Head-up display device

Abstract

The utility model discloses a head-up display device, and relates to the technical field of intelligent driving, in the head-up display device, light beams of images respectively projected by two projection units share two reflection elements to be reflected to a windshield and then are reflected to eyes of a driver through the windshield, virtual images are respectively formed on two focal planes in front of the windshield, and the virtual images are displayed on the two focal planes. In this way, double-focal-plane imaging is achieved, one focal plane can be a near focal plane, a close-shot image is formed and used for displaying information replacing a vehicle instrument, and the other focal plane can be a far focal plane, a long-shot image is formed and used for providing richer and larger-area augmented reality information, so that the far shot and the near shot are combined, and the imaging effect is improved. The driving safety and the driving experience are better improved, and the problem that an existing HUD generally can only realize virtual image projection in a single distance is solved; and transmission light paths for imaging of different focal planes share the two reflecting elements, so that the number of the reflecting elements is reduced, the installation and adjustment difficulty and the manufacturing cost are reduced, and the equipment size is also reduced to a certain extent.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent driving, and in particular to a head-up display device. BACKGROUND

[0002] The head-up display device (HUD) has been widely applied in various aircrafts and various vehicles at present. The main function of the HUD is to project important information (such as vehicle speed, road information, fuel quantity and water temperature, etc.) in vehicle driving directly on the windshield glass in front of the driver, so that the driver can see the important information in vehicle driving without lowering his head, thereby improving the safety and convenience of driving.

[0003] The most common types of HUDs currently include windshield HUD (W-HUD) and augmented reality HUD (AR-HUD). Among them, the AR-HUD can not only display the basic information of the vehicle, but also can combine with the real road information to realize real scene navigation. The navigation picture is intuitive and vivid, which greatly improves the human-computer interaction experience of the driver during driving.

[0004] However, the existing HUDs can usually only realize virtual image projection at a single distance, and the projection distance of the HUD is generally between 7.5 meters and 13 meters. If only one focal plane is displayed, it is difficult to meet the reading demand of the driver for the text type driving information more intuitively, especially in the scene of waiting for a red light. The virtual image in the distance directly hits the front vehicle, and the human-computer interaction experience is also lacking. CONTENT OF THE UTILITY MODEL

[0005] To solve the above technical problems, the present application provides a head-up display device to realize double focal plane imaging and improve the driving experience.

[0006] To achieve the above purpose, the present application provides the following technical solutions:

[0007] A head-up display device comprises:

[0008] A first projection unit is configured to project a light beam of a first image;

[0009] A second projection unit is configured to project a light beam of a second image;

[0010] A first reflection element, a second reflection element and a windshield glass are sequentially arranged along a light path transmission direction;

[0011] The first reflective element is configured to reflect the light beam of the first image projected by the first projection unit to the second reflective element, and to reflect the light beam of the second image projected by the second projection unit to the second reflective element;

[0012] The second reflecting element is configured to reflect the light beam of the first image reflected by the first reflecting element toward the windshield, and to reflect the light beam of the second image reflected by the first reflecting element toward the windshield;

[0013] The windshield is used to reflect the light beam of the first image reflected by the second reflecting element to the driver's eyes, forming a virtual image of the first image located at a first focal plane, and reflect the light beam of the second image reflected by the second reflecting element to the driver's eyes, forming a virtual image of the second image located at a second focal plane, and the first focal plane and the second focal plane do not overlap.

[0014] Optionally, the horizontal distance between the second focal plane and the driver's eyes is greater than the horizontal distance between the first focal plane and the driver's eyes;

[0015] An optical distance of the light beam of the second image from the second projection unit to the driver's eyes is greater than an optical distance of the light beam of the first image from the first projection unit to the driver's eyes.

[0016] Optionally, the windshield includes a first near-focal plane reflection area and a first far-focal plane reflection area, and the first far-focal plane reflection area is higher than the first near-focal plane reflection area;

[0017] The first near-focal-plane reflection area is used to reflect the light beam of the first image reflected by the second reflection element to the driver's eyes, forming a virtual image of the first image located at the first focal plane;

[0018] The first far-focal-plane reflection area is used to reflect the light beam of the second image reflected by the second reflection element to the driver's eyes, forming a virtual image of the second image located on the second focal plane.

[0019] Optionally, the first reflective element and the second reflective element are located below the windshield, the first reflective element and the second reflective element are arranged opposite to each other, and the second reflective element is closer to the windshield than the first reflective element;

[0020] The first projection unit and the second projection unit are located on a side of the second reflective element away from the windshield, and the second projection unit is farther away from the windshield than the first projection unit.

[0021] Optionally, the first reflective element has a concave surface, and the concave surface of the first reflective element is used to reflect the light beam of the first image projected by the first projection unit to the second reflective element, and reflect the light beam of the second image projected by the second projection unit to the second reflective element;

[0022] The second reflecting element has a convex surface, and the convex surface of the second reflecting element is used to reflect the light beam of the first image reflected by the first reflecting element to the windshield, and to reflect the light beam of the second image reflected by the first reflecting element to the windshield.

[0023] Optionally, the concave surface of the first reflective element includes a second near-focal plane reflective area and a second far-focal plane reflective area, and the second near-focal plane reflective area is closer to the windshield than the second far-focal plane reflective area;

[0024] The convex surface of the second reflective element includes a third near-focal plane reflection area and a third far-focal plane reflection area, and the third near-focal plane reflection area is closer to the windshield than the third far-focal plane reflection area;

[0025] The second near-focal-plane reflection area is used to reflect the light beam of the first image projected by the first projection unit to the third near-focal-plane reflection area, and the third near-focal-plane reflection area is used to reflect the light beam of the first image reflected by the second near-focal-plane reflection area to the windshield;

[0026] The second far-focal-plane reflection area is used to reflect the light beam of the second image projected by the second projection unit to the third far-focal-plane reflection area, and the third far-focal-plane reflection area is used to reflect the light beam of the second image reflected by the second far-focal-plane reflection area to the windshield.

[0027] Optionally, both the first reflecting element and the second reflecting element are free-form surface mirrors.

[0028] Optionally, at least one of the first reflecting element and the second reflecting element is adjustable.

[0029] Optionally, the first projection unit includes a first image element and a first diffusion element, the first image element is used to generate a light beam of the first image, and the first diffusion element is used to expand the light beam of the first image generated by the first image element to project the light beam of the first image;

[0030] The second projection unit includes a second image element and a second diffusion element. The second image element is used to generate a light beam of the second image. The second diffusion element is used to expand the light beam of the second image generated by the second image element to project the light beam of the second image.

[0031] Optionally, the horizontal distance between the second focal plane and the driver's eyes is 10m;

[0032] The horizontal distance between the first focal plane and the driver's eyes is 3m.

[0033] Compared with the existing technology, the above technical solution has the following advantages:

[0034] The head-up display device provided in the embodiment of the present application includes a first projection unit and a second projection unit, and a first reflecting element, a second reflecting element and a windshield arranged in sequence along the transmission direction of the optical path, wherein the first projection unit projects a light beam of the first image to the first reflecting element, which is reflected by the first reflecting element and reaches the second reflecting element, and the second reflecting element reflects the light beam of the first image to the windshield, and then the windshield reflects the light beam of the first image to the driver's eyes, forming a virtual image of the first image located at the first focal plane; the second projection unit projects a light beam of the second image to the first reflecting element, which is reflected by the first reflecting element and reaches the second reflecting element, and the second reflecting element reflects the light beam of the second image to the windshield, and then the windshield reflects the light beam of the second image to the driver's eyes, forming a virtual image of the second image located at the second focal plane; the first focal plane and the second focal plane do not overlap; in this way, the first focal plane and the second focal plane can be achieved. Dual-focal-plane imaging, for example, the first focal plane is the near focal plane, and the virtual image of the first image located on the first focal plane is a near-view image, which can be used to display information that replaces vehicle instruments, such as vehicle speed, mileage, etc. The second focal plane is the far focal plane, and the virtual image of the second image located on the second focal plane is a far-view image, which can be used to provide richer and larger-area reality augmented information, thereby combining near and far views to better improve driving safety and driving experience, and solve the problem that existing HUDs can usually only achieve virtual image projection at a single distance; and, the transmission light paths of imaging with different focal planes share the first reflective element and the second reflective element, or in other words, the transmission light path of imaging with one focal plane is extended to achieve the dual-focal-plane imaging function, which can reduce the number of reflective elements in the dual-focal-plane head-up display device, greatly reduce the difficulty of assembly and adjustment and the manufacturing cost, and at the same time reduce the volume of the dual-focal-plane head-up display device to a certain extent, providing more layout space for the vehicle structure.

[0035] Furthermore, at least one of the first reflective element and the second reflective element is adjustable, thereby effectively expanding the eye box range so that drivers of different heights and postures can clearly see the virtual image of the first image located on the first focal plane and the virtual image of the second image located on the second focal plane.

[0036] Moreover, by adjusting the first reflecting element and / or the second reflecting element, the relative position and relative angle of the first reflecting element and the second reflecting element can be made to meet certain conditions, so that the stray light is eliminated by multiple reflections between the first reflecting element and the second reflecting element, thereby reducing or avoiding the stray light from being reflected onto the windshield and then reflected by the windshield into the human eye. In this way, the stray light caused by the backflow of sunlight is reduced or avoided, which on the one hand improves the image quality of the two focal planes, and on the other hand can also improve driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0038] Figure 1 A schematic diagram of the optical path structure of a head-up display device provided in an embodiment of the present application;

[0039] Figure 2 for Figure 1 A simplified optical path structure diagram of the head-up display device shown;

[0040] Figure 3 A schematic diagram of imaging spots on the image plane of the head-up display device provided in an embodiment of the present application;

[0041] Figure 4 A schematic diagram of an imaging effect of the head-up display device provided in an embodiment of the present application.

[0042] Reference numerals:

[0043] 10-first projection unit; 20-second projection unit; 30-first reflecting element; 40-second reflecting element; 50-windshield; 60-driver's eyes; 70-virtual image of the first image; 80-virtual image of the second image; 51-first near-focal plane reflection area; 52-first far-focal plane reflection area; 31-second near-focal plane reflection area; 32-second far-focal plane reflection area; 41-third near-focal plane reflection area; 42-third far-focal plane reflection area; X1-first focal plane; X2-second focal plane. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0045] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0046] As mentioned in the background technology section, existing HUDs can usually only project virtual images at a single distance, generally between 7.5 meters and 13 meters. If only a single focal plane display is used, it is difficult to intuitively meet the driver's need for reading text-based driving information. Especially in scenarios such as waiting at traffic lights, the virtual image in the distance can directly hit the vehicle in front, and the human-computer interaction experience will also be lacking.

[0047] Splitting the HUD display into two focal planes to show scene content at different distances has become a significant trend. One focal plane displays near-field information, replacing instrument gauges such as vehicle speed and mileage. The other displays far-field information, providing richer, larger-scale augmented reality information. This combination of near-field and far-field information creates a more integrated effect, enhancing driver safety and driving experience.

[0048] However, existing dual-focal-plane HUDs typically use different reflectors and different picture generation units (PGUs) to correspond to the near and far focal planes. This increases processing and testing costs and makes assembly and adjustment more difficult.

[0049] In view of this, an embodiment of the present application provides a head-up display device, Figure 1 The following is a schematic diagram showing the optical path structure of a head-up display device provided in an embodiment of the present application. In order to better understand the present application, Figure 2 It further shows Figure 1 The simplified optical path structure diagram of the head-up display device shown in FIG. Figure 1 and Figure 2 As shown, the head-up display device provided in the embodiment of the present application includes:

[0050] A first projection unit 10, configured to project a light beam of a first image;

[0051] A second projection unit 20, configured to project a light beam of a second image;

[0052] A first reflecting element 30, a second reflecting element 40 and a windshield 50 are sequentially arranged along the light transmission direction;

[0053] The first reflective element 30 is used to reflect the light beam of the first image projected by the first projection unit 10 to the second reflective element 40 , and to reflect the light beam of the second image projected by the second projection unit 20 to the second reflective element 40 ;

[0054] The second reflective element 40 is used to reflect the light beam of the first image reflected by the first reflective element 30 to the windshield 50 , and to reflect the light beam of the second image reflected by the first reflective element 30 to the windshield 50 ;

[0055] The windshield 50 is used to reflect the light beam of the first image reflected by the second reflecting element 40 to the driver's eyes 60, forming a virtual image 70 of the first image located at the first focal plane X1, and reflect the light beam of the second image reflected by the second reflecting element 40 to the driver's eyes 60, forming a virtual image 80 of the second image located at the second focal plane X2. The first focal plane X1 and the second focal plane X2 do not overlap.

[0056] With this arrangement, the first projection unit 10 projects a light beam of the first image onto the first reflective element 30 . After being reflected by the first reflective element 30 , the light beam reaches the second reflective element 40 . The second reflective element 40 reflects the light beam of the first image onto the windshield 50 . The windshield 50 then reflects the light beam of the first image onto the driver's eyes 60 , forming a virtual image 70 of the first image located at the first focal plane X1 .

[0057] Similarly, the second projection unit 20 projects the light beam of the second image to the first reflective element 30, which is reflected by the first reflective element 30 and reaches the second reflective element 40. The second reflective element 40 reflects the light beam of the second image to the windshield 50, and then the windshield 50 reflects the light beam of the second image to the driver's eyes 60, forming a virtual image 80 of the second image located at the second focal plane X2.

[0058] It can be understood that the virtual image 70 of the first image located at the first focal plane X1 and the virtual image 80 of the second image located at the second focal plane X2 are located in front of the windshield 50 .

[0059] Because the first focal plane X1 and the second focal plane X2 do not overlap, the head-up display device provided in the embodiments of the present application can achieve dual-focal-plane imaging of the first and second focal planes, resolving the problem that existing HUDs typically only achieve virtual image projection at a single distance. Furthermore, the transmission optical paths for imaging at different focal planes share the first reflective element 30 and the second reflective element 40. In other words, dual-focal-plane imaging is achieved by extending the transmission optical path of a single focal plane. This reduces the number of reflective elements in the dual-focal-plane head-up display device, significantly reducing assembly difficulty and manufacturing costs.

[0060] It should be noted that compared with the existing dual-focal plane HUD, which usually uses different reflectors and different image generation units, that is, requires two transmission light paths corresponding to two focal plane imaging respectively, and the area of ​​the reflector in each transmission light path is relatively small, the dual-focal plane head-up display device provided in the embodiment of the present application realizes two focal plane imaging through one transmission light path. Although the area of ​​the first reflective element 30 and the second reflective element 40 in the transmission light path is relatively large, since one transmission light path is reduced, the volume of the dual-focal plane head-up display device is also reduced to a certain extent, providing more layout space for the vehicle structure.

[0061] Optionally, in some embodiments of the present application, such as Figure 2 As shown, the horizontal distance d2 between the second focal plane X2 and the driver's eyes is greater than the horizontal distance d1 between the first focal plane X1 and the driver's eyes; that is, the first focal plane X1 is a near focal plane, and the virtual image 70 of the first image located on the first focal plane X1 is a near-view image; the second focal plane X2 is a far focal plane, and the virtual image 80 of the second image located on the second focal plane X2 is a far-view image, wherein the near-view image can be used to display information that replaces vehicle instruments, such as vehicle speed, mileage, etc., and the far-view image can be used to provide richer and larger-area reality augmented information. In this way, the dual-focal plane head-up display device provided in this embodiment can realize the combination of near and far views, thereby better improving driving safety and driving experience.

[0062] It can be understood that, after the light beam of the first image projected by the first projection unit 10 passes through the first reflecting element 30, the second reflecting element 40 and the windshield 50 in sequence, not only the virtual image of the first image is formed on the first focal plane X1, but the first image is also magnified. That is, the virtual image of the first image located at the first focal plane X1 is the magnified image of the first image projected by the first projection unit 10; similarly, after the light beam of the second image projected by the second projection unit 20 passes through the first reflecting element 30, the second reflecting element 40 and the windshield 50 in sequence, not only the virtual image of the second image is formed on the second focal plane X2, but the second image is also magnified. That is, the virtual image of the second image located at the second focal plane X2 is the magnified image of the second image projected by the second projection unit 20.

[0063] Since the second focal plane X2 is a far focal plane, the first focal plane X1 is a near focal plane, and considering that the driver sees images that are far away as smaller and images that are near as larger, therefore, Figure 1 and Figure 2 As shown, the optical path of the light beam of the second image from the second projection unit 20 to the driver's eyes 60 is set to be greater than the optical path of the light beam of the first image from the first projection unit 10 to the driver's eyes 60, that is, the optical path s2 of the light beam of the second image projected by the second projection unit 20 after passing through the first reflecting element 30, the second reflecting element 40 and the windshield 50 in sequence and reaching the driver's eyes 60 is greater than the optical path s1 of the light beam of the first image projected by the first projection unit 10 after passing through the first reflecting element 30, the second reflecting element 40 and the windshield 50 in sequence and reaching the driver's eyes 60. In this way, the object distance of the far focal plane imaging is greater than the object distance of the near focal plane imaging, and the image distance of the far focal plane imaging is also greater than the image distance of the near focal plane imaging, so that the magnification of the far focal plane imaging is greater than the magnification of the near focal plane imaging, so that the driver's eyes can clearly see the virtual image of the second image located on the second focal plane X2.

[0064] We know that windshields are usually Figure 1 and Figure 2 To achieve imaging at both the near focal plane (i.e., the first focal plane X1) and the far focal plane (i.e., the second focal plane X2), the windshield 50 may include a first near focal plane reflection area 51 and a first far focal plane reflection area 52, wherein the first far focal plane reflection area 52 is higher than the first near focal plane reflection area 51. The first near focal plane reflection area 51 is configured to reflect the light beam of the first image reflected by the second reflective element 40 toward the driver's eyes 60, forming a virtual image 70 of the first image located at the first focal plane X1. The first far focal plane reflection area 52 is configured to reflect the light beam of the second image reflected by the second reflective element 40 toward the driver's eyes 60, forming a virtual image 80 of the second image located at the second focal plane X2.

[0065] In this embodiment, since the first far focal plane reflection area 52 is higher than the first near focal plane reflection area 51, that is, the first near focal plane reflection area 51 is located in a lower area of ​​the windshield 50, the first focal plane X1 is a near focal plane, and a virtual image 70 of the first image is formed on the near focal plane. The first far focal plane reflection area 52 is located in a higher area of ​​the windshield 50, so that the second focal plane X2 is a far focal plane, and a virtual image 80 of the second image is formed on the far focal plane.

[0066] In this embodiment, the first near-focal plane reflection area 51 and the first far-focal plane reflection area 52 on the windshield 50 can be independent of each other and not overlap, or they can partially overlap. This application does not limit this, but the first far-focal plane reflection area 52 is higher than the first near-focal plane reflection area 51.

[0067] Optionally, in some embodiments of the present application, such as Figure 1 and Figure 2 As shown, the first reflecting element 30 and the second reflecting element 40 are located below the windshield 50, the first reflecting element 30 and the second reflecting element 40 are arranged opposite to each other, and the second reflecting element 40 is closer to the windshield than the first reflecting element 30; and the first projection unit 10 and the second projection unit 20 are located on the side of the second reflecting element 40 away from the windshield 50, and the second projection unit 20 is farther away from the windshield than the first projection unit 10. In this way, it is beneficial for the light beam of the first image projected by the first projection unit 10 to reach the first near-focal plane reflection area 51 of the windshield 50 after being reflected by the first reflecting element 30 and the second reflecting element 40, and then enter the driver's eyes 60 after being reflected by the first near-focal plane reflection area 51 of the windshield 50, forming a virtual image 70 of the first image on the first focal plane X1; and it is beneficial for the light beam of the second image projected by the second projection unit 20 to reach the first far-focal plane reflection area 52 of the windshield 50 after being reflected by the first far-focal plane reflection area 52 of the windshield 50, and then enter the driver's eyes 60 after being reflected by the first far-focal plane reflection area 52 of the windshield 50, and forming a virtual image 80 of the second image on the second focal plane X2.

[0068] Optionally, in some embodiments of the present application, such as Figure 1 and Figure 2 As shown, the first reflecting element 30 has a concave surface, and the concave surface of the first reflecting element 30 is used to reflect the light beam of the first image projected by the first projection unit 10 to the second reflecting element 40, and reflect the light beam of the second image projected by the second projection unit 20 to the second reflecting element 40; in this way, it is beneficial for the light beam of the first image projected by the first projection unit 10 and the light beam of the second image projected by the second projection unit 20 to reach the first reflecting element 30 and be reflected by the first reflecting element 30.

[0069] In this embodiment, the second reflecting element 40 has a convex surface, and the convex surface of the second reflecting element 40 is used to reflect the light beam of the first image reflected by the first reflecting element 30 to the windshield 50 (specifically to the first near-focal plane reflection area 51 of the windshield 50), and reflect the light beam of the second image reflected by the first reflecting element 30 to the windshield 50 (specifically to the first far-focal plane reflection area 52 of the windshield 50); in this way, it is beneficial for the second reflecting element 40 to receive the light beam of the first image and the light beam of the second image reflected by the first reflecting element 30, and reflect the light beam of the first image and the light beam of the second image reflected by the first reflecting element 30 to the corresponding areas of the windshield 50.

[0070] Optionally, the first reflecting element 30 and the second reflecting element 40 are both free-form surface reflectors, the first reflecting element 30 is a free-form surface reflector with a concave surface, and the second reflecting element 40 is a free-form surface reflector with a convex surface. In this way, the imaging quality can be improved, the optical field of view can be increased, and the system aberration can be corrected.

[0071] Further optionally, in some embodiments of the present application, such as Figure 1 and Figure 2 As shown, the concave surface of the first reflective element 30 includes a second near-focal plane reflection area 31 and a second far-focal plane reflection area 32. The second near-focal plane reflection area 31 is closer to the windshield 50 than the second far-focal plane reflection area 32. That is, the second near-focal plane reflection area 31 is located above the second far-focal plane reflection area 32.

[0072] The convex surface of the second reflective element 40 includes a third near-focal plane reflection area 41 and a third far-focal plane reflection area 42. The third near-focal plane reflection area 41 is closer to the windshield 50 than the third far-focal plane reflection area 42. That is, the third near-focal plane reflection area 41 is located above the third far-focal plane reflection area 42.

[0073] The second near-focal-plane reflection area 31 is used to reflect the light beam of the first image projected by the first projection unit 10 to the third near-focal-plane reflection area 41, and the third near-focal-plane reflection area 41 is used to reflect the light beam of the first image reflected by the second near-focal-plane reflection area 31 to the windshield 50 (specifically, the first near-focal-plane reflection area 51 of the windshield 50), so that the first near-focal-plane reflection area 51 of the windshield 50 reflects the light beam of the first image reflected by the third near-focal-plane reflection area 41 to the driver's eye 60, forming a virtual image 70 of the first image on the first focal plane X1.

[0074] The second far-focal-plane reflection area 32 is used to reflect the light beam of the second image projected by the second projection unit 20 to the third far-focal-plane reflection area 42, and the third far-focal-plane reflection area 42 is used to reflect the light beam of the second image reflected by the second far-focal-plane reflection area 32 to the windshield 50 (specifically to the first far-focal-plane reflection area 52 of the windshield 50), so that the first far-focal-plane reflection area 52 of the windshield 50 reflects the light beam of the second image reflected by the third far-focal-plane reflection area 42 to the driver's eyes 60, forming a virtual image 80 of the second image on the second focal plane X2.

[0075] In this embodiment, optionally, the second near-focal plane reflection area 31 and the second far-focal plane reflection area 32 of the concave surface of the first reflecting element 30 can be independent of each other and not overlap. In this case, the area of ​​the concave surface of the first reflecting element 30 needs to be relatively large; another option is that the second near-focal plane reflection area 31 and the second far-focal plane reflection area 32 of the concave surface of the first reflecting element 30 can also partially overlap. In this case, the area of ​​the concave surface of the first reflecting element 30 needs to be relatively small.

[0076] Similarly, optionally, the third near-focal plane reflection area 41 and the third far-focal plane reflection area 42 of the convex surface of the second reflecting element 40 can be independent of each other and not overlap. In this case, the area of ​​the convex surface of the second reflecting element 40 needs to be relatively large; another optional option is that the third near-focal plane reflection area 41 and the third far-focal plane reflection area 42 of the convex surface of the second reflecting element 40 can also partially overlap. In this case, the area of ​​the convex surface of the second reflecting element 40 needs to be relatively small.

[0077] It can be seen from the aforementioned embodiments that in the head-up display device provided in the embodiments of the present application, the light beam of the first image projected by the first projection unit 10 first reaches the second near-focal plane reflection area 31 of the first reflection element 30, is reflected by the second near-focal plane reflection area 31 of the first reflection element 30 to the third near-focal plane reflection area 41 of the second reflection element 40, and then is reflected by the third near-focal plane reflection area 41 of the second reflection element 40 to the first near-focal plane reflection area 51 of the windshield 50, and finally enters the driver's eyes 60, forming a virtual image 70 of the first image on the first focal plane X1, that is, forming a near-focal plane image.

[0078] The light beam of the second image projected by the second projection unit 20 first reaches the second far-focal-plane reflection area 32 of the first reflection element 30, is reflected by the second far-focal-plane reflection area 32 of the first reflection element 30 to the third far-focal-plane reflection area 42 of the second reflection element 40, is then reflected by the third far-focal-plane reflection area 42 of the second reflection element 40 to the first far-focal-plane reflection area 52 of the windshield 50, and finally enters the driver's eye 60, forming a virtual image 80 of the second image on the second focal plane X2, that is, forming a far-focal-plane image.

[0079] In an embodiment of the present application, optionally, the transmission light path for near-focal plane imaging and the transmission light path for far-focal plane imaging may be independent of each other and not overlap, in which case the areas of the first reflective element 30 and the second reflective element 40 are relatively large, and the volume of the head-up display device is relatively large; another option is that the transmission light path for near-focal plane imaging and the transmission light path for far-focal plane imaging may also partially overlap, in which case the areas of the first reflective element 30 and the second reflective element 40 are relatively small, and the volume of the head-up display device is relatively small.

[0080] Optionally, in some embodiments of the present application, at least one of the first reflecting element 30 and the second reflecting element 40 is adjustable, that is, the first reflecting element 30 is adjustable, or the second reflecting element 40 is adjustable, or both the first reflecting element 30 and the second reflecting element 40 are adjustable.

[0081] It is understandable that factors such as the driver's height, sitting posture, and head position can affect the position of the eyes and the direction of their line of sight, resulting in different driving perspectives for each person. Therefore, the dual-focal-plane head-up display device provided in the embodiments of the present application needs to adapt to different driver heights to ensure that the driver can clearly see the images of both focal planes when their eyes are located within the eyebox area, where the eyebox refers to the area within which the driver's eyes can move. In this embodiment, by adjusting the first reflective element 30 and / or the second reflective element 40, the eyebox range can be effectively expanded, allowing drivers of different heights and postures to clearly see the virtual image of the first image located on the first focal plane X1 and the virtual image of the second image located on the second focal plane X2.

[0082] It can also be understood that, both in position and in the optical path, the second reflective element 40 is closer to the windshield 50 than the first reflective element. Thus, adjusting the second reflective element 40 can more directly change the position at which the light beam reflected by the second reflective element 40 reaches the windshield 50, thereby changing the position of the driver's eyes at which the light beam enters after being reflected by the corresponding position of the windshield 50.

[0083] As we all know, a head-up display (HUD) is essentially an optical system that, through the necessary optical path, ultimately forms a virtual image on the windshield. In HUDs, stray light caused by sunlight backflow is a common technical issue that needs to be addressed. This refers to strong sunlight entering the HUD's optical system through non-imaging paths (such as the edges of reflectors) and ultimately entering the human eye. Firstly, stray light can affect image quality, and secondly, strong or sudden stray light can affect driving safety. In this embodiment, by adjusting the first reflective element 30 and / or the second reflective element 40, the relative position and angle between the first reflective element 30 and the second reflective element 40 can be adjusted to meet certain conditions. This allows stray light to be eliminated through multiple reflections between the first reflective element 30 and the second reflective element 40, thereby reducing or preventing stray light from being reflected back onto the windshield 50 and then entering the human eye. This reduces or prevents stray light caused by sunlight backflow, improving image quality at both focal planes and enhancing driving safety.

[0084] Optionally, in some embodiments of the present application, the first projection unit 10 includes a first image element and a first diffusion element, wherein the first image element is used to generate a light beam of a first image, and the first diffusion element is used to expand the light beam of the first image generated by the first image element to project a light beam of the first image; the second projection unit 20 includes a second image element and a second diffusion element, wherein the second image element is used to generate a light beam of a second image, and the second diffusion element is used to expand the light beam of the second image generated by the second image element to project a light beam of the second image.

[0085] Optionally, the first image element and the second image element can be two different image elements, such as two different projection lenses. Alternatively, the first image element and the second image element can also correspond to the same image element, which uses a single projection lens to generate an image and outputs the generated image at two different positions through optical path folding technology.

[0086] Based on any of the above embodiments, optionally, in some embodiments of the present application, the horizontal distance d2 between the second focal plane X2 and the driver's eyes 60 is 10 m; the horizontal distance d1 between the first focal plane X1 and the driver's eyes 60 is 3 m; it can be understood that the virtual image distance (or virtual image depth) of the far focal plane is large, the virtual image distance (or virtual image depth) of the near focal plane is small, and the virtual image distance of the far focal plane and the virtual image distance of the near focal plane satisfy the above distance, which can avoid overlapping with the real world and affecting the driver, and for the driver, it is a more friendly display mode, which is conducive to improving driving safety and experience.

[0087] Further, Figure 3 The imaging spot on the image plane of the head-up display device provided by the embodiments of the present application is shown, and it can be seen that the imaging spot on the image plane of the head-up display device provided by the embodiments of the present application is very small and can be very uniform, so as to form a high-quality image.

[0088] Figure 4 An imaging effect schematic diagram of the head-up display device provided by the embodiments of the present application is shown, wherein the virtual image of the first image of the near focal plane can display information replacing the vehicle instrument, such as vehicle speed, mileage, etc., and the virtual image of the second image of the far focal plane can provide more rich and large-area real augmented information, such as navigation information.

[0089] In summary, the head-up display device provided by the embodiment of the present application includes a first projection unit 10 and a second projection unit 20, and a first reflecting element 30, a second reflecting element 40 and a windshield 50 arranged in sequence along the transmission direction of the optical path, wherein the first projection unit 10 projects a light beam of the first image to the first reflecting element 30, which is reflected by the first reflecting element 30 and reaches the second reflecting element 40, and the second reflecting element 40 reflects the light beam of the first image to the windshield 50, and then the windshield 50 reflects the light beam of the first image to the driver's eyes 60, forming a virtual image 70 of the first image located at the first focal plane X1; the second projection unit 20 projects a light beam of the second image to the first reflecting element 30, which is reflected by the first reflecting element 30 and reaches the second reflecting element 40, and the second reflecting element 40 reflects the light beam of the second image to the windshield 50, and then the windshield 50 reflects the light beam of the second image to the driver's eyes 60, forming a virtual image 80 of the second image located at the second focal plane X2; the first focal plane X1 and The second focal plane X2 does not overlap; in this way, dual-focal plane imaging of the first focal plane and the second focal plane can be achieved. For example, the first focal plane is a near focal plane, and the virtual image of the first image located on the first focal plane is a near-view image, which can be used to display information that replaces the vehicle instrument, such as vehicle speed, mileage, etc. The second focal plane is a far focal plane, and the virtual image of the second image located on the second focal plane is a far-view image, which can be used to provide richer and larger-area reality augmented information, thereby combining the near and far views with each other to better improve driving safety and driving experience, and solve the problem that the existing HUD can usually only achieve virtual image projection at a single distance; and, the transmission light paths of different focal plane imaging share the first reflecting element 30 and the second reflecting element 40, or in other words, the transmission light path of one focal plane imaging is extended to achieve the dual-focal plane imaging function, which can reduce the number of reflecting elements in the dual-focal plane head-up display device, greatly reduce the difficulty of assembly and adjustment and the manufacturing cost, and at the same time reduce the volume of the dual-focal plane head-up display device to a certain extent, providing more layout space for the entire vehicle structure.

[0090] Furthermore, at least one of the first reflective element 30 and the second reflective element 40 is adjustable, thereby effectively expanding the eye box range so that drivers of different heights and postures can clearly see the virtual image of the first image located on the first focal plane X1 and the virtual image of the second image located on the second focal plane X2.

[0091] Furthermore, by adjusting the first reflecting element 30 and / or the second reflecting element 40, the relative position and relative angle of the first reflecting element 30 and the second reflecting element 40 can be made to meet certain conditions, so that the stray light is eliminated by multiple reflections between the first reflecting element 30 and the second reflecting element 40, thereby reducing or avoiding the stray light from being reflected onto the windshield 50 and then reflected by the windshield 50 into the human eye. In this way, the stray light caused by the backflow of sunlight is reduced or avoided, which on the one hand improves the image quality of the two focal planes, and on the other hand can also improve driving safety.

[0092] The various parts in this manual are described in a combination of parallel and progressive manners. Each part focuses on the differences from other parts, and the same or similar parts between the various parts can be referenced to each other.

[0093] With respect to the above description of the disclosed embodiments, the features described in the various embodiments in this specification may be interchanged or combined with one another to enable those skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A head-up display device, characterized in that: include: a first projection unit, configured to project a light beam of a first image; a second projection unit, configured to project a light beam of a second image; A first reflecting element, a second reflecting element and a windshield are sequentially arranged along the light transmission direction; The first reflective element is configured to reflect the light beam of the first image projected by the first projection unit to the second reflective element, and to reflect the light beam of the second image projected by the second projection unit to the second reflective element; The second reflecting element is configured to reflect the light beam of the first image reflected by the first reflecting element toward the windshield, and to reflect the light beam of the second image reflected by the first reflecting element toward the windshield; The windshield is used to reflect the light beam of the first image reflected by the second reflecting element to the driver's eyes, forming a virtual image of the first image located at a first focal plane, and reflect the light beam of the second image reflected by the second reflecting element to the driver's eyes, forming a virtual image of the second image located at a second focal plane, and the first focal plane and the second focal plane do not overlap.

2. The head-up display device according to claim 1, characterized in that: The horizontal distance between the second focal plane and the driver's eyes is greater than the horizontal distance between the first focal plane and the driver's eyes; An optical distance of the light beam of the second image from the second projection unit to the driver's eyes is greater than an optical distance of the light beam of the first image from the first projection unit to the driver's eyes.

3. The head-up display device according to claim 2, characterized in that: The windshield comprises a first near-focal plane reflection area and a first far-focal plane reflection area, wherein the first far-focal plane reflection area is higher than the first near-focal plane reflection area; The first near-focal-plane reflection area is used to reflect the light beam of the first image reflected by the second reflection element to the driver's eyes, forming a virtual image of the first image located at the first focal plane; The first far-focal-plane reflection area is used to reflect the light beam of the second image reflected by the second reflection element to the driver's eyes, forming a virtual image of the second image located on the second focal plane.

4. The head-up display device according to claim 3, characterized in that: The first reflective element and the second reflective element are located below the windshield, the first reflective element and the second reflective element are arranged opposite to each other, and the second reflective element is closer to the windshield than the first reflective element; The first projection unit and the second projection unit are located on a side of the second reflective element away from the windshield, and the second projection unit is farther away from the windshield than the first projection unit.

5. The head-up display device according to claim 4, characterized in that: The first reflective element has a concave surface, and the concave surface of the first reflective element is used to reflect the light beam of the first image projected by the first projection unit to the second reflective element, and reflect the light beam of the second image projected by the second projection unit to the second reflective element; The second reflecting element has a convex surface, and the convex surface of the second reflecting element is used to reflect the light beam of the first image reflected by the first reflecting element to the windshield, and to reflect the light beam of the second image reflected by the first reflecting element to the windshield.

6. The head-up display device according to claim 5, characterized in that: The concave surface of the first reflective element includes a second near-focal plane reflective area and a second far-focal plane reflective area, and the second near-focal plane reflective area is closer to the windshield than the second far-focal plane reflective area; The convex surface of the second reflective element includes a third near-focal plane reflection area and a third far-focal plane reflection area, and the third near-focal plane reflection area is closer to the windshield than the third far-focal plane reflection area; The second near-focal-plane reflection area is used to reflect the light beam of the first image projected by the first projection unit to the third near-focal-plane reflection area, and the third near-focal-plane reflection area is used to reflect the light beam of the first image reflected by the second near-focal-plane reflection area to the windshield; The second far-focal-plane reflection area is used to reflect the light beam of the second image projected by the second projection unit to the third far-focal-plane reflection area, and the third far-focal-plane reflection area is used to reflect the light beam of the second image reflected by the second far-focal-plane reflection area to the windshield.

7. The head-up display device according to claim 5 or 6, characterized in that: The first reflecting element and the second reflecting element are both free-form surface reflecting mirrors.

8. The head-up display device according to claim 5 or 6, characterized in that: At least one of the first reflective element and the second reflective element is adjustable.

9. The head-up display device according to claim 1, characterized in that: The first projection unit includes a first image element and a first diffusion element, the first image element is used to generate a light beam of the first image, and the first diffusion element is used to expand the light beam of the first image generated by the first image element to project the light beam of the first image; The second projection unit includes a second image element and a second diffusion element. The second image element is used to generate a light beam of the second image. The second diffusion element is used to expand the light beam of the second image generated by the second image element to project the light beam of the second image.

10. The head-up display device according to claim 1, characterized in that: The horizontal distance between the second focal plane and the driver's eyes is 10m; The horizontal distance between the first focal plane and the driver's eyes is 3m.

Images