JP2018120135A - Head-up display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to adjust an angle of a virtual image display surface without causing a viewer to feel troublesomeness.SOLUTION: A first image display part 10 has a first display surface 12 that displays a first image 14; a projection part 30 projects the first image 14 toward a projection member to cause a viewer to view a first virtual image 311 that is a virtual image of the first image 14; an angle varying part 40 rotates at least either one of the first display surface 12 or the projection part 30 to change an angle 331 of the first virtual image 311 with respect to a road surface; and a control part 50 reduces visibility of the first virtual image 311 in adjusting the angle 331 through the angle varying part 40.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a head-up display that displays a virtual image.

  The head-up display superimposes the superimposed image on the scenery (real scene) in front of the host vehicle, thereby adding information to the real scene or emphasizing a specific target in the real scene (AR: Augmented Reality). ) And providing the desired information accurately while minimizing the line of sight movement of the viewer driving the vehicle, contributing to safe and comfortable vehicle operation.

  For example, Patent Document 1 discloses that a virtual image forming surface (virtual image display surface) is not directly facing the viewer and is arranged in a state inclined with respect to the left-right direction of the viewer as a perspective. A feeling is added. Thereby, the virtual image matched with the perspective of the road surface on which the host vehicle travels can be displayed.

  The virtual image display surface is arranged so as to be substantially parallel to the road surface, for example, like the second virtual image display surface disclosed in Patent Document 2, so that the perspective of the virtual image is changed to the perspective of the road surface. Can be matched.

  In general, the posture of the vehicle (for example, the pitch angle of the vehicle) changes depending on the weight of the passengers on board and the weight of the loaded luggage. Even if the virtual image display surface is arranged parallel to the road surface, there is a possibility that the virtual image display surface may not be appropriately arranged as expected with respect to the road surface according to a change in the posture of the vehicle. The head-up display can rotate the image plane of the virtual image in real space, so that the virtual image display surface is maintained in an appropriate position with respect to the road surface (real scene) even when the vehicle posture changes. can do.

JP, 2006-53686, A JP 2016-212338 A

However, when the virtual image display surface is rotated while displaying the virtual image, the virtual image displayed on the virtual image display surface may be distorted, and the viewer may feel annoyed.
One object of the present invention is to provide a head-up display capable of adjusting the angle of the virtual image display surface without causing the viewer to feel bothersome.

The present invention employs the following means in order to solve the above problems.
The head-up display according to the present invention reduces the visibility of the first virtual image when adjusting the angle of the first virtual image display surface capable of displaying the first virtual image in the region. It is possible to prevent the viewer from seeing the first virtual image while the angle of the surface is being adjusted, and to adjust the angle of the virtual image display surface without making the viewer feel bothersome. The gist.

The head-up display in the present invention is
A first virtual image 311 can be displayed on a virtual first virtual image display surface 310 that is mounted on a vehicle and projects a first image 14 on a projection member and is inclined with respect to a road surface on which the vehicle travels. A head-up display
A first image display unit 10 having a first display surface 12 for displaying the first image;
A projection unit 30 that projects the first image onto the projection member;
An angle variable unit 40 that rotates at least one of the first display surface and the projection unit and changes an angle 331 of the first virtual image display surface with respect to the road surface;
Angle adjustment amount setting processes S4 and S13 for setting the angle adjustment amount T, virtual image angle adjustment processes S6 and S16 for adjusting the angle through the angle variable unit based on the set adjustment amount, and the angle adjustment And a control unit 50 that performs display adjustment processing S5 and S15 that reduce the visibility of the first virtual image when the processing is performed. With such a configuration, when the angle 331 of the first virtual image display surface 310 on which the first virtual image 311 is displayed is adjusted, the visibility of the first virtual image 311 is reduced, and thus the first virtual image display surface 310 is displayed. The first virtual image 311 that is easily distorted and visually recognized when the angle 331 is adjusted can be made difficult to be recognized by the viewer.

The head-up display according to the second aspect of the present invention further includes attitude information acquisition means 53a for acquiring vehicle attitude information G related to the attitude of the vehicle.
The control unit may set the adjustment amount based on the vehicle attitude information acquired by the attitude information acquisition unit. With such a configuration, the adjustment amount T of the angle 331 of the first virtual image display surface 310 can be controlled according to the posture of the vehicle. For example, the road surface 5 is not affected by the change in the posture of the vehicle. It is also possible to keep the angle 331 of the first virtual image display surface 310 to be constant.

The head-up display according to the third aspect of the present invention further includes operation information acquisition means 53b for acquiring vehicle operation information H related to the operation state of the vehicle.
The control unit determines whether the vehicle is stopped based on the vehicle operation information acquired by the operation information acquisition unit, and the vehicle attitude acquired from the attitude information acquisition unit when the vehicle is stopped The adjustment amount may be set based on the information. If the vehicle attitude (vehicle balance) is detected while the vehicle is running, the vehicle is detected in consideration of various factors such as the speed of the vehicle, the shape of the road surface on which the vehicle is running, and the steering angle of the vehicle. Although it is necessary, with the head-up display of the present invention, it is possible to easily detect the posture of the vehicle (the balance of the vehicle) while reducing the factors that must be taken into consideration.

The head-up display according to the fourth aspect of the present invention further includes operation information acquisition means 53b for acquiring vehicle operation information H relating to the operation state of the vehicle,
The control unit determines whether the vehicle is stopped based on the vehicle operation information acquired by the operation information acquisition unit, and the vehicle attitude acquired from the attitude information acquisition unit while the vehicle is stopped The adjustment amount may be set continuously or intermittently based on information, and when the vehicle starts, the virtual image angle adjustment processing may be performed based on the adjustment amount set immediately before. With such a configuration, it is possible to reduce a complicated display in which the visibility of the display is lowered every time the vehicle posture changes.

The head-up display according to the fifth aspect of the present invention further includes a second image display unit 20 having a second display surface 22 for displaying the second image 24, and the projection member includes the second image display unit 20. A head-up display capable of displaying a second virtual image 321 on a virtual second virtual image display surface 320 by projecting an image,
When the display adjustment process is performed, the control unit may display a transmission image 24 for transmitting to the viewer that the virtual image angle adjustment process is being performed on the second display surface. With such a configuration, the viewer can recognize that the virtual image angle adjustment process is being executed.

In the head-up display according to the sixth aspect of the present invention, the transmission image includes a road surface image 24a indicating the road surface and a virtual image display surface image 24b indicating the first virtual image display surface.
The control unit may change and display an angle 25 formed by the road surface image and the virtual image display surface image according to the angle of the first virtual image display surface adjusted by the virtual image angle adjustment process. Good. With such a configuration, the viewer can clearly recognize the progress of the virtual image angle adjustment process.

  The embodiments described below are used to easily understand the present invention, and those skilled in the art should note that the present invention is not unduly limited by the embodiments described below.

(First embodiment)
With reference to FIG. 1, the virtual first virtual image display surface 310 and the second virtual image display surface 320 generated by the head-up display (hereinafter referred to as HUD) 100 of the present invention will be described. In order to facilitate the following description, as shown in FIG. 1, in the real space, for example, the left-right direction facing the front of the vehicle 1 is defined as the X axis (the right direction is the X axis positive direction), and the vertical The direction is defined as the Y-axis (the upper side in the vertical direction is the positive Y-axis direction), and the front-rear direction is defined as the Z-axis (the rear direction is the positive Z-axis direction).

  As shown in FIG. 1, the HUD 100 is housed in a dashboard 3 of a vehicle (one application example of a moving body) 1, for example. For example, the HUD 100 projects display light 200 (first display light 210 and second display light 220) indicating vehicle information and the like onto a part of a front windshield (an example of a projection target member) 2 of the vehicle 1. The front windshield 2 generates a predetermined eye box (not shown) by reflecting the first display light 210 and the second display light 220 toward the viewer side. The viewer places the first viewpoint (position of the viewer's eyes) 4 in the eye box, so that the first virtual image display surface 310, which is virtually generated by the HUD 100, in front of the first windshield 2. The first virtual image 311 and the second virtual image 321 can be viewed on the second virtual image display surface 320.

  The first virtual image display surface 310 shown in FIG. 1 is visually recognized from the center of the first virtual image display surface 310, for example, when the line connecting the center of the first virtual image display surface 310 and the viewpoint 4 is the visual axis 4a. The angle 310a formed by the person-side display area and the visual axis 4a is an acute angle, and the first is visually recognized by being superimposed over a predetermined range of the road surface 5 (positions 5a to 5b in FIG. 1). A virtual image 311 is displayed. Specifically, for example, the first virtual image display surface 310 is parallel to the road surface 5 in FIG. 1 (the horizontal direction formed by the XZ plane), and is 20 m away from the eyebox in the forward direction (the traveling direction of the vehicle 1). It is provided so that it may be visually recognized over the position 5b which is 50 m away from the position 5a. The first virtual image display surface 310 may be provided with an inclination of about ± 20 degrees from an angle parallel to the road surface 5 in FIG. The first virtual image display surface 310 is adjusted to an appropriate arrangement with respect to the road surface 5 when the HUD 100 is manufactured, when the HUD 100 is assembled to the vehicle 1, or by adjustment by a viewer's switch (not shown) or the like. . The head-up display of the present invention adjusts the first virtual image display surface 310 to an appropriate arrangement with respect to the road surface 5 even when the posture of the vehicle 1 changes. Specific processing will be described later.

  The second virtual image display surface 320 shown in FIG. 1 is, for example, the center of the second virtual image display surface 320 when the line connecting the center of the second virtual image display surface 320 and the viewpoint 4 is the line of sight axis 4b. Is provided so that an angle 320a formed between the display area on the lower side in the vertical direction and the visual axis 4b is larger than an angle 310a formed between the first virtual image display surface 310 and the visual axis 4a. indicate. Specifically, for example, the second virtual image display surface 320 is substantially parallel to a direction (XY plane) perpendicular to the traveling direction of the vehicle 1 in FIG. 1 and forward from the eyebox (the traveling direction of the vehicle 1). ) Of 5 m to 10 m away. The second virtual image display surface 320 may be provided with an inclination of about ± 10 degrees from an angle parallel to a direction (XY plane) perpendicular to the traveling direction of the vehicle 1 in FIG. Further, the HUD 100 does not necessarily need to generate the second virtual image display surface 320. Therefore, a configuration for generating the second virtual image display surface 320 to be described later may be omitted.

  FIG. 2 is a diagram illustrating an example of a landscape, a first virtual image 311, and a second virtual image 321 that can be seen by a viewer sitting in the driver's seat of the vehicle 1 including the HUD 100 illustrated in FIG. 1. The first virtual image display surface 310 adds information to the road surface 5 by, for example, visualizing the first virtual image 311 such as an arrow indicating the route of the vehicle 1 over the real scene (road surface 5). The second virtual image display surface 320 displays a second virtual image 321 that is not directly related to a real scene such as the vehicle speed of the vehicle 1 on the display surface.

  A vehicle attitude detection unit 6 that detects the attitude of the vehicle 1 is mounted on the vehicle 1 of FIG. The vehicle attitude detection unit 6 analyzes, for example, a triaxial acceleration sensor (not shown) and the triaxial acceleration detected by the triaxial acceleration sensor, so that the pitch angle (vehicle attitude) of the vehicle 1 with respect to the horizontal plane is used. And vehicle attitude information G including information related to the pitch angle of the vehicle 1 is output to the HUD 100 (control unit 50). The vehicle posture detection unit 6 may be configured by a height sensor (not shown) disposed in the vicinity of the suspension of the vehicle 1 in addition to the above-described triaxial acceleration sensor. At this time, the vehicle posture detection unit 6 estimates the pitch angle of the vehicle 1 as described above by analyzing the height of the vehicle 1 from the ground detected by the height sensor, and information on the pitch angle of the vehicle 1. Is output to the HUD 100 (control unit 50). Further, the vehicle posture detection unit 6 may include an imaging camera (not shown) that images the outside of the vehicle 1 and an image analysis unit (not shown) that analyzes the captured image. At this time, the vehicle posture detection unit 6 estimates the pitch angle (vehicle posture) of the vehicle 1 from the time change of the landscape included in the captured image. Note that the method by which the vehicle attitude detection unit 6 determines the pitch angle of the vehicle 1 is not limited to the method described above, and the pitch angle of the vehicle 1 may be determined using a known sensor or analysis method.

  Moreover, the vehicle 1 of FIG. 1 is equipped with a vehicle information detection unit 7 that detects information related to the operation state of the vehicle 1. The vehicle information detection unit 7 is, for example, an ECU (Electronic Control Unit) or a sensor that is mounted on the vehicle 1, and the vehicle operation information H that can determine whether the vehicle 1 is stopped is sent to the HUD 100 (control unit 50). Output.

FIG. 3 is a diagram showing an example of the configuration of the HUD 100 shown in FIG.
The HUD 100 in FIG. 1 includes, for example, a first image display unit 10, a second image generation unit 20, a reflection unit 31, a display synthesis unit 32, a concave mirror 33, an actuator 40, and a control unit 50. The HUD 100 is generally housed in the dashboard of the vehicle 1, but the first image display unit 10, the second image generation unit 20, the reflection unit 31, the display composition unit 32, the concave mirror 33, and the actuator 40. All or part of the control unit 50 may be arranged outside the dashboard. The HUD 100 (control unit 50) is connected to a bus 8 including an in-vehicle LAN (Local Area Network) mounted on the vehicle 1, and part or all of vehicle information can be input from the bus 8.

  The first image display unit 10 in FIG. 3 receives, for example, a first projection unit 11 including a projector using a reflective display device such as DMD or LCoS, and projection light from the first projection unit 11. The first image 14 is displayed, and the first screen 12 that emits the first display light 210 indicating the first image 14 toward the reflecting portion 31 is mainly configured. The first image display unit 10 displays the first image 14 on the first screen (first display surface) 12 based on image data D input from the control unit 50 to be described later. The first virtual image 311 is displayed on the first virtual image display surface 310 virtually generated forward.

  FIG. 4 is a diagram illustrating an example in which the first image 14 is displayed on the first screen (first display surface) 12 illustrated in FIG. 3. In order to facilitate understanding of the following description, as shown in FIG. 4, the left-right direction of the first screen 12 is defined as the dx axis (the left direction is the dx-axis positive direction), and the first screen 12 is The direction is defined as the dy axis (the downward direction is the positive direction of the dy axis). The position in the X-axis direction of the first virtual image 311 that the viewer shown in FIG. 2 visually recognizes from the driver's seat of the vehicle 1 is that of the first image 14 displayed on the first screen 12 shown in FIG. This corresponds to the position in the dx axis direction. Similarly, the position in the Y-axis direction of the first virtual image 311 that the viewer shown in FIG. 2 visually recognizes from the driver's seat of the vehicle 1 is displayed on the first screen 12 shown in FIG. This corresponds to the position of the image 14 in the dy-axis direction. It should be noted that the real space described above is determined by the arrangement of the optical members (first image display unit 10, second image generation unit 20, reflection unit 31, display synthesis unit 32, concave mirror 33, actuator 40) in the HUD 100, and the like. The relationship between the above XY coordinate axes and the dxdy coordinate axes used in the description of the first screen 12 is not limited to the above.

  As shown in FIG. 4, the first screen 12 in FIG. 3 has a region 13 in which the first image 14 can be displayed. Of the first screen 12, an area 13 where the first image 14 can be displayed is referred to as a first use area 13, for example. The first virtual image display surface 310 corresponds to the first use area 13 of the first image display unit 10, and the first virtual image display surface 310 in the size and the real space of the first virtual image display surface 310. Can be adjusted according to the size of the first use area 13 on the first screen 12 and the position of the first use area 13 on the first screen 12. Note that the surface of the first screen 12 has a predetermined line with respect to the visual axis 4c, for example, when the line connecting the center of the first use area 13 of the first screen 12 and the viewpoint 4 is the visual axis 4c. Arranged at an angle.

  The second image generation unit 20 in FIG. 3 is similar to the first image display unit 10 described above, for example, a second projection unit 21 including a projector using a reflective display device such as DMD or LCoS, and the like. The projection light from the second projection unit 21 is received to display the second image 24, and the second display light 220 indicating the second image 24 is emitted toward the display composition unit 32 described later. The second screen 22 is mainly composed. The first image display unit 10 displays the second image 24 on the second screen (second display surface) 22 based on the image data D input from the control unit 50 to be described later. A second virtual image 321 is displayed on the virtual image display surface 320. The second screen 22 has an area 23 in which the second image 24 can be displayed. Of the second screen 22, an area 23 in which the second image 24 can be displayed is referred to as a second use area 23, for example. The second virtual image display surface 320 corresponds to the second use area 23 of the second image generation unit 20, and the second virtual image display surface 320 in the size and the real space of the second virtual image display surface 320. Can be adjusted according to the size of the second use area 23 on the second screen 22 and the position of the second use area 23 on the second screen 22. The surface of the second screen 22 is a predetermined line with respect to the visual axis 4d, for example, when the line connecting the center of the second use area 23 of the second screen 22 and the viewpoint 4 is the visual axis 4d. Arranged at an angle.

  The reflection unit 31 (projection unit 30) in FIG. 3 is formed by, for example, a flat plate mirror, and is inclined on the optical path of the first display light 210 from the first image display unit 10 toward the viewpoint 4, The first display light 210 emitted from the first image display unit 10 is reflected toward the display composition unit 32. The reflection unit 31 includes an actuator 40 that rotates the reflection unit 31. In addition, the reflection part 31 may have a curved surface instead of a plane.

  The actuator 40 is, for example, a stepping motor, a DC motor, or the like, and rotates the reflecting unit 31 based on vehicle attitude information G detected by a vehicle attitude detection unit 6 described later under the control of the control unit 50 described later. Then, the angle and position of the first virtual image display surface 310 are adjusted.

  The display combining unit 32 (projection unit 30) in FIG. 3 is configured by, for example, a flat half mirror in which a transflective layer such as a metal reflective film or a dielectric multilayer film is formed on one surface of a translucent substrate. Is done. The display combining unit 32 reflects the first display light 210 from the first image display unit 10 reflected by the reflection unit 31 toward the concave mirror 33, and the second display unit 210 receives the second display light from the second image generation unit 20. The display light 220 is transmitted to the concave mirror 33 side. The transmittance of the display combining unit 32 is, for example, 50%, but the luminance of the first virtual image 311 and the second virtual image 321 may be adjusted by appropriately adjusting.

  The concave mirror 33 (projection unit 30) in FIG. 3 is, for example, the light of the first display light 210 and the second display light 220 from the first image display unit 10 and the second image generation unit 20 toward the viewpoint 4. The first display light 210 and the second display light 220 that are arranged on the road and are emitted from the first image display unit 10 and the second image generation unit 20 are reflected toward the front windshield 2. . The optical path length of the first display light 210 from the first screen (first display surface) 12 of the first image display unit 10 to the concave mirror 33 described above is the second path of the second image generation unit 20. The first virtual image generated by the first image display unit 10 is arranged so as to be longer than the optical path length of the second display light 220 from the screen (second display surface) 22 to the concave mirror 33. 311 is imaged at a position farther from the eye box than the second virtual image 321 generated by the second image generation unit 20. The concave mirror 33 typically cooperates with the front windshield 2 for the first display light 210 and the second display light 220 generated by the first image display unit 10 and the second image generation unit 20. A function of working and enlarging, a function of correcting the distortion of the first virtual image 311 and the second virtual image 321 generated by the curved surface of the front windshield 2 and visually recognizing the virtual image without distortion, the first virtual image 311 and the second virtual image It has a function of forming the virtual image 321 at a position away from the viewer by a predetermined distance.

  FIG. 5 shows a schematic configuration example of the control unit 50 of FIG. As illustrated in FIG. 5, the control unit 50 includes, for example, a processing unit 51, a storage unit 52, and an interface 53. The processing unit 51 is configured by, for example, a CPU and a RAM, the storage unit 52 is configured by, for example, a ROM, and the interface 53 is configured by an input / output communication interface connected to the bus 8. For example, the interface 53 can acquire vehicle attitude information G, vehicle operation information H, and the like, which will be described later, via the bus 8, and the storage unit 52 generates image data D based on the input vehicle information and the like. And data for generating drive data T based on the input vehicle attitude information G can be stored, and the processing unit 51 reads the data from the storage unit 52 and executes a predetermined operation. Thus, the image data D and the drive data T can be generated. The interface 53 includes, for example, vehicle attitude information G including information related to the attitude of the vehicle 1 from the vehicle attitude detection unit 6 via the bus 8 and vehicle operation information including information related to the operation state of the vehicle 1 from the vehicle information detection unit 7. H can be acquired, and also has functions as posture information acquisition means 53a and motion information acquisition means 53b described in the claims of the present invention. Control unit 50 may be inside HUD 100, and a part or all of the functions may be provided on the vehicle 1 side outside HUD 100.

  FIG. 6 is a flowchart showing an example of the operation of the HUD 100 of the present embodiment. The HUD 100 is, for example, when the vehicle 1 is activated, when electric power is supplied to the electronic device of the vehicle 1, or when a predetermined time has elapsed since the activation of the vehicle 1 or the electric power supply of the electronic device of the vehicle 1. The processing described below is started.

  In step S1, the control unit 50 acquires vehicle operation information H including information related to the vehicle operation of the vehicle 1 from the vehicle information detection unit 7 via the interface 53. If the vehicle 1 is stopped, the control unit 50 proceeds to step S2. continue processing.

  In step S2, the control unit 50 obtains vehicle posture information G including information related to the current vehicle posture of the vehicle 1 from the vehicle posture detection unit 6 via the interface 53, and proceeds to step S3.

  In step S3, the control unit 50 compares the current vehicle posture information G acquired in step S2 with the original vehicle posture stored in the storage unit 52, and determines whether there is a change in the vehicle posture. When it is determined that the vehicle posture has not changed (No in step S3), the control unit 50 returns to step S1. On the other hand, if it is determined that the vehicle posture has changed (Yes in step S3), the control unit 50 proceeds to step S4.

  In step S4, the control unit 50 determines drive data T including the drive amount of the actuator 40 based on the current vehicle attitude information G acquired in step S2, and proceeds to step S5. Specifically, the control unit 50 reads table data stored in advance in the storage unit 52, and determines drive data T corresponding to the current vehicle attitude information G acquired in step S2. In step S4, the control unit 50 may obtain the drive data T from the vehicle attitude information G by calculation using a preset calculation formula.

  In step S <b> 5, the control unit 50 reduces the visibility of the first image 14 of the first image display unit 10 to a level at which the viewer can hardly see. The process of reducing the visibility includes, for example, reducing the brightness of the first image 14, reducing the brightness of the first image 14, or changing the hue of the first image 14 to a color with low attractiveness, including. In step S5, the control unit 50 may turn off the display of the first image display unit 10.

  In step S6, the control unit 50 drives the actuator 40 based on the drive data T determined in step S4, changes the angle and position of the first virtual image display surface 310 with respect to the real scene, and then proceeds to step S7. In step S6, specifically, for example, the control unit 50 controls the actuator 40 so that the first virtual image display surface 310 is parallel to the road surface 5 even when the vehicle posture of the vehicle 1 is changed. The angle and position of the first virtual image display surface 310 with respect to the real scene are changed by rotating the reflecting unit 31 positioned on the optical path of the first display light 210 emitted from one image display unit 10.

  In step S <b> 7, the control unit 50 increases the visibility of the first image 14 of the first image display unit 10 and displays a first virtual image 311 that is a virtual image of the first image 14 to the viewer. If the vehicle 1 is stopped, the control unit 50 repeats steps S2 to S7. That is, the control unit 50 reduces display visibility while the vehicle 1 is stopped (step S5), and changes the angle and position of the first virtual image display surface 310 (step S6), and then displays the display. The resuming operation (step S7) is repeated every time the posture of the vehicle 1 changes.

  By executing the processing described above, the relative angle between the first virtual image display surface 310 and the real scene (the road surface 5) can be maintained even when the posture of the vehicle 1 changes. In order to reduce the visibility of the first virtual image 311 (first image 14) when the angle of the virtual image display surface 310 (first image display unit 10) is adjusted, the angle of the first virtual image display surface 310 is reduced. It is possible to prevent the display at the time of adjustment from being visually recognized.

  Note that the reduction in the visibility of the first image 14 executed by the control unit 50 in step S5 of FIG. 6 may be performed while the actuator 40 is driven in step S6. Specifically, the control unit 50 may gradually reduce the visibility of the first image 14 according to the passage of time or the angle of the actuator 40. Similarly, the visibility increase of the first image 14 executed by the control unit 50 in step S7 of FIG. 6 may be performed while the actuator 40 is driven in step S6. Specifically, the control unit 50 may gradually increase the visibility of the first image 14 according to the passage of time or the angle of the actuator 40.

  7A, 7B, and 7C are diagrams illustrating how the angle 330 formed by the first virtual image display surface 310 and the second virtual image display surface 320 generated by the HUD 100 according to the present embodiment is changed. FIG. 7A, FIG. 7B, and FIG. 7C are views showing the pitch angle (vehicle posture) indicating how much the pitch angle of the vehicle 1 is inclined with respect to the road surface 5 made of the XZ plane. ) Is a diagram showing how the reflecting unit 31 is rotated based on the vehicle attitude shown in FIG. (A), and (c) is the first graph based on the vehicle attitude shown in (a). It is a figure which shows the angle 330 which the virtual image display surface 310 and the 2nd virtual image display surface 320 make.

  FIG. 7A is a diagram illustrating an angle 330 formed by the first virtual image display surface 310 and the second virtual image display surface 320 when the vehicle 1 is in a vehicle posture 1 r parallel to the road surface 5. As shown in (a) of FIG. 7A, when the vehicle 1 is in the vehicle posture 1r parallel to the road surface 5, the reflecting unit 31 may, for example, drive data T determined in step S4 shown in FIG. The angle 30r shown in (b) of FIG. 7A based on the above is adjusted, and the first virtual image display surface 310 is adjusted to be substantially parallel to the road surface 5 as shown in (c) of FIG. 7A, for example. The angle 330 formed by the first virtual image display surface 310 and the second virtual image display surface 320 is an angle 330r of approximately 90 degrees. Hereinafter, the vehicle posture 1r in which the vehicle 1 shown in (a) of FIG. 7A is parallel to the road surface 5 is also referred to as a reference vehicle posture 1r. Further, the angle 30r of the reflecting portion 31 shown in FIG. 7A (b) is also referred to as a reference angle 30r. In addition, an angle 330r formed by the first virtual image display surface 310 and the second virtual image display surface 320 as shown in (c) of FIG. 7A is hereinafter also referred to as a reference angle 330r.

  FIG. 7B is a diagram illustrating an angle 330 formed by the first virtual image display surface 310 and the second virtual image display surface 320 when the front of the vehicle 1 is tilted upward in the vertical direction. As shown in FIG. 7B (a), when the vehicle posture 1u is such that the front of the vehicle 1 is tilted upward in the vertical direction with respect to the reference vehicle posture 1r, the reflecting portion 31 is, for example, step S4 shown in FIG. Based on the drive data T determined in step (b) in FIG. 7B, the angle 30u is rotated clockwise (CW direction) with respect to the reference angle 30r, and the first virtual image display surface 310 is For example, as shown in FIG. 7B (c), the angle 330 formed by the first virtual image display surface 310 and the second virtual image display surface 320 is adjusted to be substantially parallel to the road surface 5. The angle 330u is larger than the reference angle 330r.

  FIG. 7C is a diagram illustrating an angle 330 formed by the first virtual image display surface 310 and the second virtual image display surface 320 when the front of the vehicle 1 is tilted downward in the vertical direction. As shown in FIG. 7C (a), when the vehicle posture 1d is such that the front of the vehicle 1 is tilted downward in the vertical direction with respect to the reference vehicle posture 1r, the reflecting unit 31 is, for example, the step shown in FIG. Based on the drive data T determined in S4, as shown in FIG. 7C (b), the angle 30d is rotated counterclockwise (CCW direction) with respect to the reference angle 30r, and the first virtual image display surface 310 is adjusted so as to be substantially parallel to the road surface 5 as shown in FIG. 7C (c), for example, and an angle 330 formed by the first virtual image display surface 310 and the second virtual image display surface 320 is The angle 330d is smaller than the reference angle 330r.

Here, referring to FIG. 7A (c), FIG. 7B (c), and FIG. 7C (c), the angle 330 formed by the first virtual image display surface 310 and the second virtual image display surface 320 is the vehicle of the vehicle 1. It changes according to the posture. As in the example shown in FIGS. 7A, 7B, and 7C, for example, the angle formed by the first virtual image display surface 310 and the second virtual image display surface 320 as the front of the vehicle 1 moves upward in the vertical direction. 330 becomes larger. On the other hand, for example, as the front of the vehicle 1 goes downward in the vertical direction, the angle 330 formed by the first virtual image display surface 310 and the second virtual image display surface 320 increases.
[Modification]

In addition, this invention is not limited by the above embodiment and drawing. Changes (including deletion of constituent elements) can be added to the embodiments and the drawings as appropriate without departing from the scope of the present invention. Below, an example of a modification is described.
(Second embodiment)

  In the first embodiment, the actuator 40 is driven each time the posture of the vehicle 1 changes. However, the HUD 100 according to the second embodiment of the present invention may reduce the driving frequency of the actuator 40. . Below, the example of operation | movement of HUD100 of 2nd embodiment of this invention is demonstrated using FIG.

  In step S11, the control unit 50 acquires vehicle posture information G including information on the current vehicle posture of the vehicle 1 from the vehicle posture detection unit 6 via the interface 53, and proceeds to step S12.

  In step S12, the control unit 50 compares the current vehicle posture information G acquired in step S11 with the original vehicle posture stored in the storage unit 52, and determines whether there is a change in the vehicle posture. When it is determined that the vehicle posture has not changed (No in step S12), the control unit 50 returns to step S11. On the other hand, when it determines with the control part 50 having a change in a vehicle attitude | position (it is Yes at step S12), it transfers to step S13.

  In step S13, the control unit 50 determines drive data T including the drive amount of the actuator 40 based on the current vehicle attitude information G acquired in step S11, and proceeds to step S14. Specifically, the control unit 50 reads table data stored in advance in the storage unit 52, and determines drive data T corresponding to the current vehicle attitude information G acquired in step S11. In step S13, the control unit 50 may obtain the drive data T from the vehicle attitude information G by calculation using a preset calculation formula.

  In step S14, the control unit 50 acquires the vehicle operation information H including information related to the vehicle operation of the vehicle 1 from the vehicle information detection unit 7 via the interface 53, and if the start of the vehicle 1 is not detected (in step S14). No), returning to step S11, if the start of the vehicle 1 is detected (Yes in step S14), the process proceeds to step S15. The control unit 50 can estimate the start of the vehicle 1 from, for example, the speed of the vehicle 1, the shift position of the vehicle 1, the accelerator of the vehicle 1, the operation of the brake, or the open / closed state of the door of the vehicle 1. .

  In step S <b> 15, the control unit 50 reduces the visibility of the first image 14 of the first image display unit 10 to a level at which the viewer can hardly visually recognize the first image 14. The process of reducing the visibility includes, for example, reducing the brightness of the first image 14, reducing the brightness of the first image 14, or changing the hue of the first image 14 to a color with low attractiveness, including. In step S15, the control unit 50 may turn off the display of the first image display unit 10.

  In step S16, the control unit 50 drives the actuator 40 based on the drive data T determined in step S13, changes the angle and position of the first virtual image display surface 310 with respect to the real scene, and then proceeds to step S17. In step S16, specifically, for example, the control unit 50 controls the actuator 40 so that the first virtual image display surface 310 is parallel to the road surface 5 even when the vehicle posture of the vehicle 1 changes, The angle and position of the first virtual image display surface 310 with respect to the real scene are changed by rotating the reflecting unit 31 positioned on the optical path of the first display light 210 emitted from one image display unit 10.

  In step S <b> 17, the control unit 50 increases the visibility of the first image 14 of the first image display unit 10 and displays a first virtual image 311 that is a virtual image of the first image 14 to the viewer. When the vehicle 1 is stopped, the control unit 50 repeats steps S11 to S13, and when the vehicle 1 starts, executes steps S15 to S17. That is, the control unit 50 continuously or intermittently updates the drive data T of the actuator 40 according to the latest vehicle attitude information G while the vehicle 1 is stopped, and displays when the vehicle 1 starts. (Step S15), the angle of the first virtual image display surface 310 is changed (step S16), and then the display is resumed (step S17).

  The above is an example of operation | movement of HUD100 of 2nd embodiment of this invention. When the vehicle 1 starts, the first virtual image display surface 310 is adjusted to an angle according to the latest vehicle posture information G. Therefore, each time the vehicle posture is changed, as in the first embodiment, the first virtual image display surface 310 is adjusted. By adjusting the virtual image display surface 310, it is possible to reduce the annoyance felt by the viewer. In addition, since the driving data T of the actuator 40 is sequentially determined based on the latest vehicle posture information G while the vehicle 1 is stopped before the vehicle 1 starts, the posture of the vehicle 1 can be accurately detected. Can do.

  In the second embodiment, after detecting the start of the vehicle 1 in step S14, the control unit 50 uses the drive data T based on the latest vehicle attitude information G input in step S11 while the vehicle 1 is traveling. However, the actuator 40 may not be driven while the vehicle 1 is traveling. That is, after detecting the start of the vehicle 1 in step S14, the control unit 50 stores the drive data T determined based on the latest vehicle attitude information G input in the immediately preceding step S11, and uses a red signal or the like to store the vehicle data. When 1 stops again, the visibility of the first image 14 may be reduced in step S15, and the actuator 40 may be driven with the latest drive data T stored in step S16. With such a configuration, it is possible to prevent the visibility of the first virtual image 311 (first image 14) from being lowered while the vehicle 1 is traveling.

  In the above embodiment, the actuator 40 rotates the reflecting unit 31 positioned on the optical path of the first display light 210 up to the display combining unit 32 that directs the first display light 210 and the second display light 220 in the same direction. As a result, the angle 330 formed by the first virtual image display surface 310 and the second virtual image display surface 320 is changed, but the display combining unit 32 may be rotated by the actuator 40. In this case as well, the angle of the first virtual image display surface 310 with respect to the actual scene can be adjusted without adjusting the angle of the second virtual image display surface 320, as in the case of rotating the reflection unit 31 described above. it can.

  Further, the HUD 100 of the present invention rotates the display surface (first screen 12) of the first image display unit 10 with the actuator 40, so that the first virtual image display surface 310, the second virtual image display surface 320, The angle 330 formed by may be changed.

  In addition, the actuator 40 does not need to use the center of the display surface (first screen 12) of the reflection unit 31, the display synthesis unit 32, and the first image display unit 10 as the rotation axis AX. The position (including the end) may be used as the rotation axis AX. Further, the rotation axis AX may be provided at a position separated from each optical member.

  FIG. 9 shows an example of a situation where the real scene and the first virtual image 311 and the second virtual image 321 displayed by the modified example of the HUD 100 shown in FIG. 2 are visually recognized when facing the front of the vehicle 1 from the driver's seat. FIG. As shown in FIG. 9, the HUD 100 of the present invention includes a first virtual image display surface 310 generated by the first image display unit 10 and a second virtual image display surface 320 generated by the second image generation unit 20. And may be visually recognized separately. Specifically, for example, the HUD 100 in this modified example includes an area on the display combining unit 32 where the first display light 210 is incident from the first image display unit 10 and a second display from the second image display unit 20. You may comprise by separating | separating the area | region on the display synthetic | combination part 32 in which the light 220 injects.

  FIG. 10 is a diagram illustrating an example of a transmission image displayed on the second image display unit 20 in order to transmit to the viewer that the virtual image angle adjustment processing is being performed.

  When the display adjustment process is performed, the control unit 50 displays on the second display surface 22 a transmission image 24 that transmits to the viewer that the virtual image angle adjustment process is being executed, as shown in FIG. May be. With such a configuration, the viewer can recognize that the virtual image angle adjustment process is being executed.

  The transmission image 24 includes a road surface image 24a indicating the road surface and a virtual image display surface image 24b indicating the first virtual image display surface 310, and the control unit 50 adjusts the first in the virtual image angle adjustment processing. Depending on the angle of the virtual image display surface 310, the angle 25 formed by the road surface image 24a and the virtual image display surface image 24b may be changed and displayed. With such a configuration, the viewer can clearly recognize the progress of the virtual image angle adjustment process.

  In the above embodiment, the first image display unit 10 that generates the first virtual image display surface 310 and the second image generation unit 20 that generates the second virtual image display surface 320 are provided. The image display unit may be a single unit. The HUD 100 in this modified example projects projection light from a single projection unit (not shown) onto a plurality of screens (display surfaces) (not shown), and rotates one of the screens with an actuator, thereby The angle 330 formed by the virtual image display surface 310 and the second virtual image display surface 320 may be adjusted.

  In the above embodiment, the angle 330 formed by the first virtual image display surface 310 and the second virtual image display surface 320 is adjusted by adjusting the angle of the first virtual image display surface 310 with respect to the actual scene. The first virtual image display surface 310 and the second virtual image display surface 320 and the second virtual image display surface 320 are adjusted to have different angles with respect to the actual scenes, and the angle adjustment amounts are made different, whereby the first virtual image display surface 310 and the second virtual image display are displayed. The angle 330 formed with the surface 320 may be adjusted.

  Further, the first image display unit 10 may be a transmissive display panel such as a liquid crystal display element, a self-luminous display panel such as an organic EL element, or a scanning display device that scans laser light. Good.

It is a figure explaining the example of the 1st virtual image display surface and the 2nd virtual image display surface which the head up display of 1st embodiment of this invention produces | generates. It is a figure which shows the example of a mode that a real scene and the virtual image which the head-up display shown in FIG. 1 display are visually recognized when it faces the front of a vehicle from a driver's seat. It is a figure which shows the example of a structure of the head up display shown by FIG. It is a figure which shows the example by which the 1st image was displayed on the 1st screen shown by FIG. It is a figure which shows the example of a structure of the control part shown by FIG. It is a flowchart explaining operation | movement of the head-up display shown by FIG. FIG. 3 is a diagram for explaining an example of angles formed by the first and second virtual image display surfaces when the pitch angle of the vehicle is approximately parallel to the road surface by the head-up display shown in FIG. An example of a pitch angle is shown, (b) shows an example of an angle of a reflective part, and (c) is a figure showing arrangement of the 1st and 2nd virtual image display surfaces. FIG. 3 is a diagram for explaining an example of angles formed by the first and second virtual image display surfaces when the pitch angle of the vehicle is directed upward in the vertical direction by the head-up display shown in FIG. FIG. 4B is a diagram illustrating an example of the angle of the reflection portion, FIG. 5B is a diagram illustrating an example of the angle of the reflection portion, and FIG. FIG. 3 is a diagram for explaining an example of angles formed by the first and second virtual image display surfaces when the pitch angle of the vehicle is directed downward in the vertical direction by the head-up display shown in FIG. An example of the pitch angle of a vehicle is shown, (b) shows an example of an angle of a reflective part, and (c) is a figure showing arrangement of the 1st and 2nd virtual image display surfaces. It is a flowchart explaining operation | movement of the head-up display of 2nd embodiment of this invention. It is a figure which shows the example of a mode that the real scene and the virtual image which the modification of the head-up display shown in FIG. 2 display are visually recognized when it faces the front of a vehicle from a driver's seat. It is a figure which shows the example of the transmission image displayed on a 2nd image display part in order to transmit that a virtual image angle adjustment process is performed to a viewer.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle, 2 ... Front windshield (projection member), 3 ... Dashboard, 4 ... Viewpoint, 5 ... Road surface 5, 6 ... Vehicle attitude | position detection part, 7 ... Bus | bath, 10 ... 1st image display part, 20 2nd image generation part 31 ... Reflection part (projection part) 32 ... Display composition part (projection part) 33 ... Concave mirror (projection part) 40 ... Actuator 50 ... Control part 51 ... Processing part 52 ... Storage unit, 53 ... Interface (attitude information acquisition means, motion information acquisition means), 100 ... HUD (head-up display), 200 ... display light, 210 ... first display light, 220 ... second display light, DESCRIPTION OF SYMBOLS 310 ... 1st virtual image display surface, 311 ... 1st virtual image, 320 ... 2nd virtual image display surface, 321 ... 2nd virtual image, 330 ... Angle, AX ... Rotating axis, D ... Image data, G ... Vehicle attitude | position information

Claims (6)

The first virtual image is mounted on the virtual first virtual image display surface (310) inclined with respect to the road surface on which the vehicle travels by projecting the first image (14) on the projection member mounted on the vehicle. A head-up display capable of displaying (311),
A first image display section (10) having a first display surface (12) for displaying the first image;
A projection unit (30) for projecting the first image onto the projection member;
An angle variable unit (40) for rotating at least one of the first display surface and the projection unit and changing an angle (331) of the first virtual image display surface with respect to the road surface;
Angle adjustment amount setting processing (S4, S13) for setting the angle adjustment amount (T), and virtual image angle adjustment processing (S6, S16) for adjusting the angle through the angle variable unit based on the set adjustment amount. And a control unit (50) that performs display adjustment processing (S5, S15) that reduces the visibility of the first virtual image when the angle adjustment processing is performed.
Head-up display. Further comprising attitude information acquisition means (53a) for acquiring vehicle attitude information (G) relating to the attitude of the vehicle;
The control unit sets the adjustment amount based on the vehicle posture information acquired by the posture information acquisition unit.
The head-up display according to claim 1. Further comprising operation information acquisition means (53b) for acquiring vehicle operation information (H) relating to the operation state of the vehicle;
The control unit determines whether the vehicle is stopped based on the vehicle operation information acquired by the operation information acquisition unit, and the vehicle attitude acquired from the attitude information acquisition unit when the vehicle is stopped Based on the information, the adjustment amount is set.
The head-up display according to claim 2. Further comprising operation information acquisition means (53b) for acquiring vehicle operation information (H) relating to the operation state of the vehicle;
The control unit determines whether the vehicle is stopped based on the vehicle operation information acquired by the operation information acquisition unit, and the vehicle attitude acquired from the attitude information acquisition unit while the vehicle is stopped The adjustment amount is set continuously or intermittently based on information, and when the vehicle starts, the virtual image angle adjustment processing is performed based on the adjustment amount set immediately before.
The head-up display according to claim 2. A second image display unit (20) having a second display surface (22) for displaying the second image (24) is further provided, and the second image is projected onto the projection member, thereby virtually A head-up display capable of displaying the second virtual image (321) on the second virtual image display surface (320),
The control unit, when performing the display adjustment process, displays a transmission image (24) for transmitting to the viewer that the virtual image angle adjustment process is being performed on the second display surface.
The head-up display according to any one of claims 1 to 4. The transmission image includes a road surface image (24a) indicating the road surface, and a virtual image display surface image (24b) indicating the first virtual image display surface,
The controller changes and displays an angle (25) formed by the road surface image and the virtual image display surface image according to the angle of the first virtual image display surface adjusted by the virtual image angle adjustment processing. ,
The head-up display according to claim 5.

Images