Head-up display device and vehicle

Abstract

The application provides a head-up display device and a vehicle. The head-up display device comprises, in sequence along a projection light ray propagation direction: an image generation unit for generating an image, the image generation unit comprising a projection lens, the projection lens comprising at least one set of movable lens groups, the movable lens groups moving along the projection light ray propagation direction; a diffusion screen configured to move an image plane of the image generation unit along the projection light ray propagation direction to receive the image generated by the image generation unit; a moving distance of the diffusion screen is less than a depth of field of the projection lens, and a moving distance of the movable lens groups is less than the moving distance of the diffusion screen; a mirror assembly and a transparent medium, the mirror assembly being configured to reflect the projection light from the diffusion screen to the transparent medium to form a virtual picture with different virtual image distances in front of the transparent medium.

Description

Technical Field

[0001] This application relates to the field of head-up display technology, and more specifically, to a head-up display device and a vehicle. Background Technology

[0002] A head-up display (HUD), also known as a parallel display system, projects important driving information such as speed and navigation onto the windshield in front of the driver, allowing the driver to see this information without looking down or turning their head.

[0003] Traditional HUD systems are limited to a single, fixed-location image source, and therefore can only generate virtual images located at a fixed distance, unable to adjust the virtual image distance according to the driver's line of sight or driving conditions.

[0004] In view of this, a new technical solution is needed to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this application is to provide a head-up display device and a new technology solution for vehicles.

[0006] In a first aspect, embodiments of this application provide a head-up display device. The head-up display device comprises, along the direction of projection light propagation, the following components in sequence:

[0007] An image generating unit is used to generate an image. The image generating unit includes a projection lens, which includes at least one set of movable lens groups that move along the propagation direction of the projected light rays.

[0008] A diffuser screen is configured to move along the propagation direction of the projected light rays to the image plane of the image generating unit to receive the image generated by the image generating unit; the moving distance of the diffuser screen is less than the depth of field of the projection lens, and the moving distance of the movable lens group is less than the moving distance of the diffuser screen.

[0009] A reflector assembly and a transparent medium, wherein the reflector assembly is used to reflect the projected light from the diffuser screen onto the transparent medium to form a virtual image with a different virtual image distance in front of the transparent medium.

[0010] Optionally, the projection lens is composed of a positive focal length lens group, which serves as a movable lens group of the projection lens.

[0011] Optionally, the projection lens includes at least one group of positive power lenses and at least one group of negative power lenses. The positive power lenses are fixedly arranged, and at least one group of negative power lenses is configured to move along the direction of projection light propagation.

[0012] Optionally, the image generating unit further includes a display chip, and one of the negative power lens groups is configured to be movable along the projection propagation direction;

[0013] The negative power lens group is positioned closest to the display chip, or the negative power lens group is positioned furthest from the display chip.

[0014] Optionally, the projection lens includes at least two sets of negative power lenses, at least two of which are configured to move along the direction of projection light propagation.

[0015] Optionally, the two sets of negative power lens groups that move along the direction of projection light propagation are arranged at intervals, and at least one set of positive power lens groups is arranged between them.

[0016] Optionally, the projection lens includes at least one group of positive power lenses and at least one group of negative power lenses, wherein at least one group of the positive power lenses is configured to move along the direction of projection light propagation and at least one group of the negative power lenses is configured to move along the direction of projection light propagation.

[0017] Optionally, the projection lens includes a set of positive power lenses and a set of negative power lenses that move along the direction of projection light propagation. The positive power lenses and the negative power lenses are arranged adjacent to each other, or the positive power lenses and the negative power lenses are arranged at intervals, with at least one set of lenses between them.

[0018] Optionally, the direction of movement of the positive power lens group is opposite to the direction of movement of the negative power lens group.

[0019] Secondly, embodiments of this application also provide a vehicle. The vehicle includes a head-up display device as described in the first aspect.

[0020] According to embodiments of this application, through the synergistic effect of the movable lens group, diffuser screen, reflector assembly, and transparent medium optical elements in the projection lens, virtual images with different virtual image distances and high clarity can be formed in front of the transparent medium at different times. Compared to HUD systems that present virtual images with a fixed virtual image distance, embodiments of this application, through focusing of the Fresnel lens group and adjusting the position of the diffuser screen, can provide the driver with clear virtual images with different virtual image distances.

[0021] Other features and advantages of this specification will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of this specification.

[0023] Figure 1 The diagram shown is a structural schematic of the head-up display device provided in an embodiment of this application.

[0024] Figure 2 The image shows a first-order movement scheme for the movable lens group in the head-up display device provided in this application embodiment.

[0025] Figure 3 The image shows a second method for moving the movable lens group in a head-up display device provided in this application embodiment.

[0026] Figure 4 The image shows a third method for moving the movable lens group in the head-up display device provided in this application embodiment.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Image generating unit; 10. Display chip; 11. Projection lens; 111. Positive power lens group; 112. Negative power lens group;

[0029] 2. Diffuser screen; 3. Reflector assembly; 4. Transparent medium. Detailed Implementation

[0030] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0031] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0032] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0033] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0035] A head-up display (HUD) is a technology that projects information as light onto a vehicle's windshield or in front of the driver's line of sight, allowing the driver to obtain the information they need without looking down at the dashboard. This device is particularly common in automobiles and is designed to improve driving safety and convenience.

[0036] The virtual image distance of the virtual image generated by existing HUD systems cannot be adjusted; that is, the virtual image distance for the same HUD is fixed and cannot be adjusted in real time according to actual driving conditions. Furthermore, with the diversification of user needs, there is a requirement to present virtual images with different virtual image distances at different times, depending on actual driving conditions; however, adjusting the position of the virtual image may affect the image clarity. Traditional head-up displays cannot present clear images with different virtual image distances at different times.

[0037] Therefore, this application provides a head-up display device.

[0038] In the embodiments of this application, reference is made to Figure 1 The head-up display device includes, in sequence along the direction of the projection light propagation, an image generating unit 1, a diffuser screen 2, a reflector assembly 3, and a transparent medium 4.

[0039] Reference Figures 1-4 The image generating unit 1 includes a projection lens 11, which includes at least one set of movable lens groups that move along the propagation direction of the projected light rays.

[0040] Reference Figures 1-4 The diffuser screen 2 is configured to move along the propagation direction of the projection light to the image plane of the image generating unit 1 to receive the image generated by the image generating unit 1; the moving distance of the diffuser screen 2 is less than the depth of field of the projection lens 11, and the moving distance of the movable lens group is less than the moving distance of the diffuser screen 2.

[0041] Reference Figure 1 The reflector assembly 3 is used to reflect the projected light from the diffuser screen 2 onto the transparent medium 4 to form virtual images with different virtual image distances in front of the transparent medium 4.

[0042] Now, we will analyze in detail the main components of the head-up display device along the direction of the projected light propagation: image generation unit 1, diffuser screen 2, reflector assembly 3, and transparent medium 4.

[0043] Image generation unit 1 is responsible for generating the information or image to be displayed. Image generation unit 1 can display different or the same information or image at different times. Image generation unit 1 can use other display technologies such as LCD, DLP, or LBS to create images. The images generated by image generation unit 1 typically contain key driving information such as vehicle speed, navigation instructions, and safety warnings. Displays such as LCD, DLP, or LBS typically include a lighting component, a display chip 10 (DMD, LCOS, or micro LED, etc.), and a projection lens 11, meaning that image generation unit 1 is a projection-type PGU.

[0044] Reference Figures 1-4 From the structure of the image generating unit 1 provided in this application, the image generating unit 1 mainly includes a projection lens 11. The projection lens 11 includes at least one set of movable lens groups, which are used to adjust the focal length of the projection lens 11 so that the image plane position of the image generating unit 1 presents a clear image.

[0045] In other words, the projection lens 11 of this application can adjust its focal length by setting at least one set of movable lens groups. This allows the HUD system to adjust the distance of the virtual image as needed to adapt to the different driving requirements and driving environments of different drivers.

[0046] The movable lens group can be a positive power lens group 111 and / or a negative power lens group 112.

[0047] In one example, refer to Figure 2 The movable lens group is a positive power lens group 111. The positive power lens group 111 has the characteristic of converging light rays, causing light rays to tend towards a common point (focal point) after passing through the lens. When the movable lens group is a positive power lens group 111 (e.g....), Figure 2 As shown in the figure, it helps to form a clear image at a greater distance. That is, in this embodiment, the image plane of the projection lens 11 is located at a greater distance, and the diffuser screen 2 is moved accordingly to the image plane position of the image generating unit 1.

[0048] In another example, refer to Figure 3 The movable lens group is a negative power lens group 112. Unlike the positive power lens group 111, the negative power lens group 112 has the characteristic of diverging light rays. This lens group forms a clear image at closer distances (e.g., ...). Figure 3 (As shown). That is, in this embodiment, the image plane of the projection lens 11 is relatively close, and the diffuser screen 2 is moved accordingly to the image plane position of the image generating unit 1.

[0049] In yet another example, refer to Figure 4The movable lens group consists of a positive power lens group 111 and a negative power lens group 112. When the movable lens group simultaneously includes both positive and negative power lenses (e.g....) Figure 4 As shown, the system can adjust the focal length more flexibly to adapt to a wider range of driver visibility needs and driving environments.

[0050] The diffuser screen 2 is located after the image generating unit 1, specifically at the image plane of the image generating unit 1. The diffuser screen 2 is used to diffuse the light generated by the image generating unit 1. The diffuser screen 2 is designed to move along the direction of the projected light propagation, and its position is located at the image plane of the image generating unit 1. This means that the diffuser screen 2 can receive the image generated by the image generating unit 1 and further diffuse or project it into the driver's line of sight. By precisely adjusting the position of the diffuser screen 2, it can be ensured that it accurately receives the image generated by the image generating unit 1, thereby maintaining the image's clarity and integrity.

[0051] In other words, by moving the diffuser screen 2, the head-up display device can adjust the distance between the diffuser screen 2 and the projection lens 11 in the image generation unit 1. This adjustment can change the incident angle and diffusion range of light on the diffuser screen 2, thereby affecting the clarity of the image.

[0052] In addition to optimizing imaging, the mobility of the diffuser screen 2 allows the head-up display device to adjust the distance between the diffuser screen 2 and the reflector assembly 3. This adjustment can change the reflection angle and path of light on the reflector, thereby affecting the virtual image distance of the virtual image formed on the transparent medium 4 (such as a windshield or a specially designed screen). For example, see reference... Figure 1 The head-up display device can form virtual images with different virtual distances and high definition between positions 1a and 1b at different times. The image formed at position 1a is a far virtual distance image, and the image formed at position 1b is a near virtual distance image.

[0053] For example, the movement of the diffuser screen 2 can be achieved through mechanical structures (such as guide rails, sliders, etc.), which ensure that the diffuser screen 2 can move smoothly and accurately.

[0054] For example, the mechanical structure used to move the diffuser screen 2 also includes a drive device (such as a motor, stepper motor, etc.) to provide the power required for the movement.

[0055] Furthermore, in this embodiment, the moving distance of the diffuser screen 2 and the moving distance of the movable lens group are also limited.

[0056] The movement distance of the diffuser screen 2 is specifically designed to be less than the depth of field of the projection lens 11. This means that although the diffuser screen 2 is moving, the image it receives remains relatively clear because its movement range is within the depth of field. In other words, by limiting the movement distance of the diffuser screen 2 to within the depth of field, the system can flexibly adjust the position of the diffuser screen 2 while maintaining image clarity to adapt to different driving environments and driver needs.

[0057] The movable lens group's movement distance is designed to be less than that of the diffusion screen 2. This means that when focal length adjustment is required, the movement of the lens group is more precise and subtle, ensuring that the image plane of the image generation unit 1 is accurately focused on the diffusion screen 2. By limiting the movement distance of the lens group, the system can achieve more precise focal length adjustment, thereby ensuring that the generated image exhibits optimal sharpness and quality on the diffusion screen 2.

[0058] For example, the moving distance of the movable lens group is often much smaller than the moving distance of the diffuser screen 2. For example, refer to... Figure 1 The moving distance of the diffuser 2 is the distance between positions 2a and 2b, which ranges from 20mm to 120mm. The moving distance of the movable lens group, however, is often only a few tenths of a millimeter or a few millimeters. For example, the moving distance of the movable lens group is less than 10mm.

[0059] The reflector assembly 3 is the part of the head-up display device responsible for guiding image light to the front of the driver's line of sight. The reflector assembly 3 may include at least one optical element such as a reflector, a refractor, or a lens. These elements work together to focus the image light and project it onto a transparent medium 4 (such as a windshield). Specifically, at different times, when the transparent medium 4 is away from the driver's eyes, it can display virtual images with different virtual image distances.

[0060] In this embodiment, the reflector assembly 3 may include one or two reflectors, as shown in the reference. Figure 1 The reflector assembly 3 includes a reflector. The reflector is used to receive the projection light emitted from the diffuser screen 2 and reflect the projection light to the transparent medium 4. The transparent medium 4 forms a virtual image in front of the viewer, and the virtual image distance varies depending on the different settings of the diffuser screen 2.

[0061] In the head-up display device provided in this application embodiment, through the coordinated action of the movable lens group in the projection lens 11, the diffuser screen 2, the reflector assembly 3, and the optical elements of the transparent medium 4, virtual images with different virtual image distances and high clarity can be formed in front of the transparent medium 4 at different times. Compared with HUD systems that present virtual images with a fixed virtual image distance, this application embodiment can provide the driver with clear virtual images with different virtual image distances by adjusting the focus of the Fresnel lens group and the setting position of the diffuser screen 2.

[0062] According to one embodiment of this application, refer to Figure 2 The projection lens 11 is composed of a positive focal length lens group 111, which serves as a movable lens group of the projection lens 11.

[0063] In this embodiment, the projection lens 11 includes only one set of positive focal length lens group 111. When the diffuse screen 2 moves along the direction of projection light propagation (for example, from position 2a to position 2b), without considering the image quality, the image formed by the head-up display device through the transparent medium 4 is adjusted from a far virtual image distance image to a near virtual image distance image, that is, the position of the blurred image is adjusted from position 1a to position 1b.

[0064] Specifically, when the diffuser screen 2 moves from position 2a to position 2b, since the position of the reflector assembly 3 is relatively fixed, the angle and transmission path of the projection light emitted from the diffuser screen 2 onto the reflector assembly 3 will also change when the position of the diffuser screen 2 is adjusted. Therefore, the position of the virtual image (i.e., the position where the driver sees the image) will also change. Specifically, the virtual image will be adjusted from a farther distance (position 1a) to a closer distance (position 1b), that is, the adjustment from a far virtual image distance to a near virtual image distance is achieved.

[0065] To ensure image clarity, when the diffuser screen 2 moves from a position away from the reflector assembly 3 (position 2a) to a position closer to the reflector assembly 3 (position 2b), the positive focal length lens group 111 can move from a position closer to the display chip 10 to a position farther away from the display chip 10. The direction of movement of the positive focal length lens group 111 is the same as the direction of movement of the diffuser screen 2.

[0066] Specifically, moving the position of the diffuser 2 changes the position of the virtual image, but may also lead to a decrease in image quality, such as changes in brightness, contrast, and sharpness. The adjustment of the positive focal length lens group 111 is designed to compensate for these changes, ensuring that the image quality remains sharp when the position of the diffuser 2 changes.

[0067] It should be emphasized that in this embodiment, the positive power lens group 111 of the projection lens 11 has a large number of lenses and is often quite heavy. To reduce the burden on the motor providing the moving power, a dedicated focusing group can be designed, which is the negative power lens group 112, such as... Figure 3 As shown.

[0068] It should be noted that, Figure 2 The direction of movement of the positive power lens group 111 is only shown, and the specific number of lenses or lens structure of the positive power lens group 111 is not specifically limited.

[0069] The following is about Figure 3 The proposed movement scheme for the movable lens group is described.

[0070] According to one embodiment of this application, refer to Figure 3 The projection lens 11 includes at least one positive power lens group 111 and at least one negative power lens group 112. The positive power lens group 111 is fixedly arranged, and at least one of the negative power lens groups 112 is configured to be movable along the direction of projection light propagation.

[0071] In this embodiment, the projection lens 11 includes at least one set of positive power lens group 111 and at least one set of negative power lens group 112, wherein at least one set of negative power lens group 112 serves as a movable lens group of the projection lens 11.

[0072] For example, the projection lens 11 includes a set of negative power lens groups 112, which serve as a movable lens group of the projection lens 11.

[0073] For example, the projection lens 11 includes two or more negative power lens groups 112, and one or more of the negative power lens groups 112 serve as a movable lens group of the projection lens 11.

[0074] As the diffused screen 2 moves along the direction of the projected light propagation (for example, from position 2a to position 2b), without considering the image quality, the image formed by the head-up display device through the transparent medium 4 is adjusted from a far virtual image distance image to a near virtual image distance image, that is, the position of the blurred image is adjusted from position 1a to position 1b.

[0075] To ensure image clarity, when the diffuser screen 2 moves from a position away from the reflector assembly 3 (position 2a) to a position closer to the reflector assembly 3 (position 2b), a set of negative power lens groups 112 can be moved, or two or more sets of negative power lens groups 112 can be moved in coordination, so that the image of the diffuser screen 2 is clear.

[0076] For example, when the projection lens 11 includes a movable negative power lens group 112, when the diffuser screen 2 moves from a position away from the reflector assembly 3 (position 2a) to a position close to the reflector assembly 3 (position 2b), the moving direction of the negative power lens group 112 is opposite to the moving direction of the diffuser screen 2.

[0077] That is, when the diffuser 2 moves from a position away from the reflector assembly 3 (position 2a) to a position close to the reflector assembly 3 (position 2b), the negative power lens group 112 moves from a position away from the display chip 10 to a position close to the display chip 10.

[0078] It should be noted that, Figure 3 The positions of the positive power lens group 111 and the negative power lens group 112, as well as the direction of movement of the negative power lens group 112, are shown. No specific limitations are made on the number of lenses or the lens structure of the positive power lens group 111 and the negative power lens group 112.

[0079] When the projection lens 11 includes at least one set of positive power lens groups 111 and at least one set of negative power lens groups 112, and one of the negative power lens groups 112 serves as a movable lens group of the projection lens 11, the placement position of the movable negative power lens group 112 is defined. The image generating unit 1 further includes a display chip 10, and the movable negative power lens group 112 is positioned either closest to the display chip 10 or furthest away from the display chip 10.

[0080] In one example, when the negative power lens group 112 is closest to the display chip 10, it can directly diffuse the light emitted from the display chip 10, which is more direct and effective for adjusting the degree of light diffusion and focal length. This setup is suitable for devices that require high flexibility to adjust image size and focal length, because the diffusion and focusing characteristics of light can be quickly changed by moving this lens group.

[0081] In another example, positioning the negative focal length lens group 112 furthest from the display chip 10 allows it to play a final adjustment role in the optical path. This facilitates fine-tuning of the final focal length and image quality after the light has passed through other lens groups. This setup may be more suitable for devices with extremely high image quality requirements and that need precise control over light diffusion and focusing.

[0082] The projection lens 11 includes at least one set of positive power lens group 111 and at least one set of negative power lens group 112, with at least two of the negative power lens group 112 serving as movable lens groups of the projection lens 11. That is, at least two of the negative power lens group 112 are configured to be movable along the direction of projection light propagation.

[0083] In this embodiment, by using at least two sets of negative lens groups together, more precise focusing can be achieved, providing greater magnification and optimized aberration correction.

[0084] Specifically, by moving the negative power lens group 112, the effective focal length of the entire projection lens 11 can be changed, thereby achieving sharp focus on the projected image. Multiple movable negative power lens groups 112 can provide finer focus adjustment, especially in applications requiring rapid and continuous focus adjustment.

[0085] Furthermore, the magnification of the projected image can be adjusted by changing the position of the movable lens group, which is very useful for adjusting the size of the projected image. Multiple movable lens groups can provide a wider range of magnification adjustment while maintaining image quality.

[0086] Furthermore, aberrations in the projection lens 11 (such as spherical aberration, coma, field curvature, etc.) can be corrected by precisely moving the lens group. Multiple movable lens groups provide more degrees of freedom to optimize aberration correction.

[0087] When the projection lens 11 includes at least one set of positive power lens groups 111 and at least two sets of negative power lens groups 112, and at least two of the negative power lens groups 112 serve as movable lens groups of the projection lens 11, the placement position of the movable negative power lens group 112 is defined. The two sets of negative power lens groups 112 that move along the direction of projection light propagation are spaced apart, and at least one set of positive power lens groups 111 is placed between them.

[0088] In this embodiment, the two sets of negative power lens groups 112, which move along the direction of projection light propagation, are spaced apart, meaning they should be at a certain distance from each other rather than being closely adjacent. This spacing provides more space to adjust the position of the lens groups, thereby achieving finer control over focal length, magnification, and aberrations.

[0089] Furthermore, at least one positive power lens group 111 should be provided between the two movable negative power lens groups 112. The positive power lens group 111 can converge light, which helps to improve image sharpness and contrast. At the same time, the presence of the positive power lens group 111 can also provide additional aberration correction capability for the two negative power lens groups 112, making the overall performance of the projection lens 11 superior.

[0090] It should be noted that, according to Figure 3 When only the negative power lens group 112 is used as a movable lens group of the projection lens 11, the focusing range of the negative power lens group 112 is relatively small. For example, based on a projection distance of 130mm, the focusing range is often no more than ±40mm. To increase the focusing travel length, a dual-group linkage focusing method can be adopted, such as... Figure 4 As shown.

[0091] The following is about Figure 4 The proposed movement scheme for the movable lens group is described.

[0092] According to one embodiment of this application, refer to Figure 4 The projection lens 11 includes at least one positive power lens group 111 and at least one negative power lens group 112. At least one of the positive power lens groups 111 is configured to move along the direction of projection light propagation, and at least one of the negative power lens groups 112 is configured to move along the direction of projection light propagation.

[0093] In this embodiment, the projection lens 11 includes at least one set of positive power lens group 111 and at least one set of negative power lens group 112, wherein at least one set of negative power lens group 112 serves as a movable lens group of the projection lens 11, and at least one set of positive power lens group 111 also serves as a movable lens group of the projection lens 11.

[0094] As the diffused screen 2 moves along the direction of the projected light propagation (for example, from position 2a to position 2b), without considering the image quality, the image formed by the head-up display device through the transparent medium 4 is adjusted from a far virtual image distance image to a near virtual image distance image, that is, the position of the blurred image is adjusted from position 1a to position 1b.

[0095] To ensure image clarity, when the diffuser screen 2 moves from a position away from the reflector assembly 3 (position 2a) to a position closer to the reflector assembly 3 (position 2b), the negative power lens group 112 and the positive power lens group 111 can be moved simultaneously (i.e., the positive power lens group 111 and the negative power lens group 112 move together) to make the image of the diffuser screen 2 clear. Alternatively, the movement of the positive power lens group 111 may cause a change in the back focus, and the negative power lens group 112 can be used to refocus the image so that the diffuser screen 2 can obtain a clear image during the movement from position 2a to position 2b.

[0096] In this example, using two sets of lenses, one positive and one negative, to focus the projection lens 11 can improve the focusing range. For example, based on a projection distance of 130mm, the focusing range can reach ±60mm.

[0097] It should be noted that, Figure 4 The document only shows the positions of the positive power lens group 111 and the negative power lens group 112, as well as the directions of movement of the positive power lens group 111 and the negative power lens group 112. It does not specify the specific number of lenses or the lens structure of the positive power lens group 111 and the negative power lens group 112.

[0098] In this embodiment, reference is made to Figure 4 The projection lens 11 includes a set of positive power lens group 111 and a set of negative power lens group 112 that move along the direction of projection light propagation. The positive power lens group 111 and the negative power lens group 112 are arranged adjacent to each other, or the positive power lens group 111 and the negative power lens group 112 are arranged at intervals, and at least one lens group is arranged between them.

[0099] In one example, the positive power lens group 111 and the negative power lens group 112 are closely spaced, with no other lens groups inserted between them. This configuration can be used in projection lenses 11 where a compact design is required, and where space constraints are a key factor. The adjacent positive and negative lens groups can be moved in coordination to correct specific aberrations, such as chromatic aberration or spherical aberration.

[0100] In another example, at least one additional lens group is provided between the positive optical power lens group 111 and the negative optical power lens group 112. This additional lens group can be of positive optical power, negative optical power, or a combination of both, depending on the needs of the lens design. This spacing provides greater design flexibility and can be used to achieve more complex aberration corrections, focal length adjustments, or magnification changes.

[0101] Whether in adjacent or spaced configurations, the combination of positive power lens group 111 and negative power lens group 112 can be used to adjust focal length and magnification. Spaced configurations offer a wider range of adjustments because the additional lens groups provide additional correction and focusing capabilities.

[0102] In this embodiment, the moving direction of the positive power lens group 111 is opposite to the moving direction of the negative power lens group 112.

[0103] In this embodiment, the positive power lens group 111 has a converging effect on light and is typically used to focus light more precisely. The negative power lens group 112 has a diverging effect on light and is typically used to adjust the degree of light diffusion.

[0104] In projection lens 11, to achieve a clear projection effect, the focal length of the lens needs to be adjusted. This is usually done by moving the lens group.

[0105] When the focal length needs to be adjusted, the positive focal length lens group 111 and the negative focal length lens group 112 move along the direction of propagation of the projected light rays. However, the two lens groups move in opposite directions. If the positive focal length lens group 111 moves forward to increase the converging effect, then the negative focal length lens group 112 will typically move backward to reduce the diverging effect, or vice versa.

[0106] This opposite movement is to maintain the balance and focusing effect of the light inside the lens. By precisely adjusting the positions of these two sets of lenses, a clear projected image can be achieved at the image plane position of image generation unit 1.

[0107] This application also provides a vehicle. The vehicle includes the head-up display device as described above.

[0108] The specific implementation of the vehicle in this application embodiment can refer to the above-described embodiments of the head-up display device, and therefore has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0109] The above embodiments mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.

[0110] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A head-up display device, characterized in that, Along the direction of propagation of the projected light rays, the following are included in sequence: An image generating unit (1) is used to generate an image. The image generating unit (1) includes a projection lens (11). The projection lens (11) includes at least one set of movable lens groups, which move along the propagation direction of the projected light rays. A diffuser screen (2) is configured to move along the propagation direction of the projection light to the image plane of the image generating unit (1) to receive the image generated by the image generating unit (1); the moving distance of the diffuser screen (2) is less than the depth of field of the projection lens (11), the moving distance of the movable lens group is less than the moving distance of the diffuser screen (2), the moving distance of the diffuser screen (2) is in the range of 20mm to 120mm, and the moving distance of the movable lens group is less than 10mm; A reflector assembly (3) and a transparent medium (4), wherein the reflector assembly (3) is used to reflect the projection light from the diffuser screen (2) to the transparent medium (4) to form a virtual image with a different virtual image distance in front of the transparent medium (4).

2. The head-up display device according to claim 1, characterized in that, The projection lens (11) is composed of a positive focal length lens group (111), which serves as a movable lens group of the projection lens (11).

3. The head-up display device according to claim 1, characterized in that, The projection lens (11) includes at least one positive power lens group (111) and at least one negative power lens group (112). The positive power lens group (111) is fixedly set, and at least one of the negative power lens groups (112) is configured to be movable along the direction of projection light propagation.

4. The head-up display device according to claim 3, characterized in that, The image generating unit (1) further includes a display chip (10), and one of the negative power lens groups (112) is configured to move along the projection propagation direction; The negative power lens group (112) is located closest to the display chip (10), or the negative power lens group (112) is located furthest from the display chip (10).

5. The head-up display device according to claim 3, characterized in that, The projection lens (11) includes at least two sets of negative power lens groups (112), at least two of which are configured to move along the direction of projection light propagation.

6. The head-up display device according to claim 5, characterized in that, Two sets of negative power lens groups (112) that move along the direction of projection light propagation are arranged at intervals, and at least one set of positive power lens groups (111) is arranged between them.

7. The head-up display device according to claim 1, characterized in that, The projection lens (11) includes at least one positive power lens group (111) and at least one negative power lens group (112), wherein at least one of the positive power lens groups (111) is configured to be movable along the direction of projection light propagation and at least one of the negative power lens groups (112) is configured to be movable along the direction of projection light propagation.

8. The head-up display device according to claim 7, characterized in that, The projection lens (11) includes a set of positive power lens group (111) and a set of negative power lens group (112) that move along the direction of projection light propagation. The positive power lens group (111) and the negative power lens group (112) are arranged adjacent to each other, or the positive power lens group (111) and the negative power lens group (112) are arranged at intervals, and at least one lens group is arranged between them.

9. The head-up display device according to claim 7 or 8, characterized in that, The direction of movement of the positive power lens group (111) is opposite to the direction of movement of the negative power lens group (112).

10. A vehicle, characterized in that, The vehicle includes a head-up display as claimed in any one of claims 1-9.

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