Head-up display device and vehicle

Abstract

The embodiment of the invention provides a head-up display device and a vehicle. The head-up display device comprises an image display unit, an adjusting assembly, a reflecting mirror assembly and a reflecting panel which are sequentially arranged in the projection light propagation direction. Wherein the image display unit can generate at least two beams of projection light rays which do not coincide with each other in the propagation direction of the projection light rays; the adjusting assembly comprises at least two diffusion sheets, the at least two diffusion sheets are arranged in the propagation direction of the projection light rays and are arranged in a staggered mode in the propagation direction of the projection light rays, and each beam of projection light rays is projected to the corresponding diffusion sheet; the reflector assembly is used for reflecting the projection light from the adjusting assembly to the reflection panel so as to form at least two virtual images in front of the reflection panel, wherein the virtual images are located at different depths of field and staggered up and down along the same visual axis.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of vehicle-mounted display technology, and more specifically, relate to a head-up display device and a vehicle. Background Art

[0002] With the continuous development of automobile technology, head-up display devices (also known as vehicle-mounted HUD systems) have become one of the important configurations in modern cars. Head-up display devices can project driving information directly onto the windshield to form a virtual image, so that the driver does not need to look down at the dashboard, thereby improving driving safety. However, most existing head-up display devices can only display images of a single focal plane, which cannot meet the driver's needs for obtaining information at different distances at the same time. Summary of the invention

[0003] The purpose of this application is to provide a new technical solution for a head-up display device and a vehicle.

[0004] In a first aspect, the present application provides a head-up display device, the head-up display device comprising:

[0005] An image display unit capable of generating at least two mutually non-overlapping projection light beams in the propagation direction of the projection light beam;

[0006] an adjusting component, comprising at least two diffusers, wherein the at least two diffusers are arranged in a propagation direction of the projection light and are staggered in the propagation direction of the projection light, and each beam of the projection light is projected onto a corresponding diffuser; and

[0007] A reflector assembly and a reflective panel, wherein the reflector assembly is used to reflect the projection light from the adjustment assembly to the reflective panel to form at least two virtual images in front of the reflective panel that are located at different depths of field and are displaced up and down along the same visual axis.

[0008] Optionally, the image display unit is capable of projecting at least one projection image plane;

[0009] The at least two diffusion sheets are both located within the depth of field of the image display unit and are distributed around the projection image plane, or are arranged in a one-to-one correspondence with the projection image plane.

[0010] Optionally, the image display unit includes an image source and a projection lens;

[0011] The image source emits a first projection light and a second projection light, and projects a single projection image plane through the projection lens;

[0012] The adjustment component includes a first diffuser and a second diffuser. The first diffuser and the second diffuser are both located within the depth of field of the image display unit and are distributed on the front and rear sides of the projection image plane.

[0013] Optionally, the first diffuser is located at the rear side of the projection image plane and close to the image display unit, and the first diffuser is used to receive the first projection light to form a distant virtual image in human eyes;

[0014] The second projection light is located in front of the projection image plane and away from the image display unit. The second projection light is used to receive the second projection light to form a near-view virtual image in the human eye. The distant virtual image and the near-view virtual image are staggered up and down in the visual axis direction of the human eye.

[0015] Optionally, the image display unit can project two projection image planes within the depth of field, one of which is close to the image display unit and the other is far from the image display unit;

[0016] The adjustment component includes a first diffusion sheet and a second diffusion sheet, and the first diffusion sheet and the second diffusion sheet are respectively arranged at the two projection image planes.

[0017] Optionally, the image display unit includes an image source, a projection lens, and a light-transmitting flat plate located between the image source and the projection lens;

[0018] The light-transmitting plate can cover a part of the image source, so that a part of the light emitted from the image source is projected to the projection lens after passing through the light-transmitting plate, and another part of the light is directly projected to the projection lens, so that the image display unit can project two projection image planes within the depth of field.

[0019] Optionally, the image source emits a first projection light and a second projection light;

[0020] The light-transmitting plate can cover the area where the image source emits the first projection light, so that the first projection light and the second projection light can form two optical path differences for imaging at different distances.

[0021] Optionally, the first diffuser is disposed near a projection image plane of the image display unit, and the first diffuser is used to receive the first projection light to form a distant virtual image in human eyes;

[0022] The second diffuser is arranged at a projection image plane away from the image display unit, and the second projection light is used to receive the second projection light to form a near-view virtual image in the human eye, and the distant virtual image and the near-view virtual image are staggered up and down in the visual axis direction of the human eye.

[0023] Optionally, the refractive index of the light-transmitting flat plate is greater than the refractive index of air.

[0024] Optionally, the light-transmitting plate includes any one of a glass plate, a resin plate, an optical crystal plate and a silicone plate.

[0025] Optionally, the reflector assembly comprises at least one reflector.

[0026] Optionally, the reflective panel is a front windshield of the vehicle.

[0027] In a second aspect, the present application provides a vehicle, the vehicle comprising:

[0028] The head-up display device according to the first aspect;

[0029] Wherein, the reflective panel is the front windshield of the vehicle.

[0030] The beneficial effects of this application are:

[0031] The embodiment of the present application provides a head-up display device, which relates to a different-axis dual-focal plane HUD design. The optical architecture provided by the present application is intended to simplify the optical path design of the head-up display device, reduce the structural complexity and manufacturing difficulty, and reduce the volume of the entire device, thereby improving the integration. The head-up display device of the present application effectively reduces the crosstalk of the near and far projection optical paths by adjusting the misalignment of multiple diffusers in the assembly, improves the clarity and stability of the imaging, and the head-up display device can form at least two high-quality virtual images that are misaligned up and down on the same visual axis, thereby providing the driver with clear information display. In short, the present application has achieved significant beneficial effects in simplifying the design, reducing the volume, optimizing the imaging quality, and improving driving safety and comfort.

[0032] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0034] Figure 1 A structural diagram of a head-up display device provided in an embodiment of the present application;

[0035] Figure 2 One of the structural diagrams of the image display unit of the head-up display device provided in an embodiment of the present application;

[0036] Figure 3 The second structural diagram of the image display unit of the head-up display device provided in the embodiment of the present application;

[0037] Figure 4 This is a schematic diagram of the structure of a traditional vehicle-mounted HUD system.

[0038] Description of reference numerals:

[0039] 1a, distant virtual image; 1b, near virtual image;

[0040] 2. Reflective panel;

[0041] 3. Human eyes;

[0042] 4. Reflector assembly; 41. First reflector; 42. Second reflector;

[0043] 5. Image display unit; 51. Image source; 52. Projection lens; 53. Light-transmitting plate; 5a. First projection light; 5b. Second projection light;

[0044] 6. Adjustment component; 61. First diffuser; 62. Second diffuser. DETAILED DESCRIPTION

[0045] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0046] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0047] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0048] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0049] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0050] The head-up display device and the vehicle provided in the embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0051] The head-up display device can realize the combination of real image and virtual image. For example, when applied to a car, the head-up display device projects a virtual image several meters in front of the car windshield with the light emitted by the image display unit. The virtual image can display various information such as vehicle speed and fuel gauge. The driver no longer needs to look down at the dashboard, and can see the road conditions outside through the windshield (real image), thereby greatly reducing the driving accident rate. With the diversification of user needs, it is required to present virtual images in different positions. However, the adjustment of the virtual image position may affect the clarity of the image.

[0052] Conventional head-up display devices cannot present clear images at different locations simultaneously.

[0053] To this end, an embodiment of the present application provides a head-up display device.

[0054] According to an embodiment of the present application, a head-up display device is provided. Figure 1 The head-up display device includes: an image display unit 5, an adjustment component 6, a reflector component 4 and a reflective panel 2, which are arranged in sequence along the propagation direction of the projection light; the image display unit 5 can generate at least two beams of projection light that do not overlap each other in the propagation direction of the projection light; the adjustment component 6 includes at least two diffusers, and the at least two diffusers are both arranged in the propagation direction of the projection light and are staggered in the propagation direction of the projection light, and each beam of the projection light is projected to a corresponding diffuser; the reflector component 4 is used to reflect the projection light from the adjustment component 6 to the reflective panel 2, so as to form at least two virtual images at different depths of field and staggered up and down along the same visual axis in front of the reflective panel 2.

[0055] In the head-up display device of the embodiment of the present application, the main components and their functions are as follows.

[0056] Image display unit 5: The image display unit 5 is one of the core optical components of the head-up display device of the present application, which is responsible for generating projection light and can project at least one projection image plane. The image display unit 5 contains a variety of information that needs to be displayed to the driver, such as vehicle speed, fuel gauge, etc. The performance of the image display unit 5 directly affects the imaging quality of the entire head-up display device and the clarity of information display.

[0057] Adjustment component 6: The adjustment component 6 is a key component for realizing the off-axis dual-focal plane projection effect in the present application. The off-axis here means that all virtual images formed are not on the same visual axis of the human eye 3, that is, the virtual images are staggered, see Figure 1 The distant virtual image 1a and the near virtual image 1b are shown in FIG.

[0058] The adjustment component 6 in the present application includes at least two diffusers (see Figure 1 and Figure 2 The first diffuser 61 and the second diffuser 62 are arranged in the projection light propagation direction and are staggered perpendicular to the projection light propagation direction. By staggering different diffusers, the path and diffusion degree of the projection light can be adjusted, so as to realize vertically staggered virtual images at different distances. The design and optimization of the adjustment component 6 plays an important role in improving the imaging quality and reducing the crosstalk of the optical path.

[0059] Reflector assembly 4: In the present application, the reflector assembly 4 is mainly responsible for reflecting the projection light from the adjustment assembly 6 to the reflective panel 2 arranged at the rear.

[0060] It should be noted that when the head-up display device is applied to a vehicle, such as a car, it is a vehicle-mounted HUD device, and the reflective panel 2 is the front windshield of the vehicle, see Figure 1 shown.

[0061] In the technical solution provided in the present application, the reflector assembly 4 may include only one or two reflectors, and the projection light emitted by the adjustment assembly 6 can be accurately reflected to the reflective panel 2 (the windshield of the vehicle) and finally form two clear virtual images of different distances and staggered in the human eye 3. The design of the reflector assembly 4 will directly affect the volume of the entire head-up display device. In the present application, the number of reflectors in the reflector assembly can be reduced, so the volume of the reflector assembly can be reduced.

[0062] The head-up display device provided in the embodiment of the present application adopts an off-axis dual-focal plane optical path solution, generates at least one projection image plane through the image display unit 5, and uses at least two diffusers in the adjustment component 6 to be staggered in a direction perpendicular to the propagation direction of the projection light. This design greatly simplifies the optical path design of the head-up display device, compared with the traditional off-axis HUD system that requires a complex structure of three reflectors (7a, 7b and 7c), see Figure 4 The technical solution of the present application can effectively reduce the number of light-transmitting plates, thereby reducing the structural complexity and manufacturing difficulty of the entire head-up display device.

[0063] Regarding the reflective panel 2, in the present application, it is used to reflect the projection light from the reflector assembly again, so as to form virtual images with different depths of field and staggered in the human eye. In application, the reflective panel 2 is, for example, the front windshield of a vehicle.

[0064] The front windshield of the vehicle plays an important role as an imaging medium in the vehicle-mounted head-up display device. Specifically, if the head-up display device of the present application is used in a car, the projection light reflected by the reflector assembly 4 will form staggered virtual images with different depths of field in front of the front windshield of the vehicle, see Figure 1 The distant virtual image 1a and the near virtual image 1b.

[0065] In the head-up display device provided in the embodiment of the present application, the image display unit 5, the adjustment component 6, the reflector component 4, the reflective panel 2 (windshield) and other optical components work together to achieve the projection effect of off-axis dual focal planes, which can provide the driver with clear and intuitive information display. Each light-transmitting flat panel plays an indispensable role and together constitutes the core function of the head-up display device.

[0066] It can be seen that the head-up display device provided in the embodiment of the present application achieves the projection effect of off-axis dual focal planes by introducing the adjustment component 6, which includes at least two diffusers arranged in a staggered manner perpendicular to the propagation direction of the projection light. This design breaks the complex optical path of the traditional off-axis HUD system that must use three reflectors (such as 7a, 7b and 7c), see Figure 4 , effectively simplifying the device structure and reducing the difficulty and cost of optical design.

[0067] In the present application, the image display unit 5 is configured to generate at least two non-overlapping projection light beams perpendicular to the propagation direction of the projection light beam, and each projection light beam is projected onto a corresponding diffuser. Moreover, by staggering at least two diffusers in the adjustment component 6, the path and diffusion degree of the projection light beam can be adjusted, so that the projection light beam reflected from the reflector component 4 to the reflective panel 2 can form at least two virtual images staggered up and down at different distances. These virtual images are staggered along the visual axis of the human eye 3, and the imaging quality is high, which can provide the driver with clear and intuitive information display.

[0068] Traditional off-axis dual-focal plane HUD systems use complex reflector design and optical path arrangement to achieve virtual image projection at different distances and positions. This method not only makes the optical architecture design complex and bulky, but also is very likely to cause crosstalk between optical paths, affecting display effects and driving safety.

[0069] The head-up display device of the embodiment of the present application adopts an image display unit 5 that can generate at least two beams of projection light that do not overlap each other in a direction perpendicular to the propagation direction of the projection light. This design means that the image display unit 5 can generate two or more beams of projection light that are separated from each other in space, and each beam of projection light is correspondingly projected onto a diffuser (Diffuser), which is mainly used to diffuse and deflect the corresponding light received to ensure that the light can be correctly reflected by the subsequent reflector assembly 4 and the reflective panel 2 (windshield) and finally form a clear virtual image in front of the human eye 3.

[0070] According to this example of the present application, the image display unit 5 directly generates separate projection light, which reduces the reliance on multiple reflectors, thereby simplifying the optical path design of the HUD system. Since the number of reflectors used is reduced, the volume of the entire head-up display device can be further reduced, which is more suitable for the compact requirements of the interior space of modern cars.

[0071] It should be emphasized that in the present application, since the projection lights are separated in space, the crosstalk between them is greatly reduced, thereby improving the display effect and clarity.

[0072] The design in this application allows for easier adjustment of the direction and position of each beam of projection light to achieve virtual image projection at different distances and positions, meeting diverse driving information display needs.

[0073] The embodiment of the present application provides a head-up display device, which relates to a different-axis dual-focal plane HUD design. The optical architecture provided by the present application is intended to simplify the optical path design of the head-up display device, reduce the structural complexity and manufacturing difficulty, and reduce the volume of the entire device, thereby improving the integration. The head-up display device of the present application effectively reduces the crosstalk of the near and far projection optical paths by adjusting the misalignment of multiple diffusers in the assembly, improves the clarity and stability of the imaging, and the head-up display device can form at least two high-quality virtual images that are misaligned up and down on the same visual axis, thereby providing the driver with clear information display. In short, the present application has achieved significant beneficial effects in simplifying the design, reducing the volume, optimizing the imaging quality, and improving driving safety and comfort.

[0074] In some examples of the present application, the image display unit 5 is capable of projecting at least one projection image plane; the at least two diffusers are located within the depth of field of the image display unit 5, and are distributed around the projection image plane, or are arranged in a one-to-one correspondence with the projection image plane.

[0075] This example of the present application describes two designs of a head-up display device.

[0076] The first type: at least two diffusion sheets are distributed around the projection image plane.

[0077] See also Figure 2 When the image display unit 5 can only project one projection image plane, at least two diffusers in the adjustment component 6 can be distributed at appropriate positions around the projection image plane. At this time, the diffusers in the adjustment component 6 can realize the projection light from the image display unit 5 to form a virtual image within different depths of field.

[0078] It should be noted that, in the first design described above, each of the diffusion sheets and the projection image plane has a certain amount of misalignment on the projection light propagation path.

[0079] The second method is to adjust the image display unit 5 so that the image display unit 5 can directly project two or more projection image planes, and the diffusion sheet and the projection image plane are arranged in a one-to-one correspondence. Figure 3 .

[0080] When each projection image surface has a corresponding diffuser, the distribution and scattering degree of each projection light beam can be controlled more accurately, and the image quality can be optimized, such as improving the brightness uniformity of the image.

[0081] In some examples of this application, see Figure 2 The image display unit 5 includes an image source 51 and a projection lens 52; the image source 51 emits a first projection light 5a and a second projection light 5b, and projects a single projection image plane through the projection lens 52; the adjustment component 6 includes a first diffuser 61 and a second diffuser 62, the first diffuser 61 and the second diffuser 62 are both located within the depth of field of the image display unit 5, and are distributed on the front and rear sides of the projection image plane.

[0082] See also Figure 1 and Figure 2 , the image display unit 5 can generate a first projection light 5a and a second projection light 5b, and can project a projection image plane. On this basis, the adjustment component 6 is designed to include a first diffuser 61 and a second diffuser 62. The first diffuser 61 and the second diffuser 62 are to be located within the depth of field of the image display unit 5 and are distributed on opposite sides of the projection image plane, see Figure 2 .

[0083] The traditional off-axis dual-focal plane HUD system relies on complex mirror components to achieve virtual image projection at different distances and positions, which not only increases the complexity and volume of the entire system, but also may cause crosstalk between optical paths. In addition, the traditional HUD system can often only form a clear virtual image at a fixed position, which is difficult to meet the diverse driving information display needs.

[0084] In this example of the present application, by introducing an image display unit 5 capable of generating a first projection light and a second projection light, and a first diffuser 61 and a second diffuser 62 located within the depth of field of the image display unit 5 and distributed on the front and rear sides of the projection image, effective adjustment and diffusion of the projection light is achieved.

[0085] It should be noted that the projection image plane is the real image formed by the image display unit 5, and the two diffusers introduced in the present application are designed to be located within the depth of field of the image display unit 5, which means that the imaging quality requirements can be met wherever they are located, and the image quality will not be significantly reduced due to a slight change in position relative to the projection image plane.

[0086] Since the two diffusion sheets, namely the first diffusion sheet 61 and the second diffusion sheet 62, are both located within the depth of field of the image display unit 5, they can effectively diffuse and adjust the projection light, thereby ensuring that the virtual image formed in front of the human eye 3 has clear image quality.

[0087] By adjusting the position and angle of the two diffusers in the adjustment component 6, the direction and position of the projection light can be flexibly changed, thereby realizing virtual image projection at different distances and positions. This flexibility enables the head-up display device to better adapt to the diverse driving information display requirements.

[0088] Compared with the traditional off-axis dual-focal plane HUD system, the head-up display device of the present application reduces the number of reflectors used in the reflector assembly, thereby simplifying the optical path design and reducing the complexity of the device.

[0089] Since the projection light is effectively dispersed and adjusted after passing through different diffusers, the crosstalk between them is greatly reduced, thereby improving the display effect and clarity.

[0090] In summary, this example of the present application achieves significant improvements in imaging quality, simplification of optical path design, volume reduction, and crosstalk reduction of the off-axis dual-focal-plane head-up display device by introducing two diffusers located within the depth of field of the image display unit 5 and distributed on the front and rear sides of the projection image surface.

[0091] In some examples of this application, see Figure 1The first diffuser 61 is located at the rear side of the projection image plane and close to the image display unit 5, and the first diffuser 61 is used to receive the first projection light 5a to realize the formation of a distant virtual image 1a in the human eye 3. The second projection light 5b is located in front of the projection image plane and away from the image display unit 5, and the second projection light 5b is used to receive the second projection light 5b to realize the formation of a near virtual image 1b in the human eye 3, and the distant virtual image 1a and the near virtual image 1b are staggered in the visual axis direction of the human eye 3.

[0092] Please continue to see Figure 1 In this example of the present application, by utilizing the two projection light beams generated by the image display unit 5, such as the first projection light beam 5a and the second projection light beam 5b, and the two diffusers such as the first diffuser 61 and the second diffuser 62 located on the front and rear sides of the projection image, a distant virtual image 1a and a near virtual image 1b that are staggered in the visual axis direction of the human eye 3 are realized.

[0093] Specifically, the first projection light 5a is projected to the first diffuser 61 behind the projection image plane, and after being diffused and deflected by the first diffuser 61, a distant virtual image 1a is formed in the human eye 3; the second projection light 5b is projected to the second diffuser 62 in front of the projection image plane, and after being diffused and deflected, a near virtual image 1b is formed in the human eye 3. Since the two diffusers are respectively located at the front and rear sides of the projection image plane and are both located within the depth of field of the image display unit 5, they can effectively guide the projection light to different positions, thereby forming a virtual image with vertical offset distribution in the human eye 3, see Figure 1 The distant virtual image 1a and the near virtual image 1b are shown in FIG.

[0094] According to this example of the present application, see Figure 1 By simultaneously forming a distant view virtual image 1a and a near view virtual image 1b in the same head-up display device, the diversity of information display is significantly enhanced. This enables the driver to view various information such as vehicle speed and fuel gauge at different distances, improving the convenience and safety of driving.

[0095] Since the two diffusion sheets are both located within the depth of field of the image display unit 5, they can ensure that the projection light still maintains good imaging quality after being diffused and deflected, which ensures that the virtual image in the human eye 3 has clear image quality.

[0096] Compared with the traditional off-axis dual-focal plane HUD system, the technical solution in the example of the present application reduces the number of reflectors used, thereby simplifying the optical path design and reducing the complexity of the head-up display device. This not only reduces the size and weight of the head-up display device, but also improves its reliability and stability.

[0097] Since the projected light is effectively dispersed and adjusted after passing through the diffuser, the crosstalk between them is greatly reduced. This ensures that the driver will not be disturbed by other light when viewing the virtual image, thereby improving driving safety and comfort.

[0098] By adjusting the position and angle of the two diffusers, the direction and position of the projection light can be flexibly changed, thereby realizing virtual image projection at different distances and positions. This flexibility enables the head-up display device of the present application to better adapt to different driving environments and needs.

[0099] In some examples of this application, see Figure 1 and Figure 3 The image display unit 5 can project two projection image planes within the depth of field, one of which is close to the image display unit 7, and the other is far away from the image display unit 7; the adjustment component 6 includes a first diffuser 61 and a second diffuser 62, and the first diffuser 61 and the second diffuser 62 are respectively arranged at the two projection image planes.

[0100] In this example of the present application, at least two projection light beams such as the first projection light beam 5a and the second projection light beam 5b are simultaneously generated by the image display unit 5, and two projection image planes (i.e., two real images) can be projected. The two projection image planes correspond to the virtual image positions of the distant view and the near view, respectively. In order to achieve this function, the adjustment component 6 is designed to include two diffusers: a first diffuser 61 and a second diffuser 62, and they are respectively arranged at the two projection image planes.

[0101] In some examples of this application, see Figure 3 The image display unit 5 includes an image source 51, a projection lens 52 and a light-transmitting plate 53 located between the image source 51 and the projection lens 52; the light-transmitting plate 53 can cover a part of the image source 51, so that a part of the light emitted from the image source 51 passes through the light-transmitting plate 53 and is projected to the projection lens 52, and another part of the light is directly projected to the projection lens 52, so that the image display unit 5 can project two projection image planes within the depth of field.

[0102] The function of the light-transmitting plate 53 is to cover part of the image source 51, thereby changing the optical path of the light emitted from different positions. For example, when the light emitted by the image source 51 passes through the light-transmitting plate 53, the light in the covered area will continue to propagate after passing through the light-transmitting plate 53, while the light in the uncovered area will directly pass through the light-transmitting plate 53.

[0103] In this example of the present application, with the help of the introduced light-transmitting flat plate 53, different beams of projection light can form virtual images with different depths of field.

[0104] In some examples of this application, see Figure 3 , the image source 51 emits a first projection light 5a and a second projection light 5b; the light-transmitting plate 53 can cover the area where the image source 51 emits the first projection light 5a, so that the first projection light 5a and the second projection light 5b can form two optical path differences for imaging at different distances.

[0105] Specifically, see Figure 1 and Figure 3 , the two projection light beams generated by the image display unit 5 are projected onto two projection image planes respectively, wherein the first projection light beam 5a is projected onto the first projection image plane (corresponding to the distant virtual image position) and is received and diffused by the first diffuser 61, and then forms a distant virtual image 1a in the human eye 3 through the subsequent optical path (such as the reflector assembly 4, the reflective panel 2, etc.). Similarly, the second projection light beam is projected onto the second projection image plane (corresponding to the near virtual image position) and is received and diffused by the second diffuser 62, and then forms a near virtual image 1b in the human eye 3. Since the two diffusers are respectively located at the two projection image planes, they can effectively guide the projection light beams to different positions, thereby forming a far virtual image 1a and a near virtual image 1b with staggered distribution in the human eye 3.

[0106] See also Figure 3 Due to the existence of the light-transmitting plate 53, the first projection light 5a emitted from the image source 51 needs to pass through the light-transmitting plate 53 before being projected to the projection lens 52, while the second projection light 5b is directly projected to the projection lens 52. In this way, the first projection light 5a and the second projection light 5b form different optical path differences after passing through the projection lens 52. When the first projection light 5a is projected to the first diffuser 61, and the second projection light 5b is projected to the second diffuser 62, this optical path difference causes the two light beams to form virtual images at different depths of field.

[0107] According to this example of the present application, by controlling the position and size of the light-transmitting flat plate 53, the optical path difference between the first projection light 5a and the second projection light 5b can be adjusted, thereby ensuring that both virtual images can form clear images at different distances. This design helps to improve the imaging quality of the head-up display device, allowing the driver to obtain vehicle information more accurately.

[0108] In some examples of this application, see Figure 1 and Figure 3The first diffuser 61 is arranged near the projection image plane of the image display unit 5, and the first diffuser 61 is used to receive the first projection light 5a to form a distant virtual image 1a in the human eye 3. The second diffuser 62 is arranged far away from the projection image plane of the image display unit 5, and the second projection light 5b is used to receive the second projection light 5b to form a near virtual image 1b in the human eye 3, and the distant virtual image (1a) and the near virtual image 1b are staggered in the visual axis direction of the human eye 3.

[0109] The projection light path provided in this example according to this application is as follows:

[0110] After passing through the projection lens 52, the second projection light 5b is directly projected onto the second diffuser 62, and finally forms a near-view virtual image 1b in the human eye 3. The first projection light 5a is more complicated. It first passes through the light-transmitting plate 53, then passes through the projection lens 52, and finally projects onto the first diffuser 61, and finally forms a far-view virtual image 1a in the human eye 3, see Figure 1 and Figure 3 .

[0111] The formed distant virtual image 1a and near virtual image 1b are staggered in the visual axis direction, which means that they are not only located at different distances, but also offset in the vertical direction. This staggered distribution helps the driver to observe the information displayed on the head-up display device more clearly and intuitively.

[0112] More importantly, see Figure 1 and Figure 3 The design of the head-up display device shown can improve the image quality. Since the two diffusers are located at the positions of their respective projection image planes, they can ensure that the projection light maintains good image quality after diffusion. This ensures that the virtual image in the human eye 3 has clear image quality and accurate position.

[0113] In some examples of the present application, the refractive index of the light-transmitting plate 53 is greater than the refractive index of air.

[0114] The refractive index of the light-transmitting plate 53 is greater than that of air, which means that when light is emitted from the image source 51 and passes through the light-transmitting plate 53, the light will be refracted, thereby changing its propagation direction. This refraction effect increases the optical path of some light, while the optical path of other light remains unchanged (or is relatively shorter).

[0115] In some examples of the present application, the light-transmitting plate 53 includes any one of a glass plate, a resin plate, an optical crystal plate, and a silicone plate.

[0116] In the example of the present application, the light-transmitting plate 53 can be any one of a glass plate, a resin plate, an optical crystal plate and a silicone plate. These materials all have the property that the refractive index is greater than that of air. The selection of different materials may affect the light transmittance, heat resistance, corrosion resistance and cost of the light-transmitting plate.

[0117] In some examples of this application, see Figure 1 , the reflector assembly includes at least one reflector.

[0118] The head-up display device of the embodiment of the present application can reduce the number of reflectors used in the reflector assembly based on the design of the image display unit 5 with at least two diffusers. Compared with the traditional design, the present application reduces the number and complexity of reflectors (reflectors 7a, 7b and 7c), and reduces the difficulty of optical path design. Figure 4 .

[0119] It should be noted that the simplification of the reflector assembly 4 can directly lead to a reduction in the volume of the entire head-up display device. In addition, by optimizing the design of the reflector assembly, the manufacturing and assembly costs can be reduced.

[0120] The head-up display device of the embodiment of the present application includes a reflector assembly 4, and the reflector assembly 4 can use only one or two reflectors, which greatly reduces the number of reflectors used.

[0121] Specifically, see Figure 1 and Figure 2 The reflector assembly 4 of the present application includes a first reflector 41 and a second reflector 42 , wherein the first reflector 41 is located on the light emitting path of the adjustment assembly 6 , and the second reflector 42 is located between the reflection path of the first reflector 41 and the reflection panel 2 .

[0122] In some examples of this application, see Figure 1 , the reflective panel 2 is the front windshield of the vehicle.

[0123] In addition, the reflector assembly of the present application can choose to use a curved reflector assembly.

[0124] In the present application, the image source 51 in the image display unit 5 can be a transmission type image source, such as TFT, etc. The image display unit 5 can also be a reflective image source, such as DMD or LCOS. The image display unit 5 can also be a self-luminous image source, such as LED, OLED or Micro LED, etc.

[0125] The head-up display device provided in the embodiment of the present application can bring the following technical effects:

[0126] (1) Enhanced information display diversity: By simultaneously forming a distant virtual image 1a and a near virtual image 1b on the same head-up display device, the present application significantly enhances the diversity of information display. This enables the driver to view various information such as vehicle speed and fuel gauge at different distances, thereby improving driving safety.

[0127] (2) Simplified optical path design: Compared with the traditional off-axis dual-focal plane HUD system, the solution of the present application can appropriately reduce the number of reflectors used, thereby simplifying the optical path design. This not only reduces the size and weight of the head-up display device, but also helps to reduce production costs.

[0128] (3) Reduced crosstalk: Since the two diffusers are located at the two projection image planes, they can effectively disperse the projection light in different directions, thereby reducing the crosstalk problem between different light paths. This ensures that the driver will not be disturbed by other light when viewing the virtual image, improving driving comfort and safety.

[0129] According to another embodiment of the present application, a vehicle is further provided, the vehicle comprising the head-up display device as described above; wherein the reflective panel 2 is a front windshield of the vehicle.

[0130] The specific implementation of the vehicle in the embodiment of the present application can refer to the above-mentioned embodiments of the head-up display device, so it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0131] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0132] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A head-up display device, characterized in that: Including the following arranged in sequence along the direction of projection light propagation: An image display unit (5) capable of generating at least two mutually non-overlapping projection light beams in the propagation direction of the projection light beam; An adjustment component (6) comprises at least two diffusers, wherein the at least two diffusers are arranged in the propagation direction of the projection light and are staggered in the propagation direction of the projection light, and each beam of the projection light is projected onto a corresponding diffuser; and A reflector assembly (4) and a reflective panel (2), wherein the reflector assembly (4) is used to reflect the projection light from the adjustment assembly (6) to the reflective panel (2), so as to form at least two virtual images in front of the reflective panel (2) that are located at different depths of field and are vertically displaced along the same visual axis.

2. The head-up display device according to claim 1, characterized in that: The image display unit (5) is capable of projecting at least one projection image plane; The at least two diffusion sheets are both located within the depth of field of the image display unit (5), and are distributed around the projection image plane, or are arranged in a one-to-one correspondence with the projection image plane.

3. The head-up display device according to claim 2, characterized in that: The image display unit (5) comprises an image source (51) and a projection lens (52); The image source (51) emits a first projection light (5a) and a second projection light (5b), and projects a single projection image plane through the projection lens (52); The adjustment component (6) comprises a first diffuser (61) and a second diffuser (62), wherein the first diffuser (61) and the second diffuser (62) are both located within the depth of field of the image display unit (5) and are distributed on the front and rear sides of the projection image plane.

4. The head-up display device according to claim 3, characterized in that: The first diffuser (61) is located at the rear side of the projection image plane and close to the image display unit (5), and the first diffuser (61) is used to receive the first projection light (5a) to form a distant virtual image (1a) in the human eye (3); The second projection light (5b) is located in front of the projection image plane and away from the image display unit (5); the second projection light (5b) is used to receive the second projection light (5b) to realize the formation of a near-field virtual image (1b) in the human eye (3); the far-field virtual image (1a) and the near-field virtual image (1b) are distributed in an up-and-down dislocation in the visual axis direction of the human eye (3).

5. The head-up display device according to claim 2, characterized in that: The image display unit (5) is capable of projecting two projection image planes within the depth of field, one of the projection image planes being close to the image display unit (7) and the other of the projection image planes being far from the image display unit (7); The adjustment component (6) comprises a first diffusion sheet (61) and a second diffusion sheet (62), wherein the first diffusion sheet (61) and the second diffusion sheet (62) are respectively arranged at the two projection image planes.

6. The head-up display device according to claim 5, characterized in that: The image display unit (5) comprises an image source (51), a projection lens (52), and a light-transmitting plate (53) located between the image source (51) and the projection lens (52); The light-transmitting plate (53) can cover a partial area of ​​the image source (51), so that a portion of the light emitted from the image source (51) passes through the light-transmitting plate (53) and is projected onto the projection lens (52), while another portion of the light is directly projected onto the projection lens (52), so that the image display unit (5) can project two projection image planes within the depth of field.

7. The head-up display device according to claim 6, characterized in that: The image source (51) emits a first projection light (5a) and a second projection light (5b); The light-transmitting flat plate (53) can cover the area where the image source (51) emits the first projection light (5a), so that the first projection light (5a) and the second projection light (5b) can form two optical path differences for imaging at different distances.

8. The head-up display device according to claim 7, characterized in that: The first diffuser (61) is arranged near the projection image plane of the image display unit (5), and the first diffuser (61) is used to receive the first projection light (5a) to form a distant virtual image (1a) in the human eye (3); The second diffuser (62) is arranged at a projection image plane away from the image display unit (5), and the second projection light (5b) is used to receive the second projection light (5b) to form a near-field virtual image (1b) in the human eye (3), and the far-field virtual image (1a) and the near-field virtual image (1b) are distributed in an up-and-down staggered manner in the visual axis direction of the human eye (3).

9. The head-up display device according to claim 6, characterized in that: The refractive index of the light-transmitting flat plate (53) is greater than the refractive index of air.

10. The head-up display device according to claim 9, characterized in that: The light-transmitting flat plate (53) comprises any one of a glass flat plate, a resin flat plate, an optical crystal flat plate and a silica gel flat plate.

11. The head-up display device according to claim 1, characterized in that: The reflector assembly (4) comprises at least one reflector.

12. The head-up display device according to claim 1, characterized in that: The reflective panel (2) is a front windshield of the vehicle.

13. A vehicle, characterized in that: include: The head-up display device according to any one of claims 1 to 12; Wherein, the reflective panel (2) is a front windshield of the vehicle.

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