WO2024105899A1

WO2024105899A1 - Head-up display device and vehicle

Info

Publication number: WO2024105899A1
Application number: PCT/JP2023/013135
Authority: WO
Inventors: 利昌永井; 啓之梶川; 千明金野
Original assignee: マクセル株式会社
Priority date: 2022-11-17
Filing date: 2023-03-30
Publication date: 2024-05-23
Also published as: JP2024073084A

Abstract

This head-up display device is mounted to a vehicle, the device comprising an image light output device and an image light projection device. The image light output device emits an image light and is disposed in front of and above a user. The image light projection device projects the image light from the image light output device toward a windshield.

Description

Head-up display device and vehicle

The present invention relates to a head-up display device and a vehicle equipped with the head-up display device.

Head-up displays (sometimes referred to as HUDs) mounted on vehicles and the like are known. For example, Patent Document 1 discloses "a head-up display device, comprising: an image display device having a light source and a display element, which displays an image on the display element and generates and emits image light; a virtual image optical system including a mirror and a correction lens, which displays a virtual image in front of the vehicle by reflecting the image projection light emitted from the image display device by a windshield or a combiner of the vehicle; and a housing, in which the display element and the virtual image optical system are disposed in a space formed by the housing, and the correction lens is disposed within the housing between the display element and the mirror."

JP 2022-27798 A

When displaying a good image on an image light reflecting surface in front of the user, for example, on a vehicle's image display device, it is necessary to optimize the angle of light incidence on the windshield and ensure there is enough space inside the dashboard to accommodate the optical system. However, it is often not possible to secure a large space inside the dashboard, as frames, pipes, instruments and their holders are installed inside the dashboard. Therefore, there is a challenge in realizing a HUD layout that can be installed in a vehicle even when some or all of the head-up display device cannot be stored inside the dashboard.

According to a first aspect of the present invention, there is provided a head-up display device as described below. This head-up display device is mounted on a vehicle and includes an image light output device disposed in front of and above a user, and an image light projection unit that projects image light from the image light output device toward a windshield in front of the user.

According to a second aspect of the present invention, there is provided a head-up display device as described below. This head-up display device is mounted on a vehicle and includes an image light output device that emits image light including S-polarized light and P-polarized light in front of and above a user, and an image light projection unit that reflects and projects the image light including S-polarized light and P-polarized light from the image light output device toward the windshield in front of the user. The image light projection unit includes a first mirror that reflects S-polarized light and transmits P-polarized light, and a second mirror that reflects P-polarized light and transmits S-polarized light, and the first mirror and the second mirror are disposed at different positions in the vertical direction.

According to a third aspect of the present invention, there is provided a head-up display device as described below. This head-up display device is mounted on a vehicle such that the path of image light directed downward in front of the user and the line of sight of the user viewing a virtual image based on the image light reflected toward the windshield do not overlap with the range of motion of a movable object installed within the vehicle.

　Also, a vehicle equipped with the above-mentioned head-up display device is provided.

According to the present invention, it is possible to display images while reducing or eliminating the proportion of the interior space of the dashboard. Problems, configurations, and effects other than those described above will become clear from the description of the embodiment of the invention below.

1 is a diagram for explaining an overview of a vehicle equipped with a HUD device; FIG. 2 is a functional block diagram showing a configuration example of a HUD device. 3 is a functional block diagram showing a configuration example related to a vehicle information acquisition unit in FIG. 2; 1 is a diagram illustrating an example of a structure and layout of a HUD device according to a first embodiment. FIG. FIG. 11 is a diagram illustrating an example of the structure and layout of a HUD device according to a second embodiment. FIG. 6 is a diagram showing another example different from that shown in FIG. 5 . FIG. 11 is a diagram showing an example of a layout in which a reflecting mirror is disposed inside a dashboard according to a first modified example. FIG. 11 is a diagram showing an example of a layout in which a reflecting mirror is disposed inside a dashboard according to a first modified example. FIG. 11 is a diagram for explaining an example of a layout including a video display device according to Modification 1. FIG. 11 is a diagram showing an example of a solar protection measure according to the second modification. FIG. 11 is a diagram showing another example different from that shown in FIG. 10 . FIG. 12 is a diagram showing another example different from that shown in FIGS. FIG. 13 is a diagram showing another example different from that shown in FIGS. 13A and 13B are diagrams illustrating an example of a case in which a plurality of virtual images are displayed at different display positions and display distances according to Modification 3. FIG. 15 is an enlarged view of the image display device portion in the structure of FIG. 14 . FIG. 2 is an enlarged view of an image light projection unit. FIG. 15 is a diagram showing an example of a structure different from that shown in FIG. 14 . FIG. 18 is an enlarged view of the image display device portion in the structure of FIG. 17. FIG. 18 is a diagram showing an example of a structure different from those in FIGS. 14 and 17 . FIG. 20 is an enlarged view of the image display device portion in the structure of FIG. 19 .

Below, an embodiment of the present invention will be described in detail with reference to the drawings. In the drawings, the same parts are generally given the same reference numerals, and repeated explanations will be omitted. In the drawings, the depiction of each component may not represent the actual position, size, shape, range, etc., in order to facilitate understanding of the invention.

For the purpose of explanation, when describing processing by a program, the program, functions, processing units, etc. may be described as the main focus, but the main hardware focus for these is the processor, or a controller, device, computer, system, etc. that is composed of the processor. The computer executes processing according to the program read into the memory by the processor, appropriately using resources such as memory and communication interfaces. This realizes the specified functions, processing units, etc. The processor is composed of semiconductor devices such as a CPU or GPU, for example. The processor is composed of devices or circuits that are capable of performing specified calculations. Processing is not limited to software program processing, and can also be implemented by dedicated circuits. Dedicated circuits that can be used include FPGAs, ASICs, CPLDs, etc.

First, we will explain the overview of the HUD device, etc., with reference to Figures 1 to 3.

[HUD device and vehicle]
Fig. 1 is a schematic diagram showing a configuration example of a vehicle 2 equipped with a head-up display device (HUD device) 1. The HUD device 1 in Fig. 1 is equipped in the vehicle 2, and the vehicle in the present invention is a vehicle. The vehicle 2 is typically an automobile, but is not necessarily limited thereto, and may be a railroad car, an airplane, or the like in some cases. In Fig. 1, with respect to the vehicle 2 and the driver, the horizontal direction is the left-right direction, the lateral direction of the vehicle, or the width direction of the vehicle, the vertical direction is the up-down direction or longitudinal direction of the vehicle, and the horizontal direction perpendicular to the lateral direction of the vehicle is the front-rear direction of the vehicle or the traveling direction of the vehicle.

The HUD device 1 acquires vehicle information 4 from various sensors installed in various parts of the vehicle 2. The various sensors, for example, detect various events that occur in the vehicle 2 and periodically detect the values of various parameters related to the driving conditions. The vehicle information 4 includes, for example, the speed information and gear information of the vehicle 2, steering wheel steering angle information, lamp illumination information, external light information, distance information, infrared information, engine ON/OFF information, camera image information, acceleration gyro information, GPS (Global Positioning System) information, navigation information, vehicle-to-vehicle communication information, and road-to-vehicle communication information. The camera image information includes in-vehicle camera image information and outside-vehicle camera image information. The GPS information includes latitude and longitude as well as current time information.

The HUD device 1 uses the image display unit 12 (Fig. 2) to project an image onto the display area 5 of the windshield 3 based on such vehicle information 4. In this way, the HUD device 1 allows the driver of the vehicle 2 (from the driver's viewpoint) to view the scenery in which the projected image is superimposed as a corresponding virtual image 9.

FIG. 2 is a functional block diagram showing an example of the configuration of the main parts of the control system in the HUD device 1 in FIG. 1. Also, FIG. 3 is a functional block diagram showing an example of the configuration related to the vehicle information acquisition unit 15, which is a part related to the acquisition of the vehicle information 4 in FIG. 2.

The HUD device 1 (virtual image display device) includes an image display unit 12. It also includes a control device 10 that controls the image display unit 12, and a solar radiation sensor 66 that detects sunlight. The control device 10 is, for example, configured as an electronic control unit (ECU). The layout of the image display unit 12 will be explained in detail later using figures. The control device 10 may be mounted inside or outside the housing.

[Image display unit]
The image display unit 12 includes an image display device or image light output device 35 that emits image light. The image display device 35 is, for example, a display panel such as an LCD (Liquid Crystal Display) or a projector, and displays an image based on input image data and emits image light of the displayed image. The image display device 35 in the embodiment of the present invention includes a light source device 100 and a display panel 64. The image display device 35 is a projector (projection type image display device) that projects an image formed on the display panel 64 using light (in other words, light source light) emitted from the light source device 100. The light source device 100 is typically configured to include an LED (Light Emitting Diode) light source.

The display panel 64 is typically a liquid crystal display (LCD) panel having an image display element. The display panel 64 creates an image based on the image data input instructed by the control device, and displays it on the display screen of the display panel 64. The display panel 64 forms an image to be projected onto the display area 5 by modulating the transmittance of light from the light source device 100 for each pixel according to the image data, and emits it as image light (in other words, projection light).

In addition, the display panel 64 is not limited to a liquid crystal panel, but may be a screen plate with a diffusion function. Means for projecting an image onto a screen plate with a diffusion function may include a means for projecting an image of a DMD (Digital Micromirror Device) or a liquid crystal panel in combination with a projection lens, or a means using Micro Electro Mechanical Systems.

The light source device 100 is configured using, for example, a semiconductor light source element as a light source, and generates a predetermined light source light and supplies it to the LCD. The light source device 100 functions as a backlight light source for the LCD. A typical example of the semiconductor light source element is an LED (Light Emitting Diode) element.

The light source device 100 in one embodiment includes a light source (LED board), a collimator, a light guide, a polarization conversion element, and a diffusion plate, and the polarization conversion element is disposed between the light guide and the diffusion plate (or display panel) (in other words, after the light guide), rather than between the collimator and the light guide (in other words, before the light guide). Note that the light source device 100 may have other configurations.

The light source device 100 converts the randomly polarized light from the light guide into linearly polarized light by using a polarization conversion element downstream of the light guide. Therefore, even if residual stress is present in the light guide, the effects of that residual stress, i.e., changes in the polarization state, are dealt with by conversion to linear polarization in the polarization conversion element. The light incident on the LCD panel 64 is light from which the effects of the residual stress, i.e., changes in the polarization state, have been eliminated. In other words, the light source device 100 can eliminate the effects of residual stress in the light guide on polarization.

In particular, the polarization conversion element may be placed near the LCD panel 64 (at a position closer to the LCD panel 64 than the light guide). A diffuser plate or the like may be placed between the polarization conversion element and the LCD panel 64. A thin lens or Fresnel lens may be placed between the polarization conversion element and the LCD panel 64 as an optical element. The function of this optical element (thin lens or Fresnel lens) is to control the light distribution (control the angle and area of incidence of light) to the lens 63 (Figure 4, etc.) subsequent to the LCD panel 64. This optical element may be placed either in front of or behind the diffuser plate. This optical element and the diffuser plate may be an integrated component.

The lens 63 is a correction lens, and by adjusting the direction of light emitted to the reflecting mirror M1 (described later), the lens 63 corrects distortion in accordance with the shape of the reflecting mirror M1. In this way, an optical element that is optimally designed to improve aberration correction capability may be provided between the reflecting mirror M1 and the image display device 35.

The image display unit 12 also has a mirror M1 and a drive mechanism 62 that drives the mirror M1. The mirror M1 is, for example, a concave mirror (magnifying mirror) and is arranged at a later stage on the optical path. The mirror M1 functions as an image light projection unit that projects the image light emitted from the image display device 35 onto the display area 5, thereby allowing a user such as a driver to view the projected image light as a virtual image. The image light (in other words, the projection light) emitted from the image display device 35 is reflected by the mirror M1 and heads toward the display area 5 of the windshield 3. Therefore, a user of the head-up display device (or virtual image display device) can view the image light as a virtual image.

This allows the driver to view the image projected onto the display area 5 as a virtual image 9 beyond the transparent windshield 3, superimposed on the scenery outside the vehicle (e.g. roads, buildings, people, etc.). There are various types of virtual images that are projected images, such as road signs, the vehicle's current speed, and various types of information added to objects in the scenery. This allows for the realization of an augmented reality (AR) function that adds and displays various types of information to objects in the scenery.

In addition, a drive mechanism 62 is attached to the mirror M1, and the angle of the mirror M1 can be adjusted by the drive mechanism 62. By adjusting the installation angle of the mirror M1 with the drive mechanism 62, the positions of the display area 5 and the virtual image on the windshield 3 can be adjusted. The drive mechanism 62 is a mechanism including a stepping motor, etc. The drive mechanism 62 changes the installation angle of the mirror M1 based on control from the control device. The installation angle of the mirror M1 may also be changed based on manual operation by the user. This makes it possible to adjust the position of the virtual image viewed by the driver 6 in the display area 5, for example, in the vertical direction.

In addition, for example, the area of the display area 5 can be adjusted by changing the area of the mirror M1, making it possible to project an appropriate amount of information onto the display area 5.

Although not shown in FIG. 2, the image display device 35 and the drive mechanism 62 in the image display unit 12 are connected by wire or wirelessly.

[HUD device control system]
The control device 10 corresponds to a controller that controls the entire HUD device 1 and each part thereof, and mainly controls the display of a projected image (virtual image) in the HUD device 1 and the audio output. The control device 10 is configured, for example, with a wiring board. This wiring board is mounted, for example, inside a housing. The control device 10 includes a vehicle information acquisition unit 15, a microcontroller (MCU) 16, a non-volatile memory 17, a volatile memory 18, an audio driver 19, a display driver 20, a communication unit 21, and the like, which are mounted on the wiring board.

As is widely known, the MCU 16 includes a processor such as a CPU (Central Processing Unit), memory, and various peripheral functions. Therefore, each block in the control device 10, except for the MCU 16, may be mounted in the MCU 16 as appropriate. Furthermore, the control device 10 is not limited to being implemented using the MCU 16, and may also be implemented using an ECU or other semiconductor devices.

The vehicle information acquisition unit 15 acquires the vehicle information 4 based on a communication protocol corresponding to, for example, a CAN (Controller Area Network) interface or a LIN (Local Interconnect Network) interface.

As shown in FIG. 3, the vehicle information 4 is generated by information acquisition devices such as various sensors connected to the vehicle information acquisition unit 15. FIG. 3 shows an example of various information acquisition devices. Note that the various information acquisition devices in FIG. 3 can be deleted, other types of devices can be added, or other types of devices can be replaced as appropriate.

For example, the vehicle speed sensor 41 detects the speed of the vehicle 2 in FIG. 1 and generates speed information as the detection result. The shift position sensor 42 detects the current gear and generates gear information as the detection result. The steering wheel steering angle sensor 43 detects the current steering wheel steering angle and generates steering wheel steering angle information as the detection result. The headlight sensor 44 detects whether the headlights are on or off and generates lamp illumination information as the detection result.

The illuminance sensor 45 and chromaticity sensor 46 detect external light and generate external light information that is the detection result. The distance measurement sensor 47 detects the distance between the vehicle 2 and an external object and generates distance information that is the detection result. The infrared sensor 48 detects the presence or absence of an object in close range of the vehicle 2 and the distance, and generates infrared information that is the detection result. The engine start sensor 49 detects whether the engine is ON/OFF and generates ON/OFF information that is the detection result.

The acceleration sensor 50 and gyro sensor 51 detect the acceleration and angular velocity of the vehicle 2, and generate acceleration gyro information representing the attitude and behavior of the vehicle 2 as the detection result. The temperature sensor 52 detects the temperature inside and outside the vehicle, and generates temperature information as the detection result. For example, the temperature sensor 52 can detect the ambient temperature of the HUD device 1. A separate temperature sensor may be installed inside the HUD device 1.

The road-to-vehicle communication wireless transceiver 53 generates road-to-vehicle communication information by road-to-vehicle communication between the vehicle 2 and roads, signs, traffic lights, etc. The vehicle-to-vehicle communication wireless transceiver 54 generates vehicle-to-vehicle communication information by vehicle-to-vehicle communication between the vehicle 2 and other vehicles in the vicinity. The interior camera 55 and the exterior camera 56 capture images of the interior and exterior of the vehicle to generate interior camera image information and exterior camera image information. Specifically, the interior camera 55 is, for example, a camera for a DMS (Driver Monitoring System) that captures the driver 6's posture, eye position, movements, etc. In this case, the captured image can be analyzed to ascertain the driver 6's fatigue state, line of sight, etc.

On the other hand, the exterior camera 56 captures the surrounding conditions, for example, in front of and behind the vehicle 2. In this case, by analyzing the captured image, it becomes possible to ascertain the presence or absence of obstacles such as other vehicles or people in the vicinity, buildings, terrain, road conditions such as rain, snow, ice, unevenness, and road signs. The exterior camera 56 also includes, for example, a drive recorder that records the conditions while driving.

The GPS receiver 57 generates GPS information by receiving GPS signals from GPS satellites. For example, the current time, latitude, and longitude can be obtained by the GPS receiver 57. The VICS (Vehicle Information and Communication System, registered trademark) receiver 58 generates VICS information by receiving VICS signals. The GPS receiver 57 and the VICS receiver 58 may be provided as part of a navigation system.

In FIG. 2, the MCU 16 receives such vehicle information 4 via the vehicle information acquisition unit 15. Based on the vehicle information 4, the MCU 16 generates audio data for the speaker 11, video data for the video display device 35, and the like. The MCU 16 includes an audio data generation unit 27, a video data generation unit 28, a distortion correction unit 29, a light source adjustment unit 30, a mirror adjustment unit 31, and a protection processing unit 75. Each of these units is mainly realized by the CPU of the MCU 16 reading and executing a program stored in the non-volatile memory 17 or the volatile memory 18. The protection processing unit 75 may perform processing using a timer 76.

The voice data generating unit 27 generates voice data based on the vehicle information 4 etc. as necessary. The voice data is generated, for example, when providing voice guidance for the navigation system or when issuing a warning to the driver 6 using the AR function. The voice driver 19 drives the speaker 11 based on the voice data, causing the speaker 11 to output voice.

The video data generation unit 28 generates video data that determines the display content of the projection image to be projected onto the display area 5 of FIG. 1, etc., based on the vehicle information 4, etc. The distortion correction unit 29 generates corrected video data by applying distortion correction to the video data from the video data generation unit 28. Specifically, the distortion correction unit 29 corrects the distortion of the image caused by the curvature of the windshield 3 when the image from the video display device 35 is projected onto the display area 5, as shown in FIG. 1.

The display driver 20 drives each display element (pixel) included in the display panel 64 in the image display device 35 based on the corrected image data from the distortion correction unit 29. In this way, the image display device 35 creates and displays an image to be projected onto the display area 5 based on the corrected image data.

The light source adjustment unit 30 controls the brightness of the light source in the image display device 35. When it is necessary to adjust the position of the display area 5 on the windshield 3, the mirror adjustment unit 31 changes the installation angle of the reflecting mirror M1 by driving the drive mechanism 62 in the image display unit 12 in FIG. 2.

The non-volatile memory 17 mainly stores in advance the programs executed by the CPU in the MCU 16, the setting parameters used in the processing of each part in the MCU 16, and specified audio and video data.

The volatile memory 18 mainly stores the acquired vehicle information 4 and various data used in the processing of each part in the MCU 16 as appropriate. The communication unit 21 is a device equipped with a communication interface, and communicates with the outside of the HUD device 1 based on a communication protocol such as CAN or LIN. The communication unit 21 may be integrated with the vehicle information acquisition unit 15. Each part in the control device 10 in FIG. 5 may be implemented as appropriate by a dedicated circuit such as an FPGA (Field Programmable Gate Array).

Next, the structure and multiple layouts of the HUD device of the present invention will be described. Note that similar content to that described above may be omitted. The HUD device or virtual image display device of the present invention includes an image light output device and an image light projection unit. The image light output device is disposed in front of the driver of the vehicle in the longitudinal direction of the vehicle, and disposed above the driver in the vertical direction of the vehicle. The area above the driver is above the driver's line of sight, and should not obstruct the line of sight. The image light projection unit projects/reflects the image light from the image light output device toward the windshield of the vehicle. The image light projection unit is disposed below the image light output device in the vertical direction of the vehicle. In addition, the direction of the image light incident on the image light projection unit is from top to bottom in the vertical direction of the vehicle, but the direction of the image light emitted by the image light output device is not limited to downward, and in cases other than downward, a light direction conversion unit, such as a lens, that converts the optical path direction of the image light from the image light output device to downward may be disposed.

First Embodiment
The structure and layout of the HUD device in the first embodiment will be described. As shown in Fig. 4, in the first embodiment, the image display device 35 is configured as an image display device 35a capable of emitting image light 80 downward in the vertical direction of the vehicle or the up-down direction of the vehicle, and the image display device 35a is disposed on a roof 82 located in front of the user's viewpoint position 6 in the front-rear direction of the vehicle or the traveling direction of the vehicle, which is a horizontal direction perpendicular to the lateral direction of the vehicle. In other words, the image display device 35a is disposed such that the emission side of the image light 80 faces downward in the up-down direction of the vehicle, and is stored in the roof 82 in front of the user in the traveling direction of the vehicle.

To explain in detail, in the vertical direction or the up-down direction of the vehicle, the image display device 35a is configured to arrange the display panel 64 below the light source device 100 or in the light emission direction, and a lens 63 and a dust cover 86 that is translucent and prevents dust from entering from the outside are provided below the display panel 64. The vehicle 2 also has a storage section inside the roof 82 that stores the image display device 35a. The storage section is configured so that the emitted image light 80 can pass downward. The storage section may be configured, for example, so that an opening through which the image light 80 passes is formed at a position below the image display device 35a. The storage section may be formed, for example, with a portion facing the image light emission side of the image display device 35a made of a translucent material so as to transmit the image light 80 from the image display device 35a, or only the opening of the storage section may be formed of a translucent material. Meanwhile, in this embodiment, the image display device 35a is stored in the storage section, but the image display device 35a may be arranged on the roof 82 without being stored in the storage section.

In this embodiment, the mirror M1 is a reflective mirror M1. The reflective mirror M1 is a concave mirror and is disposed on the dashboard 81 of the vehicle 2. A storage section is formed to store the reflective mirror M1, and the surface of the storage section corresponding to the reflective surface of the reflective mirror M1 is a dust cover 87 that is translucent and prevents dust from entering from the outside. Therefore, the reflective mirror M1 reflects the image light 80 that enters from above through the dust cover 87 toward the windshield 3 via the dust cover 87.

The reflecting mirror M1 may be disposed in a position close to the dashboard 81, or a gap may be formed between the reflecting mirror M1 and the dashboard 81. The reflecting mirror M1 may be stored within the dashboard 81, or may be disposed so as to be flush with the upper surface of the dashboard 81. The storage section for the reflecting mirror M1 may be omitted.

The orientation of the reflective mirror M1 can be adjusted by the drive device 62, and the position of the virtual image display 9 can be adjusted by changing the orientation of the reflective mirror M1. The control device 10 may, for example, use the drive mechanism 62 to perform control to suppress positional deviation of the virtual image display 9 that occurs when the vehicle 2 is being driven. Note that when the reflective mirror M1 is placed on the dashboard 81, the storage section for the reflective mirror M1 may be omitted, and the orientation of the reflective mirror M1 may be manually changeable.

Next, the layout will be described from the viewpoint of the optical path of the image light. The vehicle 2 is provided with a movable member 83, such as a sun visor or a rearview mirror that is movable near the roof 82, in front of the driver or on the upper part of the windshield, and it is considered that the image light 80 is blocked by the movement of the movable member 83. In addition, if the driver's visibility range in the vertical direction of the vehicle (or the up-down direction of the vehicle) overlaps with the movable range of the movable member 83 in the front-rear direction of the vehicle (or the traveling direction of the vehicle), it is considered that the driver will not be able to see the virtual image display 9. Therefore, in this embodiment, the image display device 35a and the reflecting mirror M1 are arranged so that the optical path of the image light that causes the image light 80 emitted from the image display device 35a to enter the reflecting mirror M1 and the line of sight of the user viewing the virtual image display 9 based on the image light 80 do not overlap with the movable range 84 of the movable member 83 when performing the virtual image display 9.

The movable range 84 can be considered as a three-dimensional range, not just a range in the front-to-rear direction of the vehicle. Also, by adjusting the angle of the reflecting mirror M1 in the vertical direction of the vehicle, it may be possible to adjust the range within which the image light reflected from the reflecting mirror M1 to the windshield 3 does not overlap with the movable range 84 of the movable member 83. Alternatively, the image display device 35a and the reflecting mirror M1 are positioned so that the optical path of the image light emitted from the image display device 35a, the optical path of the image light reflected by the reflecting mirror M1, or the projection range in which the image light reflected by the reflecting mirror M1 is projected onto the windshield 3, and the user's line of sight do not overlap with the movable range 84 of the movable member 83.

According to this embodiment, even if, for example, frames, pipes, instruments and their holders are mounted inside the dashboard 81, narrowing the space 85 above the inside of the dashboard 81 and making it impossible to secure space to mount the image display device inside the dashboard 81, a layout is realized that allows the image display device 35a to be mounted. The image display device 35a is disposed inside the roof 82 in front of the driver in the vertical direction of the vehicle. Furthermore, when the image display device 35a is stored in a storage section inside the roof 82, the storage section may have a structure that has space above and in front of the driver to accommodate the image display device 35a, and in the case of a vehicle such as a truck, it may be a storage shed or a bed. Furthermore, in this embodiment, the reflecting mirror M1 is a concave mirror from the viewpoint of improving performance such as aberration, but it may be changed to a flat mirror.

Second Embodiment
Next, the structure and layout of the HUD device in the second embodiment will be described. Note that the same contents as those described above may be omitted.

As shown in FIG. 5, in the second embodiment, the image display device 35 is configured as an image display device 35b in which the image light from the light source device 100 is emitted backward in the traveling direction of the vehicle and enters the display panel 64, and the image light 80 output by the display panel 64 can be emitted downward. This image display device 35b has a light direction conversion unit that emits or reflects the image light 80 emitted from the display panel 64 downward. The light direction conversion unit in this embodiment is a guide mirror 88. A lens 63 may also be provided, and a dust cover 86 that is translucent and prevents dust from entering from the outside may be provided at the emission part of the image light 80. In this embodiment, the rear, which is the emission direction of the image light from the light source device 100, is the reverse direction of the traveling direction, that is, the backing direction, but may be shifted upward or downward from the backing direction. In this case, the arrangement of the guide mirror 88 may be adjusted. The guide mirror 88 is a concave mirror, but may be changed to a flat mirror. Additionally, the reflecting mirror M1 is a flat mirror, but it may be changed to a concave mirror.

According to the second embodiment, the angle of the image light emitted by the rear guide mirror 88 with respect to the light source device 100 can be easily set in the traveling direction of the vehicle. As a result, for example, it becomes easy to realize a layout in which the optical path of the image light is separated from the movable range 84 of the movable member 83 to the rear or to the windshield.

Next, an example in which image display device 35c is disposed in place of image display device 35b will be described. As shown in FIG. 6, in the traveling direction of the vehicle, image display device 35c is configured to emit downward image light 80 outputted forward from light source device 100, and includes a guide mirror 88 (light direction conversion unit) that reflects downward image light 80 incident from display panel 64. A lens 63 may also be provided, and a dust cover 86 may be provided at the emission unit of image light 80. Note that guide mirror 88 is a concave mirror, but may be changed to a flat mirror. Reflection mirror M1 is a flat mirror, but may be changed to a concave mirror.

This configuration makes it easy to set the angle of the image light emitted by the forward guide mirror 88 relative to the light source device 100 in the direction of travel of the vehicle. As a result, it becomes easier to realize a layout in which the reflecting mirror M1 is positioned further forward, for example, so that the reflecting mirror M1 is located away from the driver.

<Modification 1>
Next, a first modified example will be described with reference to Figures 7 to 9. Note that the same contents as those described above may be omitted.

As shown in FIG. 7, the image light projection unit is a concave reflective mirror M1, which is disposed in a space 85 inside the dashboard 81. This allows a layout in which the reflective mirror M1 is disposed inside the dashboard 81. Here, the dust cover 87 may be provided so as to be flush with the upper surface of the dashboard 81, for example, or may be disposed below the upper surface of the dashboard 81 in the vertical direction of the vehicle. Then, the image light 80 enters the inside of the dashboard 81 through the dust cover 87, and the image light 80 reflected by the reflective mirror M1 travels toward the windshield 3 through the dust cover 87.

As shown in FIG. 8, the image light projection unit is a flat reflective mirror M1, which is disposed in a space 85 above the inside of the dashboard 81. This allows a layout in which the reflective mirror M1 is disposed within the dashboard 81. Here, the dust cover 87 may be provided so as to be flush with the upper surface of the dashboard 81, for example, or may be disposed below the upper surface of the dashboard 81 in the vertical direction of the vehicle. Then, the image light 80 enters the inside of the dashboard 81 via the dust cover 87, and the image light 80 reflected by the reflective mirror M1 travels toward the windshield 3 via the dust cover 87.

As shown in FIG. 9, image display device 35c is accommodated in a storage section on the inside of roof 82 so that image light 80 is incident on reflection mirror M1 inside dashboard 81. Note that in this example, image display device 35c is used, but image display device 35a or image display device 35b may also be used. Note that the position of reflection mirror M1 may be determined taking into consideration the position and size of space 85 inside dashboard 81. Also, which image display device (35a to 35c) to use may be determined taking into consideration the position of reflection mirror M1 inside dashboard 81.

In accordance with variant 1, by placing the reflecting mirror 1 inside the dashboard 81, a more compact (cleaner) layout can be achieved.

<Modification 2>
Next, a second modified example will be described with reference to Figures 10 to 13. Note that the same content as that described above may be omitted.

In the second modification, an example where measures against sunlight are taken will be described. In the example of FIG. 10, a flat reflecting mirror M11 that transmits P-polarized light and reflects S-polarized light is used instead of the reflecting mirror M1. In this example, image light 80a including S-polarized light is incident on the reflecting mirror M11, and a virtual image is displayed based on the reflected S-polarized image light 80a. Of the sunlight 90 incident on the reflecting mirror M11, P-polarized sunlight 90a is transmitted, and only S-polarized sunlight 90b is reflected. In this way, by reducing the amount of sunlight reflected upward by the reflecting mirror M11, it is possible to suppress deterioration of the lens 63 and the image display element (or display panel) due to sunlight. Furthermore, the reduction in the amount of reflected sunlight suppresses a decrease in the driver's visibility of the virtual image display.

In this example, the reflecting mirror M11 is configured to reflect S-polarized light and transmit P-polarized light, but it may be configured to reflect P-polarized light and transmit S-polarized light. In this case, a virtual image is displayed using P-polarized image light. As in the embodiment, the reflecting mirror M11 can be appropriately positioned close to the dashboard 81, on the dashboard 81, or inside the dashboard 81. The reflecting mirror M11 may also be positioned so that it is flush with the upper surface of the dashboard 81. The reflecting mirror M11 may also have a curved shape instead of a flat shape. The display panel 64 may be configured to output either S-polarized or P-polarized image light.

In the example of FIG. 11, instead of the reflecting mirror M1, a reflecting mirror M12 configured as a flat cold mirror that transmits infrared light and reflects visible light is used. In this example, the image display device emits image light 80, and a virtual image is displayed based on the reflected image light 80. Furthermore, of the sunlight 90 that is incident on the reflecting mirror M12, infrared light 90c contained in the sunlight 90 is transmitted, and only visible light 90d contained in the sunlight 90 is reflected. In this way, by preventing infrared light from being reflected upward by the reflecting mirror M12, it is possible to prevent deterioration of the lens 63 and the image display element due to the infrared light contained in the sunlight.

As in the embodiment, the reflecting mirror M12 can be appropriately positioned in a position close to the dashboard 81, on the dashboard 81, or inside the dashboard 81. The reflecting mirror M12 may also be positioned so that it is flush with the upper surface of the dashboard 81. The reflecting mirror M12 may also have a curved shape instead of a flat shape.

As shown in the example of FIG. 12, instead of the reflecting mirror M1, a curved reflecting mirror M13 that transmits P-polarized light and reflects S-polarized light, and transmits infrared light and reflects visible light, may be used. The reflecting mirror M13 can be constructed, for example, by forming an optical thin film that transmits infrared light and reflects visible light on the reflecting surface of the mirror that polarizes light or on the surface opposite the reflecting surface.

In this example, image light 80a containing S-polarized light is incident on the reflecting mirror M13, and a virtual image is displayed based on the reflected S-polarized image light 80a. Furthermore, of the sunlight 90 incident on the reflecting mirror M13, sunlight 90d containing P-polarized visible light and infrared light is transmitted, and S-polarized visible light 90e is reflected. According to this example, the amount of infrared light reflected upward can be reduced, and deterioration of the lens 63 and image display element caused by the infrared light contained in the sunlight can be suppressed.

In this example, the reflecting mirror M13 is configured to reflect S-polarized light and transmit P-polarized light, but it may be configured to reflect P-polarized light and transmit S-polarized light. In this case, a virtual image is displayed using P-polarized image light, and S-polarized infrared light is transmitted. As in the embodiment, the reflecting mirror M13 can be appropriately positioned close to the dashboard 81 or on the dashboard 81. The reflecting mirror M13 may also be positioned so that it is flush with the top surface of the dashboard 81. The reflecting mirror M13 may also be flat instead of curved. The display panel 64 may be configured to output either S-polarized or P-polarized image light.

As shown in the example of FIG. 13, a flat reflecting mirror M14 that transmits P-polarized light and reflects S-polarized light, and transmits infrared light and reflects visible light, may be used instead of the reflecting mirror M1. The reflecting mirror M14 can be constructed, for example, by forming an optical thin film that transmits infrared light and reflects visible light on the reflecting surface of the reflecting mirror M11 or on the surface opposite to the reflecting surface. The reflecting mirror M14 is disposed inside the dashboard 81.

In this example, image light 80a containing S-polarized light is incident on the reflecting mirror M14, and a virtual image is displayed based on the reflected S-polarized image light 80a. Furthermore, of the sunlight 90 incident on the reflecting mirror M14, sunlight 90d containing P-polarized visible light and infrared light is transmitted, and S-polarized visible light 90e is reflected. According to this example, the amount of infrared light reflected upward can be reduced, and deterioration of the lens 63 and the image display element (display panel) caused by the infrared light contained in the sunlight can be suppressed.

In this example, the reflecting mirror M14 is configured to reflect S-polarized light and transmit P-polarized light, but it may be configured to reflect P-polarized light and transmit S-polarized light. In this case, a virtual image is displayed using P-polarized image light, and S-polarized infrared light is transmitted. The reflecting mirror M14 may be appropriately positioned close to the dashboard 81 or on the dashboard 81. The reflecting mirror M14 may also be positioned so that it is flush with the upper surface of the dashboard 81. The reflecting mirror M13 may also be curved instead of flat. The display panel 64 may be configured to output either S-polarized or P-polarized image light.

<Modification 3>
Next, a third modification will be described with reference to Figures 14 to 20. Note that the same contents as those described above may be omitted.

In the third modification, an example of displaying multiple virtual images will be described. First, an example of the third modification will be described with reference to Figs. 14 to 16. As shown in Fig. 14, the image display device 35 is configured as an image display device 35d that can separate S-polarized light and P-polarized light and emit the image light downward. Also, instead of the reflecting mirror M1, an image light projection unit 110 is arranged on the dashboard 81. This image light projection unit 110 includes a reflecting mirror or a first mirror that reflects S-polarized image light and a reflecting mirror or a second mirror that reflects P-polarized image light, and these reflecting mirrors are arranged at intervals in the vertical direction. Also, the image light projection unit 110 may be referred to as an image light reflection unit. To protect against sunlight, the image light projection unit 110 may be a mirror that reflects visible light and transmits infrared light.

The S-polarized and P-polarized image lights emitted from the image display device 35d are each reflected by a different reflecting mirror. The S-polarized and P-polarized image lights are then projected onto different positions on the windshield 3. The driver can simultaneously view multiple virtual image displays (9a, 9b) with different display positions and display distances. Meanwhile, by controlling the display on the display panel of the image display device 35d, one of the virtual images 9a and 9b can be displayed. Also, instead of controlling the display panel, it is possible to adjust the display of the virtual images by arranging two light sources and controlling the ON/OFF of the light sources.

The image light projection unit or image light reflection unit 110 shown in FIG. 14 is disposed on the dashboard 81. However, taking into consideration the space within the dashboard 81, a part or all of the image light projection unit 110 (i.e., at least a part of the image light projection unit 110) may be located within the dashboard 81. Alternatively, one or both of the first mirror and the second mirror may be stored within the dashboard 81. Also, one or both of the first mirror and the second mirror may be disposed so as to be flush with the upper surface of the dashboard 81. In the image light projection unit 110, the distance between the first mirror and the second mirror can be appropriately adjusted, so that virtual images can be displayed at different positions and distances. The distance between the first mirror and the second mirror can be adjusted in any of the vertical direction of the vehicle, the front-rear direction of the vehicle, and the width direction of the vehicle, and the light path can be shortened by adjusting the height so that the image light reflection point on the mirror is closer to the windshield 3.

FIG. 15 is an enlarged view of the image display device 35d. Next, the details of the image display device 35d will be described with reference to FIG. 15. As shown in FIG. 15, the image display device 35d includes a λ/2 retarder 101 that converts S-polarized light and P-polarized light on the output side of the image light of the display panel 64. Specifically, in this example, the λ/2 retarder 101 is provided on the front side of the output side of the image light of the display panel 64 in the vehicle travel direction, but may be provided on the rear side. In other words, a retarder may be provided on the output side of the display panel of the image display device 35d corresponding to the optical path of the image light incident on the first mirror M21, or a retarder may be provided on the output side of the display panel of the image display device 35d corresponding to the optical path of the image light incident on the second mirror M22. Note that it is only necessary to output S-polarized and P-polarized image light and display two virtual images based on these image lights, and the length of the λ/2 retarder 101 can be set appropriately. The λ/2 retardation plate 101 may be configured to have a length extending from the edge of the display panel 64 to near the center.

Next, the image light projection unit 110 will be described in detail with reference to FIG. 16. As shown in FIG. 16, in the vertical direction of the vehicle, the image light projection unit 110 includes a reflecting mirror (or a first mirror) M21 that transmits P-polarized light and reflects S-polarized light, and a reflecting mirror M22 (or a second mirror) that is located below the reflecting mirror M21 and transmits S-polarized light and reflects P-polarized light. The reflecting mirror M21 reflects the S-polarized image light 80a toward the windshield 3. This allows a virtual image display 9a based on the image light 80a to be performed. The reflecting mirror M22 reflects the P-polarized image light 80b that has transmitted through the reflecting mirror M21 toward the windshield 3. This allows a virtual image display 9b based on the image light 80b to be performed.

The reflecting mirror M21 and the reflecting mirror M22 may be flat or curved. The driving mechanism 62 may be configured to change the orientation/angle of each reflecting mirror (M21, M22) in conjunction with each other. The driving mechanism 62 may be configured to change the orientation/angle of each reflecting mirror (M21, M22) independently, and the control device 10 may change the orientation/angle of a selected reflecting mirror. If two virtual image displays (9a, 9b) can be displayed, the positions of the reflecting mirror M21 and the reflecting mirror M22 may be swapped.

Next, another example of Modification 3 will be described with reference to Figures 17 and 18. As shown in Figure 17, the image display device 35 is configured as an image display device 35e that can separate S-polarized light and P-polarized light and emit the image light downward. Also, instead of the reflecting mirror M1, an image light projection unit 110 is configured. The image light projection unit 110 is arranged on the dashboard 81, but taking into account the space inside the dashboard 81, part or all of the image light projection unit 110 may be arranged inside the dashboard 81. Also, one of the reflecting mirrors may be arranged so that it is flush with the top surface of the dashboard 81. Note that this image light projection unit 110 is similar to the configuration described above with reference to Figure 16, and a detailed description thereof will be omitted.

The S-polarized and P-polarized image lights emitted from the image display device 35e are reflected by different reflecting mirrors, or by the first and second mirrors. The S-polarized and P-polarized image lights are then projected onto different positions on the windshield 3. The driver can then simultaneously view multiple virtual image displays (9a, 9b) with different display positions and display distances.

Next, the details of the image display device 35e will be described with reference to FIG. 18. As shown in FIG. 18, the image display device 35e is configured to be able to emit the image light output by the display panel 64 downward toward the rear in the traveling direction of the vehicle. This image display device 35e includes a guide mirror 88 that reflects the image light emitted from the display panel 64 downward. Note that the guide mirror 88 has a curved shape, but may also have a planar shape. Also, a λ/2 retarder 101 that converts S-polarized light and P-polarized light is disposed on the image light emission side of the display panel 64. Note that in this example, the λ/2 retarder 101 is disposed on the upper side of the image light emission side of the display panel 64 in the vertical direction of the vehicle, but may also be disposed on the lower side. Alternatively, a retarder may be disposed on the emission side of the display panel of the image display device 35e that corresponds to the optical path of the image light incident on the first mirror M21 or the first mirror M22.

The S-polarized and P-polarized image light output from the display panel 64 enter the guide mirror 88 and are reflected downward. The length of the λ/2 retarder 101 can be set appropriately as long as it is possible to emit S-polarized and P-polarized image light and display two virtual images based on this image light. The λ/2 retarder 101 may be configured to have a length extending from the edge of the display panel 64 to near the center, for example. Furthermore, if two virtual image displays (9a, 9b) can be displayed, the positions of the reflecting mirror M21 and the reflecting mirror M22 may be swapped.

Next, another example of Modification 3 will be described with reference to Figures 19 and 20. As shown in Figure 19, the image display device 35 is configured as an image display device 35f that can separate S-polarized light and P-polarized light and emit the image light downward. Also, instead of the reflecting mirror M1, an image light projection unit 110 is configured. The image light projection unit 110 is arranged on the dashboard 81, but taking into account the space inside the dashboard 81, part or all of the image light projection unit 110 may be located inside the dashboard 81. Also, one of the reflecting mirrors may be arranged so that it is flush with the top surface of the dashboard 81. Note that this image light projection unit 110 is similar to the configuration described above with reference to Figure 16, and a detailed description thereof will be omitted.

The S-polarized and P-polarized image lights emitted from the image display device 35f are each reflected by a different reflecting mirror. The S-polarized and P-polarized image lights are then each projected onto different positions on the windshield 3. The driver can then simultaneously view multiple virtual image displays (9a, 9b) with different display positions and display distances.

Next, the details of the image display device 35f will be described with reference to FIG. 20. As shown in FIG. 20, in the traveling direction of the vehicle, the image display device 35f is configured to be able to emit the image light output by the display panel 64 downward toward the front. This image display device 35f is provided with a guide mirror 88 that reflects the image light emitted from the display panel 64 downward. Note that the guide mirror 88 has a curved shape, but may also have a flat shape. In addition, the image light emission side of the display panel 64 is provided with a λ/2 retarder 101 that converts S-polarized light and P-polarized light. Note that in this example, the λ/2 retarder 101 is provided below the display panel 64 in the vertical direction of the vehicle, but it may also be provided above it.

The S-polarized and P-polarized image light output from the display panel 64 is incident on the guide mirror 88 in the vertical direction of the vehicle and is reflected downward. The length of the λ/2 retarder 101 can be set appropriately as long as it is possible to emit S-polarized and P-polarized image light and display two virtual images based on this image light. The λ/2 retarder 101 may be configured to have a length extending from the edge of the display panel 64 to near the center, for example. Furthermore, if two virtual image displays (9a, 9b) can be displayed, the positions of the reflecting mirror M21 and the reflecting mirror M22 may be swapped.

Even in cases where it is not possible to secure space within the dashboard to mount an image display device as in the past, and as a result it is not possible to mount part or all of a head-up display device, the above embodiment and modified examples make it possible to mount a head-up display device.

The present invention is not limited to the above, and includes various modifications. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those having all of the configurations described. For example, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to add, delete, or replace part of the configuration of each embodiment and modified example with other configurations.

The head-up display device of the present invention can effectively project image light onto a windshield 3 that is arranged to rise up, as shown in FIG. 4. However, the angle of the windshield 3 may be changed within a range that allows for appropriate virtual image display.

The dust covers (86, 87) are made of, for example, a transparent material that transmits light, and may be curved or flat. In addition, the dust covers (86, 87) may be treated with an anti-reflection coating or other anti-reflection coating to prevent reflections on the windshield 3 caused by ambient light and reflective mirrors.

The lens 63 may have a curved shape, for example. In addition to the lens 63, a new lens for controlling light distribution may be disposed between the display panel 64 and the dust cover 86. The head-up display device may be configured such that the lens 63 and this new lens are omitted.

Projection may be performed using a liquid crystal method, a liquid crystal on silicon (LCOS) method, a digital lighting processing (DLP) method, or the like. The display panel 64 may be configured to have an image display element according to the projection method. The light source device 100 only needs to function as a backlight source, and the configuration may be changed as appropriate. In the DLP method, for example, a screen may be provided in addition to a digital mirror device.

Vehicles include, for example, automobiles (four-wheeled automobiles, trucks, buses, etc.), trains, etc. Note that while a vehicle has been described as an example of a vehicle, a vehicle equipped with a head-up display device is not limited to a vehicle and may be, for example, an aircraft (passenger plane, etc.).

The head-up display device may be configured such that the image display device is disposed in a storage unit formed in front of and above the driver inside a train or airplane, and the reflecting mirror or image light projection unit is disposed on the upper side of the dashboard of the train or airplane. Also, taking into consideration the space inside the dashboard, the reflecting mirror or part or all of the image light projection unit may be disposed inside the dashboard.

The vehicle may be equipped with an internal combustion engine as a prime mover, or it may be equipped with a motor as a prime mover.

In variant 3, the control device 10 may control the image display devices (35d-35f) to emit S-polarized and P-polarized image light (80a, 80b), each of which displays different information (or the same information).

In the third modification, the length of the λ/2 retardation plate 101, etc. may be adjusted to adjust the size of each virtual image display (9a, 9b).

Furthermore, by using the method of the embodiment, the user can view various information necessary for driving, such as navigation information such as destination and speed, as an image through the windshield, such as alert information when an oncoming vehicle or pedestrian is detected. This makes it possible to provide a head-up display device (virtual image display device) that contributes to supporting safe driving, which in turn makes it possible to prevent traffic accidents. Furthermore, it becomes possible to contribute to "3. Good health and well-being for all" of the Sustainable Development Goals (SDGs) advocated by the United Nations.

1. HUD device (virtual image display device)
12 Image display unit 35 Image display device (image light output device)
110 Image light projection unit M1 Reflection mirror (image light projection unit)

Claims

A head-up display device mounted on a vehicle,
an image light output device disposed in front of a driver of the vehicle in a longitudinal direction of the vehicle and above the driver in a vertical direction of the vehicle;
an image light projection unit that projects the image light from the image light output device toward a windshield of the vehicle,
Head-up display device.
The head-up display device according to claim 1,
the image light output device is disposed on a front roof of the vehicle;
Alternatively, the image light output device is housed in a storage unit arranged on the roof at the front of the vehicle.
Head-up display device.
The head-up display device according to claim 1,
In the vertical direction of the vehicle, the image light output side of the image light output device is disposed facing downward.
Head-up display device.
The head-up display device according to claim 1,
The image light projection unit is disposed on or within a dashboard of the vehicle.
Head-up display device.
The head-up display device according to claim 1,
a mirror that causes the image light emitted by the image light output device to be incident on the image light projection unit,
Head-up display device.
The head-up display device according to claim 1,
The image light projection unit includes:
A mirror that reflects visible light and transmits infrared light.
Head-up display device.
The head-up display device according to claim 1,
The image light projection unit includes:
A mirror that reflects S-polarized light and transmits P-polarized light.
Head-up display device.
The head-up display device according to claim 1,
The image light projection unit includes:
A mirror that reflects S-polarized visible light and transmits P-polarized visible light and infrared light.
Head-up display device.
A head-up display device mounted on a vehicle,
an image light output device that is disposed in front of a driver of the vehicle in a longitudinal direction of the vehicle and above the driver in a vertical direction of the vehicle, and that outputs image light including S-polarized light and P-polarized light;
an image light projection unit that projects the image light from the image light output device toward a windshield of the vehicle,
The image light projection unit includes:
a first mirror that reflects S-polarized light and transmits P-polarized light;
a second mirror that reflects P-polarized light and transmits S-polarized light;
the first mirror and the second mirror are disposed at different positions in the vertical direction;
Head-up display device.
The head-up display device according to claim 9,
In the vertical direction of the vehicle, the image light output side of the image light output device is disposed facing downward.
Head-up display device.
The head-up display device according to claim 9,
a light direction conversion unit that causes the image light emitted by the image light output device to be incident toward the image light projection unit,
Head-up display device.
The head-up display device according to claim 9,
a retardation plate is disposed on the exit side of a display panel of the image light output device corresponding to the optical path of the image light incident on the first mirror;
Head-up display device.
The head-up display device according to claim 9,
a retardation plate is disposed on the exit side of a display panel of the image light output device corresponding to the optical path of the image light incident on the second mirror;
Head-up display device.
The head-up display device according to claim 9,
the image light output device is disposed on a front roof of the vehicle;
Alternatively, the image light output device is housed in a storage unit arranged on the roof at the front of the vehicle.
Head-up display device.
The head-up display device according to claim 9,
The image light projection unit includes:
located on a dashboard of the vehicle;
Or, at least a portion of the display is disposed within the dashboard.
Head-up display device.
The head-up display device according to claim 9,
The image light projection unit includes:
a lower one of the first and second mirrors is positioned to be flush with an upper surface of a dashboard of the vehicle;
Head-up display device.
A head-up display device mounted on a vehicle,
an image light output device disposed in front of a driver of the vehicle in a longitudinal direction of the vehicle and above the driver in a vertical direction of the vehicle;
an image light projection unit that projects the image light from the image light output device toward a windshield of the vehicle,
the image light output device and the image light projection unit are arranged so that a path of the image light emitted from the image light output device toward a downward direction and a line of sight of the driver who visually recognizes a virtual image based on the image light reflected toward the windshield do not overlap with a movable range of a movable member installed on an upper portion of the windshield;
Head-up display device.
A vehicle equipped with the head-up display device according to claim 1.
A vehicle equipped with the head-up display device according to claim 9.
A vehicle equipped with the head-up display device according to claim 17.