Head-up display device and mobile object

Abstract

The present invention makes it possible to display a virtual image of an image having difficult-to-recognize distortion in a depth direction.　A display region 100 has a first curved surface shape 110 with an upper end portion 111 and a lower end portion 113 that are viewed from a predetermined eye position within a visual field being disposed at positions closer to the visual field than a predetermined reference plane 300, and a central portion 112 viewed from the predetermined eye position being disposed at a position farther from the visual field than the reference plane 300, and is formed such that a first convergence angle difference between a convergence angle from the predetermined eye position to the upper end portion 111 and a convergence angle from the eye position to a first point 301 on the reference plane 300 through the upper end portion 111, a second convergence angle difference between a convergence angle to the central portion 112 and a convergence angle to a second point 302 on the reference plane 300 through the central portion 112, and a third convergence angle difference between a convergence angle to the lower end portion 113 and a convergence angle to a third point 303 on the reference plane 300 through the lower end portion 113 respectively fall within four milliradians.

Description

[Technical field]

[0001] The present invention relates to a head-up display device that displays a virtual image on a front windshield, a combiner, or the like of a vehicle, and to a moving body. [Background technology]

[0002] A head-up display device generates and displays a virtual image by using image light reflected from a reflective translucent member, such as the vehicle's front windshield or combiner, and superimposes the virtual image on the real scene (the scenery in front of the vehicle) that passes through the reflective translucent member. By minimizing the line of sight movement of the observer driving the vehicle, the head-up display device provides the observer with the information he or she desires through a virtual image, thereby contributing to safe and comfortable vehicle operation.

[0003] Since the front windshield (projection target member) is a curved surface, distortion occurs in the image projected onto this curved surface. The head-up display device also has a relay optical system with optical power, and the relay optical system and the projection target member allow the observer to visually recognize a virtual image that is an enlarged image. In other words, it can be said that the relay optical system and the projection target member form a virtual image optical system. If the observer's eye position is different, the optical path of the image light that reaches the eye position is different, that is, the optical power added to the image light by the virtual image optical system is also different. Therefore, image distortion occurs according to the change in the observer's eye position.

[0004] Patent document 1 describes a head-up display device that generates an image in advance (performs pre-distortion processing) with added distortion that is the opposite of the distortion that occurs in a virtual image optical system, thereby allowing the user to perceive an image with less distortion when viewed as a virtual image. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2015-87619 A Summary of the Invention [Problem to be solved by the invention]

[0006] Distortions that occur in a virtual image optical system include not only distortions in the left-right and up-down directions as seen by the observer, but also distortions in the depth direction. For example, even if you want to display the entire virtual image on a single plane, if there is a large distortion in the depth direction, the virtual image perceived by the observer will not be perceived as being on a flat surface, which is expected to cause discomfort.

[0007] The present invention has been made in consideration of the above circumstances, and has an object to provide a head-up display device capable of displaying a virtual image of an image in which distortion in the depth direction is difficult to perceive. Specifically, the present invention has an object to provide a head-up display device capable of displaying a virtual image of an image in which distortion in the depth direction is difficult to perceive even when the eye positions are different within the viewing zone. [Means for solving the problem]

[0008] In an embodiment of the head-up display device of the present invention, the display device includes a display having a display surface that emits image light, and a relay optical system that directs the image light from the display device 21 to a viewing zone in the vehicle via a projection portion, and causes a virtual image of the image to be visually recognized within a display area seen from within the viewing zone, the display area including an upper end, a lower end, and a center between the upper end and the lower end, the upper end and the lower end as seen from a predetermined eye position within the viewing zone being located at a position closer to the viewing zone than a predetermined reference plane, and the center as seen from the predetermined eye position being located at a position farther from the viewing zone than the reference plane, or the upper end and the lower end as seen from the predetermined eye position being , and the second curved shape is positioned farther from the viewing zone than a specified reference plane, and the central part as viewed from the specified eye position is positioned closer to the viewing zone than the reference plane, and is formed so that each of the following is within 4 milliradians: a first convergence angle difference between the convergence angle from the eye position to the upper end and the convergence angle from the eye position to a first point on the reference plane passing through the upper end, a second convergence angle difference between the convergence angle from the eye position to the central part and the convergence angle from the eye position to a second point on the reference plane passing through the central part, and a third convergence angle difference between the convergence angle from the eye position to the lower end and the convergence angle from the eye position to a third point on the reference plane passing through the lower end. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is an explanatory diagram showing a vehicle provided with a display system for a moving object according to the first embodiment. [Diagram 2] FIG. 2 is an explanatory diagram showing the configuration of the head-up display device of FIG. [Diagram 3] FIG. 3 is a block diagram showing the display control device of FIG. [Figure 4A] FIG. 4A shows the convergence angle from both eyes at predetermined positions in the viewing zone toward the top edge of the display area in a display system for a mobile object of the first embodiment, and the convergence angle toward a first point on a reference plane that overlaps with this top edge. [Figure 4B] Figure 4B shows the convergence angle from both eyes at predetermined positions in the viewing zone toward the middle area of ​​the display area in the first embodiment of the display system for a mobile body, and the convergence angle toward a second point on the reference plane that overlaps with this middle area. [Figure 4C] Figure 4C shows the convergence angle from both eyes at predetermined positions in the viewing zone toward the bottom edge of the display area in the first embodiment of the display system for a moving object, and the convergence angle toward a third point on the reference plane that overlaps with this bottom edge. [Figure 5A] FIG. 5A is a diagram showing the arrangement of the display area when viewed from a lower part of the viewing zone in the display system for a moving body of the first embodiment. [Figure 5B] FIG. 5B is a diagram showing the arrangement of the display area when viewed from above the viewing zone in the display system for a moving body of the first embodiment. [Figure 6] FIG. 6 is a diagram showing the arrangement of display areas in the display system for a moving body of the first embodiment. [Figure 7] FIG. 7 is an explanatory diagram showing a vehicle provided with a display system for a moving object according to the second embodiment. [Figure 8] FIG. 8 is an explanatory diagram showing the configuration of the head-up display device of FIG. [Figure 9A] Figure 9A shows the convergence angle from both eyes at predetermined positions in the viewing zone toward the top edge of the display area in a display system for a mobile body of the second embodiment, and the convergence angle toward a first point on a reference plane that overlaps with this top edge. [Figure 9B] Figure 9B shows the convergence angle from both eyes at predetermined positions in the viewing zone toward the middle area of ​​the display area in a display system for a mobile body of the second embodiment, and the convergence angle toward a second point on the reference plane that overlaps with this middle area. [Figure 9C] Figure 9C shows the convergence angle from both eyes at predetermined positions in the viewing zone toward the bottom edge of the display area in a display system for a moving body of the second embodiment, and the convergence angle toward a third point on the reference plane that overlaps with this bottom edge. [Figure 10A] FIG. 10A is a diagram showing the arrangement of the display area when viewed from a lower part of the viewing zone in a display system for a moving body according to the second embodiment. [Figure 10B] FIG. 10B is a diagram showing the arrangement of the display area when viewed from above the viewing zone in the display system for a moving body of the second embodiment. [Figure 11] FIG. 11 is a diagram showing the arrangement of display areas in a display system for a moving body according to the second embodiment. [Figure 12A] FIG. 12A is a diagram showing the arrangement of a relay optical system and a display surface according to the first embodiment. [Figure 12B] FIG. 12B is a diagram showing the shape and arrangement of a display area formed by the head-up display device of FIG. 12A. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] 1 to 6, 12A, and 12B, a description will be given of the configuration of a display system for a moving body and a head-up display device according to a first embodiment. Also, a description will be given of the configuration of a display system for a moving body and a head-up display device according to a second embodiment in Figs. 7 to 11. The present invention is not limited to the following embodiments (including the contents of the drawings). Of course, the following embodiments can be modified (including the deletion of components). In addition, in the following description, descriptions of known technical matters are omitted as appropriate in order to facilitate understanding of the present invention.

[0011] Please refer to FIG. 1. A display system 10 for a moving body is composed of a HUD (Head-Up Display) device 20, a display control device 30 that controls the HUD device 20, and a projection target member 2. FIG. 1 shows a case where the display system for a moving body according to this embodiment is adopted in an automobile, but it can be adopted in a display device in a moving body other than an automobile. In the description of this embodiment, the left-right direction when an observer (typically, the driver of the vehicle 1) sitting in the driver's seat of the vehicle 1 faces forward of the vehicle 1 is defined as the X axis (the left direction is the X axis positive direction), the up-down direction is defined as the Y axis (the up direction is the Y axis positive direction), and the front-rear direction is defined as the Z axis (the forward direction is the Z axis positive direction).

[0012] The HUD device 20 emits image light 40 toward the windshield (one example of the projection target member 2), and the projection target member 2 reflects the image light 40 of the image M displayed by the HUD device 20 into the viewing zone 200. By positioning the eye position 4 within the viewing zone 200, the observer can visually recognize a virtual image of the image M displayed by the HUD device 20 at a position overlapping the foreground, which is the real space visually recognized through the projection target member 2.

[0013] The "visible zone" used in the description of this embodiment is (1) a zone in which all of the virtual images of the image M in the display zone 100 can be seen, and at least a part of the virtual images of the image M cannot be seen outside the zone, (2) a zone in which all of the virtual images of the image M can be seen at a predetermined luminance or more, and a part of the virtual images of the image M has a luminance less than the predetermined luminance outside the zone, or (3) a zone in which at least a part of the virtual images can be viewed stereoscopically within the zone, and no part of the virtual images can be viewed stereoscopically outside the zone, when the HUD device 20 can display a virtual image that can be viewed stereoscopically. That is, when the observer's eye position 4 is placed outside the visible zone 200, the observer cannot view a part of the virtual images of the image M, the visibility of a part of the virtual images of the image M is very low and difficult to perceive, or the virtual images of the image M cannot be viewed stereoscopically. The predetermined luminance is, for example, about 1 / 50 of the luminance of the virtual images of the image M viewed at the center of the visible zone.

[0014] 2 is a diagram showing the configuration of the HUD device 20 of this embodiment. The HUD device 20 includes a display 21 having a display surface for displaying an image, and a relay optical system 25.

[0015] The display 21 in FIG. 2 is a projection type display including a projector 22 (an example of an image generating unit) and a screen (an example of a display surface 23) that receives projected light from the projector 22 and displays an image (real image). The display 21 may be a transmissive display (an example of an image generating unit) that transmits light from a backlight such as an LCD, or may be a self-luminous display (an example of an image generating unit). In these cases, the display surface is a display surface (an example of a display surface 23) in a transmissive display, and is a screen (an example of a display surface 23) in a projection type display. The display surface is arranged at an angle inclined from a perpendicular angle to an optical axis 40p of image light 40 that travels from the display surface toward the viewing zone (the center of the viewing zone) via a relay optical system 25 and a projection target member 2, which will be described later, and thus the display area 100 can be arranged along the road surface 310.

[0016] Furthermore, the display device 21 may be provided with an actuator (not shown) including a motor controlled by the display control device 30, so that the display surface 23 can be moved and / or rotated.

[0017] The relay optical system 25 is disposed on the optical path of the light of the image from the display 21 (light traveling from the display 21 toward the viewing zone) between the display 21 and the projection target 2, and is composed of one or more optical components that project the light of the image from the display 21 onto the projection target 2 outside the HUD device 20. The relay optical system 25 in FIG. 2 includes one concave first mirror 26 and one flat second mirror 27. Note that, although the relay optical system 25 includes two mirrors in this embodiment, the relay optical system 25 is not limited to this, and may include, in addition to or instead of these, one or more refractive optical components such as lenses, diffractive optical components such as holograms, reflective optical components, or a combination of these.

[0018] The relay optical system 25 has two rotation axes (first rotation axis AX1, second rotation axis AX2) that move the viewing zone 200 in the up-down direction (Y-axis direction). The first rotation axis AX1 and the second rotation axis AX2 are set so as not to be perpendicular to the left-right direction (X-axis direction) of the vehicle 1 (in other words, not parallel to the YZ plane) when the HUD device 20 is attached to the vehicle 1. Specifically, the angle between the first rotation axis AX1 and the second rotation axis AX2 and the left-right direction (X-axis direction) of the vehicle 1 is set to less than 45 degrees, and more preferably less than 20 degrees.

[0019] When the relay optical system 25 is rotated about the first rotation axis AX1, the amount of vertical movement of the display area 100 is relatively small, and the amount of vertical movement of the viewing area 200 is relatively large. When the relay optical system 25 is rotated about the second rotation axis AX2, the amount of vertical movement of the display area 100 is relatively large, and the amount of vertical movement of the viewing area 200 is relatively small. In other words, when comparing the first rotation axis AX1 and the second rotation axis AX2, the "amount of vertical movement of the viewing area 200 / amount of vertical movement of the display area 100" caused by the rotation about the first rotation axis AX1 is greater than the "amount of vertical movement of the viewing area 200 / amount of vertical movement of the display area 100" caused by the rotation about the second rotation axis AX2. In other words, the relative amount between the vertical movement of the display area 100 and the vertical movement of the viewing zone 200 due to rotation of the relay optical system 25 about the first rotation axis AX1 is different from the relative amount between the vertical movement of the display area 100 and the vertical movement of the viewing zone 200 due to rotation of the relay optical system 25 about the second rotation axis AX2.

[0020] The HUD device 20 includes a first actuator 28 that rotates the first mirror 26 about a first rotation axis AX1, and a second actuator 29 that rotates the first mirror 26 about a second rotation axis AX2. In other words, the HUD device 20 rotates one relay optical system 25 about two axes (the first rotation axis AX1 and the second rotation axis AX2). Note that the first actuator 28 and the second actuator 29 may be integrated into one two-axis actuator.

[0021] Furthermore, the HUD device 20 in another embodiment rotates the two relay optical systems 25 about two axes (a first rotation axis AX1 and a second rotation axis AX2). For example, the HUD device 20 may include a first actuator 28 that rotates the first mirror 26 about the first rotation axis AX1 and a second actuator 29 that rotates the second mirror 27 about the second rotation axis AX2.

[0022] Note that the arrangement of the first rotation axis AX1 and the second rotation axis AX2 is not limited to this, so long as the rotation of the first rotation axis AX1 causes a relatively large amount of vertical movement of the viewing zone 200, and the rotation of the second rotation axis AX2 causes a relatively large amount of vertical movement of the display area 100. Furthermore, the driving by the actuator may include movement in addition to or instead of rotation.

[0023] Also, the HUD device 20 in other embodiments may not drive the relay optics 25. In other words, the HUD device 20 may not have an actuator that rotates and / or turns the relay optics 25. The HUD device 20 in this embodiment may have a wide viewing zone 200 that covers the range of eye heights of drivers who are expected to use the vehicle 1.

[0024] Fig. 3 is a block diagram of a display system 10 for a mobile object. A display control device 30 includes one or more I / O interfaces 31, one or more processors 33, one or more image processing circuits 35, and one or more memories 37. The various functional blocks depicted in Fig. 3 may be configured in hardware, software, or a combination of both.

[0025] As shown, the processor 33 and the image processing circuitry 35 are operatively coupled to the memory 37. More specifically, the processor 33 and the image processing circuitry 35 can execute programs stored in the memory 37 to operate the mobile display system 10, for example, to generate and / or transmit image data. The processor 33 and / or the image processing circuitry 35 can include at least one general-purpose microprocessor (e.g., a central processing unit (CPU)), at least one application specific integrated circuit (ASIC), at least one field programmable gate array (FPGA), or any combination thereof. The memory 37 can include any type of magnetic medium, such as a hard disk, any type of optical medium, such as a CD and a DVD, any type of semiconductor memory, such as a volatile memory, and a non-volatile memory. The volatile memory can include DRAM and SRAM, and the non-volatile memory can include ROM and NVRAM.

[0026] As shown in the figure, the processor 33 is operably coupled to the I / O interface 31. The I / O interface 31 communicates with, for example, a vehicle ECU 401 provided in the vehicle and / or other electronic devices (reference numerals 403 to 417 described later) according to the CAN (Controller Area Network) standard (also referred to as CAN communication). Note that the communication standard adopted by the I / O interface 31 is not limited to CAN, and includes, for example, wired communication interfaces such as CANFD (CAN with Flexible Data Rate), LIN (Local Interconnect Network), Ethernet (registered trademark), MOST (Media Oriented Systems TransPort: MOST is a registered trademark), UART, or USB, or in-vehicle communication (internal communication) interfaces that are short-range wireless communication interfaces within several tens of meters, such as a personal area network (PAN) such as a Bluetooth (registered trademark) network, a local area network (LAN) such as an 802.11x Wi-Fi (registered trademark) network, etc. In addition, the I / O interface 31 may include an external communication (external communication) interface such as a wide area communication network (e.g., an Internet communication network) based on cellular communication standards such as a wireless wide area network (WWAN0, IEEE802.16-2004 (WiMAX: Worldwide InteroPerability for Microwave Access)), IEEE802.16e-based (Mobile WiMAX), 4G, 4G-LTE, LTE Advanced, and 5G.

[0027] As shown in the figure, the processor 33 is interoperably connected to the I / O interface 31, thereby enabling information to be exchanged with various other electronic devices connected to the display system 10 for a mobile object (I / O interface 31). For example, a vehicle ECU 401, a road information database 403, a vehicle position detection unit 405, an external sensor 407, an operation detection unit 409, an eye position detection unit 411, a gaze direction detection unit 413, a mobile information terminal 415, and an external communication device 417 are operably connected to the I / O interface 31. The I / O interface 31 may include a function of processing (converting, calculating, analyzing) information received from other electronic devices connected to the display system 10 for a mobile object.

[0028] The display 21 is operatively coupled to the processor 33 and the image processing circuitry 35. Thus, the image displayed by the image display unit 20 may be based on image data received from the processor 33 and / or the image processing circuitry 35. The processor 33 and the image processing circuitry 35 control the image displayed by the image display unit 20 based on information obtained from the I / O interface 31.

[0029] The display area 100 generated by the HUD device 20 is a curved or partially curved area, and is also called an imaging surface. The display area 100 is a position where a virtual image of the display surface 23 (see FIG. 1) of the display 21 of the HUD device 20 is formed, that is, the display area 100 corresponds to a display surface of the HUD device 20 described later (in other words, the display area 100 has a conjugate relationship with the display surface of the display 21 described later), and it can be said that the virtual image viewed in the display area 100 corresponds to an image M displayed on the display surface 23 of the HUD device 20 described later. It is preferable that the display area 100 itself has low visibility to the extent that it is not actually viewed by the observer or is difficult to view. Below, an embodiment of the display area 100 generated by the HUD device 20 will be described.

[0030] (First embodiment) The display system 10 (HUD device 20) for a moving body according to the first embodiment is optically designed so that the first display region 110, which is arranged when viewed from the viewing zone 200, has a recessed shape on the viewing zone 200 side in the cross-sectional shape of the first display region 110 in a plane (YZ plane) parallel to the longitudinal and vertical directions of the vehicle 1, as shown in Fig. 1. That is, based on a line segment connecting an upper end 111 and a lower end 113 of the first display region 110, a middle region between the upper end 111 and the lower end 113 (including a central portion 112 which is the center between the upper end 111 and the lower end 113 when the observer views the first display region 110) is arranged away from the viewing zone 200.

[0031] In Figure 1, a reference plane 300 that is not curved (has no curvature) in the left-right direction (X-axis) or the up-down direction (Y-axis) of the vehicle 1 is virtually set in front of the vehicle 1, and the display system 10 for a moving body (HUD device 20) of the first embodiment is arranged such that the upper end 111 and lower end 113 are closer to the viewing zone 200 than this reference plane 300, and the center part 112 is arranged farther from the viewing zone 200 than the reference plane 300.

[0032] Please refer to Figures 4A to 4C. Figures 4A to 4C are diagrams showing the convergence angle toward each point of the display area generated by the HUD device and the convergence angle toward each point on the reference plane overlapping with each point. In Figures 4A to 4C, θHUD indicates the convergence angle toward each point (upper end 111, center 112, and lower end 113) in the display area 100 from both eyes (right eye 4R, left eye 4L) at a predetermined position in the viewing zone 200, and θsp indicates the convergence angle toward each point (first point 301, second point 302, and third point 303) on the reference plane 300 where the lines connecting the centers of both eyes (right eye 4R, left eye 4L) and each point (upper end 111, center 112, and lower end 113) of the display area 100 intersect.

[0033] 4A shows the convergence angle from both eyes (right eye 4R, left eye 4L) at a predetermined position in the viewing zone 200 toward the upper end 111 of the first display region 110, and the convergence angle toward a first point 301 on the reference plane 300 that overlaps with this upper end 111. Here, the first display region 110 (upper end 111) is closer to the predetermined position in the viewing zone 200 than the reference plane 300 (first point 301), i.e., the convergence angle θHUD11 toward the upper end 111 of the first display region 110 is greater than the convergence angle θsp11 toward the first point 301 on the reference plane 300.

[0034] 4B shows the convergence angle from both eyes (right eye 4R, left eye 4L) at a predetermined position in the viewing zone 200 toward the center 112 of the first display region 110, and the convergence angle toward a second point 302 on the reference plane 300 that overlaps with the upper end 111. Here, the first display region 110 (center 112) is farther from the predetermined position in the viewing zone 200 than the reference plane 300 (second point 302), i.e., the convergence angle θHUD12 toward the center 112 of the first display region 110 is smaller than the convergence angle θsp12 toward the second point 302 on the reference plane 300.

[0035] 4C shows the convergence angle from both eyes (right eye 4R, left eye 4L) at a predetermined position in the viewing zone 200 toward the bottom end 113 of the first display region 110, and the convergence angle toward a third point 303 on the reference plane 300 that overlaps with this bottom end 113. Here, the first display region 110 (bottom end 113) is closer to the predetermined position in the viewing zone 200 than the reference plane 300 (third point 303), i.e., the convergence angle θHUD13 toward the bottom end 113 of the first display region 110 is greater than the convergence angle θsp13 toward the third point 303 on the reference plane 300.

[0036] The difference between θHUD and θsp is called the convergence angle difference P (P11, P12, P13 in FIG. 1). It is preferable to set this convergence angle difference within a predetermined value (threshold) θth. In other words, by setting the amount of displacement of the convergence angle caused by the deviation between the imaging point of the virtual image and the virtual plane (reference plane) relative to this imaging point within the threshold θth, it is possible to make it difficult for the viewer to perceive the distance deviation (also called the focus deviation). In this embodiment, for example, by setting the convergence angle difference P11 (the difference between the convergence angle θHUD11 and the convergence angle θsp11) between the upper end 111 of the first display area 110 and the reference plane 300, the convergence angle difference P12 (the difference between the convergence angle θHUD12 and the convergence angle θsp12) between the central part 112 of the first display area 110 and the reference plane 300, and the convergence angle difference P13 (the difference between the convergence angle θHUD13 and the convergence angle θsp13) between the lower end 113 of the first display area 110 and the reference plane 300 within the threshold value θth, the shape of the first display area 110 is approximated to a plane (the reference plane 300), i.e., the virtual image displayed in the first display area 110 is easily perceived by the observer as being displayed on a plane.

[0037] Table 1 shows the calculation results of the convergence angle difference [mrad] between two points as seen from both eyes (assuming an average interpupillary distance of 65 [mm]). The first distance is between 2 and 10 [m], and the second distance is between 5 and 10 [m], and the numerical value at each intersection represents the convergence angle difference [mrad] between the first and second distances. For example, if the first distance is 6 [m] and the second distance is 7 [m], the convergence angle difference between the two points as seen from both eyes (assuming an average interpupillary distance of 65 [mm]) is 3.7 [mrad].

[0038] [Table 1]

[0039] The applicant has recognized that by setting the convergence angle difference between two points within 4 [mrad] (0.23 [degree]), the distance difference between two points in the depth direction is difficult to perceive, and more preferably by setting it to 2 [mrad] (0.11 [degree]), the distance difference between two points is even more difficult to perceive. In Table 1, the area where the convergence angle difference between two points is 4 [mrad] is surrounded and filled with a thick line. For example, if the first distance is 6 [m], the convergence angle difference between two points is in the range of 5 to 9 [m] (specifically, 4.4 to 9.5 [m]) and the distance difference is difficult to perceive. Therefore, the threshold θth of the convergence angle difference can be set to 4 [mrad], more preferably 2 [mrad].

[0040] The reference plane 300 is set so that the convergence angle differences P11, P12, and P13 are equal to those of the display area 100 disposed when viewed from a predetermined viewing area reference position 200s in the viewing area 200. In some embodiments, the viewing area reference position 200s is set to a predetermined position between the viewing area center 205 and the viewing area bottom end 203 in the vertical direction (Y-axis direction) of the viewing area 200. This will be described later. The shape and arrangement of the display area 100 change depending on the eye position 4 of the viewer.

[0041] 5A is a diagram showing the first display area 110a arranged when viewed from the viewing zone lower end 202 of the viewing zone 200. As a comparative example, the first display area 110s arranged when viewed from the viewing zone reference position 200s is shown by a dotted line. In the first display area 110a arranged when viewed from the viewing zone lower end 203, the upper end 111a and the center 112a are arranged at a position farther from the viewing zone 200 than the reference plane 300, and the lower end 113 is arranged at a position closer to the viewing zone 200 than the reference plane 300. Comparing the display area 100s and the first display area 110a, the position of the upper end 111a changes significantly, but since it straddles the reference plane 300, the change (increase) in the distance difference (convergence angle difference P11) with respect to the movement amount of the upper end 111 can be suppressed.

[0042] 5B is a diagram showing the first display area 110b arranged when viewed from the viewing zone upper end 201 of the viewing zone 200. As a comparative example, the first display area 110s arranged when viewed from the viewing zone reference position 200s is shown by a dotted line. In the first display area 110b arranged when viewed from the viewing zone upper end 201, the lower end 113b and the central portion 112b are arranged at a position farther from the viewing zone 200 than the reference plane 300, and the upper end 111 is arranged at a position closer to the viewing zone 200 than the reference plane 300. Comparing the display area 100s and the first display area 110b, the position of the lower end 113b changes significantly, but since it straddles the reference plane 300, the change (increase) in the distance difference (convergence angle difference P13) with respect to the movement amount of the lower end 113b can be suppressed.

[0043] When the projection target member 2 of the vehicle 1 is the front windshield, the change in the shape and arrangement of the display area 100 due to the change in eye position is relatively large in the lower area of ​​the viewing area 200 (for example, the area below the viewing area center 205) and is relatively small in the upper area of ​​the viewing area 200 (for example, the area above the viewing area center 205). Therefore, the HUD device 20 of this embodiment sets a predetermined position between the viewing area center 205 and the viewing area lower end 203 in the vertical direction (Y-axis direction) of the viewing area 200 as the viewing area reference position 200s, and sets the shape and arrangement of the display area 100 when viewed from this viewing area reference position 200s so that each point (upper end 111, central portion 112, lower end 113) of the display area 100 is close to the desired reference plane 300. Specifically, the display area 100 is formed so that the first convergence angle difference P11, the second convergence angle difference P12, and the third convergence angle difference P13 from the viewing zone reference position 200s are approximately equal. This makes it possible to reduce deviation from the desired reference plane 300 even when the eye position 4 is different within the viewing zone 200. In the above embodiment, the shape and arrangement of the display area 100 and the range of the viewing zone 200 are set so that the upper end 111 straddles the reference plane 300 at the viewing zone lower end 203 (see FIG. 5A), and the lower end 113 straddles the reference plane 300 at the viewing zone upper end 201 (see FIG. 5B), but only one of them may be set. That is, for example, the upper end 111 may straddle the reference plane 300 at the viewing zone lower end 203 (see FIG. 5A), and the lower end 113 may not straddle the reference plane 300 at the viewing zone upper end 201. In this embodiment, at the lower edge 203 of the viewing zone, the upper edge 111 does not straddle the reference plane 300 (see FIG. 5A), and at the upper edge 201 of the viewing zone, the lower edge 113 may not straddle the reference plane 300.

[0044] In addition, in the HUD device 20 of some embodiments, the shape and arrangement of the display area 100 and the range of the viewing area 200 may be set so that the maximum value of the convergence angle difference P between the first display area 110a and the reference plane 300 when the eye position 4 is at the lower end 203 of the viewing area is approximately equal to the maximum value of the convergence angle difference P between the first display area 110b and the reference plane 300 when the eye position 4 is at the upper end 201 of the viewing area. Specifically, for example, in the HUD device 20, the shape and arrangement of the display area 100 and the range of the viewing area 200 may be set so that the convergence angle difference P11 between the upper end 111a of the first display area 110a and the reference plane 300 when the eye position 4 is at the lower end 203 of the viewing area is approximately equal to the convergence angle difference P13 between the lower end 113b of the first display area 110b and the reference plane 300 when the eye position 4 is at the upper end 201 of the viewing area. As a result, even if the eye position 4 varies within the viewing zone 200, the deviation from the desired reference plane 300 can be reduced.

[0045] In the above embodiment, the first curved first display area 110 is concave toward the viewing zone 200 in the left-right direction (X-axis) of the vehicle 1. In addition, the first display area 110 may be concave toward the viewing zone 200 in the up-down direction (Y-axis) of the vehicle 1. The display system 10 for a moving body (HUD device 20) in this embodiment is optically designed so that the first display area 110 arranged when viewed from the viewing zone 200 has a concave shape on the viewing zone 200 side in the cross-sectional shape of the first display area 110 in a plane (ZX plane) parallel to the front-rear and left-right directions of the vehicle 1, as shown in FIG. 6. That is, based on a line segment connecting the left end 116 and the right end 117 of the first display area 110, a middle area between the left end 116 and the right end 117 (including the center 112 that is the center between the left end 116 and the right end 117 when the observer views the first display area 110) is arranged away from the viewing zone 200.

[0046] 6, in the display system 10 for a moving body (HUD device 20) according to the first embodiment, the first display region 110, which is disposed when the centers of both eyes are placed at the center of the viewing zone 200 in the horizontal direction, has a left end 116 and a right end 117 disposed at positions closer to the viewing zone 200 than the reference plane 300, and a center 112 disposed at a position farther from the viewing zone 200 than the reference plane 300. The first display region 110, which is disposed when the centers of both eyes are placed to the right of the center of the viewing zone 200 in the horizontal direction, has a left end 116 and a center 112 disposed at positions farther from the viewing zone 200 than the reference plane 300, and a right end 117 disposed at a position closer to the viewing zone 200 than the reference plane 300. Conversely, in the first display region 110 arranged when the centers of both eyes are placed to the left of the center in the horizontal direction of the viewing zone 200, the right end 117 and the center 112 are arranged at a position farther from the viewing zone 200 than the reference plane 300, and the left end 116 is arranged at a position closer to the viewing zone 200 than the reference plane 300. That is, the shape and arrangement of the display region 100 and the range of the viewing zone 200 are set so that the left end 116 straddles the reference plane 300 in the right part of the viewing zone (not shown) and the right end 117 straddles the reference plane 300 in the left part of the viewing zone (not shown), but only one of them may be set. That is, for example, the left end 116 may straddle the reference plane 300 in the right part of the viewing zone (not shown), and the right end 117 may not straddle the reference plane 300 in the left part of the viewing zone (not shown). In this embodiment, there may be cases where the left end 116 does not straddle the reference plane 300 in the right part of the viewing zone, and the right end 117 does not straddle the reference plane 300 in the left part of the viewing zone.

[0047] Second embodiment The display system 10 (HUD device 50) for a moving body according to the second embodiment is optically designed so that the second display area 120, which is arranged when viewed from the viewing zone 200, has a convex shape on the viewing zone 200 side in a cross section of the second display area 120 in a plane (YZ plane) parallel to the front-rear and up-down directions of the vehicle 1, as shown in Fig. 7. That is, based on a line segment connecting an upper end 121 and a lower end 123 of the second display area 120, a middle area between the upper end 121 and the lower end 123 (including a central area 122 which is the center between the upper end 121 and the lower end 123 when the observer views the second display area 120) is arranged near the viewing zone 200.

[0048] 8, the HUD device 50 differs from the HUD device 20 of the first embodiment in that the image light 40 in the vertical direction is crossed by the relay optical system 55. As a result, the second display area 120 generated by the HUD device 50 of the second embodiment can be made to be convex in the opposite direction to the first display area 110 generated by the HUD device 20 of the first embodiment.

[0049] In Figure 7, a reference plane 300 that is not curved (has no curvature) in the left-right direction (X-axis) and the up-down direction (Y-axis) of the vehicle 1 is virtually set in front of the vehicle 1, and the display system 10 for a moving body (HUD device 50) of the second embodiment has an upper end 121 and a lower end 123 positioned farther from the viewing zone 200 than the reference plane 300, and a center portion 122 positioned closer to the viewing zone 200 than the reference plane 300.

[0050] Please refer to Figures 9A to 9C. Figures 9A to 9C are diagrams showing the convergence angles toward each point in the display area generated by the HUD device of the second embodiment, and the convergence angles toward each point on the reference plane that overlaps with each point.

[0051] 9A shows the convergence angle from both eyes (right eye 4R, left eye 4L) at a predetermined position (viewing zone reference position 200s) in the viewing zone 200 toward the upper end 121 of the second display area 120, and the convergence angle toward a first point 301 on the reference plane 300 that overlaps with this upper end 121. Here, the second display area 120 (upper end 121) is farther from the predetermined position in the viewing zone 200 than the reference plane 300 (first point 301), that is, the convergence angle θHUD21 toward the upper end 121 of the second display area 120 is smaller than the convergence angle θsp21 toward the first point 301 on the reference plane 300.

[0052] 9B shows the convergence angle from both eyes (right eye 4R, left eye 4L) at a predetermined position (viewing zone reference position 200s) in the viewing zone 200 toward the center 122 of the second display area 120, and the convergence angle toward a second point 302 on the reference plane 300 that overlaps with the upper end portion 121. Here, the second display area 120 (center 122) is closer to the predetermined position in the viewing zone 200 than the reference plane 300 (second point 302), i.e., the convergence angle θHUD22 toward the center 122 of the second display area 120 is greater than the convergence angle θsp22 toward the second point 302 on the reference plane 300.

[0053] 9C shows the convergence angle from both eyes (right eye 4R, left eye 4L) at a predetermined position (viewing zone reference position 200s) in the viewing zone 200 toward the bottom end 123 of the second display area 120, and the convergence angle toward a third point 303 on the reference plane 300 that overlaps with this bottom end 123. Here, the second display area 120 (bottom end 123) is farther from the predetermined position in the viewing zone 200 than the reference plane 300 (third point 303), that is, the convergence angle θHUD23 toward the bottom end 123 of the second display area 120 is smaller than the convergence angle θsp23 toward the third point 303 on the reference plane 300.

[0054] The difference between θHUD and θsp is referred to as the convergence angle difference P (P21, P22, P23 in FIG. 7). In this embodiment, for example, the convergence angle difference P21 (the difference between the convergence angle θHUD21 and the convergence angle θsp21) between the upper end 121 of the second display region 120 and the reference plane 300, the convergence angle difference P22 (the difference between the convergence angle θHUD22 and the convergence angle θsp22) between the center 122 of the second display region 120 and the reference plane 300, and the convergence angle difference P23 (the difference between the convergence angle θHUD23 and the convergence angle θsp23) between the lower end 123 of the second display region 120 and the reference plane 300 are set within the threshold value θth, so that the shape of the second display region 120 is approximated to a plane (the reference plane 300), that is, the virtual image displayed in the second display region 120 is easily perceived by the observer as being displayed on a plane.

[0055] The reference plane 300 is set with respect to the display area 100 arranged when viewed from a predetermined viewing area reference position 200s in the viewing area 200 so that the convergence angle differences P21, P22, and P23 are equal.

[0056] 10A is a diagram showing the second display area 120a arranged when viewed from the viewing zone lower end 203 of the viewing zone 200. As a comparative example, the second display area 120s arranged when viewed from the viewing zone reference position 200s is shown by a dotted line. In the second display area 120a arranged when viewed from the viewing zone lower end 203, the upper end 121a, the central portion 122a, and the lower end 123a are arranged at positions farther from the viewing zone 200 than the reference plane 300. Comparing the display area 100s and the second display area 120a, since the central portion 122a straddles the reference plane 300, the change amount (increase amount) of the distance difference (convergence angle difference P22) with respect to the movement amount of the central portion 122 can be suppressed.

[0057] 10B is a diagram showing the second display area 120b arranged when viewed from the viewing zone upper end 201 of the viewing zone 200. As a comparative example, the second display area 120s arranged when viewed from the viewing zone reference position 200s is shown by a dotted line. In the second display area 120b arranged when viewed from the viewing zone upper end 201, the lower end 123b and the central portion 122b are arranged at a position closer to the viewing zone 200 than the reference plane 300, and the upper end 121 is arranged at a position farther from the viewing zone 200 than the reference plane 300. Comparing the display area 100s and the second display area 120b, the position of the lower end 123b changes significantly, but since it straddles the reference plane 300, the change (increase) in the distance difference (convergence angle difference P23) with respect to the movement amount of the lower end 123 can be suppressed.

[0058] Similarly, in the HUD device 50 of the second embodiment, when the projection target member 2 of the vehicle 1 is the front windshield, the change in the shape and arrangement of the display area 100 due to the change in eye position is relatively large in the lower area of ​​the viewing zone 200 (for example, the area below the viewing zone center 205). The change in the shape and arrangement of the display area 100 due to the change in eye position is relatively small in the upper area of ​​the viewing zone 200 (for example, the area above the viewing zone center 205). Therefore, in the HUD device 50 of this embodiment, a predetermined position between the viewing zone center 205 and the viewing zone lower end 203 in the vertical direction (Y-axis direction) of the viewing zone 200 is set as the viewing zone reference position 200s, and the shape and arrangement of the display area 100 when viewed from this viewing zone reference position 200s are set so that each point (upper end 121, center 122, lower end 123) of the display area 100 is close to the desired reference plane 300. This makes it possible to reduce the deviation from the desired reference plane 300 even if the eye position 4 is different within the viewing zone 200. In the above embodiment, the shape and arrangement of the display region 100 and the range of the viewing zone 200 are set so that the central portion 122 straddles the reference plane 300 at the viewing zone lower end 203 (see FIG. 10A) and the lower end 123 straddles the reference plane 300 at the viewing zone upper end 201 (see FIG. 10B). However, only one of these may be set. That is, for example, the upper end 121 may straddle the reference plane 300 at the viewing zone lower end 203 (see FIG. 10A) and the lower end 123 may not straddle the reference plane 300 at the viewing zone upper end 201. Also, in the present embodiment, there may be a case where the upper end 121 does not straddle the reference plane 300 at the viewing zone lower end 203 (see FIG. 10A) and the lower end 123 does not straddle the reference plane 300 even at the viewing zone upper end 201.

[0059] In addition, in the HUD device 50 of some embodiments, the shape and arrangement of the display area 100 and the range of the viewing area 200 may be set so that the maximum value of the convergence angle difference P between the second display area 120a and the reference plane 300 when the eye position 4 is at the lower end 203 of the viewing area is approximately equal to the maximum value of the convergence angle difference P between the second display area 120b and the reference plane 300 when the eye position 4 is at the upper end 201 of the viewing area. Specifically, for example, in the HUD device 50, the shape and arrangement of the display area 100 and the range of the viewing area 200 may be set so that the convergence angle difference P21 between the upper end 121 of the second display area 120a and the reference plane 300 when the eye position 4 is at the lower end 203 of the viewing area is approximately equal to the convergence angle difference P23 between the lower end 123b of the second display area 120b and the reference plane 300 when the eye position 4 is at the upper end 201 of the viewing area. As a result, even if the eye position 4 varies within the viewing zone 200, the deviation from the desired reference plane 300 can be reduced.

[0060] In the above embodiment, the second display area 120 having the first curved shape is convex toward the viewing zone 200 in the left-right direction (X-axis) of the vehicle 1. However, in addition to this, the second display area 120 may also be convex toward the viewing zone 200 in the up-down direction (Y-axis) of the vehicle 1. The display system 10 for a moving body (HUD device 50) in this embodiment is optically designed so that the second display area 120 arranged when viewed from the viewing zone 200 is a shape that protrudes toward the viewing zone 200 side in the cross-sectional shape of the second display area 120 in a plane (ZX plane) parallel to the front-rear and left-right directions of the vehicle 1, as shown in FIG. 11. That is, based on a line segment connecting the left end 126 and the right end 127 of the second display area 120, a middle area between the left end 126 and the right end 127 (including the center 122 that is the center between the left end 126 and the right end 127 when the observer views the second display area 120) is arranged at a position closer to the viewing zone 200 than the reference plane 300.

[0061] 11, in the display system 10 for a moving body (HUD device 50) according to the second embodiment, the second display region 120, which is disposed when the centers of both eyes are placed at the center of the horizontal direction of the viewing zone 200, has a left end 126 and a right end 127 disposed at positions closer to the viewing zone 200 than the reference plane 300, and a center 122 disposed at a position farther from the viewing zone 200 than the reference plane 300. The second display region 120, which is disposed when the centers of both eyes are placed to the right of the center of the horizontal direction of the viewing zone 200, has a left end 126 and a center 122 disposed at positions farther from the viewing zone 200 than the reference plane 300, and a right end 127 disposed at a position closer to the viewing zone 200 than the reference plane 300. Conversely, the second display area 120, which is positioned when the centers of both eyes are placed to the left of the left-right center of the viewing zone 200, has a right end 127 and a center 122 positioned farther from the viewing zone 200 than the reference plane 300, and a left end 126 positioned closer to the viewing zone 200 than the reference plane 300.

[0062] Next, an example of setting the shape and arrangement of the display area 100 by adjusting the optical characteristics of the entire area or part of the area in the virtual image optical system 90 (concave mirror 26) and adjusting the arrangement of an optical element (e.g., concave mirror 26) and the display surface 23 will be described.

[0063] FIG. 12A is a diagram showing the arrangement of the relay optical system 25 and the display surface 23 in the first embodiment. In FIG. 12A, the focal points of the regions 251, 252, and 253 of the relay optical system 25 are denoted by symbols 251f, 252f, and 253f in order to easily understand the difference from the comparative example, but the distance relationship with the relay optical system 25 or the display surface 23 is not accurately shown. The display surface 23 in this embodiment is arranged at an angle α from a perpendicular plane 23a to the optical axis 40p of the image light 40 traveling from the display surface 23 to the viewing zone 200. Specifically, the display surface 23 is arranged such that a region 231 of the display surface 23 corresponding to the upper end 111 (see FIG. 12B) of the first display region 110 as seen from the observer is farther away from the relay optical system 25 and a region 232 of the display surface 23 corresponding to the center 112 (see FIG. 12B) is closer to the relay optical system 25 than the perpendicular plane 23a. The relay optical system 25 in this embodiment has a different radius of curvature for each region. Specifically, a first optical power of a first region (first optical path) 251 of the relay optical system 25 through which the first image light 41 that displays a virtual image at the upper end 111 of the first display region 110 as seen by the driver passes is made smaller than a second optical power of a second region (second optical path) 252 of the relay optical system 25 through which the second image light 42 that displays a virtual image at the center 112 that is viewed below the upper end 111 of the first display region 110 as seen by the driver passes. That is, when the main optical power of the relay optical system 25 is caused by the first mirror 26 that is a concave mirror, a first radius of curvature (an example of the first optical power) of the first region 251 that reflects the first image light 41 is made larger than a second radius of curvature (an example of the second optical power) of the second region 252 that reflects the second image light 42. When the first radius of curvature of the first region 251 that reflects the first image light 41 becomes large, the focal length (½ of the radius of curvature) of the focal point 251f of the first region 251 becomes long.

[0064] Here, the following relational expression holds between the distance a (>0) between the object and the concave mirror, the distance b (>0) between the virtual image and the concave mirror, and the focal length f (>a) of the concave mirror. According to this relational expression, the larger the radius of curvature of the concave mirror (the smaller the mirror curvature), the longer the focal length of the concave mirror will be, and the longer the focal length, the shorter the distance b of the virtual image will be. 1 / a-1 / b=1 / f

[0065] As described above, by arranging the display surface 23 at an angle with respect to the optical axis 40p of the image light traveling from the display surface 23 toward the viewing zone 200, the first display region 110 can also be arranged so as to follow the road surface 310 (so that the imaging distance gradually increases from the vicinity to the distance). The first image light 41 projected from the display surface 23 to the first region 251 having a large radius of curvature of the first mirror 26 has a long focal length (the distance from the first region 251 to the focal point 251f) and therefore, when reflected by the projection target member 2, the imaging distance from the projection target member 2 becomes shorter (compared to the case where the radius of curvature is not large).

[0066] In the relay optical system 25 of this embodiment, the optical power is gradually decreased (the radius of curvature is gradually increased) as the virtual image displayed by the passing image light is located on the upper side, so that the upper end 111 of the first display area 110 can be curved so as to rise from the inclination along the road surface 310. Curving the upper end 111 so as to rise from the inclination along the road surface 310 means that, as shown in Fig. 12B, the tilt angle θ (first tilt angle θ1) between the tangent of the first display area 110 at the upper end 111 and the road surface 310 is larger than the tilt angle θ (second tilt angle θ2) between the tangent of the first display area 110 at the center 112, which is closer to the driver than the upper end 111, and the tilt angle θ increases continuously (monotonically increases) from the center 112 (nearby side) toward the upper end 111 (far side).

[0067] In other words, the HUD device 20 (as well as the HUD device 50) can set the shape and arrangement of the display area 100 (110, 120) by adjusting the optical properties of the entire area or part of the area in the virtual image optical system 90, by adjusting the arrangement of the optical members (e.g., concave mirror 26; 56) and the display surface 23, by adjusting the shape of the display surface 23, or a combination of these.

[0068] As described above, the head-up display device 20; 50 of the present embodiment includes a display 21 having a display surface 23 that emits image light, and relays the image light 40 from the display 21 through the projection member 2 toward the viewing area 200 in the vehicle 1 to view a virtual image of the image displayed on the display surface 23 within the display area 100 viewed from within the viewing area 200. An optical system 25, the display area 100 includes an upper end portion 111; 121, a lower end portion 113: 123, and a central portion 112; 122 between the upper end portion 111 and the lower end portion 113, 1) the upper end portion 111 and the lower end portion 113 viewed from a predetermined eye position 200s within the viewing area 200 are disposed at positions closer to the viewing area 200 than a predetermined reference plane 300, and the central portion 112 viewed from the predetermined eye position 200s is disposed at a position farther from the viewing area 200 than the reference plane 300. A first curved surface shape 110, or 2) the upper end portion 121 and the lower end portion 123 viewed from a predetermined eye position 200s are disposed at positions farther from the viewing area 200 than a predetermined reference plane 300, and the central portion 122 viewed from the predetermined eye position 200s is disposed at a position closer to the viewing area 200 than the reference plane 300. A second curved surface shape 120, and the first convergence angle difference P11: P21 between the convergence angle from the eye position 200s to the upper end portion 111; 121 and the convergence angle from the eye position 200s to the first point 301 on the reference plane 300 passing through the upper end portion 111; 121, and the eye position 200s to the center portion 112; 122. The second convergence angle difference P12; P22 between the convergence angle and the convergence angle from the eye position 200s to the second point 302 on the reference plane 300 passing through the central portion 112; 122, and the eye position 200s to the lower end portion 113; 123. And the third convergence angle difference P13; P23 between the convergence angle and the convergence angle from the eye position 200s to the third point 303 on the reference plane 300 passing through the lower end portion 113; 123 are each formed to be within 4 milliradians. The display area, which is the area for displaying the virtual image, is arranged in a shape that is concave on the viewing area side so that the upper and lower ends are on the front side and the middle area is on the back side from a desired plane, and the convergence angle difference between the upper end, the lower end, and the middle area and the desired plane is set within 4 milliradians. By doing so, it is possible to make it difficult to recognize the distortion in the depth direction of the virtual image displayed within the display area, and even when the eye position is shifted in the vertical direction, a local increase in the convergence angle difference between the desired plane and the display area can be suppressed.In addition, by positioning the display area, which is the area where the virtual image is displayed, in a shape that protrudes toward the viewing area, with the upper and lower ends facing back from the desired plane and the middle area facing forward, and setting the convergence angle difference between the upper and lower ends and the middle area and the desired plane to within 4 milliradians, it is possible to make it difficult to perceive depth-wise distortion of the virtual image displayed in the display area, and to suppress local increases in the convergence angle difference between the desired plane and the display area even if the eye position shifts in the vertical direction.

[0069] In some embodiments, the display area 100 may be formed such that, when viewed from the viewing area upper end 201 of the viewing area 200, the upper end 111 viewed from the viewing area 200 is disposed at a position closer to the viewing area 200 than the reference plane 300, and the lower end 113 and the central portion 112 are disposed at a position farther from the viewing area 200 than the reference plane 300, and / or, when viewed from the lower end 203 of the viewing area 200, the lower end 113 viewed from the viewing area 200 is disposed at a position closer to the viewing area 200 than the reference plane 300, and the upper end 111 and the central portion 112 are disposed at a position farther from the viewing area 200 than the reference plane 300. In this way, the range of the viewing area (the upper end or the lower end of the viewing area) is set to a range in which the upper end or the lower end of the display area straddles the desired plane in the depth direction, so that a wide range of the viewing area is ensured, and a local increase in the convergence angle difference between the desired plane and the display area can be suppressed even if the eye position is shifted in the vertical direction within the viewing area.

[0070] In some embodiments, the display area 100 may be formed such that, when viewed from the viewing area upper end 201 of the viewing area 200, the upper end 121 is disposed at a position farther from the viewing area 200 than the reference plane 300, and the lower end 123 and the central portion 122 are disposed at a position closer to the viewing area 200 than the reference plane 300, and / or, when viewed from the lower end 203 of the viewing area 200, the lower end 123 is disposed at a position farther from the viewing area 200 than the reference plane 300, and the upper end 121 and the central portion 122 are disposed at a position closer to the viewing area 200 than the reference plane 300. In this way, the range of the viewing area (the upper end or the lower end of the viewing area) is set to a range in which the upper end or the lower end of the display area straddles the desired plane in the depth direction, so that a wide range of the viewing area is ensured, and a local increase in the convergence angle difference between the desired plane and the display area can be suppressed even if the eye position is shifted in the vertical direction within the viewing area.

[0071] In some embodiments, the predetermined eye position 200s may be disposed between the viewing zone center 205 and the lower end 203, and the display area 100 may be formed such that the first convergence angle difference P11, the second convergence angle difference P12, and the third convergence angle difference P13 from the predetermined eye position 200s are substantially equal. The magnitude of change in the shape and arrangement of the display area 100 differs depending on whether the eye position is shifted upward or downward within the viewing zone. In other words, the rate of change in the shape and arrangement of the display area 100 relative to the amount of upward shift of the eye position within the viewing zone differs from the rate of change in the shape and arrangement of the display area 100 relative to the amount of downward shift of the eye position within the viewing zone. Therefore, when the rate of change in the shape and arrangement of the display area 100 with respect to the amount of downward displacement is large, by disposing the viewing zone reference position 200s, where the first convergence angle difference P11, the second convergence angle difference P12, and the third convergence angle difference P13 are approximately equal, between the viewing zone center 205 and the lower end 203, it is possible to suppress a local increase in the convergence angle difference between the desired plane and the display area even if the eye position 4 becomes the viewing zone lower end 203 of the viewing zone 200. Note that the predetermined eye position 200s may be disposed between the viewing zone center 205 and the viewing zone upper end 201.

[0072] In some embodiments, the reference plane 300 may be a tangent to a circle from the viewing zone center 205. This allows the display area, which is concave or convex as viewed from the center of the viewing zone, to be arranged substantially directly opposite each other, and even if the eye position changes within the viewing zone, the amount of deviation in the depth direction from the reference plane can be kept small.

[0073] Also, in some embodiments, the reference plane 300 may be positioned such that it is a tangent to a circle from the field of view center 205 and is non-parallel to the vehicle's direction of travel.

[0074] Also, in some embodiments, the reference plane 300 may be tilted such that the top side is located further away from the viewing zone 200 than the bottom side. [Explanation of symbols]

[0075] 1: Vehicle 2:Projected member 4: Eye position 4L: left eye 4R:Right eye 10: Display system 20: Head-up display device (HUD device) 21: Display 22: Projector 23:Display surface 23a: Vertical surface 25: Relay optical system 26: First mirror 27: 2nd mirror 40p: Optical axis 41: First image light 42: Second image light 50:HUD device 55: Relay optical system 90: Virtual image optical system 100:Display area 100s:Display area 110: 1st display area (1st curved surface shape) 111: Upper end 112: Center 113: Bottom end 116: Left end portion 117: Right end portion 120: Second display area (second curved surface shape) 121: Upper end portion 122: Central portion 123: Lower end portion 126: Left end portion 127: Right end portion 200: Field of view 200s: Field of view reference position (predetermined eye position) 201: Upper end of the field of view 203: Lower end of the field of view 205: Center of the field of view 310: Road surface M: Image P: Convergence angle difference P11: First convergence angle difference P12: Second convergence angle difference P13: Third convergence angle difference

Claims

1. A display (21) that emits image light corresponding to an image (M) displayed on a display surface (23); The image light from the display (21) is directed to a visual field (200) in the vehicle via a projected portion; A relay optical system (25) that allows a virtual image of the image (M) to be viewed within a display area (100) as viewed from within the viewing zone (200), The display area (100) includes an upper end (111; 121), a lower end (113: 123), and a central portion (112; 122) between the upper end (111) and the lower end (113), A first curved shape (110) in which the upper end (111) and the lower end (113) as viewed from a predetermined eye position (200s) in the viewing zone (200) are located closer to the viewing zone (200) than a predetermined reference plane (300), and the center (112) as viewed from the predetermined eye position (200s) is located farther from the viewing zone (200) than the reference plane (300); or The upper end (121) and the lower end (123) as viewed from the predetermined eye position (200s) are disposed at a position farther from the viewing zone (200) than a predetermined reference plane (300), and the center (122) as viewed from the predetermined eye position (200s) is disposed at a position closer to the viewing zone (200) than the reference plane (300), which is a second curved shape (120); a first convergence angle difference (P11:P21) between the convergence angle from the eye position (200s) to the upper end (111;121) and the convergence angle from the eye position (200s) to a first point (301) on the reference plane (300) passing through the upper end (111;121); A second convergence angle difference (P12; P22) between the convergence angle from the eye position (200s) to the center (112; 122) and the convergence angle from the eye position (200s) to a second point (302) on the reference plane (300) passing through the center (112; 122), and The reference plane (300) is formed such that a third convergence angle difference (P13; P23) between the convergence angle from the eye position (200s) to the lower end (113; 123) and the convergence angle from the eye position (200s) to a third point (303) on the reference plane (300) passing through the lower end (113; 123) is within 4 milliradians. Head-up display device.

2. The display area (100) is When viewed from the upper end (201) of the viewing zone (200), the upper end (111) is located closer to the viewing zone (200) than the reference plane (300), and the lower end (113) and the center (112) are located farther from the viewing zone (200) than the reference plane (300); and / or When viewed from the lower end (203) of the viewing zone (200), the lower end (113) is located closer to the viewing zone (200) than the reference plane (300), and the upper end (111) and the center (112) are located farther from the viewing zone (200) than the reference plane (300). The head-up display device according to claim 1 .

3. The display area (100) is When viewed from the upper end (201) of the viewing zone (200), the upper end (121) is located farther from the viewing zone (200) than the reference plane (300), and the lower end (123) and the central portion (122) are located closer to the viewing zone (200) than the reference plane (300); and / or When viewed from the lower end (203) of the viewing zone (200), the lower end (123) is disposed at a position farther from the viewing zone (200) than the reference plane (300), and the upper end (121) and the central portion (122) are disposed at positions closer to the viewing zone (200) than the reference plane (300). The head-up display device according to claim 1 .

4. The predetermined eye position (200s) is disposed between the center (202) and the lower end (203) of the viewing zone (200); The display area (100) is The first convergence angle difference (P11), the second convergence angle difference (P12), and the third convergence angle difference (P13) from the predetermined eye position (200s) are formed so as to be equal. The head-up display device according to claim 1 .

5. The display area (100) is formed such that the upper end (111; 121), the central portion (112; 122), and the lower end (113; 123) are arranged so as to have the reference plane (300) that is non-parallel to the direction of travel of the vehicle. The head-up display device according to claim 4.

6. The display area (100) is formed such that the upper end (111; 121), the center (112; 122), and the lower end (113; 123) are arranged so as to have the reference plane (300) arranged at an angle such that the upper side is arranged farther away than the lower side when viewed from the viewing zone (200). The head-up display device according to claim 1 .

7. A display (21) that emits image light corresponding to an image (M) displayed on a display surface (23); A projection target member (2), The image light from the display (21) is directed to a visual field (200) within the vehicle via the projection target (2); A relay optical system (25) that allows a virtual image of the image (M) to be viewed within a display area (100) as viewed from within the viewing zone (200), The display area (100) includes an upper end (111; 121), a lower end (113: 123), and a central portion (112; 122) between the upper end (111) and the lower end (113), A first curved shape (110) in which the upper end (111) and the lower end (113) as viewed from a predetermined eye position (200s) in the viewing zone (200) are located closer to the viewing zone (200) than a predetermined reference plane (300), and the center (112) as viewed from the predetermined eye position (200s) is located farther from the viewing zone (200) than the reference plane (300); or The upper end (121) and the lower end (123) as viewed from the predetermined eye position (200s) are disposed at a position farther from the viewing zone (200) than a predetermined reference plane (300), and the center (122) as viewed from the predetermined eye position (200s) is disposed at a position closer to the viewing zone (200) than the reference plane (300), which is a second curved shape (120); a first convergence angle difference (P11:P21) between the convergence angle from the eye position (200s) to the upper end (111;121) and the convergence angle from the eye position (200s) to a first point (301) on the reference plane (300) passing through the upper end (111;121); A second convergence angle difference (P12; P22) between the convergence angle from the eye position (200s) to the center (112; 122) and the convergence angle from the eye position (200s) to a second point (302) on the reference plane (300) passing through the center (112; 122), and The reference plane (300) is formed such that a third convergence angle difference (P13; P23) between the convergence angle from the eye position (200s) to the lower end (113; 123) and the convergence angle from the eye position (200s) to a third point (303) on the reference plane (300) passing through the lower end (113; 123) is within 4 milliradians. Mobile body.

8. The display area (100) is When viewed from the upper end (201) of the viewing zone (200), the upper end (111) is located closer to the viewing zone (200) than the reference plane (300), and the lower end (113) and the center (112) are located farther from the viewing zone (200) than the reference plane (300); and / or When viewed from the lower end (203) of the viewing zone (200), the lower end (113) is located closer to the viewing zone (200) than the reference plane (300), and the upper end (111) and the center (112) are located farther from the viewing zone (200) than the reference plane (300). The moving body according to claim 7.

9. The display area (100) is When viewed from the upper end (201) of the viewing zone (200), the upper end (121) is located farther from the viewing zone (200) than the reference plane (300), and the lower end (123) and the center (122) are located closer to the viewing zone (200) than the reference plane (300); and / or When viewed from the lower end (203) of the viewing zone (200), the lower end (123) is located farther from the viewing zone (200) than the reference plane (300), and the upper end (121) and the center (122) are located closer to the viewing zone (200) than the reference plane (300). The moving body according to claim 7.

10. The predetermined eye position (200s) is disposed between the center (202) and the lower end (203) of the viewing zone (200); The display area (100) is The first convergence angle difference (P11), the second convergence angle difference (P12), and the third convergence angle difference (P13) from the predetermined eye position (200s) are formed so as to be equal. The moving body according to claim 7.

11. The display area (100) is formed such that the upper end (111; 121), the central portion (112; 122), and the lower end (113; 123) are arranged so as to have the reference plane (300) that is non-parallel to the direction of travel of the vehicle. The moving body according to claim 10.

12. The display area (100) is formed such that the upper end (111; 121), the center (112; 122), and the lower end (113; 123) are arranged so as to have the reference plane (300) arranged at an angle such that the upper side is arranged farther away than the lower side when viewed from the viewing zone (200). The moving body according to claim 7.

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