Classifications

• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
  • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
  • G02B1/11—Anti-reflection coatings
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
  • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
  • C03C17/3411—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions with at least two coatings of inorganic materials
  • C03C17/3417—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions with at least two coatings of inorganic materials all coatings being oxide coatings
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B27/00—Tempering or quenching glass products
  • C03B27/012—Tempering or quenching glass products by heat treatment, e.g. for crystallisation; Heat treatment of glass products before tempering by cooling
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
  • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/20—Filters
  • G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C2217/00—Coatings on glass
  • C03C2217/20—Materials for coating a single layer on glass
  • C03C2217/21—Oxides
  • C03C2217/212—TiO2
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C2217/00—Coatings on glass
  • C03C2217/20—Materials for coating a single layer on glass
  • C03C2217/21—Oxides
  • C03C2217/218—V2O5, Nb2O5, Ta2O5
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C2217/00—Coatings on glass
  • C03C2217/20—Materials for coating a single layer on glass
  • C03C2217/21—Oxides
  • C03C2217/22—ZrO2
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C2217/00—Coatings on glass
  • C03C2217/70—Properties of coatings
  • C03C2217/73—Anti-reflective coatings with specific characteristics
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C2218/00—Methods for coating glass
  • C03C2218/10—Deposition methods
  • C03C2218/15—Deposition methods from the vapour phase
  • C03C2218/154—Deposition methods from the vapour phase by sputtering
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C2218/00—Methods for coating glass
  • C03C2218/30—Aspects of methods for coating glass not covered above
  • C03C2218/365—Coating different sides of a glass substrate

Definitions

• This invention relates to a coated article including a glass substrate.
• a first coating is provided on a first side of the glass substrate, and a second coating is provided on the second side of the glass substrate.
• the coatings are designed to reduce color change of the overall coated article, from the perspective of a viewer, upon heat treatment (e.g., thermal tempering), and/or to have respective reflective coloration that substantially compensate for each other to render the overall coated article for neutral in appearance to an intended viewer.
• the coatings may be antireflective (AR) coatings in certain example embodiments.
• the first and second coatings may experience different respective visible reflective color changes upon heat treatment (HT) which substantially offset each other, so that the coated article looks similar to the viewer with respect to color both before and after such heat treatment.
• HT visible reflective color change upon heat treatment
• visible color change due to HT e.g., thermal tempering
• Such coated articles may be used in the context of monolithic windows, storefront windows, museum glass showcases, picture frame glass, retail display case windows, table tops, insulating glass (IG) window units, laminated windows, and/or other suitable applications.
• IG insulating glass
• Coated articles having double sided AR coatings comprise first and second AR coatings on opposite sides of a glass substrate. Such coated articles are often subjected to heat treatment such as thermal tempering. Unfortunately, such coated articles have substantially different appearances with respect to color before and after heat treatment, respectively (high reflective ⁇ * values). In other words, the heat treatment causes significant change in reflective coloration of the coated article. This is undesirable because non-heat-treated and heat treated coated articles will have significantly different appearances from the perspective of a viewer. [0003] Moreover, it has been found that it is particularly difficult to design a given AR coating to have a low reflective ⁇ * value. In other words, it has been found that it is difficult to design AR coatings to have low reflective color shift upon heat treatment such as thermal tempering.
• a coated article such as a double sided AR coated article with AR coatings on both sides of a glass substrate, where the coated article has reduced color shift upon heat treatment such as thermal tempering.
• Example embodiments of this invention relate to a coated article including a glass substrate, where a first coating is provided on a first side of the glass substrate and a second coating is provided on the second side of the glass substrate.
• the coatings may be provided directly, or indirectly, on the glass substrate.
• the coatings are designed to reduce color change of the overall coated article, from the perspective of a viewer, upon heat treatment (e.g., thermal tempering), and/or to have respective reflective colorations that substantially compensate for each other to render the overall coated article for neutral in appearance to an intended viewer.
• the coatings may be antireflective (AR) coatings in certain example embodiments.
• the first and second coatings may experience different respective visible reflective color changes upon heat treatment (HT) which substantially offset or substantially compensate each other, so that the coated article looks similar to the viewer with respect to color both before and after such heat treatment.
• the first coating may have a positive reflective a* value and the second coating may have a negative reflective a* value, before and/or after HT, in order to compensate for each other in the overall product.
• the first coating may experience a reflective a* color value shift in a first direction due to heat treatment (HT), and the second coating may experience a reflective a* color shift in a second direction (positive or negative) substantially opposite to the first direction due to the HT.
• the first coating may experience a positive reflective a* color value shift due to HT, while the second coating experiences a negative reflective a* color shift due to the HT.
• visible color change due to HT e.g., thermal tempering
• the first and second coatings are designed so that the coated article realizes substantially neutral color, from the perspective of a viewer, both before and after HT.
• a method of making a transparent coated glass product comprising: having a coated article comprising a first coating provided on a first side of a glass substrate and a second coating provided on a second side of the glass substrate, so that the glass substrate is located between at least the first and second coatings; and heat treating the coated article at a temperature of at least 580 degrees C so that the heat treating (i) causes the first coating on the glass substrate to realize a reflective a* color value shift in a positive direction from the perspective of an intended viewer due to the heat treating, and (ii) causes the second coating on the glass substrate to realize a reflective a* color value shift in a negative direction from the perspective of the intended viewer due to the heat treating.
• a coated article including a first coating and a second coating supported by a glass substrate, the coated article comprising: the first coating provided on a first side of the glass substrate; the second coating provided on a second side of the glass substrate, so that the glass substrate is located between at least the first and second coatings; wherein, from the perspective of a viewer of the coated article, the first coating on the glass substrate has a positive a* reflective color, and the second coating on the glass substrate has a negative a* reflective color.
• a coated article including a first coating and a second coating supported by a glass substrate, the coated article comprising: the first coating provided on a first side of the glass substrate, wherein the first coating comprise a plurality of dielectric layers having different refractive indices; the second coating provided on a second side of the glass substrate, so that the glass substrate is located between at least the first and second coatings, and wherein the second coating comprises a plurality of dielectric layers having different refractive indices; wherein the first coating on the glass substrate is configured to, upon heat treatment at a temperature of at least 580 degrees C (e.g., thermal tempering, heat bending, and/or heat strengthening), provide a reflective a* color value shift in a positive direction from the perspective of the viewer due to the heat treatment, and the second coating on the glass substrate is configured to, upon the heat treatment, provide a reflective a* color value shift in a negative direction from the perspective of the viewer due to the heat treatment.
• the first coating on the glass substrate is configured to, upon heat treatment at
• FIG. 1 is a cross sectional view of a monolithic coated article (heat treated or not heat treated) according to an example embodiment of this invention.
• FIG. 2 is a cross sectional view of a monolithic coated article (heat treated or not heat treated) according to another example embodiment of this invention.
• Fig. 3 is a color graph illustrating how first and second coatings, on opposite sides of the glass substrate, experience color shifts in opposite or substantially opposite directions due to heat treatment from the perspective of a viewer of the coated article; Fig. 3 may relate to the Fig. 1 and/or Fig. 2 embodiment(s).
• Fig. 4 is a side cross sectional view of the Fig. 1 and 2 embodiments, illustrating reflective visible light from the two coatings that are viewed by the viewer.
• Example embodiments of this invention relate to a coated article including a glass substrate 1, where a first coating 10 (or 20) is provided on a first side of the glass substrate 1 and a second coating 20 (or 10) is provided on the second side of the glass substrate 1.
• the coatings 10 and 20 may be provided directly, or indirectly, on the glass substrate 1.
• the coatings 10 and 20 are designed to reduce color change of the overall coated article, from the perspective of a viewer, upon heat treatment (e.g., thermal tempering).
• the coatings 10 and 20 may be antireflective (AR) coatings in certain example embodiments.
• the first and second coatings 10 and 20 may experience different respective visible reflective color changes upon heat treatment (HT) which substantially offset or substantially compensate each other, so that the coated article looks similar to the viewer with respect to color both before and after such heat treatment.
• the first coating 10 (or 20) may have a positive reflective a* color value and the second coating 20 (or 10) may have a negative reflective a* color value, before and/or after HT, in order to compensate for each other in the overall product and allow for a substantially neutral appearance to the viewer (e.g., see Fig. 3).
• the first coating 10 (or 20) may have a positive reflective b* color value and the second coating 20 (or 10) may have a negative reflective b* color value, before and/or after HT, in order to compensate for each other in the overall product and allow for a substantially neutral appearance to the viewer (e.g., see Fig. 3).
• the first coating 10 (or 20) may experience a reflective a* color value shift in a first direction due to heat treatment (HT), and the second coating 20 (or 10) may experience a reflective a* color shift in a second direction (positive or negative) substantially opposite to the first direction due to the HT.
• the first coating 10 may experience a positive reflective a* color value shift due to HT, while the second coating 20 (or 10) experiences a negative reflective a* color shift due to the HT (e.g., see Fig. 3).
• visible color change due to HT e.g., thermal tempering
• the first and second coatings 10 and 20 are designed so that the coated article realizes substantially neutral color, from the perspective of a viewer, both before and after HT.
• the first and second coatings 10 and 20 may have the same, or different, layer stacks in different embodiments of this invention.
• adjustment of thicknesses of particular layer(s) can be used to cause the coatings to have different reflective color shift upon HT so that from the perspective of a viewer of the coated article the first coating 10 (or 20) may experience a positive reflective a* color value shift due to HT while the second coating 20 (or 10) experiences a negative reflective a* color shift due to the HT.
• Such coated articles may be used in the context of monolithic windows, storefront windows, museum glass showcases, picture frame glass, retail display case windows, table tops, insulating glass (IG) window units, laminated windows, and/or other suitable applications.
• IG insulating glass
• example embodiments of this invention relate to an anti-reflective coating article which can achieve reflective neutral visible coloration, both before and after heat treatment such as thermal tempering, which is advantageous for the reasons discussed herein. This is achieved in example embodiments of this invention by provide two AR coatings 10, 20 on opposite sides of the glass substrate 1, where the reflective coloration of the two AR coatings compensate for each other both before and after optional HT.
• Fig. 4 is a cross sectional view of an example embodiment of this invention, applicable to Figs. 1-3.
• a first coating 10 (or 20) is provided on a first side of the glass substrate 1 and a second coating 20 (or 10) is provided on the second side of the glass substrate 1.
• Coating 10 causes a portion of the visible light incident upon the coated article to be reflected by the coated article toward the viewer as light A'
• coating 20 causes a portion of the visible light incident upon the coated article which passes through coating 10 and glass substrate 1 to be reflected back toward the viewer as light B ⁇
• Example embodiments of this invention design coatings 10 and 20 so that they are complimentary coating, such that the coated article realizes substantially neutral reflective color, when reflected light A' and reflected light B' are combined, in both heat treated and non-heat-treated applications with the same coatings.
• the coatings 10 and 20 may be designed to have opposite reflective color shifts (e.g., opposite a* and/or b* color shifts) upon heat treatment, so that the reflective color shift upon HT of one coating 10 compensates or substantially compensates for the reflective color shift upon HT of the other coating 20.
• the coated article will appear similar to the viewer, with respect to visible reflected coloration, both before and after HT. This advantageously allows both HT and non-HT versions of a given coated article to be used next to each other, without having different appearances to a viewer.
• coating 10 may experience a reflective a* color value shift in a first direction due to heat treatment (HT), and the second coating 20 (or 10) may experience a reflective a* color shift in a second direction (positive or negative) substantially opposite to the first direction due to the HT.
• the first coating 10 (or 20) may experience a positive reflective a* color value shift due to HT
• the second coating 20 (or 10) experiences a negative reflective a* color shift due to the HT.
• first and second coatings 10 and 20 are designed so that the coated article realizes substantially neutral color, from the perspective of a viewer, both before and after HT.
• the first and second coatings 10 and 20 may have the same, or different, layer stacks in different embodiments of this invention.
• first and second coatings 10 and 20 have the same, or substantially the same, layer stacks
• adjustment of thicknesses of particular layer(s) can be used to cause the coatings to have different reflective color shift upon HT and/or opposite a* and/or b* values before and/or after HT, so that from the perspective of a viewer of the coated article the coated article has substantially neutral reflective coloration and/or the first coating 10 (or 20) may experience a positive reflective a* color value shift due to HT while the second coating 20 (or 10) experiences a negative reflective a* color shift due to the HT.
• Coated articles may optionally be “heat treated” (HT) in certain example embodiments of this invention, and are preferably designed to be heat treatable.
• the terms "heat treatment”, “heat treated” and “heat treating” as used herein mean heating the article to a temperature sufficient to achieve thermal tempering, heat bending, and/or heat strengthening of the glass inclusive article.
• This definition includes, for example, heating a coated article in an oven or furnace at a temperature of least about 580 degrees C, more preferably at least about 600 degrees C, for a sufficient period to allow tempering, bending, and/or heat strengthening.
• the HT may be for at least about 4 or 5 minutes.
• the coated article may or may not be heat treated in different embodiments of this invention.
• Figure 1 is a cross sectional view of a coated article according to an example embodiment of this invention.
• antireflective (AR) coating 10 is provided on one side of glass substrate 1
• another AR coating 20 is provided on the other side of glass substrate 1.
• the materials of the respective layers of coatings 10 and 20 may be of the same material, but layer thicknesses between the two coatings may vary and in particular are designed so that the coatings have different reflective coloration values as discussed herein.
• coatings 10 and 20 do not contain any infrared (IR) reflecting layer based on silver or gold.
• IR infrared
• Glass substrate 1 may be from about 1.0 to 12.0 mm thick, more preferably from about 4-8 mm thick, with an example glass substrate thickness being about 6 mm thick. All layers shown in Fig. 1 are transparent dielectric layers, and all may be deposited via sputter-deposition or any other suitable technique. Multi-layer AR coatings offer broad antireflection regions in the spectrum, and may for example be based on AR principles of quarter-half-quarter), where moving outwardly from the glass the coatings may each include a quarter wave medium index layer, a half wave high index layer, a quarter wave low index layer, and then air.
• All layers shown in Fig. 1 are transparent dielectric layers, and all may be deposited via sputter-deposition or any other suitable technique.
• Multi-layer AR coatings offer broad antireflection regions in the spectrum, and may for example be based on AR principles of quarter-half-quarter), where moving outwardly from the glass the coatings may each include a quarter wave medium index layer, a half wave high index layer, a
• AR coating 10 includes layers 2, 3, 4 and 5
• AR coating 20 includes layers 2', 3', 4' and 5'.
• layers 2, 2', 4, and 4' are high index layers having a refractive index (n) of at least about 2.15, more preferably of at least about 2.20, and most preferably of at least about 2.25.
• High index layers 2, 2', 4 and 4' may each be of or including high index transparent dielectric material such as titanium oxide (e.g., TiOx, where x is from 1.5 to 2.0, more preferably from 1.8 to 2.0, with an example being TiO 2 ) or niobium oxide (e.g., NbO x where x is from 1.4 to 2.1, more preferably from 1.5 to 2.0, with examples being Nb 2 O 5 and NbO 2 ).
• titanium oxide e.g., TiOx, where x is from 1.5 to 2.0, more preferably from 1.8 to 2.0, with an example being TiO 2
• niobium oxide e.g., NbO x where x is from 1.4 to 2.1, more preferably from 1.5 to 2.0, with examples being Nb 2 O 5
• Layers 3, 3', 5 and 5' are low index layers having a refractive index (n) of less than about 1.8, more preferably less than about 1.7, and most preferably less than about 1.6.
• Low index layers 3, 3', 5 and 5' may each be of or including low index transparent dielectric material such as silicon oxide (e.g., SiO 2 ) or any other suitable low index material.
• the silicon oxide (e.g., SiO 2 ) of any of layers 3, 3', 5 and/or 5' may be doped with other materials such as aluminum (Al) and/or nitrogen (N) in certain example embodiments of this invention.
• any of layers 3, 3', 5 and/or 5' may be of or including silicon oxide (e.g., SiO 2 ) and include from about 0-8% (more preferably from 1-5%) Al and/or from about 0-10% (more preferably from about 1-5%) N.
• the titanium oxide and/or niobium oxide of the high index layers may also be doped with other materials in certain example embodiments.
• each of the layers may include other materials such as dopants. It will be appreciated of course that other layers may also be provided, or certain layers may be omitted, and different materials may be used, in certain alternative embodiments of this invention.
• oxide and "nitride” as used herein include various stoichiometries.
• silicon oxide includes stoichiometric S1O2, as well as non-stoichiometric silicon oxide.
• titanium oxide includes stoichiometric T1O2, as well as non-stoichiometric titanium oxide.
• other layer(s) may also be provided in other locations of the coatings.
• the coatings 10 and 20 or layers thereof is/are “on” or “supported by” substrate 1 (directly or indirectly), other layer(s) may be provided therebetween.
• a layer or coating is considered “on” the substrate 1 even when other layer(s) may be provided therebetween (i.e., the terms “on” and “supported by” as used herein are not limited to directly contacting).
• example thicknesses in angstroms
• materials for the respective layers of the Fig. 1 embodiment on the glass substrate 1 are as follows in certain example embodiments for achieving desired visible transmission, low visible reflection, fairly neutral reflective coloration, and desired reflective color shift upon optional HT (layers are listed in order moving away from the glass substrate 1).
• Table 1 provides example materials and thicknesses for AR coating 10
• Table 2 provides example materials and thicknesses for AR coating 20, before and/or after optional HT.
• Table 1 Coating 10 Materials/Thicknesses in Fig. 1 embodiment
• Ti0 2 ; layer 2' 40-200 A 60-120 A 80-105 A silicon oxide (e.g., Si0 2 ; layer 3'): 100-800 A 200-600 A 300-420 A niobium oxide (layer 4'): 300-2000 A 800-1500 A 1000-1300 A silicon oxide (e.g., Si0 2 ; layer 5'): 100-1500 A 700-890 A 750-850 A
• low index layer 5 in coating 10 is physically thicker than low index layer 5' in coating 20 by at least 75 A, more preferably by at least 100 A, most preferably by at least 130 A.
• this thickness difference in layer 5 compared to layer 5' significantly affects visible reflective color values to such an extent that it allows for: (i) the first and second coatings 10 and 20 on glass to experience different respective visible reflective color changes upon heat treatment (HT) which substantially offset or substantially compensate each other, so that the coated article looks similar to the viewer with respect to color both before and after such heat treatment; (ii) from the perspective of a viewer of the coated article, one coating can have a positive reflective a* color value and the other coating can have a negative reflective a* color value, before and/or after HT, in order to compensate for each other in the overall product and allow for a substantially neutral appearance to the viewer; (iii) from the perspective of a viewer of the coated article, one coating can have a positive reflective b* color value and the other coating can have a negative reflective b* color value, before and/or after HT, in order to compensate for each other in the overall product and allow for a substantially neutral appearance to the viewer; (iv) from the perspective of a viewer of the coated
• coated articles according to the Fig. 1 embodiment have color/optical characteristics as follows in Table 3 according to Illuminant C, 2 degree observer. It is noted that TY and T v i S stand for visible transmission through the Fig. 1 coated article in Table 3, RY stands for visible reflectance of the Fig. 1 coated article from the point of view of the intended viewer in Table 3, and that the a* and b* values under RY stand for the respective CIE visible reflectance colorations of the overall Fig. 1 coated article from the point of view of the intended viewer and indicate neutral reflective coloration of the overall coated article in the Fig. 1 embodiment. Table 3 : Optical Characteristics (Fig. 1 coated article)
• Fig. 1 embodiment has high visible transmission, low visible reflectance due to the AR coatings 10 and 20, and neutral appearance from the point of view of the intended viewer.
• the a* and b* color values discussed herein are from the point of view of the intended viewer of the coated article.
• both coatings 10 and 20 contribute to reflective coloration of the coated article shown in Fig. 1, we have broken out each coating alone on a glass substrate 1 for purposes of analysis and optical characteristics. For purposes of analyzing a coated article according to the Fig. 1 embodiment, this is an appropriate technique.
• Table 4 sets forth optical data for coating 10 alone on a glass substrate
• Table 4 sets forth the visible transmission (TY), visible reflectance (RY), reflective a* color value, and reflective b* color value of a coated article including glass substrate 1 and coating 10, from the perspective of the intended viewer shown in Fig. 1, according to certain example embodiments of this invention.
• coatings 10 and 20 can be interchanged with each other in certain example embodiments of this invention.
• Table 4 Optical Characteristics (Coating 10 on glass; Fig. 1 ; pre-HT)
• Table 5 sets forth optical data for coating 10 alone on a glass substrate
• Table 5 sets forth the visible transmission (TY), visible reflectance (RY), reflective a* color value, and reflective b* color value of a coated article including glass substrate 1 and coating 10, from the perspective of the intended viewer shown in Fig. 1, according to certain example embodiments of this invention post-HT.
• an a* shift from +3 to +6 would be a shift in the positive direction because the a* value becomes more positive.
• an a* shift from -4 to -1 would be a shift in the positive direction because the a* value becomes more positive.
• an a* shift from -1 to +3 would be a shift in the positive direction because the a* value becomes more positive.
• Table 6 sets forth optical data for coating 20 alone on a glass substrate
• Table 6 sets forth the visible transmission (TY), visible reflectance (RY), reflective a* color value, and reflective b* color value of a coated article including glass substrate 1 and coating 20, from the perspective of the intended viewer shown in Fig. 1, according to certain example embodiments of this invention.
• coatings 10 and 20 can be interchanged with each other in certain example embodiments of this invention.
• Table 7 sets forth optical data for coating 20 alone on a glass substrate
• Table 7 sets forth the visible transmission (TY), visible reflectance (RY), reflective a* color value, and reflective b* color value of a coated article including glass substrate 1 and coating 20, from the perspective of the intended viewer shown in Fig. 1, according to certain example embodiments of this invention post-FTT.
• Table 7 Optical Characteristics (Coating 20 on glass; Fig. 1; post-HT)
• HT of a glass substrate with coating 20 thereon causes the reflective a* color value to shift in the negative direction (opposite to the a* shift caused by coating 10) from the perspective of the intended viewer.
• an a* shift from -1 to -5 would be a shift in the negative direction because the a* value becomes more negative.
• an a* shift from +1 to -3 would be a shift in the negative direction because the a* value becomes more negative.
• an a* shift from +5 to +1 would be a shift in the negative direction because the a* value becomes more negative.
• coating 10 on glass provides a positive reflective a* color value to the viewer whereas coating 20 on glass provides a negative reflective a* color value to the viewer, before and/or after HT, so that the coatings compensate for each other so that the overall coated article from the perspective of the intended viewer has a more neutral coloration than the coloration caused by coating 10 alone or coating 20 alone on glass.
• coating 10 on glass provides a negative reflective b* color value to the viewer whereas coating 20 on glass provides a positive reflective b* color value to the viewer, before and/or after HT, so that the coatings compensate for each other so that the overall coated article from the perspective of the intended viewer has a more neutral coloration than the coloration caused by coating 10 alone or coating 20 alone on glass.
• Fig. 3 shows that one coating (e.g., coating 10), identified as coating "2" in Fig. 3, provides a positive reflective a* color value to the viewer whereas another coating (e.g., coating 20), identified as coating "1" in Fig. 3, provides a negative reflective a* color value to the viewer, before and after HT, so that the coatings compensate for each other so that the overall coated article from the perspective of the intended viewer has a more neutral coloration than the coloration caused by coating 10 alone or coating 20 alone.
• AC2 stands for as-coated coating 2 (pre-HT)
• HT2 stand for heat treated coating 2.
• AC1 stands for as- coated coating 1 (pre-HT)
• HTl stand for heat treated coating 1.
• one coating e.g., coating 10
• coating "2" in Fig. 3 provides a negative reflective b* color value to the viewer
• the other coating e.g., coating 20
• coating "1" in Fig. 3 provides a positive reflective b* color value to the viewer, before and after HT, so that the coatings compensate for each other so that the overall coated article from the perspective of the intended viewer has a more neutral coloration than the coloration caused by coating 10 alone or coating 20 alone.
• Fig. 3 also shows that HT of the glass substrate 1 with the two coatings 1 and 2 (e.g., 20 and 10) on opposite sides thereof results in one coating (e.g., coating 10), identified as coating "2" in Fig. 3, causing the reflective a* color value to shift in the positive direction (to the right in Fig. 3), and the other coating (e.g., coating 20), identified as coating "1" in Fig. 3, causing the reflective a* color value to shift in the negative direction (to the left in Fig. 3) from the perspective of the intended viewer.
• this advantageously allows the two coatings to compensate for each other upon HT so that the overall coated article from the perspective of the intended viewer has a more neutral coloration than the coloration caused by coating 10 alone or coating 20 alone after FTT.
• Comparative Example (CE) 1 is a glass substrate 1 with AR coatings
• Example 1 is also a glass substrate 1 with AR coatings Ex. la and Ex. lb on opposite sides thereof as shown in Fig. 1.
• Layer thicknesses below are in angstroms (A).
• Example la is similar to coating 20 in Fig. 1
• Example lb is similar to coating 10 in Fig. 1.
• “L” stands for layer in the table below, so that for example L2 stands for layer 2, L3 stands for layer 3, and so forth. The layers below move from the glass substrate 1 outward.
• CEla 89 A 397 A 1202 A 852 A
• CElb 88 A 387 A 1171 A 806 A
• Example 1 A key difference between Example 1 (with coatings la and lb), compared to Comparative Example CE1 (with coatings CEla and CElb), on the same glass substrate 1, is the thickness of the outermost silicon oxide layer 5, 5'.
• the thicknesses of layers 2 and 2', 3 and 3', and 4 and 4' are similar in all examples.
• layer 5 in Example 1 (Ex. lb; coating 10; layer 5) at 963 A is substantially thicker than layer 5' at 796 A in Example 1 (Ex. la; coating 20; layer 5').
• low index layer 5 in coating 10 is physically thicker than low index layer 5' in coating 20 by at least 75 A, more preferably by at least 100 A, and most preferably by at least 130 A, with an example range being from about 100-250 A thicker, or from about 120-210 A thicker). It has surprisingly and unexpectedly been found that this difference in thickness between layers 5 and 5' provides for a significant change in a* and b* values before and after HT, and for a different direction of a* color shift upon HT (see optical data below).
• CElb of Comparative Example 1 on the glass substrate had negative reflective a* values from the perspective of the intended viewer.
• the change in thickness between layers 5 and 5' mentioned above in Example 1 surprisingly and unexpectedly caused the coating Ex. la (coating 20) on the glass substrate to have a negative reflective a* value, but the coating Ex. lb (coating 10) on the glass substrate to have a positive reflective a* value.
• the positive and negative a* values caused by the coatings 10 and 20, respectively substantially compensate for each other so that the overall coated article (see Fig. 1) with both coatings thereon appears more neutral in color compared to CE1 to the viewer.
• Comparative Example 1 has a negative reflective a* value from the perspective of the viewer which is much further from the central origin in Fig. 3 (and thus less neutral) compared to the a* value of Example 1.
• Comparative Example 1 has a positive reflective b* value from the perspective of the viewer (caused by both coatings causing a positive b* reflective color) which is much further from the central origin in Fig. 3 (and thus less neutral) compared to the reflective b* value of Example 1 where the negative b* value of coating 10 (Ex. lb) compensates for the positive b* value of coating 20 (Ex. la).
• CElb of Comparative Example 1 on the glass substrate had negative reflective a* values from the perspective of the intended viewer, and that the HT caused the reflective a* values to shift even further to the negative for both CEla and CElb.
• the HT caused Comparative Example 1 to shift significantly away from neutral. While Comparative Example 1 was close to neutral prior to HT with reflective a* values of - 1.13 and -1.71, it is no longer close to neutral after HT because its reflective a* values have shifted well away from neutral to values of -3.40 and -5.10 which are both negative.
• the change in thickness between layers 5 and 5' mentioned above in Example 1 surprisingly and unexpectedly caused the coating Ex.
• the positive and negative a* values caused by the coatings 10 and 20, respectively, substantially compensate for each other so that the overall coated article (see Fig. 1) with both coatings thereon appears more neutral in color compared to CE1 to the viewer.
• Comparative Example 1 has a very negative reflective a* value around -4 from the perspective of the viewer which is much further from the central origin in Fig. 3 (and thus less neutral) compared to the a* value of Example 1 which would be just slightly negative as the -3.85 and +2.30 values substantially compensate for each other.
• Table 10 It can also be seen in Table 10 above that, after HT, both coatings CEla and CElb of Comparative Example 1 on the glass substrate had positive reflective b* values from the perspective of the intended viewer.
• the change in thickness between layers 5 and 5' mentioned above in Example 1 surprisingly and unexpectedly caused the coating Ex. la (coating 20) on the glass substrate to have a positive reflective b* value, but the coating Ex.
• Comparative Example 1 has a positive reflective b* value from the perspective of the viewer (caused by both coatings causing a positive b* reflective color) which is much further from the central origin in Fig. 3 (and thus less neutral) compared to the reflective b* value of Example 1 where the negative b* value of coating 10 (Ex. lb) substantially compensates for the positive b* value of coating 20 (Ex. la) to make Example 1 appears more neutral to the viewer.
• Figure 2 is a cross sectional view of a coated article according to an example embodiment of this invention.
• the coating stacks in the Fig. 2 embodiment are the same as in the Fig. 1 embodiment and have the same goals/purposes, except that layers 4a, 4a', 6 and 6' have been added in the Fig. 2 embodiment.
• antireflective (AR) coating 10 is provided on one side of glass substrate 1
• another AR coating 20 is provided on the other side of glass substrate 1.
• All layers shown in Fig. 2 are transparent dielectric layers, and all may be deposited via sputter-deposition or any other suitable technique. As explained above in connection with Fig. 1, in both Figs.
• layers 2, 2', 4, and 4' are high index layers having a refractive index (n) of at least about 2.15, more preferably of at least about 2.20, and most preferably of at least about 2.25.
• High index layers 2, 2', 4 and 4' may each be of or including high index transparent dielectric material such as titanium oxide or niobium oxide.
• layers 3, 3', 5 and 5' are low index layers having a refractive index (n) of less than about 1.8, more preferably less than about 1.7, and most preferably less than about 1.6.
• Low index layers 3, 3', 5 and 5' may each be of or including low index transparent dielectric material such as silicon oxide (e.g., S1O2) or any other suitable low index material.
• medium index layers 4a and 6 have been added to coating 10
• medium index layers 4a' and 6' have been added to coating 20
• medium index layers 4a, 4a', 6 and 6' have each have a refractive index (n) of from 1.70 to 2.10, more preferably from 1.75 to 2.0, and even more preferably from 1.75 to 1.95.
• medium index layers 4a and 4a' may be of a medium index material such as a combination of niobium oxide and silicon oxide (also known as niobium silicon oxide) as shown in Fig. 2, or a combination of titanium oxide and silicon oxide (also known as titanium silicon oxide), or any other suitable medium index material.
• medium index layers 6 and 6' may be of a medium index material such as a combination of zirconium oxide and silicon oxide (also known as zirconium silicon oxide) as shown in Fig. 2, or any other suitable medium index material. And the zirconium in layers 6 and 6' helps improve durability of the respective coatings 10 and 20. It is also noted that stack sequences from either the Fig. 1 or Fig. 2 embodiment may be repeated, so that for example another sequence of layers 2-6 could be provided on top of the layers illustrated in each coating in Fig. 2.
• example thicknesses in angstroms
• materials for the respective layers of the Fig. 2 embodiment on the glass substrate 1 are as follows in certain example embodiments for achieving desired visible transmission, low visible reflection, low or fairly neutral reflective coloration, and desired reflective color shift upon optional HT (layers are listed in order moving away from the glass substrate 1).
• Table 1 1 provides example materials and thicknesses for AR coating 10
• Table 12 provides example materials and thicknesses for AR coating 20, before and/or after optional HT.
• Table 11 Coating 10 Materials/Thicknesses in Fig. 2 embodiment
• Zirconium silicon oxide (layer 6): 30-400 A 40-200 A 50-150 A
• Tables 1 1 and 12 above demonstrate that a significant difference between coatings 10 and 20 is the thickness of low index layer 5 compared to the thickness of low index layer 5'.
• low index layer 5 in coating 10 is physically thicker than low index layer 5' in coating 20 by at least 75 A, more preferably by at least 100 A, even more preferably by at least 130 A, and most preferably by at least 160 A. It has surprisingly and unexpectedly been found that this thickness difference in layer 5 compared to layer 5' significantly affects visible reflective color values to such an extent that it allows for: (i) the first and second coatings 10 and 20 on glass to experience different respective visible reflective color changes upon heat treatment (HT) which substantially offset or substantially
• one coating may experience a reflective a* color value shift in a positive direction due to HT and the other coating may experience a reflective a* color shift in a negative direction due to the HT so that visible reflective color change due to HT (e.g., thermal tempering) can be reduced or minimized so that non-heat- treated versions and heat treated versions of the coated article appear similar to the viewer; and possibly (iii) from the perspective of a viewer of the coated article, one coating may experience a reflective b* color value shift in a positive direction due to HT and the other coating may experience a reflective b* color shift in a negative direction due to the HT so that visible reflective color change due to HT (e.g., thermal tempering) can be reduced.
• the examples discussed herein provide evidence of these unexpected and surprising results.
• coated articles according to the Fig. 2 embodiment have color/optical characteristics as follows in Table 13 according to Illuminant C, 2 degree observer. It is noted that TY and T v i S stand for visible transmission through the Fig. 2 coated article in Table 13, RY stands for visible reflectance of the Fig. 2 coated article from the point of view of the intended viewer in Table 13, and that the a* and b* values under RY stand for the respective CIE visible reflectance colorations of the overall Fig. 2 coated article including both coatings from the point of view of the intended viewer and indicate neutral reflective coloration of the overall coated article in the Fig. 2 embodiment.
• Fig. 2 embodiment has high visible transmission, low visible reflectance due to the AR coatings 10 and 20, and generally neutral appearance from the point of view of the intended viewer.
• the a* and b* color values discussed herein are reflective and are from the point of view of the intended viewer of the coated article.
• Table 14 sets forth optical data for coating 10 alone on a glass substrate (where coating 20 is not present) prior to HT according to certain example embodiments of this invention.
• Table 14 sets forth the visible transmission (TY), visible reflectance (RY), reflective a* color value, and reflective b* color value of a coated article including glass substrate 1 and coating 10, from the perspective of the intended viewer shown in Fig. 2, according to certain example embodiments of this invention.
• coatings 10 and 20 can be interchanged with each other in certain example embodiments of this invention.
• Table 14 Optical Characteristics (Coating 10 on glass; Fig. 2; pre-HT)
• Table 15 sets forth optical data for coating 10 alone on a glass substrate
• Table 15 sets forth the visible transmission (TY), visible reflectance (RY), reflective a* color value, and reflective b* color value of a coated article including glass substrate 1 and coating 10, from the perspective of the intended viewer shown in Fig. 2, according to certain example embodiments of this invention post-HT.
• Table 15 Optical Characteristics (Coating 10 on glass; Fig. 2; post-FTT)
• an a* shift from -2 to +2 would be a shift in the positive direction because the a* value becomes more positive.
• an a* shift from +1 to +3 would be a shift in the positive direction because the a* value becomes more positive.
• Table 16 sets forth optical data for coating 20 alone on a glass substrate (where coating 10 is not present) prior to HT according to certain example embodiments of this invention.
• Table 16 sets forth the visible transmission (TY), visible reflectance (RY), reflective a* color value, and reflective b* color value of a coated article including glass substrate 1 and coating 20, from the perspective of the intended viewer shown in Fig. 2, according to certain example embodiments of this invention.
• coatings 10 and 20 can be interchanged with each other in certain example embodiments of this invention.
• Table 16 Optical Characteristics (Coating 20 on glass; Fig. 2; pre-HT)
• Table 17 sets forth optical data for coating 20 alone on a glass substrate
• Table 17 sets forth the visible transmission (TY), visible reflectance (RY), reflective a* color value, and reflective b* color value of a coated article including glass substrate 1 and coating 20, from the perspective of the intended viewer shown in Fig. 2, according to certain example embodiments of this invention post-FTT.
• Table 17 Optical Characteristics (Coating 20 on glass; Fig. 2; post-FTT)
• HT of a glass substrate with coating 20 thereon causes the reflective a* color value to shift in the negative direction (opposite to the a* shift caused by coating 10) from the perspective of the intended viewer.
• an a* shift from -0.5 to -9 would be a shift in the negative direction because the a* value becomes more negative.
• an a* shift from +1 to -8 would be a shift in the negative direction because the a* value becomes more negative.
• coating 10 on glass provides a positive reflective a* color value to the viewer whereas coating 20 on glass provides a negative reflective a* color value to the viewer, so that the coatings compensate for each other so that the overall coated article from the perspective of the intended viewer has a more neutral coloration than the coloration caused by coating 10 alone or coating 20 alone on glass.
• coating 10 on glass provides a negative reflective b* color value to the viewer whereas coating 20 on glass provides a positive reflective b* color value to the viewer, so that the coatings on glass compensate for each other so that the overall coated article from the perspective of the intended viewer has a more neutral coloration than the coloration caused by coating 10 alone or coating 20 alone on glass.
• Comparative Example (CE) 2 is a glass substrate 1 with AR coatings
• Example 2 is also a glass substrate 1 with AR coatings Ex. 2a and Ex. 2b on opposite sides thereof as shown in Fig. 1.
• Layer thicknesses below are in angstroms (A).
• Example 2a is similar to coating 20 in Fig. 2
• Example 2b is similar to coating 10 in Fig. 2.
• “L” stands for layer in the table below, so that for example L2 stands for layer 2, L3 stands for layer 3, and so forth. The layers below move from the glass substrate 1 outward.
• CE2b 86 A 365 A 987 A 250 A 439 A 100 ,
• Comparative Example 2 used the same AR coating on both sides of the glass substrate 1, whereas Example 2 used different AR coatings.
• low index layer 5 in coating 10 is physically thicker than low index layer 5' in coating 20 by at least 75 A, more preferably by at least 100 A, more preferably by at least 130 A, and most preferably by at least 160 A, with an example range being from about 100-250 A thicker, or from about 120-210 A thicker). It has surprisingly and unexpectedly been found that this difference in thickness between layers 5 and 5' provides for a significant change in a* and b* values before and after HT (especially after HT in the Fig. 2 embodiment), and for a different direction of a* color shift upon HT (see optical data below).
• the example coatings had the following characteristics.
• Comparative Example 2 on the glass substrate had very negative reflective a* values from the perspective of the intended viewer, and that the HT caused the reflective a* values to shift significantly to the negative for both CE2a and CE2b.
• the change in thickness between layers 5 and 5' mentioned above in Example 2 coupled with a small change in thickness between layers 3, 3', surprisingly and unexpectedly caused the coating Ex. 2a (coating 20) on the glass substrate to have a negative reflective a* value, but the coating Ex. 2b (coating 10) on the glass substrate to have a positive reflective a* value after HT.
• the thickness change also
• Comparative Example 2 has a positive reflective b* value from the perspective of the viewer (caused by both coatings causing a positive b* reflective color) which is much further from the central origin in Fig. 3 (and thus less neutral) compared to the reflective b* value of Example 2 where the negative b* value of coating 10 (Ex. 2b) substantially compensates for the positive b* value of coating 20 (Ex. 2a) to make Example 2 appears more neutral to the viewer.
• a method of making a transparent coated glass product comprising: having a coated article comprising a first coating provided on a first side of a glass substrate and a second coating provided on a second side of the glass substrate, so that the glass substrate is located between at least the first and second coatings; and heat treating the coated article at a temperature of at least 580 degrees C so that the heat treating (i) causes the first coating on the glass substrate to realize a reflective a* color value shift in a positive direction from the perspective of an intended viewer due to the heat treating, and (ii) causes the second coating on the glass substrate to realize a reflective a* color value shift in a negative direction from the perspective of the intended viewer due to the heat treating.
• the heat treating may (i) cause the first coating on the glass substrate to realize a reflective a* color value shift in a positive direction of at least 1.0 (or at least 2,0) from the perspective of an intended viewer due to the heat treating, and (ii) cause the second coating on the glass substrate to realize a reflective a* color value shift in a negative direction of at least 1.0 (or at least 2.0) from the perspective of the intended viewer due to the heat treating.
• the first and second coatings may be antireflective (AR) coatings.
• the first coating on the glass substrate has a visible reflectance of no greater than 5% (more preferably no greater than 2%, and most preferably no greater than 1%), and the second coating on the glass substrate has a visible reflectance of no greater than 5% (more preferably no greater than 2%, and most preferably no greater than 1%).
• all layers of the first and/or second coatings may be transparent dielectric layers.
• the first coating may comprise, moving away from the glass substrate, a first transparent dielectric layer comprising an oxide of Ti and/or Nb; a first transparent dielectric layer comprising silicon oxide; a second transparent dielectric layer comprising an oxide of Ti and/or Nb; and a second transparent dielectric layer comprising silicon oxide; and the second coating may comprise, moving away from the glass substrate, a first transparent dielectric layer comprising an oxide of Ti and/or Nb; a first transparent dielectric layer comprising silicon oxide; a second transparent dielectric layer comprising an oxide of Ti and/or Nb; and a second transparent dielectric layer comprising silicon oxide.
• the second transparent dielectric layer comprising silicon oxide of the first coating may be thicker than the second transparent dielectric layer comprising silicon oxide of the second coating by at least 75 A, more preferably by at least 100 A, and most preferably by at least 130 A.
• the heat treating may comprise thermal tempering, heat bending, and/or heat strengthening.
• a coated article including a first coating and a second coating supported by a glass substrate, the coated article comprising: the first coating provided on a first side of the glass substrate; the second coating provided on a second side of the glass substrate, so that the glass substrate is located between at least the first and second coatings; wherein, from the perspective of a viewer of the coated article, the first coating on the glass substrate has a positive a* reflective color, and the second coating on the glass substrate has a negative a* reflective color.
• the first coating on the glass substrate may have a negative b* reflective color
• the second coating on the glass substrate may have a positive b* reflective color
• the first and second coatings may be antireflective (AR) coatings.
• the first coating on the glass substrate may have a visible reflectance of no greater than 15% (more preferably no greater than 5%, even more preferably no greater than 2%), and/or the second coating on the glass substrate may have a visible reflectance of no greater than 15% (more preferably no greater than 5%, even more preferably no greater than 2%).
• neither the first coating nor the second coating contains a silver based infrared (IR) reflective layer.
• the coated article may have a visible transmission of at least 60%, more preferably at least 70%, more preferably at least 80%, even more preferably at least 90%, and possibly at least 95%.
• all layers of the first coating and/or the second coating may be transparent dielectric layers.
• the coated article may be heat treated (e.g., thermally tempered, heat strengthened, and/or heat bent).
• the first coating on the glass substrate may be configured to provide a reflective a* color value shift in a positive direction from the perspective of the viewer due to the heat treatment
• the second coating on the glass substrate may be configured to provide a reflective a* color value shift in a negative direction from the perspective of the viewer due to the heat treatment.
• the first coating on the glass substrate may be configured to provide a reflective b* color value shift in a negative direction from the perspective of the viewer due to the heat treatment
• the second coating on the glass substrate may be configured to provide a reflective b* color value shift in a positive direction from the perspective of the viewer due to the heat treatment
• the first coating may be provided on the same side of the glass substrate from which the viewer is intended to view the coated article.
• the coated article including the first and second coatings on the glass substrate, may have a visible transmission of at least 70%, a reflective a* value of from -5 to +5, and/or a reflective b* value of from -6 to +6.
• the coated article including the first and second coatings on the glass substrate, may have a visible transmission of at least 70%, a reflective a* value of from -3 to +3, and/or a reflective b* value of from -4 to +4.
• the first coating may comprise, moving away from the glass substrate, a first high index transparent dielectric layer having a refractive index (n) of at least 2.15; a first low index transparent dielectric layer having a refractive index of no greater than 1.8; a second high index transparent dielectric layer having a refractive index (n) of at least 2.15; and a second low index transparent dielectric layer having a refractive index of no greater than 1.8; and the second coating may comprise, moving away from the glass substrate, a first high index transparent dielectric layer having a refractive index (n) of at least 2.15; a first low index transparent dielectric layer having a refractive index of no greater than 1.8; a second high index transparent dielectric layer having a refractive index (n) of at least 2.15; and a second low index transparent dielectric layer having a refractive index of no greater than 1.8.
• the low index layers of the first and/or second coatings may comprise silicon oxide (e.g., S1O2).
• the high index layers of the first and/or second coatings may comprise an oxide of titanium and/or niobium.
• the second low index layer of the first coating may be thicker than the second low index layer of the second coating by at least 75 A, more preferably by at least 100 A, even more preferably by at least 130 A, and in certain preferred instances by at least 160 A.
• the second low index layer of the first coating may be thicker than the second low index layer of the second coating by from about 100-250 A.
• first and/or second coating may further comprise a medium index transparent dielectric layer having a refractive index (n) of from 1.70 to 2.10 located between the second high index layer and the second low index layer, and the medium index layer may comprise oxide of Nb and Si.
• the first and/or second coating may further comprise a medium index transparent dielectric layer having a refractive index (n) of from 1.70 to 2.10 located over the second low index layer, where this medium index layer may comprise oxide of Zr and Si.
• the first coating may comprise, moving away from the glass substrate, a first transparent dielectric layer comprising an oxide of Ti and/or Nb; a first transparent dielectric layer comprising silicon oxide; a second transparent dielectric layer comprising an oxide of Ti and/or Nb; and/or a second transparent dielectric layer comprising silicon oxide; and wherein second coating may comprise, moving away from the glass substrate, a first transparent dielectric layer comprising an oxide of Ti and/or Nb; a first transparent dielectric layer comprising silicon oxide; a second transparent dielectric layer comprising an oxide of Ti and/or Nb; and/or a second transparent dielectric layer comprising silicon oxide.
• the second transparent dielectric layer comprising silicon oxide of the first coating may be thicker than the second transparent dielectric layer comprising silicon oxide of the second coating by at least 75 A, more preferably by at least 100 A, still more preferably by at least 130 A.
• the second transparent dielectric layer comprising silicon oxide of the first coating may be thicker than the second transparent dielectric layer comprising silicon oxide of the second coating by from about 100-250 A.
• the first and/or second coating may further comprise a layer comprising oxide of Nb and Si between the second transparent dielectric layer comprising an oxide of Ti and/or Nb and the second transparent dielectric layer comprising silicon oxide.
• the first and/or second coating may further comprise a layer comprising oxide of Zr and Si located over the second transparent dielectric layer comprising silicon oxide.

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