DE102021106972B4 - Head-up display for a motor vehicle and motor vehicle with this - Google Patents

Abstract

Head-up display (5) for a motor vehicle (1), with a projection device (6), which is arranged recessed in a dashboard (2) of the motor vehicle (1) when the head-up display (5) is installed, with a shaft (11), which connects to the dashboard (2) when the head-up display (5) is installed and which has a shaft front wall (12) and a shaft rear wall (13), the shaft rear wall (13) being on the shaft front wall (12) facing the inside (18) has a reflection-reducing wall section (19) with an uneven surface contour (22), characterized in that the shaft rear wall (13) is segmented on its inside (18) in the wall section (19) and several wall segments (22 ), which follow one another in a height direction (23) of the shaft (11), wherein adjacent wall segments (22) are inclined to one another in a wall cross section of the shaft rear wall (13) that runs parallel to the height direction (23), so that the wall segments (22) are inclined in the wall cross section each have an inclination angle (26, 27) relative to the height direction (23), so that the inclination angles (26, 27) of the successive wall segments (22) are selected so that there are larger inclination angles (26) and smaller inclination angles in the height direction (23). (27) alternate.

Description

The present invention relates to a head-up display for a motor vehicle with the features of the preamble of claim 1. The invention also relates to a motor vehicle equipped with such a head-up display.

Such a head-up display can also be referred to as a windshield display device and is used to visually display information as a display image in the field of vision of a driver (male, female, diverse) of a motor vehicle. The projection of the visual information, i.e. the display image, onto a display area of the windshield or windshield is usually carried out in such a way that the driver has the impression that the virtual image is outside the passenger compartment in front of the vehicle. Ambient light, i.e. light from an external light source, can be problematic for such head-up displays if this light incident from outside, in particular from the projection device itself, is reflected or mirrored onto the display area of the windshield, which is used to display the Display image is provided. Depending on the strength of these reflections, there is a more or less strong overlay with the display image, which accordingly impairs its visibility for the driver.

A conventional head-up display, for example, is from the DE 10 2017 206 364 A1 known and comprises a projection device which is arranged recessed in a dashboard of the motor vehicle when the head-up display is installed, as well as a shaft which connects to the dashboard when the head-up display is installed and which has a shaft front wall and a shaft rear wall. In the known head-up display, the shaft is closed at its open end remote from the projection device with the aid of a transparent cover plate which is equipped with an optical grid to reduce reflection.

A generic head-up display is, for example, from the US 2017/0 315 351 A1 known and is characterized by the fact that the rear wall of the shaft has, on its inside facing the front wall of the shaft, a reflection-reducing wall section with an uneven surface contour, which is created by roughening.

Another head-up display in which the reflection-reducing wall section is formed by an uneven surface structure with a large number of pointed spikes can be used DE 10 2016 113 945 A1 remove.

A head-up display in which the reflection-reducing wall section is formed by an absorbent surface can be used DE 10 2016 109 879 A1 remove.

From the DE 10 2017 211 507 A1 Another head-up display is known in which the open side of the shaft is also closed with a cover plate which is provided with a reflection-reducing surface structure.

From the DE 10 2017 219 069 A1 Another head-up display is known in which the cover plate for closing the shaft is equipped with a slatted structure in order to reduce reflections.

From the US 2020/0 371 351 A1 A head-up display is known in which a reflection reduction device is arranged in the shaft, which deflects stray light from the respective external light source so that it hits the windshield outside the display area. For this purpose, the reflection reduction device is arranged in the shaft between the projection device and the shaft opening, so that stray light incident into the shaft necessarily hits the reflection reduction device. The reflection reduction device used here works with a prism that has a reflective surface with an absorption effect.

For example, a conventional head-up display without reflection-reducing measures is out of the question DE 10 2016 226 181 A1 known.

The present invention deals with the problem of providing an improved or at least a different embodiment for a head-up display, which can be implemented comparatively inexpensively and reduces disruptive reflections.

This problem is solved according to the invention by the subject matter of the independent claims. Advantageous embodiments are the subject of the dependent claims.

The invention is based on the general idea of equipping the rear wall of the shaft on its inside facing the front wall of the shaft with a reflection-reducing wall section, which has an uneven surface contour for this purpose. When the head-up display is installed, the rear wall of the shaft is arranged behind the front wall of the shaft and accordingly limits the shaft to the rear. In the present context, the relative locations “front” and “rear” refer to the vehicle, so that the front faces the front of the vehicle, while the rear faces the rear of the vehicle is. For the shaft, this means that when the head-up display is installed, the rear wall of the shaft is located closer to the rear of the vehicle than the front wall of the shaft.

The invention uses the knowledge here that stray light from an external light source, which enters the shaft from the environment through the windshield, can be reflected on components of the projection device, such as a projector, projection optics and a mirror, in such a way that the reflected stray light hits the rear wall of the shaft and, in the case of a conventional design, from there hits the windshield within the display area. As a result, the display image is affected by an indirect reflection via the rear wall of the shaft. The suggestion according to the invention of equipping the rear wall of the shaft on its inside with a reflection-reducing wall section makes it possible to reduce such impairments caused by such indirect reflections. The uneven surface contour of the wall section ensures that the stray light hitting the wall section of the shaft rear wall is not reflected or only reflected to a limited extent onto the display area.

It is noteworthy that such an uneven surface contour in the wall section of the shaft rear wall can be achieved comparatively easily as part of the production of the shaft rear wall or shaft.

For example, the uneven surface contour can be formed integrally on the rear wall of the shaft. The reflection-reducing measure presented here can therefore be implemented inexpensively. In particular, an expensive, reflection-reducing cover for the free shaft opening can be dispensed with.

According to a first solution according to the invention, the shaft rear wall is segmented on its inside in the wall section, so that it has a plurality of wall segments which follow one another in a height direction of the shaft, with adjacent wall segments being inclined to one another in a wall cross section of the shaft rear wall that runs parallel to the height direction. With the help of the successive and mutually inclined wall segments, the uneven surface contour of the wall section is achieved. The inclination of the wall segments relative to each other and to the height direction are chosen so that stray light, which is reflected from the projection device onto the wall section of the rear shaft wall, is deflected or reflected by the wall segments in such a way that it hits the windshield outside the display area.

In a first alternative to the first solution, the wall segments in the wall cross section each have an angle of inclination relative to the height direction, the inclination angles of the successive wall segments being selected such that larger angles of inclination and smaller angles of inclination alternate in the height direction. This means that a wall segment with a larger angle of inclination follows a wall segment with a smaller angle of inclination, which in turn follows a wall segment with a larger angle of inclination. It has been shown that such an arrangement with alternating large and small inclination angles promotes efficient deflection of the reflected stray light to areas outside the display area.

A second alternative to the first solution proposes that the wall segments form a first wall segment group, which has first wall segments that run parallel to one another in the wall cross section and each have a first angle of inclination to the height direction. Furthermore, the wall segments form a second wall segment group, which has second wall segments that run parallel to one another in the wall cross section and each have a second inclination angle to the height direction that is different from the first inclination angle. This design also ensures that larger and smaller angles of inclination alternate in the wall segments that follow one another in the height direction, the larger angles of inclination being the same and, for example, forming the first angle of inclination, while the smaller angles of inclination are the same and, for example, forming the second angle of inclination. This simplifies the production of the segmented wall section.

According to another advantageous embodiment, it can be provided that the wall segments are designed as flat wall segments in the wall cross section. With the help of the flat wall segments, a targeted reflection is achieved. In principle, however, it is also conceivable to design the wall segments to be curved in the wall cross section.

In a third alternative to the first solution, the wall segments run in a straight line along the back wall of the shaft. This can be advantageous for targeted reflection on the wall segments.

According to a further development, the rectilinear wall segments can run in a fan shape within the wall section. For example, this fan can fan out from left to right or fan out from right to left. This allows the segmented wall section to be formed for example, adapt to a curved contour of the dashboard, while at the same time an efficient reflection can be achieved to deflect stray light.

According to a second solution according to the invention, the wall section is designed in a step-shaped or wave-shaped manner in a wall cross section of the shaft rear wall that runs parallel to the height direction of the shaft. Above all, the staircase-shaped design efficiently deflects stray light outside the display area.

According to an expedient embodiment, the projection device can have a projector that generates a display image and a mirror that, when the head-up display is installed, projects the display image through the shaft opening onto a display area of a windshield of the vehicle. An embodiment is now advantageous in which, when the head-up display is installed, light rays that come from an external light source arranged outside the windshield penetrate the windshield, penetrate into the shaft, hit the mirror and are reflected from the mirror to the wall section, be deflected by the wall section in such a way that these light rays hit the windshield outside the display area or not at all. This is achieved by the uneven surface contour of the wall section. Disturbances in the display image caused by stray light reflections can be significantly reduced.

A motor vehicle according to the invention, which is preferably a passenger car, has a dashboard and is equipped with a head-up display of the type described above.

Further important features and advantages of the invention emerge from the subclaims, from the drawings and from the associated description of the figures based on the drawings.

It is understood that the features mentioned above and those to be explained below can be used not only in the combination specified in each case, but also in other combinations or alone, without departing from the scope of the invention. The above-mentioned and below-mentioned components of a higher-level unit, such as a device, a device or an arrangement, which are designated separately, can form separate parts or components of this unit or can be integral areas or sections of this unit, even if this shown differently in the drawings.

Preferred exemplary embodiments of the invention are shown in the drawings and are explained in more detail in the following description, with the same reference numbers referring to the same or similar or functionally the same components.

• 1 einen Längsschnitt eines Kraftfahrzeugs im Bereich eines Head-Up-Displays,
• 2 eine Schrägansicht von vorn auf das Fahrzeug im Bereich des Head-Up-Displays,
• 3 ein vergrößertes Detail aus 2,
• 4 eine Schnittansicht entsprechend Schnittlinien IV in 3,
• 5 eine vereinfachte Prinzipdarstellung der Schnittansicht aus 4.

It shows, schematically,

• 1 a longitudinal section of a motor vehicle in the area of a head-up display,
• 2 an oblique view of the vehicle from the front in the area of the head-up display,
• 3 an enlarged detail 2 ,
• 4 a sectional view according to section lines IV in 3 ,
• 5 a simplified schematic representation of the sectional view 4 .

Accordingly 1 comprises a motor vehicle 1, which is preferably a passenger car, a dashboard 2, which runs in a vehicle interior 3 below a windshield 4, and a head-up display 5, which is built into the dashboard 2. The head-up display 5 has a projection device 6, which is arranged recessed in the dashboard 2 in the installation state of the head-up display 5 shown. The projection device 6 can have a projector 7 for generating a display image and a mirror 8 which projects the display image 8 generated by the projector 7 onto a display area 9 of the windshield 4. The display image shows certain information for the driver in the display area 9 1 is symbolized by an eye 10. The head-up display 5 also has a shaft 11, which connects to the dashboard 2 in the installed state shown. In particular, the shaft 11 connects the dashboard 2 with the projection device 6. The shaft 11 has a shaft front wall 12 and a shaft rear wall 13. When installed, the shaft rear wall 13 is arranged behind the shaft front wall 12 with respect to the longitudinal orientation of the vehicle 1. The projection device 6 is located at a lower end of the shaft 11 facing away from the windshield 4. An upper end of the shaft 11 facing the windshield 4 defines a shaft opening, which is open here. In principle, this upper end of the shaft can be closed with a cover that is transparent to the light or display image generated by the projection device 6.

In 1 A disturbance situation is shown in which an external light source 14, i.e. a light source 14 arranged outside the windshield 4 in the environment 15 of the vehicle 1, such as the sun, emits light rays 16 which pass through the windshield 4 into the shaft 11 to the mirror 8 arrive, then reflected on the mirror 8 and deflected onto the rear wall 13. With a broken line is in 1 now a stray light 17 is indicated, which in a conventional head-up display 5 reflects the light coming from the mirror 8 onto the windshield 4 and there into the display area 9, so that the display image is impaired.

To avoid such disruption of the display image, the shaft rear wall 13 is according to 2 until 5 on its inside 18 facing the shaft front wall 12 is equipped with a reflection-reducing wall section 19 which has an uneven surface contour 20. This surface contour 20 effects the above with reference to 1 described incident of stray light, that the stray light 17 is no longer deflected into the display area 9, but is deflected in such a way that the stray light 17 hits the windshield 4 outside the display area 9 or no longer hits the windshield 4 at all. This results in a significant reduction in disturbing reflections.

2 shows a view from the front through the windshield 4 onto an area of the dashboard 2 having the head-up display 5. Also visible is a steering wheel connection 21 located in the vehicle interior for connecting a steering wheel, not shown here.

According to the 2 until 5 In order to realize the uneven surface contour 20, the shaft rear wall 13 can be segmented on its inside 18 in the wall section 19, so that the wall section 19 has a plurality of wall segments 22. The wall section 19 is segmented in such a way that the wall segments 22 follow one another in a height direction 23 of the shaft 11, with adjacent wall segments 22 being inclined to one another in a wall cross section of the shaft rear wall 13 that runs parallel to the height direction 23. The 4 and 5 each show such a wall cross section, i.e. said wall cross section lies in the image plane of 4 and 5 or extends parallel to it. The inclination of adjacent wall segments 22 relative to one another is best seen in the enlarged view of the cross section 5 recognizable. Purely as an example is in 5 a larger segment angle 24 is entered, which occurs between two adjacent wall segments 22 and is greater than 180 °. In addition, a smaller segment angle 25 is entered adjacent to it, which is present between two adjacent wall segments 22 and which is smaller than 180°. When the head-up display 5 is installed, the height direction 23 extends parallel to the vertical axis of the vehicle 1.

Furthermore, it can expediently be provided that the wall segments 22 each have an angle of inclination 26 or 27 in the wall cross section relative to the height direction 23. These inclination angles 26, 27 are chosen so that in the height direction 23, larger inclination angles 26 and smaller inclination angles 27 alternate in successive wall segments 22. In other words, in the height direction 23, larger and smaller angles of inclination 26, 27 alternately follow one another. The larger angles of inclination 26 do not have to be the same size. Likewise, the smaller angles of inclination 27 do not have to be the same size.

However, an embodiment is preferred in which the larger angles of inclination 26 are all the same size, for example the larger angles of inclination 26 can each be approximately 45°. It can also be provided that the smaller angles of inclination 27 are approximately the same size. For example, the smaller angles of inclination can each be approximately 30°. An embodiment is preferred in which the wall segments 22 form a first wall segment group, which has first wall segments 22 ₁ which run parallel to one another in the wall cross section and which each have a first inclination angle 27, which here corresponds to the smaller inclination angle 27, with respect to the height direction 23. Furthermore, the wall segments 22 form a second wall segment group, which has second wall segments 22 ₂ which run parallel to one another in the wall cross section and which each have a second inclination angle 26 which is different from the first inclination angle 27 and which here corresponds to the larger inclination angle 26. Accordingly, the first wall segments 22 ₁ in the wall cross section are each inclined by the first inclination angle 27, for example by approximately 30°, relative to the height direction 23, while the second wall segments 22 ₂ are each inclined by the second inclination angle 26 relative to the height direction 23, i.e. in the example by about 45°.

In the preferred example shown here, the wall segments 22 are each designed as flat wall segments 22 in the wall cross section, so that they are flat or straight on the inside 18 of the shaft rear wall 13. According to the 2 until 3 An embodiment is preferred in which the wall segments 22 run in a straight line along the rear wall of the shaft 13. The wall segments 22 thus form flat surfaces on the inside 18.

According to the 2 and 3 It can now additionally be provided that the straight wall segments 22 run in a fan shape within the wall section 19. In the views of the 2 and 3 the wall segments 22 fan out from left to right. In other words, the wall segments 22 are arranged in the wall section 19 at an angle to one another, such that they converge outside the shaft 11.

How in particular 4 and 5 can be seen, the wall section 19 can be designed essentially in a staircase shape in the wall cross section in order to realize the uneven surface contour 20. This staircase-shaped configuration of the wall section 19 can be achieved in particular by the segmentation of the wall section 19 described above.

Claims (8)

Head-up display (5) for a motor vehicle (1), with a projection device (6), which is arranged recessed in a dashboard (2) of the motor vehicle (1) when the head-up display (5) is installed a shaft (11), which connects to the dashboard (2) when the head-up display (5) is installed and which has a shaft front wall (12) and a shaft rear wall (13), the shaft rear wall (13) being on the shaft front wall (12) facing the inside (18) has a reflection-reducing wall section (19) with an uneven surface contour (22), characterized in that the shaft rear wall (13) is segmented on its inside (18) in the wall section (19) and several wall segments (22 ) which follow one another in a height direction (23) of the shaft (11), wherein adjacent wall segments (22) are inclined to one another in a wall cross section of the shaft rear wall (13) that runs parallel to the height direction (23), so that the wall segments (22) in the wall cross section each have an inclination angle (26, 27) relative to the height direction (23), so that the inclination angles (26, 27) of the successive wall segments (22) are selected so that there are larger inclination angles (26) and smaller inclination angles in the height direction (23). (27) alternate. Head-up display (5) according to the generic term of Claim 1 , characterized in that the shaft rear wall (13) is segmented on its inside (18) in the wall section (19) and has a plurality of wall segments (22) which follow one another in a height direction (23) of the shaft (11), with adjacent wall segments (22 ) are inclined to one another in a wall cross section of the shaft rear wall (13) that runs parallel to the height direction (23), so that the wall segments (22) form a first wall segment group, which has first wall segments (22 ₁ ) that run parallel to one another in the wall cross section, each of which has a first angle of inclination (27) to the height direction (23) have that the wall segments (22) form a second wall segment group, which has second wall segments (22 ₂ ) which run parallel to one another in the wall cross section and each have a second inclination angle (26) that is different from the first inclination angle (27). exhibit. Head-up display (5) according to the generic term of Claim 1 , characterized in that the shaft rear wall (13) is segmented on its inside (18) in the wall section (19) and has a plurality of wall segments (22) which follow one another in a height direction (23) of the shaft (11), with adjacent wall segments (22 ) are inclined to one another in a wall cross section of the shaft rear wall (13) that runs parallel to the height direction (23), so that the wall segments (22) run in a straight line along the shaft rear wall (13). Head-up display (5). Claim 3 , characterized in that the rectilinear wall segments (22) run in a fan shape within the wall section (19). Head-up display (5) according to one of the Claims 1 until 4 , characterized in that the wall segments (22) are designed as flat wall segments (22) in the wall cross section on the inside (18). Head-up display (5) according to the generic term of Claim 1 , characterized in that the wall section (19) is designed in a step-shaped or wave-shaped manner in a wall cross section of the shaft rear wall (13) that runs parallel to the height direction (23) of the shaft (11). Head-up display (5) according to one of the Claims 1 until 6 , characterized in that the projection device (6) has a projector (7), which generates a display image, and a mirror (8), which, when the head-up display (5) is installed, projects the display image onto a display -Area (9) of a windshield (4) of the vehicle (1) projects that when the head-up display (5) is installed, light rays (16) come from an external light source (14) arranged outside the windshield (4). , penetrate the windshield (4), enter the shaft (11), hit the mirror (8) and from the mirror (8) are reflected to the wall section (19), are deflected by the wall section (19) in such a way that these light rays (16) do not hit the windshield (4) or outside the display area (19). Motor vehicle (1), in particular passenger car, with a dashboard (2) and with a head-up display (5) according to one of the preceding claims.

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