EA045707B1 - WINDSHIELD INDICATOR SYSTEM - Google Patents

Description

Field of technology to which the invention relates

The invention relates to a windshield display panel system and a method for providing said windshield display panel system.

Prerequisites for creating the invention

Head up display systems, or HUD (head up display) systems, are widely used in transportation devices to provide information on the glazing of vehicles in the field of view of the viewer or driver of said vehicle device.

There are a wide variety of HUD systems known. Typically, a projection system is combined with a translucent mirror (a translucent reflector and a translucent window) as the final optical component to form the projected image that the user sees. At the same time, the user can see other surrounding views through the translucent mirror. The translucent mirror is an important component that affects the usability of the indicator panel. In general, the reflectivity of a translucent mirror must be sufficient to reflect light from the projector, but the translucent mirror must also be clear enough to provide adequate visibility through it.

Examples of a HUD system are provided in CN104267498A for a windshield display system comprising a projection light source, a laminated glass and a transparent nanometer film, wherein the transparent nanometer film comprises at least one multi-layer structure of high reflectance layers/low reflectance layers reflections that are successively superimposed in an outward direction from the surface of the inner glass panel; a projection light source is used to generate p-polarized light, the p-polarized light enters the transparent nanometer film, the reflectivity of the p-polarized light from the transparent nanometer film is not less than 5%, and the incidence angle of the p-polarized light is in the range of 42 degrees to 72 degrees. Other examples of HUD systems are provided in CN206147178U and CN204166197U.

Another example of a HUD is presented in EP3187917A2 for a HUD system comprising a projection light source and a laminated glazing panel, the laminated glazing comprising an inner glass panel, an outer glass panel, and an interlayer film disposed between the inner glass panel and an outer glass panel, wherein the display panel system on the windshield further comprises a transparent nanofilm containing at least two dielectric layers and at least one metal layer, where each metal layer is located between two dielectric layers; the difference between the refractive index of the intermediate film and the refractive index of the inner glass panel and the outer glass panel is not more than 0.1; and a projection light source is used to generate p-polarized light that is incident on the surface of the inner glass panel away from the intermediate film, the light having an incidence angle of 42 to 72 degrees so that the transparent nanofilm can reflect part of the incident p-polarized light.

WO2019/046157A1 discloses a multilayer material comprising: a first layer having a first surface and a second surface, where the first surface is an outer surface of the multilayer material; a second layer having a third surface facing the second surface and a fourth surface opposite the third surface, where the fourth surface is an inner surface of the laminate; intermediate layer between layers; and an improved p-polarized light reflective coating disposed on at least a portion of the surface of the layers. When the laminate is contacted with radiation containing p-polarized radiation at an angle of 60 relative to the normal of the laminate, the laminate exhibits an LTA of at least 70% and a p-polarized reflectance of at least 10%. An indicator panel system and a method for projecting an image on an indicator panel on a windshield are also disclosed.

Typical disadvantages associated with HUD systems are ghosting or ghosting. Also disadvantageous is the reflection of elements around the glazing of the vehicle on which the projected information is provided, and this reflection blurs and weakens said projected information.

There remains a need for reflective coatings for p-polarized light that can withstand heat treatments and remain useful for reflecting clear and crisp images on glazing in a HUD system.

The essence of the invention

The present invention provides a HUD system comprising:

a. a light source that projects light towards the glazing,

b. said glazing comprising an outer sheet of glass having a first surface and a second surface, and an inner sheet of glass having a first surface and a second surface, wherein the second surface of the inner sheet of glass comprises a first coating, both sheets being bonded by at least one sheet of interlayer material, providing contact between the first

- 1 045707 surface of the inner sheet of glass (S3) and a second surface of the outer sheet of glass (S2), characterized in that said first coating contains:

at least one high refractive index layer having a thickness of from 50 to 100 nm, and

at least one low refractive index layer having a thickness of from 70 to 160 nm, wherein at least one high refractive index layer contains at least one of:

Zr, Nb, Sn oxide;

mixed oxide Ti, Zr, Nb, Si, Sb, Sn, Zn, In;

Si, Zr nitride;

mixed nitride Si, Zr.

A method for providing such a HUD system is also provided.

Detailed Description of the Invention

The present invention provides a HUD system comprising:

A. a light source that projects light towards the glazing,

b. said glazing comprising an outer sheet of glass having a first surface and a second surface, and an inner sheet of glass having a first surface and a second surface, wherein the second surface of the inner sheet of glass comprises a first coating, both sheets being bonded by at least one sheet of interlayer material, providing contact between the first surface of the inner sheet of glass and the second surface of the outer sheet of glass, characterized in that said first coating comprises:

at least one high refractive index layer having a thickness of from 50 to 100 nm, and at least one low refractive index layer having a thickness of from 70 to 160 nm, wherein the at least one high refractive index layer contains at least at least one of:

Zr, Nb, Sn oxide;

mixed oxide Ti, Zr, Nb, Si, Sb, Sn, Zn, In;

Si, Zr nitride;

mixed nitride Si, Zr.

The light source typically provides light projection towards the glazing. The light source may contain a polarizer. The light incident on the polarizer may include all or part of the visible range of the electromagnetic spectrum. It can also include infrared wavelengths. The reflective polarizer can be designed so that both s- and p-polarized light, at an incidence close to normal and at oblique angles, is strongly reflected in the infrared region, in which case, for example, additional deflection of solar radiation can be achieved. Such light sources are generally known in the art and will not be described herein.

In the context of the present invention, the light source provides p-polarized light. This light allows for preferential reflection of the projected information towards the glazing.

Typically, projected light hits the glazing at an angle of 42 to 72 degrees. An advantage of a true HUD system equipped with a p-polarized light source is that little or no ghosting is created by the outer glass surface (S1) if the light incidence angle is close to Brewster's angle, typically approximately 56°, resulting in effective reflection p-polarized light capabilities of the first coating described herein. An additional advantage of a true HUD system is the ability to project and reflect various colors with good detail.

The glazing comprises an outer sheet of glass having a first surface (S1) and a second surface (S2), and an inner sheet of glass having a first surface (S3) and a second surface (S4). Such glazing is usually multilayer. The outer sheet of glazing glass is that sheet which is in contact with the external environment of the vehicle or building. The inner sheet of glass is that sheet which is in contact with the interior of a vehicle or building. The two sheets of glass are held in contact with an overlay sheet, or interlayer, which serves to provide adhesion and contact between the two sheets of glass. The intermediate layer provides contact between the first surface of the inner glass sheet (S3) and the second surface of the outer glass sheet (S2).

The glass may be soda-lime silicate glass, aluminosilicate glass, or borosilicate type glass, or the like. Generally, the glass sheet is float glass, having a thick

- 2 045707 thickness from 0.5 to 12 mm. In transportation-related applications, glass may have thicknesses ranging from 1 to 8 mm, although it may be thinner or thicker in construction-related applications, such as ultra-thin glass from 0.5 to 1 mm, or thicker glass from 8 to 12 mm, in addition to a thickness of 1 to 8 mm.

The composition of the glazing is not particularly important for the purpose of the present invention, provided that said sheet of glass is suitable for applications related to transportation or construction. The glass may be clear glass, ultra clear glass or colored glass containing one or more components/colorants in the appropriate amount depending on the desired effect. Colored glass includes grey, green or blue float glass. In some circumstances, colored glass may be advantageous in providing the proper and desired color of the completed glazing.

A particularly suitable colored glass may be green glass as it provides a superior appearance when viewed from the outside of the vehicle. The green glass may, for example, be soda-lime glass with iron oxide in the form of Fe ₂ O ₃ in amounts ranging from 0.3 to 1.0 wt%.

The sheet of glass may be flat or fully or partially curved to properly fit a particular glass support design, depending on the shape required by the application.

The intermediate layer typically contains thermoplastic materials such as polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), polyurethane (PU), polyethylene terephthalate (PET), polycarbonate or several layers thereof, typically with a total thickness of 0.3 to 0.9 mm. The intermediate layer may contain dyes and therefore be a colored intermediate layer.

In some cases where the glass is not colored glass, the interlayer may be a colored interlayer. Again, such a colored interlayer can provide a superior appearance to an outside observer.

The intermediate layer typically has a uniform thickness over its entire surface between the two sheets of glass. The intermediate layer is therefore generally not considered to be a wedge-shaped intermediate layer. The wedge-shaped intermediate layer may cause artifacts in the reflected image and is therefore not essential within the scope of the present invention. In addition, such a wedge-shaped intermediate layer typically involves additional design and manufacturing costs.

Within the scope of the present invention, the intermediate layer generally does not contain light absorbing material or any polymers that cause light interference. In the context of the present invention, the intermediate layer generally does not support the multilayer coating.

The second surface of the inner glass sheet (S4) contains the first coating. The first coating contains at least one layer of high refractive index material and at least one layer of low refractive index material. For the purposes of the present invention, such a sequence will be referred to as a high/low sequence.

In some embodiments, the first coating may comprise alternating high and low refractive index layers, that is, the first coating may comprise more than one layer of high refractive index material and/or more than one layer of low refractive index material. In such cases, the high/low sequence may occur more than once, that is, the sequence may be repeated at least 2 times. The sequence may be repeated up to 3 or 4 or more times. In some cases, a repeating sequence will occur no more than 3 times.

In the context of the present invention, at least the inner sheet provided with the first coating is useful in order to withstand the thermal hardening process. Such an inner sheet can therefore be subjected to a thermal hardening process.

In the context of the present invention, the high refractive index is typically >1.8, alternatively >1.9, alternatively >2.0, alternatively >2.1, at a wavelength of 550 nm.

In the context of the present invention, the low refractive index is typically <1.8, alternatively <1.7, alternatively <1.6, at a wavelength of 550 nm.

Within the scope of the present invention, at least one high refractive index layer of the first coating contains at least one of: Zr, Nb, Sn oxide;

mixed oxide Ti, Zr, Nb, Si, Sb, Sn, Zn, In;

Si, Zr nitride;

mixed nitride Si, Zr.

In some embodiments of the present invention, at least one high refractive index layer of the first coating comprises at least one of titanium zirconium mixed oxide, titanium silicon mixed oxide, niobium zirconium mixed oxide, silicon zirconium mixed nitride, aluminum doped nitride silicon, zirconium oxide, indium tin mixed oxide, zinc aluminum mixed oxide, mixed

- 3 045707 antimony and tin oxide, mixed titanium and zinc oxide, mixed zinc and tin oxide.

In a particular selection of thickness ranges, such high refractive index materials are chosen because they do not undergo much change in crystal structure when thermally hardened. Therefore, from this point of view, titanium oxide is not recommended as a high refractive index material when there is only one high refractive index layer of the first coating, since it undergoes a large change in crystal structure when thermally hardened.

In some alternative embodiments of the present invention, at least one high refractive index layer of the first coating comprises at least one of titanium-zirconium mixed oxide, titanium-silicon mixed oxide, niobium-zirconium mixed oxide, aluminum-doped silicon-zirconium mixed nitride silicon nitride, zirconium oxide, mixed zinc and tin oxide.

These materials do not compromise the quality of the high refractive index layer under thermal cycles within the stated thickness ranges.

Preferred high refractive index materials for maximizing the reflection of polarized light include, in descending order of preference, titanium zirconium mixed oxide, silicon zirconium mixed nitride, titanium silicon mixed oxide, aluminum doped silicon nitride, and zinc tin mixed oxide.

The preferred material for the high index layer is titanium-zirconium mixed oxide, Ti/Zr ratio from 55/45 to 75/25 wt.%, preferably 65/35 wt.%, optionally with titanium-silicon mixed oxide in Ti/Si ratio from 85/15 to 95/5 wt.%, preferably 92/8 wt.%.

Examples of the low refractive index material include silicon oxide, silicon oxynitride, silicon oxycarbide, optionally doped with, for example, aluminum, or mixtures such as silicon-aluminum mixed oxide, silicon-zirconium mixed oxide.

The preferred material for the low index layer is silica, optionally doped with aluminum, or a mixed oxide of silicon and aluminum.

The first coating may thus comprise a first layer of high refractive index material in contact with the glass and a first layer of low refractive index material above the first layer of high refractive index material. In such embodiments, the thickness of the first layer of high refractive index material, optionally made of one or more sublayers, may be in the range of 50 to 100 nm, alternatively 60 to 80 nm. In such embodiments, the thickness of the first layer of low refractive index material, optionally made of one or more sublayers, may independently range from 70 to 160 nm, alternatively from 80 to 120 nm.

These stated thickness ranges allow the first coating to have optimal p-polarized light reflectance such that it can be >8%, alternatively >9%, together with optimal total reflectance suppression remaining <21%, and yet the coating can withstand heat treatments.

The thickness of the first layer of high refractive index material < 50 nm does not provide optimal reflection of p-polarized light. The thickness of the first layer of material with a low refractive index < 70 nm does not provide the possibility of optimal reflection of polarized light. The thickness of the first layer of low refractive index material > 160 nm does not provide optimal suppression of total reflectance.

The choice of thickness ranges as presented herein for the first layer of high refractive index material and for the first layer of low refractive index material, combined with the selection of high refractive index materials, provides the ability to obtain an optimal reflective coating for p-polarized light that at the same time it does not have a high overall reflectivity, so that reflection from the dashboard does not cause irritation. The aesthetic appearance in reflection when viewed from the outside is also guaranteed.

In some embodiments of the present invention, the first coating consists of a first layer of high refractive index material in contact with the glass and a first layer of low refractive index material above and in contact with the first layer of high refractive index material. In such embodiments, the thickness of the first layer of high refractive index material, optionally made of one or more sublayers, may be in the range of 50 to 100 nm, alternatively 60 to 80 nm. In such embodiments, the thickness of the first layer of low refractive index material, optionally made of one or more sublayers, may independently range from 70 to 160 nm, alternatively from 80 to 120 nm.

In some embodiments of the present invention, when a repeating sequence

- 4 045707 high/low performance occurs twice, the first coating contains a first layer of high refractive index material in contact with the glass and a first layer of low refractive index material above the first layer of high refractive index material, as well as a second layer of high refractive index material refraction over a first layer of low refractive index material and a second layer of low refractive index material over a second layer of high refractive index material.

In such embodiments with 2 high/low repeat sequences, the first cover may comprise:

a. a first layer of high refractive index material having a thickness of from 1 to 15 nm in contact with the glass, alternatively from 2 to 11 nm, and

b. a first layer of low refractive index material having a thickness of 150 to 220 nm, above a first layer of high refractive index material, alternatively 152 to 210 nm, alternatively 157.7 to 210 nm, and

c. a second layer of high refractive index material having a thickness of from 50 to 100 nm, above the first layer of low refractive index material, alternatively from 50 to 90 nm, alternatively from 55 to 75 nm, and

d. a second layer of low refractive index material having a thickness of from 70 to 160 nm, above a second layer of high refractive index material, alternatively from 95 to 115 nm.

These thickness ranges, in combination with each other for high refractive index layers and low refractive index layers, especially in the presented ranges, ensure that the first coating has an optimal reflection of p-polarized light, so that it can be >8%, alternatively >9%, with optimal total reflectance suppression remaining <21%, while still being able to withstand heat treatments.

Selecting thickness ranges for each layer provides specific performance characteristics in terms of reflection of p-polarized light. Such performance, for example, cannot be obtained when the first layer of low refractive index material has a thickness of <150 nm, or <152 nm, or <157.7 nm.

In specific embodiments with 2 high/low repeat sequences, the first coating comprises:

a. a first layer of high refractive index material having a thickness of from 1 to 15 nm in contact with the glass, alternatively from 2 to 11 nm, and

b. a first layer of low refractive index material having a thickness of from 150 to 220 nm, above and in contact with the first layer of high refractive index material, alternatively from 152 to 210 nm, alternatively from 157.7 to 210 nm, and

c. a second layer of high refractive index material having a thickness of from 50 to 100 nm, above and in contact with the first layer of low refractive index material, alternatively from 50 to 90 nm, alternatively from 55 to 75 nm, and

d. a second layer of low refractive index material having a thickness of from 70 to 160 nm, above and in contact with the second layer of high refractive index material, alternatively from 95 to 115 nm.

When the repeating high/low sequence occurs three times, the first coating comprises a first layer of high refractive index material in contact with the glass, and a first layer of low refractive index material above the first layer of high refractive index material, and a second layer of high refractive index material. over a first layer of low refractive index material, and a second layer of low refractive index material over a second layer of high refractive index material, and a third layer of high refractive index material over a second layer of low refractive index material, and a third layer of low refractive index material refraction over a third layer of high refractive index material.

In such embodiments with 3 high/low repeat sequences, the first cover may comprise:

a. a first layer of high refractive index material having a thickness of from 1 to 15 nm in contact with the glass, alternatively from 4 to 10 nm, and

b. a first layer of low refractive index material having a thickness of from 100 to 160 nm, above a first layer of high refractive index material, alternatively from 120 to 140 nm, and

c. a second layer of high refractive index material having a thickness of from 1 to 20 nm, above the first layer of low refractive index material, alternatively from 2 to 8 nm, and

d. a second layer of low refractive index material having a thickness of from 20 to 60 nm, above a second layer of high refractive index material, alternatively from 40 to 50 nm, and

e. a third layer of high refractive index material having a thickness of from 40 to 100 nm, above a second layer of low refractive index material, alternatively from 45 to 90 nm, and

- 5 045707

f. a third layer of low refractive index material having a thickness of from 80 to 140 nm, above a third layer of high refractive index material, alternatively from 90 to 130 nm.

These thickness ranges enable optimal reflection of p-polarized light together with optimal suppression of total reflectance for the inventive first coating that can withstand heat treatments.

In other embodiments with 3 high/low repeat sequences, the first cover comprises:

a. a first layer of high refractive index material having a thickness of from 1 to 15 nm in contact with the glass, alternatively from 4 to 10 nm, and

b. a first layer of low refractive index material having a thickness of from 100 to 160 nm, above and in contact with the first layer of high refractive index material, alternatively from 120 to 140 nm, and

c. a second layer of high refractive index material having a thickness of from 1 to 20 nm, above and in contact with the first layer of low refractive index material, alternatively from 2 to 8 nm, and

d. a second layer of low refractive index material having a thickness of from 20 to 60 nm, above and in contact with the second layer of high refractive index material, alternatively from 40 to 50 nm, and

e. a third layer of high refractive index material having a thickness of from 40 to 100 nm, above and in contact with a second layer of low refractive index material, alternatively from 45 to 90 nm, and

f. a third layer of low refractive index material having a thickness of from 80 to 140 nm, above and in contact with a third layer of high refractive index material, alternatively from 90 to 130 nm.

In these cases of more than 1 repeating high/low sequence, at least one of the high refractive index layers of the first coating contains at least one of:

Zr, Nb, Sn oxide;

mixed oxide Ti, Zr, Nb, Si, Sb, Sn, Zn, In;

Si, Zr nitride;

mixed nitride Si, Zr.

When there is more than one high index layer in the first coating, that is, when there is more than 1 high/low sequence in the first coating, the at least one high index layer may comprise at least one of:

Zr, Nb, Sn oxide;

mixed oxide Ti, Zr, Nb, Si, Sb, Sn, Zn, In;

Si, Zr nitride;

mixed Si, Zr nitride, whereas the second or more high refractive index layers may independently comprise at least one of:

oxide Zr, Nb, Sn, Ti, Bi, Ga, Gd, Hf, Mg, W, Y, optionally alloyed with Al, B, F, In, Si, Sb, Sn;

mixed oxide Ti, Zr, Nb, Si, Sb, Sn, Zn, In, B;

Si, Zr nitride;

mixed nitride Si, Zr.

Other examples of high refractive index materials for the second or more high refractive index layers may thus comprise titanium oxide, bismuth oxide, gallium oxide, gadolinium oxide, hafnium oxide, magnesium oxide, tungsten oxide, yttria, optionally doped, or mixtures thereof, mixed oxides of zirconium and boron, mixed oxides of zinc and aluminum. Titanium oxide may be used in the second or more high refractive index layers, provided that the first high refractive index layer is not titanium oxide. From this point of view, when there is more than one high refractive index layer in the first coating, titanium oxide is therefore not recommended as a high refractive index material of the first high refractive index layer because it undergoes a change in crystal structure when quenched.

Preferred high refractive index materials for maximizing the reflection of polarized light include, in descending order of preference, titanium zirconium mixed oxide, silicon zirconium mixed nitride, titanium silicon mixed oxide, aluminum doped silicon nitride, and zinc tin mixed oxide.

When selecting thickness ranges, these high refractive index materials are chosen because they do not undergo much change in crystal structure when thermally hardened. Therefore, from this point of view, titanium oxide is not recommended for all layers with a high refractive index, since it undergoes large changes in the crystal structure under heat

- 6 045707 chesk hardening.

In some embodiments, when there is more than one high index layer in the first coating, that is, when there is more than 1 high/low sequence in the first coating, each high index layer may independently comprise at least one of:

Zr, Nb, Sn oxide;

mixed oxide Ti, Zr, Nb, Si, Sb, Sn, Zn, In;

Si, Zr nitride;

mixed nitride Si, Zr.

In some cases, the preferred materials for the material of at least one of the high index layers is a mixed titanium-zirconium oxide, in a Ti/Zr ratio of 55/45 to 75/25 wt.%, preferably in a 65/35 wt.% ratio, while the material of at least one other of the high index layers may be a mixed titanium-silicon oxide, in a Ti/Si ratio of 85/15 to 95/5 wt.%, preferably in a 92/8 wt.% ratio. Together they can provide, within the stated thickness ranges and in combination with selected low refractive index layers, a first coating with optimal p-polarized light reflection such that it can be >8%, alternatively >9%, together with optimal total reflectance suppression ability remaining <21%, while the coating can withstand heat treatments.

In other cases, the preferred material for the material of all high index layers is a mixed titanium-zirconium oxide, Ti/Zr ratio from 55/45 to 75/25 wt.%, preferably 65/35 wt.%. This can contribute, in the stated thickness ranges and in combination with selected low refractive index layers, to obtain a first coating with optimal reflection of p-polarized light, such that it can be >9%, alternatively >10%, together with optimal suppression of total reflectance ability remaining <21%, while the coating can withstand heat treatments.

The preferred material for all low refractive index layers is silicon oxide, optionally doped with aluminum, or mixed silicon-aluminum oxide.

In all embodiments, the thicknesses of the different layers can be independently varied within the presented limits to control the technical effect provided by the present invention.

In the context of the present invention, a second coating comprising n IR reflective functional layer layers and n+1 dielectric layers, where each IR reflective functional layer layer is disposed between two dielectric layers, may optionally be provided on at least one of the first surface of the inner glass sheet (S3) or the second surface of the outer glass sheet (S2).

This second coating is compatible with all previous embodiments described above. This second coating does not interfere with the functions of the first coating, that is, the first coating still provides the reflection of p-polarized light used to reflect a clear and crisp image on the glazing in the HUD system.

In some cases, where at least one of the inner or outer sheet is an ultra-thin sheet of clear glass having a thickness of 0.5 to 1 mm, the presence of a second coating further reduces the overall solar transmittance.

As used herein, the terms below, below, under indicate the relative position of a layer relative to the next layer within a sequence of layers starting from the substrate. As used herein, the terms over, over, over, and on indicate the relative position of a layer relative to the next layer within a sequence of layers starting from the substrate.

Within the scope of the present invention, the relative positions of the layers within the optional second coating do not necessarily imply direct contact. That is, some intermediate layer may be provided between the first and second layer. In some cases, a layer may actually consist of several separate layers (or sublayers).

In some cases the relative position may involve direct contact and this will be indicated.

In most cases, the optional second coating does not contain a nitride-containing layer in contact with the glass surface.

The functional layer reflecting IR radiation can be made of silver, gold, palladium, platinum or their alloys. The functional layer may have a thickness of from 2 nm to 22 nm, alternatively from 5 nm to 20 nm, alternatively from 8 nm to 18 nm. The range of functional layer thickness will influence the conductivity, emissivity, solar control and light transmittance of the second coating.

The dielectric layers may typically contain oxides, nitrides, oxynitrides or oxycar

- 7 045707 bids Zn, Sn, Ti, Zr, In, Al, Bi, Ta, Mg, Nb, Y, Ga, Sb, Mg, Si and their mixtures. These materials may optionally be alloyed, where examples of alloying additives include aluminum, zirconium, or mixtures thereof. The alloying additive or mixture of alloying additives may be present in amounts up to 15% by weight. Typical examples of dielectric materials include, but are not limited to, silicon-based oxides, silicon-based nitrides, zinc oxides, tin oxides, zinc-tin mixed 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 of them, such as, for example, titanium-zirconium oxide.

The coating may comprise a seed layer at the bottom of the at least one functional layer, and/or the coating may comprise a barrier layer on the at least one functional layer. This functional layer may be provided with either a seed layer or a barrier layer, or both of these layers. The first functional layer may be provided with any one or both of the seed and barrier layers, and the second functional layer may be provided with any one or both of the seed and barrier layers, etc. These structures are not mutually exclusive. The seed and/or barrier layer may have a thickness of from 0.1 nm to 35 nm, alternatively from 0.5 nm to 25 nm, alternatively from 0.5 nm to 15 nm, alternatively from 0.5 nm to 10 nm.

The coating may also comprise a thin layer of sacrificial material having a thickness of <15 nm, alternatively <9 nm, provided above and in contact with the at least one functional layer, and which may be selected from the group consisting of titanium, zinc, nickel, chromium and mixtures thereof.

The coating may optionally comprise a surface coating or top layer, as a final layer, to protect the underlying package from damage. Such a surface coating contains oxides of Ti, Zr, Si, Al or mixtures thereof; Si, Al nitrides or mixtures thereof; layers based on carbon (such as graphite or diamond-like carbon).

Examples of optional second coating include coatings containing:

* an infrared (IR) radiation reflecting layer in contact and located between the first and second layers, said second layer containing NiCrOx; and * wherein at least said second layer containing NiCrOx has such an oxidation state that the first part of said second layer near said infrared (IR) reflective layer is less oxidized than the second part of said second layer located further from said reflective layer infrared (IR) radiation of the layer.

Examples of the optional second coating also include coatings comprising: a dielectric layer; a first layer containing zinc oxide located on top of the dielectric layer; an infrared (IR) reflective layer containing silver located on top of and in contact with the first layer containing zinc oxide; a layer containing NiCr oxide located on top of the IR radiation reflecting layer and in contact with it; a second layer containing zinc oxide located on top of and in contact with the layer containing NiCr oxide; and another dielectric layer located on top of the second layer containing zinc oxide;

or coatings comprising: a first dielectric layer; a first infrared (IR) reflective layer containing silver disposed on top of at least the first dielectric layer; a first layer comprising zinc oxide located on top of at least a first IR reflective layer and a first dielectric layer; a second IR reflective layer containing silver located on top of and in contact with the first layer containing zinc oxide; a layer containing NiCr oxide located on top of and in contact with the second IR reflective layer; a second layer containing zinc oxide located on top of the layer containing NiCr oxide and in contact with it; and another dielectric layer located on top of at least a second layer containing zinc oxide.

Additional suitable examples of an optional second coating include a sun control coating comprising:

a main dielectric layer comprising at least a main dielectric bottom layer and a main dielectric top layer having a composition that is different from the composition of the main dielectric bottom layer, wherein the main dielectric top layer comprises any one of zinc oxide or mixed Zn oxide and at least one additional material X, wherein the X/Zn ratio in the main dielectric top layer is from 0.02 to 0.5 by weight and wherein X is one or more materials selected from the group consisting of Sn, Al, Ga, In , Zr, Sb, Bi, Mg, Nb, Ta and Ti, a first infrared reflective layer such as silver, gold, platinum or mixtures thereof, a first barrier layer, a central dielectric layer comprising at least a central dielectric bottom layer and a central a dielectric top layer having a composition that is different from the composition of the central dielectric bottom layer, wherein the central dielectric bottom layer is in direct contact with the first barrier layer and the central dielectric

- 8 045707 skim top layer; the central dielectric top layer comprises any one of zinc oxide or a mixed Zn oxide and at least one additional material Y, in which the Y/Zn ratio in the main dielectric top layer is from 0.02 to 0.5 by weight and in which Y is being one or more materials selected from the group consisting of Sn, Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti, a second infrared reflective layer such as silver, gold, platinum or mixtures thereof, second barrier layer, top dielectric layer.

Another further example of a suitable optional second coating includes a sun control coating comprising:

a main dielectric layer comprising at least a main dielectric bottom layer and a main dielectric top layer having a composition that is different from the composition of the main dielectric bottom layer, wherein the main dielectric top layer comprises any one of zinc oxide or mixed Zn oxide and at least one additional material X, wherein the X/Zn ratio in the main dielectric top layer is from 0.02 to 0.5 by weight and wherein X is one or more materials selected from the group consisting of Sn, Al, Ga, In , Zr, Sb, Bi, Mg, Nb, Ta and Ti, a first infrared reflective layer such as silver, gold, platinum or mixtures thereof, a first barrier layer, a second dielectric layer comprising at least a second dielectric bottom layer and a second a dielectric top layer having a composition that is different from the composition of the second dielectric bottom layer, wherein the second dielectric bottom layer is in direct contact with the first barrier layer and the second dielectric top layer; the second dielectric top layer comprises any one of zinc oxide or mixed oxide Zn and at least one additional material Y, in which the Y/Zn ratio in the second dielectric top layer is from 0.02 to 0.5 by weight and in which Y is being one or more materials selected from the group consisting of Sn, Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti, a second infrared reflective layer such as silver, gold, platinum or mixtures thereof, a second barrier layer, a third dielectric layer comprising at least a third dielectric bottom layer and a third dielectric top layer having a composition that is different from the composition of the third dielectric bottom layer, wherein the third dielectric bottom layer is in direct contact with the second barrier layer and the third dielectric top layer; the third dielectric top layer comprises any one of zinc oxide and Zn mixed oxide and at least one additional material Y, in which the Y/Zn weight ratio in the third dielectric top layer is from 0.02 to 0.5, and in which Y is being one or more materials selected from the group consisting of Sn, Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti, a third infrared reflective layer such as silver, gold, platinum or mixtures thereof, third barrier layer, top dielectric layer.

In such packages, the main dielectric top layer may be in direct contact with the first infrared reflective layer. The central dielectric top layer may be in direct contact with the second infrared reflective layer. The top layers of both the main dielectric layer and the central, first and second dielectric layers may independently have a geometric thickness within the range of approximately 3 to 20 nm. One or both of the additional materials X and Y may be Sn and/or Al. The proportion of Zn in the mixed oxide forming the main dielectric top layer and/or the central dielectric top layer may be such that the X/Zn and/or Y/Zn ratio is from about 0.03 to 0.3 by weight. The first and/or second and/or third barrier layer may be a layer containing Ti and/or Ti oxide, each of which may independently have a geometric thickness of from 0.5 to 7 nm. The main dielectric top layer, and/or the central, and/or the second and/or third dielectric top layer may independently have a geometric thickness of <20 nm, alternatively <15 nm, alternatively <13 nm, alternatively <11 nm and >3 nm, alternatively > 5 nm, alternatively > 10 nm. Each of the infrared reflective layers may independently have a thickness of 2 to 22 nm, alternatively 5 to 20 nm, alternatively 8 to 18 nm. The top dielectric layer may comprise at least one layer comprising a mixed oxide of Zn and at least one additional material W, in which the W/Zn ratio in the layer is from 0.02 to 2.0 by weight and in which W is one or more materials

- 9 045707 selected from the group consisting of Sn, Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti.

A specific example of such a solar control coating is presented in the table below, in which ZnSnOx is a mixed oxide containing Zn and Sn deposited by reactive sputtering of a target that is an alloy or mixture of Zn and Sn, in the presence of oxygen. Alternatively, the mixed oxide layer can be formed by sputtering a target comprising a mixture of zinc oxide and an oxide of an additional material, particularly in argon gas or an argon-enriched oxygen-containing atmosphere.

Ti barriers are deposited by sputtering a Ti target that is exposed to a pure argon or argon-enriched oxygen-containing atmosphere to deposit a barrier that is not fully oxidized. The oxidation state in each of the main, central and top dielectric layers of ZnSnOx is not necessarily the same. Likewise, the oxidation state in each of the Ti barriers is not necessarily the same. Each overlying barrier protects the underlying silver layer from oxidation during sputter deposition of the underlying ZnSnOx oxide layer. And while further oxidation may occur during the deposition of oxide layers overlying the barrier layers, a portion of these barriers may remain in metallic form or in oxide form that is not fully oxidized to provide a barrier to and during subsequent heat treatment of the glazing panel .

Table 1

(weight ratio Sn/Zn) Geometric thickness Glass substrate 2 mm Main dielectric layer containing: bottom ZnSnOx layer (0.7) top ZnSnOx layer (0.17) 20 nm 10 nm Ag 10 nm overlying Ti barrier 4 nm Central dielectric layer containing central bottom ZnSnOx layer (0.7) top ZnSnOx layer (0.17) 65 nm 10 nm Ag 10 nm overlying Ti barrier 4 nm Top dielectric layer containing: bottom ZnSnOx layer (0.17) top ZnSnOx layer (0.7) 8 nm 14 nm Protective surface coating made of T| 3 nm

An optimal solar control coating suitable for the present invention may comprise the following sequential layers:

a main dielectric layer comprising a main dielectric bottom layer and a main dielectric top layer, the composition of which is different from the composition of the main dielectric bottom layer, wherein the main dielectric bottom layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range of 0.5 to 2 by weight, the main dielectric top layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range of 0.02 to 0.5 by weight, a first infrared reflective layer containing silver metal, a first barrier layer, a central dielectric layer comprising a central dielectric bottom layer and a central dielectric top layer that has a composition different from the composition of the central dielectric bottom layer that is in direct contact with the first barrier layer and contains a mixed oxide of Zn and Sn having a Sn/Zn ratio ranging from 0 .5 to 2, wherein the central dielectric top layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio ranging from 0.02 to 0.5 by weight,

- 10 045707 second infrared reflective layer containing metallic silver, second barrier layer, top dielectric layer.

Such an optimal solar control coating suitable for the present invention may comprise the following sequential layers and have the following geometric thicknesses:

a main dielectric layer comprising a main dielectric bottom layer and a main dielectric top layer, the composition of which is different from the composition of the main dielectric bottom layer, wherein the main dielectric bottom layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range of 0.5 to 2 by weight, and has a geometric thickness of 15-25 nm, the main dielectric top layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio ranging from 0.02 to 0.5 by weight, and has a geometric thickness of 5-15 nm , a first infrared reflective layer comprising metallic silver having a geometric thickness of 8-16 nm, a first barrier layer having a geometric thickness of 3-8 nm, a central dielectric layer comprising a central dielectric bottom layer and a central dielectric top layer having a composition different from composition of the central dielectric lower layer, which is in direct contact with the first barrier layer and contains a mixed oxide of Zn and Sn, having a Sn/Zn ratio in the range from 0.5 to 2, and has a geometric thickness of 58-74 nm, while the central dielectric the top layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio ranging from 0.02 to 0.5 by weight, and has a geometric thickness of 5-15 nm, the second infrared reflective layer containing metallic silver, having a geometric thickness of 8 -16 nm, a second barrier layer having a geometric thickness of 3-8 nm, a top dielectric layer having a geometric thickness of 14-22 nm, an optional surface coating having a geometric thickness of 2-8 nm.

An additional optimal solar control coating suitable for the present invention may comprise the following sequential layers:

a main dielectric layer comprising a main dielectric bottom layer and a main dielectric top layer, the composition of which is different from the composition of the main dielectric bottom layer, wherein the main dielectric bottom layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range of 0.5 to 2 by weight, the main dielectric top layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range of 0.02 to 0.5 by weight, a first infrared reflective layer containing silver metal, a first barrier layer, a second dielectric layer comprising a second dielectric bottom layer and a second dielectric top layer, which has a composition different from the composition of the second dielectric bottom layer, which is in direct contact with the first barrier layer and contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range of 0 .5 to 2, a second dielectric top layer that contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range of 0.02 to 0.5 by weight, a second infrared reflective layer containing silver metal, a second barrier layer, a third dielectric layer comprising a third dielectric bottom layer and a third dielectric top layer that has a composition different from the composition of the third dielectric bottom layer that is in direct contact with the second barrier layer and contains a mixed oxide of Zn and Sn having a Sn/Zn ratio of range from 0.5 to 2, wherein the third dielectric top layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range from 0.02 to 0.5 by weight, the third infrared reflective layer containing metallic silver, the third barrier layer, top dielectric layer.

Such additional optimal solar control coating suitable for the present invention may comprise the following sequential layers and have the following geometric thicknesses:

a main dielectric layer comprising a main dielectric bottom layer and a main dielectric top layer, the composition of which is different from the composition of the main dielectric bottom layer, wherein the main dielectric bottom layer contains a mixed oxide of Zn and Sn having

- 11 045707 Sn/Zn ratio in the range from 0.5 to 2 by weight, and has a geometric thickness of 25-35 nm, the main dielectric top layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range from 0.02 to 0.5 by weight, and has a geometric thickness of 5-15 nm, a first infrared reflective layer containing metallic silver having a geometric thickness of 10-16 nm, a first barrier layer having a geometric thickness of 3-8 nm, a second dielectric layer containing a second dielectric bottom layer and a second dielectric top layer, which has a composition different from the composition of the second dielectric bottom layer, which is in direct contact with the first barrier layer and contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range of 0.5 to 2, and has a geometric thickness of 58-74 nm, wherein the second dielectric top layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range of 0.02 to 0.5 by weight, and has a geometric thickness of 5-15 nm, a second infrared reflective layer comprising metallic silver having a geometric thickness of 10-17 nm, a second barrier layer having a geometric thickness of 3-8 nm, a third dielectric layer comprising a third dielectric bottom layer and a third dielectric top layer which has the composition , different from the composition of the third dielectric lower layer, which is in direct contact with the second barrier layer and contains a mixed oxide of Zn and Sn, having a Sn/Zn ratio in the range from 0.5 to 2, and has a geometric thickness of 50-75 nm, with wherein the third dielectric top layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range of 0.02 to 0.5 by weight and has a geometric thickness of 5-15 nm, the third infrared reflective layer containing metallic silver having a geometric thickness of 10-16 nm, a third barrier layer having a geometric thickness of 3-8 nm, a top dielectric layer having a geometric thickness of 20-40 nm, an optional surface coating having a geometric thickness of 2-8 nm.

In some embodiments, the HUD system includes:

a. a light source that projects p-polarized light towards the glazing,

b. said glazing comprising an outer sheet of glass having a first surface and a second surface, and an inner sheet of glass having a first surface and a second surface, wherein the second surface of the inner sheet of glass comprises a first coating, both sheets being bonded by at least one sheet of interlayer material, providing contact between the first surface of the inner sheet of glass (S3) and the second surface of the outer sheet of glass (S2), and is characterized in that said first coating contains:

at least one high refractive index layer having a thickness of from 50 to 100 nm, and at least one low refractive index layer having a thickness of from 70 to 160 nm, wherein the at least one high refractive index layer contains at least at least one of:

Zr, Nb, Sn oxide;

mixed oxide Ti, Zr, Nb, Si, Sb, Sn, Zn, In;

Si, Zr nitride;

mixed nitride Si, Zr, and

With. at least one of the first surface of the inner sheet of glass or the second surface of the outer sheet of glass comprises a second coating comprising the following successive layers:

a main dielectric layer comprising at least a main dielectric bottom layer and a main dielectric top layer having a composition that is different from the composition of the main dielectric bottom layer, wherein the main dielectric top layer comprises any one of zinc oxide or mixed Zn oxide and at least one additional material X, wherein the X/Zn ratio in the main dielectric top layer is from 0.02 to 0.5 by weight and wherein X is one or more materials selected from the group consisting of Sn, Al, Ga, In , Zr, Sb, Bi, Mg, Nb, Ta and Ti, a first infrared reflective layer such as silver, gold, platinum or mixtures thereof, a first barrier layer, a central dielectric layer comprising at least a central dielectric bottom layer and a central a dielectric top layer having a composition that is different from the composition of the central dielectric bottom layer, wherein the central dielectric bottom layer is in direct contact with the first barrier layer and the central dielectric

- 12 045707 skim top layer; the central dielectric top layer comprises any one of zinc oxide or a mixed Zn oxide and at least one additional material Y, in which the Y/Zn ratio in the main dielectric top layer is from 0.02 to 0.5 by weight and in which Y is being one or more materials selected from the group consisting of Sn, Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti, a second infrared reflective layer such as silver, gold, platinum or mixtures thereof, second barrier layer, top dielectric layer.

In other embodiments, the HUD system includes:

a. a light source that projects p-polarized light towards the glazing,

b. said glazing comprising an outer sheet of glass having a first surface and a second surface, and an inner sheet of glass having a first surface and a second surface, wherein the second surface of the inner sheet of glass comprises a first coating, both sheets being bonded by at least one sheet of interlayer material, providing contact between the first surface of the inner sheet of glass (S3) and the second surface of the outer sheet of glass (S2), and is characterized in that said first coating contains:

at least one high refractive index layer having a thickness of from 50 to 100 nm, and at least one low refractive index layer having a thickness of from 70 to 160 nm, wherein the at least one high refractive index layer contains at least at least one of:

oxides of Zr, Nb, Sn;

mixed oxide Ti, Zr, Nb, Si, Sb, Sn, Zn, In;

Si, Zr nitride; mixed nitride Si, Zr, and

With. at least one of the first surface of the inner sheet of glass or the second surface of the outer sheet of glass comprises a second coating comprising the following successive layers:

a main dielectric layer comprising at least a main dielectric bottom layer and a main dielectric top layer having a composition that is different from the composition of the main dielectric bottom layer, wherein the main dielectric top layer comprises any one of zinc oxide or mixed Zn oxide and at least one additional material X, wherein the X/Zn ratio in the main dielectric top layer is from 0.02 to 0.5 by weight and wherein X is one or more materials selected from the group consisting of Sn, Al, Ga, In , Zr, Sb, Bi, Mg, Nb, Ta and Ti, a first infrared reflective layer such as silver, gold, platinum or mixtures thereof, a first barrier layer, a second dielectric layer comprising at least a second dielectric bottom layer and a second a dielectric top layer having a composition that is different from the composition of the second dielectric bottom layer, wherein the second dielectric bottom layer is in direct contact with the first barrier layer and the second dielectric top layer; the second dielectric top layer comprises any one of zinc oxide or mixed oxide Zn and at least one additional material Y, in which the Y/Zn ratio in the second dielectric top layer is from 0.02 to 0.5 by weight and in which Y is being one or more materials selected from the group consisting of Sn, Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti, a second infrared reflective layer such as silver, gold, platinum or mixtures thereof, a second barrier layer, a third dielectric layer comprising at least a third dielectric bottom layer and a third dielectric top layer having a composition that is different from the composition of the third dielectric bottom layer, wherein the third dielectric bottom layer is in direct contact with the second barrier layer and the third dielectric top layer; the third dielectric top layer comprises any one of zinc oxide and Zn mixed oxide and at least one additional material Y, in which the Y/Zn weight ratio in the third dielectric top layer is from 0.02 to 0.5, and in which Y is being one or more materials selected from the group consisting of Sn, Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti, a third infrared reflective layer such as silver, gold, platinum or mixtures thereof, third barrier layer, top dielectric layer.

- 13 045707

In yet other embodiments, the HUD system comprises:

A. a light source that projects p-polarized light towards the glazing,

b. said glazing comprising an outer sheet of glass having a first surface and a second surface, and an inner sheet of glass having a first surface and a second surface, wherein the second surface of the inner sheet of glass comprises a first coating, both sheets being bonded by at least one sheet of interlayer material, providing contact between the first surface of the inner sheet of glass (S3) and the second surface of the outer sheet of glass (S2), and is characterized in that said first coating contains:

at least one high refractive index layer having a thickness of from 50 to 100 nm, and at least one low refractive index layer having a thickness of from 70 to 160 nm, wherein the at least one high refractive index layer comprises at least at least one of:

Zr, Nb, Sn oxide;

mixed oxide Ti, Zr, Nb, Si, Sb, Sn, Zn, In;

Si, Zr nitride; mixed nitride Si, Zr, and

With. at least one of the first surface of the inner sheet of glass or the second surface of the outer sheet of glass comprises a second coating comprising the following successive layers:

a main dielectric layer comprising a main dielectric bottom layer and a main dielectric top layer, the composition of which is different from the composition of the main dielectric bottom layer, wherein the main dielectric bottom layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range of 0.5 to 2 by weight, the main dielectric top layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range of 0.02 to 0.5 by weight, a first infrared reflective layer containing silver metal, a first barrier layer, a central dielectric layer comprising a central dielectric bottom layer and a central dielectric top layer that has a composition different from the composition of the central dielectric bottom layer that is in direct contact with the first barrier layer and contains a mixed oxide of Zn and Sn having a Sn/Zn ratio ranging from 0 .5 to 2, wherein a central dielectric top layer comprises a mixed oxide of Zn and Sn having a Sn/Zn ratio ranging from 0.02 to 0.5 by weight, a second infrared reflective layer containing metallic silver, a second barrier layer, top dielectric layer.

In yet further embodiments, the HUD system comprises:

a. a light source that projects p-polarized light towards the glazing,

b. said glazing comprising an outer sheet of glass having a first surface and a second surface, and an inner sheet of glass having a first surface and a second surface, wherein the second surface of the inner sheet of glass comprises a first coating, both sheets being bonded by at least one sheet of interlayer material, providing contact between the first surface of the inner sheet of glass (S3) and the second surface of the outer sheet of glass (S2), and is characterized in that said first coating contains:

at least one high refractive index layer having a thickness of from 50 to 100 nm, and at least one low refractive index layer having a thickness of from 70 to 160 nm, wherein the at least one high refractive index layer contains at least at least one of:

oxides of Zr, Nb, Sn;

mixed oxide Ti, Zr, Nb, Si, Sb, Sn, Zn, In;

Si, Zr nitride; mixed nitride Si, Zr, and

c. at least one of the first surface of the inner sheet of glass or the second surface of the outer sheet of glass comprises a second coating comprising the following successive layers:

a main dielectric layer comprising a main dielectric bottom layer and a main dielectric top layer, the composition of which is different from the composition of the main dielectric bottom layer, wherein the main dielectric bottom layer contains a mixed oxide of Zn and Sn having

- 14 045707 Sn/Zn ratio ranging from 0.5 to 2 by weight, the main dielectric top layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio ranging from 0.02 to 0.5 by weight, the first infrared reflective radiation layer containing metallic silver, a first barrier layer, a second dielectric layer containing a second dielectric bottom layer and a second dielectric top layer that has a composition different from the composition of the second dielectric bottom layer that is in direct contact with the first barrier layer and contains a mixed an oxide of Zn and Sn having a Sn/Zn ratio in the range of 0.5 to 2, wherein the second dielectric top layer comprises a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range of 0.02 to 0.5 by weight, a second infrared reflective layer comprising metallic silver, a second barrier layer, a third dielectric layer comprising a third dielectric bottom layer, and a third dielectric top layer that has a different composition from the third dielectric bottom layer that is in direct contact with the second barrier layer and contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range of 0.5 to 2, wherein the third dielectric top layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range of 0.02 to 0.5 by weight, third infrared reflective layer containing metallic silver, third barrier layer, top dielectric layer.

In yet further embodiments, the HUD system comprises:

a. a light source that projects p-polarized light towards the glazing,

b. said glazing comprising an outer sheet of glass having a first surface and a second surface, and an inner sheet of glass having a first surface and a second surface, wherein the second surface of the inner sheet of glass comprises a first coating, both sheets being bonded by at least one sheet of interlayer material, providing contact between the first surface of the inner sheet of glass (S3) and the second surface of the outer sheet of glass (S2), and is characterized in that said first coating contains:

at least one high refractive index layer having a thickness of from 50 to 100 nm, and at least one low refractive index layer having a thickness of from 70 to 160 nm, wherein the at least one high refractive index layer contains at least at least one of:

Zr, Nb, Sn oxide;

mixed oxide Ti, Zr, Nb, Si, Sb, Sn, Zn, In;

Si, Zr nitride; mixed nitride Si, Zr, and

c. at least one of the first surface of the inner sheet of glass or the second surface of the outer sheet of glass comprises a second coating comprising the following successive layers:

a main dielectric layer comprising a main dielectric bottom layer and a main dielectric top layer, the composition of which is different from the composition of the main dielectric bottom layer, wherein the main dielectric bottom layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range of 0.5 to 2 by weight, and has a geometric thickness of 15-25 nm, the main dielectric top layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio ranging from 0.02 to 0.5 by weight, and has a geometric thickness of 5-15 nm , a first infrared reflective layer comprising metallic silver having a geometric thickness of 8-16 nm, a first barrier layer having a geometric thickness of 3-8 nm, a central dielectric layer comprising a central dielectric bottom layer and a central dielectric top layer having a composition different from composition of the central dielectric lower layer, which is in direct contact with the first barrier layer and contains a mixed oxide of Zn and Sn, having a Sn/Zn ratio in the range from 0.5 to 2, and has a geometric thickness of 58-74 nm, while the central dielectric the top layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio ranging from 0.02 to 0.5 by weight, and has a geometric thickness of 5-15 nm, the second infrared reflective layer containing metallic silver, having a geometric thickness of 8 -16 nm, second barrier layer having a geometric thickness of 3-8 nm,

- 15 045707 top dielectric layer having a geometric thickness of 14-22 nm, optional surface coating having a geometric thickness of 2-8 nm. In yet further embodiments, the HUD system comprises:

a. a light source that projects p-polarized light towards the glazing,

b. said glazing comprising an outer sheet of glass having a first surface and a second surface, and an inner sheet of glass having a first surface and a second surface, wherein the second surface of the inner sheet of glass comprises a first coating, both sheets being bonded by at least one sheet of interlayer material, providing contact between the first surface of the inner sheet of glass (S3) and the second surface of the outer sheet of glass (S2), and is characterized in that said first coating contains:

at least one high refractive index layer having a thickness of from 50 to 100 nm, and

at least one low refractive index layer having a thickness of from 70 to 160 nm, wherein at least one high refractive index layer contains at least one of:

oxides of Zr, Nb, Sn;

mixed oxide Ti, Zr, Nb, Si, Sb, Sn, Zn, In;

Si, Zr nitride; mixed nitride Si, Zr, and

With. at least one of the first surface of the inner sheet of glass or the second surface of the outer sheet of glass comprises a second coating comprising the following successive layers:

a main dielectric layer comprising a main dielectric bottom layer and a main dielectric top layer, the composition of which is different from the composition of the main dielectric bottom layer, wherein the main dielectric bottom layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range of 0.5 to 2 by weight, and has a geometric thickness of 25-35 nm, the main dielectric top layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio ranging from 0.02 to 0.5 by weight, and has a geometric thickness of 5-15 nm , a first infrared reflective layer comprising metallic silver having a geometric thickness of 10-16 nm, a first barrier layer having a geometric thickness of 3-8 nm, a second dielectric layer comprising a second dielectric bottom layer and a second dielectric top layer which has a composition, different from the composition of the second dielectric bottom layer, which is in direct contact with the first barrier layer and contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range from 0.5 to 2, and has a geometric thickness of 58-74 nm, wherein a second dielectric top layer comprising a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range of 0.02 to 0.5 by weight and having a geometric thickness of 5-15 nm, a second infrared reflective layer containing metallic silver having a geometric thickness a thickness of 10-17 nm, a second barrier layer having a geometric thickness of 3-8 nm, a third dielectric layer comprising a third dielectric bottom layer and a third dielectric top layer that has a composition different from the composition of the third dielectric bottom layer that is in direct contact with a second barrier layer and contains a Zn and Sn mixed oxide having a Sn/Zn ratio ranging from 0.5 to 2, and has a geometric thickness of 50-75 nm, wherein the third dielectric top layer contains a Zn and Sn mixed oxide having a ratio Sn/Zn in the range of 0.02 to 0.5 by weight, and has a geometric thickness of 5-15 nm, a third infrared reflective layer containing metallic silver having a geometric thickness of 10-16 nm, a third barrier layer having a geometric thickness 3-8 nm, top dielectric layer having a geometric thickness of 20-40 nm, optional surface coating having a geometric thickness of 2-8 nm.

Variations may be made to the first coating of the present invention, which may comprise a first layer of high refractive index material in contact with the glass, and a first layer of low refractive index material above the first layer of high refractive index material, and a second layer of high refractive index material. refraction over a first layer of low refractive index material, and a second layer of low refractive index material over a second layer of high refractive index material.

In all embodiments described above, the second coating may be located on

- 16 045707 on the first surface of the inner glass sheet (S3) or on the second surface of the outer glass sheet (S2).

Also disclosed is a method for providing a real HUD system, including the following steps:

a. providing glazing by assembling a first or outer sheet of glass, at least one sheet of interlayer material, and a second or inner sheet of glass comprising a first coating on its second surface that comprises at least one high refractive index layer having thickness from 50 to 100 nm, and

at least one low refractive index layer having a thickness of from 70 to 160 nm, wherein at least one high refractive index layer contains at least one of:

Zr, Nb, Sn oxide;

mixed oxide Ti, Zr, Nb, Si, Sb, Sn, Zn, In;

Si, Zr nitride;

a mixed Si, Zr nitride, wherein the intermediate layer provides contact between the first surface of the inner glass sheet (S3) and the second surface of the outer glass sheet (S2),

b. providing a light source capable of projecting p-polarized light,

c. placing said light source such that it projects said p-polarized light towards said glazing at an incidence angle of between 42 and 72°.

Glazing is typically provided by initially depositing first and second coatings onto respective glass surfaces.

Methods for depositing the first and second coatings onto the respective glass surfaces include CVD, PECVD, PVD, magnetron sputtering, wet coating, etc. Different layers of corresponding coatings can be deposited using different technical solutions.

In some embodiments, at least one low refractive index layer of the first coating may be deposited onto a second sheet of glass using a PECVD method, such as a hollow cathode method. This method provides the added benefit of reduced costs and high settling rates.

In the context of the present invention, the inner sheet of glass provided with a first coating may be subjected to heat treatment if said first coating is capable of withstanding such heat treatment. In some cases, the inner sheet of glass provided with the first coating is subjected to heat treatment.

The step of assembling 2 sheets of glass and at least one intermediate layer may be a layering step for flat glass or may be a bending step for curved laminated glass, said bending step comprising the steps of firstly bending the glass sheets and secondly , layering said bent sheets of glass.

In some cases, it may be useful to mechanically strengthen the outer sheet of glass by heat treatment to improve its resistance to mechanical constraints. It may also be necessary to bend vehicle glazing at high temperatures for specific applications.

Thermal treatments include heating the glazing to a temperature of at least 560°C in air, for example from 560°C to 700°C, in particular from about 640°C to 670°C, for about 3, 4, 6, 8, 10, 12 or even 15 minutes depending on the type of heat treatment and the thickness of the glazing. The treatment may include a rapid cooling step after a heating step to introduce a stress difference between the surfaces and the core of the glass so that in the event of an impact the sheet is so-called. Tempered glass shattered safely into small pieces. If the cooling stage is softer, the glass will simply become heat-strengthened and in any case will have improved mechanical strength.

The present glazing may be used in transportation-related applications or in construction-related applications where the projection of images or light from a p-polarized light source may be used. Construction related applications include displays, windows, doors, partitions, shower panels, etc. In such construction-related applications, projection of a clear image may be used to display information about a room or building or the like.

Transportation applications include those vehicles used for transportation by road, air, and water, such as automobiles, buses, trains, ships, airplanes, spacecraft, space stations, and other motorized vehicles.

The actual glazing may thus be a windshield, a rear window, or

- 17 045707 glass windows, sunroof, panoramic roof or any other window used in a car, or any glazing for any other vehicle where projection of a clear image may be used. Projected and reflected information may include any traffic information such as directions or traffic density; or any information about the condition of the vehicle, such as speed, temperature, etc. The wide field of view and uniform surface coverage of the first coating and optional second coating, which are both heat-resistant, allow for a variety of viewing angles and can thus accommodate tall and short observers/drivers.

In some cases, vehicle glazing may serve as heated vehicle glazing. Such heated vehicle glazing includes a heated windshield.

In some embodiments, a second light source may be present in the HUD system and provide a secondary image or information. The second light source may be non-polarized, or may be p-polarized or s-polarized, but provide an image that is the same or different from the first light source. In some cases, the image or information differs between the first and second light sources. In some cases, augmented reality information may be projected by at least one of the light sources due to a wide field of view and/or projection field.

In some special circumstances, the first coating may be removed on at least one specific surface, whereby the present invention may be compatible for use in advanced driver assistance systems (ADAS).

When a second light source is present, the intermediate layer may be a wedge-shaped intermediate layer.

Within the scope of the present invention, the presence of the first coating on the vehicle glazing provides optimal light reflection of p-polarized light. The projected and reflected image will generally be crisp and clear, with a clear outline and surface. The specified surface, as a rule, increases in the case of a blurred image due to the unsatisfactory quality of reflection of p-polarized light from the glazing. The difference between a clear and blurred image outline is minimal if the reflective properties of the glazing are optimal.

The choice of materials for the first coating is critical to combine optical properties with heat and wear resistance, since processing of such glazing typically involves bending and/or tempering the coated glass at temperatures typically between 600 and 700°C. In addition, the end-use conditions require the coating to be on the outer surface of the glazing facing the interior of the vehicle or building, which involves exposure to various types of cleaning agents, humidity, contamination and mechanical wear. The present glazing in the HUD system ensures the proper functioning of said HUD system, with the first coating having a p-polarized light reflectance of >4.0%; alternatively >6.0%, alternatively >7.0%, alternatively >9.0%, alternatively >10.0%, at an angle of incidence of p-polarized light from 42 to 72°, alternatively at an angle of 55°.

The present invention also provides the use of a sheet of glass containing a first coating on one of its surfaces, said coating comprising:

at least one high refractive index layer having a thickness of from 50 to 100 nm, and at least one low refractive index layer having a thickness of from 70 to 160 nm, wherein the at least one high refractive index layer contains at least at least one of:

Zr, Nb, Sn oxide;

mixed oxide Ti, Zr, Nb, Si, Sb, Sn, Zn, In;

Si, Zr nitride;

mixed nitride Si, Zr, in a HUD system containing a p-polarized light source that projects light onto the glazing at an incidence angle of 42 to 72° to reflect said p-polarized light.

This glazing has the advantage of optimal reflection of p-polarized light when projected at an incidence angle of 42 to 72°.

Examples

All optical parameters are given for illuminant D65, 2° for reflectance or transmittance levels and illuminant D65, 10° for color indices (a* and b*).

All refractive indices are measured at 550 nm unless otherwise stated.

Glazing units were provided comprising a first sheet of 1.8 mm thick clear float glass and a second sheet of 1.4 mm thick clear float glass, on which a 0.76 mm thick clear PVB sheet was laminated. Several feathers were deposited onto the second surface of the inner glass sheet (S4).

- 18 045707 high coatings, with a high/low sequence as indicated in the following tables.

A second coating containing 2 silver layers and 3 dielectric layers could be deposited on the first surface of the inner glass sheet (S3), as will be indicated in subsequent examples.

The glazings were then placed in the path of the light emitted by the light source. The light source is configured to emit normal light or p-polarized light. The behavior of glazing in relation to incident light is presented in the following tables.

The parameters measured relative to external reflection (Rv( _out )) were as follows:

a) light source A, 2°

Tv = transmittance in the visible range,

Rv( _out ) (%)= external reflection in the visible range at a standard incidence angle of 8°,

Rv( _in ) (%) = internal reflection in the visible range for unpolarized light at an angle of incidence close to Brewster's angle (55°), also denoted as R125(in) if the angle of incidence is measured from the opposite side of the glazing (i.e. .180-55°),

Rp_pol (%). 55°),

R172( _in )(%) = internal reflection in the visible range at a standard incidence angle of 8° (or 172° if applied to the external surface of the glazing);

b) light source D65, 2°

Tv (%)= visible transmittance;

c) light source D65, 10° a* R _out = a* color index of external reflection at 8°, b* Rout = b* color index of external reflection at 8°, a*_R _in = a* R125 = a* color index internal reflection at 125°, b*_R _in = b* R125 = b * color index of internal reflection at 125°, a*_R _p _ _pol = a* R125p_pol = a* color index of internal reflection at 125° for polarized light, b *_R _p _ _pol = b* R125p_pol = b* color index of internal reflection at 125° for polarized light, a* R172 = a* color index of internal reflection at 172°, b* R172 = b* color index of internal reflection at 172° .

The results overall show that visible light transmittance is >70%, external reflectance is maintained at a moderate level with attractive aesthetic reflectance properties as shown by color performance at 8° and 55° angles, optical properties at internal reflectance such as Rp-pol at incidence 55°, improve with 4 layers or more, to 13-14% while maintaining global internal reflection at 55° from 14 to 17% using high-index layers of 65/35 wt titanium/zirconium mixed oxide. %, optionally with mixed oxide of silicon and titanium in a ratio of 92/8 wt.%; and with a low refractive index layer of silicon oxide doped with aluminum (2%).

These results indicate the suitability of the present vehicle glazing in the proposed HUD system.

Examples 1-5, Comparative Example 1

Glazing units were provided comprising a first sheet of 1.8 mm thick clear float glass and a second sheet of 1.4 mm thick clear float glass, on which a 0.76 mm thick clear PVB sheet was laminated. The first few coatings were deposited onto the inner sheet of glass in a high/low sequence as indicated in Table 1. 2 and 3.

In Examples 1 to 5 and Comparative Example 1, a high refractive index layer was provided having the same optical thickness of 172.3 nm, while the low refractive index layer had the same optical thickness of 145.1 nm. Thus, geometric thickness and refractive index are given in tables where geometric thickness = optical thickness/refractive index.

Comparative Example 1, based on titanium oxide with a refractive index of 2.35 (550 nm), had a p-polarized light reflectance of 10.2% at an incident angle of 55°.

Example 1 based on TZO with a refractive index of 2.33 (550 nm) had a p-polarized reflectance of 9.9% at an incident angle of 55°. Example 2 with SiZrN had p-polarized light reflectance >7.0% at 55° incidence. Example 3 with TSO had >6.0% p-polarized light reflectance at 55° incidence. Examples 4 and 5 with SiN and zinc tin oxide, respectively, had >4.0% p-polarized light reflectance at an incident angle of 55°. All of them had satisfactory aesthetic properties in terms of color indicators.

The best materials for a high refractive index layer, in order of effect

- 19 045707 activities are thus mixed titanium and zirconium oxide with a refractive index >2.0, providing reflection of p-polarized light >9.0% at an angle of incidence of 55°, mixed silicon and zirconium nitride, mixed titanium and silicon oxide , aluminum alloyed silicon nitride and mixed zinc tin oxide.

The first coatings according to examples 1-5 were able to withstand heat treatment and retain their optical properties, while comparative example 1 did not withstand heat treatment.

Examples 6-13

Glazing units were provided comprising a first sheet of 1.8 mm thick clear float glass and a second sheet of 1.4 mm thick clear float glass, on which a 0.76 mm thick clear PVB sheet was laminated. The first few coatings were deposited onto the inner sheet of glass in a high/low sequence as indicated in Table 1. 4 and 5.

The high refractive index layer in Example 6 was TZO, and the high refractive index layer in Examples 7-11 was based on TZO and TSO sublayers. The high refractive index layer in Examples 12 and 13, having two high/low sequences, was TZO or TSO.

The optical properties indicated satisfactory aesthetic properties in terms of color performance.

Examples 6 and 7 had >10.0% p-polarized light reflectance at 55° incidence. Examples 8-11 had p-polarized light reflectance >9.0% at 55° incidence. Examples 12 and 13 had p-polarized light reflectance >12.0% at 55° incidence.

Examples 14-22

The glazings of Examples 14-22 were provided, comprising a first sheet of 1.8 mm thick clear float glass and a second sheet of 1.4 mm thick clear float glass, upon which a 0.76 mm thick clear PVB sheet was laminated. The first few coatings were deposited on the second surface of the inner glass sheet (S4) in a high/low sequence as indicated in Table 1. 6 and 7.

A second coating containing 2 silver layers and 3 dielectric layers was deposited on the first surface of the inner glass sheet (S3) as indicated in Table 1. 1 about the package, and deposition was carried out by vacuum deposition:

Table 1 about the package

Glass ZnSnOx ZnO Ag TiOx ZnSnOx ZnO Ag TiOx ZnSnOx TiOx nm 19 10 10.5 6 66 10 9.4 5.3 19 5

The high refractive index layer in Examples 14-18 was based on TZO and TSO sublayers. The high refractive index layers in Examples 19 and 22, having two high/low sequences, were TZO or TSO.

The optical properties indicated satisfactory aesthetic properties in terms of color performance.

Examples 14-18 had >10.0% p-polarized light reflectance at an incident angle of 55° (Table 7). Examples 19-22 had p-polarized light reflectance >13.0% at an incident angle of 55° (Table 7).

Examples 23-27, Comparative Example 2

The glazings of Examples 23-27 were provided, comprising a first sheet of 1.8 mm thick clear float glass and a second sheet of 1.4 mm thick clear float glass, upon which a 0.76 mm thick clear PVB sheet was laminated. The first few coatings were deposited on the second surface of the inner glass sheet (S4) in a high/low sequence as indicated in Table 1. 8 and 9.

A second coating containing 2 silver layers and 3 dielectric layers was deposited on the first surface of the inner glass sheet (S3) as indicated in Table 1. 1 about the package.

Comparative Example 2, based on titanium oxide with a refractive index of 2.35 (550 nm), had a p-polarized light reflectance of 11.29% at an incident angle of 55°.

Example 23 based on TZO with a refractive index of 2.33 (550 nm) had a reflectance of polarized light of 10.99% at an incident angle of 55°. Example 24 with SiZrN had polarized light reflectance >8.0% at an incident angle of 55°. Example 25 with TSO had polarized light reflectance >7.0% at 55° incidence. Examples 26 and 27 with SiN:Al and zinc tin oxide, respectively, had >5.0% p-polarized light reflectance at 55° incidence. All of them had satisfactory aesthetic properties in terms of color indicators.

The first coatings according to examples 23-27 were able to withstand heat treatment and retain their optical properties, while comparative example 2 did not withstand heat treatment.

Examples 28-30

Glazings according to Examples 28-30 were provided, comprising a first sheet of 2.1 mm thick float glass and a second sheet of 1.6 mm thick float glass, on which

- 20 045707 layered colorless PVB sheet with a thickness of 0.76 mm. The first few coatings were deposited on the second surface of the inner glass sheet (S4) in a high/low sequence as indicated in Table 1. 10 and 11.

In Example 29, a second coating containing 2 silver layers and 3 dielectric layers was deposited on the first surface of the inner glass sheet (S3) as indicated in Table 1. 1 about the package.

Example 28 based on TZO with a refractive index of 2.33 (550 nm) had a p-polarized reflectance of 10.4% at an incident angle of 55°. Example 29 had p-polarized light reflectance >11.0% at an incident angle of 55°. Example 30 had p-polarized light reflectance >12.0% at an incident angle of 55°.

All examples 28-30 had satisfactory aesthetic properties in terms of color performance.

The first coatings according to examples 28-30 were able to withstand heat treatment and retain their optical properties. A comparative example with a TiO ₂ layer as a high refractive index layer was not provided because it did not withstand heat treatment.

Example 31, Comparative Examples 3 and 4

Comparative Examples 3 and 4 refer to Examples 3 and 5 of WO2019/046157A1 having a p-polarized light reflectance of 11.52% and 11.15% respectively, together with an overall reflectance of 15.84% and 15.46% respectively ( after recalculation).

Example 31 was provided with a first coating having a high index TZO layer 73.2 nm thick and a low index SiO ₂ layer 99.5 nm thick. Example 31 has a p-polarized light reflectance of 11.30% and a total reflectance of 12.10%.

This indicates that for equivalent reflection of p-polarized light, the first coating in the HUD of the present invention provides less reflection, which is used to reduce irritation, for example, from the reflection of a dashboard on a vehicle window.

Examples 32 and 33, Comparative Examples 5-9-Table 12

Example 32 was provided with a first coating having a 65 nm thick high index TZO layer and an 80 nm thick low index SiO ₂ layer. Example 32 has a total reflectance of 12.4% and a p-polarized light reflectance of 10.4%.

Example 33 was provided with a first coating having a high index TZO layer 80 nm thick and a low index SiO ₂ layer 110 nm thick. Example 33 has a total reflectance of 12.6% and a p-polarized light reflectance of 9.1%.

Both examples 32 and 33 are able to withstand the heat treatment of the bending step carried out at a temperature of 650°C for 5 minutes.

Comparative Example 5 was provided with a first coating having a high refractive index TZO layer with a thickness of 40 nm and a low refractive index SiO ₂ layer with a thickness of 65 nm. Both values are outside the ranges stated for high and low refractive index layers. Comparative Example 5 has a total reflectance of 19.6% (>21%) and a p-polarized light reflectance of 7.5% (<8%).

Comparative Example 6 was provided with a first coating having a high refractive index TZO layer with a thickness of 40 nm and a low refractive index SiO2 layer with a thickness of 170 nm. Both values are outside the ranges stated for high and low refractive index layers. Comparative example b has a total reflectance of 22.60% (>21%) and a p-polarized light reflectance of 7.5% (<8%).

Both Comparative Examples 5 and 6 are able to withstand the heat treatment of the bending step performed at 650°C for 5 minutes due to the presence of TZO, however the thickness ranges are outside the stated optical properties in terms of total reflectance and p-polarized reflectance. light makes them unsuitable for the purposes of the present invention.

Comparative Example 7 was provided with a first coating having a high refractive index layer of TiO ₂ with a thickness of 65.6 nm and a low refractive index layer of SiO ₂ with a thickness of 102 nm according to Example 1 of CN204166197U. Comparative Example 7 has a total reflectance of 12.4% and a p-polarized light reflectance of 11.5%. Although Comparative Example 7 is within acceptable ranges for optical measurements, it failed the heat treatment of the bending step performed at 650° C. for 5 minutes due to the presence of titanium dioxide as the high refractive index layer material.

Comparative Example 8 was provided with a first coating having 4 layers, with a ZSO layer in contact with 13.8 nm thick glass, and a SiON layer having a refractive index of 1.45 to 1.9, 76.1 nm thick, underneath the layer of high refractive index TiO ₂ with a thickness of 74 nm, and a layer of SiO ₂ with a thickness of 92.1 nm, according to Embodiment 1 of document CN206147178U.

- 21 045707

Comparative Example 9 was provided with a first coating having 3 layers, with a 128 nm thick ZSO layer in contact with glass, under a 75 nm thick high refractive index TiO ₂ layer, and a 110 nm thick SiO ₂ layer, according to Embodiment 3 from document CN206147178U.

Although Comparative Examples 8 and 9 are within acceptable ranges for optical measurements, they failed the heat treatment of the bending step performed at 650° C. for 5 minutes due to the presence of titanium dioxide as the high refractive index layer material.

Examples 34 and 35, Comparative Examples 10 and 11 - Table 13

Example 34 was provided with a first coating having a first layer of high index TZO 2 nm thick, a first layer of low index SiO ₂ 165 nm thick, a second layer of high index TZO 55 nm thick, a second layer of SiO ₂ with a low refractive index thickness of 75 nm. Example 34 has a total reflectance of 17.3% and a p-polarized light reflectance of 11.7%.

Example 35 was provided with a first coating having a first high index TZO layer 12 nm thick, a first low index SiO ₂ layer 168 nm thick, a second high index TZO layer 80 nm thick, a second SiO ₂ layer with a low refractive index thickness of 120 nm. Example 35 has a total reflectance of 20.4% and a p-polarized light reflectance of 14.6%.

Both examples 34 and 35 are able to withstand the heat treatment of the bending step performed at 650° C. for 5 minutes.

Comparative Example 10 was provided with a first high refractive index TZO layer 18 nm thick, a first low refractive index SiO ₂ layer 140 nm thick, a second high refractive index TZO layer 40 nm thick, a second low refractive index SiO 2 layer 170 nm thick. Layer thickness values are outside the ranges stated for high and low refractive index layers. Comparative Example 10 has an overall reflectance of 36.2% (>21%), a p-polarized light reflectance of 13.6%, and a light transmittance of 62.0% (<70.0%, which is unacceptable in the automotive industry).

Comparative Example 11 was provided with a first high refractive index TZO layer of 25 nm thickness, a first low refractive index SiO ₂ layer of 130 nm thickness, a second high refractive index TZO layer of 30 nm thickness, a second low refractive index SiO ₂ layer refractive index 65 nm thick. Layer thickness values are outside the ranges stated for high and low refractive index layers. Comparative Example 11 has an overall reflectance of 37.6% (>21%), a p-polarized light reflectance of 10.8%, and a light transmittance of 61.1% (<70.0%).

- 22 045707

example 1 Example 1 TZO/SiO2 73.9/99.5 2.33/1.46 14.9 9.9 6.87 -1.98 -2.73 11.62 10.7 -2.31 -10.74 Example 2 SiZrN/SiO2 78.0/99.5 2.21/1.46 12.3 7.3 7.43 -3.44 -1.90 9.56 8.3 -1.73 -13.23 Example 3 TSO/SiO2 79.4/99.5 2.17/1.46 12.4 6.8 7.08 -4.10 -2.69 9.03 8.1 -2.24 -13.62 Example 4 SiN/SiO2 84.9/99.5 2.03/1.46 10.2 4.3 7.04 -4.12 -1.04 7.21 6.0 -0.93 -15.46 Example 5 ZSO5/SiO2 85.3/99.5 2.02/1.46 10.5 4.3 6.83 -3.96 -1.41 7.07 6.2 -1.24 -15.18

Table 4

Route incidence angle 8° incidence angle 55° incidence angle 35° Geometric thickness (nm) TV (illA) TV (illD65, 2°) Rv(out) a*_Rout b*_Rout a*_R55 b*_R55 a*_R35 b*_R35 Example 6 TZO/SiO2 64.8/ 131.5 79.04 77.47 18.50 -11.76 -11.75 -3.62 -15.94 -8.77 -16.52 Example 7 TZO/TSO/5iO2 63.9/1.0/124.0 81.47 80.01 16.14 -10.05 -14.67 -0.38 -15.38 -6.10 -17.95 Example 8 TZO/TSO/SiO2 45.3 / 25.0 / 126.6 80.12 78.68 17.45 -12.21 -10.12 -3.68 -15.21 -9.15 -15.33 Example 9 TZO/TSO/SiO2 45.8/25.0/116.3 83.32 82.07 14.35 -9.72 -13.74 0.77 -13.89 -5.33 -16.87 Example 10 TZO/TSO/5iO2 38.9/32.5/125.8 80.77 79.39 16.82 -12.37 -9.50 -3.61 -14.95 -9.25 -14.91 Example 11 TZO/TSO/SiO2 39.5/32.5/ 117.5 83.29 82.05 14.37 -10.54 -12.38 -0.12 -14.03 -6.33 -16.21 Example 12 TZO/SiO2/TSO/SiO2 11.2/157.7/64.1/123.2 78.90 77.74 18.70 -16.48 2.72 -2.00 -14.65 -12.47 -8.30 Example 13 TSO/SiO2/TZO/SiO2 6.0/171.1/63.9/116.9 81.28 80.45 16.40 -7.71 -7.51 0.29 -8.81 -5.69 -8.83

Table 5

Rin incidence angle 55° incidence angle 172° Geometric thickness (nm) Rv(in) Rp_pol a*_Rin b*_Rin a*_Rp_pol b*_Rp_pol R172(in) a*_R172 b*_R172 Example 6 TZO/SiO2 64.8/ 131.5 15.71 10.39 -2.81 -17.44 -3.01 2.16 18.91 -11.10 -12.77 Example 7 TZO/TSO/SiO2 63.9/1.0/124.0 14.87 10.39 0.52 -16.78 -3.02 2.18 16.46 -9.36 -15.80 Example 8 TZO/TSO/5iO2 45.3 / 25.0 / 126.6 14.98 9.54 -2.97 -16.64 -3.02 3.85 17.82 -11.68 -11.01 Example 9 TZO/TSO/5iO2 45.8/25.0/116.3 13.99 9.53 1.59 -15.13 -3.02 4.40 14.59 -9.18 -14.76 Example 10 TZO/TSO/5iO2 38.9 / 32.5 / 125.8 14.54 9.03 -2.96 -16.34 -2.97 4.63 17.17 -11.91 -10.33 Example 11 TZO/TSO/5iO2 39.5/32.5/ 117.5 13.69 9.03 0.62 -15.28 -2.96 5.29 14.62 -10.09 -13.31 Example 12 TZO/SiO2/TSO/SiO2 11.2/157.7/64.1/123.2 17.86 12.34 -0.90 -16.04 -9.16 4.03 19.13 -16.18 2.31 Example 13 TSO/SiO2/TZO/SiO2 6.0/171.1/63.9/116.9 17.87 13.15 1.26 -9.79 -5.30 9.23 16.75 -6.99 -8.47

Route

Table 6

incidence angle 8° angle of incidence 55° angle of incidence 35° Geometric thickness (nm) TV (illA) TV (illD65, 2°) Rv(out) a*_Rout b*_Rout a*_R55 b*_R55 a*_R35 b*_R35 Example 14 TZO/TSO/5iO2 65.1/0.1/111.1 74.57 73.50 13.68 -9.65 -13.21 -0.01 -11.43 -5.87 -14.52 Example 15 TZO/TSO/5iO2 45.5/25.0/93.0 76.99 76.57 11.65 -5.28 -10.64 1.53 -4.32 -1.92 -9.24 Example 16 TZO/TSO/SiO2 45.6/25.0/101.1 76.20 75.41 12.30 -8.25 -12.30 0.99 -8.89 -4.32 -12.78 Example 17 TZO/TSO/SiO2 39.3 / 32.5 / 90.8 77.48 77.15 11.23 -4.91 -9.96 1.62 -3.56 -1.61 -8.44 Example 18 TZO/TSO/SiO2 39.2 / 32.5 / 97.9 76.94 76.28 11.67 -7.50 -11.78 1.35 -7.64 -3.58 -11.84 Example 19 TZO/SiO2/TSO/SiO2 13.3/168.5/66.3/98.3 74.61 74.67 13.78 -7.77 5.20 0.71 -0.43 -4.43 2.21 Example 20 TZO/SiO2/TSO/SiO2 10.1/163.8/70.5/113.0 72.36 71.68 15.64 -14.00 2.58 -2.97 -9.45 -11.92 -3.79 Example 21 TSO/SiO2/TZO/SiO2 10.9/172.4/63.5/101.3 73.46 73.39 14.75 -6.20 -0.22 0.23 -1.10 -4.41 -0.01 Example 22 TSO/SiO2/TZO/SiO2 6.3/197.2/65.3/114.4 73.90 73.17 14.30 -5.92 -12.61 -1.93 -7.21 -5.74 -9.75

- 23 045707

Table 7

Rin

incidence angle 55° incidence angle 172° Geometric thickness (nm) Rv(in) Rp_pol a*_Rin b*_Rin a*_Rp_pol b*_Rp_pol R172(in) a*_R172 b*_R172 Example 14 TZO/TSO/SiO2 65.1/0.1/111.1 14.30 11.43 5.54 -15.49 -1.86 -7.76 13.84 -7.60 -18.30 Example 15 TZO/TSO/SiO2 45.5/25.0/93.0 15.44 10.61 7.37 -4.42 -1.76 -7.34 11.18 -2.02 -15.24 Example 16 TZO/TSO/SiO2 45.6/25.0/101.1 14.07 10.61 6.89 -11.59 -1.74 -7.36 12.01 -5.93 -17.27 Example 17 TZO/TSO/SiO2 39.3 / 32.5 / 90.8 15.23 10.11 7.47 -3.15 -1.63 -7.18 10.62 -1.56 -14.39 Example 18 TZO/TSO/5iO2 39.2 / 32.5 / 97.9 13.96 10.11 7.35 -9.61 -1.63 -7.30 11.18 -5.00 -16.67 Example 19 TZO/SiO2/TSO/SiO2 13.3/168.5/66.3/98.3 21.16 14.37 6.06 0.55 -7.24 2.52 14.02 -5.73 6.23 Example 20 TZO/SiO2/TSO/SiO2 10.1/163.8/70.5/113.0 17.03 13.01 1.30 -12.77 -6.25 0.23 16.44 -13.68 2.24 Example 21 TSO/SiO2/TZO/SiO2 10.9/172.4/63.5/101.3 21.04 15.76 5.39 -0.58 -5.22 2.85 15.31 -3.42 -1.57 Example 22 TSO/SiO2/TZO/SiO2 6.3/197.2/65.3/114.4 16.32 13.32 2.42 -9.60 -1.21 0.45 14.67 -2.59 -17.82

Table 8

Route incidence angle 8° incidence angle 55° incidence angle 35° Geometric thickness (nm) Tv (I1A,2°) TV (illD65.2°) Rv(out) a*_Rout b*_Rout a*_R55 b*_R55 a*_R35 b*_R35

Comparative example 2 TiO2/SiO2 73.2/99.5 76.17 75.65 12.34 -7.84 -7.99 1.29 -5.71 -3.92 -8.60 Example 23 TZO/5iO2 73.4/98.5 76.51 76.01 12.04 -7.77 -8.12 1.27 -5.44 -3.82 -8.54 Example 24 SiZrN/SiO2 77.1/85.7 76.85 76.84 10.18 -3.26 -5.29 1.36 0.35 -0.71 -3.28 Example 25 TSO/SiO2 79.2/84.5 79.23 79.26 9.74 -3.54 -5.60 1.30 -0.02 -0.85 -3.70 Example 26 SiN:AI/SiO2 80.1/77.7 78.54 78.75 9.28 -2.39 -1.81 -0.42 2.19 -1.28 0.46 Example 27 ZSO5/SiO2 81.5/77.4 79.82 80.01 9.13 -2.50 -2.41 -0.29 1.92 -1.23 -0.14

Table 9

Rin angle of incidence 55° angle of incidence 172°

Geometric thickness (nm) Rv(in) Rp_pol a*_Rin b*_Rin a*_Rp_pol b*_Rp_pol R172(in) a*_R172 b*_R172 Comparative example 2 TiO2/SiO2 73.2/99.5 14.72 11.29 7.07 -6.79 -0.91 -2.74 12.08 -5.68 -11.49 Example 23 TZO/SiO2 73.4/98.5 14.65 10.99 7.05 -6.33 -1.35 -3.22 11.69 -5.59 -11.69 Example 24 SiZrN/SiO2 77.1/85.7 14.57 8.44 7.13 3.71 -0.65 -6.22 8.81 0.56 -8.46 Example 25 TSO/SiO2 79.2/84.5 14.62 7.93 6.75 3.02 -1.06 -7.65 8.66 0.17 -8.42 Example 26 SiN:AI/SiO2 80.1/77.7 14.35 5.57 4.20 7.34 0.17 -12.52 7.72 1.97 -3.35 Example 27 ZSO5/SiO2 81.5/77.4 14.48 5.58 4.07 7.40 -0.31 -12.37 7.82 1.61 -3.39

Table 10

Tr Tr Route % % at 55° Y a* b* Y_8° a*_8° b*_8° Y_55° a*_55° b*_55' Geometric thickness (nm) Y A/2° A/2° D65/2° A/2° Example 28 TZO/SiO2 64.7/123.6 83.1 83.1 2.4 7.3 16.2 -7.7 -15.4 15.1 1.4 -17.9 Example 29 TZO/SiO2 64.7/123.6 70.2 2.7 6.4 16.7 -5.8 -7.7 Example 30 TZO/SiO2/TZO/SiO2 3.4/173.9/65.2/112.6 83.1 2.0 4.9 15.7 -6.7 -10.6 17.5 4.2 -12.1

- 24 045707

Table 11

Rpp Rin % at 55° % at 55° R_55° a*_55° b*_55° Y_8° a*_8° b*_8° Y_55° a*_55° b*_55' Geometric thickness (nm) A/2° Cielab/D65/10° D65/2° A/2° Example 28 TZO/SiO2 64.7/123.6 10.4 -2.3 1.5 16.3 -7.4 -15.9 15.2 1.0 -17.0 Example 29 TZO/SiO2 64.7/123.6 11.5 -1.4 -4.3 14.9 Example 30 TZO/SiO2/TZO/SiO2 3.4/173.9/65.2/112.6 12.5 -5.3 0.9 15.8 -6.4 -11.0 17.7 4.5 -12.7

Table 12

TV Rv(in) Rp_pol % at 8° % at 55° Geometric thickness (nm) A 2° A 2° A 2° Example 32 TZO/SiO2 65/80 85.8 12.4 10.4 Example 33 ΤΖΟ/5ΪΟ2 80/110 85.3 12.6 9.1 Comparative Example 5 TZO/SiO2 40/65 78.7 19.6 7.5 Comparative Example 6 TZO/SiO2 40/170 75.4 22.6 7.5 Comparative example 7 TiO2/SiO2 65.6/102 85.6 12.4 11.5 Comparative Example 8 ZSO/SiON/TiO2/SiO2 13.8/76.1/74/92.1 85.7 12.3 10.2 Comparative Example 9 ZSO/TiO2/SiO2 128/75/110 84.7 13.0 9.6

Table 13

TV Rv(in) Rp_pol % at 8° Geometric thickness (nm) A 2° A 2° A 2° Example 34 TZO/SiO2/TZO/SiO2 2/165/55/75 81.1 17.3 11.7 Example 35 TZO/SiO2/TZO/SiO2 12/168/80/120 77.9 20.4 14.6 Comparative Example 10 TZO/SiO2/TZO/SiO2 18/140/40/170 62.0 36.2 13.6 Comparative Example 11 TZO/SiO2/TZO/SiO2 25/130/30/65 61.1 37.6 10.8

Claims (17)

1. HUD system containing: A. a light source that projects p-polarized light towards the glazing, b. said glazing comprising an outer sheet of glass having a first surface and a second surface, and an inner sheet of glass having a first surface and a second surface, wherein the second surface of the inner sheet of glass comprises a first coating, both sheets being bonded by at least one sheet of intermediate material layer providing contact between the first surface of the inner sheet of glass and the second surface of the outer sheet of glass, characterized in that said first coating contains at least one layer with a high refractive index having a thickness of from 50 to 100 nm, and at least , one low refractive index layer having a thickness of from 70 to 160 nm, wherein at least one high refractive index layer is selected from titanium zirconium mixed oxide, titanium silicon mixed oxide, niobium zirconium mixed oxide, mixed nitride silicon and zirconium, zirconium oxide, indium and tin mixed oxide, zinc and aluminum mixed oxide, antimony and tin mixed oxide, titanium and zinc mixed oxide. 2. HUD system according to claim 1, characterized in that at least one high refractive index layer is selected from titanium-zirconium mixed oxide, titanium-silicon mixed oxide, niobium-zirconium mixed oxide, silicon-zirconium mixed nitride, zirconium oxide. 3. HUD system according to any of the previous points, characterized in that the projected light falls on the glazing at an angle from 42 to 72 degrees. 4. HUD system containing: a. a light source that projects p-polarized light towards the glazing, b. said glazing comprising an outer sheet of glass having a first surface and a second surface, and an inner sheet of glass having a first surface and a second surface, wherein the second surface of the inner sheet of glass comprises a first coating, both sheets being bonded by at least one sheet of intermediate material a layer providing contact between the first surface of the inner sheet of glass and the second surface of the outer sheet of glass, characterized in that said first coating contains: i. a first layer of high refractive index material having a thickness of 1 to 15 nm in contact with the glass, and ii. a first layer of low refractive index material having a thickness of 150 to 220 nm above the first layer of high refractive index material, and iii. a second layer of high refractive index material having a thickness of 50 to 100 nm above the first layer of low refractive index material, and iv. a second layer of low refractive index material having a thickness of from 70 to 160 nm above the second layer of high refractive index material, wherein at least one high refractive index layer is selected from titanium zirconium mixed oxide, titanium silicon mixed oxide , Niobium Zirconium Mixed Oxide, Silicon Zirconium Nitride Mixed, Zirconium Oxide, Indium Tin Mixed Oxide, Zinc Aluminum Mixed Oxide, Antimony Tin Mixed Oxide, Titanium Zinc Mixed Oxide. 5. HUD system containing: a. a light source that projects p-polarized light towards the glazing, b. said glazing comprising an outer sheet of glass having a first surface and a second surface, and an inner sheet of glass having a first surface and a second surface, wherein the second surface of the inner sheet of glass comprises a first coating, both sheets being bonded by at least one sheet of intermediate material a layer providing contact between the first surface of the inner sheet of glass and the second surface of the outer sheet of glass, characterized in that said first coating contains: i. a first layer of high refractive index material having a thickness of 1 to 15 nm in contact with the glass, and ii. a first layer of low refractive index material having a thickness of 100 to 160 nm above the first layer of high refractive index material, and iii. a second layer of high refractive index material having a thickness of 1 to 20 nm above the first layer of low refractive index material, and iv. a second layer of low refractive index material having a thickness of 20 to 60 nm above the second layer of high refractive index material, and v. a third layer of high refractive index material having a thickness of 40 to 100 nm above the second layer of low refractive index material, and vi. a third layer of low refractive index material having a thickness of 80 to 140 nm, - 26 045707 over a third layer of high refractive index material, wherein at least one high refractive index layer is selected from titanium zirconium mixed oxide, titanium silicon mixed oxide, niobium zirconium mixed oxide, silicon zirconium mixed nitride, zirconium oxide, indium tin mixed oxide, zinc aluminum mixed oxide, antimony tin mixed oxide, titanium zinc mixed oxide. 6. HUD system according to any of the previous claims, characterized in that it further comprises a second coating containing n layers based on an IR reflective functional layer and n+1 dielectric layers, where each layer based on an IR reflective functional layer is located between two dielectric layers on at least one of the first surface of the inner glass sheet or the second surface of the outer glass sheet. 7. HUD system according to claim 6, characterized in that the second coating contains the following successive layers: a main dielectric layer comprising at least a main dielectric bottom layer and a main dielectric top layer having a composition that is different from the composition of the main dielectric bottom layer, wherein the main dielectric top layer comprises any one of zinc oxide or mixed Zn oxide and at least at least one additional material X, wherein the X/Zn ratio in the main dielectric top layer is from 0.02 to 0.5 by weight, and wherein X is one or more materials selected from the group consisting of Sn, Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti, a first infrared reflective layer such as silver, gold, platinum or mixtures thereof, a first barrier layer, a central dielectric layer comprising at least a central a dielectric bottom layer and a central dielectric top layer having a composition that is different from the composition of the central dielectric bottom layer, wherein the central dielectric bottom layer is in direct contact with the first barrier layer and the central dielectric top layer; the central dielectric top layer comprises any one of zinc oxide or a mixed Zn oxide and at least one additional material Y, wherein the Y/Zn ratio in the main dielectric top layer is from 0.02 to 0.5 by weight, and in wherein Y is one or more materials selected from the group consisting of Sn, Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti, a second infrared reflective layer such as silver, gold, platinum or mixtures thereof, a second barrier layer, an upper dielectric layer. 8. HUD system according to claim 6, characterized in that the second coating contains the following successive layers: a main dielectric layer comprising at least a main dielectric bottom layer and a main dielectric top layer having a composition that is different from the composition of the main dielectric bottom layer, wherein the main dielectric top layer comprises any one of zinc oxide or mixed Zn oxide and at least at least one additional material X, wherein the X/Zn ratio in the main dielectric top layer is from 0.02 to 0.5 by weight, and wherein X is one or more materials selected from the group consisting of Sn, Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti, a first infrared reflective layer such as silver, gold, platinum or mixtures thereof, a first barrier layer, a second dielectric layer comprising at least a second a dielectric bottom layer and a second dielectric top layer having a composition that is different from the composition of the second dielectric bottom layer, the second dielectric bottom layer being in direct contact with the first barrier layer and the second dielectric top layer; the second dielectric top layer comprises any one of zinc oxide or mixed Zn oxide and at least one additional material Y, wherein the Y/Zn ratio in the second dielectric top layer is from 0.02 to 0.5 by weight, and in wherein Y is one or more materials selected from the group consisting of Sn, Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti, a second infrared reflective layer such as silver, gold, platinum or mixtures thereof, a second barrier layer, a third dielectric layer comprising at least a third dielectric bottom layer and a third dielectric top layer having a composition that is different from the composition of the third dielectric bottom layer, wherein the third dielectric bottom layer is directly in - 27 045707 direct contact with the second barrier layer and the third dielectric top layer; the third dielectric top layer comprises any one of zinc oxide or a mixed Zn oxide and at least one additional material Y, wherein the Y/Zn ratio in the third dielectric top layer is from 0.02 to 0.5 by weight, and in wherein Y is one or more materials selected from the group consisting of Sn, Al, Ga, In, Zr, Sb, Bi, Mg, Nb, Ta and Ti, a third infrared reflective layer such as silver, gold, platinum or mixtures thereof, third barrier layer, top dielectric layer. 9. HUD system according to claim 6, characterized in that the second coating contains the following successive layers: a main dielectric layer comprising a main dielectric bottom layer and a main dielectric top layer that has a composition different from the composition of the main dielectric bottom layer, wherein the main dielectric bottom layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio ranging from 0. 5 to 2 by weight, the main dielectric top layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range of 0.02 to 0.5 by weight, a first infrared reflective layer containing metallic silver, a first barrier layer, a central a dielectric layer comprising a central dielectric bottom layer and a central dielectric top layer, which has a composition different from the composition of the central dielectric bottom layer, which is in direct contact with the first barrier layer and contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range from 0.5 to 2, wherein the central dielectric top layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range from 0.02 to 0.5 by weight, a second infrared reflective layer containing metallic silver, a second barrier layer, top dielectric layer. 10. HUD system according to claim 9, characterized in that the second coating contains the following successive layers: a main dielectric layer comprising a main dielectric bottom layer and a main dielectric top layer, the composition of which is different from the composition of the main dielectric bottom layer, wherein the main dielectric bottom layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range of 0.5 to 2 by weight, and has a geometric thickness of 15-25 nm, the main dielectric top layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio ranging from 0.02 to 0.5 by weight, and has a geometric thickness of 5-15 nm , a first infrared reflective layer comprising metallic silver having a geometric thickness of 8-16 nm, a first barrier layer having a geometric thickness of 3-8 nm, a central dielectric layer comprising a central dielectric bottom layer and a central dielectric top layer having a composition different from composition of the central dielectric lower layer, which is in direct contact with the first barrier layer and contains a mixed oxide of Zn and Sn, having a Sn/Zn ratio in the range from 0.5 to 2, and has a geometric thickness of 58-74 nm, while the central dielectric the top layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio ranging from 0.02 to 0.5 by weight, and has a geometric thickness of 5-15 nm, the second infrared reflective layer containing metallic silver, having a geometric thickness of 8 -16 nm, a second barrier layer having a geometric thickness of 3-8 nm, a top dielectric layer having a geometric thickness of 14-22 nm, an optional surface coating having a geometric thickness of 2-8 nm. 11. HUD system according to claim 6, characterized in that the second coating contains the following successive layers: a main dielectric layer comprising a main dielectric bottom layer and a main dielectric top layer that has a composition different from the composition of the main dielectric bottom layer, wherein the main dielectric bottom layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio ranging from 0. 5 to 2 by weight, the main dielectric top layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio ranging from 0.02 to 0.5 by weight, - 28 045707 a first infrared reflective layer comprising metallic silver, a first barrier layer, a second dielectric layer comprising a second dielectric bottom layer and a second dielectric top layer that has a composition different from the composition of the second dielectric bottom layer that is in direct contact with the first barrier layer and contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range from 0.5 to 2, while the second dielectric top layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range from 0.02 to 2 0.5 by weight, a second infrared reflective layer comprising metallic silver, a second barrier layer, a third dielectric layer comprising a third dielectric bottom layer and a third dielectric top layer that has a composition different from the composition of the third dielectric bottom layer that is in direct contact with the second barrier layer and contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range from 0.5 to 2, while the third dielectric top layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range from 0 .02 to 0.5 by weight, third infrared reflective layer containing metallic silver, third barrier layer, top dielectric layer. 12. HUD system according to claim 11, characterized in that the second coating contains the following successive layers: a main dielectric layer comprising a main dielectric bottom layer and a main dielectric top layer, the composition of which is different from the composition of the main dielectric bottom layer, wherein the main dielectric bottom layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range of 0.5 to 2 by weight, and has a geometric thickness of 25-35 nm, the main dielectric top layer contains a mixed oxide of Zn and Sn having a Sn/Zn ratio ranging from 0.02 to 0.5 by weight, and has a geometric thickness of 5-15 nm , a first infrared reflective layer comprising metallic silver having a geometric thickness of 10-16 nm, a first barrier layer having a geometric thickness of 3-8 nm, a second dielectric layer comprising a second dielectric bottom layer and a second dielectric top layer which has a composition, different from the composition of the second dielectric bottom layer, which is in direct contact with the first barrier layer and contains a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range from 0.5 to 2, and has a geometric thickness of 58-74 nm, wherein a second dielectric top layer comprising a mixed oxide of Zn and Sn having a Sn/Zn ratio in the range of 0.02 to 0.5 by weight and having a geometric thickness of 5-15 nm, a second infrared reflective layer containing metallic silver having a geometric thickness a thickness of 10-17 nm, a second barrier layer having a geometric thickness of 3-8 nm, a third dielectric layer comprising a third dielectric bottom layer and a third dielectric top layer that has a composition different from the composition of the third dielectric bottom layer that is in direct contact with a second barrier layer and contains a Zn and Sn mixed oxide having a Sn/Zn ratio ranging from 0.5 to 2, and has a geometric thickness of 50-75 nm, wherein the third dielectric top layer contains a Zn and Sn mixed oxide having a ratio Sn/Zn in the range of 0.02 to 0.5 by weight, and has a geometric thickness of 5-15 nm, a third infrared reflective layer containing metallic silver having a geometric thickness of 10-16 nm, a third barrier layer having a geometric thickness 3-8 nm, top dielectric layer having a geometric thickness of 20-40 nm, optional surface coating having a geometric thickness of 2-8 nm. 13. HUD system according to any one of claims 6 to 12, characterized in that the second coating may be located on the first surface of the inner glass sheet (S3) or on the second surface of the outer glass sheet (S2). 14. A method for manufacturing a HUD system, including the steps: A. producing glazing by assembling a first or outer sheet of glass, at least one sheet of interlayer material, and a second or inner sheet of glass comprising a first coating on a second surface thereof that contains at least one high value layer refractive index having a thickness of from 50 to 100 nm, and at least one low refractive index layer having a thickness of from 70 to 160 nm, - 29 045707 wherein at least one high refractive index layer is selected from titanium zirconium mixed oxide, titanium silicon mixed oxide, niobium zirconium mixed oxide, silicon zirconium mixed nitride, zirconium oxide, indium tin mixed oxide, a mixed oxide of zinc and aluminum, a mixed oxide of antimony and tin, a mixed titanium and zinc oxide, wherein the intermediate layer provides contact between a first surface of the inner glass sheet and a second surface of the outer glass sheet, b. providing a light source capable of projecting p-polarized light, With. placing said light source such that it projects said p-polarized light towards said glazing at an incidence angle of between 42 and 72°. 15. The method according to claim 14, characterized in that the first coating is deposited on the second sheet of glass by a method selected from CVD, PECVD, PVD, magnetron sputtering, wet coating. 16. The method according to claim 14 or 15, characterized in that at least one low refractive index layer having a thickness of from 70 to 160 nm of the first coating is deposited onto the second sheet of glass using the PECVD method. 17. The use of a sheet of glass containing a first coating on one surface thereof, wherein said coating comprises at least one high refractive index layer having a thickness of from 50 to 100 nm and at least one low refractive index layer having a thickness of from 70 to 160 nm, wherein at least one high refractive index layer is selected from titanium-zirconium mixed oxide, titanium-silicon mixed oxide, niobium-zirconium mixed oxide, silicon-zirconium mixed nitride, zirconium oxide, indium tin mixed oxide, zinc aluminum mixed oxide, antimony tin mixed oxide, titanium zinc mixed oxide, in a HUD system containing a p-polarized light source that projects light onto the glazing at an incidence angle of 42 to 72° to reflect said p-polarized light.