JP2023181839A - Head-up display device - Google Patents

Abstract

To provide a head-up display device that can reflect video light on a video light reflecting surface standing up on the front of a user to perform satisfactory display, the head-up display device contributing to Goal 3, "Ensure healthy lives and promote well-being for all at all ages" of the Sustainable Development Goals, according to the present invention.SOLUTION: This head-up display device is a head-up display device for a vehicle. This head-up display device comprises a video display device and a video light projection unit. The video display device generates video light and emits it as emission light. The video light projection unit reflects the emission light emitted from the video display device, and projects it toward a display area of the vehicle. This head-up display device is arranged on the front of a driver of the vehicle, and is configured so that the emission light reflected by the video light projection unit is directed toward the front of the vehicle.SELECTED DRAWING: Figure 7

Description

The present invention relates to a head-up display device.

2. Description of the Related Art Head-up display devices (hereinafter sometimes referred to as HUD devices) that display various information have been known. A HUD device displays information to a user by reflecting image light on an image light reflecting surface (for example, a windshield of a vehicle).

JP2022-027798A

However, with the conventional structure, it was considered difficult to provide a good display when the image light reflecting surface was provided standing up in front of the user.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a HUD device that can reflect image light on an image light reflecting surface that stands up in front of a user and provide a good display.

According to the present invention, the following HUD device is provided. This HUD device is a vehicle HUD device. The HUD device includes an image display device and an image light projection section. The image display device generates image light and emits it as emitted light. The image light projection section reflects the emitted light emitted from the image display device and projects it toward the display area of the vehicle. The HUD device is disposed in front of the driver of the vehicle, and is configured such that the emitted light reflected by the image light projection section is directed toward the front of the vehicle.

According to the present invention, there is provided a HUD device that can perform good display by reflecting image light on an image light reflecting surface that stands up in front of a user.

1 is a schematic diagram showing a configuration example of a vehicle equipped with a head-up display device (HUD device). 1 is a schematic diagram illustrating a configuration example of a video display unit and the like constituting a HUD device according to a conventional structure. FIG. 3 is a schematic diagram showing a more detailed configuration example of the video display unit of FIG. 2, which has a conventional structure. 4 is a perspective view showing an example of the appearance of a HUD device having a conventional structure and including the video display unit of FIG. 3. FIG. FIG. 2 is a functional block diagram showing a configuration example of a control system of the HUD device in FIG. 1. FIG. 6 is a functional block diagram showing a configuration example related to the vehicle information acquisition section of FIG. 5. FIG. 1 is a schematic diagram showing a configuration example of a video display unit and the like that constitute a HUD device according to a first embodiment of the present invention; FIG. 8 is a diagram showing an example in which the structure of the HUD device in FIG. 7 is changed. FIG. FIG. 7 is a schematic diagram showing a configuration example of a video display unit and the like constituting a HUD device according to a second embodiment of the present invention. 10 is a diagram showing an example in which the structure of the HUD device in FIG. 9 is changed. FIG.

Embodiments of the present invention will be described in detail below with reference to the drawings. In the drawings, the same parts are generally designated by the same reference numerals, and repeated explanations will be omitted. In the drawings, the representation of each component may not represent its actual position, size, shape, range, etc. in order to facilitate understanding of the invention.

For the purpose of explanation, when explaining processing by a program, the program, function, processing unit, etc. are sometimes explained as the main body, but the main body of hardware for these is the processor or the controller made up of the processor, etc. , equipment, computers, systems, etc. A computer executes processing according to a program read onto a memory, using resources such as a memory and a communication interface as appropriate by a processor. Thereby, predetermined functions, processing units, etc. are realized. The processor is composed of, for example, a semiconductor device such as a CPU or a GPU. A processor is composed of devices and circuits that can perform predetermined operations. The processing is not limited to software program processing, but can also be implemented using a dedicated circuit. As the dedicated circuit, FPGA, ASIC, CPLD, etc. can be applied.

An overview of the HUD device will be explained using FIG. 1. Further, a general HUD structure will be explained using FIGS. 2 to 4. In this example, the HUD device includes a light source device and a display panel.

The light source device 100 shown in FIG. 3 and the like is configured using, for example, a semiconductor light source element as a light source, and generates predetermined light source light and supplies it to the LCD. The light source device 100 functions as a backlight source for an LCD. As the semiconductor light source element, an LED (Light Emitting Diode) element is typically used. The light source device 100 in this 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 located between the collimator and the light guide (in other words, the light guide It is arranged between the light guide and the diffuser plate (or display panel) (in other words, after the light guide). The light source device 100 may have other configurations.

The light source device 100 converts randomly polarized light from the light guide into linearly polarized light using a polarization conversion element located after the light guide. Therefore, even if residual stress is present in the light guide, the influence of the residual stress, that is, a change in the polarization state, can be dealt with by converting the light into linearly polarized light using the polarization conversion element. The light incident on the LCD panel 64 becomes light in which the influence of residual stress, that is, the change in the polarization state has been eliminated. In other words, the light source device 100 can eliminate the influence 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 a 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 incident angle and area of the light beam) to the lens 63 (FIG. 3) after the LCD panel 64. This optical element may be placed either before or after the diffuser plate. A member in which the optical element and the diffuser plate are integrated may be used.

[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. As shown in FIG. The HUD device 1 in FIG. 1 is mounted on a vehicle 2. The vehicle 2 is typically an automobile, but is not necessarily limited to this, and may be a railway vehicle or the like in some cases. In FIG. 1, etc., 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, and the vertical direction is the vertical direction of the vehicle, the longitudinal direction, and the lateral direction of the vehicle. The horizontal direction perpendicular to the vehicle is the longitudinal direction of the vehicle or the direction of travel 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 detect, for example, various events that occur in the vehicle 2, or periodically detect the values of various parameters related to the driving situation. The vehicle information 4 includes, for example, speed information and gear information of the vehicle 2, steering angle information, lamp lighting information, external light information, distance information, infrared information, engine ON/OFF information, camera image information, acceleration gyro information, This includes 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. In addition to latitude and longitude, the GPS information also includes current time information.

Based on such vehicle information 4, the HUD device 1 projects an image onto the display area 5 of the windshield 3 using the image display unit 12 (FIG. 2). Thereby, the HUD device 1 allows the driver (driver's viewpoint) 6 of the vehicle 2 to view the scenery on which the projected image is superimposed as the corresponding virtual image 9 . The windshield 3 or windshield of the present invention is referred to as an image light reflecting surface.

FIG. 2 is a schematic diagram showing a configuration example of a part of the vehicle 2 in FIG. 1, the video display unit 12, etc. that constitute the HUD device 1. The video display unit 12 is housed in the housing of the HUD device 1. The video display unit 12 in FIG. 2 includes a video display device 35, a mirror M1, and a mirror M2. Mirror M1 is a first mirror placed at the rear stage on the optical path. The mirror M1 is, for example, a concave mirror (magnifying mirror), and is provided on the optical path of the image light between the mirror M2 and the display area 5. 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 making the projected image light visible as a virtual image to a user such as the driver 6. Mirror M2 is a second mirror placed at the front stage on the optical path. Mirror M2 is, for example, a plane mirror, and is provided on the optical path of image light between image display device 35 and mirror M1. Mirror M2 functions as an image light reflecting section that reflects image light from image display device 35 onto mirror M1. Furthermore, when the optical path of the image light is shortened, only the mirror M1 may be disposed, that is, the mirror M2 may not be disposed. Furthermore, no deflection filter is disposed between the display area 5 and the image display device 35 on the optical path of the image light according to the present invention. The image light (in other words, the projection light) emitted from the image display device 35 is reflected through the mirror M2 or the reflecting mirror M2 and the mirror M1 or the reflecting mirror M1, and is emitted from the opening 71 (FIG. 3) of the housing. . The image light emitted from the image display unit 12 passes through the opening 7 of the dashboard of the vehicle 2 and heads toward the display area 5 of the windshield 3. The image light is reflected by the display area 5 of the windshield 3 and heads toward the viewpoint 6. The driver can visually recognize the image light as a virtual image 9 from the viewpoint 6.

[Video display unit]
FIG. 3 shows a more detailed configuration example of the video display unit 12 in FIG. 2. The video display unit 12 in FIG. 3 includes a video display device 35, a lens 63, a reflective mirror M2, and a reflective mirror M1. Further, the angle of the reflection mirror M1 can be adjusted by the drive mechanism 62. The image display device 35, the lens 63, the reflective mirror M2, and the reflective mirror M1 with the drive mechanism 62 shown in FIG. 3 are housed in the housing 61. The housing 61 is provided with an opening 71 . In the configuration example shown in FIG. 3, an optical system for projecting image light onto the display area 5 includes a lens 63, a reflective mirror M2, and a reflective mirror M1. Further, the lens 63 is a correction lens, and by adjusting the exit direction of the light beam to the reflection mirror M1, the lens 63 corrects distortion in accordance with the shape of the reflection mirror M1. In this way, an optical element optimally designed to improve the aberration correction ability may be provided between the reflecting mirror M1 and the image display device 35.

The video display device 35 includes, for example, 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 emitted from the light source device 100 (in other words, light source light). The light source device 100 typically includes an LED (Light Emitting Diode) light source.

The display panel 64 is typically a liquid crystal display (LCD). The display panel 64 creates a video based on the video data instructed and input from 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 image data, and emits image light (in other words, projection light). It emits as. In the configuration example of FIG. 3, the direction of emission of image light from the image display device 35 is the vertical direction (Z direction). The dashed-dotted line arrow indicates the optical axis of the image light.

Further, the display panel 64 is not limited to a liquid crystal panel, but may be a screen plate having a diffusion function. As a means of projecting an image onto a screen board with a diffusion function, there are methods that project an image of a DMD (Digital Micromirror Device) or liquid crystal panel in combination with a projection lens, or methods that use micro electro mechanical systems. good.

A condensing lens 63 is installed as a lens between the display panel 64 of the video display device 35 and the reflective mirror M2. This condensing lens 63 is a lens for adjusting the optical distance necessary for forming the virtual image 9, and has a function of magnifying the projected light from the display panel 64 and making it enter the second mirror M2.

The reflecting mirror M1 and the reflecting mirror M2 are, for example, free-form mirrors or mirrors having a shape asymmetrical to the optical axis. Reflection mirror M2 reflects the image light emitted from image display device 35 toward reflection mirror M1 through lens 63. The reflecting mirror M1 is, for example, a concave mirror (in other words, a magnifying mirror). The reflecting mirror M1 reflects and magnifies the image light reflected by the reflecting mirror M2 toward the windshield 3 through the opening 71 at an angle set by the drive mechanism 62, and projects it onto the display area 5.

As a result, the driver 6 (FIG. 2) can see the image projected onto the display area 5 as a virtual image 9 beyond the transparent windshield 3, which is superimposed on the scenery outside the vehicle (for example, roads, buildings, people, etc.). Visualize by shape. The virtual image 9, which is a projected image, can be of various types, such as a road sign, the current speed of the own vehicle, or various information added to objects on the landscape. This makes it possible to implement an augmented reality (AR) function that adds and displays various information to objects on the landscape.

In the configuration example of the video display unit 12 shown in FIGS. 2 and 3, the positions of the display area 5 and the virtual image 9 on the windshield 3 can be adjusted by adjusting the installation angle of the reflection mirror M1 using the drive mechanism 62. It has become. A drive mechanism 62 for changing the installation angle of the reflecting mirror M1 is attached to the reflecting mirror M1. The drive mechanism 62 is a mechanism including a stepping motor and the like. The drive mechanism 62 changes the installation angle of the reflection mirror M1 based on control from the control device. Furthermore, the installation angle of the reflective mirror M1 can also be changed based on the user's manual operation. Thereby, the position of the virtual image 9 that the driver 6 visually recognizes in the display area 5 can be adjusted, for example, in the vertical direction.

Further, for example, by increasing the area of the reflective mirror M1, the area of the display area 5 can be expanded, and more information can be projected onto the display area 5.

FIG. 4 is a perspective view showing the appearance of an example of mounting the HUD device 1 including the video display unit 12 of FIG. 3. As shown in FIG. An opening 71 is formed in the housing 61 . A transparent cover member 71a called a glare trap (anti-dazzle) or the like is installed in the opening 71. A reflective mirror M1 is installed inside the housing 61 so as to reflect the light from the reflective mirror M2 toward the cover member 71a of the opening 71.

[Control system of HUD device]
FIG. 5 is a functional block diagram showing a configuration example of the main parts of the control system in the HUD device 1 of FIG. 1. As shown in FIG. Moreover, FIG. 6 is a functional block diagram showing an example of a configuration related to the vehicle information acquisition unit 15, which is a part related to the acquisition of the vehicle information 4 in FIG.

The HUD device 1 in FIG. 5 includes a control device 10, a video display unit 12, a speaker 11, and a solar radiation sensor 66. The control device 10 includes, for example, an electronic control unit (ECU). The video display unit 12 has the configuration shown in FIGS. 2 and 3, and FIGS. 7 to 10, which will be explained later. Note that the control device 10 is not limited to being mounted inside the casing 61, but may be mounted outside the casing 61.

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 the projected image (virtual image 9) in the HUD device 1, the audio output, and the like. The control device 10 is configured by, for example, a wiring board. This wiring board is mounted, for example, in the casing 61 shown in FIGS. 3 and 4. 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, and a communication device mounted on this wiring board. 21 and the like.

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 within this control device 10 except for the MCU 16 may be installed within the MCU 16 as appropriate. Further, the control device 10 is not limited to implementation using the MCU 16, but may be implemented using an ECU or other semiconductor device.

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

As shown in FIG. 6, the vehicle information 4 is generated by information acquisition devices such as various sensors connected to the vehicle information acquisition section 15. FIG. 6 shows an example of various information acquisition devices. Note that the various information acquisition devices shown in FIG. 6 can be deleted, added to other types of devices, or replaced with other types of devices as appropriate.

For example, the vehicle speed sensor 41 detects the speed of the vehicle 2 in FIG. 1 and generates speed information as a detection result. The shift position sensor 42 detects the current gear and generates gear information as a detection result. The steering wheel steering angle sensor 43 detects the current steering angle of the steering wheel, and generates steering wheel angle information that is the detection result. The headlight sensor 44 detects ON/OFF of the headlight and generates lamp lighting information as a detection result.

The illuminance sensor 45 and the chromaticity sensor 46 detect external light and generate external light information as a detection result. The distance sensor 47 detects the distance between the vehicle 2 and an external object, and generates distance information as a detection result. The infrared sensor 48 detects the presence or absence of an object in a short distance from the vehicle 2, the distance, etc., and generates infrared information as a detection result. The engine starting sensor 49 detects ON/OFF of the engine and generates ON/OFF information as a detection result.

The acceleration sensor 50 and the 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 a detection result. The temperature sensor 52 detects the temperature inside and outside the vehicle, and generates temperature information as a detection result. For example, the temperature sensor 52 can detect the ambient temperature of the HUD device 1 . A temperature sensor may be separately installed in the HUD device 1.

The road-to-vehicle communication wireless transceiver 53 generates road-to-vehicle communication information through road-to-vehicle communication between the vehicle 2 and roads, signs, signals, and the like. The vehicle-to-vehicle communication wireless transceiver 54 generates vehicle-to-vehicle communication information through vehicle-to-vehicle communication between the vehicle 2 and other nearby vehicles. The in-vehicle camera 55 and the out-of-vehicle camera 56 generate in-vehicle camera image information and out-of-vehicle camera image information by photographing the inside and outside of the vehicle. Specifically, the in-vehicle camera 55 is, for example, a DMS (Driver Monitoring System) camera that photographs the posture, eye position, movement, etc. of the driver 6 in FIG. 2. In this case, by analyzing the captured video, it is possible to understand the fatigue status of the driver 6 and the position of the driver's line of sight.

On the other hand, the vehicle exterior camera 56 photographs the surrounding situation, such as the front and rear of the vehicle 2, for example. In this case, by analyzing the captured video, we can determine the presence of obstacles such as other vehicles and people in the surrounding area, buildings and terrain, road conditions such as rain, snow, ice, and unevenness, and road signs. Becomes understandable. The external camera 56 also includes, for example, a drive recorder that records video of the driving situation.

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

In FIG. 5, the MCU 16 receives such vehicle information 4 via the vehicle information acquisition unit 15. The MCU 16 generates audio data directed to the speaker 11, video data directed to the video display device 35, etc. based on the vehicle information 4 and the like. The MCU 16 includes an audio data generation section 27, a video data generation section 28, a distortion correction section 29, a light source adjustment section 30, a mirror adjustment section 31, and a protection processing section 75. These units are mainly realized by the CPU of the MCU 16 reading and executing programs stored in the nonvolatile memory 17 or the volatile memory 18.

The audio data generation unit 27 generates audio data based on the vehicle information 4 and the like, as necessary. The audio data is generated, for example, when providing audio guidance from a navigation system or when issuing a warning to the driver 6 using an AR function. The audio driver 19 drives the speaker 11 based on the audio data, and causes the speaker 11 to output audio.

The video data generation unit 28 generates video data that determines the display content of the projected video projected onto the display area 5 shown in FIG. 2, etc., based on the vehicle information 4 and the like. The distortion correction section 29 generates corrected video data by applying distortion correction to the video data from the video data generation section 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 image display device 35 is projected onto the display area 5, as shown in FIG.

The display driver 20 drives each display element (pixel) included in the display panel 64 in the video display device 35 based on the corrected video data from the distortion correction section 29 . Thereby, the video display device 35 creates and displays a video to be projected onto the display area 5 based on the corrected video data.

The light source adjustment unit 30 controls the brightness of a light source (LED element described below) in the video 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 reflection mirror M1 by driving the drive mechanism 62 in the image display unit 12 in FIG. .

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

The volatile memory 18 mainly stores the acquired vehicle information 4 and various data used in the processing steps of each part within 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 according to CAN, LIN, or the like. The communication unit 21 may be integrated with the vehicle information acquisition unit 15. Note that each part in the control device 10 in FIG. 5 may be implemented by a dedicated circuit such as an FPGA (Field Programmable Gate Array) as appropriate.

Next, an example of the structure of the HUD device 1 will be described using FIGS. 7 to 10. Note that the same content as described above may be omitted. In the case of the HUD device 1 shown in FIGS. 7 to 10, the image light (outgoing light) from the image display unit 12 is directed toward the image light reflecting surface (windshield 3) that stands up in front of the viewpoint of the driver of the vehicle 2. The difference is that the radiation is emitted from the above explanation.

First, a first embodiment will be described with reference to FIGS. 7 and 8. FIG. 7 is a schematic diagram showing a configuration example of a video display unit and the like that constitute the HUD device. FIG. 8 is a diagram showing an example in which the configuration of the HUD device in FIG. 7 is changed.

<First embodiment>
In the example of FIG. 7, the HUD device 1 is placed in front of the driver and inside the dashboard 11 in which an opening is formed. The front of the driver specifically refers to the front of the driver's viewpoint or the side of the steering wheel. Further, the emitted light or image light 10 generated by the image display device 35 and passing through the opening of the dashboard 11 is directed toward the display area so that it is emitted in front of the vehicle or in the traveling direction (or running direction) of the vehicle. A reflecting surface of a reflecting mirror (mirror) M1 that reflects the emitted light 10 is formed toward the front side of the vehicle or the direction in which the vehicle travels. Then, similarly to the above explanation, the outgoing light or image light 10 emitted from the image display device 35 is emitted to the windshield 3 via the opening of the dashboard 11. The emitted light or image light 10 is reflected by the windshield 3 and directed toward the driver's viewpoint 6. Then, the driver can visually recognize the virtual image 9 based on the emitted light or the image light 10. Further, as shown in FIG. 7, since the mirror M2 is not arranged, the optical path of the image light can be shortened. Thereby, the volume of the HUD device can be further reduced and the size of the HUD device can be reduced.

Next, an example in which the configuration of FIG. 7 is modified will be described using FIG. 8. In the example of FIG. 8, the number of reflecting mirrors is increased compared to the case of FIG. The HUD device 1 includes a mirror M2 that guides (reflects) the emitted light 10 to a subsequent reflective mirror M1 in the traveling direction of the emitted light 10. As shown in FIG. 8, the reflection mirror M1 that reflects the emitted light 10 toward the windshield 3 is arranged above the image display device 35, that is, arranged between the image display device 35 and the windshield 3. ing. Further, the reflective surface of the reflective mirror M1 is formed toward the front side of the vehicle or toward the traveling direction of the vehicle. With such a layout, the emitted light 10 from the video display device 35 can be guided above the video display device 35. Furthermore, if the length of the optical path of the image light in FIG. 8 is the same as the length of the optical path of the image light in FIG. 7, the size of the HUD device 1 in the longitudinal direction of the vehicle can be reduced by arranging the mirror M2. becomes possible.

Note that although this example shows a layout using two mirrors, the layout is not limited to this example. The optical layout may be changed as appropriate as long as the emitted light 10 from the video display device 35 is reflected by the rear reflective mirror M1 toward the front of the vehicle or the direction of travel of the vehicle.

As shown in FIGS. 7 and 8, when the windshield or windshield stands up in front of the driver, in the arrangement shown in FIGS. 2 to 4, the output light 10 is It is not easy to reflect the light on the windshield or windshield and provide a good display in the display area. As an example, good display can be achieved by using the structures shown in FIGS. 7 and 8.

Furthermore, the glare trap 13 is a transmitting part, which is disposed at the opening of the housing, and is a part through which the image light 10 is transmitted toward the display area, and may be a curved transparent member or a flat transparent member. You may use the member. FIGS. 7 and 8 are examples in which a transparent member with a curved surface is used. In the first embodiment, when viewed from the outside of the dashboard 11, the glare trap 13 (transparent part) is recessed toward the video display device 35 side, or recessed inside the housing, and has a concave shape. There is. In contrast to the concave surface of the glare trap 13, if a transparent member were placed in the opening of the dashboard 11, it would protrude toward the windshield or windshield, making it a convex surface. Further, the curvature of the surface (first surface) on which the glare trap 13 is arranged and the curvature of the surface (second surface) on which the opening of the dashboard 11 is formed are set to have the following relationship. That is, the curvature of the first surface that forms a curved surface that separates from the second surface is set, and the curvature of the second surface that forms a curved surface that separates from the first surface is set. That is, the curvature of the first surface that forms a curved surface that separates from the second surface is set for the second surface that forms a curved surface that separates from the second surface. By setting such a curvature, the emitted light 10 can be better emitted to the display area, and good display can be performed.

Next, a second embodiment will be described with reference to FIGS. 9 and 10. FIG. 9 is a schematic diagram showing a configuration example of a video display unit and the like that constitute the HUD device. FIG. 10 is a diagram showing an example in which the configuration of the HUD device in FIG. 9 is changed.

<Second embodiment>
The example in FIG. 9 has the same configuration as the example in FIG. 7, but the shape of the glare trap is different, and the glare trap 14 (transmission part) in FIG. 9 is planar. The angle formed by the windshield or windshield and the planar glare trap 14 is in the range of 55° or more and 90° or less. By adopting a configuration having this relationship, the emitted light 10 can be better emitted to the display area, and good display can be performed.

Next, an example in which the structure in FIG. 9 is modified will be described using FIG. 10. In the example of FIG. 10, the number of reflection mirrors is increased compared to the case of FIG. The configuration includes a mirror M2 that guides the emitted light 10. Also in the HUD device 1 shown in FIG. 10, the emitted light 10 from the video display device 35 can be guided above the video display device 35, as in the case of FIG. Furthermore, if the length of the optical path of the image light in FIG. 10 is the same as the length of the optical path of the image light in FIG. 9, it is possible to reduce the size of the HUD device in the longitudinal direction of the vehicle by arranging mirror M2. becomes.

Although the embodiments of the present invention have been specifically described above, the present invention is not limited to the above-described embodiments, and can be modified in various ways without departing from the gist. The components of the embodiment can be added, deleted, replaced, etc., except for essential components. Each component may be singular or plural unless specifically limited. A configuration combining various configuration examples is also possible.

In the first embodiment and the second embodiment, it is only necessary to emit the emitted light 10 to the front side and project the emitted light 10 onto the display area, and the layout (for example, the arrangement and number of mirrors) can be changed as appropriate. You may. Further, in the first embodiment and the second embodiment, the image light reflecting surface (specifically, the display area of the windshield 3) is set to be at an angle of 50° or more and 90° or less with respect to the horizontal plane, for example. be able to. Further, by using the configuration of the control system described in FIGS. 5 and 6, the HUD device 1 can perform similar displays.

In the HUD device 1 that emits the emitted light 10 forward, the intrusion of sunlight is suppressed. Therefore, the HUD device 1 may have a structure in which no polarizing filter used for sunlight protection is disposed between the display area and the video display device on the optical path of the emitted light 10, and the number of components may be reduced.

According to the technology according to the present embodiment, when the windshield is upright, in addition to displaying navigation information such as destination and speed projected on the windshield, alert information is displayed when an oncoming vehicle or pedestrian is detected. It is possible to prevent traffic accidents by providing an information display device (head-up display device) that allows you to visually check images of information necessary for driving, such as a display, and contributes to supporting safe driving. In this way, we will contribute to the 3 Sustainable Development Goals (SDGs) advocated by the United Nations: "Good health and well-being for all."

1 HUD device 3 Windshield 11 Dashboard 13 Glare trap 14 Glare trap

Claims (5)

A head-up display device for a vehicle,
an image display device that generates and emits image light;
an image light projection unit that reflects image light emitted from the image display device and projects it onto a display area of the vehicle;
disposed in front of the driver of the vehicle, and configured such that the image light reflected by the image light projection unit is directed toward the front side of the vehicle;
A head-up display device characterized by: The head-up display device according to claim 1,
A transmitting portion disposed in an opening of a casing housing the image display device and the image light projection unit is configured to be recessed inside the casing.
A head-up display device characterized by: The head-up display device according to claim 1,
A transmitting portion disposed in an opening of a casing housing the image display device and the image light projection portion is planar,
The angle formed by the windshield or windshield of the vehicle and the planar transparent portion is set to 55° or more and 90° or less,
A head-up display device characterized by: The head-up display device according to claim 1,
A deflection filter is not disposed between the display area and the image display device on the optical path of the image light;
A head-up display device characterized by: The head-up display device according to claim 1,
Disposed inside the dashboard of the vehicle, comprising a first surface provided with a transmission section that transmits the emitted light from the image light projection section, and a second surface provided with an opening through which the emitted light passes. is,
A curvature of the first surface that forms a curved surface that separates from the second surface is set with respect to the second surface that forms a curved surface that separates from the first surface.
A head-up display device characterized by:

Images