EP3837577A2

EP3837577A2 - Method for operating a visual field display device for a motor vehicle

Info

Publication number: EP3837577A2
Application number: EP19752115.6A
Authority: EP
Inventors: Wolfgang-Andreas Huber
Original assignee: Bayerische Motoren Werke AG
Current assignee: Bayerische Motoren Werke AG
Priority date: 2018-08-16
Filing date: 2019-07-22
Publication date: 2021-06-23
Also published as: CN112292630A; DE102018213820A1; CN112292630B; WO2020035264A3; WO2020035264A2; US20210271077A1; US11506891B2

Abstract

The invention relates to a method for operating a visual field display device, particularly for a motor vehicle, which comprises an autostereoscopic planar pixel array for generating a projecting light beam containing a display content, and which is designed to project this onto a partially transparent, reflective projection screen, particularly a front windscreen of the motor vehicle, in such a way that a virtual display image superimposed into a field of vision of a user is generated behind the screen, said method comprising the following steps: - providing at least one surroundings parameter and/or user parameter and - switching between at least two qualitatively different 3D and/or 2D and/or monocular operating modes of the planar pixel array, depending on the surroundings parameter(s) and/or user parameter(s) provided, in order to adapt the virtual display image to qualitative operational changes relating to the surroundings and/or the user of said visual field display device.

Description

description

Method for operating a field of view display device for a motor vehicle

Technical field

The invention relates to a method for operating a field of view display device, in particular a head-up display for a motor vehicle, and a corresponding control device and a motor vehicle equipped therewith. The field of view display device comprises an autostereoscopic flat pixel arrangement, which can be designed in particular as one or more autoste reoscopic flat screens.

Technical background

Field of view display devices in a motor vehicle are known in particular under the designation head-up display (HUD). A display content, such as an indication of a speed limit, is thus displayed as a virtual display image in the driver's field of vision in front of the motor vehicle, so that he does not have to take his eyes off the road. For this purpose, a field of view display device typically comprises a projection unit, which generates a projection light beam with the desired display unit through a display accommodated below an upper side of the dashboard with suitable projection optics and projects it onto a partially transparent projection screen, for example the front screen of the motor vehicle, from which it is reflected toward the driver.

With this conventional design, the HUD has a relatively small field-of-view, which usually only reaches the horizon, and that Distance of the virtual display image is determined by the optical structure of the projection unit. The limited space within the dashboard prevents the field of view from being enlarged. In particular, the known projection optics take up a lot of space in the vertical direction. The driver looks into a telescope, so to speak, so that a nearby display image generated on the display inside the HUD appears in the distance in front of the motor vehicle. Thus, according to an "opening of the telescope", only limited spatial angles can be displayed, in which the HUD display image can be superimposed on the view through the front screen. Contact-analog overlays, as known for example from augmented reality, are not possible outside of this limited solid angle.

On the other hand, a head-up display for stereoscopic information display in a motor vehicle is known from DE 10 2009 054 232 A1, for example, which has imaging means for generating two different individual images intended for the two eyes of an occupant and a display unit on which luminous dots can be generated, whose light rays are visible to the occupants by reflection on the windshield of the motor vehicle. Furthermore, deflection means, such as. B. a matrix-like arrangement of small lenses is provided, which deflect light rays of different light points in different radiation directions. In addition, pixel assignment means ensure such an assignment of pixels of the individual images to luminous points of the display unit that the single image intended for the left eye of the occupant and the single image intended for the right eye of the occupant are visible. An autostereoscopic display of this type can be particularly favorable for a contact-analogous display of the content.

With field of view display devices, additional measures are generally provided which prevent interference reflections from ambient light on their components, which could lead to glare to the user. In a conventional HUD, for example, a cover plate, which closes the projection unit to the outside, is geometrically anti-reflective (so-called glazing retrap). Antireflection techniques known from this are, however, not suitable for a display arranged directly opposite the windshield.

It is an object of the present invention to provide an operating method which is particularly improved with regard to the visibility of the virtual display image or the comfort of the user, for a field of view display device with an autostereoscopic display, in particular for a motor vehicle.

Disclosure of the invention

This object is achieved by a method for operating a field of view display device according to claim 1, a corresponding control unit, a computer program and a motor vehicle according to the independent claims. Further refinements are specified in the dependent claims. All further features and effects mentioned in the claims and the description for the method also apply in relation to the field of view display device, the control unit, the computer program or the motor vehicle, and vice versa.

According to a first aspect, a method for operating a field of view display device, in particular for a motor vehicle, is provided, which has an au stereoscopic flat pixel arrangement for generating a projection light beam with a display content. The field of view display device is designed to project the generated projection light beam onto a partially transparent reflective projection screen, in particular a front screen of the motor vehicle, in such a way that behind it a field of view of a user (e.g. the driver or another occupant of the motor vehicle) is faded in virtual display image is created. The process includes the following steps:

- Providing at least one environment and / or user parameter and

- Switching between at least two qualitatively different operating modes of the flat pixel arrangement, the at least one stereoscopic operating mode (also called 3D display) and / or at least comprise a monoscopic operating mode (also called 2D display) and / or at least one monocular operating mode (ie with a display only visible to one eye of the user), depending on the environment and / or user parameter (s) provided, in order to adapt virtual display image to qualitative operational changes in relation to the environment and / or the user.

The term "planar" means very generally that the pixel arrangement extends in the form of a two-dimensional pixel matrix over a surface that can be flat or at least partially curved or curved or arched. In particular, the flat pixel arrangement can, if necessary, be curved

The top of the dashboard of a motor vehicle can be adapted, for example, by being layered or nested from several smaller partial areas, such as, for. B. flat displays. The terms "qualitatively different" and "qualitative change" mean in particular a not purely quantitative difference of various operating parameters, but rather such a change in operation that fundamentally changes the perceptibility and / or visibility of the virtual display image for the user.

The switching of the flat pixel arrangement between the qualitatively different operating modes can be realized in particular by a suitable, different type of electrical control of the pixel matrix, for example in relation to the assignment of individual pixels to the display content to be generated. In particular, this involves a transition from a 3D to a 2D or to a monocular representation, or vice versa.

The autostereoscopic flat pixel arrangement can be designed for 3D display in a manner known per se, for example according to DE 10 2009 054 232 A1. That is, Such a flat pixel arrangement can be controlled by an image-generating unit and / or a control unit in such a way that two different 2D images reach the left and right eyes of the user in order to give him a spatial impression of the virtual display image displayed, without tools such as z. B. 3D glasses directly in front of his eyes, In this way, for example, the driver of a motor vehicle can see three-dimensional representations at any distance between about 1 m and up to an infinite distance from his eyes. Basically, all convergence levels can be implemented simultaneously, which enables immersion in a virtual 3D world.

For the described 3D operating mode, it has been directly and experimentally proven that at least for typical vehicle geometries with, for example, about 120 cm distance of the flat pixel arrangement from the eyes of the driver, the eyes are capable of accommodation from far to infinity on their own, the structures displayed as a virtual display image, such as B. lines to see essentially sharp, day and night. In other words, there is a mismatch between the convergence and accommodation distances, but this is not perceived as disturbing:

The angle of convergence is an angle formed by the visual axes of the right and left eye, and accommodation is the focus of the eye lens at a distance from the object being viewed. In normal vision (ie without a 3D display), the angle of convergence and the accommodation distance correlate accordingly a closed triangle. If the 3D distance caused by the stereoscopic image generation is in particular less than or equal to the distance of real background objects in the environment, the displayed virtual display image can be viewed relaxed and largely in focus, ie the eyes automatically set the correct 3D convergence for this (cf. 10a-10c). (The term “essentially” here can mean, in particular, a manufacturing or construction-related possible deviation within the scope of the functional principle set out, which, for example, cannot be more than about 10% of the relevant measurement parameters in question.) In particular, the provision of at least one environment parameter can include the detection of a current environment behind the projection screen, in particular an environment in front of the motor vehicle. In this case, the flat pixel arrangement is switched at least in some areas from a 3D to a monocular operating mode if the spatial depth cannot be determined in a predetermined manner in the background of the virtual display image for a corresponding area of the captured environment. For example, when the motor vehicle passes through a tunnel, over a bridge and / or behind a truck in front, it cannot be clear or unambiguous for the system and / or the user in a manner required for the 3D representation of a virtual symbol, such as deep the space in front of the motor vehicle is behind the symbol. By switching a corresponding area of the flat pixel arrangement in the monocular operating mode, a current contact-analogous position of the symbol can be maintained; the symbol is then only visible to the user's eye and therefore does not require any depth detection or adjustment of the convergence angle. Suitable agents, e.g. B. optical cameras or radar / lidar systems for detecting the environment in this and other process configurations are known to the person skilled in the art and are often already provided on board the motor vehicle.

In particular, the provision of at least one user parameter can include the detection and / or input by the user of the age and / or poor eyesight of the user. The flat pixel arrangement is switched at least in some areas from a 3D to a 2D and / or monocular operating mode if, for a corresponding area of the virtual display image, the detected and / or entered user parameters for its age and / or poor eyesight are not predetermined requirements for the 3D representation is sufficient. Alternatively or additionally, the user can also be given a direct choice between the above-mentioned operating modes via a suitable user interface.

With this design of the method, it can be taken into account, for example, that old drivers may be wearing varifocal glasses, which is possible. unlike young drivers, can lead to a mismatch of the above-mentioned convergence and accommodation distances. In this case, virtual objects that need to be seen clearly, such as B. security-relevant numbers or writing, z. B. in a 2D mode of operation in a suitable area of the planar pixel arrangement and thus the front window are displayed, so that the convergence and accommodation distances match. On the other hand, virtual objects in which such a mismatch is not very disturbing, such as. B. large area markings of lanes continue to be shown in 3D mode.

On the other hand, young drivers who normally do not have permanent drivers

Have farsightedness and for which the above-mentioned mismatch plays a minor role, also virtual 3D displays with fine structures, such as B. Font, as shown in a perceived 3D distance that is greater than the distance of the flat pixel arrangement from their eyes (such as about 1, 2 m for typical vehicle geometries), for which the convergence and Accommodation distances do not match.

Between the two extremes "young driver" and "old driver" can (but need not) any number of other suitably graded operating mode and thus presentation packages can be implemented, which can also be automatic and / or selectable by the user or driver himself , In particular, the display packages of this type can additionally implement an individual adjustment of the size of virtual fonts and / or symbols by the user.

In particular, the provision of at least one user parameter can include the detection of a viewing direction and the convergence angle of the user in relation to an object of the virtual display image shown in 3D. A region of the planar pixel arrangement corresponding to this object is switched over from a 3D to a 2D and / or monocular operating mode if the detected convergence angle deviates in a predetermined manner from a convergence angle corresponding to the 3D representation. In particular, special can be switched back to the 3D operating mode as soon as the user's gaze leaves this object. The angle of convergence can be implemented, for example, by detecting the viewing direction of both eyes of the user by eye tracking or other suitable means.

This design of the method can, for example, additionally support and / or control the adjustment of the user's eyes to a suitable convergence angle (as set out here in other places) in the 3D operating mode. For example, if the detected convergence angle mistakenly goes too close for some reason (e.g. corresponding to the distance of the planar pixel arrangement, such as 1.2 m for typical ones

Vehicle geometries), although the virtual 3D object should be seen at a greater distance, then the flat pixel arrangement can e.g. B. can be automatically switched to a monocular representation of this object so that it is also clearly and comfortably seen by the user. The monocular display can in particular be maintained until the user turns his gaze away from this displayed object and can then be switched back to the 3D display. As a result, the next time the same object is viewed, the user can again be given the opportunity to see it as intended in 3D, in that a convergence angle selected again by his brain-eye system matches the 3D object that is hidden. As a rule, the above-mentioned incorrect near focus will only be possible in the rare cases in which the user specifically switches his view directly from a display of a combination instrument inside the motor vehicle to a virtual display in order to read it even before he looks back at the road. in cases of the method in which an area of the flat pixel arrangement is switched from a 3D to a monocular operating mode, in particular a brightness per pixel for this area can be increased, for example approximately doubled, in order to reduce the intensity due to the elimination of the second To compensate at least partially for a certain amount of light. Alternatively or additionally, when switching on an area of the flat pixel arrangement in a monocular operating mode can be provided to subdivide this area into partial areas for which specific monocular operating modes are activated for different eyes of the user. In other words, some image contents are only imported for the left eye and other image contents only for the right eye of the user. In particular, this can contribute to the user not noticing the transition to monocular vision because he continues to use both eyes for the object in question. Alternatively or additionally, in the above cases of a monocular operating mode, in particular a mixed operation with a 3D operating mode can be switched on for the relevant area of the planar pixel arrangement, in which in particular large-area virtual objects (such as lane markings) continue in 3D and smaller and / or finer ones (such as an arrow in front of a tunnel wall) are presented monocularly. This can contribute to a further increased comfort of the user since large-area objects are comparatively uncritical with regard to a suitable convergence angle and the user then sees them with both eyes.

In a specific embodiment of the method of the type set forth herein, the provision of at least one environment and / or user parameter comprises the detection of an acceleration and / or a position or movement disturbance of the user and / or an acceleration and / or an

Position or movement disturbance of a moving higher-level system, in particular of the motor vehicle in which the field display device is mounted, and / or of a current environment behind the projection screen, in particular of a surrounding area of the motor vehicle. On the basis of the detected acceleration and / or position or movement disturbance of the user and / or the moving higher-level system and / or the detected current environment, a virtual display image generated by the field of view display device is stabilized in such a way that it is also able to perform rapid head and / or system movements from the user's point of view is stable in position with respect to the environment behind the projection screen. Position or movement disorders can in particular deviate from the display-relevant position or movement parameters of the user and / or the over- orderly system from the normal operation of the field of view display device, for example if an implemented eye tracking unit loses the eye position of the user.

This embodiment of the method can be applied, for example, to a contact-analogous 3D, 2D or monocular representation of a virtual display image, so that disruptions caused by rapid movements of the user relative to the environment behind the projection screen do not affect the contact-analog fade-in. By way of example only, in the case of a motor vehicle (as in the sense of any other higher-level system), the motor vehicle and its occupant who uses the field of view display device form an overall system which is subject to the following faults:

- from the outside: poor road surface leads to vehicle vibrations and additionally to vibrations of the head position relative to it;

- from the inside: the user's own head movements can also represent malfunctions.

This process design can, for. B. Implemented by means of a PID controller, in particular, an algorithm can be implemented in a control unit which determines a transmission characteristic of the overall system from the individual motor vehicle and the occupant, and in particular the D characteristic (ie the differential component that is due to changes in the interference signal reacts) so optimized that an expected change in the eye position is predicted when the motor vehicle is deflected and the display image is stabilized on the basis of this. Such a transmission characteristic of the individual overall system can in particular in advance, for. B. be determined before or at the start of a journey,

Deflections, ie accelerations of the motor vehicle can z. B. detected by a suitable acceleration sensor of a known type which is rigidly connected to the motor vehicle. In particular, navigation data available on board the motor vehicle and a vehicle orientation determined in a known manner can also be interpreted and extrapolated therefrom. How the display image input can be corrected in order to continue to appear in a contact-analogous manner in the case of a resulting eye position to be expected. The expected eye position can take into account, for example, typical head shifts during driving maneuvers such as cornering, acceleration, braking, etc., as well as typical head movements during bumps on the road. The conversion into suitable correction signals, in particular the predicted eye position, can be done e.g. B. for typical vehicle movements by means of artificial intelligence, ie with a suitable self-learning algorithm.

In a further development of the above procedure, when a predetermined interference threshold is exceeded by the detected acceleration and / or position or movement disturbance of the user and / or the higher-level system, the flat pixel arrangement is switched off for the duration of such a disturbance. With this development, in particular for very massive disturbances, to which the presented image stabilization cannot react quickly enough (such as, for example, when driving through a large pothole or a cobblestone pavement), a suitable interference threshold z. B. be stored in the control unit. The flat pixel arrangement or the entire field of view display device is deactivated for a short time, in particular for the duration of the exceeding of the predetermined interference threshold or until image stabilization has taken place, in order to avoid irritation of the user through a virtual display image that is not correctly displayed in a contact-analogous manner.

In particular, in the method of the type set out here, an object of the virtual display image to be represented in 3D can be equipped with striking vertical structures at a distance from one another which is dependent on the predetermined convergence angle in order to support the setting of a suitable predetermined convergence angle of the user's eyes (see further above) , As a result, the user's brain-eye system can be assisted in setting a suitable predetermined convergence angle, for example, by the control unit depending on the detected environment in the background, for example, its spatial depth or distance an implemented algorithm can be determined. The reason for this is that the brain is usually trained to interpret closely spaced vertical lines in single images that reach the left and right eyes as a single real object and thus adjust the angle of convergence of the eyes so that both vertical lines collapse on a single line in the 3D image composed by the brain.

According to one embodiment, the field of view display device comprises a reflection-suppressing deflection arrangement which is arranged on the flat pixel arrangement (which can in particular be designed as one or more flat screens) and which has one or more planar reflection surfaces which extend along the flat pixel arrangement at a predetermined acute angle thereto and parallel to one another (n) for projecting the generated projection light beam onto the projection screen. The rear side (s) of the one or more reflection surfaces are / are designed to be light-absorbing to suppress interference interference.

In contrast to the conventional HUD type mentioned at the outset, with a projection optic housed inside the dashboard of a motor vehicle, a field of view display device according to this embodiment has a significantly flatter design and can be installed, for example, with only a few cm installation depth in an upper side of the dashboard or subsequently mounted thereon his. This enables a significant expansion of the field-of-view of the field of view display device, for example also vertically well beyond the horizon, which is particularly suitable for contact-analogous representations for the driver and other occupants to support navigation or in autonomous driving. In particular, a real contact-analog 3D effect (stereo augmented reality) is possible, the contact-analog representation being able to be both binocular and monocular.

The plurality of mutually parallel reflection surfaces of the reflection-suppressing deflection arrangement can be of identical design to one another or can differ from one another in their shape or size. Depending on Ren shape and size of their distance from each other in a direction perpendicular to their direction of extension can be selected such that an almost complete suppression of interference and an essentially loss-free and shape-preserving deflection of the projection light beam are guaranteed. Some examples of this are given below. In principle, any known sunlight-absorbing coating is suitable for the back of the reflection surfaces, for example a mate black layer.

According to a development of this embodiment, at least one of the reflection surfaces of the reflection-suppressing deflection arrangement is formed by a lateral surface side of a prism arranged on the flat pixel arrangement. {The prism can, for example, have a triangular, quadrangular, in particular trapezoidal, or pentagonal cross-sectional area.) This can give the respective reflecting surface, in particular, high mechanical stability. The prism can be made of any transparent material for the projection light used, in particular glass or plastic. In the case of an air layer between the reflection surface and its light-absorbing rear side, the reflection can be caused by total reflection on the lateral surface side of the prism, otherwise a reflective layer, for example made of metal, can be placed thereon and a light-absorbing layer applied to it

In a specific embodiment, a light exit plane, which binds an upper edge of one reflection surface and the lower edge of the rear side of the next reflection surface, is oriented substantially perpendicular to the projection screen during operation of the field of view display device for two adjacent reflection surfaces. In particular, this can lead to complete interference suppression for ambient light from any direction.

In a specific embodiment, upper edges of the several mutually parallel reflection surfaces of the reflection-suppressing deflection From the point of view of the user essentially on a line, for example to hide the reflection surfaces against a direct view of the user. In particular, this can be adjusted manually or at least partially automatically, for example by eye tracking, by means of a suitable lifting / tilting device for the reflex-suppressing deflection arrangement or the planar pixel arrangement. To this end, the method can include the following additional steps:

- Providing a current position, in particular an eye position or a line of sight, of the user and

- The mentioned alignment of the upper edges of the several mutually parallel reflection surfaces of the reflection-suppressing deflection arrangement depending on the current user position provided.

According to a further aspect, a control unit for a field of view display device is provided, the control unit being designed for at least partially automated implementation of a method of the type set out herein. According to a further aspect, a computer program is provided which, when executed in a control unit, is set up to carry out a method of the type set out herein.

According to a further aspect, a motor vehicle is provided, comprising:

- An extending between a front window of the motor vehicle and an instru ment panel top of the instrument panel;

- A field of view display device arranged on, in or under the top of the instrument panel, which has an autostereoscopic, flat pixel arrangement for generating a projection light beam with a display content and is designed to project this onto the windshield of the motor vehicle in such a way that behind it a field of vision of the driver and / or additional occupants display a virtual display image; and

a control unit of the type set out herein.

In particular, the field of view display device can be designed according to the above embodiment and either its autostereoscopic flat pixel arrangement or the reflection-suppressing deflection arrangement arranged thereon can be arranged essentially flush with the upper side of the instrument panel of the motor vehicle.

Brief description of the drawings

The above aspects of the invention and its embodiments and specific configurations are explained in more detail below with reference to the examples shown in the accompanying drawings. The drawings are purely schematic, in particular they should not be read to scale. Similar or corresponding elements are provided with the same reference symbols. Show it:

Figure 1 is a schematic side cross-sectional view of a field of view display device according to the above embodiment of the inven tion;

Figure 2a is a perspective view of a possible extension of a

Field of view display device according to the above embodiment in an upper side of an instrument panel of a motor vehicle;

FIGS. 2b and 2d each show a perspective view of a projection area in the front window of the motor vehicle that can be used with the field of view display device of FIG. 2a;

FIG. 2c shows a perspective view of a projection area in the front window of the motor vehicle that can be used with the field of view display device from FIG. 2a;

Figures 3a to 3c perspective views of a model example of a field of view display device according to the above embodiment Explanation of the deflection effect of its reflex-suppressing deflection arrangement with several prisms;

FIGS. 4a and 4b are perspective views of a further model example of a field of view display device according to the above embodiment to explain the formation of visible and invisible strips in a surface containing the planar pixel arrangement;

Figure 5a is a perspective view of a possible arrangement of a

FIG. 5b shows a perspective view of a projection area in the front window of the motor vehicle that can be used with the field display device of FIG. 5a, from the driver's point of view with a virtual turn arrow faded in in a contact-analogous manner;

Figure 6 is a schematic side cross-sectional view of a field of view display device according to the above embodiment with control components for their planar pixel arrangement for carrying out the method of the type set out herein;

FIG. 7 shows a perspective front window view from the driver's perspective with a virtual marking of a third-party vehicle faded in with the field of view display device of FIG. 6;

FIG. 8 shows a further perspective front window view from the driver's perspective with a virtual marking of a lane faded in contact-analogously with the field-of-view display device of FIG. 6 and a further virtual display content faded in statically by means of an additional conventional projection unit; Figures 9a and 9b schematic side cross-sectional views of other

Field of view display devices according to the above embodiment; and

FIGS. 10a to 10c each have a look through a projection screen with a virtual marker arrow that is displayed in a contact-analogous manner in the 3D operating mode of the planar pixel arrangement and which appears sharply and as a real 3D object to a user of the field of view display device at three very different distances of the background objects.

Description of embodiments

All of the specific details and variants of the operating method for a mentioned above and below in the description and the claims

Field of view display device according to the first aspect of the invention, in particular various design features of the relevant field of view display device according to the above embodiment, can be implemented in the examples shown in FIGS. 1 to 10c. Conversely, the specific examples shown in FIGS. 1 to 10c are only to be understood as a simplified, exemplary illustration of the features more generally defined in the description and the claims.

Fig. 1 shows a highly simplified schematic vertical cross-sectional view of a field of view display device 1 according to the above embodiment of the invention in a motor vehicle (not shown in Fig. 1, see Figs. 2a-2d and 5a-5b), in particular a head-up display.

The field of view display device 1 comprises an electrically controllable autosteoscopic planar pixel arrangement 2, which generates a projection light beam L with a desired display content during operation. Furthermore, the field of view display device 1 comprises a surface area arranged on the flat pixel arrangement 2. Orderly reflex-suppressing deflection arrangement 3, which in this example has a plurality (purely by way of example five) of flat reflection surfaces 4 extending along the flat pixel arrangement 2 at a predetermined acute angle thereto and parallel to one another a windshield 5 of the motor vehicle is projected and reflected by it towards the eyes of a user 6, in particular the driver or front passenger (indicated by arrows). This creates a virtual display image (see FIGS. 5b, 7 and 8) which is superimposed on the field of view of the user 6 behind the front window 5 and overlays for the user 6 with a real environment in front of the motor vehicle observed through the front window 5. For this purpose, the predetermined acute angle of attack of the reflection surfaces 4 can be determined in an application-specific manner, for example from the mutual geometric arrangement of the flat pixel arrangement 2, the front screen 5 and the user 6. The reflective surfaces 4 on their rear sides 11 are designed to be light-absorbing over the entire surface to suppress interference reflections.

The field of view display device 1 can be mounted, for example, in or on an upper side 7 of an instrument panel 8 (not shown in FIG. 1, cf. FIGS. 2a-2d and 5a) of the motor vehicle between the front screen 5 and the instrument panel 8 or a steering wheel. The flat pixel arrangement 2 or the reflection-suppressing deflection arrangement 3 can be arranged, at least in sections, for example essentially flush with the upper side 7 of the instrument panel 8, which can be particularly inconspicuous, protect the optical components or the user 6 and / or save space.

In Fig. 1, purely by way of example, all reflection surfaces 4 of the reflection-suppressing deflection arrangement 3 are formed by lateral surface sides of glass or plastic prisms 9 resting on the flat pixel arrangement 2. This can result in a particularly robust construction of the field of view display device 1 and protect both the flat pixel arrangement 2 and the reflection surfaces 4 from damage and also the user 6 from injuries on free-standing edges. In particular, the free-standing, upper prism men edges 10 additionally rounded or chamfered and in particular also be designed to be light-absorbing, for example in a manner similar to the back of the reflection surfaces and for the same purpose,

In particular, the respective prism 9 in FIG. 1 has a triangular cross-sectional area A, so that its other, lower lateral surface side 9a rests on the flat pixel arrangement 2, while its third lateral surface side serves as a light exit surface 13a for the redirected projection light bundle L. The light exit surfaces 13a can in particular be provided with a suitable anti-reflective coating from the outside, in FIG. 1 the lateral surface sides 9a of the prisms 9 resting on the flat pixel arrangement 2 directly adjoin one another purely by way of example.

In the geometrical arrangement of the reflection surfaces 4 shown in FIG. 1, their light-absorbing rear sides 11 in particular can be used to almost completely suppress interference reflections of the ambient light 12 from any direction from outside and inside the motor vehicle, as symbolically in FIG. 1 by an area free of interference reflections 6a indicated around the user 6. For this purpose, for example, light exit planes 13, which connect an upper edge of one reflection surface and the lower edge of the rear side 11 of the next reflection surface for two adjacent reflection surfaces 4 and in which, in this example, the light exit surfaces 13a of the prisms 9 lie, are essentially perpendicular be aligned with the front screen 5. In particular, in this example the reflection surfaces 4 and their light-absorbing rear sides 11 lie with their lower edges directly on the flat pixel arrangement 2, which can also include a protective cover layer, etc. if required.

Furthermore, in FIG. 1, a front reflection surface 4 closest to the user 6 is covered by a darkened or light-absorbing cover surface 14 in the viewing direction of the user 6 to prevent glare to the user. In this example, the cover surface 14 covers a lateral surface side of the front prism 9 facing the user 6. The same coating is particularly suitable for the cover surface 14, for example a black matt coating, as in the case of the light-absorbing rear sides 11 of the reflection surfaces 4. Alternatively, a separate cover surface 4 arranged in the direction of the user in front of the front reflection surface 4 can also be provided for the same purpose , so that said reflection surface 4 can be used to deflect the projection light.

The Wetteren in Fig. 1, upper edges of the reflection surfaces 4 purely at play essentially on a line K from the perspective of the user 6 of the

Field of view display device 1.

FIG. 2a schematically shows a perspective view of a possible extension of a field of view display device 1 according to the above embodiment of the invention, in particular according to FIG. 1, in an upper side 7 of an instrument panel 8 of a motor vehicle 15. An overall height of the field of view display device 1 in a flat pixel arrangement 2 vertical direction can in particular only a few cm, for example between 0.5 and 10 cm, in particular between 1 and 7 cm, z. B. be about 2, 3, 4, 5 or 6 cm. Due to a correspondingly small installation depth of the field of view display device 1, it can in principle occupy an entire surface of the upper side 7 of the instructing board 8 of the motor vehicle 15 in front of the windshield 5, as indicated in FIG. 2a by its possible contour 1a. For comparison, a light exit opening 16 and its edge 16a are indicated in FIG. 2a in a conventional projection unit of an HUD mentioned at the beginning with projection optics (not shown) accommodated below the top side 7 of the instrument panel 8.

2b and 2d each schematically show a perspective view of a projection area 17 of the front screen 5 of the motor vehicle 15 that can be used with the field of view display device 1 of FIG. 2a, the limitation 17a of which corresponds to the contour 1a of the field of view display device 1. Again, for comparison, there is a projection area 19 corresponding to the light exit opening 16 of a conventional projection unit and its boundary 19a indicated. In contrast to this, the projection area 17 that can be used with the field of view display device 1 can be seen to extend clearly above the horizon, and can also cover a large part of the side of the road area to be surveyed by the driver in front of the windscreen 5.

Fig. 2c schematically shows a perspective view of a usable with the field of view display device 1 of Fig. 2a projection area 18 of the front window 5 of the motor vehicle 15 from the passenger's perspective, the boundary 18a of the contour 1 a of the field of view display device 1 corresponds. As can easily be seen from this, the effects of the field of view display device 1 mentioned above for the driver can also be used just as well for the front passenger. The same applies correspondingly to other occupants of the motor vehicle 15, for example from a lounge position in the rear. Overall, multi-user use is therefore possible with the field of view display device 1. If the content is to be seen by only one user, the pixel matrix of the planar pixel arrangement 2 is to be controlled by evaluating eye tracking for all users to be considered so that the image can only be seen by the user in question.

Figures 3a to 3c show, each in perspective view, a greatly simplified model example for a field of view display device 1 according to the above embodiment (for example, according to FIG. 1) to explain the deflecting effect of its anti-reflective deflection arrangement 3, the reflection surfaces 4 in this model rear lateral surface sides of two prisms 9 with triangular cross-sectional areas A facing away from the viewer or user are formed.

In this model example, the flat pixel arrangement 2 is designed as a flat screen which generates a desired display content, in this example the two-dimensional image of a butterfly shown in FIG. 3a, which bundles L of projection light rays emanating from the flat screen (see FIG. 1). is transported. When passing the reflection-suppressing deflection arrangement 3 arranged on the flat pixel arrangement 2 the projection light beam L is deflected on the reflection surfaces 4 of the rear lateral surface sides of the prisms 9 in order, for example, as in FIG. 1 on the front screen 5 of the motor vehicle and reflected by it to reach the eyes of the user 6.

As can be seen in FIG. 3b, the projection light beam L coupled in through the lower lateral surface sides 9a of the prisms 9 emerges from their light exit surfaces 13a, while the rear sides 11 of the reflection surfaces 4 are formed to absorb interference reflection for the ambient light. As FIG. 3c shows, the projection light beam L coupled into the reflex-suppressing steering arrangement 3 leaves the light exit surfaces 13a of the prisms 9 essentially without loss of sanctity and with a suitable control of the flat pixel arrangement 2, as in FIG. 3a, also without loss of shape.

4a and 4b each show a perspective view of another greatly simplified model example of a field of view display device 1 according to the above embodiment (for example according to FIG. 1) to explain the formation of visible and invisible stripes in an area containing the flat pixel arrangement 2. Similar to FIGS. 3a-3c, the flat pixel arrangement 2 is also designed here as a flat screen which contains a desired display. in this example, the two-dimensional image of a butterfly shown in FIG. 4a. Also in this model example, the reflection-suppressing deflection arrangement 3 arranged on the flat pixel arrangement 2 is formed by prisms 9 lying on the flat screen and adjoining one another with their long sides, of which only two of possible more than two are also here for the sake of simplicity Prisms are shown.

As indicated in Fig. 4a and 4b, extend in the pixel area to the reflection surfaces 4 of the prisms 9 parallel strips 21, which by deflecting the projection light on the reflection surfaces 4 from here up to five identical prisms 9 visible to the user Biickfeldanzeigevorrich- tion 1 can be made. In between are strips 22 invisible to the user of the field of view display device 1.

The invisible strips 22 can therefore be left black in the pixel arrangement or can be used for other functions, for example as an air outlet for a windscreen heater or interior ventilation, as an opening for a sound source, as a light source for diffuse interior lighting or as an overlap area for boxes or steps Adjacent sub-areas of a composite flat pixel arrangement.

In particular, for example in Fig. 1, a first, most distant from the user 6 reflection surface 4 without a prism placed directly under a root of the windshield 5 of the motor vehicle and thus on mechanically as well as free standing reflection surfaces as well as possible user injuries be protected. As an alternative to omitting a prism 9, with this and / or other reflection surfaces 4 (and not only in this example) prism edges, which lie opposite the respective reflection surfaces 4, in an area corresponding to the invisible strips 22, which is not passed by the projection light beam bundle L, be cut off. As a result, the invisible strips 22 can, for example, be used for other purposes, and / or the weight and material consumption of the reflex-suppressing outer arrangement can be reduced.

5a shows a perspective view of a possible arrangement of a field of view display device 1 according to the above embodiment (for example according to FIG. 1) in a top side 7 of an instrument panel 8 of a motor vehicle 15. Because of its flat construction, the field of view display device 1 can extend along the top side 7 of the instrument panel 8 extend clearly beyond the edge 16a of a light exit opening 16 of a projection unit of the conventional HUD type described at the outset, which is indicated for comparison in FIG. 5a. As described above for FIG. 2a, the field of view display device 1 can take up to the entire area of the upper side 7 of the instrument panel 8. In FIG. 5 a, a flat pixel arrangement 2 of the field of view display device 1 takes up a partial area of the top side 7 of the instrument panel 8 of the motor vehicle 15 in front of the front window 5, which is delimited purely by way of example by a square contour 1 a. The flat pixel arrangement 2 can in particular be designed as one or more 2D or 3D flat screens arranged next to one another in a flat or nested or stepped manner. In the direction of the front screen 5, the flat pixel arrangement 2 is covered by a reflection-suppressing Umlenkanord voltage 3, the plurality of mutually parallel reflection surfaces 4 and the light-absorbing rear sides 11 are indicated by parallel lines.

FIG. 5 b shows the projection area 17 in the front screen 5 that can be used with the field of view display device 1 of FIG. 5 a, the boundary 17 a of which corresponds to the contour 1 a of the field of view display device 1. The projection area 17 extends upwards clearly beyond the horizon and also covers laterally several lanes of the road area in front of the motor vehicle 15 to be surveyed by the driver. Because of the correspondingly large solid angle or field-of-view of the field of view display device 1, it is particularly well suited for contact-analogous insertion of virtual auxiliary content into the driver's field of view depending on the real environment 20 in front of the motor vehicle 15. In particular, the field of view display device 1 Real contact analogue 3D effect (stereo augmented reality) possible:

Fig. 6 shows a schematic side cross-sectional view of a field of view display device 1 according to Fig. 1 and Fig. 2a or 5a, the autostereoscopic flat pixel arrangement 2, for example, a bright display 2a, z. B. a liquid crystal screen or any other standard display that can also be used with the conventional HUD, as well as a microlens array 2b or other deflecting means according to DE 10 2009 054 232 A1, which deflect light rays of different luminous points of the display 2a into different radiation directions, having. A control unit 24 for the display 2a and the microlens array 2b is also provided in a manner known per se for controlling the flat pixel arrangement 2 to generate a contact-analog 3D effect for the user 6. The control unit 24 can, for example, receive display content to be displayed as a virtual display image from an image generation unit 23. The image generation unit 23 can in particular be designed to calculate a suitable stereoscopic display of environment objects to be displayed for the user 6 and for this purpose, for example, from an environment of the acquisition unit 26 current environment 20 of the motor vehicle 15 and / or from an eye tracking unit 25 which, for. B. can include one or more cameras, get a current eye position of the user 6. The respective signal lines are indicated by arrows in FIG. 6.

The control unit 24 is designed in cooperation with the image generation unit 23 to carry out the method of the type set out herein in all of its configurations set out herein. That is, it is designed for switching the autostereoscopic flat pixel arrangement 2 between qualitatively different operating modes, in particular for the transition from a 3D to a 2D or to a monocular representation of a virtual object and vice versa. The environment and / or user parameters required for this are provided in this example by the environment detection unit 26, the eye tracking unit 25 and other suitable sensors and systems known per se on board the motor vehicle 15.

10a-10c show a typical example of how the eyes of a user automatically set a correct convergence angle (see above) for a 3D object which is displayed in a contact-analogous manner with an autostereoscopic flat pixel arrangement of a field of view display device (not shown), here a marking arrow 32.

In the case shown, the 3D distance of the faded-in object is adapted to the distance of the background. This helps the eyes to automatically set the intended and correct angle of convergence. 10a-10c each show a view through a projection screen 33 inclined from the vertical, the virtual marking arrow 32 generated in a 3D operating mode of the flat pixel arrangement at three very different distances of the background objects from the eyes of the user - in FIG. 10a a concrete pillar 34 at a distance of 2 m; in Fig. 10b a forest 35 1000 m away; in Fig. 10c a house 36 at a distance of 70 m - appears equally sharp to the user and appears as a real 3D object. A single eye has a large depth of field: the superimposed object (marker arrow 32) and the distant background object (concrete pillar 34, forest 35 or house 36) are seen in sharp focus in each of these three cases, although in all three cases the convergence angle is not the actual one Distance of the arrow from the eye to the pixel matrix (approx. 1.2 meters) corresponds.

Further developments of the method of the type set out herein for operating a field of view display device 1 according to FIG. 6 are described with reference to FIGS. 5b, 7 and 8. (The contents 29, 30 and 31 shown in FIGS. 7 and 8 as virtual display images have no border lines, rather the indicated border lines only serve to clarify the reader.)

In one variant of the method, the environment detection unit 26 detects an environment 20 of the motor vehicle 15 that is currently located behind the windshield 5. Depending on the detected environment 20, information such as virtual object images and / or object markings are provided in the field of vision of the user 6, in particular the driver of the motor vehicle 15, to support the user 6 when navigating during independent or assisted driving or to visualize / clarify one of the Motor vehicle 15 detected driving situation and its driving intent during highly or fully automated driving (HAF / VAF) is faded in. In FIG. 5b, a virtual turning arrow 27 is faded in into the correct turning point of the road ahead in FIG Darkness detected third-party vehicle 28 in front of one's own motor vehicle 15 with a colored, for example red circle 29 virtually visibly marked, and in Fig. 8 on a road without lane markings a correct lane in front of one's own Motor vehicle 15 visualized by a continuous colored, for example yellow, virtual lane marking 30 in the form of the entire lane to be driven.

A further variant of the method which can be combined with the above is described with reference to FIG. 8. Here, according to a so-called “hybrid approach”, the field of view display device 1 also comprises, in addition to the flat pixel arrangement 2 and the reflection-suppressing deflection arrangement 3, a conventional projection unit of the type mentioned at the beginning (not shown) for generating a further virtual display image 31 that is shown in a field of view of a user 6.

In this hybrid approach, the flat pixel arrangement 2 with the reflection-suppressing deflection arrangement 3 arranged thereon in the upper side 7 of the instrument panel 8 of the motor vehicle 15, for example, as indicated in FIG. 5a, next to the light exit opening 16 of the projection unit, in particular directly adjacent to it or around it, be arranged. In particular, however, the light exit opening 16 of the projection unit - at which it is shown in FIG. 5 a for its conventional position - can be arranged closer to the root of the front pane 5 and adjacent to the lower contour side of the flat pixel arrangement 2 in FIG. 5 a and in a horizontal direction 5a so as to be used to display the further virtual display image 31 deeper below the horizon, for example directly below the contact-analog virtual display image generated by the flat pixel arrangement 2.

This conventional projection unit comprises in its interior both an imaging unit for generating a further projection light beam with the display content of the further virtual display image 31 and a projection lens arranged opposite the imaging unit for projecting the generated further projection light beam onto a partial surface of the front screen 5 conventional HUD technology can be combined with the above in order to simultaneously or depending on the situation to be used alternately. The method can in particular include the further steps:

- Providing system status data of the motor vehicle 15 and / or providing route data for a route section ahead; and

- Static, in particular independent of real objects behind the front screen 5 in the representation, fading in predetermined information into the field of vision of the user 6 via the projection unit and / or the at least one autostereoscopic screen and / or the at least one 2D screen of the flat pixel arrangement 2 depending on the system status data and route data provided.

The predetermined static information can be, for example, warning messages in the event of a critical charge state of an energy store or a critical fill state of a fuel tank on board or an emerging storm, or an indication of a current speed limit or its exceeding, etc.,

9a-9b each show in a schematic vertical cross-sectional view further specific configurations of the field of view display device 1 according to the above embodiment. The reflection-suppressing deflection arrangement 3 of FIGS. 9a-9b differs from that of FIGS. 1 and 6 in that it only has a single large reflection surface 40 (FIG. 9a) or a plurality of reflection surfaces 4 with mutually varying heights perpendicular to the flat pixel arrangement 2 (FIG 9b).

With the field of view display device 1 shown in FIG. 9a with a single large, for example approximately 6 cm (in the direction perpendicular to the planar pixel arrangement 2) high reflection surface 40, a field-of-view can already be achieved which is comparable in the vertical direction to that mentioned at the beginning conventional HUD in today's motor vehicles. At the same time, however, the field of view display device 1 of FIG. 9a can be designed to be significantly wider than the conventional HUD in the horizontal direction due to its flat structure be, which overall can result in a correspondingly larger field-of-view. It is possible, but not absolutely necessary, for the reflection surface 40 to be formed by a side surface of a prism 9. Instead, the reflection surface 40 can also simply be an inclined mirror with a thickness required for its stability and the freedom from injury of a user, because this thickness has no influence on the virtual display image generated. This also applies to the reflection surface 4 closest to the front pane 5 in FIGS. 1 and 6. As in FIGS. 1 and 6, in FIG. 9a, compared to the reflection surface 40 for suppressing interference reflection, a dummy with a user 6 is shown facing light-absorbing cover surface 14 and a light-absorbing back 11 parallel to the reflection surface 40.

In FIG. 9b, the same can apply to the first from the left reflection surface 4, which is arranged, for example, in a motor vehicle closest to the front window 5 thereof, as for the reflection surface 40 of FIG. 9a. A further field-of-view of the field of view display device 1, which is even larger than that of FIG. 9a, can be achieved by means of further reflection surfaces 4, which are successively reduced in height and, as shown in FIG. 9b, by prisms 9 of different heights.

9a and 9b successively decreasing heights of the reflection surfaces 40, 4 and the rear sides 11 thereof, the upper edges of a line K leading to the eyes of the user 6 can also be shown, for example in relation to FIG the top 7 of the

Instrument panel 7 of the motor vehicle be aligned.

In the method of the type set out here, in particular in the field of view display devices shown in FIGS. 1 to 9b, a flat pixel arrangement 2, which in addition to an autostereoscopic one additionally has a 2D image stream, can provide a virtual display image at a fixed distance of slightly below or above one Meters, for typical motor vehicle dimensions about 1, 2 m, generated by the user 6. Without eye tracking Tet must be z. B, as a replacement for a conventional instrument cluster display, information such as the condition of the vehicle is permanently displayed. In principle, however, it can also be used to display all other types of information, in particular contact-analog overlays in the detected environment behind the projection screen, which were mentioned here in relation to a 3D display.

List of reference numerals for field display device

a Contour of the field display device in an upper side of an instrument panel

autostereoscopic planar pixel arrangement

a display

b microlens array

reflex-suppressing deflection arrangement

, 40 mutually parallel, inclined reflection surfaces of the reflection-suppressing deflection arrangement

windscreen

User of the field of view display device

Top of the instrument panel

Instrument panel of a motor vehicle

prism

a lower surface of a prism

0 upper prism edge

1 light-absorbing rear sides of the reflection surfaces of the reflection-suppressing deflection arrangement

2 ambient light

3 light exit plane (s) of the reflection-suppressing deflection arrangement 3a light exit surface of a prism

4 cover surface

5 motor vehicle

6 light exit opening of a conventional HUD projection unit 6a edge of the light exit opening

7 Projection area of the field of view display device in the front window from the driver's perspective 17a Limitation of the projection area from the driver's point of view

18 Projection area of the field of view display device in the front window from the passenger's perspective

18a Limitation of the projection area from the passenger's point of view

19 Projection area of a conventional HUD projection unit

19a Limitation of the projection area of the conventional HUD projection unit

20 surrounding or behind the projection screen

21 visible stripes

22 invisible stripes

23 image generation unit

24 control unit

25 Eye-T racking unit

26 environment detection unit

27 Turn-on arrow displayed analogously to the contact

28 registered third-party vehicle in front of the own motor vehicle

29 Marking of the registered third-party vehicle displayed in a contact-analogous manner

30 lane marking superimposed on the contact

31 statically superimposed further virtual display image of an additionally provided conventional HUD projection unit

32 contact arrow displayed

33 projection screen inclined from the vertical

34 concrete pillars

35 forest

36 house

L projection light beam

Ä Cross-sectional area of a prism

K Line from the user's point of view, on which the upper edges of the several reflection surfaces lie

Claims

Expectations

1 . Method for operating a field display device (1), in particular for a motor vehicle (15), which has an autostereoscopic planar pixel arrangement (2) for generating a projection light beam (L) with a display content and is designed to be partially transparent reflective projection screen, in particular a front screen (5) of the motor vehicle (1 5). to project in such a way that a virtual display image (27, 29, 30, 32) which is faded into a field of vision of a user (6) is created,

the method comprising the following steps:

Providing at least one environment and / or user parameter and

Switching between at least two qualitatively different 3D and / or 2D and / or monocular operating modes of the flat pixel arrangement (2) depending on the environment and / or user parameters (s) provided to adapt the virtual display image (27, 29, 30, 32) of qualitative operational changes in relation to the environment and / or the user (8) of the field of view display device (1).

2. The method according to claim 1, wherein

the provision of at least one environment parameter includes the detection of a current environment behind the projection screen, in particular an environment (20) in front of the motor vehicle (15), and

the flat pixel arrangement (2) is switched at least in some areas from a 3D to a monocular operating mode if, for a corresponding area of the detected environment, due to the virtual display image (27, 29, 30, 32) the spatial depth cannot be determined in a predetermined manner.

3. The method according to claim 1 or 2, wherein

the at least one user parameter includes the detection and / or user input of its age and / or poor eyesight and

the flat pixel arrangement (2) is switched at least in some areas from a 3D to a 2D and / or monocular operating mode when the captured and / or entered user parameters for a corresponding area of the virtual display image (27, 29, 30, 32) Age and / or requirements for the 3D display that are not predetermined for poor eyesight are sufficient.

4. The method according to any one of the preceding claims, wherein

the provision of at least one user parameter includes the detection of its viewing direction and its convergence angle in relation to an object of the virtual display image (27, 29, 30, 32) shown in 3D and

a region of the flat pixel arrangement (2) corresponding to this object is switched from a 3D to a 2D and / or monocular operating mode, provided that the detected convergence angle of the user deviates in a predetermined manner from a convergence angle corresponding to the 3D representation, and preferably is switched back to the 3D operating mode as soon as the detected line of sight leaves this object again.

5. The method according to any one of the preceding claims, wherein when switching an area of the planar pixel arrangement (2) from a 3D to a monocular operating mode, a brightness for this area is increased, in particular doubled, and / or partial areas of this area in for different eyes of the User (6) certain monocular operating modes are switched; a mixed operation of a 3D operating module with a monocular operating mode is preferably switched on, in which in particular large-area virtual objects are displayed in 3D and smaller and / or finer virtual objects are displayed monocularly.

6. The method according to any one of the preceding claims, wherein

the provision of at least one environment and / or user parameter, the detection of an acceleration of the user (8) and / or a moving superordinate system, in particular of the motor vehicle (15) in which the field of view display device (1) is mounted, and / or a position or movement disturbance of the user (6) and / or the higher-level system and / or a current environment behind the projection screen and based on the detected acceleration and / or position or movement disturbance of the user (6) and / or the higher-level system and / or the detected current environment, a virtual display image (27, 29, 30, 32) generated by the field of view display device (1) is stabilized in such a way that it is positionally stable with respect to the user (6) even with rapid head and system movements the environment behind the projection screen is generated, wherein when a predetermined interference threshold is exceeded by the detected Bes acceleration and / or position or movement disturbance of the user (6) and / or the higher-level system, the flat pixel arrangement (2) is preferably switched off for the duration of such a disturbance.

7. The method according to any one of the preceding claims, wherein to support the setting of a suitable predetermined convergence angle, an object of the virtual display image (27, 29, 30, 32) shown in 3D with striking vertical structures at a distance dependent on the predetermined convergence angle generated becomes.

8. The method according to any one of the preceding claims, wherein the field of view display device (1) on the flat pixel arrangement (2), which is in particular designed as at least one flat screen, arranged reflex-suppressing deflection arrangement (3) which has one or more standing along the flat pixel arrangement (2) at a predetermined acute angle to it and parallel planar reflecting surface) (4, 40) for projecting the generated projection light beam (L) onto the projection screen,

wherein the one or more reflective surface (s) (4, 40) on their rear side (s) (1 1) is / are designed to suppress interference reflections in a light-absorbing manner.

9. The method of claim 8, wherein

at least one of the reflection surfaces (4, 40) of the reflection-suppressing deflection arrangement (3) through a lateral surface side of a prism (9) arranged on the flat pixel arrangement (2), for example with a triangular, square, in particular trapezoidal, or pentagonal cross-sectional area (A), is formed.

10. The method according to claim 8 or 9, wherein

For two adjacent reflection surfaces (4), a light exit plane (13), which connects an upper edge of one reflection surface (4) and the lower edge of the rear side (11) of the next reflection surface (4), essentially when the field of view display device (1) is in operation is aligned perpendicular to the projection screen.

1 1. The method according to any one of claims 8 to 10, wherein upper edges of the plurality of mutually parallel reflection surfaces (4) of the reflex suppressing deflection arrangement (3) from the point of view of the user (6) lie essentially on a line (K), in particular by the steps:

Providing the user (6) with a current position, in particular an eye position or a viewing direction, and aligning upper edges of the several mutually parallel reflection surfaces (4) in Basically in a line (K) leading to the eyes of the user (6) depending on the current user position provided.

12. Computer program, which, when executed in a control unit (24), is set up to carry out a method according to one of the preceding claims.

13. Control unit (24) for a field display device (1), the control unit (24) being designed to automatically carry out a method according to one of claims 1 to 11.

14. Motor vehicle (15) comprising:

an upper side (7) of the instrument panel, which extends between a front screen (5) of the motor vehicle (15) and an instrument panel (8);

one on, in or under the top (7) of the instrument panel (8) on arranged field of view display device (1), which has an autostereoscopic flat pixel arrangement (2) for generating a projection light beam (L) with a display content and is designed to do so to project onto the front screen (5) of the motor vehicle (15) in such a way that a virtual display image (27, 29, 30, 32) which is faded into a field of vision of the driver and / or other occupants is created; and

a control unit (24) according to claim 13;

wherein preferably the flat pixel arrangement (2) or a reflection-suppressing deflection arrangement (3) arranged thereon, for projecting the generated projection light beam (L) onto the front screen (5) one or more along the flat pixel arrangement (2) at a predetermined acute angle thereto and parallel to each other extending flat reflecting surface (s) (4, 40) with a light-absorbing rear (s) (11), is arranged essentially flush to the top (7) of the instrument panel (8).