CN117321475A - Head-up display system for vehicle glazing - Google Patents

Abstract

The invention relates to a head-up display system (100) for a vehicle glass pane (1) which in the installed state includes an outer side (I) facing the external environment (13) and an inner side (I) facing the vehicle interior space. IV), the head-up display system comprising: - at least one transparent glass plate (2, 3), - at least one masking strip (5) in the edge area (11) of the glass plate (2, 3), - At least one reflective layer (9), applied in particular by a printing method, for reflecting light, which reflective layer is arranged in the area of the masking strip (5) on the vehicle interior side of the masking strip, - at least one reflective layer (9) assigned to each The image display device (8) of the reflective layer (9) has an image display aligned with the reflective layer (9), and the projected image (14) of the image display is reflected by the reflective layer (9) to the vehicle interior space. (12), wherein the image display device (8) is curved in a horizontal direction in a top view.

Description

Heads-up display system for vehicle glass panels

Technical field

The invention relates to a head-up display system with at least one image display device for a vehicle glass panel, in particular a black print display system (Black Print Display), its manufacturing method and its application, as well as a head-up display system with a vehicle glass panel and appropriately equipped vehicles.

Background technique

Vehicles, in particular passenger cars (PKW), are increasingly equipped with so-called head-up display systems or head-up displays (HUD), such as those known, for example, from DE 10 2009 0 20824 A1. Heads-up display systems are set up to display image information to the observer or driver. By means of a projector as imager, for example in the dashboard area or in the roof area, the image is projected onto the windscreen, where it is reflected and perceived by the driver as a virtual image behind the windscreen. Important information, such as the current driving speed, navigation instructions or warnings, can therefore be projected into the driver's field of vision, which the driver can perceive without having to look away from the lane. Therefore, heads-up display systems are very helpful in improving traffic safety.

Typically, a vehicle windshield consists of two glass panes laminated to each other by at least one thermoplastic film. There is a problem in the above head-up display system that the projector image is reflected on both surfaces of the windshield. The driver therefore not only perceives the desired main image, which is caused by reflection on the interior-side surface of the windshield (main reflection). The driver also perceives a slightly offset, usually less intense, secondary image, which is caused by reflections (secondary reflections) on the outer surface of the windshield. This problem is generally solved by arranging the reflective surfaces at a specifically selected angle to each other such that the main image and the secondary image are superimposed so that the secondary image is no longer distractingly noticeable.

Vehicle glass panes, in particular windshields, often include, in addition to a transparent see-through area, an opaque masking area with an opaque layer which cannot be seen through. The masking area is usually arranged in a surrounding edge area of the windscreen and surrounds the see-through area. The opaque masking area is primarily used to protect the adhesive used to bond the windshield to the vehicle body from ultraviolet (UV) radiation. If the composite glass pane is equipped with an electrical function (eg heating function), the electrical terminals required for this can also be covered by means of a masking area. The masking area is usually formed by a black overlay print on the surface of the outer glass pane facing the interlayer.

It is also known to provide vehicle glass panes with a transparent, electrically conductive coating. These coatings can be used, for example, as infrared-reflective coatings to reduce heating of the vehicle interior and thereby increase thermal comfort, or as heatable coatings in that they are connected to a power source such that an electric current flows through the coating. layer. Windshields with a conductive coating inside the composite glass pane have the problem in connection with head-up display systems that a further reflective interface for the projector image is formed by the conductive coating. This also results in undesirable side images.

In addition, when designing a head-up display system, it is also necessary to ensure that the projector has a correspondingly large power so that the projected image has sufficient brightness and can be well recognized by the observer, especially when sunlight is incident. This requires a certain projector size and comes with a corresponding current consumption.

Current requirements can be reduced, for example, by increasing the contrast of the reflected image. Therefore, in principle, virtual images can also be generated in masked areas according to the same principles as HUDs. Therefore, the masked area is also illuminated with the projector and the light is reflected there, thereby producing a display for the driver. Thus, for example, information hitherto displayed in the dashboard area, such as the time, driving speed, engine speed or instructions for the navigation system, or rearward-oriented rear view mirrors instead of conventional exterior mirrors or rear view mirrors can be replaced. The image of the camera is displayed directly on the windscreen in a practical and aesthetic manner, for example in a section of the masking area adjoining the lower edge of the windscreen. A projection device of this type is known, for example, from DE 10 2009 020 824 A1.

Typically, a rectangular planar image display device is used to illuminate a display area in a projection device. This has the disadvantage that the contour of the projected image does not coincide with the reflective layer of the vehicle glass pane, since this reflective layer is mostly curved in the horizontal and vertical directions. This results in a locally altered projected image that appears inconsistent and uneven to the observer. For this reason, depending on the design of the system, image cropping and/or image deformation is required at the upper or lower edge of the displayed image. This in turn results in a reduction in the projected image. The reduction of the image can be compensated by an enlarged image display device with higher current consumption. However, this increases material and energy costs and increases the space requirements of the image display device.

The disadvantage of arranging a rectangular display element in the dashboard is that the outline of the projected image does not coincide with the black printed surface of the windshield, since this black printed surface is usually curved in both horizontal and vertical directions. Therefore, depending on the design of the system, image cropping and/or image deformation is required at the upper or lower edge of the displayed image.

Another disadvantage arises from the transition of multiple display elements. If rectangular display elements are combined and arranged side by side so as to amplify the projected image displayed in the black printed area from column to column, gaps inevitably occur between these display elements, although these gaps can be reduced.

An additional disadvantage of known heads-up display systems is that they are not equally visible to the driver and co-pilot.

WO2012080806A2 discloses a light source device for a vehicle.

DE 102018212046 A1 describes a method for providing a display in a motor vehicle and a display device for the motor vehicle.

EP2095988A1 discloses a head-up display system with high visibility.

WO2021209201A1 describes a projection device with p-polarized radiation for a head-up display system.

Contents of the invention

The object on which the present invention is based is to provide a head-up display system with at least one image display device, which head-up display system eliminates the known disadvantages of image inconsistencies.

According to the proposal of the present invention, this and other objects are solved by a vehicle glass pane and a head-up display system having such a vehicle glass pane and a correspondingly equipped vehicle according to the accompanying claims. Advantageous embodiments of the invention emerge from the dependent claims.

According to the invention, this object is solved in particular by a head-up display system for a vehicle glass pane which, in the installed state, has an outer side facing the external environment and an inner side facing the vehicle interior and further comprising:

- at least one transparent glass plate,

- at least one masking strip in the edge area of said glass pane,

- at least one reflective layer (especially applied by printing) for reflecting light, which reflective layer is arranged in the area of the masking strip on the vehicle interior side of the masking strip,

- at least one image display device assigned to the reflective layer, which image display device has an image display aligned with the reflective layer, the projected image of which is reflected by the reflective layer into the vehicle interior,

Wherein, the image display device is curved in a horizontal direction in a top view.

Furthermore, the head-up display system according to the invention has the advantage that it offers greater possibilities for large, seamless user interfaces displayed on a black print display system from column to column. Therefore, there are greater possibilities for projected images, especially for distances and viewing angles. The view of the user interface is relative to the driver or co-pilot seat. There are no or at least less disturbing visual gaps between the display elements. Requires less hardware. The number of display control circuit boards can be reduced. The energy consumption of the display is smaller because the display surface can be used more efficiently.

In the head-up display system according to the invention, the curvature of the image display device is adapted to the geometry of the vehicle glass pane. This means that the display curvature should correspond as precisely as possible to the horizontal curvature of the vehicle glass pane in the black printed area.

A preferred embodiment of the invention is a head-up display system in which an image from a horizontally curved image display device is reflected by a reflective layer into the vehicle interior space. This results in better viewing angles and better ergonomics. A straight and uniform upper edge of the projected image is achieved, while the lower edge of the projected image is straightened by image deformation. The curvature of the display device is adapted to the vehicle glass panel geometry. The display curvature should correspond as precisely as possible to the horizontal curvature of the windshield in the black printed area. The image display device is therefore preferably curved in such a way that the display edges further away from the vehicle glass pane have the same radius of curvature at the edges of the projected image. Changes in the curvature of the display offer additional possibilities for projected images, such as virtual image spacing or viewing angles.

A preferred embodiment of the present invention is a head-up display system, wherein the horizontally curved image display devices include 1 to 10, preferably 2 to 8, particularly preferably 3 to 6 image display devices. This range of image display device numbers has proven to be particularly advantageous. However, the gap between the projected images of the image display device can be used, for example, to separate the driver and passenger sides and a common central display, which allows for greater flexibility in display selection and integration.

A preferred embodiment of the present invention is a head-up display system, wherein the image display devices are arranged sequentially and side by side along the horizontal curvature of the vehicle glass panel, so that the distance from each image display device to the inside of the vehicle glass panel is substantially the same. The image display device is arranged horizontally with respect to the surface normal line of the vehicle floor. These image display devices are arranged side by side in a flat structure. The image display device is arranged in an arc in a horizontal plane. The image display device respectively projects an image onto different areas of the reflective layer of the vehicle glass panel.

The head-up display system or black print display system according to the invention enables it to be seen equally by the driver and co-pilot. The head-up display system according to the invention is integrated on the lower plane of the screen and makes it visible to all vehicle passengers. The head-up display system has limited or no image distortion. Only a limited number of monitors are required. Space utilization in the dashboard area is optimized. The full functionality of the image display device is achieved and interference with other vehicle systems in overcrowded areas of the instrument panel is avoided.

A preferred embodiment of the present invention is a head-up display system in which the image display device is arranged at an angle between the image display surface of the corresponding image display device and the reflective layer. The angle is chosen so that the projected image is as parallel as possible to the observer's viewing plane. The angle at which the image display device is set is selected based on the local curvature of the vehicle glass panel and the inclination of the vehicle glass panel relative to the vehicle floor. The angle of each image display device relative to the reflective layer may be different. This angle is preferably in the range of 30° to 90°.

A preferred embodiment of the invention is a head-up display system, wherein the image display device has no surrounding edge area. The resulting gaps can be further reduced if the edge areas that usually surround the image display device and are not suitable for emitting light are configured with the smallest possible width. It is particularly preferred that the image display device has no surrounding edge areas.

A preferred embodiment of the invention is a head-up display system, wherein the image display device is curved corresponding to the horizontal curvature of the vehicle glass panel in the area illuminated by the projected image. Based on the image display device adapting to the curvature of the vehicle glass pane, there is greater design freedom with respect to the generated image. Projected images can be visually perceived from more viewing directions and angles. Interfering gaps between projected images that would occur with multiple smaller image display devices can be avoided.

A preferred embodiment of the present invention is a head-up display system, wherein the amount of light emitted by the image display device is at least 50 lumens, preferably at least 200 lumens, particularly preferably at least 600 lumens. This range of light amounts is very advantageous.

A head-up display system according to the present invention includes a vehicle glass panel for separating the vehicle interior space from the vehicle exterior environment. The vehicle glass panel includes at least one transparent glass panel. The vehicle glass pane can in principle be of any desired design, in particular as a thermally prestressed single-layer safety glass or as a composite glass pane. Preferably a vehicle glass pane is used as a vehicle windshield.

A head-up display system according to the invention includes a vehicle glass pane, in particular a vehicle windshield, which is configured as a composite glass pane and includes a first glass pane with an outer side and an inner side and a second glass pane with an inner side and an outer side, said third glass pane having an inner side and an inner side. A glass pane and a second glass pane are fixedly connected to each other via at least one thermoplastic intermediate layer (adhesive layer). The first glass pane may also be called the outer glass pane and the second glass pane the inner glass pane. The surfaces or sides of two individual glass panes are often referred to as side I, side II, side III and side IV from outside to inside.

The head-up display system according to the invention includes a vehicle glass pane which, in an installed state in the vehicle, has an outer side facing the external environment and an inner side facing the vehicle interior. In a vehicle glass pane configured as a composite glass pane, the outside of the first glass pane is the outside of the vehicle glass pane and the inside of the second glass pane is the inside of the vehicle glass pane.

A head-up display system according to the invention comprises a vehicle glass pane having at least one masking strip in an edge region generally adjoining an edge of the glass pane of the glass pane. The at least one masking strip is a coating comprising one or more layers and serves to mask structures that are otherwise visible through the glass pane in the installed state. Especially in windscreens, masking strips are used to mask the adhesive strips used to bond the windscreen to the vehicle body, i.e. to prevent the often irregularly applied adhesive strips from being visible to the outside, thus creating a wind shield Harmonious overall impression of glass. Masking strips, on the other hand, serve as UV protection for the adhesive material used. Continuous UV exposure can damage the bonding material and over time can cause the glass panel to separate from the vehicle body.

The head-up display system according to the invention includes a vehicle glass pane having at least one masking strip which is configured as a frame-like surround and has a higher density in the section overlapping the reflective layer than in the remaining section. Greater width.

The at least one masking strip consists of a colored, preferably black, material which can preferably be baked into the glass pane. Preferably, the at least one masking strip is opaque in order to serve, in particular, as a sight and UV protection device for adhesive strips, for example. In glass panes with electrically controllable functional layers, masking strips can also be used, for example, to cover bus conductors and/or connecting elements.

“Transparent” in the sense of the present invention means that the total transmittance of the vehicle glass pane complies with the legal regulations for windshields and preferably has a transmittance for visible light of greater than 70% and in particular greater than 75%, such as greater than 95%. Correspondingly, "opaque" means a light transmission of less than 30%, especially less than 25%, such as less than 5%, especially 0%.

A head-up display system according to the invention includes a vehicle glass pane which further includes at least one reflective layer for reflecting light into the vehicle interior space. It is important here that the reflective layer is arranged in the area of the masking strip on the vehicle interior side of the masking strip. The reflective layer is therefore located in front of the masking strip when looking into the vehicle's glass pane.

The term "in the area of the masking strip" means that the reflective layer is arranged overlapping the masking strip in vertical line of sight through the vehicle glass pane or in orthogonal projection through the glass. The reflective layer and the at least one masking strip may be provided on different sides of the vehicle glass pane or on the same side of the vehicle glass pane. The reflective layer has no sections that do not overlap with the masking strip, ie the reflective layer is formed only at the position where it is located in front of the masking strip when looking towards the inside of the vehicle glass pane.

The term "light reflected into the vehicle interior" relates to the state of installation of the vehicle glass panel in the vehicle. The reflected light exits the vehicle glass pane on the inside of the vehicle glass pane.

In the installed state of the vehicle glass pane in the vehicle, one less image display device arranged inside the vehicle is assigned to the at least one reflective layer. The image display device includes an image display whose image strikes the reflective layer and is reflected by the reflective layer into the vehicle interior. The image display device can also be referred to as a display and is configured as a TFT display, an LED display, an OLED display, an EL display, a μLED display, etc., preferably a TFT display. Preferably at least one image display device is assigned to the reflective layer. It is particularly preferred that exactly one image display device is assigned to the reflective layer. At common sizes for image displays, when using multiple image display devices, the projected image can extend over substantially the entire width of the vehicle glass pane. This results in an improved user experience for passengers and drivers. With only one image display device, no gaps are created between projected images, which improves user experience.

The image display device should preferably have a screen diagonal of 15 cm to 30 cm, particularly preferably 20 cm to 25 cm. Larger image display devices have the advantage that a smaller number of image display devices are required, resulting in fewer visible gaps between projected projected images. Alternatively, the image display device preferably has a screen diagonal of 5 cm to 15 cm, particularly preferably 7 cm to 12 cm. The image requires less pre-deformation in a smaller image display device than in a larger image display device. That is, a smaller image display device has a smaller deviation from the horizontal radius of curvature of the vehicle glass plate.

The thickness of the image display device is preferably 0.1 cm to 5 cm, particularly preferably 0.3 cm to 1 cm. At these dimensions, the image display device can fit nicely in the dashboard of the vehicle without being easily visible to the driver or passengers.

The amount of light emitted by the image display device is at least 50 lumens, preferably at least 200 lumens, and more preferably at least 600 lumens. The brightness of the light reflected by the reflective layer of the image display device is at least 500 cd/m ² , preferably at least 800 cd/m ² , and particularly preferably 1000 cd/m ² . At this brightness, the observer can visually perceive the projected image well.

The reflective layer is configured to reflect light of the image display device. The reflective layer is a coating of the glass pane that reflects incident light, which coating preferably includes or consists of at least one elemental metal and/or at least one metal oxide. The metal is preferably selected from the group including aluminum, tin, titanium, copper, nickel chromium, cobalt, iron, manganese, zirconium, cerium, yttrium, silver, gold, platinum and palladium or mixtures thereof. Particularly preferably, the reflective layer is based on aluminum or nickel-chromium alloy. Aluminum and nickel-chromium alloys are more suitable for reflecting visible light. If something is, for example, "based on" a material, it consists largely of that material, in particular essentially except for possible impurities or dopants.

Alternatively, the reflective layer can also be a metal-containing or metal-free reflective film as well as a metal coating film. The reflective film can be applied on different sides of the vehicle glass pane by means of an adhesive layer or on a masking layer. However, it is particularly preferred that the reflective film is arranged within the thermoplastic intermediate layer. "Within the thermoplastic interlayer" can mean that the reflective layer is arranged between two thermoplastic films before lamination or is pressed into one thermoplastic film by means of pressure.

To produce the reflective layer, the paste is applied to the glass plate or film, for example by a vapor deposition method, such as an atmospheric pressure plasma coating method, spray-coating or by a sol/gel method and, if necessary, subsequent baking or annealing. superior. The paste is preferably applied to the glass plate or film by a printing method, in particular by means of screen printing, pad printing or offset printing. The applied paste is then baked, ie compressed by heat treatment. Advantageously, the applied paste is dried at a temperature of 50°C to 180°C and calcined at a temperature of 200°C to 1000°C, in particular at a temperature of 400°C to 700°C. The film is preferably a polymer film comprising polyethylene terephthalate (PET), polypropylene (PP) and/or polyethylene (PE), or the film in particular comprises PET, PP and/or PE.

The paste includes a printable metal solution in which at least one metal is primarily incorporated into a composite. The paste may also contain a solvent, preferably selected from alcohols, ethylene glycol, polypropylene glycol and derivatives thereof, and/or a thickening agent, preferably cellulose derivatives or polyacrylic acid.

To produce the reflective layer, the coating is alternatively applied to the glass plate preferably by physical vapor deposition (PVD), particularly preferably by cathode sputtering and very particularly preferably by magnetic field-supported cathode sputtering (“magnetron sputtering”) or on the membrane. Such coatings can be produced with particularly high optical quality and particularly small thicknesses.

In principle, the coating can be applied, for example, by means of chemical vapor deposition (CVD), plasma enhanced vapor deposition (PECVD), by vapor deposition or atomic layer deposition (ALD). The coating is preferably applied to the glass panel prior to lamination.

For example, the reflective layer includes at least one metal oxide, optionally at least one solvent and/or at least one thickener, and inevitable impurities. The proportion of impurities in the reflective layer is less than 5% by weight, preferably less than 1% by weight. %. The content of metal oxide in the reflective layer is preferably at least 70%, preferably at least 80%, especially at least 90%. Advantageously, the properties of the reflected light can be improved by the reflective layer compared to the mere reflection of light on the glass plate.

In an advantageous embodiment of the invention, the reflective layer has a total reflectance (R _L ) of greater than 15%, preferably greater than or equal to 25%, for light in the visible wavelength range, the reflectance being equal to the normal Measured at an incident angle of 65°. The light here preferably includes s-polarized light and p-polarized light in the visible wavelength range.

Therefore, the proportion of reflected light is relatively high, and the reflectance ( _RL ) of light is, for example, approximately 25%.

Furthermore, a relatively high proportion of light polarized in the plane of incidence (p-polarization) can also be advantageously reflected.

In a further advantageous embodiment of the invention, the reflective layer has a reflectance (R _pL ) of greater than 5%, preferably greater than 15%, for p-polarized light in the visible wavelength range, which reflectance is equal to the normal. Measured at an incident angle of 65°. The visible wavelength range within the scope of the invention is preferably 380 nm to 780 nm.

It is particularly preferred that the above-mentioned reflection values apply to s-polarized light and p-polarized light or to p-polarized light in the wavelength range used by the light source. The specification of the polarization direction refers here to the plane of incidence of the radiation on the composite glass pane. P-polarized radiation represents radiation whose electric field oscillates in the plane of incidence. S-polarized radiation represents radiation whose electric field oscillates perpendicular to the plane of incidence. The plane of incidence is formed by the incident vector and the surface normal of the composite glass plate at the geometric center of the illuminated area.

The invention is based on the recognition that a reflective layer overlapping the at least one generally opaque masking strip enables a good image display with a high contrast relative to the masking strip, so that it appears bright and is therefore also very easy to recognize. This can advantageously reduce the power of the image display device and thus reduce energy consumption. This is an important advantage of the present invention. The contrast of the projected image onto the reflective layer is at least 2:1, preferably at least 3:1 and particularly preferably at least 5:1. Contrast is the ratio between the light intensity at the brightest and darkest points of an image. The possibilities for measuring contrast are known to the skilled person.

The masking strip is preferably applied to at least one glass pane by a printing method, in particular a screen printing method. The printing ink is printed onto the glass plate and subsequently dried or baked, preferably at up to 700°C. Printing inks are preferably permanently lightfast, solvent-resistant and abrasion-resistant. Masking strips can transition from solid coating to dots of varying sizes. These so-called screen-printed dots should eliminate the visually solid impression of the black screen-printed edges.

The at least one masking strip is preferably black and may also be referred to as black print or cover print. The material of the masking strip can also be applied to the glass plate by other common application methods, such as troweling, roller coating, spraying, etc. and is then preferably baked.

According to a preferred embodiment of the vehicle glass pane, the at least one masking strip consists of a single layer. This has the advantage that the production of the vehicle glass pane is particularly simple and cost-effective, since only a single layer has to be formed for the masking strip.

The masking strip can in principle be applied to either side of the glass pane. In the case of composite glass panes, the masking strip is preferably applied on the inside of the first glass pane (side II) or on the inside of the second glass pane (side III), where it is protected from external influences. It is particularly preferred that the masking strip is applied to the inner side (side II) of the first glass pane.

According to a preferred embodiment of the vehicle glass pane according to the invention, which is configured in the form of a composite glass pane, the reflective layer is arranged on the outside (IV side) of the second glass pane, which enables particularly simple production. As the inventors can show, in this arrangement the proportion of reflected light is particularly high. Furthermore, disturbing secondary images can be avoided. Although the reflective layer is generally very weather-resistant, it can be covered by a covering layer, in particular a polymer layer or a glass layer, in order to thereby protect it from external influences. In particular, the glass layer can be applied to the composite glass pane via a thermoplastic interlayer.

According to another preferred embodiment of the vehicle glass pane according to the invention, which is configured in the form of a composite glass pane, the reflective layer is arranged on the inner side (the III side) of the second glass pane, which has the advantage that the reflective layer is protected against external influences.

According to another preferred embodiment of the vehicle glass pane according to the invention, which is configured in the form of a composite glass pane, the reflective layer is arranged on or above the (opaque) masking layer on the inner side (side II) of the first glass pane. As the invention can unexpectedly demonstrate, in this arrangement the proportion of reflected light with p-polarization is particularly high, which has the advantage that the HUD display can also be seen well with the aid of sunglasses with polarized lenses. One or more additional layers may be provided between the masking layer and the reflective layer. Alternatively, the reflective layer can be applied directly on the masking layer.

According to another preferred embodiment of the vehicle glass pane according to the invention, in addition to said (opaque) masking strip on the inside (II side) of the first glass pane, on the inside (III side) of the second glass pane ) and/or on the outside (IV) of the second glass pane at least one further masking strip is provided. The additional masking strip serves to improve the adhesion of the glass pane and is preferably added with ceramic particles which give the masking strip a rough and adhesive surface, which on the IV side supports, for example, the bonding of vehicle glass panes to in the vehicle body. On the III side, this facilitates the lamination of two single glass panes of the composite glass pane. The masking strip preferably arranged on side II is also filled with ceramic particles. Additional masking strips applied to the outside (IV side) of the second glass pane can also be provided for aesthetic reasons, for example in order to mask the edges of the reflective layer or the edges forming the transition to the transparent area.

In a section in which the reflective layer and the opaque masking strip are arranged one above the other on the second side, the masking strip is preferably provided with a widening, ie having a greater width than in the other sections. (dimension perpendicular to extension). In this way, the masking strip can be suitably adapted to the dimensions of the reflective layer.

The vehicle glass pane preferably has an upper edge facing the roof of the vehicle in the installed position (also referred to as roof edge) and a lower edge facing toward the bottom of the vehicle (also referred to as engine edge). The upper edge and the lower edge are connected to each other by two side edges extending essentially perpendicularly to the upper edge and the lower edge.

In a preferred embodiment of the invention, the reflective layer extends over the entire width of the vehicle glass pane. The reflective layer extends completely from one side edge to the other. The reflective layer is arranged in the lower edge section directly adjacent to the lower edge. The width of the reflective layer is preferably 2 cm to 20 cm, particularly preferably 3 cm to 15 cm. In this embodiment, the vehicle glass pane is preferably a windshield of a motor vehicle. The reflective layer is here arranged outside the area of the windshield provided for see-through. On the EU market this means that the reflective layer is placed under the windscreen's fields of view A and B according to ECE-R43. Important information can therefore be projected into the driver's field of vision, such as the current driving speed, navigation instructions or warning prompts, which the driver can perceive without having to look away from the lane. The reflective layer can also be used as part of a head-up display system to free up space in the vehicle by replacing the function of the same type of display that takes up space in the dashboard.

The at least one glass pane preferably contains or consists of glass, particularly preferably flat glass, float glass, quartz glass, borosilicate glass, soda-lime glass, aluminosilicate glass or a transparent plastic, preferably a rigid transparent plastic, in particular a polyethylene glass. Composed of ethylene, polypropylene, polycarbonate, polymethyl methacrylate, polystyrene, polyamide, polyester, polyvinyl chloride and/or mixtures thereof. Suitable glasses are known, for example, from EP 0847965 B1.

The at least one glass pane may be transparent, or may be painted or dyed. The windshield must have sufficient light transmission in the central viewing area according to ECE-R43, preferably at least 70% in the main see-through area A. The at least one glass pane is preferably curved, ie it has a curvature.

The at least one glass pane can have other suitable coatings known per se, such as anti-reflective coatings, anti-stick coatings, anti-scratch coatings, photocatalytic coatings or sun protection coatings or low-emissivity coatings.

The thickness of a glass pane can vary widely and can be adjusted to the requirements of the specific situation. It is preferred to use glass plates with a standard thickness of 1.0 mm to 25 mm, preferably 1.4 mm to 2.1 mm. The dimensions of the glass sheets can vary widely and depend on the application.

Vehicle glass panels can have any three-dimensional shape. Preferably, the at least one glass pane has no shadow areas so that it can be coated by cathode sputtering, for example. The at least one glass pane is preferably flat or slightly or strongly curved in one or more directions in space. The at least one glass pane may be colorless or tinted.

The at least one thermoplastic intermediate layer contains or consists of at least one thermoplastic, preferably polyvinyl butyral (PVB), ethylene vinyl acetate (EVA) and/or polyurethane (PU) or copolymers or derivatives thereof , optionally combined with polyethylene terephthalate (PET). However, the thermoplastic intermediate layer can also contain, for example, polypropylene (PP), polyacrylates, polyethylene (PE), polycarbonate (PC), polymethacrylates, polyvinyl chloride, polyacetate resins, casting resins, acrylic resins ester, fluorinated ethylene-propylene, polyvinyl fluoride and/or ethylene-tetrafluoroethylene or copolymers or mixtures thereof.

The thermoplastic intermediate layer preferably contains or preferably consists of polyvinyl butyral (PVB), particularly preferably polyvinyl butyral (PVB), and additives known to the skilled person, such as plasticizers. The thermoplastic intermediate layer preferably contains at least one plasticizer.

Plasticizers are chemical compounds that make plastic softer, more flexible, pliable and/or more elastic. They shift the thermoelastic range of the plastic to lower temperatures, giving the plastic the desired more elastic properties over the range of service temperatures. Preferred plasticizers are carboxylic esters, especially the less volatile carboxylic esters, fats, oils, soft resins and camphor. Other plasticizers are preferably aliphatic diesters of triethylene glycol or tetraethylene glycol. Particular preference is given to using 3G7, 3G8 or 4G7 as plasticizers, where the first digit represents the number of ethylene glycol units and the last digit represents the number of carbon atoms in the carboxylic acid part of the compound. For example, 3G8 represents triethylene glycol bis(2-ethylhexanoate), which is the formula C ₄ H ₉ CH(CH ₂ CH ₃ )CO(OCH ₂ CH ₂ ) ₃ O ₂ CCH(CH ₂ CH ₃ )C ₄ H ₉ compounds.

Preferably the thermoplastic intermediate layer contains at least 3% by weight, preferably at least 5% by weight, particularly preferably at least 20% by weight, still more preferably at least 30% by weight and especially at least 40% by weight of plasticizer. The plasticizer preferably contains or consists of triethylene glycol bis(2-ethylhexanoate).

It is further preferred that the thermoplastic intermediate layer contains at least 60% by weight, particularly preferably at least 70% by weight, especially at least 90% by weight and for example at least 97% by weight of polyvinyl butyral.

The thermoplastic intermediate layer may be formed from a single film or may be formed from more than one film.

The thermoplastic intermediate layer may be formed from one or more thermoplastic films stacked on top of each other. The thickness of the thermoplastic intermediate layer is preferably 0.25 mm to 1 mm, usually 0.38 mm or 0.76 mm. However, it is also conceivable that in the case of transparent adhesives the thickness is approximately 10 μm.

The thermoplastic interlayer can also be a functional thermoplastic interlayer, in particular an interlayer having acoustic damping properties, an interlayer reflecting infrared radiation, an interlayer absorbing infrared radiation and/or an interlayer absorbing UV radiation. Therefore, the thermoplastic intermediate layer may also be a bandpass filter film that hides a narrow band of visible light.

The head-up display system includes an image display device assigned to the reflective layer, the image display device having an image display aligned with the reflective layer, the image of the image display being reflected by the reflective layer into the vehicle interior. If multiple reflective layers are provided, a corresponding number of image display devices can be provided.

Furthermore, the invention relates to a vehicle having a head-up display system according to the invention. The image display device is preferably powered via the vehicle's onboard electrical system. The current for the onboard electrical system can be generated, for example, by solar cells on the roof of the vehicle.

The invention also relates to a method for manufacturing a head-up display system according to the invention. The method includes:

(a) applying at least one masking strip in the edge region of at least one glass pane,

(b) disposing a reflective layer on the vehicle interior space side in the area of the masking strip, and

(c) Arrange the image display device and its geometry relative to the vehicle glass panel.

The masking strip is preferably applied to the at least one glass plate by a printing method, in particular a screen printing method or by other customary application methods, such as troweling, roller coating, spray coating, etc. and is then preferably baked. The reflective layer is preferably applied to the glass plate by a printing method and baked.

To produce composite glass panes, at least two glass panes are connected (laminated) to one another, preferably by at least one thermoplastic adhesive layer under the influence of heat, vacuum and/or pressure. Methods known per se for producing composite glass panes can be used. For example, the so-called autoclave process can be carried out at an elevated pressure of about 10 bar to 15 bar and a temperature of 130°C to 145°C for about 2 hours. The vacuum bag method or vacuum ring method known per se operates, for example, at approximately 200 mbar and 130°C to 145°C. The two glass panes and the thermoplastic interlayer can also be pressed into a composite glass pane in a calender between at least one roller pair. Equipment of this type is known for the production of composite glass panes and usually has at least one heating channel before the press. The temperature during the pressing process is, for example, 40°C to 150°C. The combination of the calender method and the autoclave method has proven to be particularly useful in practice. Alternatively, a vacuum laminator can be used. They consist of one or more heatable and evacuable chambers in which a first glass plate and a second glass plate can be exposed to a reduced pressure of 0.01 mbar to 800 mbar and 80° C. to 170° C. in, for example, about 60 minutes. laminated at temperatures.

Furthermore, the invention relates to the use of a head-up display system according to the invention with a vehicle glass pane in a transport vehicle, in particular a motor vehicle, for land, air or water transport. According to the invention, a vehicle glass pane is preferably used as a vehicle windshield.

Advantageously, the composite glass pane may be a windscreen or sunroof glass of a vehicle or other vehicle-mounted glazing, such as a dividing glass pane in a vehicle, preferably a rail vehicle or a bus. In principle, the composite glass pane having the characteristics of a vehicle glass pane can also be an architectural glass pane, for example in the facade of a building or a dividing glass pane in the interior of a building.

The different embodiments of the invention can be implemented individually or in any combination. In particular, the features mentioned above and to be explained below can be used not only in the combination specified but also in other combinations or alone without departing from the scope of the invention.

Description of drawings

The present invention will be explained in detail below with reference to the accompanying drawings and examples. A simplified, not to scale illustration follows:

Figure 1 shows a cross-sectional view of an embodiment of a head-up display system according to the invention;

Figure 2 shows a top view of the vehicle glass panel of Figure 1;

Figures 3-4 show cross-sectional views of different embodiments of vehicle glass panels;

Figure 5A shows a cross-sectional view of the heads-up display system of Figure 5;

Figure 5 shows another variant of a head-up display system, in which a top view of an arrangement system of image display devices is shown;

Figure 6A shows a cross-sectional view of the heads-up display system of Figure 6;

FIG. 6 shows another preferred variant of a head-up display system, in which a top view of the arrangement of the image display device is shown; and

FIG. 7 shows another preferred variant of a head-up display system, in which a top view of the arrangement of the image display device is shown.

Detailed ways

Figure 1 shows a cross-sectional view of an embodiment of a head-up display system 100 according to the invention in a vehicle in a highly simplified schematic diagram. A top view of the vehicle glass pane 1 of the head-up display system 100 is shown in FIG. 2 . The cross-sectional view of FIG. 1 corresponds to the section line A-A of the vehicle glass pane 1 as shown in FIG. 2 .

The vehicle glass pane 1 is configured in the form of a composite glass pane (see also FIGS. 3 to 4 ) and includes a first glass pane 2 (for example an outer glass pane) and a second glass pane 3 (for example an inner glass pane), said first glass pane being The plate and the second glass plate are firmly connected to each other via a thermoplastic intermediate layer 4 . The vehicle glass pane 1 is installed into the vehicle and separates the vehicle interior 12 from the external environment 13 . The vehicle glass pane 1 is, for example, a windshield of a motor vehicle. Alternatively, the vehicle glazing has only a single pane of glass, preferably in the form of thermally prestressed single pane safety glass (not shown).

The first glass pane 2 and the second glass pane 3 are each made of glass, preferably thermally prestressed soda-lime glass, and are transparent to visible light. The thermoplastic intermediate layer 4 is made of a thermoplastic, preferably polyvinyl butyral (PVB), ethylene vinyl acetate (EVA) and/or polyethylene terephthalate (PET).

The outer surface I of the first glass pane 2 faces the external environment 13 and is at the same time the outer surface of the vehicle glass pane 1 . The inner surface II of the first glass plate 2 and the outer surface III of the second glass plate 3 face the intermediate layer 4 respectively. The inner surface IV of the second glass pane 3 faces the vehicle interior 12 and is at the same time the inner surface of the vehicle glass pane 1 . It goes without saying that the vehicle glass pane 1 can have any suitable geometry and/or curvature. As a vehicle glass pane 1, it usually has a convex curvature.

In the edge region 11 of the vehicle glass pane 1 , a frame-like circumferential first masking strip 5 is located on the inner side (second side) of the first glass pane 2 . The first masking strip 5 is opaque and prevents structures arranged on the inside of the vehicle glass pane 1 from being visible, such as adhesive tapes for bonding the vehicle glass pane 1 into the vehicle body. The first masking strip 5 is preferably black. The first masking strip 5 is made of a non-conductive material commonly used for masking strips, such as baked screen printing ink dyed black.

Furthermore, the vehicle glass pane 1 has a second masking strip 6 made of an electrically non-conductive material in the edge region 11 on the outer side IV of the second glass pane 3 . The second shielding strip 6 is configured as a frame-like surround. Similar to the first masking strip 5, the second masking strip 6 is made of a non-conductive material commonly used for masking strips, such as baked screen printing ink dyed black.

On the outer side IV of the second glass pane 3 there is a reflective layer 9 which is applied to the glass pane 3 by printing, for example by means of magnetron sputtering or as a paste and baked. The reflective layer is a metal oxide coating containing at least one metal oxide or, for example, a nichrome alloy.

The reflective layer 9 is arranged to overlap the first masking strip 5 in a vertical line of sight through the vehicle glass panel 1 . The first masking strip 5 completely covers the reflective layer 9 , that is, the reflective layer 9 has no area that does not overlap with the first masking strip 5 . part. The reflective layer 9 is here provided, for example, only in the lower (engine-side) section 11 ′ of the edge region 11 of the vehicle glass pane 1 . However, the reflective layer 9 can also be arranged in the upper (top-side) section 11 ″ or in the side sections of the edge region 11 . Furthermore, a plurality of reflective layers 9 can be provided, which are arranged, for example, in the edge region 11 in the lower (engine side) section 11' and in the upper (top side) section 11". For example, these reflective layers 9 can be arranged in such a way that a (partially) surrounding image is produced.

The first masking strip 5 is wider in the lower (engine-side) section 11 ′ of the edge region 11 , ie the first masking strip 5 is wider in the lower (engine-side) section 11 ′ of the edge region 11 than in the vehicle glass pane 1 There is a greater width in the upper (top side) section 11 ″ of the edge region 11 (as well as in the side sections of the edge region 11 not visible in FIG. 1 ). “Width” is understood to mean the first masking strip 5 perpendicular to its extension. The reflective layer 9 is here, for example, disposed above the second masking strip 6 (that is, does not overlap), and overlap may also exist for aesthetic reasons.

The head-up display system 100 also has an image display device 8 arranged in the instrument panel 7 as an imager. The image display device 8 serves to generate light 10 (image information), which light is directed at the reflective layer 9 and is reflected by the reflective layer 9 as reflected light 10' into the vehicle interior 12, where it can be viewed by an observer, such as the driver. See. The reflective layer 9 is configured to reflect light of the image display device, ie, the image of the image display. For example, the image display device 8 can also be arranged in the A-pillar or on top of the motor vehicle (respectively on the vehicle interior side), if the reflective layer 9 is positioned in a suitable manner for this purpose. If multiple reflective layers 9 are provided, an individual image display device 8 can be assigned to each reflective layer 9 , that is, multiple image display devices 8 can be provided. For example, the vehicle glass panel 1 may also be a sunroof glass, a side window glass or a rear window glass. The vertical distance between the respective image display device 8 and the area of the reflective layer 9 provided to reflect the light 10 of the image display device 8 is preferably, independently of each other, 0.1 cm to 10 cm, such as 2 cm. The image display device 8 is, for example, a TFT display and the amount of light emitted by each image display device 8 is, for example, 600 lumens. Image display device 8 is electrically connected, for example, to the vehicle electrical system and is supplied with power therefrom (not shown).

If more than one projection image 14 is to be displayed on the reflective layer 9 , these projection images can also be generated by more than one image display device 8 . For example, the vehicle glass panel 1 may also be a sunroof glass, a side window glass or a rear window glass. The vertical distance from the image display device 8 to the area of the reflective layer 9 , which is configured to reflect the light 10 of the image display device 8 , is preferably 0.1 to 10 cm, such as 2 cm. The image display device 8 is, for example, a TFT display and the amount of light emitted is, for example, 600 lumens. Image display device 8 is electrically connected, for example, to the vehicle electrical system and is supplied with power therefrom (not shown). Embodiments according to the invention of one or more image display devices 8 are described in FIGS. 5 , 6 and 7 .

The top view of FIG. 2 shows the reflective layer 9 extending along the lower section 11 ′ of the edge region 11 .

Reference is now made to Figures 3 to 4, in which cross-sectional views of different embodiments of a vehicle glass pane 1 are shown. The cross-sectional views of FIGS. 3 to 4 correspond to section line A-A in the lower section 11 ′ of the edge region 11 of the vehicle glass pane 1 as shown in FIG. 2 .

In the variant of the vehicle glass pane 1 shown in FIG. 3 , a first (opaque) masking strip 5 is located on the inside (second side) of the first glass pane 2 . A reflective layer 9 is applied to the outside (IV side) of the second glass pane 3 . Light 10 from the image display device 8 is reflected by the reflective layer 9 into the vehicle interior space 12 as reflected light 10'. The polarization (s-polarization, p-polarization) of the light 10, 10' is schematically shown. The advantage of this variant is that a relatively large proportion of the incident light 10 is reflected. Furthermore, the image can be easily recognized with high contrast in front of the background of the opaque (first) masking layer 5 .

The variant of the vehicle glass pane 1 shown in FIG. 4 differs from the variant of FIG. 3 only in that the reflective layer 9 is applied to the (first) masking layer 5 . A special advantage of this variant is that a relatively large proportion of the p-polarization of the incident light 10 is reflected. Furthermore, the image can be easily recognized with high contrast in front of the background of the opaque (first) masking layer 5 . The reflective layer 9 is well protected from external influences inside the composite glass pane.

In all embodiments, the reflective layer 9 is arranged on the vehicle interior space side of the first masking strip 5 , that is, the reflective layer 9 is located in front of the first masking strip 5 when looking at the inside of the vehicle glass panel 1 .

FIG. 5 shows a top view of the arrangement system of the image display device 8 in front of the vehicle glass panel 1 of the head-up display system 100 . The vehicle glass pane 1 is designed, for example, as described in FIG. 1 . The vehicle glass pane 1 has, for example, the usual geometry and curvature for windshields. The vehicle glass pane 1 separates the vehicle interior 12 from the external environment 13 . The vehicle glass panel 1 is installed in a vehicle as a windshield, for example.

The head-up display system 100 may comprise image display devices 8 _n which each project an image 14 _n onto the reflective _layer 9 of the vehicle glass pane 1 . The arrangement system of the image display device 8 _n is located in the vehicle interior space 12 and includes, for example, a first image display device 8 ₁ , a second image display device 8 ₂ , a third image display device 8 ₃ , a fourth image display device 8 ₄ , A fifth image display device 8 ₅ , a sixth image display device 8 ₆ and a seventh image display device 8 ₇ . The seven image display devices 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 ₆ , 8 ₇ of the arrangement system 8 are shaped like a rectangle, but may have any other shape. The image display devices 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 ₆ , 8 ₇ are arranged sequentially and side by side along the horizontal curvature of the vehicle glass panel 1 such that each image display device 8 ₁ , 8 ₂ , 8 ₃ The distances from , 8 ₄ , 8 ₅ , 8 ₆ , and 8 ₇ to the inside of the vehicle glass panel (outside IV) are basically the same. The image display devices 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 ₆ , 8 ₇ are arranged horizontally with respect to the surface normal of the vehicle floor and each project an image onto the reflective layer 9 of the vehicle glass pane 1 on different areas. The image display devices 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 ₆ and 8 ₇ are arranged side by side in a flat structure. The image display devices 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 ₆ , 8 ₇ are arranged in an arc shape in the horizontal plane.

FIG. 5A is a cross-sectional view of the vehicle glass panel 1 and the fourth image display device ₈₄ as shown on section line AA' in FIG. 5 . The fourth image display device 8 ₄ is arranged horizontally with respect to the surface normal of the vehicle floor and emits visible light 10 onto the reflective layer 9 of the vehicle glass pane 1 . The light 10 is reflected on the reflective layer 9 in the direction of the eyes of the observer 15 . The reflected light 10' can thus be visually perceived by the observer 15 as a projected image 14. For simplicity, the projected image 14 is shown in FIG. 5A behind the vehicle glass pane 1 , although the light 10 is actually reflected at the reflective layer 9 into the vehicle interior 12 .

The arrangement system of the image display device 8 makes it possible to generate a plurality of different projected images 14 over a large area of the vehicle glass pane 1 . The image V can thus be visually perceived by multiple occupants of the vehicle. The projected image 14 may, for example, convey information that is usually displayed in the instrument panel in the form of displays of the same type, such as a speed display, a fuel tank display or an engine speed display. Therefore, the arrangement system using the image display device 8 reduces the space requirements in the vehicle. The projected image 14 appears in the field of view of the observer 15 in an inclined plane in front of the vehicle glass pane 1 . This oblique plane of the projected image 14 is here the viewing plane E perpendicular to the viewing direction of the observer 15 .

The variant of the head-up display system 100 shown in FIG. 6 differs from the variant of FIG. 5 only in that the seven image display devices 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 of the system 8 are arranged. ₆ , 8 ₇ are arranged at a specific angle γ relative to the reflective layer 9 . What is meant here is that the image display surface (main surface H) of the corresponding image display device 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 ₆ , 8 ₇ is moved relative to the reflective layer 9 by the corresponding image display device 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 ₆ , 8 ₇ The angle γ at the geometric center of the area illuminated. FIG. 6A is a cross-sectional view of the vehicle glass panel 1 and the fourth image display device ₈₄ as shown on section line AA' in FIG. 6 .

In FIGS. 6 and 6A , the angle γ of the respective image display device 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 ₆ , 8 ₇ relative to the reflective layer 9 is selected such that the projected image 14 is as parallel as possible to the viewing angle. Or 15's viewing plane E. The angle γ set by the image display devices 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 ₆ , 8 ₇ is selected based on the local curvature of the vehicle glass panel 1 and the inclination of the vehicle glass panel 1 relative to the vehicle floor. The angle γ of each of the seven image display devices 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 ₆ , 8 ₇ relative to the reflective layer may be different.

The head-up display system 100 shown in FIGS. 6 and 6A can on the one hand optimize the dimensions used for the image display devices 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 ₆ , 8 ₇ and thereby reduce costs and Structural space in the dashboard. On the other hand, the gaps between the projected images 14 and therefore the visual gaps in the user interface are reduced by the tilting of the seven image display devices 8 _{1 ,} 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 _{6 ,} 8 7 . Furthermore, the corresponding projected image 14 appears clearer and free of distortion to the observer 15 . The gaps that occur are also formed if the edge areas that are generally surrounding the image display device 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 ₆ , 8 ₇ and are not suitable for emitting light 10 are configured with the smallest possible width. can be further reduced. It is particularly preferred that the image display devices 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 ₆ , 8 ₇ have no surrounding edge areas.

FIG. 7 shows a top view of an arrangement system 8 of six image display devices 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 ₆ which are arranged side by side in front of the vehicle glass panel 1 . The image display devices 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 ₆ are rectangular in shape and are arranged along the vehicle glass pane 1 . In a top view, the image display devices 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , and 8 ₆ do not form the image display devices 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , and 8 ₆ that are side by side with each other. straight lines instead produce curves. The resulting bend is, for example, asymmetrical. All image display devices are arranged as described for FIGS. 6 and 6A with a specific angle γ of the main surface H relative to the reflective layer 9 of the vehicle glass pane 1 . The areas 16 between the individual image display devices 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 ₆ are triangular in shape and have acute angles. This means that the rear corners of the image display devices 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 ₆ contact the adjacent image display devices 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 The rear corners of the image display devices 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , and 8 ₆ do not contact the adjacent image display devices 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , and _{8 5} , 8 ₆ . The “rear corners” in plan view refer to the two corners of the image display device 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 ₆ which are located further away from the vehicle glass panel 1 . It goes without saying that the "front corners" are the two corners of the image display devices 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 ₆ which are arranged closer to the vehicle glass panel 1 .

The acute angle faces the vehicle glass pane 1 and is of different sizes for all areas 16 . The acute angle β between the first image display device 8 ₁ and the second image display device 8 ₂ is, for example, between 3.5° and 5°. In this example, the acute angle increases with distance from the first image display device ₈₁ . The acute angle ω between the fifth image display device ₈₅ and the sixth image display device ₈₆ is, for example, 5° and 8.5°. By adjusting the acute angles between the image display devices 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , and 8 ₆ , the projected image 14 is reflected toward the observer 15 in a straight manner, so that the projected image can be visually better. The ground is perceived. Therefore, less optical correction is required for the virtual image 14 projected onto the vehicle glass pane 1 . The observer 15 sits closer to the first and second image display devices 8 1 , 8 ₂ than to the remaining image display devices _{8 3} , 8 ₄ , 8 ₅ , 8 ₆ .

“Optical correction” of the projected image 14 means that the image display device 8 optically adjusts the displayed image according to the geometric design of the vehicle glass pane 1 , the position of the observer 15 relative to the projected image 14 and the position of the image display device 8 relative to the vehicle glass pane 1 of the projected image 14 to prevent or at least reduce geometric imaging errors on the vehicle glass panel 1 . However, this optical correction causes the projected image 14 to shrink; therefore, it is advantageous to reduce the optical correction to as small a degree as possible.

Depending on the curvature of the vehicle glass pane 1 and the orientation of the image display device 8 , the acute angle can also be the same everywhere between the image display devices 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 ₆ , starting from the first image display device 8 ₁ to the sixth image display device 8 ₆ become smaller or have different ratios to each other. This additionally depends on the position from which the projected image 14 should be visually perceptible to the observer 15 .

The regions 16 located between the image display devices 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ , 8 ₅ , 8 ₆ can also be configured in the form of a trapezoid, the length of the longer base of the trapezoidal region being able to vary.

From the above description, the present invention provides an improved vehicle glass panel or a head-up display system equipped with the vehicle glass panel, which enables good image display with high contrast relative to the masking strip. Undesirable secondary images can be avoided. The head-up display system according to the invention can be manufactured simply and cost-effectively using known manufacturing methods.

List of reference signs

1 vehicle glass panel

2 first glass plate

3 second glass plate

4 middle layers

5 first masking strip

6 second masking strip

7Dashboard

8Image display device

8 ₁ First image display device

8 ₂ Second image display device

8 ₃ Third image display device

8 ₄ Fourth image display device

8 ₅ fifth image display device

8 ₆ Sixth Image Display Device

8 _7Seventh Image Display Device

9 reflective layers

10, 10' light

11, 11', 11"' edge area

12Vehicle interior space

13External environment

14 projected images

15 observers

16The area between two image display devices

100 heads-up display system

I, II the outside of the first glass plate 2, the inside of the first glass plate 2

III, IV The inside of the second glass plate 3 and the outside of the second glass plate 3

An integer from n1 to 10

γThe angle between the main surface H and the reflective layer 9

βThe angle between the first and second image display devices 8 ₁ , 8 ₂

ωAngle between fifth and sixth image display devices 8 ₅ , 8 ₆

E view plane

H image display surface, main surface

A-A' section line

Claims (21)

1. Head-up display system (100) for a vehicle glass pane (1) comprising an outer side (I) facing the external environment (13) and an inner side (IV) facing the vehicle interior space in the installed state, The head-up display system includes: - at least one transparent glass plate (2, 3), - at least one masking strip (5) in the edge area (11) of the glass panes (2, 3), - at least one reflective layer (9), applied in particular by a printing method, for reflecting light, which reflective layer is arranged in the area of the masking strip (5) on the vehicle interior side of the masking strip, - at least one image display device (8) assigned to the reflective layer (9), having an image display aligned with the reflective layer (9) and whose projected image (14) is reflected by the reflective layer (9) ) is reflected into the vehicle interior space (12), Wherein, the image display device (8) is curved in the horizontal direction in a top view. 2. Head-up display system (100) according to claim 1, wherein the horizontally curved image display device (8) contains 1 to 10, preferably 2 to 8, particularly preferably 3 to 6 image display devices (8 _n ) and n represents an integer from 1 to 10. 3. The head-up display system (100) according to claim 1 or 2, wherein the image display devices ( _8n ) are arranged in a horizontal plane sequentially and side by side along the horizontal curvature of the vehicle glass panel. 4. The head-up display system (100) according to any one of claims 1 to 3, wherein the image display device ( _8n ) is configured with an image display surface (H) on the corresponding image display device ( _8n ) An angle γ is set with the reflective layer (9). 5. Head-up display system (100) according to claim 4, wherein said angle γ is different for each image display device ( _8n ) and said angle γ preferably lies in the range of 30° to 90° . 6. Head-up display system (100) according to any one of claims 1 to 5, wherein the image (14) from the horizontally curved image display device (8) is reflected by the reflective layer (9) into the vehicle interior space (12) in. 7. Head-up display system (100) according to any one of claims 1 to 6, wherein the image display device (8) has no surrounding edge areas unsuitable for emitting light. 8. The head-up display system (100) according to any one of claims 1 to 7, wherein the image display device (8) corresponds to the vehicle glass panel (1) illuminated by the projected image (14). The levels in the area are curved and curved. 9. The head-up display system (100) according to any one of claims 1 to 8, wherein the amount of light emitted by the image display device (8) is at least 50 lumens, preferably at least 200 lumens, particularly preferably at least 600 lumens. 10. The head-up display system (100) according to any one of claims 1 to 9, wherein the image display device (8) is an LED display, an OLED display or a μLED display. 11. Head-up display system (100) according to any one of claims 1 to 10, wherein the vehicle glass pane (1) has at least one masking strip (5) configured as a frame-shaped surround. and in particular has a greater width in the section (11') that overlaps the reflective layer (9) than in the section (11") that is different from this section. 12. Head-up display system (100) according to any one of claims 1 to 11, wherein the vehicle glass pane (1) has a reflective layer (9) containing at least one elemental metal or metallic An oxide, the elemental metal or metal oxide being selected from the group consisting of aluminum, tin, titanium, copper, nickel, chromium, cobalt, iron, manganese, zirconium, cerium, yttrium, silver, gold, platinum and palladium or mixtures thereof . 13. The head-up display system (100) according to any one of claims 1 to 12, wherein the reflective layer (9) has a light absorption rate of greater than 5%, preferably greater than 5%, for p-polarized light in the visible wavelength range. 15% reflectivity measured at an angle of incidence of 65° from the normal. 14. Head-up display system (100) according to any one of claims 1 to 13, wherein the reflective layer (9) is applied as a paste to the glass plate (2, 3) or film by a printing method served and baked. 15. A head-up display system (100) according to any one of claims 1 to 14, wherein the projected image (14) is displayed from column to column. 16. The head-up display system (100) according to any one of claims 1 to 15, wherein the horizontally curved image display device (8) includes 2 to 8, preferably 3 to 6 image display devices ( _8n ), n is an integer from 2 to 8, the image display device ( _8n ) is configured in a rectangular shape and is arranged along the vehicle glass panel (1), and the rear corner of the image display device ( _8n ) contacts the adjacent The rear corner of the image display device (8 _n ), while the front corner of the image display device (8 _n ) does not contact the adjacent image display device (8 _n ), the rear corner refers to the image display device (8 _{n )} in a top view ) is located further away from the vehicle glass panel (1). 17. Head-up display system (100) according to claim 16, wherein the area (16) between the individual image display devices ( _8n ) is triangular in shape and has an acute angle which faces the vehicle glass pane (1 ) and are of different sizes for all regions (16). 18. Head-up display system (100) according to any one of claims 1 to 17, wherein the vehicle glass pane (1) is constructed in the form of a composite glass pane and includes a first glass pane (2) and a third glass pane. Two glass panes (3), the first glass pane having an outer side (I) facing the external environment (13) in the installed state and an inner side (II), the second glass pane having an inner side (II) facing the vehicle interior in the installed state. On the inner side (III) and with the outer side (IV) of the space (12), the first and second glass plates are fixedly connected to each other by at least one thermoplastic intermediate layer (4), and the masking strip (5) is applied on On the inner side (II) of the first glass plate (2). 19. Method for manufacturing the head-up display system (100) according to any one of claims 1 to 18, wherein (a) applying at least one masking strip (5) in the edge region (11) of at least one glass pane (2, 3), (b) disposing the reflective layer (9) on the vehicle interior space side in the area of the masking strip (5), and (c) The image display device (8) is arranged relative to the vehicle glass panel (1) and its geometry. 20. Method for manufacturing a head-up display system (100) according to claim 19, wherein the reflective layer (9) is applied as a paste to the glass plate (2, 3) or film by a printing method Serve and bake. 21. Use of a head-up display system (100) according to any one of claims 1 to 18 in a vehicle for land, air or water transport, in particular as a vehicle windshield.