DE102021126195A1 - Projection display device for additional driver information in the interior mirror via reflection on the rear window - Google Patents

Abstract

The invention relates to a rear window projection display device for a vehicle, comprising:- a projection unit which is to be arranged in the vehicle interior in front of, below, above or to the side of the rear window opposite this and for outputting a projection light beam with a desired display content directly towards the rear window, such that this display content is presented to a vehicle occupant via reflection from the rear window as a virtual display image floating behind; and- an eyebox changing device, which is designed to determine whether this occupant looks into the rear window via an interior mirror or directly by looking over his shoulder, and for a dependent mechanical adjustment of at least one component of the projection unit to change between its first and second state;- wherein in the first state the entire bundle of rays arrives at a corresponding interior mirror eyebox of the occupant via reflection at the interior mirror, while in the second state it arrives directly from the rear window at a corresponding over-the-shoulder eyebox of the occupant.

Description

The invention relates to projection display devices in a motor vehicle or other land, air or water vehicle, which are also known under the name head-up display (HUD). Such projection display devices are designed to generate a virtual display image that is superimposed into the field of vision of an occupant via reflection on a transparent pane provided in the vehicle, such as a front or rear pane or a combiner pane provided specifically for this purpose. The invention also relates to a vehicle equipped therewith.

In this context, for example, in DE 11 2017 003 287 T5 describes a head-up road condition display with a video display for displaying images captured by a camera system. The images include a terrain around an autonomous vehicle. An augmented reality user interface is presented on the video display and is used by an occupant of the autonomous vehicle to specify a waypoint. The autonomous vehicle is then operated in a non-autonomous mode according to the user input. In particular, to display guides such. B. road shoulders, in an augmented reality representation a video processor can be used to construct images and a projector can be used to project the overlay image onto a translucent or transparent surface. Augmented reality representations can be provided, inter alia, on a window (e.g. windshield or rear window) or projected onto real objects.

Also mentioned US 2021/0056934 A1 In addition to the representation of virtual display images by a head-up display housed in the instrument panel of a vehicle, which uses reflection on the windshield to overlay the display content with the real environment, there is also an option to use the rear window for overlay. In this case, the driver can view a virtual display image projected on the rear window through the inside mirror while reversing.

Also mentioned DE 11 2018 001 422 T5 for a display control system for creating a virtual environment in a vehicle, in addition to a head-up display or a see-through display, there may be no requirement that the windshield and rear glass be always transparent or visually uncluttered in the case of autonomous driving. In this case, the windshield, rear window, and other side windows may themselves serve as display media by being configured to display one or more videos. A disadvantage of this use of a vehicle window as a projection screen, however, is that this display is equally visible to everyone in the vehicle and possibly also outside the vehicle, while a HUD-like display can be limited to an eyebox intended only for the respective user and mostly also has to for technical reasons.

It is also known to use the interior mirror as a direct view display for showing additional information for the driver. In this case, however, there is a problem that such a direct view display is too close to the eyes of many drivers. The eye can therefore no longer focus the image from a certain visual acuity, age or glasses cut (e.g. if reading strength is ground in the lower area of the glasses). This problem does not occur if the interior mirror is used for an indirect view of the rear window, because it in turn offers a long-distance view.

If important information is only shown in the interior mirror display or only in a HUD beam path limited to the interior mirror, another problem would arise when looking over the shoulder, i. H. when the view directly behind over the shoulder becomes necessary. Such a head turn with a view directly through the rear window is often used by the driver (and also by other occupants) to better recognize and assess the rear vehicle environment when reversing, parking, maneuvering, trailer coupling and trailer reversing. However, important information, which is only displayed by the interior mirror, would be missing here.

It is an object of the present invention to specify an alternative display device for a vehicle or one that is improved in terms of cost, installation space, complexity, safety, visibility, privacy and/or other aspects, which displays additional information for one or more occupants of the vehicle when looking at the rear window.

This object is achieved by a rear window projection display device according to claim 1 and by a vehicle equipped therewith according to the independent claim. Further developments are specified in the dependent claims. All further features and effects mentioned in the claims and the following description for the projection display device apply also in relation to the vehicle, as well as vice versa.

According to a first aspect, there is provided a rear window projection display device (hereinafter also simply referred to as “projection display device” or “device”), which is designed for use in a vehicle. The projection display device can be embodied as a head-up display (HUD), for example. The vehicle can be a motor vehicle, but also any other land, air or water vehicle. The vehicle has a vehicle interior (also known as a passenger compartment) provided for one or more occupants, which is delimited in the direction of travel to the front by a windscreen and in the direction of travel to the rear by a rear window.

The projection display device comprises a projection unit which is located in the vehicle interior in front of, below, above or to the side of the rear window directly opposite it, ie. H. without further optical components in between. For example, the projection unit can be accommodated in the rear of the vehicle, for example in/on the parcel shelf, in/on the sky, in/on the pillar trim, in/on one or more headrests, etc. It is designed to emit a projection light beam (hereinafter referred to as beam) with a desired display content towards the rear window, such that this display content can be displayed to a vehicle occupant via reflection of the beam on the rear window as a virtual display image floating behind it or is displayed during operation of the device becomes. For this purpose, the projection unit can have an imaging unit, for example in the form of a display or the like, for generating the bundle of rays with the display content and optionally other imaging and beam-shaping optical components such as lenses, mirrors, etc. in its beam path.

Furthermore, the projection display device includes an eyebox changer. This is firstly designed to determine whether the occupant for whom the virtual display image is intended is looking into the rear window via an interior mirror of the vehicle (i.e. indirectly) or directly (e.g. looking over the shoulder). Secondly, the eyebox changing device is designed to mechanically adjust at least one component of the projection unit depending on this determination, as a result of which the projection unit is changed between a first and a second state.

The first state of the projection unit is designed such that essentially the entire bundle of rays reflected by the rear window reaches a correspondingly defined eyebox of the occupant via the reflection on the interior mirror. In contrast, in the second state of the projection unit, essentially the entire bundle of rays, after being reflected on the rear window, arrives directly (i.e. without further deflection) at a correspondingly defined shoulder eyebox of the occupant.

An eyebox can be understood as a two-dimensional or three-dimensional interior area in the vehicle that is intended for the eyes of the respective occupant and from which the virtual display image can be perceived without restrictions. For example, the eyebox may be approximately centered about a position where the occupant's eyes are in their typical seating position and extend over a region of space in which the occupant's head can move in that seating position. Tracking using a suitable eye-tracking signal is possible for optimal delimitation and alignment of the respective eyebox during operation, but is not absolutely necessary if the seating position of the occupant can be sufficiently defined by his or her vehicle seat. The term “essentially” can mean, among other things, that the virtual display image cannot be recognized from interior areas outside of the respective eyebox and is therefore not visible to any other occupants of the vehicle.

The adjustable component of the projection unit can be, for example, a plane or concave mirror, by means of which the beam of rays is projected onto the rear window. In this embodiment, further components of the projection unit, for example the imaging unit such as a display together with its cooling device and/or beam-shaping optics present in the beam path, can be immovably mounted in the vehicle. In the case of a compact design, however, the entire projection unit can also be moved, for example tilted or rotated, in order to switch between the two states mentioned.

The aforementioned adjustment, for example rotating, tilting and/or transversal displacement, of at least one component or of the entire projection unit causes in particular such a change in direction of a central ray of the beam of rays emitted by the projection unit that it reaches the associated eyebox. The center beam can be defined as the projection light beam that emanates approximately from the center of the imaging unit and reaches the center of the interior mirror eyebox or the eyebox for looking over the shoulder of the respective occupant. Said adjustment can be implemented, for example, by a suitable electromechanical actuator.

The present projection display device thus offers the possibility of providing the occupants, in particular the driver of the vehicle, with a fully-fledged supplement, including replacing the view to the outside through the rear window, which, as usual, can be viewed both through the interior mirror and through a direct view to the rear (over-the-shoulder view). ) you can see. The use of the device for the occupant is as simple and intuitive as possible. A safety-related display is also possible because it can be reliably made available to the occupant in any situation.

There is a considerable advantage in installation space compared to known HUD systems in which projection units have to be accommodated in front of the windscreen and in the instrument panel. All of the components of the present device can, however, be arranged in the rear of the vehicle (in the direct vicinity of the rear window or at some distance from it), where as a rule significantly more installation space is available than in the cockpit. The interior mirror does not have to be modified and can be used in its classic interior mirror function to look into the rear window in order to also be able to see the virtual display image.

This does not have to impair the view to the rear of the vehicle. Rather, the device can be designed similarly to a conventional windscreen HUD to keep the view largely clear for the occupant and to display the additional information in a transparent manner. If necessary (for example if visibility to the outside through the rear window is already reduced or absent), this requirement can also be dropped and the display content can be displayed with increased intensity and/or size.

In limousines, for example, the projection unit can be located in the parcel shelf, the rear headrest, in the area of the third brake light, on the roof liner or in the pillar trim. The information and the display for the respective occupants are also visible via the eyebox changing device when the head is turned back and the driver looks directly out of the rear window, and not just by looking in the interior mirror. In particular, this information can only be visible to the driver and therefore also information on critical driving situations, overtaking manoeuvres, turning information, cyclists, distance warning when parking, distance and collision warning from traffic behind, when maneuvering and parking vs. bollards and bottlenecks or when coupling trailers, such as a trailer lane with the current steering wheel angle.

Depending on the urgency, the virtual display image can be displayed in different sizes, colors and statically or flashing/moving.

In particular, the vehicle can have one or more front seats arranged directly in front of the windshield and the occupant, in whose field of vision behind the rear window the virtual display image can be displayed in the manner mentioned, be a driver or a front passenger on one of the front seats. However, the vehicle can also have one or more rear seats arranged behind the front seats and the occupant, in whose field of vision behind the rear window the virtual display image can be displayed in the manner mentioned, be a passenger on one of the rear seats.

In particular, the projection display device and its eyebox changing device can be designed to switch between the interior mirror and shoulder view eyeboxes of two or more different occupants who are located at different locations in the vehicle interior. In other words, the device is in each case in and between the two states mentioned, which are intended for displaying the virtual display image for one of two or more different occupants of the vehicle.

According to one embodiment, the projection display device is designed to display the virtual display image in the manner mentioned for one or more occupants of the vehicle in their field of vision behind the rear window when the vehicle moves forward. The device includes a control unit, which is designed to receive current status and movement data of the vehicle and/or other road users and/or a vehicle environment from on-board and/or external sensors, live cameras and communication devices and to generate the display content dependent thereon .

With this display content, the virtual display image can provide predetermined help and warnings relating to the movement and/or the condition of the vehicle and/or the following traffic and/or recordings from one or more live cameras showing an area behind the vehicle, include. The help or warnings can be, for example, the display of distances to obstacles or the respective rearward relative speed with regard to the following traffic or obstacles located behind the vehicle such as a wall or a stationary other vehicle or a sidewalk etc. act. For example, the type of representation - such as their Size and color vary depending on suitably predefined relevance parameters (which can be related to the impending risk of collision). For example, the size of the displayed distance display can increase when approaching another parked vehicle and/or change color from green to yellow to red with the prompt to stop immediately.

In an embodiment that can be combined with the above embodiment, the projection display device is designed to display the virtual display image in the manner mentioned for one or more occupants of the vehicle in their field of vision behind the rear window when the vehicle moves backwards. Here, too, the device includes a control unit, which is used to receive current status and movement data from the vehicle's own vehicle and/or other road users and/or a vehicle environment from on-board and/or external sensors, live cameras and communication devices and for generating the Display content is formed. Analogously to the above embodiment, the virtual display image can also contain predetermined help and warnings relating to the movement and/or the condition of the vehicle and/or the following traffic and/or recordings from one or more live cameras, one behind the vehicle show lying environment include.

In a further development of the above specific embodiments, the control unit is also designed and set up to detect reduced visibility of the vehicle's exterior for its occupants through the rear window. The reduced visibility can be caused, for example, by precipitation, dirt, lighting conditions or other circumstances and can be detected using one or more predefined visibility criteria. The control unit is designed and set up to display the above-mentioned help and warning notices and/or recordings from one or more live cameras, which show an area behind the vehicle, depending on the detected reduction in visibility, in such a way that this display at least partially shows a free image Replaced the view through the rear window of vehicle movement-related objects for the occupant.

The replacement can be implemented, for example, as the display of the help or warning notices or the live camera recordings in general or the adjustment of the size, color and light intensity of this display to the detected reduction in visibility in order to reliably identify obstacles, other road users and others to ensure vehicle movement-relevant environmental objects behind the vehicle for the driver or another occupant. One or more optical sensors can be used to detect reduced visibility, for example, which detect at least part of the rear window and are installed at a suitable position in the projection unit or another component of the projection display device. However, there can also be other on-board sensors, for example external brightness sensors, from which the control unit can receive data.

In a specific embodiment, the eyebox changing device is designed to receive current data from an eye tracking device or head pose recognition device provided for the relevant occupant in the vehicle interior. The eyebox changing device is set up to use this data to determine whether this occupant is looking into the rear window indirectly via an interior mirror of the vehicle or directly by looking over his shoulder.

According to a further aspect, a vehicle, in particular a motor vehicle or any other land, air or water vehicle is provided. The spatial orientation terms used here such as “above”, “below”, “forward”, “to the rear”, “behind”, “to the side”, “horizontal”, “vertical” etc. refer to the usual Cartesian coordinate system fixed to the vehicle mutually perpendicular longitudinal, transverse and vertical directions of the vehicle.

The vehicle has a vehicle interior (passenger cell) provided for one or more occupants, which is delimited in the direction of travel, which corresponds to the longitudinal direction of the vehicle, at the front by a windshield and at the rear by a rear window. An interior mirror is arranged in the vehicle interior in front of or above an upper windshield section. The interior mirror can be designed in a conventional manner to reflect light for an indirect rear view into the rear window for the driver or other occupants and can be mechanically adjustable manually or by electrical control to adapt to the respective eye position of the driver or another occupant.

A rear window projection display device of the type presented here is provided in the vehicle, the projection unit of which is arranged in the vehicle interior in front of, below, above or to the side of the rear window opposite this. As described in more detail above, the projection unit is designed to output a projection light beam with a desired display content toward the rear window, such that this Display content can be displayed to a vehicle occupant via reflection of the beam of rays on the rear window as a virtual display image floating behind it or is displayed during operation of the device. The projection display device includes an eyebox switching device which, in operation, determines whether the occupant for whom the virtual display image is intended looks into the rear window via the interior mirror or directly by looking over his shoulder and the direction of propagation of the projection light beam accordingly between an interior mirror eyebox and a Adjusted this occupant's over-the-shoulder eyebox. For this purpose, an eye tracking or head pose detection device can be integrated or retrofitted in the vehicle interior, which is used to detect a partial space containing the eyes or the head of the relevant occupant and to determine his eye position or head pose from this and to transmit corresponding data to the eyebox changing device of the Projection display device is formed.

For the driver, for example, the interior mirror eyebox can be limited to a spatial area in front of a headrest of a driver's seat, which his head typically occupies when looking in the interior mirror. Accordingly, the driver's over-the-shoulder eyebox may be limited to a region transversely of the vehicle between the driver and passenger seats, into which the driver typically moves his head when turning to look directly into the rear window.

• 1 eine grundsätzliche Anordnung einer Heckscheiben-Projektionsanzeigevorrichtung der hierin dargelegten Art in einem Kraftfahrzeug in perspektivischer Ansicht.

The above aspects of the invention and its embodiments and specific configurations are explained in more detail below using an example shown in the attached drawing. Although the drawing can be understood, inter alia, as true to scale, this is not restrictive: it is to be understood as a purely schematic illustration of the basic structural principle, ie not as true to scale. It shows:

• 1 a basic arrangement of a rear window projection display device of the type set out herein in a motor vehicle in a perspective view.

1 shows a highly simplified perspective view of an exemplary embodiment of a vehicle 1 with a rear window projection display device 2 of the type presented here. In this example, the vehicle 1 is a motor vehicle, for example a passenger car or truck, which in 1 is indicated in simplified form by its rear window 3 and an interior mirror 4, which are located at the usual positions in the vehicle 1 for this purpose.

In this example, the projection display device 2 is provided by its projection unit 5, which is arranged in a rear area of the vehicle interior, purely by way of example, below the rear window 3 opposite the rear window. In 1 For example, the projection unit 5 can be installed in a so-called parcel shelf, which extends in the rear rear area of the vehicle 1 between a row of rear seats (not shown) and a rear window root. As described in more detail above, the projection unit 5 is designed to emit a projection light beam L with a desired display content towards the rear window 3 in such a way that this display content is presented to a vehicle occupant via reflection of the beam L on the rear window 3 as a virtual display image (in 1 not shown separately) is shown.

The occupant for whom the virtual display image is intended is in 1 indicated by his interior mirror eyebox E1, which is limited to a spatial area in front of a headrest of his vehicle seat (not shown), which his head typically occupies when looking into the interior mirror 4 (including possible back and forth movements). In 1 indicated by a central ray M1 and possible edge rays and usable reflection surface areas 6 and 7 in the rear window 3 and in the interior mirror 4. The central beam M1 connects a central point of the projection unit 5 or its imaging unit with a central point of the interior mirror eyebox E1.

The projection display device 2 includes an eyebox changing device, which in this example is part of the projection unit 5 and determines during operation whether this occupant looks into the rear window 3 via the interior mirror 4 or directly by looking over his shoulder and the entire beam path of the projection light beam L from the interior mirror -Eyebox E1 can rotate this occupant and back to a shoulder-eyebox E2, for example by using the entire projection unit 5 (as in 1 indicated by a turning arrow) is rotated. In 1 indicated by its central ray M2.

The virtual image display described behind the rear window 3 through the interior mirror 4 or by looking directly into the rear window 3 in particular, be individually adjustable for each person in order to ensure an optimal view to the rear. For this purpose, a suitable eye tracking or head pose detection device can be provided in the vehicle 1, which can also be used for the above detection of the required change between the interior mirror eyebox E1 and the shoulder eyebox E2 of this occupant.

Next to the in 1 indicated installation location for the projection unit 5 on the parcel shelf, other installation positions in the rear of the vehicle 1 opposite the rear window 3 are possible: for example in the sky, in a pillar panel, in a headrest and the like. Since the display remains visible even when the head is turned back, the device 2 is particularly well suited for reflecting in critical driving situations, such as those that can arise when maneuvering or parking with bollards etc. concealed behind the vehicle 1 or when coupling or moving a trailer .

• Über eine geeignete Projektionsanzeige durch Reflexion an der Heckscheibe 3 kann der Fahrer punktgenau das Hängermaul und die Anhängekupplung (Kugelkopf) übereinander führen. Vorteilhaft ist bei dieser Anwendung beispielsweise, dass der Fahrzeugführer die reale Situation (die Annäherung bei der Rückwärtsfahrt in Richtung Hänger) durch die Heckscheibe 3 sehen kann und hinsichtlich des Abstands, der Richtung und der Geschwindigkeit daher einschätzen kann. So kann er in der Heckscheibe 3 die genaue Position und „Fluchtung“ des Kugelkopfs und der Anhängeröse überwachen.

A possible application scenario of the device 2 is outlined below, in which the occupant is offered a view of the trailer hitch that is not covered by the above-described reflection of the additional information via the rear window 3:

• Using a suitable projection display through reflection on the rear window 3, the driver can place the trailer hitch and the trailer hitch (ball head) one on top of the other with pinpoint accuracy. It is advantageous in this application, for example, that the vehicle driver can see the real situation (the approach when reversing in the direction of the trailer) through the rear window 3 and can therefore assess the distance, direction and speed. In this way he can monitor the exact position and "alignment" of the ball head and the trailer eyelet in the rear window 3 .

Another advantage can be that dangerous situations can be perceived better, faster, more precisely and more realistically with the direct rear view together with the projection information. With a conventional representation of auxiliary information on a display in the cockpit of the vehicle 1, the entire situation is significantly less clear and intuitive and therefore less easy for the driver to assess than with the "natural" view described here directly or in the rear window 3 via the interior mirror 4. Speed, overview, steering direction and dangerous situations can be better monitored in some situations by looking over the shoulder because the driver can see information through the rear window 3 that is not included in the camera image used for this purpose, in addition to the virtual display of auxiliary information.

The additional reflected projection information supports his view, for example vertically downwards, into the area behind the vehicle 1, which cannot be seen without the device 2. For occupants and drivers who do not want to turn around, the same display is also offered by the inside mirror 4 (rear view mirror) completely automatically. A similar situation arises when reversing and parking.

reference list

1

vehicle

2

Rear window projection display device (also simply called projection display device or device)

3

rear window

4

Interior mirror (also called rearview mirror)

5

projection unit

6

Rear window area that can be used as a reflection surface

7

Interior mirror area that can be used as a reflection surface

L

Projection light beam (also called beam of rays)

M1

first central beam, which leads to the center of the inside mirror eyebox in the first state of the device

M2

second center beam leading to the center of the over-the-shoulder eyebox in the second state of the device

E1

Interior mirror eyebox

E2

Over the shoulder eyebox

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 112017003287 T5 [0002]
• US20210056934A1 [0003]
• DE 112018001422 T5 [0004]

Claims (10)

Rear window projection display device (2) for a vehicle (1), the interior of which is limited in the direction of travel at the front by a windscreen and at the rear by a rear window (3), comprising: - a projection unit (5), which is to be arranged in the vehicle interior in front of, below, above or to the side of the rear window (3) opposite this and is designed to emit a projection light beam (L) with a desired display content directly towards the rear window (3), such that this Display content is presented to a vehicle occupant via reflection of the bundle of rays (L) on the rear window (3) as a virtual display image floating behind; and - an eyebox changing device, which is designed to determine whether this occupant looks into the rear window (3) indirectly via an interior mirror (4) of the vehicle (1) or directly by looking over the shoulder, and for a dependent mechanical adjustment of at least one component of the projection unit (5) for changing between its first and second state; - wherein in the first state of the projection unit (5), essentially the entire bundle of rays (L) reflected by the rear window (3) reaches a correspondingly defined interior mirror eyebox (E1) of the occupant via reflection on the interior mirror (4), while it is in the second state of the projection unit (5) directly from the rear window (3) to a correspondingly defined over-the-shoulder eyebox (E2) of the occupant. Projection display device (2) after claim 1 wherein: - the vehicle (1) has one or more front seats arranged directly in front of the windscreen; and - the occupant in whose field of vision behind the rear window (3) the virtual display image can be displayed in the manner mentioned is a driver or a passenger on one of the front seats. Projection display device (2) after claim 1 or 2 wherein: - the vehicle (1) has one or more front seats located directly in front of the windscreen and one or more rear seats located behind; and - the occupant, in whose field of vision behind the rear window (3) the virtual display image can be displayed in the manner mentioned, is a passenger on one of the rear seats. Projection display device (2) according to any one of the preceding claims, which - can be switched to and between said two states which are intended for displaying the virtual display image for one of two or more different occupants of the vehicle (1). Projection display device (2) according to any one of the preceding claims, which - Is designed to display the virtual display image in the manner mentioned for one or more occupants of the vehicle (1) in their field of vision behind the rear window (3) when the vehicle (1) moves forward; and - comprises a control unit for receiving current status and movement data of one's own vehicle (1) and/or other road users and/or a vehicle environment from on-board and/or external sensors, live cameras and communication devices and for generating the display content dependent thereon is trained; - so that the virtual display image provides predetermined assistance and warnings relating to the movement and/or the condition of the vehicle (1) and/or the following traffic and/or recordings from one or more live cameras that are located behind the vehicle (1) Show surrounding area includes. Projection display device (2) according to any one of the preceding claims, which - Is designed to display the virtual display image in the manner mentioned for one or more occupants of the vehicle (1) in their field of vision behind the rear window (3) when the vehicle (1) moves backwards; and - comprises a control unit for receiving current status and movement data of one's own vehicle (1) and/or other road users and/or a vehicle environment from on-board and/or external sensors, live cameras and communication devices and for generating the display content dependent thereon is trained; - so that the virtual display image provides predetermined assistance and warnings relating to the movement and/or the condition of the vehicle (1) and/or the following traffic and/or recordings from one or more live cameras that are located behind the vehicle (1) Show surrounding area includes. Projection display device (2) after claim 5 or 6 , wherein the control unit is further designed - is designed to detect reduced visibility of the outside environment of the vehicle (1) for its occupants through the rear window (3) due to precipitation, dirt, lighting conditions or other circumstances, using one or more predetermined visibility criteria; and - to one of the respectively detected visibility reduction-dependent representation of the said auxiliary and warning notices and/or recordings from one or more live cameras, which show an area behind the vehicle (1), in such a way that this representation preferably provides a clear view through the rear window (3) of surrounding objects relevant to vehicle movement replaced the occupant. Projection display device (2) according to any one of the preceding claims, wherein - the eyebox changing device is designed to receive current data from an eye tracking or head pose recognition device provided for the relevant occupant in the vehicle interior in order to use this data to determine whether this occupant looked into the rear window (3) indirectly via an interior mirror (4th ) of the vehicle (1) or directly by looking over the shoulder. Vehicle (1), in particular a motor vehicle, with mutually perpendicular longitudinal, transverse and vertical directions of an on-board Cartesian coordinate system, comprising: - A vehicle interior provided for one or more occupants, which is bounded in the direction of travel, which corresponds to the longitudinal direction of the vehicle (1), at the front by a windshield and at the rear by a rear window (3); - An interior mirror (4) arranged in the vehicle interior in front of or above an upper section of the windscreen, which is designed to reflect light for an indirect view into the rear window (3) for the driver or other occupants; as well as - A projection display device (2) according to one of the preceding claims, the projection unit (5) in the vehicle interior in front of, below, above or to the side of the rear window (3) is arranged opposite this. Vehicle (1) after claim 9 , further comprising - an eye tracking or head pose detection device integrated or mounted in the vehicle interior, which is used to detect a partial space containing the eyes or the head of the relevant occupant and to determine his eye position or head pose therefrom and to transmit corresponding data to the eyebox changing device of Projection display device (2) is formed.

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