An optical system, a dual-focus head-up display system and a vehicle

Abstract

The present application provides an optical system for a dual-focus head-up display system, which relates to the technical field of head-up displays. The system includes an image generation unit; a first polarization processing module, which includes a first near-focus polarization unit and a first far-focus polarization unit; a reflection module for reflecting the first polarized light and the second polarized light; a second polarization processing module including a second near-focus polarization unit and a second far-focus polarization unit; an optical zoom module located at any position on the light propagation path between the first polarization processing module and the second polarization processing module. The optical zoom module is used to perform zoom processing on at least one of the first polarized light and the second polarized light, so that the first polarized light is adapted to form a near-focus virtual image at a first near-focus position outside the windshield or a near-focus real image at a second near-focus position inside the windshield, and also enables the second polarized light to form a far-focus virtual image at a far-focus position outside the windshield. The present application has the characteristics of achieving the display effect of a dual-focus surface while also being miniaturized.

Description

Technical Field

[0001] The present application relates to the technical field of head-up display, and more particularly, to a dual-focus head-up display system and a vehicle equipped with the display system. Background Art

[0002] In recent years, the per capita ownership of automobiles has been increasing year by year. At the same time, road safety accidents have also been growing continuously. People have begun to shift more and more attention to the direction of intelligent driving, using technological means to ensure driving safety. The in-vehicle head-up display system (Head-up Display, hereinafter referred to as HUD) is a kind of intelligent auxiliary driving, which can project information such as the dashboard, tachometer, fuel gauge, etc. onto the windshield by means of projection, reducing the driving blind area caused by the driver looking down at relevant information during driving. Among them, the projection position, the size of the virtual image displayed by projection, etc. can be determined by optical design.

[0003] The traditional in-vehicle head-up display system can only form an image at a fixed position, that is, there is only one focal plane. The traditional method is that the light emitted from the light source is reflected for the first time after hitting the secondary mirror, then reflected to the primary mirror, and the light is then reflected from the primary mirror to the windshield, and then reflected from the windshield to the human eye. The human eye looks in the direction opposite to the direction of the light, and a magnified virtual image can be seen. However, the single-focus HUD results in a lack of rich imaging effects.

[0004] In order to make the imaging rich, most of the dual-focus HUD products on the market adopt two sets of display systems, that is, two sets of reflection modules and light sources, which makes the volume larger and the assembly more difficult. Summary of the Invention

[0005] Based on the above situation, the main object of the present invention is to provide a dual-focus head-up display system and a vehicle equipped with the display system, aiming to achieve the dual-focus display effect while minimizing the volume of the display system.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] On the one hand, the present application provides an optical system for a dual-focus head-up display system, including:

[0008] An image generation unit for emitting near-focus image light and far-focus image light;

[0009] The first polarization processing module includes a first near - focus polarization unit and a first far - focus polarization unit. The first near - focus polarization unit is used to perform polarization processing on the near - focus image light so that only the first polarized light can pass through the near - focus image light. The first far - focus polarization unit is used to perform polarization processing on the far - focus image light so that only the second polarized light can pass through the far - focus image light. The polarization directions of the first polarized light and the second polarized light are perpendicular to each other;

[0010] The reflection module is used to reflect the first polarized light and the second polarized light;

[0011] The second polarization processing module is arranged on the light - emitting path between the reflection module and the windshield. The second polarization processing module includes a second near - focus polarization unit and a second far - focus polarization unit. The second near - focus polarization unit is set to only allow the first polarized light to pass through, and the second far - focus polarization unit is set to only allow the second polarized light to pass through;

[0012] The optical zoom module is located at any position on the light - propagation path between the first polarization processing module and the second polarization processing module. The optical zoom module is used to perform zoom processing on at least one of the first polarized light and the second polarized light passing through the first polarization processing module, so that the first polarized light is suitable for forming a near - focus virtual image at a first near - focus position outside the windshield or a near - focus real image at a second near - focus position inside the windshield after being reflected by the windshield, and also so that the second polarized light forms a far - focus virtual image at a far - focus position outside the windshield after being reflected by the windshield.

[0013] The near - focus light - transmitting area is set to perform zoom processing on the first polarized light, and / or the far - focus light - transmitting area is set to perform zoom processing on the second polarized light.

[0014] Preferably, the near - focus light - transmitting area is set to perform refractive divergence processing on the first polarized light, and / or the far - focus light - transmitting area is set to perform refractive convergence processing on the second polarized light.

[0015] Preferably, the optical zoom module includes one or any combination of a single lens, a doublet lens, a multi - lens or a meta - lens.

[0016] Preferably, the near - focus light - transmitting area is attached to the side of the second near - focus polarization unit facing the incidence of the first polarized light and the second polarized light, and / or the far - focus light - transmitting area is attached to the side of the second far - focus polarization unit facing the incidence of the first polarized light and the second polarized light.

[0017] Preferably, the image generation unit is integrally arranged and includes a near - focus light - emitting area for emitting the near - focus image light and a far - focus light - emitting area for emitting the far - focus image light.

[0018] Preferably, the first near-focus polarization unit is attached to the near-focus light-emitting area, and / or the first far-focus polarization unit is attached to the far-focus light-emitting area.

[0019] Preferably, when the optical zoom module is located inside the reflection module, the reflection module is configured to allow the optical paths of the first polarized light and the second polarized light to cross before entering the optical zoom module;

[0020] When the optical zoom module is located on the light-emitting path of the reflection module, the reflection module is configured to allow the optical paths of the first polarized light and the second polarized light to cross at any position inside the reflection module.

[0021] In a second aspect, the present application provides a dual-focus head-up display system, including the optical system described above.

[0022] In a third aspect, a vehicle includes a windshield and the dual-focus head-up display system described above.

[0023] Beneficial effects:

[0024] 1. In the optical system for a dual-focus head-up display system provided by the exemplary embodiment of the present application, first, the first polarization processing module processes the near-focus image light and the far-focus image light emitted by the image generation unit. Specifically, the first near-focus polarization unit of the first polarization processing module polarizes the near-focus image light, so that the near-focus image light passing through the first near-focus polarization unit is only the first polarized light (polarized light in other directions is filtered out). The first far-focus polarization unit of the first polarization processing module polarizes the far-focus image light, so that the far-focus image light passing through the first far-focus polarization unit is only the second polarized light (polarized light in other directions is filtered out). The reflection module is configured to reflect the first polarized light of the near-focus image light and the second polarized light of the far-focus image light. When the optical zoom module is disposed inside the reflection module, the optical zoom module can easily perform zoom processing on at least one of the separated first polarized light or second polarized light, thereby changing the distance of the images formed by the first polarized light and the second polarized light, and achieving the effect of a dual focal plane. Specifically, by performing zoom processing on at least one of the first polarized light and the second polarized light by the optical zoom module, the first polarized light is adapted to form a near-focus virtual image at the first near-focus position outside the windshield or a near-focus real image at the second near-focus position inside the windshield after being reflected by the windshield, and the second polarized light forms a far-focus virtual image at the far-focus position outside the windshield after being reflected by the windshield. The first polarized light of the near-focus image light and the second polarized light of the far-focus image light enter the second near-focus polarization unit of the second polarization processing module. Since the second near-focus polarization unit is configured to only allow the first polarized light to pass through, the second polarized light of the far-focus image light entering the second near-focus polarization unit is filtered out. Similarly, since the second far-focus polarization unit is configured to only allow the second polarized light to pass through, the first polarized light of the near-focus image light entering the second far-focus polarization unit is filtered out. Thus, through the cooperation of the first polarization processing module and the second polarization processing module, the first polarized light carrying near-focus image information and the second polarized light carrying far-focus image information are separated.

[0025] On the one hand, the optical system provided by the exemplary embodiment of the present application can achieve ghost image elimination through the cooperation of the first polarization processing module and the second polarization processing module, that is, it can avoid stray light interfering with the two images when forming two images at different distances (double virtual images or one virtual image and one real image). On the other hand, the optical system provided by the exemplary embodiment of the present application adopts a relatively lightweight design to achieve dual-focus imaging, that is, it uses a set of optical systems and the same image generation unit to simplify the system as much as possible, which makes the head-up display product using this optical system smaller in volume, can reduce the installation difficulty of the head-up display product, and thus can be adapted to more vehicle models. On the other hand, the optical system provided by the exemplary embodiment of the present application can achieve the dual-focus plane effect of double virtual images or one virtual image and one real image by designing the zoom parameters of the optical zoom module, which is beneficial to realizing a richer human-computer interaction function.

[0026] 2. In the optical system provided by the exemplary embodiment of the present application, by integrally arranging the image generation unit, including a near-focus light-emitting area for emitting near-focus image light and a far-focus light-emitting area for emitting far-focus image light, the overall optical system is made more compact and the structure is simpler, and when applied to the HUD product, it can further reduce the volume of the HUD product.

[0027] 3. In the optical system provided by the exemplary embodiment of the present application, when the optical zoom module is located inside the reflection module, the reflection module is arranged to allow the optical paths of the first polarized light and the second polarized light to cross before entering the optical zoom module; when the optical zoom module is located on the light exit path of the reflection module, the reflection module is arranged to allow the optical paths of the first polarized light and the second polarized light to cross at any position inside the reflection module. The optical system provided by the exemplary embodiment of the present application makes the images formed by the first polarized light and the second polarized light not interfere with each other through the cooperation of the near-focus light-transmitting area and the far-focus light-transmitting area. Therefore, arranging the reflection module to allow the optical paths of the first polarized light and the second polarized light to cross means that the length dimension of the reflection mirror surface of the reflection module can be set smaller, without the need to use a large reflection mirror surface as in the related art to completely separate the near-focus image light and the far-focus image light.

[0028] Other beneficial effects of the present invention will be described in the specific implementation manner through the introduction of specific technical features and technical solutions. Those skilled in the art should be able to understand the beneficial technical effects brought by the technical features and technical solutions through these introductions. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The following will describe the preferred embodiments of a dual-focus plane head-up display system and a vehicle having the display system of the present invention with reference to the accompanying drawings. In the figures:

[0030] Figure 1 This is a schematic optical path diagram showing the near - focus virtual image and far - focus virtual image formed when the optical zoom module is disposed between the reflection module and the second polarization processing module in Embodiment 1 of the present application;

[0031] Figure 2 This is an exploded view showing the specific structures of the second polarization processing module and the optical zoom module in Embodiment 1 of the present application;

[0032] Figure 3 This is a schematic optical path diagram showing the near - focus virtual image and far - focus virtual image formed when the optical zoom module is disposed inside the reflection module in Embodiment 1 of the present application;

[0033] Figure 4 This is a schematic optical path diagram showing the near - focus virtual image and far - focus virtual image formed when the optical zoom module is disposed between the reflection module and the image generation unit in Embodiment 1 of the present application;

[0034] Figure 5 This is a schematic optical path diagram showing the near - focus real image and far - focus virtual image formed when the optical zoom module is disposed between the reflection module and the second polarization processing module in Embodiment 2 of the present application;

[0035] Figure 6 This is a schematic optical path diagram showing the near - focus real image and far - focus virtual image formed when the optical zoom module is disposed inside the reflection module in Embodiment 2 of the present application;

[0036] Figure 7 This is a schematic optical path diagram showing the near - focus real image and far - focus virtual image formed when the optical zoom module is disposed between the reflection module and the image generation unit in Embodiment 2 of the present application.

[0037] Explanation of reference numerals:

[0038] 1. Image generation unit; 2. First polarization processing module; 21. First near - focus polarization unit; 22. First far - focus polarization unit; 3. Reflection module; 31. First reflection element; 32. Second reflection element; 4. Second polarization processing module; 41. Second near - focus polarization unit; 42. Second far - focus polarization unit; 5. Near - focus virtual image; 6. Far - focus virtual image; 7. Near - focus real image; 8. Eyebox; 9. Optical zoom module; 91. Near - focus light - transmitting area; 92. Far - focus light - transmitting area. Detailed implementation manners

[0039] The present invention is described below based on embodiments, but the present invention is not limited to these embodiments. In the following detailed description of the present invention, some specific details are described in detail. In order to avoid obscuring the essence of the present invention, well - known methods, processes, procedures, and components are not described in detail.

[0040] In addition, those of ordinary skill in the art should understand that the accompanying drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale.

[0041] Unless the context clearly requires otherwise, the words such as "including", "comprising" and the like in the whole specification and claims should be construed in an inclusive sense rather than an exclusive or exhaustive sense; that is, it is the meaning of "including but not limited to".

[0042] In the description of the present invention, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0043] Hereinafter, some terms in this application will be explained. It should be noted that these explanations are for the convenience of those skilled in the art and do not constitute a limitation on the scope of protection required by this application.

[0044] Eye box:

[0045] The eye box generally refers to the range within which the driver's eyes can see the entire display image.

[0046] Virtual image:

[0047] The virtual image light beam is divergent, that is, the virtual image is the intersection point of the reverse extension lines of the actual light rays. The virtual image cannot be reached by the actual light rays and therefore cannot be received by a light screen. In the embodiments of this application, the image formed outside the windshield is a virtual image.

[0048] Real image:

[0049] The real image is an image that can be presented on a light screen and is formed by the convergence of actual light rays. In the embodiments of this application, the image formed inside the windshield is a real image.

[0050] Based on the above, a possible application scenario is provided for this application. Taking a vehicle as an example, the optical system is required to project the information in the vehicle instrument (such as vehicle speed, fuel quantity, etc.) and navigation information (such as road signs, route guidance, kilometers, etc.) through the windshield within the driver's field of vision. Among them, the virtual image corresponding to the navigation information can be superimposed on the real environment outside the vehicle, so that the driver can obtain an augmented reality visual effect, such as being used for AR navigation, adaptive cruise, lane departure warning, etc. In order not to interfere with the road conditions, the distance from the virtual image corresponding to the instrument information to the eye box is set to about 2m to 3m. In order to better integrate the virtual image corresponding to the navigation information with the real road surface, the distance from the virtual image corresponding to the navigation information to the eye box is set to about 7m to 15m.

[0051] The "voice assistant" information can also be projected inside the vehicle (e.g., above the instrument panel) through the windshield to form a "Genie Assistant" in the form of a real image. It can be summoned through voice calls and assist the driver in performing some operating functions during driving (such as opening the window, adjusting the air conditioner, playing music, etc.). It can also dance during the music playing process, increasing the sense of agility in the cab.

[0052] Furthermore, the above scenario is just an example. The optical system provided by this application can also be applied to other scenarios, such as other transportation means like airplanes and ships.

[0053] Embodiment 1

[0054] Based on the above content, as Figure 1 and Figure 2 shown, an optical system for a dual - focal - plane head - up display system provided by an embodiment of this application includes:

[0055] An image generation unit 1 for emitting near - focal image light rays and far - focal image light rays;

[0056] A first polarization processing module 2 includes a first near - focal polarization unit 21 and a first far - focal polarization unit 22. The first near - focal polarization unit 21 is used to perform polarization processing on the near - focal image light rays so that only the first polarized light can pass through the near - focal image light rays. The first far - focal polarization unit 22 is used to perform polarization processing on the far - focal image light rays so that only the second polarized light can pass through the far - focal image light rays. The polarization directions of the first polarized light and the second polarized light are perpendicular to each other;

[0057] A reflection module 3 for reflecting the first polarized light and the second polarized light;

[0058] A second polarization processing module 4 is disposed on the light - emitting path between the reflection module 3 and the windshield. The second polarization processing module 4 includes a second near - focal polarization unit 41 and a second far - focal polarization unit 42. The second near - focal polarization unit 41 is set to only allow the first polarized light to pass through, and the second far - focal polarization unit 42 is set to only allow the second polarized light to pass through;

[0059] An optical zoom module 9 is located at any position on the light - propagation path between the first polarization processing module 2 and the second polarization processing module 4. The optical zoom module 9 is used to perform zoom processing on at least one of the first polarized light and the second polarized light passing through the first polarization processing module 2, so that the first polarized light is suitable for forming a near - focal virtual image 5 outside the windshield after being reflected by the windshield at a first near - focal position or forming a near - focal real image 7 inside the windshield at a second near - focal position, and also so that the second polarized light forms a far - focal virtual image 6 at a far - focal position outside the windshield after being reflected by the windshield.

[0060] In the optical system provided by the embodiments of the present application, the light rays emitted by the image generating unit 1 are processed by the first polarization processing module 2. Among them, after the near-focus image light rays are processed by the first near-focus polarization unit 21, the near-focus image light rays passing through the first near-focus polarization unit 21 are only the first polarized light, that is, the first near-focus polarization unit 21 has selective transmission for the first polarized light of the near-focus image light rays, and the light rays in other directions in the near-focus image light rays, such as the second polarized light perpendicular to the first polarized light, are absorbed by the first near-focus polarization unit 21 and cannot pass through the first near-focus polarization unit 21; after the far-focus image light rays are processed by the first far-focus polarization unit 22, the far-focus image light rays passing through the first far-focus polarization unit 22 are only the second polarized light, that is, the first far-focus polarization unit 22 has selective transmission for the second polarized light of the far-focus image light rays, and the light rays in other directions in the far-focus image light rays, such as the first polarized light perpendicular to the second polarized light, are absorbed by the first far-focus polarization unit 22 and cannot pass through the first far-focus polarization unit 22. In a possible implementation manner, the first polarized light is P light, the second polarized light is S light, and P light and S light are perpendicular to each other.

[0061] The first polarized light and the second polarized light respectively processed by the first near-focus polarization unit 21 and the first far-focus polarization unit 22 then pass through the reflection module 3. The reflection module 3 is used to fold the optical paths of the first polarized light and the second polarized light. In order to reduce the overall volume of the optical system of the embodiments of the present application, especially to reduce the volume of the reflection module 3, in this embodiment, there may be partial intersection in the optical paths of the first polarized light of the near-focus image light rays and the second polarized light of the far-focus image light rays before passing through the optical zoom module 9. This setting can reduce the actual reflection area in the reflection module 3. Of course, according to actual needs, in other embodiments, the optical paths of the first polarized light and the second polarized light may not intersect before passing through the optical zoom module 9, but this will undoubtedly increase the volume of the reflection module 3 and the overall volume of the optical system compared with the solution where there is partial intersection in the optical paths before passing through the optical zoom module 9.

[0062] Further, it should be specifically explained that in the embodiments of the present application, the so-called non-crossing of the optical path means that there is no crossing phenomenon in the main optical path part. Since the near-focus image light and the far-focus image light have a certain range when emitted, the central part of the two lights (i.e., the part carrying near-focus image information and far-focus graphic information) does not cross, and there may be a certain crossing phenomenon at the edge position. The edge part can be understood as stray light and does not carry graphic information content. Therefore, it will not affect the generation of the near-focus image and the far-focus image. For example, if the emission angles of the near-focus image light and the far-focus image light are both 60°, there may be a 10° range crossing at the edge of the near-focus image light and the far-focus image light. It should be understood that the above content is only for illustrative purposes. For the emission angles of the first light and the second light and the allowable crossing range, as long as the main optical path part does not cross, it is acceptable. In the present application, the non-crossing of the optical path mentioned is the non-crossing of the main optical path as explained above.

[0063] As Figure 1 , Figure 3 , Figure 4 shown, in the embodiments of the present application, the second polarization processing module 4 is disposed on the light emission path between the reflection module 3 and the windshield, and the optical zoom module 9 is located at any position on the light propagation path between the first polarization processing module 2 and the second polarization processing module 4. That is to say, the optical zoom module 9 can be located between the image generating unit 1 and the reflection module 3, the optical zoom module 9 can also be located inside the reflection assembly, and the optical zoom module 9 can also be located between the reflection module 3 and the second polarization processing module 4.

[0064] Specifically, it is allowed that there is partial crossing in the optical path before the first polarized light and the second polarized light enter the optical zoom module 9. If the optical zoom module 9 is disposed between the image generating unit 1 and the reflection module 3, or disposed inside the reflection module 3, the first polarized light and the second polarized light still need to fold the optical path inside the reflection module 3 after zooming, and the central part of the light (i.e., the part carrying near-focus image information and far-focus graphic information) does not cross after being emitted from the optical zoom module 9. Therefore, it is necessary to increase the volume of the reflection module 3; if the optical zoom module 9 is disposed between the reflection module 3 and the second polarization processing module 4, it is also allowed that there is crossing in the optical path before the first polarized light and the second polarized light enter the optical zoom module 9. Therefore, it can be understood that crossing can exist at any position when the light is reflected inside the reflection module 3.

[0065] Therefore, it can be concluded that, compared with the traditional technology, the above three solutions can all achieve the effect of reducing the volume of the display system. When the optical zoom module 9 is disposed on the light exit path between the reflection module 3 and the second polarization processing module 4, it is allowed that the first light ray and the second light ray cross within a wider range. That is to say, in this solution, the optical paths of the first light ray and the second light ray can be folded by the reflection module 3 into a smaller space. Therefore, disposing the optical zoom module 9 on the light propagation path between the reflection module 3 and the second polarization processing module 4 is the optimal solution in the embodiments of the present application.

[0066] As Figure 1 and Figure 2 shown, the first polarized light and the second polarized light are processed by the second polarization processing module 4, so that the first polarized light and the second polarized light are separated from each other. In the above text, the first polarization processing module 2 is equivalent to the "polarization entrance" of the near-focus image light ray and the far-focus image light ray, and the second polarization processing module 4 is equivalent to the "polarization exit" of the near-focus image light ray and the far-focus image light ray. Specifically, the second near-focus polarization unit 41 and the first near-focus polarization unit 21 are correspondingly disposed. When the first polarized light of the near-focus image light ray enters the second near-focus polarization unit 41, since the second near-focus polarization unit 41 is configured to selectively transmit the first polarized light, the first polarized light of the near-focus image light ray can pass through the second near-focus polarization unit 41, while the second polarized light of the far-focus image light ray cannot pass through the second near-focus polarization unit 41 due to polarization processing; the second far-focus polarization unit 42 and the first far-focus polarization unit 22 are correspondingly disposed. When the second polarized light of the far-focus image light ray enters the second far-focus polarization unit 42, since the second far-focus polarization unit 42 is configured to selectively transmit the second polarized light, the second polarized light of the far-focus image light ray can pass through the second far-focus polarization unit 42, while the first polarized light of the near-focus image light ray cannot pass through the second far-focus polarization unit 42 due to polarization processing. Further, the first polarized light of the near-focus image light ray passing through the first near-focus polarization unit 21 is adapted to form a near-focus virtual image 5 at the first near-focus position outside the windshield after being reflected by the windshield. The second polarized light of the far-focus image light ray passing through the second far-focus polarization unit 42 is adapted to form a far-focus virtual image 6 at the far-focus position outside the windshield after being reflected by the windshield. Through the above structure, by adopting a set of reflection module 3 and allowing the near-focus image light ray and the far-focus image light ray to at least partially cross within the reflection module 3, the effect of dual-focus display can be achieved, thereby effectively reducing the volume compared with the dual-focus head-up display in the prior art and providing convenience for the assembly work.

[0067] In this optical system, the optical zoom module 9 can adjust the propagation path of the first polarized light, and can also adjust the propagation path of the second polarized light; of course, it can also be to adjust the propagation paths of both the first polarized light and the second polarized light. The purpose is to ensure that the first polarized light and the second polarized light can be separated, and after being reflected by the windshield, two images at different positions are formed. By adjusting the structure or shape of the optical zoom module 9, the positions of the near-focus virtual image 5 and / or the far-focus virtual image 6 formed by the first polarized light and / or the second polarized light can be changed. Thus, two virtual images with different distances to the eye box 8 can be presented by using a single image generating unit 1 through this optical system, not only achieving the head-up display effect of a dual focal plane, but also achieving the effect of miniaturization.

[0068] In the embodiment of the present application, in order to better separate the first polarized light in the near-focus image light from the second polarized light in the far-focus image light and respectively form the near-focus virtual image 5 and the far-focus virtual image 6. Therefore, the optical zoom module 9 includes a near-focus light-transmitting area 91 and a far-focus light-transmitting area 92; the near-focus light-transmitting area 91 corresponds to the second near-focus polarization unit 41, and the far-focus light-transmitting area 92 corresponds to the second far-focus polarization unit 42. That is to say, the first polarized light after being processed by the second near-focus polarization unit 41 passes through the near-focus light-transmitting area 91 in the optical zoom module 9; the second polarized light after being processed by the second far-focus polarization unit 42 passes through the far-focus light-transmitting area 92 in the optical zoom module 9. Further, it is possible that the first polarized light is zoomed when passing through the near-focus light-transmitting area 91, or it is possible that the second polarized light is zoomed when passing through the far-focus light-transmitting area 92. Of course, it is also possible that both the first polarized light and the second polarized light are zoomed, and it is necessary to ensure that at least one of the first polarized light and the second polarized light is zoomed. It should be particularly emphasized that after being zoomed, the first polarized light and the second polarized light will no longer cross, thereby realizing the separation of the near-focus virtual image 5 and the far-focus virtual image 6.

[0069] In the embodiment of the present application, the near-focus light-transmitting area 91 can converge or diverge the first polarized light in the near-focus image light, or can also not perform any processing; similarly, the far-focus light-transmitting area 92 can converge or diverge the second polarized light in the far-focus image light, or can also not perform any processing. It should be noted that in order to separate the first polarized light of the near-focus light-transmitting area 91 from the second polarized light of the far-focus light-transmitting area 92, at least one of the near-focus light-transmitting area 91 and the far-focus light-transmitting area 92 needs to process the optical path of the light. There is no special limitation on the form of processing the light. It can be that both of them perform refractive convergence processing on the light, or both of them perform refractive divergence processing on the light, or any one of them performs refractive divergence or refractive convergence processing on the light and the other area does not perform any processing; it can also be that any one of the areas performs refractive convergence processing on the passing light and the other area performs refractive divergence processing on the light. When converging or diverging, the shape of the optical zoom module 9 can be adjusted to change the degree of convergence or divergence of the light, thereby realizing the adjustment of the imaging positions of the near-focus virtual image 5 and the far-focus virtual image 6. Since there are numerous combination methods, they will not be listed one by one here.

[0070] Among them, a more preferred solution is that the near-focus light-transmitting area 91 is set to perform refractive divergence processing on the first polarized light, and the far-focus light-transmitting area 92 is set to perform refractive convergence processing on the second polarized light or not perform any processing; it can also be that the far-focus light-transmitting area 92 is set to perform refractive convergence processing on the second polarized light, and the near-focus polarized light 41 is set to perform refractive divergence processing on the first polarized light or not perform any processing. In this way, by diverging the first polarized light, the divergence angle of the first polarized light can be increased. Compared with not performing divergence processing, the near-focus virtual image 5 can be formed closer to the front, and thus the distance between the position of the near-focus virtual image 5 and the windshield can be shortened; similarly, by converging the second polarized light, the divergence angle of the second polarized light can be reduced. Compared with not performing convergence processing, the far-focus virtual image 6 can be formed farther back, and thus the distance between the position of the far-focus virtual image 6 and the windshield can be lengthened.

[0071] In the specific solution in the embodiment of the present application, the near-focus light-transmitting area 91 performs refractive divergence processing on the first polarized light in the near-focus image light, while the far-focus light-transmitting area 92 does not perform any processing on the second polarized light in the far-focus image light.

[0072] In the embodiments of the present application, the optical zoom module 9 includes one or any combination of a single lens, a doublet lens, a multi-lens, or a meta-lens; the lens can be a convex lens or a concave lens. A convex lens has a converging effect on light, while a concave lens has a diverging effect on light. By changing the curvature or the number of lenses, the degree of convergence or divergence of light can be changed, thereby changing the imaging position of light. When it is not necessary to adjust the optical path of light, a flat mirror that can transmit light but does not refract light can be used, or there can be no structure at all, allowing light to pass directly through the air.

[0073] As Figure 1 and Figure 2 shown, in the embodiments of the present application, as the optimal solution of the present application, the near-focus light-transmitting area 91 uses a concave lens to diverge the first polarized light, thereby pulling the near-focus image 5 closer to the windshield, and the far-focus light-transmitting area 92 uses a flat mirror. The near-focus light-transmitting area 91 is attached to the side of the incident light of the second near-focus polarization unit 41, and the far-focus light-transmitting area 92 is attached to the side of the incident light of the second far-focus polarization unit 42.

[0074] As a preferred embodiment of the embodiments of the present application, the concave lens used in the near-focus light-transmitting area 91 is connected and fixed to the flat mirror used in the far-focus light-transmitting area 92. The present application does not impose special restrictions on the connection method between the concave lens and the flat mirror. For example, it can be connected by glue, hot melt welding, or mechanical connection (such as mechanical elements like threads, tenons and mortises, studs, clamps, etc.). The specific positional relationship between the concave lens and the flat mirror is not specially limited either. For example, the convex lens can be installed on the upper surface or the lower surface of the flat mirror, or it can also be installed inside the flat mirror. There can also be a certain gap between the second near-focus polarization unit 41 and the near-focus light-transmitting area 91, and there can also be a certain gap between the second far-focus polarization unit 42 and the far-focus light-transmitting area 92.

[0075] In the embodiments of the present application, in order to make the volume of the image generation unit 1 compact, the present application sets the image generation unit 1 as an integral structure. The image generation unit 1 can be divided into a near-focus light-emitting area and a far-focus light-emitting area. The near-focus light-emitting area is used to emit near-focus image light, and the far-focus light-emitting area is used to emit far-focus image light. The near-focus light-emitting area and the far-focus light-emitting area can be distributed in a left-right manner or in an up-down manner. It can also be understood that there are a near-focus part and a far-focus part distributed, with the near-focus part used to emit near-focus image light and the far-focus part used to emit far-focus image light.

[0076] It can be understood that there are no special restrictions on the image generation unit 1. Any structure that can emit near-focus image light to the first near-focus polarization unit 21 and emit far-focus image light to the first far-focus polarization unit 22 is acceptable.

[0077] In a preferred embodiment of the embodiment of the present application, the first near-focus polarization unit 21 and the first far-focus polarization unit 22 in the first polarization processing module 2 are of a split structure. However, it is not limited thereto. According to actual needs, in other embodiments, the first near-focus polarization unit 21 and the first far-focus polarization unit 22 may also be of an integral structure.

[0078] In the embodiment of the present application, the first near-focus polarization unit 21 is attached to the surface of the near-focus light-emitting area, and the first far-focus polarization unit 22 is attached to the surface of the far-focus light-emitting area. Of course, this is not restrictive. There may be a certain gap between the first near-focus polarization unit 21 and the near-focus light-emitting area, and there may also be a certain gap between the first far-focus polarization unit 22 and the far-focus light-emitting area. The advantage of attaching the first near-focus polarization unit 21 and the first far-focus polarization unit 22 to the surfaces of the near-focus light-emitting area and the far-focus light-emitting area respectively is that there is no need to add other support structures for installing and fixing the first near-focus polarization unit 21 and the first far-focus polarization unit 22. On the one hand, it reduces the manufacturing cost and can also reduce the installation difficulty; on the other hand, it can further reduce the volume and improve the space utilization rate.

[0079] Specifically, the first near-focus polarization unit 21, the first far-focus polarization unit 22, the second near-focus polarization unit 41, and the second far-focus polarization unit 42 are all optical films. Of course, this is not restrictive. As long as it satisfies that among the light rays emitted by the image generation unit 1, only the first polarized light in the near-focus image light rays can pass through the first near-focus polarization unit 21, only the second polarized light in the far-focus image light rays can pass through the first far-focus polarization unit 22, only the first polarized light can pass through the second near-focus polarization unit 41, and only the second polarized light can pass through the second far-focus polarization unit 42, such a structure is acceptable.

[0080] As a preferred embodiment in the embodiment of the present application, the flat mirror is provided with a through hole having the same cross-sectional size as the concave lens. The concave lens is located in the through hole and is connected and fixed to the flat mirror in a glue-bonding manner. The concave lens and the flat mirror are flush on the surface on the light-incident side, and the convex lens protrudes from the inside of the flat mirror on the light-emitting side. It should be noted that according to actual needs, in other embodiments, the convex lens and the flat mirror may not be flush. The second far-focus polarization unit 42 is provided with the same through hole for avoiding the second near-focus polarization unit 41, and the second near-focus polarization unit 41 is just located at the through hole opened by the second far-focus polarization unit 42.

[0081] In a specific embodiment of the present application document, the first polarized light in the near-focus image light is S-polarized light, and the first near-focus polarization unit 21 is an optical thin film that can only transmit S-polarized light; the second polarized light in the far-focus image light is P-polarized light, and the first far-focus polarization unit 22 is an optical thin film that can only transmit P-polarized light; the second near-focus polarization unit 41 and the first near-focus polarization unit 21 are optical thin films made of the same material and have the same effect; the second far-focus polarization unit 42 and the first far-focus polarization unit 22 are optical thin films made of the same material and have the same effect.

[0082] As Figure 1 and Figure 3 As shown, in the embodiment of the present application, the reflection module 3 includes at least one reflection element, and a plurality of reflection elements are staggered between the image production unit and the windshield to achieve the effect of folding the optical path. In the present application, two reflection elements are provided, and the two reflection elements are the first reflection element 31 and the second reflection element 32 respectively. Both the first reflection element 31 and the second reflection element 32 are curved mirrors. Specifically, the first reflection element 31 is adjacent to the first polarization processing module 2, and the second reflection element 32 is adjacent to the second polarization processing module 4.

[0083] In the embodiment of the present application, there is a situation where both the first polarized light and the second polarized light are imaged outside the windshield. The following is the specific content of this situation:

[0084] Situation 1, the first polarized light is imaged at the first near-focus position, and the second polarized light is imaged at the far-focus position. Both the first near-focus position and the far-focus position are located outside the windshield, and thus the images formed are virtual images; the virtual image formed at the first near-focus position is the near-focus virtual image 5, and the virtual image formed at the far-focus position is the far-focus virtual image 6. It can be understood that the reverse extension lines of the first polarized light and the second polarized light after being reflected by the windshield intersect at the first near-focus position and the far-focus position respectively, thereby forming the near-focus virtual image 5 and the far-focus virtual image 6.

[0085] In this situation, the near-focus virtual image 5 and the far-focus virtual image 6 are at least partially fused within the eye box 8, or can be completely fused. There is no special limitation on the form of fusion. It can be understood that the near-focus virtual image can be fused inside the far-focus virtual image 6, or the far-focus virtual image 6 can be fused inside the near-focus virtual image. It can also be that the bottom of one of the near-focus virtual image 5 and the far-focus virtual image 6 is fused to the top of the other, or there is partial fusion at the edges of the two, which can make the overall image more three-dimensional, enrich the effect, and bring a better visual experience.

[0086] Further, at this time, the image information carried by the first polarized light may be the same as the image information carried by the second polarized light, that is, the near-focus virtual image 5 and the far-focus virtual image 6 are the same. In this way, the same virtual image can be formed at two different positions, thereby producing a dynamic zoom visual effect. For example, for a dynamic navigation pointer arrow extending forward, when the virtual image of this dynamic arrow enters the far-focus optical path (the optical path forming the far-focus virtual image 6 can be called the far-focus optical path), it is equivalent to the arrow directly entering the far-focus position of the far-focus optical path from the first near-focus position at the near focus. For the driver's visual perception, it will be that the arrow extends from near to far, and the entire display has a three-dimensional sense of front and back space, thus producing a visual effect similar to dynamic zoom.

[0087] Embodiment 2

[0088] As Figure 5 、 Figure 6 and Figure 7 shown, when changing the structure and quantity of the optical zoom module 9, the imaging position of the first polarized light can be changed. Furthermore, there may be another situation where the first polarized light is imaged inside the windshield, that is, the formed image is a near-focus real image 7. When imaging inside the windshield, the first polarized light can reflect through the windshield to make the imaging position inside the windshield, or it can directly make the imaging position of the light inside the windshield without reflecting through the concave mirror inside the windshield. The following is the specific content of this situation:

[0089] Situation 2: The first polarized light is imaged at the second near-focus position, the second polarized light is imaged at the far-focus position, the second near-focus position is imaged inside the windshield, and the far-focus position is imaged outside the windshield; furthermore, the image formed at the second near-focus position is a real image, and the image formed at the far-focus position is a virtual image; the near-focus real image 7 formed at the second near-focus position, and the image formed at the far-focus position is the far-focus virtual image 6. The distance from the near-focus real image 7 to the eye box 8 is less than the distance from the far-focus virtual image 6 to the eye box 8.

[0090] As a specific application in this situation, the near-focus real image 7 can carry "voice assistant" information to achieve interaction with the driver or passengers in the cab. Further, the "voice assistant" information carried by the near-focus real image 7 can be formed inside the windshield, such as "Genie Assistant" above the instrument panel. This "Genie Assistant" can be a kind of cartoon image, thereby increasing the sense of agility inside the cab. The information carried by the far-focus virtual image 6 can be navigation images, fuel gauges, road conditions, vehicle speeds, etc.

[0091] Embodiment 3

[0092] This application provides a dual-focus head-up display system including the optical system of Embodiment 1 or 2.

[0093] Embodiment 4

[0094] The present application provides a vehicle, including a windshield and the dual-focus head-up display system of Embodiment 3. After being processed by the second polarization processing module 4, the first polarized light of the near-focus image light forms a near-focus virtual image 5 at the first near-focus position outside the windshield after being reflected by the windshield, and the second polarized light of the far-focus image light forms a far-focus virtual image 6 at the far-focus position outside the windshield after being reflected by the windshield.

[0095] Embodiment 5

[0096] The present application provides a vehicle, including a windshield and the dual-focus head-up display system of Embodiment 3. After being processed by the second polarization processing module 4, the first polarized light of the near-focus image light forms a near-focus real image 7 at the second near-focus position inside the windshield after being reflected by the windshield (it may also not pass through the reflection concave mirror of the windshield), and the second polarized light of the far-focus image light forms a far-focus virtual image 6 at the far-focus position outside the windshield after being reflected by the windshield.

[0097] Those skilled in the art can understand that, on the premise of no conflict, the above preferred solutions can be freely combined and superimposed. Among them, the flowcharts and block diagrams in the drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, and this module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order from that marked in the drawings. For example, two consecutive blocks shown may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions. The numbering of the steps in this article is only for convenience of description and reference, and does not limit the sequence before and after. The specific execution sequence is determined by the technology itself, and those skilled in the art can determine various allowed and reasonable sequences according to the technology itself.

[0098] Those skilled in the art can understand that, on the premise of no conflict, the above preferred solutions can be freely combined and superimposed.

[0099] It should be understood that the above embodiments are merely exemplary and not restrictive. Without departing from the basic principles of the present invention, various obvious or equivalent modifications or substitutions made by those skilled in the art to the above details will be included within the scope of the claims of the present invention.

Claims

1. An optical system for a dual-focus head-up display system, characterized in that, Comprising: An image generation unit (1) for emitting near-focus image light rays and far-focus image light rays; A first polarization processing module (2), including a first near-focus polarization unit (21) and a first far-focus polarization unit (22), where the first near-focus polarization unit (21) is used to perform polarization processing on the near-focus image light rays so that only the first polarized light can pass through the near-focus image light rays, and the first far-focus polarization unit (22) is used to perform polarization processing on the far-focus image light rays so that only the second polarized light can pass through the far-focus image light rays, and the polarization directions of the first polarized light and the second polarized light are perpendicular to each other; A reflection module (3) for reflecting the first polarized light and the second polarized light; A second polarization processing module (4) is disposed on the light emission path between the reflection module (3) and the windshield. The second polarization processing module (4) includes a second near-focus polarization unit (41) and a second far-focus polarization unit (42). The second near-focus polarization unit (41) is set to only allow the first polarized light to pass through, and the second far-focus polarization unit (42) is set to only allow the second polarized light to pass through; An optical zoom module (9) is located at any position on the light propagation path between the first polarization processing module (2) and the second polarization processing module (4). The optical zoom module (9) is used to perform zoom processing on at least one of the first polarized light and the second polarized light passing through the first polarization processing module (2), so that the first polarized light is suitable for forming a near-focus virtual image (5) at a first near-focus position outside the windshield or a near-focus real image (7) at a second near-focus position inside the windshield after being reflected by the windshield, and also so that the second polarized light forms a far-focus virtual image (6) at a far-focus position outside the windshield after being reflected by the windshield; When the optical zoom module (9) is located inside the reflection module (3), the reflection module (3) is set to allow the optical paths of the first polarized light and the second polarized light to cross before entering the optical zoom module (9); When the optical zoom module (9) is located on the light emission path of the reflection module (3), the reflection module (3) is set to allow the optical paths of the first polarized light and the second polarized light to cross at any position inside the reflection module (3).

2. The optical system for a dual-focal-plane head-up display system according to claim 1, wherein: The optical zoom module (9) includes a near-focus light transmission area (91) and a far-focus light transmission area (92). The near-focus light transmission area (91) corresponds to the second near-focus polarization unit (41), and the far-focus light transmission area (92) corresponds to the second far-focus polarization unit (42); The near-focus light transmission area (91) is set to perform zoom processing on the first polarized light, and / or the far-focus light transmission area (92) is set to perform zoom processing on the second polarized light.

3. The optical system for a dual-focus head-up display system according to claim 2, wherein, The near-focus light transmission area (91) is set to perform refractive divergence processing on the first polarized light, and / or the far-focus light transmission area (92) is set to perform refractive convergence processing on the second polarized light.

4. The optical system for a dual-focal-plane head-up display system according to claim 1, wherein: The optical zoom module (9) comprises one or any combination of a single lens, a doublet lens, a multi-lens or a super lens.

5. The optical system for a dual-focus head-up display system according to any one of claims 2, characterized in that, The near-focus light-transmitting area (91) is attached to a side of the second near-focus polarization unit (41) toward which the first polarized light and the second polarized light are incident, and / or the far-focus light-transmitting area (92) is attached to a side of the second far-focus polarization unit (42) toward which the first polarized light and the second polarized light are incident.

6. The optical system for a dual-focal-plane head-up display system according to any one of claims 1 to 5, characterized in that: The image generating unit (1) is arranged in an integrated manner, comprising a near-focus light emitting area for emitting the near-focus image light and a far-focus light emitting area for emitting the far-focus image light.

7. The optical system for a dual-focus head-up display system according to claim 6, characterized in that, The first near-focus polarization unit (21) is attached to the near-focus luminous area, and / or the first far-focus polarization unit (22) is attached to the far-focus luminous area.

8. A dual-focus head-up display system, characterized in that, The optical system comprises the optical system according to any one of claims 1 to 7.

9. A vehicle, characterized in that, The invention comprises a windshield and the dual-focal-plane head-up display system according to claim 8.

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