Head-up display

Abstract

This head-up display comprises: an image generation unit (24A) that emits light for generating a prescribed image; and a mirror that reflects the light emitted by the image generation unit (24A) so that the light is projected to a transmission member. The image generation unit (24A) includes: a light source (121); an optical member (130) that transmits light from the light source (121); and a liquid crystal member (110A) that generates an original image (112) for forming the prescribed image with light emitted from the optical member (130). The original image (112) is formed in a shape corresponding to the distortion of the prescribed image. The optical member (130) is formed in a shape that matches the shape of the original image (112).

Description

Technical Field

[0001] The present disclosure relates to a head-up display.

Background Art

[0002] In the future, it is expected that vehicles running in the automatic driving mode and vehicles running in the manual driving mode will coexist on public roads. In the future automated driving society, visual communication between vehicles and humans is expected to become increasingly important. For example, visual communication between a vehicle and the passengers of the vehicle is expected to become increasingly important. In this regard, a head-up display (HUD) can be used to realize visual communication between a vehicle and its passengers. The head-up display projects an image or video onto a windshield or a combiner, and superimposes the image on the real space through the windshield or the combiner so that the passengers can visually recognize it, thereby realizing so-called AR (Augmented Reality).

[0003] As an example of a head-up display, Patent Document 1 discloses a display device including an optical system for displaying a three-dimensional virtual image using a transparent display medium. The display device projects light within the driver's field of view onto a windshield or a combiner. A part of the projected light passes through the windshield or the combiner, while another part is reflected by the windshield or the combiner. This reflected light travels towards the driver's eyes. The driver perceives the reflected light that enters the eyes as a virtual image that appears to be an image of an object on the opposite side (outside of the vehicle) across the windshield or the combiner, with the real objects visible through the windshield or the combiner as the background.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in existing head-up displays, there is room for improvement in enhancing the visibility of virtual images (images).

[0006] Therefore, an object of the present disclosure is to provide a head-up display capable of improving the visibility of virtual images.

Means for Solving the Problems

[0007] To achieve the above object, a head-up display according to one aspect of the present disclosure is a head-up display configured to display a predetermined image, an image generation unit that emits light for generating the predetermined image, a mirror that reflects the light so that the light emitted by the image generation unit is irradiated onto a transmission member, and the image generation unit has a light source, an optical member that transmits the light from the light source, and a liquid crystal unit that generates an original image for forming the predetermined image by the light emitted from the optical member, the original image is formed in a shape corresponding to the distortion of the predetermined image, and the optical member is formed in a shape matching the shape of the original image.

[0008] Also, a head-up display according to one aspect of the present disclosure is a head-up display configured to display a predetermined image, an image generation unit that emits light for generating the predetermined image, a mirror that reflects the light so that the light emitted by the image generation unit is irradiated onto a transmission member, and the image generation unit has a plurality of light sources, It has at least a single optical member that transmits the light from each of the plurality of light sources and emits the light. The plurality of light sources are arranged at a pitch that matches the shape of the mirror so that the light emitted from the single optical member diffuses and enters the mirror.

Advantages of the Invention

[0009] According to the present disclosure, it is possible to provide a head-up display capable of improving the visibility of a virtual image.

Brief Description of the Drawings

[0010]

Figure 1

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Figure 3B

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Best Mode for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present invention (hereinafter referred to as "the present embodiment") will be described with reference to the drawings. The dimensions of each member shown in these drawings may differ from the actual dimensions of each member for convenience of explanation.

[0012] In the description of the present embodiment, for convenience of explanation, the "left - right direction", "up - down direction", and "front - rear direction" may be referred to as appropriate. These directions are relative directions set for the HUD (Head - Up Display) 20 shown in FIG. 2. Here, the "left - right direction" is a direction including the "left direction" and the "right direction". The "up - down direction" is a direction including the "up direction" and the "down direction". The "front - rear direction" is a direction including the "front direction" and the "rear direction". The left - right direction is orthogonal to the up - down direction and the front - rear direction and is not shown in FIG. 2.

[0013] Referring to FIG. 1, a vehicle system 2 including the HUD 20 according to the present embodiment will be described below. FIG. 1 is a block diagram of the vehicle system 2. The vehicle 1 on which the vehicle system 2 is mounted is a vehicle (automobile) capable of traveling in an autonomous driving mode.

[0014] As shown in FIG. 1, the vehicle system 2 includes a vehicle control unit 3, a sensor 5, a camera 6, a radar 7, an HMI (Human Machine Interface) 8, a GPS (Global Positioning System) 9, a wireless communication unit 10, and a storage device 11. The vehicle system 2 also includes a steering actuator 12, a steering device 13, a brake actuator 14, a brake device 15, an accelerator actuator 16, and an accelerator device 17. Further, the vehicle system 2 includes the HUD 20.

[0015] The vehicle control unit 3 is configured to control the running of the vehicle 1. The vehicle control unit 3 is constituted by, for example, at least one electronic control unit (ECU: Electronic Control Unit). The electronic control unit includes a computer system (such as a SoC (System on a Chip), etc.) having one or more processors and a memory, and an electronic circuit constituted by active elements such as transistors and passive elements such as resistors. The processor includes, for example, at least one of a CPU (Central Processing Unit), an MPU (Micro Processing Unit), a GPU (Graphics Processing Unit), and a TPU (Tensor Processing Unit). The CPU may be constituted by a plurality of CPU cores. The GPU may be constituted by a plurality of GPU cores. The memory includes a ROM (Read Only Memory) and a RAM (Random Access Memory). A vehicle control program may be stored in the ROM. For example, the vehicle control program may include an artificial intelligence (AI) program for autonomous driving. The AI program is a program (trained model) constructed by supervised or unsupervised machine learning (especially, deep learning) using a multi-layer neural network. Vehicle control programs, vehicle control data, and / or peripheral environment information indicating the peripheral environment of the vehicle 1 may be temporarily stored in the RAM. The processor may be configured to expand a program specified from various vehicle control programs stored in the ROM onto the RAM and execute various processes in cooperation with the RAM. Further, the computer system may be constituted by a non-von Neumann type computer such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field-Programmable Gate Array). Furthermore, the computer system may be constituted by a combination of a von Neumann type computer and a non-von Neumann type computer.

[0016] The sensor 5 includes at least one of an acceleration sensor, a speed sensor, and a gyro sensor. The sensor 5 is configured to detect the driving state of the vehicle 1 and output driving state information to the vehicle control unit 3. The sensor 5 may further include a seating sensor that detects whether the driver is sitting in the driver's seat, a face orientation sensor that detects the direction of the driver's face, an external weather sensor that detects the external weather condition, a human presence sensor that detects whether there is a person inside the vehicle, and the like.

[0017] The camera 6 is, for example, a camera including an imaging device such as a CCD (Charge-Coupled Device) or a CMOS (Complementary Metal-Oxide-Semiconductor). The camera 6 includes an external camera 6A and an internal camera 6B.

[0018] The external camera 6A is configured to acquire image data indicating the surrounding environment of the vehicle 1 and then transmit the image data to the vehicle control unit 3. The vehicle control unit 3 acquires surrounding environment information based on the transmitted image data. Here, the surrounding environment information may include information about objects (pedestrians, other vehicles, signs, etc.) existing outside the vehicle 1. For example, the surrounding environment information may include information about the attributes of the objects existing outside the vehicle 1 and information about the distance and position of the objects with respect to the vehicle 1. The external camera 6A may be configured as a monocular camera or a stereo camera.

[0019] The internal camera 6B is disposed inside the vehicle 1 and is configured to acquire image data indicating the passengers. The internal camera 6B functions as, for example, an eye-tracking camera that tracks the viewpoint E of the passengers (described later in FIG. 2). The internal camera 6B is provided, for example, near the rearview mirror or inside the instrument panel.

[0020] Radar 7 includes at least one of a millimeter-wave radar, a microwave radar, and a laser radar (e.g., a LiDAR unit). For example, the LiDAR unit is configured to detect the surrounding environment of Vehicle 1. In particular, the LiDAR unit is configured to acquire 3D mapping data (point cloud data) indicating the surrounding environment of Vehicle 1 and then transmit the 3D mapping data to the vehicle control unit 3. The vehicle control unit 3 identifies the surrounding environment information based on the transmitted 3D mapping data.

[0021] The HMI 8 includes an input unit that receives input operations from the driver and an output unit that outputs driving information and the like to the driver. The input unit includes a steering wheel, an accelerator pedal, a brake pedal, a driving mode switch for switching the driving mode of Vehicle 1, and the like. The output unit is a display (excluding the HUD) that displays various driving information.

[0022] The GPS 9 is configured to acquire the current position information of Vehicle 1 and output the acquired current position information to the vehicle control unit 3.

[0023] The wireless communication unit 10 is configured to receive information about other vehicles (e.g., driving information, etc.) around the vehicle 1 from other vehicles, and transmit information about the vehicle 1 (e.g., driving information, etc.) to other vehicles (vehicle-to-vehicle communication). Also, the wireless communication unit 10 is configured to receive infrastructure information from infrastructure facilities such as traffic lights and sign lights, and transmit the driving information of the vehicle 1 to the infrastructure facilities (road-to-vehicle communication). Further, the wireless communication unit 10 is configured to receive information about pedestrians from portable electronic devices (such as smartphones, tablets, wearable devices, etc.) carried by pedestrians, and transmit the own vehicle driving information of the vehicle 1 to the portable electronic devices (pedestrian-to-vehicle communication). The vehicle 1 may communicate directly with other vehicles, infrastructure facilities or portable electronic devices in an ad-hoc mode, or communicate via an access point. Furthermore, the vehicle 1 may communicate with other vehicles, infrastructure facilities or portable electronic devices via a communication network (not shown). The communication network includes at least one of the Internet, a local area network (LAN), a wide area network (WAN) and a radio access network (RAN). The wireless communication standard is, for example, Wi-Fi (registered trademark), Bluetooth (registered trademark), ZigBee (registered trademark), LPWA, DSRC (registered trademark) or Li-Fi. Also, the vehicle 1 may communicate with other vehicles, infrastructure facilities or portable electronic devices using the fifth generation mobile communication system (5G).

[0024] The storage device 11 is an external storage device such as a hard disk drive (HDD) or a solid state drive (SSD). Two-dimensional or three-dimensional map information and / or a vehicle control program may be stored in the storage device 11. For example, the three-dimensional map information may be composed of 3D mapping data (point cloud data). The storage device 11 is configured to output map information and a vehicle control program to the vehicle control unit 3 in response to a request from the vehicle control unit 3. The map information and the vehicle control program may be updated via the wireless communication unit 10 and the communication network.

[0025] When the vehicle 1 is running in the automatic driving mode, the vehicle control unit 3 automatically generates at least one of a steering control signal, an accelerator control signal, and a brake control signal based on the driving state information, the surrounding environment information, the current position information, the map information, etc. The steering actuator 12 is configured to receive the steering control signal from the vehicle control unit 3 and control the steering device 13 based on the received steering control signal. The brake actuator 14 is configured to receive the brake control signal from the vehicle control unit 3 and control the brake device 15 based on the received brake control signal. The accelerator actuator 16 is configured to receive the accelerator control signal from the vehicle control unit 3 and control the accelerator device 17 based on the received accelerator control signal. In this way, the vehicle control unit 3 automatically controls the running of the vehicle 1 based on the driving state information, the surrounding environment information, the current position information, the map information, etc. That is, in the automatic driving mode, the running of the vehicle 1 is automatically controlled by the vehicle system 2.

[0026] On the other hand, when the vehicle 1 is running in the manual driving mode, the vehicle control unit 3 generates a steering control signal, an accelerator control signal, and a brake control signal according to the driver's manual operations on the accelerator pedal, the brake pedal, and the steering wheel. In this way, in the manual driving mode, since the steering control signal, the accelerator control signal, and the brake control signal are generated by the driver's manual operations, the running of the vehicle 1 is controlled by the driver.

[0027] As described above, the driving mode consists of an automatic driving mode and a manual driving mode. The automatic driving mode includes, for example, a full automatic driving mode, a highly automated driving mode, and a driving assistance mode. In the full automatic driving mode, the vehicle system 2 automatically performs all driving controls such as steering control, brake control, and accelerator control, and the driver is not in a state where they can drive the vehicle 1. In the highly automated driving mode, the vehicle system 2 automatically performs all driving controls such as steering control, brake control, and accelerator control, and although the driver is in a state where they can drive the vehicle 1, they do not drive the vehicle 1. In the driving assistance mode, the vehicle system 2 automatically performs some of the driving controls such as steering control, brake control, and accelerator control, and the driver drives the vehicle 1 under the driving assistance of the vehicle system 2. On the other hand, in the manual driving mode, the vehicle system 2 does not automatically perform driving control, and the driver drives the vehicle 1 without the driving assistance of the vehicle system 2.

[0028] The HUD 20 is configured to display the HUD information as an image directed at the occupants of the vehicle 1 such that the predetermined information (hereinafter referred to as HUD information) is superimposed on the real space outside the vehicle 1 (particularly, the surrounding environment in front of the vehicle 1). The HUD information displayed by the HUD 20 is, for example, vehicle driving information related to the driving of the vehicle 1 and / or surrounding environment information related to the surrounding environment of the vehicle 1 (particularly, information related to objects existing outside the vehicle 1), etc. The HUD 20 is an AR display that functions as a visual interface between the vehicle 1 and the occupants.

[0029] The HUD 20 includes an image generation unit 24 and a control unit 25. The image generation unit (PGU: Picture Generation Unit) 24 is configured to emit light for generating a predetermined image to be displayed to the occupants of the vehicle 1. The image generation unit 24 can emit light for generating a changing image that changes according to the situation of the vehicle 1, for example.

[0030] The control unit 25 controls the operations of each part of the HUD 20. The control unit 25 is connected to the vehicle control unit 3, and based on vehicle driving information, surrounding environment information, etc. transmitted from the vehicle control unit 3, it controls the operations of each part of the HUD 20, such as the image generation unit 24. The control unit 25 is equipped with a processor such as a CPU and a memory, and the processor executes the computer program read from the memory to control the operations of the image generation unit 24 and the like. In this embodiment, the vehicle control unit 3 and the control unit 25 are provided as separate configurations, but the vehicle control unit 3 and the control unit 25 may be integrally configured. For example, the vehicle control unit 3 and the control unit 25 may be configured by a single electronic control unit.

[0031] FIG. 2 is a schematic view of the HUD 20 as seen from the side of the vehicle 1. At least a part of the HUD 20 is located inside the vehicle 1. Specifically, the HUD 20 is installed at a predetermined location inside the vehicle 1. For example, the HUD 20 may be arranged inside the dashboard of the vehicle 1.

[0032] As shown in FIG. 2, the HUD 20 includes a HUD main body 21. The HUD main body 21 has a main body housing 22 and an emission window 23. The emission window 23 is composed of a transparent plate that transmits visible light. The HUD main body 21 has an image generation unit 24, a control unit 25, and a concave mirror 26 (an example of a mirror) inside the main body housing 22.

[0033] The image generation unit 24 is installed inside the main body housing 22 so as to face the front of the HUD 20. The image generation unit 24 has a light emission surface 110 (an example of a liquid crystal part) that emits light for generating an image toward the outside. A predetermined light emission region 110A for emitting light for generating a predetermined image to be displayed toward the occupant of the vehicle 1 is provided on the light emission surface 110. The predetermined light emission region 110A will be described later with reference to FIG. 4.

[0034] The concave mirror 26 is disposed on the optical path of the light emitted from the image generation unit 24. The concave mirror 26 is configured to reflect the light emitted from the image generation unit 24 toward the windshield 18 (for example, the front window of the vehicle 1). The concave mirror 26 has a reflecting surface that is curved in a concave shape to form a predetermined image, and reflects the image of the light emitted from the image generation unit 24 and formed into an image at a predetermined magnification. The concave mirror 26 may have, for example, a drive mechanism 27 and may be configured to be able to change the position and orientation of the concave mirror 26 based on a control signal transmitted from the control unit 25.

[0035] Based on the vehicle driving information, surrounding environment information, etc. transmitted from the vehicle control unit 3, the control unit 25 generates a control signal for controlling the operation of the image generation unit 24, and transmits the generated control signal to the image generation unit 24. Further, the control unit 25 may generate a control signal for changing the position and orientation of the concave mirror 26, and transmit the generated control signal to the drive mechanism 27.

[0036] The light emitted from the light emission surface 110 of the image generation unit 24 is reflected by the concave mirror 26 and emitted from the emission window 23 of the HUD main body unit 21. The light emitted from the emission window 23 of the HUD main body unit 21 is irradiated onto the windshield 18, which is a transmissive member. A part of the light irradiated from the emission window 23 onto the windshield 18 is reflected toward the viewpoint E of the occupant. As a result, the occupant recognizes the light emitted from the HUD main body unit 21 as a virtual image (predetermined image) formed at a predetermined distance in front of the windshield 18. In this way, as a result of the image displayed by the HUD 20 being superimposed on the real space in front of the vehicle 1 through the windshield 18, the occupant can visually recognize the virtual image object I formed by the predetermined image as floating on the road located outside the vehicle.

[0037] Here, the viewpoint E of the occupant may be either the viewpoint of the left eye or the viewpoint of the right eye of the occupant. Alternatively, the viewpoint E may be defined as the midpoint of the line segment connecting the viewpoint of the left eye and the viewpoint of the right eye. The position of the occupant's viewpoint E is specified, for example, based on the image data acquired by the in-vehicle camera 6B. The position of the occupant's viewpoint E may be updated at a predetermined cycle, or may be determined only once when the vehicle 1 is started.

[0038] In addition, when forming a 2D image (planar image) as the virtual object I, a predetermined image is projected so as to be a virtual image at a single distance arbitrarily determined. When forming a 3D image (stereoscopic image) as the virtual object I, a plurality of predetermined images that are the same as or different from each other are projected so as to be virtual images at different distances. Further, the distance of the virtual object I (the distance from the occupant's viewpoint E to the virtual image) can be appropriately adjusted by adjusting the distance from the image generation unit 24 to the occupant's viewpoint E (for example, adjusting the distance between the image generation unit 24 and the concave mirror 26).

[0039] By the way, since the light emitted from the light emission surface 110 of the image generation unit 24 is reflected by the concave mirror 26, distortion due to the reflection of the concave mirror 26 occurs in the virtual object I recognized by the occupant as a predetermined image. Therefore, in order to enable the occupant to accurately recognize the information of the virtual object I, for example, it is desirable to correct the distortion of the generated virtual object I.

[0040] Next, the distortion occurring in the virtual object and the process for correcting the distortion (correction by image warping) will be described with reference to FIGS. 3A, 3B, 4, and 5.

[0041] FIG. 3A is a diagram showing an example of an image 312 on the light emitting surface 310 of the image generation unit of the HUD according to the comparative example, that is, an image generated by the light emitted from the image generation unit (hereinafter also referred to as the emission surface image), which is an image before being reflected by the concave mirror. Further, FIG. 3B is a diagram showing a virtual object X recognized by the occupant as a predetermined image after the emission surface image 312 shown in FIG. 3A is reflected by the concave mirror. Note that information indicating the traveling speed (50 km / h) of the host vehicle is displayed in the images shown in FIGS. 3A and 3B.

[0042] As shown in FIG. 3A, when the emission surface image 312 on the light emitting surface 310 of the image generation unit according to the comparative example is a normal image, for example, an image that has not been subjected to a predetermined correction process for distortion caused by reflection by a concave mirror, the virtual object X generated by the light reflected by the concave mirror is visually recognized as a distorted-shaped image as shown in FIG. 3B. In the case of this comparative example, the virtual object X is visually recognized as an image having a curved shape with its upper side extended and its lower side shrunk.

[0043] On the other hand, in the image generation unit 24 of the HUD 20 according to the present embodiment, in order to correct the distortion of the image caused by reflection by the concave mirror 26, an inverse correction process (also referred to as a correction process by warping) is performed on the emission surface image in advance.

[0044] FIG. 4 is a diagram showing an example of an emission surface image 112 generated by the light emitted from the image generation unit 24 of the HUD 20. FIG. 5 is a diagram showing a virtual object I recognized by the occupant as a predetermined image after the emission surface image 112 shown in FIG. 4 is reflected by the concave mirror 26.

[0045] As shown in FIG. 4, the light emitting surface 110 of the image generation unit 24 is formed in a rectangular shape, and a predetermined light emitting region 110A for emitting light for generating a predetermined image is provided. And, an emission surface image 112 is generated in the predetermined light emitting region 110A by the light emitted from the predetermined light emitting region 110A. In the emission surface image 112 of this example, a speed image notifying that the current traveling speed is 50 km / h is displayed, similar to the comparative examples shown in FIGS. 3A and 3B.

[0046] Among the rectangular light emitting surface 110, the predetermined light emitting region 110A is formed, for example, as an annular sector-shaped emitting region. The annular sector-shaped predetermined light emitting region 110A is an emitting region that forms a rectangular display range 114 in which the virtual object I shown in FIG. 5 is displayed. The predetermined light emitting region 110A is formed, for example, so as to occupy a region where the annular sector extends to the maximum extent on the light emitting surface 110 in order to form a large display range 114.

[0047] In the examples shown in FIGS. 4 and 5, a correction process by warping is performed on the emission surface image 112 of the predetermined light emitting region 110A. The emission surface image 112 of the predetermined light emitting region 110A is corrected by stretching the upper side of the image in advance by an amount distorted by the reflection of the concave mirror 26 and shrinking the lower side of the image in order to correct the distortion caused by being reflected by the concave mirror 26.

[0048] The degree of distortion generated in the virtual object I based on the reflection by the concave mirror 26 is, for example, as can be seen from the virtual object X in FIG. 3B, smaller as it approaches the central region of the virtual object I and larger in the end region away from the central region. For this reason, the correction amount by warping applied to the emission surface image 112 that is the original image of the virtual object I differs depending on the position of the emission surface image 112 corresponding to the degree of distortion depending on the part of the virtual object I. For example, the correction amount of the emission surface image in the region corresponding to the central part of the virtual object I is relatively small, and the correction amount of the emission surface image in the region corresponding to the end part away from the central part of the virtual object I is relatively large.

[0049] As described above, the exit surface image 112, which is the original image for forming a predetermined image, is formed in a shape that has been subjected to inverse correction processing in which it is pre-distorted in the reverse direction by the amount of distortion caused by reflection by the concave mirror 26. Therefore, when the light that generates the exit surface image 112 is reflected by the concave mirror 26, as shown in FIG. 5, it is visually recognized as a virtual object I having, for example, a horizontally long rectangular shape without distortion.

[0050] (First Embodiment) Next, with reference to FIGS. 6 and 7, the HUD 20A according to the first embodiment will be described. FIG. 6 is a horizontal cross-sectional view of the image generation unit 24A included in the HUD 20A. FIG. 7 is a schematic view of the image generation unit 24A as viewed from the front side (the light exit surface 110 side). As shown in FIG. 6, the image generation unit 24A includes a light source substrate 120 on which a plurality of light sources 121 (in this example, seven light sources, the first light source 121A to the seventh light source 121G) are mounted, a lens 130 (an example of an optical member) disposed on the front side of the light source 121, and a light exit surface 110 disposed on the front side of the lens 130. The image generation unit 24A further includes a lens holder 140 disposed on the front side of the light source substrate 120, a heat sink 150 disposed on the rear side of the light source substrate 120, and a PGU housing 160.

[0051] The light sources 121 (the first light source 121A to the seventh light source 121G) are, for example, laser light sources or LED light sources. The laser light source is, for example, an RGB laser light source configured to emit red laser light, green laser light, and blue laser light, respectively. The first light source 121A to the seventh light source 121G are arranged on the light source substrate 120 at regular intervals in the left-right direction. The light source substrate 120 is, for example, a printed circuit board made of an insulator on which electrical circuit wiring is printed on the surface or inside of the board.

[0052] The lens 130 has an incident surface 132 on which light from the light source 121 is incident and an exit surface 133 from which the incident light exits. The lens 130 is, for example, an aspherical convex lens in which both the incident surface 132 and the exit surface 133 are formed in a convex shape. The lens 130 is configured to transmit or reflect the light emitted from the light source 121 and emit it toward the light exit surface 110. Prisms, diffuser plates, magnifying glasses, etc. may be appropriately added to the lens 130 that functions as an optical member.

[0053] The lens 130 is configured by arranging seven aspherical convex lenses corresponding to the first light source 121A to the seventh light source 121G in parallel in the left - right direction. Portions of adjacent aspherical convex lenses of the lens 130 are joined in parallel. The lens 130 has a first region 131A that transmits the first light emitted from the first light source 121A, a second region 131B that transmits the second light emitted from the second light source 121B, a third region 131C that transmits the third light emitted from the third light source 121C, a fourth region 131D that transmits the fourth light emitted from the fourth light source 121D, a fifth region 131E that transmits the fifth light emitted from the fifth light source 121E, a sixth region 131F that transmits the sixth light emitted from the sixth light source 121F, and a seventh region 131G that transmits the seventh light emitted from the seventh light source 121G. The incident surfaces 132A of the first region 131A, 132B of the second region 131B, 132C of the third region 131C, 132D of the fourth region 131D, 132E of the fifth region 131E, 132F of the sixth region 131F, and 132G of the seventh region 131G are convex incident surfaces facing rearward. The exit surfaces 133A of the first region 131A, 133B of the second region 131B, 133C of the third region 131C, 133D of the fourth region 131D, 133E of the fifth region 131E, 133F of the sixth region 131F, and 133G of the seventh region 131G are convex exit surfaces facing forward. The lens 130 is attached to the lens holder 140 such that the centers of the light - emitting surfaces of the first light source 121A to the seventh light source 121G are respectively at the focal positions.

[0054] The light-emitting surface 110 is a liquid crystal display, a DMD (Digital Mirror Device), or the like. The light-emitting surface 110 forms light for generating an image by the light of the light source 121 transmitted through the lens 130. The light-emitting surface 110 is attached to the front portion of the PGU housing 160 with the emission surface facing forward of the image generation unit 24A. The drawing method of the image generation unit 24A may be a raster scan method, a DLP method, or an LCOS method. When the DLP method or the LCOS method is adopted, the light source 121 of the image generation unit 24A may be an LED light source. When the liquid crystal display method is adopted, the light source 121 of the image generation unit 24A may be a white LED light source.

[0055] The lens holder 140 holds the lens 130 in the PGU housing 160 so that the light emitted from the light source 121 is correctly incident on the incident surface 132 of the lens 130.

[0056] The heat sink 150 is formed of highly thermally conductive aluminum, copper, or the like. The heat sink 150 is provided in contact with the back surface of the light source substrate 120 to dissipate the heat generated from the light source substrate 120.

[0057] The light emitted from the first light source 121A to the seventh light source 121G is incident on the incident surfaces 132A to 132G of the lens 130. Since the shape of the lens 130 is a shape in which seven aspherical convex lenses are connected in parallel as described above, most of the light emitted from the first light source 121A is incident on the first region 131A of the lens 130, for example, as shown in the first optical path 122A, and becomes light parallel to the optical axis 125A and is emitted from the first region 131A and incident on the light-emitting surface 110. Although not shown, similarly, most of the light emitted from the second light source 121B to the seventh light source 121G is incident on the second region 131B to the seventh region 131G, respectively, and becomes light parallel to the respective optical axes of the second light source 121B to the seventh light source 121G and is incident on the light-emitting surface 110.

[0058] As shown in FIG. 7, the lens 130 is formed by stacking a plurality of stages in the vertical direction with seven aspherical convex lenses arranged in parallel in the left - right direction corresponding to the light sources. The lens 130 in this example includes a first region 131A to a seventh region 131G (an example of a convex surface portion) arranged in parallel in the left - right direction corresponding to the first light source 121A to the seventh light source 121G, and an eighth region 131H to a fourteenth region 131N (an example of a convex surface portion) arranged in parallel in the left - right direction corresponding to the eighth light source 121H to the fourteenth light source 121N, which are stacked in two stages in the vertical direction. Each light source 121 indicated by a dashed line is arranged behind the lens 130.

[0059] An annular - sector - shaped predetermined light - emitting region 110A is formed on the light - emitting surface 110, and an emission - surface image (50 km / h) 112, which is the original image of a predetermined image forming a virtual object I, is generated in the predetermined light - emitting region 110A. Then, a correction process by warping is applied to the emission - surface image 112.

[0060] The lens 130 in which the first region 131A to the seventh region 131G and the eighth region 131H to the fourteenth region 131N are stacked in two stages in the vertical direction is formed in a shape that matches the shape of the emission - surface image 112 to which a correction process by warping has been applied. Specifically, the lens 130 is formed in a curved shape according to the shape of the emission - surface image 112 to which a correction process by warping has been applied. The first region 131A to the seventh region 131G of the lens 130 are arranged such that a virtual line connecting the centers of their respective emission surfaces 133A to 133G is a curve when viewed from the front. Similarly, the eighth region 131H to the fourteenth region 131N of the lens 130 are arranged such that a virtual line connecting the centers of their respective emission surfaces 133H to 133N is a curve when viewed from the front.

[0061] In addition, the first light source 121A to the seventh light source 121G corresponding to the first region 131A to the seventh region 131G are also arranged such that the virtual lines connecting these light sources become curves in accordance with the shape of the emission surface image 112 that has been subjected to correction processing by warping. Similarly, the eighth light source 121H to the fourteenth light source 121N corresponding to the eighth region 131H to the fourteenth region 131N are also arranged such that the virtual lines connecting these light sources become curves.

[0062] Among the first region 131A to the seventh region 131G in the lens 130, the fourth region 131D arranged at the center is a lens that emits light for forming the central region of the emission surface image 112. Also, among the first region 131A to the seventh region 131G, the first region 131A and the seventh region 131G arranged at the ends away from the center are lenses that emit light for forming the end regions of the emission surface image 112. Similarly, among the eighth region 131H to the fourteenth region 131N in the lens 130, the eleventh region 131K arranged at the center is a lens that emits light for forming the central region of the emission surface image 112. Also, among the eighth region 131H to the fourteenth region 131N, the eighth region 131H and the fourteenth region 131N arranged at the ends away from the center are lenses that emit light for forming the end regions of the emission surface image 112.

[0063] As described above, the degree of distortion generated in the virtual object I based on the reflection by the concave mirror 26 is smaller as it approaches the central region of the virtual object I and larger in the end regions away from the central region. For this reason, the correction amount by warping applied to the emission surface image 112, which is the original image of the virtual object I, is smaller in the region corresponding to the central part of the virtual object I in the emission surface image 112 and larger in the region corresponding to the end away from the central part of the virtual object I in the emission surface image 112.

[0064] The first region 131A to the fourteenth region 131N of the lens 130 are preferably formed such that they have different shapes between the region that emits light for forming the central region of the exit surface image 112 and the region that emits light for forming the peripheral region of the exit surface image 112. For example, the first region 131A to the fourteenth region 131N may be configured such that the curvatures of the surfaces constituting the respective exit surfaces 133A to 133N are made different from each other according to the degree of distortion generated in each region (central region, end region, intermediate region) of the virtual object I based on the reflection by the concave mirror 26.

[0065] As described above, the HUD 20A according to the first embodiment includes an image generation unit 24A that emits light for generating a predetermined image, and a concave mirror 26 that reflects the light emitted by the image generation unit 24A so as to irradiate the windshield 18. The image generation unit 24A includes a light source 121, a lens 130 that transmits the light from the light source 121, and a predetermined light emission region 110A of a light emission surface 110 where a source image for forming a predetermined image is generated by the light emitted from the lens 130. The source image is formed in a shape corresponding to the distortion of the predetermined image, and the lens 130 is formed in a shape matching the shape of the source image. Specifically, the emission surface image 112, which is the source image, is pre-formed in a shape that corrects a predetermined image distortion generated when the emission surface image 112 is reflected by the concave mirror 26. The lens 130 is formed in a shape matching the shape of the emission surface image 112 when viewed from the light emission surface 110 side. In addition, in order to correct the image distortion caused by the reflection of the emission surface image 112 (source image) displayed in the predetermined light emission region 110A of the light emission surface 110 by the concave mirror 26, an inverse correction process (correction process by warping) is pre-applied to the emission surface image 112 displayed on the predetermined light emission region 110A. According to the configuration of the above HUD 20, since the shape of the lens 130 (the first region 131A to the seventh region 131G and the eighth region 131H to the fourteenth region 131N) is formed to match the shape of the emission surface image 112, the utilization efficiency of the light emitted from the light source with respect to the predetermined light emission region 110A where the emission surface image 112 corrected by the warping process is displayed can be improved. As a result, the visibility of the virtual object I can be improved.

[0066] Further, according to the HUD 20A, the shape of the lens 130 is a curved shape. When it is desired to display the rectangular virtual object I toward the occupant, the emission surface image 112 (source image) is preferably formed in a curved shape in consideration of the correction process by warping. By forming the lens 130 in a curved shape to match the curved shape of the emission surface image 112, the utilization efficiency of the light emitted from the lens 130 toward the predetermined light emission region 110A of the light emission surface 110 can be easily improved.

[0067] Also, according to the HUD20A, the light source 121 includes the first light source 121A to the fourteenth light source 121N, and the lens 130 includes the first region 131A to the fourteenth region 131N which are a plurality of convex portions that transmit light from each of the first light source 121A to the fourteenth light source 121N. And the first light source 121A to the seventh light source 121G and the eighth light source 121H to the fourteenth light source 121N are arranged in a curved shape when viewed from the light emitting surface 110 side, and the first region 131A to the seventh region 131G and the eighth region 131H to the fourteenth region 131N are arranged in a curved shape when viewed from the light emitting surface 110 side. According to this configuration, since a plurality of light sources and a plurality of convex portions are used, for example, when displaying a large virtual object I, the utilization efficiency of the light emitted to the predetermined light emitting region 110A of the light emitting surface 110 can be improved.

[0068] Also, according to the HUD20A, a predetermined image (virtual object I) is formed in a horizontally long rectangular shape, and the distortion degree of the end region of the predetermined image is larger than the distortion degree of the central region of the predetermined image. And according to the difference between the distortion degree of the central region and the distortion degree of the end region, the shapes of the convex portions arranged corresponding to the central region and the convex portions arranged corresponding to the end region among the first region 131A to the fourteenth region 131N which are a plurality of convex portions are different. Among the virtual object I, the end region is likely to have a larger distortion due to reflection by the concave mirror 26 compared to the central region. Therefore, by making the shapes of the convex portions arranged on the center side (for example, the fourth region 131D, the eleventh region 131K) and the convex portions arranged on the end side (for example, the first region 131A, the seventh region 131G, the eighth region 131H, the fourteenth region 131N) different, the distortion of the image can be appropriately corrected.

[0069] (Second Embodiment) With reference to FIGS. 8 and 9, the HUD20B according to the second embodiment will be described. FIG. 8 is a schematic view of the image generation unit 24B included in the HUD 20B as seen from above. As shown in FIG. 8, also in the case of the image generation unit 24B, a plurality of light sources and lenses configured to correspond to these light sources are provided, similar to the image generation unit 24A of the first embodiment.

[0070] In the example shown in FIG. 8, five light sources, i.e., a first light source 221A to a fifth light source 221E, are provided. The first light source 221A to the fifth light source 221E are arranged in parallel in the left-right direction. The lens 230 is a single lens in which five aspherical convex lenses corresponding to the first light source 221A to the fifth light source 221E are arranged in parallel along the left-right direction, and a part of adjacent aspherical convex lenses are joined in parallel.

[0071] The lens 230 has a first region 231A that transmits the first light emitted from the first light source 221A, a second region 231B that transmits the second light emitted from the second light source 221B, a third region 231C that transmits the third light emitted from the third light source 221C, a fourth region 231D that transmits the fourth light emitted from the fourth light source 221D, and a fifth region 231E that transmits the fifth light emitted from the fifth light source 221E. The incident surface 232A of the first region 231A, the incident surface 232B of the second region 231B, the incident surface 232C of the third region 231C, the incident surface 232D of the fourth region 231D, and the incident surface 232E of the fifth region 231E are convex incident surfaces facing rearward. The emission surface 233A of the first region 231A, the emission surface 233B of the second region 231B, the emission surface 233C of the third region 231C, the emission surface 233D of the fourth region 231D, and the emission surface 233E of the fifth region 231E are convex emission surfaces facing forward.

[0072] Note that members having the same reference numerals as those of the image generation unit 24A of the first embodiment described above have the same functions, and thus the description will be omitted as appropriate.

[0073] The first light source 221A to the fifth light source 221E are arranged at pitches adapted to the shape of the concave mirror 26 such that the light emitted from the first light source 221A to the fifth light source 221E, passing through the lens 230, and emitted from the exit surface 233 of the lens 230 diffuses and travels toward the concave mirror 26. The first light source 221A to the fifth light source 221E are arranged such that the respective pitches P1 to P4 of the first light source 221A to the fifth light source 221E are shorter than the respective pitches P5 to P8 of the vertices of the exit surfaces 233A to 233E of the lens 230.

[0074] For example, the pitch P1 between the first light source 221A and the second light source 221B is shorter than the pitch P5 between the vertex of the exit surface 233A of the first region 231A and the vertex of the exit surface 233B of the second region 231B in the lens 230. Similarly, the pitch P2 between the second light source 221B and the third light source 221C is shorter than the pitch P6 between the vertex of the exit surface 233B of the second region 231B and the vertex of the exit surface 233C of the third region 231C of the lens 230. The pitch P3 between the third light source 221C and the fourth light source 221D is shorter than the pitch P7 between the vertex of the exit surface 233C of the third region 231C and the vertex of the exit surface 233D of the fourth region 231D of the lens 230. The pitch P4 between the fourth light source 221D and the fifth light source 221E is shorter than the pitch P8 between the vertex of the exit surface 233D of the fourth region 231D and the vertex of the exit surface 233E of the fifth region 231E of the lens 230.

[0075] The first light source 221A to the fifth light source 221E are arranged such that the light emitted from the first light source 221A to the fifth light source 221E, passing through the lens 230, and emitted from the exit surface 233 of the lens 230 is incident on the concave mirror 26 at a substantially perpendicular angle. For example, the first light source 221A to the fifth light source 221E are arranged such that the light passing through the optical axis of the lens 230 or a path close to the path of the light passing through the optical axis is incident on the concave mirror 26 at a substantially perpendicular angle.

[0076] For example, the first light source 221A is arranged such that, among the light emitted from the first light source 221A, passing through the first region 231A of the lens 230, and exiting from the exit surface 233A, the light L1 passing through a path on or close to the path of the light on the optical axis in the first region 231A is incident on the concave mirror 26 at a substantially perpendicular angle. Similarly, the second light source 221B is arranged such that, among the light emitted from the second light source 221B, passing through the second region 231B of the lens 230, and exiting from the exit surface 233B, the light L2 passing through a path on or close to the path of the light on the optical axis in the second region 231B is incident on the concave mirror 26 at a substantially perpendicular angle. The third light source 221C is arranged such that, among the light emitted from the third light source 221C, passing through the third region 231C of the lens 230, and exiting from the exit surface 233C, the light L3 passing through a path on or close to the path of the light on the optical axis in the third region 231C is incident on the concave mirror 26 at a substantially perpendicular angle. The fourth light source 221D is arranged such that, among the light emitted from the fourth light source 221D, passing through the fourth region 231D of the lens 230, and exiting from the exit surface 233D, the light L4 passing through a path on or close to the path of the light on the optical axis in the fourth region 231D is incident on the concave mirror 26 at a substantially perpendicular angle. The fifth light source 221E is arranged such that, among the light emitted from the fifth light source 221E, passing through the fifth region 231E of the lens 230, and exiting from the exit surface 233E, the light L5 passing through a path on or close to the path of the light on the optical axis in the fifth region 231E is incident on the concave mirror 26 at a substantially perpendicular angle.

[0077] Furthermore, the first region 231A to the fifth region 231E (an example of a convex surface portion) of the lens 230 are formed to have different shapes between the region that emits light for forming the central region of the exit surface image and the region that emits light for forming the peripheral region of the exit surface image. For example, among the first region 231A to the fifth region 231E, the shape of the third region 231C that emits light for forming the central region of the exit surface image is formed to be symmetric about the left and right. In contrast, the shapes of the first region 231A, the second region 231B, the fourth region 231D, and the fifth region 231E that emit light for forming the peripheral region of the exit surface image are formed to be asymmetric about the left and right. The degree of asymmetry is larger in the region that emits light for forming the end portion of the exit surface image. In the first region 231A, the second region 231B, the fourth region 231D, and the fifth region 231E, the degree of asymmetry of the first region 231A and the fifth region 231E is larger than the degree of asymmetry of the second region 231B and the fourth region 231D.

[0078] FIG. 9 is a diagram showing the asymmetry of the shape of the first region 231A in the lens 230. As shown in FIG. 9, the first region 231A is formed such that the inclination (degree of bending) of the curved surface 233A1 on the left side (the side far from the second region 231B) is gentler than the inclination (degree of bending) of the curved surface 233A2 on the right side (the side close to the second region 231B) on the exit surface 233A. That is, it is formed such that the curvature of the curved surface 233A1 on the left side of the exit surface 233A is smaller than the curvature of the curved surface 233A2 on the right side. Although illustration is omitted, similarly, the second region 231B is formed such that the curvature on the side close to the first region 231A is smaller than the curvature on the side close to the third region 231C on the exit surface 233B. And the difference in curvature between the left side and the right side of the exit surface is formed to be larger for the exit surface 233A of the first region 231A than for the exit surface 233B of the second region 231B.

[0079] In contrast, although illustration is omitted, the fifth region 231E is formed such that the curvature on the right side (the side farther from the fourth region 231D) is smaller than the curvature on the left side (the side closer to the fourth region 231D) at the emission surface 233E. Also, the fourth region 231D is formed such that the curvature on the side closer to the fifth region 231E is smaller than the curvature on the side closer to the third region 231C at the emission surface 233D. And the difference in curvature between the left side and the right side of the emission surface is formed such that it is larger at the emission surface 233E of the fifth region 231E than at the emission surface 233D of the fourth region 231D.

[0080] Note that FIG. 8 shows the case of viewing the image generation unit 24B from above. However, for example, when viewing the image generation unit 24B from the left side or the right side, the shape of the lens may be similarly varied for each region. For example, when the lens has convex portions stacked in a plurality of stages in the vertical direction, the shape of the convex portion that emits light for forming the central region of the emission surface image may be made different from the shape of the convex portion that emits light for forming the upper and lower end regions of the emission surface image.

[0081] By the way, in the image generation unit mounted on a conventional HUD, for example, as shown in FIG. 10, the pitch Px between the light sources 321A to 321E and the pitch Py between the vertices of the emission surfaces 333A to 333E (convex portions) in the first region 331A to the fifth region 331E of the lens 330 were made the same pitch. Also, the curvature of the emission surfaces 333A to 333E was set such that the light La to Le emitted from the first region 331A to the fifth region 331E would be parallel to the optical axes of the respective light sources 321A to 321E. However, in such a configuration, since the amount of light emitted toward the peripheral portion of the concave mirror 326 is reduced, there may occur a problem that the luminance of the peripheral virtual image portion in the virtual object generated by the reflected light of the concave mirror 326 decreases. In order to suppress such a decrease in the luminance of the peripheral virtual image portion, in the conventional example, for example, it was necessary to add a diffusing lens for diffusing the light La to Le emitted from the first region 331A to the fifth region 331E.

[0082] In contrast, the HUD 20B according to the second embodiment includes an image generation unit 24B that emits light for generating a predetermined image, and a concave mirror 26 that reflects light so that the light emitted by the image generation unit 24B is irradiated onto the windshield 18. The image generation unit 24A includes at least a first light source 221A to a fifth light source 221E, and a single lens 230 that transmits the light from each of the first light source 221A to the fifth light source 221E and emits the light. The first light source 221A to the fifth light source 221E are arranged at a pitch that matches the shape of the concave mirror 26 so that the light emitted from the single lens 230 is diffused and incident on the concave mirror 26. According to this configuration, by making diffused light incident on the concave mirror 26 from the single lens 230, the uniformity of the luminance distribution of the virtual object I generated by the reflected light of the concave mirror 26 can be improved. As a result, the visibility of the virtual object I can be improved. In addition, since the optical member for obtaining diffused light can be configured by the single lens 230, there is no need to add a separate member such as a diffusion plate, and miniaturization and cost reduction of the HUD 20B can be achieved.

[0083] Also, according to the configuration of the HUD 20B, the single lens 230 has first regions 231A to 231E of the lens 230 that are a plurality of convex portions arranged in parallel along the parallel direction of the first light source 221A to the fifth light source 221E so as to emit the light from each of the first light source 221A to the fifth light source 221E. The first light source 221A to the fifth light source 221E are arranged such that the pitch of the first light source 221A to the fifth light source 221E is shorter than the pitch of each vertex of the first regions 231A to 231E of the lens 230. According to this configuration, the light emitted from each of the regions 231A to 231E of the lens 230 toward the concave mirror 26 can be diffused more than when the pitch between the light sources and the pitch between the vertices of the emission surface (convex portion) of the lens are the same. Thereby, the uniformity of the luminance distribution of the virtual object I can be improved.

[0084] Also, according to the configuration of the HUD20B, the light emitted from each of the first region 231A to the fifth region 231E of the lens 230 is configured to be incident perpendicularly to the concave mirror 26. According to this configuration, since the light can be uniformly reflected over the entire concave mirror 26, the uniformity of the luminance distribution of the virtual object I can be further improved.

[0085] Also, according to the configuration of the HUD20B, a predetermined image (virtual object I) is formed in a horizontally long rectangular shape, and among the first region 231A to the fifth region 231E of the lens 230 which are a plurality of convex portions arranged in parallel, the shape of the region that emits light for forming the center portion of the predetermined image is made different from the shape of the region that emits light for forming the end portion of the predetermined image. According to this configuration, the light for forming the end portion of the predetermined image can also be incident on the concave mirror 26 in a state close to perpendicular, and the uniformity of the luminance distribution of the virtual object I can be further improved.

[0086] As described above, the embodiments of the present invention have been explained, but it goes without saying that the technical scope of the present invention should not be construed in a limited manner by the explanation of this embodiment. This embodiment is merely an example, and it is understood by those skilled in the art that various modifications of the embodiments are possible within the scope of the invention described in the claims. The technical scope of the present invention should be determined based on the scope of the invention described in the claims and its equivalent scope.

[0087] In the above embodiment, the light emitted from the image generation unit 24 (24A, 24B) is configured to be reflected by the concave mirror 26 and irradiated onto the windshield 18, but it is not limited to this. For example, the light reflected by the concave mirror 26 may be irradiated onto a combiner (not shown) provided inside the windshield 18. The combiner is composed of a transmissive member such as a transparent plastic disk, for example. A part of the light irradiated from the image generation unit 24 of the HUD main body 21 onto the combiner is reflected toward the occupant's viewpoint E in the same manner as when the windshield 18 is irradiated with light.

[0088] In addition, in the above-described embodiment, the case where the HUD is mounted on an automobile has been described, but the present invention is not limited thereto. For example, the HUD may be mounted on a motorcycle, a railway vehicle, an aircraft, or the like.

[0089] In addition, in the above-described embodiment, the driving modes of the vehicle have been described as including a fully automatic driving mode, a highly automated driving mode, a driving assistance mode, and a manual driving mode. However, the driving modes of the vehicle should not be limited to these four modes. The driving modes of the vehicle may include at least one of these four modes. For example, only one of the driving modes of the vehicle may be executable.

[0090] In addition, the classification and display form of the driving modes of the vehicle may be appropriately changed in accordance with the laws or regulations related to autonomous driving in each country. Similarly, the definitions of the "fully automatic driving mode", "highly automated driving mode", and "driving assistance mode" described in the description of the present embodiment are merely examples, and these definitions may be appropriately changed in accordance with the laws or regulations related to autonomous driving in each country.

[0091] This application is based on Japanese Patent Application No. 2020-204214 filed on December 9, 2020, the content of which is incorporated herein by reference.

Claims

1. A head-up display configured to display a predetermined image, comprising: an image generation unit that emits light for generating the predetermined image; a mirror that reflects the light so that the light emitted by the image generation unit is irradiated onto a transmission member; The image generation unit includes: a plurality of light sources; an optical member including a plurality of convex portions that transmit light from each of the plurality of light sources; a liquid crystal unit that generates an original image for forming the predetermined image by the light emitted from the optical member; the plurality of light sources are arranged in a curved shape when viewed from the liquid crystal unit side, and the plurality of convex portions are arranged in a curved shape when viewed from the liquid crystal unit side; the predetermined image is formed in a landscape rectangular shape, and the distortion degree of an end region of the predetermined image is larger than that of a center region of the predetermined image; a head-up display that varies the shapes of the convex portions arranged corresponding to the center region and the convex portions arranged corresponding to the end region among the plurality of convex portions according to a difference between the distortion degree of the center region and the distortion degree of the end region.

2. A head-up display configured to display a predetermined image, comprising: an image generation unit that emits light for generating the predetermined image; a mirror that reflects the light so that the light emitted by the image generation unit is irradiated onto a transmission member; The image generation unit includes: a plurality of light sources; at least a single optical member that transmits light from each of the plurality of light sources and emits the light; the single optical member has a plurality of convex portions arranged in parallel along a parallel direction of the plurality of light sources so as to emit the light from each of the plurality of light sources; the plurality of light sources are arranged such that a pitch of the plurality of light sources is shorter than a pitch of each vertex of the plurality of convex portions; a head-up display configured such that the light emitted from each of the plurality of convex portions is incident perpendicularly on the mirror.

3. A head-up display configured to display a predetermined image, comprising: an image generation unit that emits light for generating the predetermined image; a mirror that reflects the light so that the light emitted by the image generation unit is irradiated onto a transmission member; The image generation unit includes: a plurality of light sources; at least including a single optical member that transmits light from each of the plurality of light sources and emits the light; the single optical member has a plurality of convex portions arranged in parallel along the parallel direction of the plurality of light sources so as to emit the light from each of the plurality of light sources; the plurality of light sources are arranged such that the pitch of the plurality of light sources is shorter than the pitch of each vertex of the plurality of convex portions; the predetermined image is formed in a landscape rectangular shape; a head-up display that makes the shapes of the convex portions that emit light for forming the central region of the predetermined image and the convex portions that emit light for forming the end region of the predetermined image different among the plurality of convex portions arranged in parallel.

Images