System and method for providing visual content in a vehicle

Abstract

The invention relates to a system (10) and a method for providing visual content (32) in a vehicle (12), in particular visual content (32) that can be seen from inside or outside the vehicle (12). The system (10) comprises at least one projection unit (52), at least one image surface (30) on a vehicle window (16), a projection film (124) applied to or in the vehicle window (16), which is designed as a switchable film and can be operated at least in an opaque mode and in a transparent mode, and a control unit (70) having at least one projector controller (94) and a projection film controller (96). The projection unit (52) projects visual content (32) onto an inner side (114) of the vehicle window (16). The projection film (124) functions as a rear projection film in the opaque mode, with the transparency being lower in the opaque mode than the transparency in the transparent mode. The projector controller (94) is functionally coupled to the projection unit (52) in order to project the visual content (32) onto the projection film (124). The projection film controller (96) is functionally coupled to the projection film (124) in order to apply a control voltage to the projection film (124).

Description

System and method for providing visual content to a vehicle

[0001] The present disclosure relates to a system and method for providing visual content in a vehicle. In particular, the present disclosure relates to a system and method for displaying visual content perceivable outside or inside the vehicle.

[0002] In principle, the visual content can be entertainment, news, advertising, information, (disaster) warnings, and the like. The visual content can also be traffic-related content, such as traffic jam reports, hazard alerts, information on parking space availability, information on the planned parking duration, and the like. The visual content can also be vehicle-specific content, such as information on the charge level, a welcome function (greeting the driver), a coming-home function (farewell to the driver), and the like. If the vehicle is intended for temporary use (taxi, rental vehicle, car-sharing vehicle, etc.), the visual content can also be information on availability and the like. The visual content can also include a combination of different content.

[0003] DE 202 12462 U1 discloses a system for projecting images, graphics, and text installed in a vehicle, with visibility from the outside, for example, via the vehicle's rear window. A roller blind that can be extended in front of the rear window inside the vehicle serves as the projection surface. FR 2 824 172 A1 discloses a system for displaying information in the rear window of a vehicle, using an active liquid crystal film suitable for color display as the display.

[0004] US 2019 / 0098268 A1 discloses a mobile projection system comprising a hermetically sealed unit mounted on the ceiling in the interior of a vehicle, with projection occurring, for example, in the vehicle's side windows. US 2019 / 0098268 A1 further describes embedding the mobile projection system in a client-server environment, with content to be displayed being provided via a server.

[0005] In urban environments, for example, vehicles parked in public spaces are generally visible to a majority or large number of pedestrians and other road users. Vehicles are used for advertising purposes, for example, by applying (static) advertising messages or other content to the vehicle body and then making them visible to pedestrians and other road users. The content is visible even when the vehicle is moving. However, the content is static (static images, no video, no possibility of dynamic control). Furthermore, such advertising media sometimes have acceptance issues among passersby and users due to their permanent presence (in the case of rental vehicles, car sharing, and similar services).

[0006] Parked vehicles can be used to display visual content in an expanded way, insofar as the vehicle's windows are generally available for display when parked. For reasons of road safety, the vehicle windows of a moving vehicle should be at least sufficiently transparent. However, since vehicles are often stationary in urban environments, parked vehicles can generally be used for the aforementioned purposes. However, this should be possible without adversely affecting road safety while the vehicle is moving.

[0007] Against this background, the object underlying the present disclosure is to provide a system and a method for providing visual content in a vehicle, in particular visual content perceptible from outside or inside the vehicle via its vehicle windows, wherein the system addresses passers-by with the displayable visual content when the vehicle is stationary and attracts attention. When the vehicle is moving, the system should be as unobtrusive as possible and, in particular, have no adverse impact on road safety in the vehicle. The system should allow the display of dynamic content. The system should ensure good visibility of the visual content even under unfavorable ambient conditions (for example, direct sunlight with high brightness, operation at dusk or at night).The system should be particularly suitable for displaying interactive content, for example, when observed by passersby using their mobile devices (e.g., smartphones). Furthermore, the system should allow dynamic control of the displayed content.

[0008] The present disclosure relates, according to a first aspect, to a system for providing visual content in a vehicle, in particular Visual content perceivable from outside or inside the vehicle via its vehicle windows, the system comprising: at least one projection unit, at least one image surface on a vehicle window, the projection unit being configured to project visual content onto an inner side of the vehicle window, a projection film mounted on or in the vehicle window, which is designed as a switchable film and is operable in at least an opaque mode and a transparent mode, the projection film serving as a rear projection film in opaque mode, the transparency of which in opaque mode is lower than the transparency in transparent mode, a control device comprising at least a projector control and a projection film control, the projector control being functionally coupled to the projection unit in order to project the visual content onto the projection film,and wherein the projection film control is functionally coupled to the projection film to apply a control voltage to the projection film.,

[0009] According to a further aspect, the present disclosure relates to a method for providing visual content in a vehicle, in particular visual content perceivable from outside or inside the vehicle via its vehicle windows, comprising the following steps: Providing a vehicle window with a projection film mounted thereon or therein, which is designed as a switchable film and is operable in at least one opaque mode and one transparent mode, wherein the projection film in the opaque mode serves as a rear projection film, the transparency of which in the opaque mode is lower than the transparency in the transparent mode, Providing a projection unit for projecting visual content onto an image surface on the inside of the vehicle window, Providing a control device comprising at least a projector control and a projection screen control, Controlling the projection screen with the projection screen control to operate the projection screen in opaque mode, and Operating the projection unit with the projector control to display visual content on a screen on an inside of the vehicle window, comprising projecting the visual content onto the projection film with the projection unit.

[0010] This allows the vehicle windshield to operate in a highly transparent mode (transparency mode), which is particularly suitable for ferry operations. This ensures high transparency while the vehicle is moving, ensuring road safety. Conversely, when the vehicle is stationary (parked), a display is easily visible to passersby on the screen, generated by rear projection from the vehicle's interior. The projection screen can therefore be switched between opaque and transparent mode.

[0011] In one exemplary embodiment, the projection screen is actively supplied with a control voltage to operate the projection screen in opaque mode. This applies, for example, to TPDLC screens. When no control voltage is applied, the TPDLC screens are transparent.

[0012] In another exemplary embodiment, the projection screen is actively subjected to a control voltage to operate the projection screen in transparent mode. Otherwise, an opaque mode is used. This applies, for example, to PDLC screens. Both modes (with or without voltage applied) can be initiated by the control device.

[0013] If, in the context of this disclosure, it is mentioned that a film is applied to the vehicle window, this includes films that are applied to a applied to a glass substrate, and films that are otherwise integrated or even embedded into a pane.

[0014] The vehicle can generally be a passenger car. Vehicles are typically used to transport people and / or goods. The term vehicle generally refers to land vehicles, watercraft, and aircraft. Land vehicles include, for example, road vehicles and rail vehicles. Watercraft include ships. Aircraft include airplanes, helicopters, balloons, and airships. Vehicles are used, for example, for individual motorized transport, such as private cars or the like. Rental vehicles, car sharing vehicles, and taxis also generally fall under individual motorized transport. Vehicles can have a human driver / operator, but there are also autonomously controlled vehicles. Vehicles can also be vehicles for public or private (non-individual) transport; this generally includes the categories of land vehicles, watercraft, and aircraft.Typical land vehicles for non-individual transport are buses and trains. Typical watercraft for non-individual transport are ferries. Typical aircraft for non-individual transport are commercial aircraft.

[0015] The present disclosure primarily focuses on vehicles that have vehicle windows that are used, at least temporarily, to provide a view from the vehicle interior to the outside. A key aspect of the present disclosure is the use of such vehicle windows as display surfaces for displaying visual content that can be perceived from the outside (outside the vehicle) or inside (inside the vehicle).

[0016] The image surface is the surface that is generally available for display, i.e., on which the projection unit can generate an image. The projection unit comprises at least one projector (beamer) directed at the vehicle windshield. The control unit can be designed as a distributed control unit or as a centralized control unit. The system can be integrated into a vehicle, whereby the necessary components can be placed discreetly. In particular, In addition, the system is barely noticeable to pedestrians and other road users when inactive. This increases its acceptance in urban areas.

[0017] In opaque mode, the projection screen is at least translucent (partially translucent), but less transparent than in transparent mode. In opaque mode, the projection screen serves as an image surface or "screen" for at least one projector of the projection unit. In transparent mode, the projection screen can serve its original purpose (providing an unobstructed view). The discreet integration into the screen even allows the use of front side windows (driver and passenger) and, under certain circumstances, even the windshield to display visual information, especially when the vehicle is parked.

[0018] In exemplary embodiments, in the opaque mode of the projection film, the light projected from the projection unit onto the projection film is completely or almost completely scattered within the vehicle window. This reduces or prevents the emission of directed light into the vehicle's surroundings. In other words, the projection of visual content onto surfaces other than the image surface of the vehicle window is minimized or prevented. This can provide regulatory advantages.

[0019] According to an exemplary embodiment, the projection screen is a switchable PDLC screen that can be controlled via the projection screen control unit with an alternating voltage at a defined frequency. The selected frequency (or frequency range) is adapted, for example, to the refresh rate of the projection unit to avoid artifacts such as flickering.

[0020] A PDLC film can also be referred to as a "polymer dispersed liquid crystal" film. Alternatively, the use of a so-called SPD film, which can also be referred to as a "suspended particle device" film, is conceivable.

[0021] The transparency of such films can be influenced by applying an electrical voltage. Designs of such films are conceivable which are opaque in the inactive state (low light transmittance), while in the active (energized) state the transparency is increased (higher light transmittance). However, designs of such films are also conceivable which are opaque in the active (energized) state (low light transmittance), while in the inactive state the transparency is increased (higher light transmittance). In the opaque state, a certain degree of light transmittance is nevertheless present; the opaque state can also be referred to as the translucent state. However, the transmittance for directed light is at least significantly minimized. In the opaque state, the projection film resembles so-called frosted glass (opaque white glass that is translucent but only partially transparent).

[0022] The transparency of a PDLC film or LC (liquid crystal) film can be reversibly changed by applying a voltage. The voltage level can influence the degree of transparency. Typically, an alternating voltage is applied to avoid visually perceptible drift (caused, for example, by conductivity through the film). PDLC films have a short response time (in the range of hundredths of a second).

[0023] PDLC films are based on a polymer liquid crystal film embedded between two films with a conductive layer and connected to a voltage source. Randomly oriented liquid crystal molecules are located within the solid polymer. The incident light is scattered from within, creating an opaque, similar to frosted glass. When an electrical voltage is applied, the liquid crystal molecules arrange themselves in the electric field, making the glass transparent to the eye. When the voltage is removed, the liquid crystal molecules become disordered again, and the film becomes opaque and thus almost completely non-transparent. These properties make PDLC films suitable for rear projection. When the switching state (voltage on or off) and the resulting optical properties (transparent or opaque) are inversely related, they are referred to as TPDLC films.These are opaque when voltage is applied and transparent when no voltage is applied.

[0024] It is understood that the system according to the disclosure and the method according to the disclosure can be developed and configured in the same way. The features described above and below can therefore be used both within the framework of the system according to the disclosure and within the framework of the method according to the disclosure.

[0025] According to a further exemplary embodiment, the control device is configured to operate the projection unit and the projection film in such a way that low-flicker or flicker-free perception is enabled. In exemplary embodiments, this refers to the perception by passersby and users in the vicinity of the vehicle. However, in further embodiments, this also refers to indirect perception by passersby and users who perceive the visual content via mobile devices (smartphones and the like) whose cameras are directed at the image surface on the vehicle windshield, with the content being reproduced on a display of the mobile device.

[0026] One possible approach to reducing the tendency to flicker is to use projection screens whose opaque mode is achieved in an inactive state (without an applied control voltage). Thus, no AC voltage of a specific frequency is required to operate the projection screen in opaque mode.

[0027] Another conceivable approach to reducing flicker is the use of projection screens whose opaque mode is achieved in an active state (with a control voltage applied). Although an alternating voltage of a specific frequency is then required, this can be selected sufficiently high to reduce flicker. This avoids adverse interactions (interference, etc.) with the refresh rates of the projection unit and / or the cameras used by passersby on their mobile devices. In general, the frequency of the control voltage should be high enough to minimize or eliminate the perceptibility of fluctuations in the display caused by given alternating frequencies in the visual perception of users.

[0028] According to another exemplary embodiment, the frequency of the projection screen is selected and adapted to a refresh rate of the projection unit and / or to common refresh rates of mobile device cameras, enabling low-flicker or flicker-free viewing. In this way, the flickering can be influenced and reduced during direct viewing and, if appropriate, during indirect viewing via a camera and a mobile device display (using interactive options, augmented reality).

[0029] Along the process chain from the projection unit to the mobile device of a user (e.g., a passerby), the frame rate of the projection unit's input signal, the refresh rate of the projector used by the projection unit, the switching frequency of the projection screen, the frame rate of the mobile device's camera, and, if applicable, the refresh rate of the mobile device's display would generally need to be considered. Furthermore, the user's typical flicker fusion frequency can be considered (for humans, this typically ranges between 22 Hz and 90 Hz, depending on the brightness).

[0030] According to another exemplary embodiment, the projector control adjusts the brightness of the projection unit depending on a brightness parameter. This can improve image quality under different lighting conditions.

[0031] According to a further exemplary embodiment, at least one brightness sensor is provided, which is installed in particular close to the windscreen or integrated into the vehicle windscreen, wherein the projector control uses a signal provided by the brightness sensor as a brightness parameter. This has the advantage that the light intensity of the projector of the projection unit can be adapted to the current brightness. For example, in the dark, the light intensity can be reduced. In bright conditions, the light intensity can be increased accordingly to ensure good perceptibility. Overall, this can also have a positive effect on energy consumption. A brightness sensor integrated into or close to the windscreen measures very close to the image area used for the display. In this way, for example, a distinction can be made between a A distinction can be made between the shady side and the sunny side of the vehicle. This can help ensure optimal visibility of the visual content.

[0032] In an exemplary embodiment, at least one brightness sensor is integrated into the projection screen. Alternatively or in addition to the brightness sensor, a time-of-day (astronomical) and / or weather-dependent (sunshine, overcast) control system is conceivable. Corresponding information can be provided to the control device.

[0033] In one exemplary embodiment, the image generated by the projector of the projection unit is adapted to a given screen geometry. This can take into account the installation location of the projection unit and the resulting positioning relative to the screen, for example, by means of keystone correction. In addition, adaptation to a screen curvature or pane curvature can be performed. The image generated by the projector is subjected to pre-distortion so that the image visible to a viewer appears as distortion-free as possible. Pre-distortion can be performed electronically by manipulating the image data. In principle, pre-distortion can also be achieved by influencing the projector's optics.

[0034] In an exemplary embodiment, a contrast film designed as a switchable film is also applied to the vehicle window, in particular on a side of the projection film facing the projection unit or on a side of the projection film facing away from the projection unit. The contrast film serves to increase the contrast and consequently improve the image quality. In this way, the perceptibility of the displayed information can be further improved, for example, in daylight. From the perspective of a passerby looking at the screen from outside or inside the vehicle, the contrast film can provide a suitable background for the display.

[0035] Accordingly, in addition to the projection screen, there is another screen whose optical properties can be influenced by applying a voltage or similar. Certain optical properties of the contrast screen and the projection screen The desired optimal visibility – under given conditions – can also be achieved by using a higher degree of tint. In this way, potentially distracting brightness in the vehicle's interior that is not attributable to the projection unit can be specifically "blocked out." The image generated by the projection film becomes more visible.

[0036] According to another exemplary embodiment, the contrast film is designed as an electrochromic film. An electrochromic film utilizes the property of electrochromic materials to change the light transmission depending on the applied voltage (usually direct current). This effect can be reversed by changing the polarity of the voltage. The contrast film can thus be switched between a darkened state (low transparency) and a state of high transparency. Intermediate states are conceivable, which can be achieved, for example, by varying the duration of the applied voltage during the switching process.

[0037] The switching speed of a contrast film designed as an electrochromic film is typically significantly slower than that of a projection film designed as a PDLC film. Switching between a state of high transparency and a state of low transparency typically requires at least several seconds. However, this is dynamic enough to react to changes in brightness, especially when the vehicle is parked. One advantage of the electrochromic film is that a selected and set state can be maintained with less (or no additional) energy consumption. A current state can be maintained with or without current.

[0038] According to another exemplary embodiment, the system further comprises a contrast film control for the contrast film, which influences the tinting level of the contrast film depending on a brightness parameter. The brightness parameter can be provided, for example, by a brightness sensor. The brightness parameter can also be selected based on the time of day (astronomical), the weather (sunshine, overcast sky), or other influencing factors.

[0039] The projection screen control and the contrast screen control can access the same brightness sensor. The same applies to the projector control. This way, the current brightness level can be taken into account equally when controlling the projection unit, the projection screen, and the contrast screen.

[0040] According to a further exemplary embodiment, a UV protection film is also applied to the vehicle window, in particular on a side of the projection film facing away from the projection unit. In one exemplary embodiment, the UV protection film is integrated into a (multi-layer) design of the projection film. The UV protection film typically comprises a UV-resistant material that may contain UV-absorbing particles. The UV protection film protects vehicle occupants from excessive UV radiation (ultraviolet radiation). Furthermore, the UV protection film protects the projection film and, if applicable, the contrast film from excessive UV radiation. In this way, the service life of the components can be increased.

[0041] It goes without saying that the projection film and, if necessary, the contrast film can be designed to be heat-reflecting (IR-reflecting). This prevents excessive heating of the vehicle interior.

[0042] It is also understood that further measures to optimize the optical properties of the vehicle windshield are conceivable. This includes, for example, anti-reflective coating of the vehicle windshield, particularly on its exterior, to reduce unwanted reflections.

[0043] According to a further exemplary embodiment, the control device comprises the projector control and the projection foil control, wherein the control device in particular also comprises a contrast foil control, and wherein the control device, during operation of the system, takes into account at least one brightness parameter provided by at least one brightness sensor located near or integrated into the windshield. In this way, the required components can be centrally located within the vehicle. A suitable installation location for the The control unit could be located, for example, in the trunk and / or the space under the rear seat or a vehicle seat. Other installation locations are, of course, conceivable.

[0044] According to a further exemplary embodiment, the vehicle window is designed as a single pane, wherein at least the projection film and in particular also the contrast film and / or the UV protection film are attached to an inner side of the single pane. The films are therefore applied to the inside of the pane. It goes without saying that the single pane can nevertheless be designed as safety glass (tempered safety glass, ESG, or laminated safety glass, VSG). What is important for this embodiment is that the projection film and any additional films are arranged on the inside of the pane. The inside is the side facing the vehicle interior. When using a UV protection film, a projection film and a contrast film, the UV protection film is usually located on the outside to protect the projection film behind it and the contrast film behind the projection film.

[0045] When using laminated safety glass (LSG), a polymer film (e.g., polyvinyl butyral, PVB, or ethylene vinyl acetate, EVA) is typically placed between at least two glass panes. The interlayer typically also serves as an adhesive film to bond the two panes together. This increases sound insulation and burglary protection. The entire pane can therefore contain additional films.

[0046] In an exemplary embodiment, a single-pane design has a protective film applied to the inside, covering the projection screen and, if applicable, the contrast screen. This provides good protection for the potentially sensitive active screens.

[0047] According to a further exemplary embodiment, the vehicle window is designed as a multiple pane, wherein at least the projection film and in particular also the contrast film and / or the UV protection film are arranged between an outer pane and an inner pane. In other words, the films are i.e., embedded between two panes of glass. Typically, this is a double pane with two panes between which the films are arranged. At least one brightness sensor can also be arranged between the two panes. This provides good mechanical protection. The individual panes can each be designed as toughened or laminated safety glass. This does not preclude the individual panes from fulfilling other optical functions, such as serving as additional sun protection.

[0048] According to another exemplary embodiment, the projection screen is in a passive, voltage-free state in transparent mode, and in an active, voltage-applied state in an opaque or partially opaque mode. According to this embodiment, at least the projection screen exhibits maximum transparency when no voltage is applied or the system for providing visual content is completely deactivated. A so-called TPDLC screen is suitable for this purpose, for example.

[0049] This can bring regulatory benefits, as it ensures road safety through the high transparency of the windows, even under abnormal operating conditions. Thus, it is conceivable to use front side windows and, if necessary, even the windshield of a vehicle to provide visual content. In the event of a defect, the respective window remains highly transparent.

[0050] According to another exemplary embodiment, the projection film is a TPDLC film. A TPDLC film is a reverse-connected PDLC film that exhibits high transparency in a voltage-free state and reduced transparency (opaque state for projection) when voltage is applied.

[0051] According to another exemplary embodiment, the vehicle window is a front side window or a windshield of the vehicle. For example, using a TPDLC film as a projection film ensures that the window exhibits high transparency when de-energized.

[0052] In principle, rear windows (e.g., rear side windows, trunk side windows, and rear windows) are also suitable as vehicle windows for the image area of ​​the system according to the disclosure. For example, vehicle windows behind the so-called B-pillar of a vehicle body are suitable. From a regulatory perspective, it is acceptable for these windows to have a certain degree of darkening (reduced transparency) even when inactive. In other words, rear vehicle windows can be equipped with projection films designed as PDLC films.

[0053] According to another exemplary embodiment, the system further comprises a projector housing that can be mounted in the roof area of ​​the vehicle interior and houses at least the projection unit. Such a projector housing can be arranged, for example, in the area of ​​the roof lining above the rear seats of the vehicle. For example, mounting it instead of a central reading light is conceivable.

[0054] According to another exemplary embodiment, the system further comprises at least one acceleration sensor for determining a motion parameter. For example, the acceleration sensor is integrated into the control device. In one exemplary embodiment, the acceleration sensor is integrated into the projector housing. It is understood that multiple acceleration sensors can be installed.

[0055] An acceleration sensor detects motion information. The acceleration sensor can be configured, for example, as an inertial sensor and / or a yaw rate sensor. An acceleration sensor can obtain information about acceleration, but also indirectly about position and orientation in space. At least one acceleration sensor can be used for control purposes, for example, to ensure that the system is (at least normally) inactive when the vehicle is moving. It is conceivable that, in the event of special traffic conditions (traffic jams, accidents, etc.), the system could also be activated while the vehicle is in use to display information.

[0056] However, the acceleration sensor can also be used to detect abnormal operating conditions. This includes, for example, the detection of attempted theft, tampering, vandalism, or similar. Accident detection (vehicle crash) is also conceivable, after which corresponding warnings and notifications can be displayed as content.

[0057] It goes without saying that the system can include additional sensors, for example, for satellite-based positioning (GPS). Such data can be combined with data provided by the accelerometer. This data can be used to expand the range of functions (localization of the displayed content) but also for security measures (no display when the vehicle is moving, theft detection, etc.).

[0058] According to a further exemplary embodiment, the system has at least one image capture unit arranged in the vehicle interior with at least one camera, which is in particular adjacent to the projection unit, wherein the camera is directed towards the vehicle window that can be irradiated by the projection unit.

[0059] The camera can generally be used to monitor the vehicle interior, for example, in the event of tampering, vandalism, or theft. However, the camera can also be used to capture scenes outside the vehicle.

[0060] If the image capture unit is used to capture the surroundings of the vehicle, for example, to capture pedestrians, the control device can be configured to temporally or spatially time the image capture in such a way that there is no disruptive overlap with the image generated directly on a vehicle window. For example, the image capture with the at least one camera can be used through areas of the same vehicle window or another vehicle window that are not, or not currently, used for displaying the content. Temporal timing can be achieved, for example, by alternating observation phases and display phases. If necessary, a control- Technical segmentation of the image area can be used to specifically exclude sections of the image area from the display—at least temporarily. Such image areas are then generally available for observation with the image acquisition unit.

[0061] According to a further exemplary embodiment, the control device is designed to detect the presence of pedestrians through the vehicle window and, based on this detection, to control at least the projection unit and the projection film. For example, the system can be deactivated or switched to an energy-saving mode if it is determined that there are no pedestrians in the vicinity of the vehicle. Conversely, the system can be activated if pedestrians are present. It is also conceivable to display information only on certain vehicle windows that are currently visible to pedestrians, while omitting other vehicle windows that are not currently visible to pedestrians.

[0062] Furthermore, the image capture unit with the at least one camera can also be used to track the movement of pedestrians. In the case of multiple possible image areas on multiple vehicle windows, the image capture unit can be used to specifically target those image areas that are within the potential field of vision of the pedestrian. Furthermore, the image capture unit can also be used to capture user reactions. In this way, it can be determined, for example, using facial recognition, eye tracking (pupil tracking), and the like, whether a pedestrian is actively perceiving the displayed content.

[0063] It is fundamentally conceivable to provide multiple display surfaces for a vehicle, for example, by using multiple vehicle windows as a display surface. Accordingly, an image to be displayed can be sequenced and distributed across multiple display surfaces. It is also fundamentally conceivable to consider the respective viewing angle of an observer (passerby) in relation to the vehicle. This can, for example, be achieved with a passerby approaching a vehicle from behind, passing its side, and then moving away over the front of the vehicle. suitable display first in the rear window, then in one or more side windows and finally in the windshield.

[0064] Furthermore, the image capture unit can also be used to provide interactive functions, such as capturing feedback from the viewer. This can be done through appropriate gestures, such as hand signals and other movements from the viewer.

[0065] According to an exemplary embodiment, the vehicle window itself is used as an input device for interactive functions. This can be achieved, for example, by integrating a touch foil that responds to touch and / or proximity. The touch foil can be arranged behind the (outer) glass pane of the vehicle window, thus ensuring good mechanical protection.

[0066] According to another exemplary embodiment, the control device is configured to detect pedestrians and / or vehicle occupants using the image capture unit, at least in the event of an abnormal operating condition. An abnormal operating condition could be, for example, an attempted tampering, theft, or vandalism. This can also occur in the event of an accident. In principle, this function can also be used for traffic monitoring, environmental monitoring, and the like.

[0067] According to another exemplary embodiment, the system, in particular its control device, comprises additional sensors for detecting wireless networks (clients and / or access points). This can include established standards such as Wi-Fi, Bluetooth, 3G, 4G, 5G, NFC, and the like. In this way, the presence of passersby can be indirectly determined from the presence of mobile devices. Furthermore, content can be started when passersby are present and / or ended when they are absent, and / or the content can even be individually adapted to the passersby.

[0068] According to another exemplary embodiment, the system further comprises a power supply unit with a battery, which is provided in addition to a vehicle battery in the vehicle. For example, the system's battery can be charged directly or indirectly via the vehicle's battery or its alternator. A battery provided in addition to the vehicle battery ensures that the vehicle can be operated regardless of the system's battery state. The power supply unit can ensure that the battery can be replaced. It is understood that the power supply unit can also be structurally integrated into the control device.

[0069] According to another exemplary embodiment, at least the projection film control or the contrast film control is coupled to the vehicle battery for power supply. This can be advantageous from a regulatory perspective because it ensures that the projection film or the contrast film can be supplied with power when the vehicle is in use. Consequently, energy is available to increase the transparency of the switchable films when the vehicle is in motion.

[0070] According to another exemplary embodiment, the vehicle window itself is used as an energy source to provide operating power. This allows the battery of the power supply unit to be charged during system operation, but also when the system is paused. This can be implemented, for example, using a PV film (film for flexible photovoltaics) attached to the vehicle window or integrated into the vehicle window.

[0071] In addition to the projection film and, if applicable, the contrast film, the vehicle window can also contain additional films. These can be one or more films selected from the following group: UV protection film, mechanical protection film, PV film, IR protection film, touch film, and combinations thereof. The UV protection film is usually an external film (facing the vehicle's surroundings) because it protects the films behind it from potentially harmful UV radiation. In one exemplary embodiment, the films are coordinated with their effective wavelength ranges, so that functionality is still maintained even when several films are arranged one behind the other.

[0072] According to another exemplary embodiment, at least the projection screen control or the contrast screen control is functionally coupled to an activation system (e.g., ignition lock, starter button) and / or access system of the vehicle (e.g., keyless go system, external access software, fleet management system). This coupling can, of course, affect the entire control system. In this way, at least the image display in the vehicle window and, if necessary, the entire system can be deactivated when the vehicle is to be moved.

[0073] It is understood that the features of the disclosure mentioned above and those to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own, without departing from the scope of the present disclosure.

[0074] Further features and advantages will become apparent from the following description of several preferred embodiments with reference to the drawings. They show: Fig. 1: a perspective rear view of a vehicle incorporating a system for providing visual content perceivable outside or inside the vehicle; Fig. 2: a plan view of the vehicle based on Fig. 1 to illustrate a vehicle environment; Fig. 3: a side view of the vehicle based on Figures 1 and 2 to illustrate a vehicle interior; Fig. 4: a highly simplified schematic view of an embodiment of a system according to the disclosure; Fig. 5: a schematic sectional view through an embodiment of a vehicle window to illustrate a layer structure; Fig. 6: a schematic sectional view through a further embodiment of a vehicle window to illustrate a layer structure; Fig. 7: a schematic perspective sectional view of a vehicle window to illustrate an active operating mode with display of visual content on the window; Fig. 8: a further perspective sectional view based on Fig. 7 to illustrate an inactive operating mode with increased transparency of the pane; Fig. 9: another sectional view based on Fig. 8 with a changed view orientation to further illustrate the inactive operating mode; and Fig. 10: a schematic block diagram illustrating an embodiment of a method for displaying visual content in a vehicle.

[0075] Fig. 1 shows a perspective view of a system, designated overall by 10, for displaying visual content in a vehicle 12. In particular, the system 10 is designed to display visual content (information, messages, advertising and the like) on the vehicle 10 in such a way that the content is perceptible outside or inside the vehicle 10.

[0076] The vehicle 12 has a body 14 with a plurality of vehicle windows 16. The vehicle windows 16 typically serve to perceive the surroundings of the vehicle 12 from within the vehicle 12. The system 10 uses at least one of the vehicle windows 16 to display visual content. The vehicle windows 16 include, for example, a windshield 18, front side windows 20, rear side windows 22, a rear window 24, and the like. Other vehicle categories may have other types of vehicle windows 16 installed.

[0077] The system 10 enables the use of at least some of the vehicle windows 16 as an image surface 30 for displaying visual content 32 (shown here only symbolically). In the exemplary embodiment according to Fig. 1, the front side window 20, the rear side window 22 and the rear window 24 serve as an image surface 30 for displaying visual content 32. The image surface 30 can cover the entire or almost encompass the entire vehicle window 16. However, it is also conceivable to use a subset of the surface of the vehicle window 16 as the image surface 30. In the exemplary embodiment according to Fig. 1, the image surface 30 of the rear window 24 is designed such that the surface of the rear window 24 is completely or almost completely filled. Similarly, the surfaces of the other windows 18, 20, and 22 can also serve completely or almost completely as the image surface 30.

[0078] Fig. 1 further shows a mobile device, designated 40, which is exemplified as a smartphone. The mobile device 40 has a camera 42 for capturing the surroundings of the mobile device 40. Furthermore, a screen 44 is provided for displaying information. In the exemplary embodiment according to Fig. 1, the mobile device 40 is directed with its camera 42 toward the rear side window 22 in order to reproduce the visual content 32 displayed there in the image area 30; compare an image section designated 46 with reproduced content. Furthermore, when using the mobile device 40, it is also conceivable to utilize its range of functions to provide interaction options and / or AR (augmented reality) effects; compare the optical effect designated 48 on the screen 44 in Fig. 1.In this way, additional information 48 can be displayed using the mobile device 40 by interacting with the system 10, which may overlay the image (displayed content 46). However, this is not to be understood as limiting.

[0079] Fig. 2 illustrates a top view of the vehicle 12 according to Fig. 1. A schematic representation shows a projector housing 50, which is arranged in particular in the interior of the vehicle (for example, in the area of ​​the roof lining). The projector housing 50 accommodates at least one projection unit 52. Furthermore, at least one image capture unit 54 is provided in the exemplary embodiment. If a plurality of the vehicle windows 18, 20, 22, 24 are to be used to provide the visual content, a plurality of such projection units 52 and / or image capture units 54 can be provided, which are aligned accordingly.

[0080] The at least one projection unit 52 is designed to project an image onto at least one of the vehicle windows 18, 20, 22, 24. The at least one image capture unit 54 is designed to observe the surroundings of the vehicle. for example, through one of the vehicle windows 18, 20, 22, 24. In exemplary embodiments, the image capture unit 54 is also designed to monitor an interior of the vehicle.

[0081] In Fig. 2, 58 also indicates an acceleration sensor, which is accommodated, for example, by the projector housing 50. The acceleration sensor 58 allows the determination of accelerations, movements, positions, and / or orientations. In this way, it can be detected whether the vehicle 12 is moving or not. In principle, the acceleration sensor 58 can also be used to detect attempts at manipulation, theft, vandalism, and the like if corresponding signals indicate an impact on the projector housing 50. In one exemplary embodiment, the acceleration sensor 58 is coupled to the at least one image capture unit 54 in such a way that, in the event of an abnormal operating state, the surroundings of the vehicle 12 and / or the vehicle interior are monitored.

[0082] Fig. 2 further illustrates various pedestrians 60 moving in the vicinity of the vehicle 12. It is conceivable, in principle, to detect the presence of the pedestrians 60 using the at least one image capture unit 54. In principle, the system 10 can react to the presence of pedestrians 60. In the event of the absence of pedestrians 60, the system 10 can be put into a power-saving mode.

[0083] The vehicle 12 has a vehicle battery 66, which is schematically indicated in Fig. 2. The vehicle battery 66 is independent of the system 10. In the exemplary embodiment according to Fig. 2, the system 10 comprises a control device 70, which is coupled, for example, via a line designated 72, to the projector housing 50 and consequently to the at least one projection unit 52 and (if present) the at least one image capture unit 54 and / or the at least one acceleration sensor 58. In the exemplary embodiment, the control device 70 is designed as a central control device. It is understood that the control device 70 can also be designed as a distributed control device. Communication within the system 10 can be wired or wireless.

[0084] The control device 70 is coupled to a power supply unit 74 via a power supply line 78. The power supply unit 74 comprises at least one battery 76. The battery 76 serves to supply power to the system 10. In the exemplary embodiment, the battery 76 is provided in addition to the vehicle battery 66. In this way, the functionality of the vehicle 12 is not impaired. The battery 76 is, for example, replaceable. It is also conceivable to charge the battery 76 via a system integrated into the vehicle 12. This can comprise a charging process using the vehicle battery 66 and / or an alternator integrated into the vehicle 12. However, it is also conceivable to implement a power supply in the vehicle 12 that operates independently of vehicle-side components. This can, for example, be photovoltaics or similar installed in addition to the vehicle's own electrical / electronic system.with appropriate charging control for the battery 76.

[0085] Fig. 3 is based on the illustrations in Fig. 1 and Fig. 2 and illustrates a vehicle interior 80. The projector housing 50 with the at least one projection unit 52 and the at least one image capture unit 54 is arranged in the exemplary embodiment in the roof area 82 of the vehicle, but in the vehicle interior 80. The system 10 is designed to be as unobtrusive as possible when viewed from outside or inside the vehicle 12, at least in an inactive mode when no visual content is displayed.

[0086] Vehicle occupants 84 sit in the vehicle interior 80. During normal operation of the vehicle 12 (active participation in road traffic), the system 10 is typically operated in such a way that a clear view through the vehicle windows 16 is possible. In other words, the vehicle windows 16 should be as transparent as possible from the perspective of the vehicle occupants 84 when looking outside. This principle may be deviated from in special cases (warning of dangerous situations, traffic jams, and the like).

[0087] The image capture unit 54 has at least one camera 86, which can also monitor the vehicle interior 80 if necessary. This can be used, for example, if vehicle occupants 84 cause damage, tampering, Pulation or theft of the projector housing 50 or other components of the system 10 is imminent or has occurred. For this purpose, data determined by the acceleration sensor 58 (see Fig. 2) can also be used. The at least one camera 86 can also be used to monitor a vehicle's surroundings in order to detect pedestrians 60 (see Fig. 2).

[0088] In Fig. 3, 90 brightness sensors are also indicated, which are integrated into the vehicle windows 16. At least one brightness sensor 90 is provided, which is at least adjacent to the image surface 30 for the content to be displayed. Detecting the current brightness in the area of ​​the vehicle windows 16 allows for targeted control of the at least one projection unit 52. In particularly bright surroundings, the projection unit 52 can, for example, be operated at a particularly high light intensity; in dark surroundings, the situation is reversed.

[0089] Fig. 4 illustrates, using a schematic block diagram, components and assemblies of an embodiment of the system 10, which is integrated into a vehicle 12 in Figures 1-3.

[0090] The system 10 comprises a control device 70, which is coupled for control purposes to the projection unit 52 with at least one projector and to the at least one vehicle window 16. The vehicle window 16 is provided with at least one switchable projection film and optionally with a switchable contrast film, which are controlled via the control device 70. In exemplary embodiments, at least one brightness sensor (compare the brightness sensor 90 in Fig. 3) is also integrated into the vehicle window 16. Here, too, a functional coupling with the control device 70 can be provided. For these purposes, the control device 70 can be provided with a projector controller 94 and a projection film controller 96. In the case of a switchable contrast film, a contrast film controller 98 is also conceivable as a component of the control device 70.

[0091] If an image capture unit 54 with at least one camera 86 (see Fig. 3) is provided on the system side, a corresponding coupling is also carried out. with the control device 70. Furthermore, the control device 70 is coupled to the energy supply unit 74 with at least one battery 76. In the exemplary embodiment according to Fig. 4, an (optional) condition monitor 102 is also provided in the control device 70, which can be used, for example, to detect abnormal operating states (vandalism, theft, tampering, accidents, and the like). For this purpose, the condition monitor 102 can access data provided by at least one acceleration sensor (compare the acceleration sensor 58 in Fig. 2) and control the image capture unit 54 in order to monitor an interior and / or surroundings of the vehicle 12 with the camera 86.

[0092] It is understood that the control device 70 may have additional components and functionalities. This includes, for example, the implementation of a position detection system (GPS, inertial navigation, or similar), the coupling with vehicle-side systems, such as for charging the battery 76 of the power supply unit 74, and the like.

[0093] In the exemplary embodiment, the control device 70 further comprises a communication unit 104 configured to provide communication with a server 106, for example, in a cloud environment 108. The content to be displayed can be provided via the server 106, which is processed by the control device 70 in the vehicle 10 and displayed on the vehicle window 16. Further information and commands relating to the operation of the system 10 can also be exchanged with the server 106. This can also include billing data or payment data for content displayed (for advertising purposes).

[0094] The control device 70 may include further modules and further sensors, for example GPS sensors, sensors for detecting radio networks and the like.

[0095] Fig. 5 illustrates, using a schematic sectional view, an embodiment of a vehicle window 16 that can be used to display visual content. Fig. 6 shows an alternative embodiment of a vehicle window 16. The vehicle Window 16 is a component of system 10. Depending on its configuration, the vehicle window 16 can be designed as a windshield 18, a front side window 20, a rear side window 22, and / or a rear window 24. Use as a front side window 20 or even as a windshield 18 is often dependent on regulatory requirements.

[0096] In Figures 5 and 6, a block arrow 114 each illustrates a view of the window 16 from the inside (from the vehicle interior 80, see Figure 3). The opposite block arrow 116 each illustrates a view of the window 16 from the outside, i.e., from the surroundings of the vehicle 12.

[0097] The vehicle window 16 according to Fig. 5 is designed as a single pane. Viewed from the outside, there is a pane 120, to which an (optional) UV protection film 122, a projection film 124, and an (optional) contrast film 126 are connected. At least the projection film 124 is a mandatory component of a system 10 according to the disclosure for displaying visual content. The UV protection film 122 serves to reduce UV exposure in the vehicle interior. This function can also be partially performed by the projection film 124 and, if applicable, the contrast film 126. A key purpose of a system 10 according to the disclosure is to provide visual content for observation from outside or inside the vehicle 12 by means of rear projection onto the vehicle window 16. Therefore, the structure of the vehicle window 16 provided with at least one projection film 124 is adapted to irradiation from the inside (arrow 114) and observation from the outside (arrow 116) – or alternatively, to observation from the inside.

[0098] In the illustrated embodiment, pane 120 is designed as a single pane, such as single-pane safety glass. In principle, a structure of pane 120 consisting of multiple layers (laminated safety glass) is also conceivable.

[0099] The projection screen 124 is suitable for rear projection. The projection screen 124 can therefore be illuminated from the inside by the projection unit 52 to create an externally perceivable image for passersby or the like. The projection film 124 is designed as a switchable film, which is controlled via a projection film control 96, which applies an alternating voltage to the projection film 124 as required.

[0100] In exemplary embodiments, a contrast film 126 is arranged on the inside of the projection film 124. The contrast film 126 is designed as a switchable film and can be controlled via a contrast film control 98. The contrast film 126 can be specifically darkened / tinted by applying a voltage via the contrast film control 98 in order to increase the contrast when observing the visual content displayed on the projection film 124 from the outside. This is useful, for example, when the surroundings of the vehicle 12 are very brightly lit (direct sunlight). In principle, an additional protective film can be attached to the inside of the vehicle window 16 (not shown separately in Fig. 5). The projection film control 96 and the contrast film control 98 are components of the (higher-level) control device 70.

[0101] The structure of the vehicle window 16 illustrated in Fig. 6 is similar to that of Fig. 5. However, the vehicle window 16 is designed as a multiple pane and is provided with an outer pane 120 and an inner pane 128, between which at least the projection film 124 and, if necessary, the contrast film 126 and / or the UV protection film 122 are arranged. The multiple pane design increases the mechanical protection of the films used. Brightness sensors and the like can also be integrated into the design of the vehicle windows 16 according to Fig. 5 and Fig. 6.

[0102] With reference to Figures 7-9, various operating states of the system 10 and its components are illustrated. Figures 7 and 8 schematically show a vehicle window 16 in a sectional, perspective view, which also includes an outer side of the vehicle window 16 (arrow 116, view from the outside). Figure 9 shows the same state as Figure 8, although due to the changed perspective in Figure 9, an inner side of the vehicle window 16 is also shown (arrow 114, view from the inside).

[0103] In Fig. 7, system 10 is active, and projection unit 52, with at least one projector 132, generates an image (visual content 32) on projection screen 124 that is visible from the outside. For this purpose, projection screen 124 is controlled via projection screen control 96 and placed in an opaque state suitable for rear projection. If present, contrast screen 126 can also be controlled; contrast screen control 98 serves this purpose. In this way, contrast screen 126 can be tinted by applying a voltage to enhance image quality, for example, in bright environments.

[0104] Additionally, a segmentation is indicated in Fig. 7 by dashed lines at 140. The segmentation 140 represents a subdivision of at least the projection film 124 and, if applicable, also the contrast film 126, whereby the resulting regions (such as rows or columns) can be specifically controlled by the respective controller 96, 98. In the exemplary embodiment, the segmentation 140 comprises columns and rows. The segmentation 140 is drawn into the outer pane 120 in Fig. 7 for illustrative purposes. However, the segmentation 140 takes place (in terms of circuitry) at the level of the projection film 124 and, if applicable, also at the level of the contrast film 126.

[0105] By means of the segmentation 140, for example, specifically defined sections of the image area 30 (see also Fig. 1) can be excluded from the display of the visual content and, if necessary, displayed with high transparency if corresponding sections are operated via the controls 96, 98 in a different mode than the remaining sections, which continue to serve for display. The segmentation 140 does not necessarily have to contain both columns and rows. It is also conceivable to provide the image area 30 only with a segmentation into (essentially horizontal) rows or a segmentation into (essentially vertical) columns. One application example of the segmentation 140 is the targeted deactivation of the display in areas exposed to direct sunlight.Another application example of segmentation 140 is the targeted introduction of areas that are as transparent as possible into the image area 30 otherwise used for the display, so that a good view out of the vehicle or into the vehicle is still possible - at least in the "removed" transparent areas.

[0106] Figures 8 and 9 illustrate a state in which the vehicle window 16 is no longer actively used to display visual content. The projection unit 52 with the projector 132 is inactive; no irradiation of the projection film 124 occurs. At least in exemplary embodiments of the system 10, care is then taken to ensure that the projection film 124 and, if present, the contrast film 126 are in a maximally transparent state when no projection is taking place. In other words, the vehicle window 16 in the state shown in Figures 8 and 9 is as transparent as possible within the circumstances. In this state, for example, a good view to the outside is possible from the inside (arrow 114), see Fig. 9. This can also, if necessary, include a good view from the outside (arrow 116) to the inside. The degree of transparency of the vehicle window 16 can be identical or different for the two viewing directions 114, 116.

[0107] Figures 8 and 9 further illustrate a state that may be desired for regulatory reasons. According to this embodiment, the transparent state of the vehicle window 16 can be maintained or provided when the projection film control 96 and the contrast film control 98 are inactive and consequently no voltage is applied. For example, a so-called TPDLC film, which is maximally transparent in the voltage-free state, can be used as the projection film 124. With regard to the contrast film 126 (if used), it is conceivable to design and operate the contrast film control 98 in such a way that, even in the event of an interruption in the power supply, sufficient energy is buffered to control the contrast film 126 at least once in order to achieve the most transparent state possible. This state can then be maintained without voltage.

[0108] This design makes the application of the system 10 also conceivable for vehicle windows 16 in the front area of ​​the vehicle, compare the windshield 18 and the front side windows 20 in Fig. 2. In the event of a failure of the system 10, maximum transparency is then ensured, so that road safety is ensured.

[0109] It is understood that the design shown in Figures 8 and 9 with maximum transparency in other embodiments also with active projection fo- film control 96 and active contrast film control 98. This can be suitable, for example, for rear vehicle windows 16, where lower requirements exist regarding the degree of transparency during operation of the vehicle 12.

[0110] With reference to Fig. 10, an exemplary embodiment of a method for providing visual content in a vehicle is illustrated using a schematic block diagram. In particular, the method relates to the provision of visual content that can be perceived from the outside (outside the vehicle) or inside (inside the vehicle) via its vehicle windows. In particular, the method relates to the provision of visual content in a stationary (parked) vehicle that is not directly participating in road traffic. However, this is not to be understood as limiting.

[0111] The method comprises a step S10, which relates to the provision of a vehicle window. The vehicle window comprises at least one switchable projection film and, optionally, a switchable contrast film. The projection film serves as an image surface for images generated by a projection unit. The contrast film serves to increase contrast when viewed from outside or inside the vehicle.

[0112] A further step S12 relates to the provision of a projection unit with at least one projector. The projection unit is arranged in particular in the interior of the vehicle, for example, in the area of ​​the roof lining. The at least one projector is directed toward a vehicle window to display information and other content there.

[0113] A further step S14 relates to the provision of a control device comprising a projector control, a projection screen control, and optionally a contrast screen control. In exemplary embodiments, this is a central control device comprising the necessary control components for the desired display of the content.

[0114] The provision of visual content (step S16) requires the interaction of the units and elements provided in steps S10, S12, and S14. The content is provided, for example, by an on-board or external service or storage device (see step S18). The method is suitable for use in a client-server environment, with the on-board control device representing the client. This is not to be understood as limiting.

[0115] The display of the visual content in step S20 includes controlling the projection unit (step S22), controlling the switchable projection film (step S24), and, if present, controlling the switchable contrast film (step S26). The use of a switchable projection film and a switchable contrast film has the advantage that the vehicle window can have a high degree of transparency when not in use (with regard to displaying visual content). This is advantageous when the vehicle is participating in road traffic.

[0116] If the vehicle window is used to display information, the projection film can be controlled to provide a suitable surface for rear projection with the projection unit. Furthermore, if present, the contrast film can be controlled to provide a suitable (tinted) background for the display that is visible from the outside. In this way, overall, visual content that is easily visible from the outside can be provided via the vehicle window in a step S28.

Claims

Patent claims System (10) for providing visual content (32) in a vehicle (12), in particular visual content (32) perceivable from outside or inside the vehicle (12) via its vehicle windows (16), wherein the system (10) comprises the following: at least one projection unit (52), at least one image surface (30) on a vehicle window (16), wherein the projection unit (52) is designed to project visual content (32) onto an inner side (114) of the vehicle window (16), a projection film (124) mounted on or in the vehicle window (16), which is designed as a switchable film and is operable at least in an opaque mode and a transparent mode, wherein the projection film (124) serves as a rear projection film in the opaque mode, the transparency of which in the opaque mode is lower than the transparency in the transparent mode, a control device (70),which comprises at least one projector controller (94) and one projection screen controller (96), wherein the projector controller (94) is functionally coupled to the projection unit (52) to project the visual content (32) onto the projection screen (124), and wherein the projection screen controller (96) is functionally coupled to the projection screen (124) to apply a control voltage to the projection screen (124). The system (10) according to claim 1, wherein the projection screen (124) is a switchable PDLC screen that can be controlled via the projection screen controller (96) with an alternating voltage of a defined frequency. The system (10) according to claim 2, wherein the control device (70) is configured to operate the projection unit (52) and the projection screen (124) such that low-flicker or flicker-free perception is enabled. System (10) according to one of claims 1-3, wherein the projector control (94) influences a brightness of the projection unit (52) depending on a brightness parameter. System (10) according to one of claims 1-4, wherein at least one brightness sensor (90) is further provided, which is in particular installed close to the window or integrated into the vehicle window (16), and wherein the projector control (94) uses a signal provided by the brightness sensor (90) as a brightness parameter. System (10) according to one of claims 1-5, wherein a contrast film (126) designed as a switchable film is further attached to the vehicle window (16), in particular on a side of the projection film (124) facing the projection unit (52) or on a side of the projection film (124) facing away from the projection unit (52). System (10) according to claim 6, wherein the contrast film (126) is designed as an electrochromic film.The system (10) according to claim 6 or 7, further comprising a contrast film control (98) for the contrast film (126), which influences a degree of tinting of the contrast film (126) depending on a brightness parameter. The system (10) according to any one of claims 1-8, wherein a UV protection film is further applied to the vehicle window (16), in particular on a side of the projection film (124) facing away from the projection unit (52). The system (10) according to any one of claims 1-9, wherein the control device (70) comprises the projector control (94) and the projection film control (96), wherein the control device (70) also comprises a contrast film control (98), and wherein the control device (70) takes into account at least one brightness parameter during operation of the system (10), which is provided by at least one brightness sensor (90) located near or integrated into the window. System (10) according to one of claims 1-10, wherein the vehicle window (16) is designed as a single pane (120), and wherein at least the projection film (124) and in particular also the contrast film (126) and / or the UV protection film (122) are attached to an inner side (114) of the single pane (120). System (10) according to one of claims 1-10, wherein the vehicle window (16) is designed as a multiple pane (120, 128), and wherein at least the projection film (124) and in particular also the contrast film (126) and / or the UV protection film (122) are arranged between an outer pane (120) and an inner pane (128). The system (10) of any of claims 1-12, wherein the projection film (124) is in transparent mode in a passive, non-energized state, and in an opaque or semi-opaque mode in an active, energized state. The system (10) of claim 13, wherein the projection film (124) is a TPDLC film.The system (10) according to any one of claims 1-14, wherein the vehicle window is a front side window (20) or a windshield (18) of the vehicle (12). The system (10) according to any one of claims 1-15, further comprising a projector housing (50) mountable in the roof area (82) of the vehicle interior (80), which houses at least the projection unit (52). The system (10) according to any one of claims 1-16, further comprising at least one acceleration sensor (58) for determining a motion parameter. System (10) according to one of claims 1-17, further comprising at least one image capture unit (54) arranged in the vehicle interior (80) with at least one camera (86), which is in particular adjacent to the projection unit (52), wherein the camera (86) is directed at the vehicle window (16) that can be illuminated by the projection unit (52). System (10) according to claim 18, wherein the control device (70) is designed to detect the presence of passers-by (60) through the vehicle window (16) and, based on this detection, to control at least the projection unit (52) and the projection film (124). System (10) according to claim 18 or 19, wherein the control device (70) is designed to detect passers-by (60) and / or vehicle occupants (84) by means of the image capture unit (54), at least in the event of an abnormal operating state.The system (10) according to any one of claims 1-20, further comprising a power supply unit (74) with a battery (76), which is provided in addition to a vehicle battery (66) in the vehicle (12). A method for providing visual content (32) in a vehicle (12), in particular visual content (32) perceivable from outside or inside the vehicle (12) via its vehicle windows (16), comprising the following steps: Providing a vehicle window (16) with a projection film (124) mounted thereon or therein, which is designed as a switchable film and is operable in at least one opaque mode and one transparent mode, wherein the projection film (124) serves as a rear projection film in the opaque mode, the transparency of which in the opaque mode is lower than the transparency in the transparent mode, Providing a projection unit (52) for projecting visual content (32) onto an image surface (30) on an inner side (114) of the vehicle window (16), Providing a control device (70) comprising at least one projector control (94) and one projection film control (96), Controlling the projection film (124) with the projection film control (96) to operate the projection film (124) in opaque mode, and Operating the projection unit (52) with the projector control (94) to display visual content (32) on an image surface (30) on an inner side (114) of the vehicle window (16), comprising projecting the visual content (32) onto the projection film (124) with the projection unit (52).

Images