = 90 nm, (│Ra1(zone) –Ra2(zone)│ = 90 nm) and a ∆Rsm = 7 µm, (│Rsm1(zone) – Rsm2(zone)│ = 7 µm).Ref.# FeatureA Glass article B Dead front article 1Optical roughened zone1b, 1c Decorative optical roughened zone2 Glass sheet21 First surface of the glass sheet22 Second surface of the glass sheet3 Coating4 Discrete opening4b Tapered discrete opening4i Small region of a discrete opening4bi Small region of a tapered discrete openingα Angle of the tapered discrete opening5 Perforated zone 6Screen of a display deviceΔx Extension distance of the optical roughened zone beyond the perforated zone

Claims

1. CLAIMS1. A glass article (A) comprising :a) a glass sheet (2) comprising a first surface (21) and a second surface (22) opposite to thefirst surface;b) a coating (3) disposed on at least a portion of the second surface of the glass sheet,wherein the coating has a perforated zone (5) comprising discrete openings (4) having dimension (D) equal to or lower than 200µm (D ≤ 20µm) and being spaced from eachother by a spacing distance (S) equal to or lower than 200μm (S ≤ 200µm); andwherein the spacing distance is characterised by an average spacing and a standarddeviation and wherein the standard deviation is equal to or lower than 10% of the averagespacing and / or wherein the dimension is characterised by an average dimension and astandard deviation and wherein the standard deviation is equal to or lower than 10% of the average dimension;- wherein the first surface comprises at least one roughened zone (1) positioned in acomplementary fashion to the perforated zone; and- wherein the glass sheet within the at least one optical roughened zone, provides a clarityequal to or lower than 80% (clarity ≤ 80%), preferably equal to or lower than 50% (clarity≤ 50%), more preferably equal to or lower than 30% (clarity ≤ 30%).

2. A glass article according to claim 1 wherein the standard deviation of the spacing distanceis equal to or lower than 5% of the average spacing, preferably equal to or lower than 2%of the average spacing.

3. A glass article according to any one of the preceding claims wherein the standarddeviation of the dimension is equal to or lower than 5% of the average dimension,preferably equal to or lower than 2% of the average dimension.

4. A glass article according to any one of the preceding claims wherein the spacing distanceis equal to or lower than 150μm (S ≤ 150µm), more preferably is equal to or lower than100µm (S ≤ 100µm).

5. A glass article according to any one of the preceding claims wherein the discrete openingsare in the shape of lines having a width (W) equal to or lower than 30μm (W ≤ 30µm),preferably equal to or lower than 20μm (W ≤ 20µm), more preferably equal to or lower than 10µm (W ≤ 10µm).

6. A glass article according to any one of the preceding claims wherein the coating is a inklayer, preferably an organic based ink, more preferably an acrylic ink or an epoxy ink.

7. A glass article according to claim 6, wherein the ink layer exhibits a TLD4 lighttransmittance equal to or lower than 50% (TLD4 ≤ 50%), preferably equal to or lower than 30% (TLD4 ≤ 30%), preferably equal to or lower than 10% (TLD4 ≤ 10%), preferably equal to or lower than 5% (TLD4 ≤ 5%) and more preferably equal to or lower than 2% (TLD4 ≤ 2%) wherein TLD4 is determined according to the ISO9050 standard for a thickness of 4 mm at a solid observation angle of 2° (with illuminant D65) and for a wavelength range between 380 and 780 nm.

8. A glass article according to any one of the preceding claims 6 to 7 wherein the ink layerhas a thickness (T) equal to or greater than 1 μm (T ≥ 1 µm), preferably equal to or greaterthan 2 μm (T ≥ 2 µm), preferably equal to or greater than 3 μm (T ≥ 3 µm), more preferably equal to or greater than 5 μm (T ≥ 5 µm) and / or equal to or lower than 40 µm (T ≤ 40 µm), preferably equal to or lower than 30 µm (T ≤ 30 µm), preferably equal to or lower than 25 µm (T ≤ 25 µm), preferably equal to or lower than 20 µm (T ≤ 20 µm), preferably equal to or lower than 15 µm (T ≤ 15 µm), more preferably equal to or lower than 12 µm (T ≤ 12 µm).

9. A glass article according to any one of the preceding claims 6 to 8 wherein the ink layerhas an average thickness and a standard deviation; and wherein the standard deviation is equal to or lower than the lowest of either (a) 3µm or (b) 20% of the average thickness.

10. A glass article according to any one of the preceding claims wherein the at least oneroughened zone has a roughened surface; the perforated zone has a perforated surfaceand perforated perimeter; and wherein the roughened surface extends over theperforated surface, by an extension distance (Δx) from the perforated zone perimeter, wherein the extension distance is preferably calculated by the following formula: ∆^ = 2.1 ∗ T / ^ ∗ (^−^)wherein ^Δx is the extension distance expressed in mm,^ T thickness of the glass sheet expressed in mm,^ n is glass refractive index of the glass sheet,^ W is the average width of the discrete openings, expressed in mm, and^ D the average spacing distance of the discrete openings, expressed in mm11. A glasss article according to any one of the preceding claims wherein the thickness of theglass sheet is equal to or lower than 2mm, preferably equal to or lower than 1.6mm, more preferably equal to or lower than 1.3mm.

12. A glass article according to any one of the preceding claims wherein the glass sheet is astrengthened glass sheet, preferably a chemically strengthened glass sheet.

13. A glass article according to any one of the preceding claims wherein the first surface ofthe glass sheet is coated with an anti-finger print coating.

14. A dead front article (B) comprising the glass article (A) according to any one of thepreceding claims and at least a display device having at least a screen (6) wherein the second surface (22) of the glass sheet is facing the display device and wherein screen is positioned in a complementary fashion to the perforated zone (5).

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