Head-up display device and image rotation angle setting method

Abstract

To provide a head-up display device capable of more accurately adjusting the inclination of a projection image, and an image rotation angle setting method.SOLUTION: The head-up display device displays a virtual image by projecting onto a windshield, display light corresponding to a display image D emitted from a display surface 11a for displaying the display image D. The head-up display device comprises a correction display processing part which displays the display image D on the display surface 11a in a state where the display image D is rotated and inclined by display image rotation angle θd with the center position of the display image D as rotation center Cp so as to adjust the inclination of the virtual image in a left-right direction when viewed from a viewer. The display image rotation angle θd is set to be an angle larger than virtual image rotation angle which is inclination angle of the virtual image in a left-right direction generated when the display image D is displayed without inclination on the display surface 11a. The display image D and the virtual image have correspondence in which the virtual image rotates by the same angle as the virtual image rotation angle, by rotating the display image D by the display image rotation angle θd.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a head-up display device and an image rotation angle setting method. [Background technology]

[0002] For example, in the head-up display device described in Patent Document 1, when a stepping motor is operated, its rotation is transmitted to a movable support via a gear, causing a display mounted on the movable support to rotate clockwise and counterclockwise, thereby allowing the display light (display image) to be rotated left and right and making it possible to adjust the inclination of the display light (display image) relative to the irradiation member (see paragraph 0054 of Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5029876 Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration described in Patent Document 1, although the tilt of the displayed image can be adjusted, it is unclear to what extent the image displayed on the display device should be tilted in order to eliminate the tilt of the projected virtual image (projected image), making it difficult to accurately adjust the tilt of the projected image. In particular, the inventors of the present application have found that it is difficult to adjust the tilt of the projected image under the assumption that the rotation angle of the image displayed on the display device and the rotation angle of the projected image match.

[0005] The present disclosure has been made in consideration of the above-described circumstances, and aims to provide a head-up display device and an image rotation angle setting method that can more accurately adjust the tilt of a projected image. [Means for solving the problem]

[0006] In order to achieve the above object, a head-up display device according to a first aspect of the present disclosure includes: A head-up display device that displays a projection image by projecting display light corresponding to a display image emitted from a display surface that displays the display image onto a projection target, a correction display processing unit that displays the display image on the display surface in a tilted state by rotating it by a display image rotation angle around a position within the display image as a rotation center so as to adjust the tilt of the projected image in the left-right direction as seen by a viewer; the display image rotation angle is set to an angle larger than a projection image rotation angle, which is an angle of inclination in the left-right direction of the projection image that occurs when the display image is displayed on the display surface without being tilted, The display image and the projected image have a correspondence relationship such that by rotating the display image by the display image rotation angle, the projected image rotates by the same angle as the projected image rotation angle.

[0007] In order to achieve the above object, an image rotation angle setting method according to a second aspect of the present disclosure includes: 1. A method for setting an image rotation angle of a head-up display device that displays a projected image by projecting, onto a projection member, display light corresponding to a display image emitted from a display surface that displays the display image, the display light comprising: a first step of capturing the projected image with a camera; a second step in which a computer acquires a projection image rotation angle based on image data from the camera; a third step in which the computer acquires a display image rotation angle from the acquired projection image rotation angle and sets the display image rotation angle in the head-up display device; The head-up display device a correction display processing unit that displays the display image on the display surface in a tilted state by rotating the display image by the display image rotation angle acquired in the third step around a position within the display image as a rotation center so as to adjust the tilt of the projected image in the left-right direction as seen by a viewer; the display image rotation angle is set to an angle larger than a projection image rotation angle, which is an angle of inclination in the left-right direction of the projection image that occurs when the display image is displayed on the display surface without being tilted, The display image and the projected image have a correspondence relationship such that by rotating the display image by the display image rotation angle, the projected image rotates by the same angle as the projected image rotation angle. [Effects of the Invention]

[0008] According to the present disclosure, the tilt of the projected image can be adjusted more accurately. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic diagram of a vehicle equipped with a head-up display device according to an embodiment of the present disclosure. [Figure 2] FIG. 1 is a schematic plan view of a display surface according to an embodiment of the present disclosure. [Figure 3] FIG. 10 is a schematic front view of a virtual image whose tilt is not corrected. [Figure 4] FIG. 10 is a schematic front view of a virtual image after tilt correction according to an embodiment of the present disclosure. [Figure 5] 10 is a table showing the relationship between the display image rotation angle and the virtual image rotation angle for each model according to an embodiment of the present disclosure. [Figure 6] 10 is a graph showing the relationship between the display image rotation angle and the virtual image rotation angle in model A according to an embodiment of the present disclosure. [Figure 7] 10 is a graph showing the relationship between the display image rotation angle and the virtual image rotation angle in model B according to an embodiment of the present disclosure. [Figure 8] 10 is a graph showing the relationship between the display image rotation angle and the virtual image rotation angle in model C according to an embodiment of the present disclosure. [Figure 9] 10 is a flowchart illustrating a procedure for a correction display process according to an embodiment of the present disclosure. [Figure 10] 10 is a flowchart illustrating a procedure of a method for setting a target rotation angle according to an embodiment of the present disclosure. [Figure 11]FIG. 10 is a schematic diagram of a virtual image superimposed on a forward vehicle according to a modified example of the present disclosure. [Figure 12] FIG. 10 is a schematic diagram of a vehicle equipped with a head-up display device according to a modified example of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0010] A head-up display device and an image rotation angle setting method according to an embodiment of the present disclosure will be described with reference to the drawings. As shown in Fig. 1, the head-up display device 100 is installed in the dashboard of a vehicle 200. The head-up display device 100 emits display light L that displays an image toward a windshield 201, which is an example of a projection target member of the vehicle 200. The display light L is reflected by the windshield 201 and reaches a viewer 1 (mainly the driver of the vehicle 200). As a result, the head-up display device 100 displays a virtual image V so as to be superimposed on the real scenery seen through the windshield 201.

[0011] The head-up display device 100 includes a display device 10, a concave mirror 30, a control unit 25, a mirror driving mechanism 35, and a housing 60.

[0012] The housing 60 is made of a non-transparent resin material or metal material and houses the display device 10, the concave mirror 30, and the control unit 25. The housing 60 has an opening 60a formed in a position facing the windshield 201. The housing 60 has a plate-shaped window 60b made of a translucent resin material or glass material that closes the opening 60a.

[0013] The concave mirror 30 reflects the display light L from the display device 10 toward the windshield 201 while expanding the light. The mirror drive mechanism 35 is configured to rotate the concave mirror 30 about a rotation axis Ax extending along the vehicle width direction. By rotating the concave mirror 30 about the rotation axis Ax, the irradiation position of the display light L with respect to the viewer is adjusted in the height direction.

[0014] The display device 10 emits display light L under the control of the control unit 25. The display device 10 includes a display panel 11, an illumination device 12 that illuminates the display panel 11, and a panel rotation device 15. The lighting device 12 includes a plurality of light-emitting diodes (LEDs) as light sources and a group of light distribution lenses that distribute the light from the LEDs to the display panel 11, both of which are not shown.

[0015] The display panel 11 receives light from the illumination device 12 and emits display light L. The display panel 11 is a TFT (Thin Film Transistor) liquid crystal display panel. The display panel 11 has a display surface 11a on the side from which the display light L is emitted. A display image D (see FIG. 2) corresponding to the display light L is displayed on the display surface 11a. The display surface 11a is a rectangle that is long in the left-right direction (vehicle width direction) and short in the up-down direction. The display image D is smaller than the display surface 11a, is a rectangle that is long in the left-right direction (vehicle width direction) and short in the up-down direction, and is displayed rotated on the display surface 11a by a display image rotation angle θd around the center position of the display image D as the rotation center Cp. The display image D has a curved shape due to warping processing performed in accordance with the curvature of the windshield 201 or the concave mirror 30. The display image rotation angle θd will be described in detail later.

[0016] An angle Dv formed by the perpendicular direction of the display surface 11a with respect to the optical axis direction of the display light L emitted from the display surface 11a is set as an index indicating the orientation of the display surface 11a of the display panel 11. The angle Dv is positive when the display surface 11a faces downward, and negative when the display surface 11a faces upward. As shown by the dashed-dotted line in FIG. 1, as the angle Dv increases, the angle of the virtual image V with respect to the vertical axis Y increases, so that the virtual image V tilts in a direction along the road surface G as viewed by the viewer 1.

[0017] The panel rotation device 15 rotates the display panel 11 by changing the angle Dv around a rotation axis J extending along the vehicle width direction under the control of the control unit 25. The rotation axis J is located at the center of the height of the display surface 11a. The panel rotation device 15 has a drive unit such as a motor or a solenoid, neither of which are shown, and a transmission mechanism that transmits the drive force of this drive unit to the display panel 11 as a rotational force. Furthermore, as shown by the solid line display panel 11 in Figure 1, when the angle Dv is 15° to 35°, the virtual image V shown by the solid line in Figure 1 is displayed (upright display) as if it were standing on the horizontal road surface G as seen by the viewer 1. Furthermore, as shown by the dashed-dotted line on the display panel 11 in Figure 1, when the angle Dv is 40° to 50°, the virtual image V shown by the dashed-dotted line in Figure 1 is displayed tilted (tilted display) along the horizontal road surface G as seen by the viewer 1.

[0018] The control unit 25 controls the display panel 11 , the lighting device 12 , the mirror driving mechanism 35 and the panel rotating device 15 . The control unit 25 includes a central processing unit (CPU), a graphics display controller (GDC), a read-only memory (ROM), and a random access memory (RAM). The control unit 25 includes a target rotation angle acquisition unit 25a, a correction coefficient acquisition unit 25b, a display image rotation angle acquisition unit 25c, a correction display processing unit 25d, and a memory 25e. The memory 25e stores a data table showing the correspondence between the angle Dv and the correction coefficient a, the target rotation angle θi, etc.

[0019] The inventors of the present application have discovered that when the angle Dv is not zero, the virtual image rotation angle (target rotation angle) θi and the display image rotation angle θd do not match, and the display image rotation angle θd required to rotate the virtual image V by the target rotation angle θi changes depending on the magnitude of the angle Dv. The table in Figure 5, which illustrates this discovery, is a result of investigating the correspondence between each value of the virtual image rotation angle θi and each value of the display image rotation angle θd when the angle Dv is changed for three models A, B, and C. Here, the virtual image rotation angle θi becomes the target rotation angle θi required to rotate the virtual image V to eliminate tilt in the corrective display process described below. 6 to 8 show graphs in which the relationship between the display image rotation angle θd and the virtual image rotation angle θi is plotted for each model A, B, and C in the table of FIG. 5, and the plotted points are connected by straight lines using the least squares method, etc. From these graphs, it can be seen that as the angle Dv increases, the slope of the change in the virtual image rotation angle θi relative to the change in the display image rotation angle θd decreases. Specifically, as shown in the table in FIG. 5 , in model A, when the angle Dv is 20° and the display image rotation angle θd is changed from 0° to 1°, the virtual image rotation angle θi changes from 0° to approximately 0.9°. However, when the angle Dv is 45° and the display image rotation angle θd is changed from 0° to 1°, the virtual image rotation angle θi only changes from 0° to approximately 0.7°. Therefore, when it is necessary to rotate the virtual image V by a certain angle to correct the left-right tilt of the virtual image V, if the angle Dv is large, the display image rotation angle θd must be changed more greatly than if the angle Dv is small. Taking this into consideration, a different correction coefficient a is set for each angle Dv, and the display image rotation angle θd can be derived using the target rotation angle θi and the correction coefficient a using the following equation: θd=θi / a

[0020] In the table of Figure 5, for any of models A to C, the correction coefficient a is 0.9 (rounded to the second decimal place) for an upright display where the angle Dv is 20° (20° and 30° for model C), and the correction coefficient a is 0.7 (rounded to the second decimal place) for an inclined display where the angle Dv is 45°. Also, "Magnification [-]" indicates the magnification of the virtual image V relative to the display image D. The "virtual image tilt angle [deg]" is the angle of the virtual image V relative to the vertical axis Y, with the direction parallel to the vertical axis Y being zero degrees, and the direction in which the upper end of the virtual image V is further back from the viewer 1 than the lower end being positive, and the direction in which the upper end of the virtual image V is closer to the viewer 1 than the lower end being negative. Furthermore, the "display image rotation angle θd [deg]" is set from 0 to 4 in increments of 0.5, and the "virtual image rotation angle θi [deg]" for each θd is shown.

[0021] Next, the correction display process executed by the control unit 25 will be described with reference to the flowchart of FIG. First, the target rotation angle acquisition unit 25a acquires, from the memory 25e, the target rotation angle θi required to correct the tilt of the virtual image V (step S101). The target rotation angle θi is stored in advance in the memory 25e. A method for setting the target rotation angle θi will be described later with reference to FIG.

[0022] Next, coefficient acquisition unit 25b acquires correction coefficient a corresponding to angle Dv of display panel 11 while referring to the data table stored in memory 25e (step S102). When angle Dv is for upright display, coefficient acquisition unit 25b acquires correction coefficient a of 0.85 to 0.95, for example, 0.9. When angle Dv is for tilted display, coefficient acquisition unit 25b acquires correction coefficient a of 0.65 to 0.75, for example, 0.7. The patterns of the correction coefficient a may be set corresponding to two patterns of angle Dv, that is, upright display and inclined display, or may be set more finely for each predetermined angle Dv. As a specific example, the data table stored in the memory 25e stores the items "display tilt angle Dv [deg]" and "coefficient a" in association with each other in the table of FIG.

[0023] The display image rotation angle acquisition unit 25c acquires the display image rotation angle θd from the acquired target rotation angle θi and correction coefficient a using the above formula (step S103). For example, if the target rotation angle θi is 5° and the correction coefficient a is 0.9, the display image rotation angle θd is approximately 5.6°, and if the target rotation angle θi is 5° and the correction coefficient a is 0.7, the display image rotation angle θd is approximately 7.1°.

[0024] The correction display processing unit 25d displays the display image D rotated on the display surface 11a by the acquired display image rotation angle θd, with the center position of the display image D as the rotation center Cp (step S104), and terminates the correction display processing. As shown in FIG. 2, the display image rotation angle θd is the angle formed by the left-right direction (longitudinal direction) of the display image D with respect to the horizontal axis Xd on the display surface 11a, which corresponds to the horizontal axis X described above. By this step S104, as shown in FIG. 4, the left-right direction (longitudinal direction) of the virtual image V is aligned with the horizontal axis X, and the tilt of the virtual image V in the left-right direction is corrected.

[0025] Next, a method for setting the target rotation angle θi in the memory 25e by the target rotation angle setting system 85 will be described with reference to the flowchart of FIG. 1, the target rotation angle setting system 85 is configured separately from the vehicle 200, and is used during the manufacturing stage of the vehicle 200 having the head-up display device 100. The target rotation angle setting system 85 includes a camera 80 and a target rotation angle setting device 90. The target rotation angle setting device 90 is configured by a computer. First, a display image D that is not tilted, that is, whose display image rotation angle θd is zero, is displayed on the display surface 11a (step S201). In this state, the camera 80 captures the virtual image V at the viewpoint position of the viewer 1 (step S202). Then, the target rotation angle setting device 90 receives the video data from the camera 80 and acquires the target rotation angle θi (step S203). As shown in Fig. 3, the target rotation angle θi is the tilt angle of the virtual image V formed by the left-right direction (longitudinal direction) of the virtual image V with respect to the horizontal axis X extending in the left-right direction as seen by the viewer 1. This tilt of the virtual image V occurs due to the mounting tolerance of the head-up display device 100 to the vehicle 200 and the mounting tolerance of the internal components of the head-up display device 100. In step S203, the target rotation angle setting device 90 may acquire the target rotation angle θi by its own image analysis, or may input the target rotation angle θi acquired by an operator based on the image captured by the camera 80. Finally, the target rotation angle setting device 90 stores the acquired target rotation angle θi in the memory 25e (step S204). This completes the setting of the target rotation angle θi in the memory 25e.

[0026] The target rotation angle setting system 85 may be configured as a part of the vehicle 200. In this case, the camera 80 is an on-board camera, and the target rotation angle setting device 90 is the control unit 25.

[0027] (effect) According to the embodiment described above, the following effects are achieved. (1) The head-up display device 100 displays a virtual image V, which is an example of a projection image, by projecting display light L corresponding to the display image D emitted from the display surface 11a that displays the display image D onto a windshield 201, which is an example of a projection target member. The head-up display device 100 includes a correction display processing unit 25d that displays the display image D on the display surface 11a in a tilted state by rotating it by a display image rotation angle θd around a position within the display image D as a rotation center Cp, so as to adjust (suppress) the tilt of the virtual image V in the left-right direction as seen by the viewer. The display image rotation angle θd is set to be larger than a virtual image rotation angle θi, which is an example of a projection image rotation angle that is the angle of tilt of the virtual image V in the left-right direction when the display image D is displayed on the display surface 11a without being tilted. The display image D and the virtual image V have a correspondence relationship such that by rotating the display image D by the display image rotation angle θd, the virtual image V rotates by the same angle as the virtual image rotation angle θi. According to this configuration, the display image rotation angle θd is set taking into consideration that the correspondence relationship between the rotation angle changes of the display image D and the virtual image V is not a 1:1 ratio. Therefore, by rotating the display image D by the display image rotation angle θd, the tilt of the virtual image V can be adjusted more accurately.

[0028] (2) The correction display processing unit 25d acquires the virtual image rotation angle θi, applies a correction to the acquired virtual image rotation angle θi (a correction by dividing the virtual image rotation angle θi by a correction coefficient a less than 1) to acquire the display image rotation angle θd, and rotates the display image D by the acquired display image rotation angle θd and displays it in a tilted state. According to this configuration, the virtual image rotation angle θi is corrected to obtain the display image rotation angle θd, taking into consideration that the correspondence between the rotation angles of the display image D and the virtual image V is not one-to-one. Therefore, by rotating the display image D by the display image rotation angle θd, the tilt of the virtual image V can be adjusted more accurately.

[0029] (3) The head-up display device 100 includes a panel rotation device 15, which is an example of a display surface angle adjustment unit, that adjusts an angle Dv, which is an example of a surface angle of the display surface 11a in the vertical direction with respect to the center of the optical axis of the display light L emitted from the display surface 11a, in order to tilt the virtual image V in the forward / backward direction relative to the height direction (vertical axis Y direction) as seen by the viewer. The correction display processing unit 25d sets a correction coefficient a, which specifies the amount of correction to the virtual image rotation angle θi when obtaining the display image rotation angle θd, according to the angle Dv. The inventors of the present application have found that the corresponding relationship between the rotation angle change of the display image D and the virtual image V changes depending on the angle Dv of the display surface 11a (see FIGS. 6 to 8). According to the above configuration, based on this knowledge, the display image rotation angle θd suitable for the angle Dv of the display surface 11a is acquired, so that the tilt of the virtual image V can be adjusted more accurately.

[0030] (4) The correction coefficient a, which is less than 1 and divides the virtual image rotation angle θi, is set to be smaller as the angle Dv increases, thereby increasing the amount of correction. The inventors of the present application have found that as the angle Dv of the display surface 11a increases, the rate of change in the virtual image rotation angle θi relative to the change in the display image rotation angle θd decreases, and the amount of correction needs to be increased (see Figures 5 to 8). According to the above configuration, the larger the angle Dv, the larger the correction amount for the virtual image rotation angle θi for obtaining the display image rotation angle θd is set, so that the inclination of the virtual image V can be adjusted more accurately.

[0031] (5) The image rotation angle setting method for the head-up display device 100, which displays a virtual image V by projecting display light L corresponding to the display image D emitted from the display surface 11a that displays the display image D onto the windshield 201, includes the following steps: a first step of photographing the virtual image V with the camera 80; a second step of a target rotation angle setting device 90, which is an example of a computer, acquiring a virtual image rotation angle θi from image data from the camera 80; and a third step of the target rotation angle setting device 90 acquiring a display image rotation angle θd from the acquired virtual image rotation angle θi and setting the display image rotation angle θd in the head-up display device 100. The head-up display device 100 includes a correction display processing unit 25d that displays the display image D on the display surface 11a in a tilted state by rotating it by the display image rotation angle θd acquired in the third step around a position within the display image D as the rotation center Cp, so as to more accurately adjust the tilt of the virtual image V in the left-right direction as seen by the viewer. The display image rotation angle θd is set to be larger than the virtual image rotation angle θi, which is the angle of left-right tilt of the virtual image V that occurs when the display image D is displayed on the display surface 11a without being tilted. The display image D and the virtual image V have a corresponding relationship in which, by rotating the display image D by the display image rotation angle θd, the virtual image V rotates by the same angle as the virtual image rotation angle θi. According to this configuration, as described above, the tilt of the virtual image V can be adjusted more accurately.

[0032] The present disclosure is not limited to the above-described embodiments and drawings. Modifications (including deletion of components) may be made as appropriate within the scope of the present disclosure. An example of such a modification is described below.

[0033] (Variation) In the above embodiment, the head-up display device 100 has one display surface 11a, but is not limited to this. The head-up display device 100 may have multiple display surfaces, and the above-mentioned correction display processing may be performed separately on each display surface. Specifically, as shown in Fig. 12, the head-up display device 100a includes two display surfaces 111 and 112. The two display surfaces 111 and 112 are formed on the surfaces of different liquid crystal display panels. The angles Dv between the two display surfaces 111 and 112 are set to be different from each other. As a result, the angles of the virtual images V1 and V2 with respect to the vertical axis Y are different. In this example, the angle Dv of the display surface 112 is set to be larger than the angle Dv of the display surface 111. The virtual image V1 is displayed upright, and the virtual image V2 is displayed at an angle. The upper end of the virtual image V1 is connected to the lower end of the virtual image V2. The virtual image V2 is inclined from its lower end to its upper end so as to move toward the back side, farther from the viewer 1. 9 for each of the display surfaces 111 and 112. As a result, the display image D displayed on the display surface 111 is rotated by the display image rotation angle θd obtained when the correction coefficient a is 0.9, and the display image D displayed on the display surface 112 is rotated by the display image rotation angle θd obtained when the correction coefficient a is 0.7. Furthermore, the angle Dv for each of the display surfaces 111 and 112 may be fixed to different values, or may be variable by the panel rotation device 15.

[0034] The above-described modified example provides the following effects. The plurality of display surfaces 111, 112 are provided such that the vertical angles Dv of each of the display surfaces 111, 112 with respect to the optical axis center of the emitted display light L are different so that the plurality of virtual images V are displayed at different angles in the front-to-rear direction relative to the height direction as seen by the viewer. The correction display processing unit 25d sets, for each of the plurality of display surfaces 11a, a correction amount for the virtual image rotation angle θi when obtaining the display image rotation angle θd. The inventors of the present application have found that the corresponding relationship between the rotation angles of the display image D and the virtual image V changes depending on the angle Dv between the display surfaces 111 and 112 (see FIGS. 5 to 8). According to the above configuration, based on this knowledge, the display image rotation angle θd suitable for the angle Dv of the display surfaces 111 and 112 is acquired, so that the tilt of the virtual image V can be adjusted more accurately.

[0035] In the above embodiment, the target rotation angle acquisition unit 25a may acquire the target rotation angle θi from video data obtained by capturing a virtual image V and a real scene using a camera 80 mounted on the vehicle 200 while the head-up display device 100 is in use. For example, as shown in FIG. 11 , the target rotation angle acquisition unit 25a displays a virtual image V aligned with an object Fv (e.g., a vehicle ahead) in the real scene. The target rotation angle acquisition unit 25a may acquire the target rotation angle θi based on the left-right tilt of the virtual image V with respect to the object Fv. This allows for more accurate adjustment of the tilt of the virtual image V with respect to the object Fv, which is suitable for superimposed display, but it is also applicable to a configuration that does not perform superimposed display. Furthermore, the target rotation angle acquisition unit 25a may acquire information indicating the tilt of the vehicle 200 in the left-right direction from a gyro sensor (not shown) of the vehicle 200, and acquire the target rotation angle θi based on this information. This makes it possible to reduce the tilt of the virtual image V in the left-right direction.

[0036] The above-described modified example provides the following effects. The head-up display device 100 is mounted on a vehicle 200. The correction display processing unit 25d acquires a target rotation angle θi according to the tilt of the virtual image V with respect to the real scenery seen by the viewer captured by the camera 80, or the tilt of the vehicle 200 in the left-right direction. According to this configuration, the tilt of the virtual image V can be adjusted more accurately.

[0037] In the above embodiment, the head-up display device 100 may include a folding mirror that reflects the display light L from the display device 10 toward the concave mirror 30. This folding mirror is made of a plane mirror or a concave mirror. In the above embodiment, the mirror driving mechanism 35 may be omitted. In the above embodiment, the panel rotation device 15 may be omitted. In this case, the angle Dv is constant, and the display image rotation angle θd is obtained from the virtual image rotation angle θi using a coefficient a corresponding to this angle Dv.

[0038] In the above embodiment, the head-up display device 100 projects the display light L onto the windshield 201, which is an example of a projection target member, but the projection target member is not limited to this and may be a dedicated combiner.

[0039] In the above embodiment, the display device 10 is a type equipped with a liquid crystal display panel 11, but the type of the display device 10 is not limited to this, and may be a type equipped with an organic EL (Electro-Luminescence) display or a type equipped with a DMD (Digital Micromirror Device). The illumination device 12 may also be a laser scanning type illumination device. Furthermore, the position of the rotation center Cp may be shifted from the center position of the display image D.

[0040] Furthermore, in the above embodiment, the target rotation angle setting device 90 may acquire the target rotation angle θi, derive the display image rotation angle θd from the acquired target rotation angle θi and the coefficient a, and store this display image rotation angle θd in the memory 25e. That is, the target rotation angle setting device 90 may have the target rotation angle acquisition unit 25a, the correction coefficient acquisition unit 25b, and the display image rotation angle acquisition unit 25c. In this case, the head-up display device 100 only needs to perform processing in the correction display processing unit 25d, i.e., rotate and display the display image D by the display image rotation angle θd stored in the memory 25e, thereby reducing the processing load on the head-up display device 100. [Explanation of symbols]

[0041] 1...Viewer 10...display device, 11...display panel, 11a, 111, 112...display surface, 12...illumination device, 15...panel rotation device, 25...controller, 25a...target rotation angle acquisition unit, 25b...correction coefficient acquisition unit, 25c...display image rotation angle acquisition unit, 25d...corrected display processing unit, 25e...memory 30...Concave mirror 35...Mirror drive mechanism 60... housing, 60a... opening, 60b... window 80... camera, 85... target rotation angle setting system, 90... target rotation angle setting device 100, 100a...Head-up display device 200...vehicle, 201...windshield. D...display image, G...road surface, J, Ax...rotation axis, L...display light, V, V1, V2...virtual image, X, Xd...horizontal axis, Y...vertical axis, a...correction coefficient, θd...display image rotation angle, θi...target rotation angle, virtual image rotation angle, Cp...rotation center, Dv...angle, Fv...object

Claims

1. A head-up display device that displays a projection image by projecting display light corresponding to a display image emitted from a display surface that displays the display image onto a projection target, a correction display processing unit that displays the display image on the display surface in a tilted state by rotating it by a display image rotation angle around a position within the display image as a rotation center so as to adjust the tilt of the projected image in the left-right direction as seen by a viewer; the display image rotation angle is set to an angle larger than a projection image rotation angle, which is an angle of inclination in the left-right direction of the projection image that occurs when the display image is displayed on the display surface without being tilted, the display image and the projected image have a correspondence relationship such that, by rotating the display image by the display image rotation angle, the projected image rotates by the same angle as the projected image rotation angle; Head-up display device.

2. the corrected display processing unit acquires the projection image rotation angle, corrects the acquired projection image rotation angle to acquire the display image rotation angle, and rotates the display image by the acquired display image rotation angle and displays it in a tilted state. The head-up display device according to claim 1 .

3. a display surface angle adjustment unit that adjusts a surface angle of the display surface in a vertical direction with respect to a center of an optical axis of the display light emitted from the display surface in order to tilt the projected image in a front-to-rear direction with respect to a height direction as seen by a viewer; the correction display processing unit sets a correction amount for the projection image rotation angle when acquiring the display image rotation angle, according to the surface angle. The head-up display device according to claim 2 .

4. The display surface is provided in plurality, the plurality of display surfaces are provided such that the surface angles of the display surfaces in the vertical direction with respect to the optical axis center of the emitted display light are different from each other so that the plurality of projected images are displayed at different angles in the front-rear direction with respect to the height direction as seen by a viewer, the correction display processing unit sets a correction amount for the projection image rotation angle when acquiring the display image rotation angle for each of the plurality of display surfaces. The head-up display device according to claim 2 .

5. The head-up display device is mounted on a vehicle, the corrected display processing unit acquires the tilt of the projected image with respect to an actual scene captured by a camera or the projection image rotation angle corresponding to the tilt of the vehicle. The head-up display device according to claim 2 .

6. The larger the surface angle, the larger the correction amount. The head-up display device according to claim 3 or 4.

7. 1. A method for setting an image rotation angle of a head-up display device that displays a projected image by projecting, onto a projection member, display light corresponding to a display image emitted from a display surface that displays the display image, the display light comprising: a first step of capturing the projected image with a camera; a second step in which a computer acquires a projection image rotation angle based on image data from the camera; a third step in which the computer acquires a display image rotation angle from the acquired projection image rotation angle and sets the display image rotation angle in the head-up display device, The head-up display device a correction display processing unit that displays the display image on the display surface in a tilted state by rotating the display image by the display image rotation angle acquired in the third step around a position within the display image as a rotation center so as to adjust the tilt of the projected image in the left-right direction as seen by a viewer; the display image rotation angle is set to an angle larger than a projection image rotation angle, which is an angle of inclination in the left-right direction of the projection image that occurs when the display image is displayed on the display surface without being tilted, the display image and the projected image have a correspondence relationship such that, by rotating the display image by the display image rotation angle, the projected image rotates by the same angle as the projected image rotation angle; How to set the image rotation angle.

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