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Title:
GLAZING PANE
Document Type and Number:
WIPO Patent Application WO/2024/120938
Kind Code:
A1
Abstract:
The invention relates to a glazing pane separating an interior space from an exterior environment comprising a reflective film having a ramp profile, to a HUD system comprising said glazing pane and to the use of a ramp profile on a glazing pane.

Inventors:
LALOYAUX XAVIER (BE)
Application Number:
PCT/EP2023/083619
Publication Date:
June 13, 2024
Filing Date:
November 29, 2023
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
AGC GLASS EUROPE (BE)
International Classes:
B32B3/08; B32B17/10; B60K35/00; G02B27/01
Domestic Patent References:
WO2022266477A12022-12-22
WO2022073860A12022-04-14
Foreign References:
US20220334300A12022-10-20
US20090295681A12009-12-03
US5598175A1997-01-28
Attorney, Agent or Firm:
AGC GLASS EUROPE (BE)
Download PDF:
Claims:
Claims A glazing pane separating an interior space from an exterior environment, having one inner surface facing the interior space and one outer surface facing the exterior environment, wherein the inner surface is provided in at least one area with a reflective film having a perimeter, characterised in that the reflective film has a ramp profile along at least a portion of its perimeter. A glazing pane according to claim 1 , wherein the reflective film is selected from films comprising at least one transparent liquid crystal layer; films comprising at least one cholesteric liquid crystal layers; films comprising a plurality of alternating polymeric interference layers, and the like. A glazing pane according to any one of the preceding claim, wherein the ramp profile is selected from polyethylene terephthalate (PET), polyurethane resin, polyethylene, polypropylene, polystyrene, polyvinyl chloride (PVC), acrylonitrile butadiene-styrene (ABS), thermoplastic elastomers (TPEs), polyisobutylene, silicone, acrylic resin, cyano-acrylate, epoxy resin, polyamide, ethylene-vinyl acetate, polysulfide, butyl rubber, ethylenepropylene copolymer, styrene-butadiene rubber and mixtures or combinations thereof. A glazing pane according to any one of the preceding claim, wherein the glazing pane is selected from single sheet of glass or polymer, or may be a laminated pane of glass and/or polymeric material. A glazing pane according to claim 4, wherein the glazing pane is a laminated glazing pane comprising at least two glass sheets and at least one interlayer. A glazing pane according to any one of the preceding claim further comprising an IR reflective coating. A glazing pane according to any one of the preceding claim, wherein the at least one area provided with the reflective film has a light transmittance > 60% (III. A, 2°). A glazing pane according to any one of the preceding claim, wherein the at least one area provided with the reflective film has a light transmittance < 30% (III. A, 2°). A glazing pane according to claim 8, wherein the area having a TL < 30% is provided with an opacifying means, including a dark print, a dark insert, a dark patch, or combinations thereof. A HUD system comprising the glazing pane of anyone of claims 1 to 9, and at least one projector emitting radiation, wherein the area of the glazing pane provided with the reflective film is a display area for an image projected by the at least one projector. The HUD system of claim 10, wherein the radiation emitted from the projector is 50 to 100% p-polarized light. The HUD system of claim 10 or 11 , wherein the radiation emitted from the projector strikes the display area provided with the reflective film, at an angle of incidence of 50° to 75°. Use of a ramp profile on glazing pane according to anyone of claims 1 to 9, to secure fastening of at least a portion of the perimeter of a reflective film affixed on the inner surface of a glazing pane separating an interior space from an exterior environment, said glazing pane having one inner surface facing the interior space and one outer surface facing the exterior environment, and said ramp profile being positioned along at least a portion of the reflective film perimeter.
Description:
Glazing pane

FIELD OF THE INVENTION _

[0001] The invention relates to a glazing pane separating an interior space from an exterior environment comprising a reflective film having a ramp profile, to a HUD system comprising said glazing pane and to the use of a ramp profile on a glazing pane.

BACKGROUND OF THE INVENTION _

[0002] Glazing panes suitable for reflection of projected images are ever more gaining in performance and application fields, in at least transportation applications, specifically when HUD functionality is required.

[0003] The technology of reflective coatings obtained by deposition of metallic and/or dielectric layers by chemical vapor deposition or physical vapor deposition on glass or plastic substrates, leads to a variety of reflection performance above 10 % of reflection of p-polarized light, for example at Brewster angle. These coatings may be applied on a surface glazing pane or within a glazing pane, specifically a laminated glazing pane. These coatings are well known to the skilled person, and have definitive advantages of quality, ease of processability and performance, with mainly only a disadvantage of cost. When only an area of the surface of the glazing pane requires a reflective coating, either the deposition of the coating may be selective in said area, or a complete deposited coating may be decoated (removed). Both operations involve wasted materials, process complexity and increased costs.

[0004] The technology of reflective films also leads to good reflection performance on glazing panes. Again, these reflective films are known to the skilled person. These films, although having a performance of reflection of p-polarized light above 15 % at Brewster angle, remain difficult to affix to the surface of glazing panes.

[0005] The reflective films may be applied within a glazing pane, when such a pane is a laminated glazing pane. Indeed, in these circumstances, the reflective film may be inserted withing the laminating thermoplastic material. These conditions lead to some drawbacks of double images or optical defects due to waviness or wrinkles in the film, or to difficulties related to the smooth stretching and position, and to the shaping of the laminated pane (bending and forming).

[0006] In other circumstances, the reflective films may be affixed on the inner surface of the glazing pane. These conditions lead to similar drawbacks. When the reflective film is affixed on the entirety of the surface of the glazing pane, wrinkles, waviness and shaping issues may lead to inaesthetic appearance. However when the film is affixed only in a partial area of the full surface of the glazing pane, cost and waviness/wrinkles drawbacks are reduced, but the edges of the area may be visible, which in addition to being inaesthetic, may also lead to dirt capture, to unsecured adhesion such that it can be damaged, scratched and/or removed.

SUMMARY OF THE INVENTION _

[0007] The present invention is intended to overcome the above drawbacks by providing a glazing pane separating an interior space from an exterior environment, having one inner surface facing the interior space and one outer surface facing the exterior environment, wherein the inner surface is provided in at least one area with a reflective film having a perimeter, characterised in that the reflective film has a ramp profile along at least a portion of its perimeter. The reflective film itself provides for high reflectivity of p-polarized radiation, be it projected from a p-polarized light source or from a mixed light source, and allows for a color-neutral display.

[0008] The particular ramp profile, by masking the extremity of the film, assists in providing for an effective positioning but also in reducing edges defects that lead to dirt capture and/or adhesion issues of the edge of the reflective film.

BRIEF DESCRIPTION OF THE DRAWINGS _

[0009] FIG. 1 is a schematic view of the ramp profile of the present invention.

[0010] FIG. 2 is a schematic view of a first embodiment of the present invention. [0011] FIG. 3 is a schematic view of a second embodiment of the present invention. [0012] FIG. 4a and 4b are schematic views of a third embodiment of the present invention, side-view and see-through view respectively.

[0013] FIG. 5a and 5b are schematic views of a fourth embodiment of the present invention, side-view and see-through view respectively.

[0014] The figures are not to scale.

DETAILED DESCRIPTION _

[0015] The present glazing pane is thus used to define an inner space from an external environment. The inner space may be a room or defined space, having to be separated from the external environment. In preferred embodiments, the inner space is the interior of a vehicle.

[0016] The inner surface of the glazing pane is thus the surface facing the inner space, while the outer surface is facing the external environment.

[0017] The glazing pane may be a single sheet of glass or polymer, or may be a laminated pane of glass and/or polymeric material.

[0018] Examples of glass sheets include float glass panes or alternatively cast or drawn glass panes and can be chosen among all glass technologies such as: float clear, extra-clear or colored glass, (partially) acid etched or (partially) sand blasted glass and combinations thereof. It may be of any composition having any optical properties, e.g., any value of visible transmission, ultraviolet transmission, infrared transmission, and/or total solar energy transmission. The glass may be a soda-lime- silicate glass, an alumino-silicate glass, an alkali-free glass, a boro-silicate glass and the like. The glass may be regular a clear, colored or extra-clear (i.e. lower Fe content and higher transmittance) glass substrate. Further examples of glass substrates include clear, green, bronze, or blue-green glass substrates.

[0019] Examples of polymeric material sheets include poly(methyl meth)acrylate (PMMA), polycarbonates, polyethyleneterephthalate (PET), polyolefins, polyvinyl chloride (PVC), or mixtures thereof.

[0020] Preferred glazing panes are glass panes, useful in the provision of vehicle glazing in general.

[0021] The glass may be clear, extra-clear, or colored. These glass types are defined by their respective compositions. Said compositions may be selected from the various types of glass compositions, provided the invention is not jeopardized.

[0022] The glass may be annealed, tempered or heat strengthened glass.

[0023] Preferably, when the glazing pane is a laminated pane, it may comprise at least two glass sheets and at least one intermediate layer or interlayer.

[0024] The interlayer, or intermediate layer or laminating material, may be selected from the group consisting of ethylene vinyl acetate (EVA), polyisobutylene (PIB), polyacetals such as polyvinyl butyral (PVB), polyurethane (PU), polyvinyl chloride (PVC), polyesters, cyclo olefin polymers (COP), ionomers and/or ultraviolet curable adhesives, and others known in the art of manufacturing glass laminates. Blended materials using any compatible combination of these materials can be suitable as well. Preferably, the interlayer comprises a material selected from the group consisting of ethylene vinyl acetate and/or polyvinyl butyral.

[0025] The interlayer acts as a “bonding interlayer” since the interlayer and the glass sheets form a bond that results in adhesion between the glass sheets and the interlayer.

[0026] The interlayer to be used in the present invention may be a transparent or translucent polymer interlayer. However, for specific applications where transparency is not a requirement, the polymer interlayer may be colored or patterned. Colored interlayers may have a light transmittance of from 0 to 85%, and may be selected according to the requirements of the area used as projection area in the HUD system. [0027] Typical thicknesses for the interlayer are 0.15 mm to 3.5 mm, preferably 0.30 mm to 1.75 mm, more preferably from 0.5 mm to 1.75 mm. Usual commercially available polymer films are polyvinyl butyral (PVB) layers of 0.38 mm and 0.76mm, 1.52 mm, 2.28 mm and 3.04 mm. To achieve the desired thickness, one or more of those films can be used.

[0028] Reinforced acoustic insulation can be provided by using a specific interlayer, known in the field of laminated glazings.

[0029] The interlayer may have an essentially constant thickness, apart from any surface roughness that is customary in the art, or it may be a so-called wedge film, and thus have a varying thickness across its surface.

[0030] When considering a laminated glazing pane comprising two glass sheets, the first and second sheets may independently have a thickness ranging from 0.2 mm to about 15 mm, alternatively from 0.5 mm to about 10 mm, alternatively from 0.5 mm to about 8 mm, alternatively from 0.5 mm to about 6 mm. Specifically, in the automotive field, the first and second sheets may independently have a thickness ranging from 0.2 mm to 6 mm, alternatively from 0.4 to 3 mm.

[0031] Both sheets may have the same thickness, for example 0.5 mm, or 0.8 mm, or 1 .2 mm, or 1 .6 mm, or 1 .8 mm or 2.1 mm, or 3 mm. Such symmetrical construction in glass thickness allows for ease of process and conventional sizing of the laminating process.

[0032] Both sheets may also have different thicknesses, providing for asymmetrical laminated glazings, irrespective of the position towards interior or exterior, for example pane 1 = 0.5 mm and pane 2 = 2.1 mm, or pane 1 = 0.8 mm and pane 2 = 2.1 mm, or pane 1 = 0.5 mm and pane 2 = 1.6 mm, pane 1 = 0.8 mm and pane 2 = 1.6 mm, or pane 1 = 1.6 mm and pane 2 = 2.1 mm. Such asymmetrical constructions in glass thickness allow for flexibility in curvature, and/or in weight management and/or flexibility in light/solar modulation.

[0033] In specific instances, it may be suitable to have an asymmetrical laminated glazing having the exterior sheet having a greater thickness than the interior sheet, for example: exterior pane = 2.1 mm and interior pane = 0.5 mm, such that a compromise may be concluded between lighter weight and better mechanical resistance.

[0034] The present reflective film is suitable for reflecting p-polarized radiation, at an angle of 50 to 75° incident angle, or at an angle of 55 to 70°, that is, at an angle range including the Brewster angle (57°). However, the present invention may also be suitable for reflective films aimed at reflecting mixed reflection (s-polarized and p- polarized) or s-polarized reflection with the appropriate projector.

[0035] Such reflective film is specifically designed to reflect p-polarized radiation in view of reflecting a projected image in a HUD system.

[0036] In general, clear glass pane have a reflectance for p-polarized light (Rppol) of 1 % at an angle of 65°, and reflectance for p-polarized light (Rppol) of 0% at an angle of 57° (Brewster), and a reflectance for s-polarized light (Rspol) = 35% at an angle of 65°.

[0037] The preferred reflective film typically has a reflection for p-polarized light > 18%, preferably > 20% at Brewster angle.

[0038] Suitable preferred reflective film may have a reflectance for p-polarized light (Rppol) of 26% at an angle of 65°; and a reflectance for s-polarized light (Rspol) = 40% at an angle of 65°.

[0039] The reflective film is preferably provided in a defined area of the inner surface of the glazing pane, said defined area being defined according to the potential display area which will be targeted by the projector of the potential HUD. The defined area may thus have any surface area dimension, as from 2 cm 2 , alternatively 4 cm 2 , alternatively 8 cm 2 , alternatively 10 cm 2 . The defined area may be up to 4 m 2 , alternatively up to 2.5 m 2 , alternatively up to 1 m 2 , alternatively up to 0.5 m 2

[0040] The area of the glazing pane onto which the reflective film may be affixed, may have any value of light transmittance, with TL as typically measured according to IS09050, with llluminant A, at an observer opening slit angle of 2° (= III. A, 2°).

[0041] The perimeter of the reflective film may have n edges, with n > 1 , to define either a circle, an oval, a triangle, a square, a rectangle, a trapeze, or any other suitable shape.

[0042] Examples of reflective films include films comprising at least one transparent liquid crystal layer; films comprising at least one cholesteric liquid crystal layers; films comprising a plurality of alternating polymeric interference layers, and the like. [0043] Such layers and coatings, also called p-pol reflective films, are known. If other I ight/radiation is to be reflected, films may be chosen appropriately for s-polarized light or mixed polarized light.

[0044] The reflective film may be applied to the surface side of the glazing pane facing towards the vehicle interior.

[0045] For example, a reflective film comprising liquid crystal layers can be bonded to the surface of the glazing pane as a functional foil. In this case, corresponding liquid crystal layers are applied as a coating, for example, to carrier foils made of cellulose triacetate (TAC), polyethylene terephthalate (PET), polyethylene (PE), polyamide (PA) or other conventional polymeric materials. High precision coating processes for the manufacture of such functional liquid crystal films are available and known in the art and the functional films are commercially available. Advantageously, the foils can be applied at any time to the surface of a glazing pane facing the interior, which surface is intended to serve as a projection surface.

[0046] Commercial examples of such reflective films include the Windshield Combiner Film available from 3M under the tradename 3M® WCF-PVB, or the reflective films available from Toray under the tradename PICASUS®VT, or the reflective films available from Fujifilm under the tradename Wavista®.

[0047] The reflective film may have a light transmittance > 60% or even > 70%, when it requires application in a transparent zone of a glazing pane, which may be used as a vehicle windshield. However, the advantage of the present technical solution is that the reflective film may have any light transmittance, from 0 to 92%, when the reflective film is to be affixed on an obscurated zone of a glazing pane, said obscurated zone having a TL < 30%.

[0048] The reflective film may be applied to the glazing pane using any known adhesion means, such optical clear resins and the like.

[0049] Suitable optical clear resins have a refractive index about 1.4-1 .6. Examples of optical clear resins include acrylic resin, methacrylate resin, urethane resin, silicone resin, polyester resin, epoxy resin and polysulfide resin.

[0050] Such optical clear resin is for example thermal cure type, high elongation silicone gel. The optical clear resin preferably cures at lower temperature than 70°C during a period of 25 to 30 minutes to a soft, tacky gel. Optical clear resin may also be pressure sensitive adhesives, or any curable resin.

[0051] Application of such optical clear resins is well known in the art. [0052] The transparency of the optical clear resin is > 90%, preferably > 95%, more preferably 99%. Thus, the glazing plane transmittance may be maintained, if so required.

[0053] In first instances, the at least one area provided with the reflective film may have an initial light transmittance > 60% (III. A, 2°), that is, the reflective film may be affixed on a transparent area of the glazing pane, that is, an area of the glazing pane having a TL > 60%, preferably > 70%, before the reflective film may be affixed. This has the advantage that the display area may be in the sight line of the observer to whom the projected information is intended. The advantage is that the observer then sees the projected image in the overlapping area of the sight out of the glazing pane. In such first instances, the reflective film may thus preferably have high transmittance in the visible spectral range and allow a color-neutral display, specifically if the reflective film is positioned in the area if the glazing pane having a TL > 60%.

[0054] In the field of automotive and specifically windshields, norm ECE-R43 specifies the technical requirements that the central field of view of an automobile must have a high light transmission (typically greater than 70%). In such first instances, the reflective film must thus satisfy the conditions of transparency according to norm ECE- R43.

[0055] In second instances, the at least one area provided with the reflective film may have an initial light transmittance < 30% (III. A, 2°), that is, the reflective film may be affixed on a non-transparent area of the glazing pane, that is, an area of the glazing pane having a TL < 30%, preferably < 15%, before the reflective film may be affixed. In these instances, the advantage is that the projected image is out of sight of the viewing area of the observer. The quality and color of the reflective film may then be adapted and require less technical and chemical constraints in terms of transparency and color neutrality. On the other hand, the reflective film is thus also invisible or unnoticeable from the outside of the glazing pane. Further, reflectivity of an image from an area having a darker background is typically brighter. An additional advantage is that the reflective film is protected against direct sun lights and that risks of damage or scratches is reduced since the obscurated area is generally on the glazing pane periphery and less reachable by driver or vehicle occupants.

[0056] Examples of opacifying means providing a glazing pane with a TL < 30% include a dark print, a dark insert, a dark patch, or combinations thereof.

[0057] Dark prints include enamels and paints, applied by screen printing or typical methods to deposit enamels and paints. Dark inserts include colored interlayers, inserted within the interlayer used to provide for a laminated glazing pane, or between the reflective film and the interior surface of the glazing pane, where it may serve as adhesion means for the reflective film. Dark patches may be provided by a glass piece laminated to the glazing pane using an interlayer such as those described above, either one of the interlayer or glass piece or their combination, having a TL < 30%.

[0058] It may also be that the reflective films overlaps both the areas of the glazing pane having a TL > 60% and having a TL < 30%, bridging an area of the glazing pane having two different light transmittance.

[0059] In both first and second instances, alone or combined, however, the reflective film must be smooth and flat. The present ramp profile has the advantage of smoothing the edge(s) of the perimeter even more, such that the inner side of the glazing pane does not have an inaesthetic appearance of the reflective film and such that dust does not remain stuck on the edge(s) of the reflective film. Further, the reflective film cannot easily be removed by mechanical (such as scratching) or cleaning actions.

[0060] The ramp profile is provided along a portion of at least one edge of the perimeter of the reflective film. In some embodiments, the ramp profile is provided over an upper portion of at least one edge of the perimeter of the reflective film, or on a portion of an upper edge of the perimeter of the reflective film.

[0061] Typically, the glazing pane may be inserted within a frame by a fastening means, such as a sealant, to attach the glazing pane to the interior space.

[0062] In some embodiments, at least a first portion of the perimeter will be apparent to the inside view, while a second portion may be hidden within the car body or side of the glazing pane within the fastening element (as illustrated by Figure 4).

[0063] In other embodiments, the ramp profile can be part of the dashboard, said dashboard being designed such that it comprises an opening comprising the reflective film affixed on the glazing pane, such that projection on a selected area of the windshield may occur. In such instances, no portion of the perimeter is effectively apparent to the inside view, as being hidden within the dashboard design covering around the perimeter (as illustrated by Figure 5).

[0064] In some other embodiments, a ramp profile is provided along all the edge(s) of the perimeter of the reflective film. The final aesthetics and positioning will determine the portion of the perimeter to be provided with the ramp profile.

[0065] The ramp profile, as represented in Figure 1 , comprises at least a notch, with a thickness (t) corresponding to the thickness of the reflective film ranging 0.01 to 1 .00 mm, alternatively of from 0.02 to 0.25 mm.

[0066] The ramp profile, as represented in Figure 1 , further comprises a width (w) and height (h) independently ranging from 0.4 to 30.0 mm, alternatively of from 1 .0 to 20.0 mm.

[0067] In Figure 1 , the ramp profile is exemplified having a round (semi-circular) crosssection, but technically, any other cross-section may be presented, as best fits design and technical requirements. There are various options of protruding or smooth designs, provided the ramp profile serves the function of hiding a portion of at least one edge of the perimeter of the reflective film.

[0068] The ramp profile may be made in polymer, preferably in thermoplastic polymer or thermoplastic elastomer, such as processed by extrusion or injection molding. Both methods allow for the production of continuous and uniform shapes fitting the required design. The ramp profile may be clear or transparent, or colored, as typically acknowledged for these types of materials.

[0069] Examples of such materials include polyethylene terephthalate (PET), polyurethane resin, polyethylene, polypropylene, polystyrene, polyvinyl chloride (PVC), acrylonitrile butadiene-styrene (ABS), thermoplastic elastomers (TPEs), polyisobutylene, silicone, acrylic resin, cyano-acrylate, epoxy resin, polyamide, ethylene-vinyl acetate, polysulfide, butyl rubber, ethylene-propylene copolymer, styrene-butadiene rubber and mixtures or combinations thereof. These materials may be from biological origin (bio-based), recycled origin or chemical origin.

[0070] In some instances, the ramp profile may thus be an optical clear resin, specifically when the ramp profile is to be visible to the occupant. This has the advantage of being less disturbing to the view and aesthetically pleasing on the surface of the glazing pane.

[0071] In other instances, when the ramp profile is an element of the dashboard, it may be of the same color and material of said dashboard, and thus be colored and non-transparent (such as typical AVO materials). This has the advantage that the element is structurally and aesthetically pleasing to the view as being an element of the interior design.

[0072] The ramp profile may be self-adhesive, or it may be affixed to the glazing pane via a separate adhesive, or via a primer. The adhesive may also be transparent, as will be required by the design. [0073] Examples of adhesives include cyanoacrylate, epoxy resin, silicone adhesives, and mixtures or combinations thereof. These have the advantage of being transparent, temperature resistant, waterproof and having high strength.

[0074] The ramp profile may be opaque, colored or transparent, or translucent.

[0075] The present glazing pane may further comprise an IR reflective coating. In such instances, compatible with the present invention, the glazing pane is a laminated glazing pane comprising two glass sheets and at least one interlayer. The IR reflective coating may be present between the two glass sheets, either on the surface of at least one glass sheets, where it may be provided by chemical vapor deposition or physical vapor deposition on the glass sheet surface known as P2 or P3, or within the interlayer joining the two glass sheets, such as a PET-based solar control window film with infrared absorbing or reflecting ceramic coatings. Such IR reflective coatings are well known in the field to provide for sun control and/or heating functionality to the glazing pane.

[0076] In some instances, the IR reflective coating may be removed for use of IR- cameras or optical systems, such as LIDARS or else, distinct from the present HUD projector.

[0077] In order to avoid double images from said IR reflective coating, it may be useful to avoid overlap of the IR reflective coating with the reflective film for the head up display.

[0078] Specifically, the glazing pane may be provided with an IR reflective coating in an area of the glazing pane having a TL > 70%, and the reflective film may be provided in an area of the glazing pane having a TL < 30%. In such way, the TTS (total transmission solar) may be optimized with values of less than 60% , alternatively less than 55%, while not compromising the functioning of the reflective film for polarized light as discussed above. In such instances, the edge of the IR reflective coating may be hidden by the ramp profile, so as to avoid any visible change in aesthetics between the area provided with the IR reflective coating and the area free of said IR reflective coating (said coating may be decoated).

[0079] Laminated panes can be produced by methods known per se. Typically, the outer pane, the inner pane and the layers of the intermediate layer are stacked flat on top of each other. The surface of the outer pane facing the interlayer or the surface of the outer pane facing the interlayer may be entirely or partially provided with an IR reflective coating as discussed above. In some instances, the IR reflective coating is present within the interlayer. The reflective film may be positioned and arranged on the surface of the inner pane opposite the interlayer, facing the interior of the vehicle (known as surface P4 in a laminated glazing).

[0080] The outer pane and the inner pane are laminated to one another via the interlayer, for example by autoclave processes, vacuum bag processes, vacuum ring processes, calendering processes, vacuum laminators or combinations thereof. The outer pane and inner pane are usually connected under the action of heat, vacuum and/or pressure.

[0081] The present glazing pane may be used as windshield, roof, cockpit, sidelight, backlight, among other vehicle applications, or curtain wall, window, door shop displays, fridge door, and the like for architectural applications.

[0082] Vehicles include land vehicle, sea vehicle, air vehicle or spacecraft.

[0083] The present invention also relates to a HUD system comprising the glazing pane described herein, and at least one projector emitting radiation, wherein the area of the inner pane provided with the reflective film is a display area for an image projected by the at least one projector.

[0084] In such HUD system, the projector is oriented towards the HUD region, such that the projected image is reflected within the display area. The projector thus illuminates an area of the windshield where the radiation is reflected towards the viewer (driver), creating an image or a virtual image that the viewer sees behind the windshield as seen from inside (see-trough view). The area of the windshield that can be irradiated by the projector may be referred to as the HUD area.

[0085] Such projectors are typically known in the art and will not be described herein. [0086] Typically, current HUD projectors operate predominantly with s-polarized radiation and illuminate the windshield at an angle of incidence of approximately 65°. The problem arises that the projector image is reflected on both external surfaces of the windshield (known as the air/glass interfaces of P1 and P4). As a result, in addition to the desired main image, a slightly offset secondary image also appears, the so- called ghost image (“ghost”). Different means may be used to alleviate this issue, such as wedge interlayers, or reflective films. Another means to alleviate this issue is to reduce the transmitted radiation towards the external glass sheets, by having an HUD area having a TL < 30%.

[0087] In the scope of the present invention, the radiation beam from the projector may be 20 to 100% p-polarized light. The image formed by the projected beam of the HUD projector may thus be comprised of mixed light polarization wherein the percentage of p-polarized light is at least 20%, preferably at least 50%, more preferably at least 75%, even more preferably at least 90%, most preferably 100%.

[0088] As a result, the radiation provided by the projector can be advantageously reflected by the reflective film, specifically when the TL of the HUD area is > 70%. There is less criticality in the proportion of non p-polarized light when the HUD area is in area of the glazing pane having a TL < 30%, since the projected image will not be transmitted or reflected through the external air-glass surface. One additional advantage of working with a p-polarized beam is the compatibility of the image or virtual image with polarized sunglasses.

[0089] The radiation from the projector strikes the display area provided with the reflective film, at an angle of incidence of 50 to 75° incident angle.

[0090] The present invention last relates to the use of a ramp profile to secure fastening of at least a portion of the perimeter of a reflective film affixed on the inner surface of a glazing pane separating an interior space from an exterior environment, said glazing pane having one inner surface facing the interior space and one outer surface facing the exterior environment, and said ramp profile being positioned along at least a portion of the reflective film perimeter.

[0091] The present invention is illustrated by the below embodiments, compatible with one another.

[0092] Figure 2 shows a cross section of a glazing pane (201 ), comprising an inner surface (202) and a reflective film (203), having 4 edges affixed on said inner surface. The reflective film perimeter has 4 edges: the lower edge (203L), an upper edge (203U); and a right edge and a left edge (not shown). The area of the glazing pane (201 ) provided with the reflective film (203) in Figure 2 has a TL > 70%. A ramp profile (204L) is affixed on the lower edge (203L) and a ramp profile (204U) is affixed on the upper edge (203U). A ramp profile may also be present on each of the right and left edges (not shown).

[0093] Figure 3 shows a cross section of a glazing pane (301 ) similar to Figure 2, comprising an inner surface (302) and a reflective film (303), wherein a delimited zone of an obscurated area of the glazing pane (301 ), said obscurated area having a TL < 30%, is provided with said reflective film (303). Said area is provided with an obscuration means (305) such as discussed above, for example enamel or paint. The said area may be the blackband area or any obscurated area of the glazing pane. A ramp profile (304L) is affixed on the lower edge (303L) and a ramp profile (30411) is affixed on the upper edge (30311). A ramp profile may also be present on each of the right and left edges (not shown).

[0094] Figure 4 shows a cross section of a glazing pane (401 ), which is a laminated glazing pane, composed of two glass sheets (411 and 412) and one interlayer (413), having an inner surface (402) - contact between the elements is implied although not drawn for the sake of clarity. Again, a delimited zone of an obscurated area of the glazing pane (401 ), said obscurated area having a TL < 30%, is provided with the reflective film (403). Said area is provided with an obscuration means (405) such as discussed above, for example enamel or paint or dark interlayer, here in position 2 of the laminated glazing pane. The reflective film perimeter has 4 edges: the lower edge (403L), an upper edge (403LI); and a right edge and a left edge (not shown). A ramp profile (404LI) is affixed on the upper edge (403LI), while the car body (405) is hiding and covering the lower edge (403L). A ramp profile may be provided on each of the sections of right and left edges not hidden in the car body (not shown). In this particular case, an IR reflective coating (414) may be provided within the interlayer (413) of deposited on either one of the surfaces of the sheets (411 ) and (412) facing the interlayer. It may also be appropriate, such as illustrated, that the IR reflective coating (414) does not overlap with the reflective film (403), and that the bottom edge of the IR reflective coating (414) is hidden by the ramp profile.

[0095] Figure 4b shows a front projection of the glazing pane with the reflective film (403), in the line of view of the obscuration band (405), as seen from the perspective of the occupant (see-through perspective). The reflective film is affixed and positioned on the glazing pane (501 ), such that projection and reflection may occur on the obscuration band region of the windshield. The bottom portion of the perimeter of the reflective film is hidden by the car body (405) while a ramp profile of thermoplastic material is provided on the upper edge, being transparent to the view, such that only the appearance of the obscuration band is noticed by the occupant (404LI preferably being transparent).

[0096] Figure 5a shows a cross section of a glazing pane (501 ), which is a laminated glazing pane, composed of two glass sheets (511 and 512) and one interlayer (513), having an inner surface (502) - contact between the elements is implied although not drawn for the sake of clarity. Again, a delimited zone of an obscurated area of the glazing pane (501 ), said obscurated area having a TL < 30%, is provided with the reflective film (503). Said area is provided with an obscuration means (505) such as discussed above, for example enamel or paint or dark interlayer, here in position 2 of the laminated glazing pane. The reflective film perimeter has 4 edges: the lower edge (503L), an upper edge (50311); and a right edge and a left edge (not shown). A ramp profile (506U and 506L) is affixed along all the edges of the reflective film perimeter, in the form of a part of the dashboard. An IR reflective coating (514) may be provided within the interlayer (513) of deposited on either one of the surfaces of the sheets (511 ) and (512) facing the interlayer. It may also be appropriate, such as illustrated, that the IR reflective coating (514) does not overlap with the reflective film (503), and that the bottom edge of the IR reflective coating (514) is hidden by the ramp profile designed in the dashboard structure.

[0097] Figure 5b shows a front projection of the glazing pane with the dashboard being designed such that it comprises an opening comprising the reflective film (503), in the line of view of the obscuration band (505), as seen from the perspective of the occupant (see-through perspective). The reflective film is affixed and positioned on the glazing pane (501 ), such that projection and reflection may occur on the obscuration band region of the windshield. The entire portion of the perimeter of the reflective film is effectively hidden to the inside view, as being hidden within the dashboard design covering around the perimeter.