DE102017202228A1 - An automotive head-up display device, method, apparatus and computer readable storage medium having instructions for controlling a display of a head-up display device - Google Patents

Abstract

A head-up display device (2) for a motor vehicle and a method, a device and a computer-readable storage medium with instructions for controlling a display of a head-up display device (2) for a motor vehicle. The head-up display device (2) for comprises an imaging unit (3) and an optical module for projecting an image generated by the imaging unit (3) onto a projection surface (5). The optical module has at least a first optical path (6) and a second optical path (7) for the projection of the image generated by the imaging unit (3) onto the projection surface (5). Between the two optical paths (6, 7) can be switched.

Description

The present invention relates to a head-up display device for a motor vehicle. The invention further relates to a method, a device and a computer-readable storage medium with instructions for controlling a display of a head-up display device for a motor vehicle and a motor vehicle in which a head-up display device according to the invention, a method according to the invention or a device according to the invention is used.

A head-up display or a head-up display device is understood to be a display system in which the user can maintain his viewing direction, since the contents to be displayed are faded into his field of vision. While such systems were initially primarily used in aviation due to their complexity and cost, they are now also being mass-produced in the automotive sector.

A head-up display for a motor vehicle is for example in the document DE 102014211339 A1 described. The head-up display uses an optical diode, which allows the transmission of light in the direction of the windshield while preventing disturbing reflections. The optical diode consists of a polarization-dependent mirror, an optical retarder plate and another mirror.

In general, head-up displays consist of an imaging unit, an optical module and a projection surface. The imaging unit creates the image. The optical module images the image onto the projection surface. This surface is a partially reflective, translucent disc. The user thus sees the content presented by the imaging unit and at the same time the real world behind the screen. In the automotive sector, the front screen, whose curved shape must be taken into account in the illustration, often serves as the projection surface. As an alternative, an additional disc made of glass or plastic is used in part, which is arranged between the driver and the windshield on the dashboard.

Increasingly, attempts are being made to use head-up displays or their components for other applications. In this context, the document describes US 2015/0268466 A1 a head-up display for a motor vehicle, in which a light source is used both for the generation of a virtual image on the head-up display as well as for the generation of a real image on a combination instrument. Between the two displays is switched manually or, for example, based on the vehicle speed. For this, the complete light source is tilted accordingly.

Head-up display devices present the information at a fixed distance from the viewer, i. the distance of the virtual image to the viewer is fixed. In order to make head-up display devices usable in the future for augmented reality (AR) applications, this distance will be increased by about 2m to distances ≥ 7.5m. This increase in the distance of the virtual image can lead to the problem that a real object is closer to the viewer than the virtual representation of the head-up display device. This superimposition of the representation with the reality can lead to the observer to irritations. To avoid this, head-up display systems with two imaging units are used, each of which uses an optical path for a near and a distant image plane.

Against this background, the document describes DE 102008044334 A1 a head-up display device for a motor vehicle. The head-up display device uses two separate imaging units to generate virtual images at different distances to the viewer by means of light paths of different lengths. With the help of an optical switching device can be changed between the two imaging units. The optical switching device uses a polarization beam splitter and a polarization rotating element to influence the polarization of the light emanating from one of the two imaging units.

It is an object of the invention to provide improved solutions for a head-up display device for a motor vehicle and the control of a display of a head-up display device for a motor vehicle, which can be realized at a lower cost.

This object is achieved by a head-up display device for a motor vehicle according to claim 1, a method having the features of claim 7, by a device having the features of claim 10 and by a computer-readable storage medium having instructions according to claim 13. Preferred embodiments of the invention are the subject of the dependent claims.

According to a first aspect of the invention, a head-up display device for a motor vehicle has an imaging unit and an optical module for projecting an image generated by the imaging unit onto a projection surface. The optical module has at least a first one optical path and a second optical path for the projection of the image generated by the imaging unit on the projection surface, wherein between the two optical paths can be switched.

• – Bestimmen einer gewünschten Bildebene für ein von einer bildgebenden Einheit der Head-up-Display-Vorrichtung erzeugtes Bild; und
• – Einstellen eines optischen Pfades der Head-up-Display-Vorrichtung entsprechend der gewünschten Bildebene für eine Projektion des von der bildgebenden Einheit erzeugten Bildes auf eine Projektionsfläche.

According to another aspect of the invention, a method of controlling a display of a head-up display device for a motor vehicle comprises the steps of:

• Determining a desired image plane for an image generated by an imaging unit of the head-up display device; and
• - Setting an optical path of the head-up display device according to the desired image plane for a projection of the image generated by the imaging unit on a projection screen.

• – Eine Datenverarbeitungseinheit zum Bestimmen einer gewünschten Bildebene für ein von einer bildgebenden Einheit der Head-up-Display-Vorrichtung erzeugtes Bild; und
• – Eine Steuerungseinheit zum Einstellen eines optischen Pfades der Head-up-Display-Vorrichtung entsprechend der gewünschten Bildebene für eine Projektion des von der bildgebenden Einheit erzeugten Bildes auf eine Projektionsfläche.

According to a further aspect of the invention, a device for controlling a display of a head-up display device for a motor vehicle comprises:

• A data processing unit for determining a desired image plane for an image generated by an imaging unit of the head-up display device; and
• - A control unit for adjusting an optical path of the head-up display device according to the desired image plane for a projection of the image generated by the imaging unit on a projection screen.

• – Bestimmen einer gewünschten Bildebene für ein von einer bildgebenden Einheit der Head-up-Display-Vorrichtung erzeugtes Bild; und
• – Einstellen eines optischen Pfades der Head-up-Display-Vorrichtung entsprechend der gewünschten Bildebene für eine Projektion des von der bildgebenden Einheit erzeugten Bildes auf eine Projektionsfläche.

In accordance with another aspect of the invention, a computer-readable storage medium includes instructions that, when executed by a computer, cause the computer to perform the following steps to control a display of a head-up display device for a motor vehicle:

• Determining a desired image plane for an image generated by an imaging unit of the head-up display device; and
• - Setting an optical path of the head-up display device according to the desired image plane for a projection of the image generated by the imaging unit on a projection screen.

The term computer is to be understood broadly. In particular, it also includes controllers and other processor-based data processing devices.

According to the invention, the head-up display device uses only one imaging unit. Nevertheless, in order to realize different distances of the virtual image to the viewer, the optical path in the optical module can be modified. For this purpose, the optical module has two or more optical paths for the projection of the image generated by the imaging unit onto the projection surface, between which can be switched. Different optical path lengths of the light within the different optical paths result in different distances of the virtual image, depending on the selected imaging property of the optical system. The components for switching between the optical paths are considerably less expensive than the use of two or more imaging units. The inventive head-up display device can therefore be realized with lower costs.

According to one aspect of the invention, the optical module has a controllable mirror for switching between the optical paths. For example, the controllable mirror in a beam path in the optical module can be introduced or displaced in the beam path. The introduction of the mirror can e.g. by a displacement or rotation of the mirror in the beam path of the optical module, so as to shorten the optical path length. It is also possible to vary the optical path length by a displacement of the mirror along the optical path. This solution has the advantage that the necessary mirrors and servomotors are relatively cheap components. Depending on the structure of the optical module, it is even possible to use a mirror which is already present in the system, so that the costs can be further reduced.

According to another solution, the controllable mirror has an adjustable reflectance or an adjustable transmittance. Changing the reflectance from a value close to 0 to a high value or changing the transmittance from a high value to a value close to 0 acts like introducing a mirror into the optical path. The solution has the advantage that no mechanical elements are used, i. that no components have to be moved. The switching between the optical paths can therefore be accomplished faster. Mirrors with adjustable reflectance or transmittance can be realized, for example, as a solid-state thin-film element using liquid crystals. Typically, switching times in the range between 10ms and 100ms are achieved.

According to one aspect of the invention, the optical module has at least one switchable polarization modulator and at least one polarization-dependent mirror for switching between the optical paths. This solution also works without mechanical elements, so that a fast switching can be realized. Switchable polarization modulators can also be achieved with the aid of liquid crystals realize, however, significantly shorter switching times ≤ 1ms are possible.

According to one aspect of the invention, the switching between the optical paths is synchronized with the imaging unit. By a combination of a fast switching (preferably with a frequency> 100 Hz) between the optical paths and a synchronous switching of the image contents by means of a rapidly switchable imaging unit, such as an LCD TFT display (LCD: Liquid Crystal Display, liquid crystal display, TFT display : Thin-film transistor display, display with thin-film transistor drive), a temporally sequential, but perceived by the viewer but simultaneously perceived display content at different virtual distance can be achieved with only one imaging unit.

Preferably, a head-up display device according to the invention, a method according to the invention or a device according to the invention are used in an autonomously or manually controlled vehicle, in particular a motor vehicle.

Further features of the present invention will become apparent from the following description and the appended claims, taken in conjunction with the figures.

1 schematically shows the general structure of a head-up display device for a motor vehicle;

2 schematically shows a method for controlling a display of a head-up display device for a motor vehicle;

3 shows a first embodiment of a device for controlling a display of a head-up display device for a motor vehicle;

4 shows a second embodiment of a device for controlling a display of a head-up display device for a motor vehicle;

5 schematically represents a motor vehicle in which a solution according to the invention is realized;

6 schematically shows a first embodiment of a head-up display device, which uses a movable mirror and in which a first optical path is set;

7 shows the head-up display device 6 in which a second optical path is set;

8th schematically shows a second embodiment of a head-up display device, which uses a mirror with adjustable reflectance and in which a first optical path is set;

9 shows the head-up display device 8th in which a second optical path is set;

10 schematically shows a third embodiment of a head-up display device, which uses a switchable polarization modulator and in which a first optical path is set;

11 shows the head-up display device 10 in which a second optical path is set;

12 schematically shows a fourth embodiment of a head-up display device, which uses two switchable polarization modulators and in which a first optical path is set;

13 shows the head-up display device 12 in which a second optical path is set; and

14 shows the head-up display device 12 where a third optical path is set.

For a better understanding of the principles of the present invention, embodiments of the invention will be explained in more detail below with reference to the figures. It is understood that the invention is not limited to these embodiments, and that the features described can also be combined or modified without departing from the scope of the invention as defined in the appended claims.

1 schematically shows a head-up display device 2 for a motor vehicle 1 , with their help content on a projection screen 5 of the motor vehicle 1 can be displayed, for example, on the windshield or on an additional disc of glass or plastic, which is arranged between the driver and the windscreen on the dashboard. The contents presented are by an imaging unit 3 generated and with the help of an optical module 4 on the projection screen 5 projected. Typically, the projection takes place in an area of the windshield above the steering wheel. The imaging unit 3 For example, it can be an LCD TFT display. The head-up display device 2 is usually in a dashboard of the motor vehicle 1 installed.

2 shows schematically a method for controlling a display of a head-up display Device for a motor vehicle. In a first step, a desired image plane is determined for an image generated by an imaging unit of the head-up display device 20 , An optical path of the head-up display device is then set in accordance with the desired image plane for a projection of the image generated by the imaging unit onto a projection surface 21 , The setting 21 of the optical path is preferably carried out by driving a controllable mirror or a switchable polarization modulator. The setting 21 may be synchronized with the generation of the image by the imaging unit.

3 shows a simplified schematic representation of a first embodiment of a device 30 for controlling a display of a head-up display device for a motor vehicle. The device 30 has an entrance 31 for receiving data allowing a determination of a desired image plane for the display contents. From the received data determines a data processing unit 32 the desired image plane for the image generated by an imaging unit of the head-up display device. A control unit 33 then sets an optical path of the head-up display device corresponding to the desired image plane for projection of the image generated by the imaging unit onto a projection surface. The adjustment of the optical path can be effected, for example, by driving a controllable mirror or a switchable polarization modulator. It may also be synchronized with the generation of the image by the imaging unit. The from the control unit 33 generated commands are via an output 35 the device 30 provided. The data processing unit 32 and the control unit 33 can be from a control unit 34 to be controlled. Via a user interface 37 If necessary, settings of the data processing unit 32 , the control unit 33 or the control unit 34 be changed. The in the device 30 accumulating data can also be stored in memory 36 the device 30 be stored, for example, for a later evaluation. The data processing unit 32 , the control unit 33 as well as the control unit 34 can be implemented as dedicated hardware, such as integrated circuits. Of course, they can also be partially or fully combined or implemented as software running on a suitable processor. The entrance 31 and the exit 35 may be implemented as separate interfaces or as a combined bidirectional interface.

4 shows a simplified schematic representation of a second embodiment of a device 40 for controlling a display of a head-up display device for a motor vehicle. The device 40 has a processor 42 and a memory 41 on. For example, the device is 40 to a computer or a controller. In the storage room 41 are filed instructions that the device 40 when executed by the processor 42 to perform the steps according to one of the described methods. The in the store 41 filed instructions thus embody one by the processor 42 executable program that realizes the inventive method. The device has an entrance 43 for receiving information. From the processor 42 generated data will be via an output 44 provided. In addition, they can be stored in memory 41 be filed. The entrance 43 and the exit 44 can be combined to a bidirectional interface.

The processor 42 may include one or more processing units, such as microprocessors, digital signal processors, or combinations thereof.

The stores 36 . 41 The embodiments described may have both volatile and non-volatile memory areas and include a wide variety of memory devices and storage media, for example hard disks, optical storage media or semiconductor memories.

5 schematically represents a motor vehicle 1 in which a solution according to the invention is realized. The motor vehicle has a head-up display device 2 on, with the information on the windscreen of the motor vehicle 1 or on an additional disc (not shown) located between the driver and the windshield. The head-up display device 2 is from a device 30 for controlling the display of the head-up display device 2 driven. In addition, the motor vehicle 1 a navigation system 50 and an environment sensor 51 on, for example, a camera system. From navigation data of the navigation system 50 or environmental sensor data 51 Content is determined by the head-up display device 2 to be displayed. The device 30 controls the head-up display device 2 according to the image plane desired for the display. The transmission of data within the motor vehicle 1 is done with the help of a network 53 , to the other control units 52 can be connected.

Hereinafter, a preferred embodiment of the invention with reference to the 6 to 14 to be discribed. In this embodiment, the beam path is folded in the optical module. The switching between the different optical paths is effected by a change in the optical path length. The 6 to 14 illustrate different ways to effect this change in the optical path length.

6 and 7 schematically show a first embodiment of a head-up display device 2 holding a sliding mirror 8th uses.

In 6 is a first optical path 6 set. The contents presented are by an imaging unit 3 generated and with the help of a first mirror 11 and a second mirror 13 along the first optical path 6 on the projection screen 5 pictured, in this case, the windshield, where they are from the driver 14 be perceived as a virtual image. Typically, this is the first mirror 11 and at the second mirror 13 around aspherical mirrors. Outside the beam path is a sliding mirror 8th ,

In 7 became the sliding mirror 8th introduced into the beam path, whereby the optical path changes. The of the imaging unit 3 generated content is now using the sliding mirror 8th and the second mirror 13 along the second optical path 7 on the projection screen 5 displayed. They are from the driver 14 again perceived as a virtual image, but at a different distance. One from the sliding mirror 8th caused distortion of the displayed content can be easily compensated in that of the imaging unit 3 generated image is adjusted to the distortion. The sliding mirror 8th can also be configured as an aspheric mirror.

Instead of using an additional sliding mirror 8th may also be a change of the optical path by a displacement of the first mirror 11 or the imaging unit 3 be achieved. Likewise, several movable mirrors 8th be provided to realize further optical paths and thus additional distances of the virtual image.

8th and 9 schematically show a second embodiment of a head-up display device 2 holding a mirror 8th uses with adjustable reflectance or adjustable transmittance.

In 8th is a first optical path 6 set. The contents shown are as before by an imaging unit 3 generated and with the help of a first mirror 11 and a second mirror 13 along the first optical path 6 on the projection screen 5 pictured where they are from the driver 14 be perceived as a virtual image. Again, this is the first mirror 11 and at the second mirror 13 usually aspherical mirror. In 8th is the controllable mirror 8th adjusted so that it has a reflectance near 0 or a transmittance near 1.

In 9 became the reflectance of the mirror 8th is set to a value near 1, which changes the optical path. The of the imaging unit 3 generated content is now using the controllable mirror 8th and the second mirror 13 along the second optical path 7 on the projection screen 5 displayed. They are from the driver 14 again perceived as a virtual image, but at a different distance. One possibly from the controllable mirror 8th Distortion of the displayed content caused as before by an adaptation of the imaging unit 3 generated image are compensated. The controllable mirror 8th can also be configured as an aspheric mirror. Likewise, multiple mirrors 8th be provided with adjustable reflectance or transmittance to realize more optical paths and thus additional distances of the virtual image.

10 and 11 schematically show a third embodiment of a head-up display device 2 , which is a switchable polarization modulator 9 in combination with a polarization-dependent mirror 10 uses. In its passive state has the switchable polarization modulator 9 in this example, no influence on the polarization plane. In its active state, the switchable polarization modulator rotates 9 the polarization plane by + 90 °. The polarization-dependent mirror 10 is designed so that it allows light to pass unhindered with the polarization levels 0 ° and 180 °, while reflecting light with the polarization planes 90 ° and 270 °.

In 10 is a first optical path 6 set. The contents shown are again by an imaging unit 3 generated. That of the imaging unit 3 outgoing light is linearly polarized. The associated polarization plane is considered below as a 90 ° plane. In 10 is the switchable polarization modulator 9 active, after passing through the switchable polarization modulator 9 Thus, the light has a polarization plane of 180 ° and passes through the polarization-dependent mirror 10 , It is from a first mirror 11 reflected, the polarization plane remains unchanged, and then again passes the polarization-dependent mirror 10 and the switchable polarization modulator 9 , The switchable polarization modulator 9 In this case, the polarization plane rotates by a further + 90 °, so that the light has a polarization plane of 270 °. Finally, the light is using a second mirror 13 on the projection screen 5 pictured where it is from the driver 14 is perceived as a virtual image. As before, the first mirror is 11 and at the second mirror 13 typically aspheric mirrors.

In 11 is a second optical path 7 set. The switchable polarization modulator 9 is passive after passing through the switchable polarization modulator 9 Thus, the light has a polarization plane of 90 ° and becomes polarization-dependent mirror 10 reflected. The reflected light passes again the switchable polarization modulator 9 , where the polarization plane remains unchanged, and is determined by means of the second mirror 13 on the projection screen 5 displayed. It is from the driver 14 again perceived as a virtual image, but at a different distance. One possibly from the polarization-dependent mirror 10 Distortion of the displayed content caused as before by an adaptation of the imaging unit 3 generated image are compensated. The polarization-dependent mirror 10 can also be configured as an aspheric mirror.

12 to 14 schematically show a fourth embodiment of a head-up display device 2 , the two switchable polarization modulators 9 . 12 in combination with two polarization-dependent mirrors 10 . 15 uses. In their respective passive state have the first switchable polarization modulator 9 and the second switchable polarization modulator 12 in this example, no influence on the polarization plane. In their respective active state, the first switchable polarization modulator rotate 9 and the second switchable polarization modulator 12 the polarization plane in each case by + 90 °. The first polarization-dependent mirror 10 is designed so that it allows light to pass unhindered with the polarization levels 0 ° and 180 °, while reflecting light with the polarization planes 90 ° and 270 °. The second polarization-dependent mirror 15 is designed so that it allows light to pass freely with the polarization planes 90 ° and 270 °, whereas light with the polarization planes 0 ° and 180 ° is reflected.

In 12 is a first optical path 6 set. The contents shown are again by an imaging unit 3 generated. That of the imaging unit 3 outgoing light is linearly polarized. The associated polarization plane is considered below as a 90 ° plane. In 12 is the first switchable polarization modulator 9 active, after passing through the first switchable polarization modulator 9 Thus, the light has a polarization plane of 180 ° and passes through the first polarization-dependent mirror 10 , Also the second switchable polarization modulator 12 is active after passing through the second switchable polarization modulator 12 Thus, the light has a polarization plane of 270 ° and also passes the second polarization-dependent mirror 15 , It is from a first mirror 11 reflected, the polarization plane remains unchanged, and then again passes the second polarization-dependent mirror 15 and the second switchable polarization modulator 12 , The second switchable polarization modulator 12 In this case, the polarization plane rotates by a further + 90 °, so that the light has a polarization plane of 0 ° and the first polarization-dependent mirror 10 can happen. The first switchable polarization modulator 9 turns the plane of polarization by another + 90 ° so that the light has a plane of polarization of 90 ° and with the help of a second mirror 13 on the projection screen 5 is shown. There it gets from the driver 14 perceived as a virtual image. As before, the first mirror is 11 and at the second mirror 13 typically aspheric mirrors.

In 13 is a second optical path 7 set. The first switchable polarization modulator 9 is passive after passing through the first switchable polarization modulator 9 Thus, the light has a polarization plane of 90 ° and is the first polarization-dependent mirror 10 reflected. The reflected light again passes the first switchable polarization modulator 9 , where the polarization plane remains unchanged, and is determined by means of the second mirror 13 on the projection screen 5 displayed. It is from the driver 14 again perceived as a virtual image, but at a different distance.

In 14 is a third optical path 16 set. The first switchable polarization modulator 9 is active after passing through the first switchable polarization modulator 9 Thus, the light has a polarization plane of 180 ° and passes through the first polarization-dependent mirror 10 , The second switchable polarization modulator 12 is passive, after passing through the second switchable polarization modulator 12 Thus, the light has a polarization plane of 180 ° unchanged and is the second polarization-dependent mirror 15 reflected. The reflected light again passes the second switchable polarization modulator 12 , wherein the polarization plane remains unchanged, so that the light is the first polarization-dependent mirror 10 can happen. The first switchable polarization modulator 9 rotates the polarization plane by another + 90 ° so that the light has a plane of polarization of 270 ° and with the help of the second mirror 13 on the projection screen 5 is shown. It is from the driver 14 perceived as a virtual image, but again at a different distance.

One possibly from the first polarization-dependent mirror 10 or from the second polarization-dependent mirror 15 Distortion of the displayed content caused as before by an adaptation of the imaging unit 3 generated image are compensated. The first polarization-dependent mirror 10 and the second polarization-dependent mirror 15 can also be configured as aspherical mirror.

LIST OF REFERENCE NUMBERS

1

 motor vehicle

2

 Head-up display device

3

 Imaging unit

4

 Optical module

5

 projection

6

 First optical path

7

 Second optical path

8th

 Controllable mirror

9

 Switchable polarization modulator

10

First polarization-dependent mirror

11

First mirror

12

Switchable polarization modulator

13

Second mirror

14

driver

15

Second polarization-dependent mirror

16

Third optical path

20

Determine a desired image plane

21

Setting an optical path corresponding to the image plane

30

contraption

31

entrance

32

Data processing unit

33

control unit

34

control unit

35

output

36

Storage

37

User interface

40

contraption

41

Storage

42

processor

43

entrance

44

output

50

navigation system

51

ambient sensor

52

control unit

53

network

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• DE 102014211339 A1 [0003]
• US 2015/0268466 A1 [0005]
• DE 102008044334 A1 [0007]

Claims (14)

Head-up display device ( 2 ) for a motor vehicle ( 1 ), with an imaging unit ( 3 ) and an optical module ( 4 ) for projecting one of the imaging unit ( 3 ) on a projection surface ( 5 ), characterized in that the optical module ( 4 ) at least a first optical path ( 6 ) and a second optical path ( 7 ) for the projection of the imaging unit ( 3 ) on the projection surface ( 5 ), between which can be switched. Head-up display device ( 2 ) according to claim 1, wherein the optical module ( 4 ) a controllable mirror ( 8th ) for switching between the optical paths ( 6 . 7 ) having. Head-up display device ( 2 ) according to claim 2, wherein the controllable mirror ( 8th ) in a beam path in the optical module ( 4 ) can be introduced or displaced in the beam path. Head-up display device ( 2 ) according to claim 2, wherein the controllable mirror ( 8th ) has an adjustable reflectance or an adjustable transmittance. Head-up display device ( 2 ) according to claim 1, wherein the optical module ( 4 ) at least one switchable polarization modulator ( 9 ) and at least one polarization-dependent mirror ( 10 ) for switching between the optical paths ( 6 . 7 ) having. Head-up display device ( 2 ) according to one of the preceding claims, wherein the switching between the optical paths ( 6 . 7 ) synchronized with the imaging unit ( 3 ) he follows. Method for controlling a display of a head-up display device ( 2 ) for a motor vehicle ( 1 ), with the steps: - determining ( 20 ) of a desired image plane for one of an imaging unit ( 3 ) of the head-up display device ( 2 ) generated image; characterized by: - setting ( 21 ) of an optical path ( 6 . 7 ) of the head-up display device ( 2 ) corresponding to the desired image plane for a projection of the imaging unit ( 3 ) on a projection surface ( 5 ). Method according to claim 7, wherein said setting ( 21 ) of the optical path ( 6 . 7 ) by driving a controllable mirror ( 8th ) or a switchable polarization modulator ( 9 ) he follows. Method according to claim 7 or 8, wherein said setting ( 21 ) of the optical path ( 6 . 7 ) synchronously with the generation of the image by the imaging unit ( 3 ) he follows. Contraption ( 30 ) for controlling a display of a head-up display device ( 2 ) for a motor vehicle ( 1 ), the device ( 30 ): - a data processing unit ( 32 ) for determining ( 20 ) of a desired image plane for one of an imaging unit ( 3 ) of the head-up display device ( 2 ) generated image; characterized by: - a control unit ( 33 ) for setting ( 21 ) of an optical path ( 6 . 7 ) of the head-up display device ( 2 ) corresponding to the desired image plane for a projection of the imaging unit ( 3 ) on a projection surface ( 5 ). Contraption ( 30 ) according to claim 10, wherein the control unit ( 33 ) for setting ( 21 ) of the optical path ( 6 . 7 ) a controllable mirror ( 8th ) or a switchable polarization modulator ( 9 ). Contraption ( 30 ) according to claim 10 or 11, wherein the control unit ( 33 ), the optical path ( 6 . 7 ) synchronously with the generation of the image by the imaging unit ( 3 ) ( 21 ). A computer-readable storage medium having instructions, when executed by a computer, for executing the steps of a method according to any one of claims 7 to 9 for controlling a display of a head-up display device ( 2 ) for a motor vehicle ( 1 ). Motor vehicle ( 1 ), characterized in that it comprises a head-up display device ( 2 ) according to one of claims 1 to 6 or a device ( 30 ) according to one of claims 10 to 12, a method according to one of claims 7 to 9 for controlling a display of a head-up display device ( 2 ).

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