Head-up display device and vehicle

Abstract

The invention provides a head-up display device and a vehicle. The head-up display device sequentially comprises an image generation unit used for generating an image along a projection light ray propagation direction, the image generation unit comprises a projection lens, the projection lens comprises at least one movable lens group, and the movable lens group moves along the projection light ray propagation direction; the diffusion screen is configured to move in an image plane of the image generation unit along the propagation direction of the projection light so as to receive an image generated by the image generation unit; the moving distance of the diffusion screen is smaller than the depth of field of the projection lens, and the moving distance of the movable lens group is smaller than the moving distance of the diffusion screen; the reflector assembly is used for reflecting the projection light rays from the diffusion screen to the transparent medium, so that virtual pictures with different virtual image distances are formed in front of the transparent medium.

Description

Technical Field

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

[0002] Head-up display is abbreviated as HUD, also known as parallel display system. HUD can project important driving information such as speed and navigation onto the windshield in front of the driver, allowing the driver to see important driving information such as speed and navigation without lowering or turning his head.

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

[0004] In view of this, it is necessary to provide a new technical solution to solve the above technical problems. Summary of the invention

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

[0006] In a first aspect, an embodiment of the present application provides a head-up display device. The head-up display device includes, in order along the propagation direction of the projection light:

[0007] An image generating unit, used for generating an image, wherein the image generating unit comprises a projection lens, wherein the projection lens comprises at least one movable lens group, and the movable lens group moves along a propagation direction of the projection light;

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

[0009] A reflector assembly and a transparent medium, wherein the reflector assembly is used to reflect the projection light from the diffusion screen to the transparent medium, so as to form a virtual picture with different virtual image distances in front of the transparent medium.

[0010] Optionally, the projection lens is composed of a positive power lens group, and the positive power lens group serves as a movable lens group of the projection lens.

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

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

[0013] The negative optical focal length lens group is disposed closest to the display chip, or the negative optical focal length lens group is disposed farthest from the display chip.

[0014] Optionally, the projection lens comprises at least two groups of negative optical power lens groups, and at least two of the negative optical power lens groups are configured to be movable along the propagation direction of the projection light.

[0015] Optionally, two groups of negative optical power lens groups moving along the propagation direction of the projection light are arranged at an interval, and at least one group of positive optical power lens group is arranged between the two.

[0016] Optionally, the projection lens includes at least one group of positive optical focal length lens groups and at least one group of negative optical focal length lens groups, at least one group of the positive optical focal length lens groups is configured to be able to move along the propagation direction of the projection light, and at least one group of the negative optical focal length lens groups is configured to be able to move along the propagation direction of the projection light.

[0017] Optionally, the projection lens includes a group of positive optical focal length lens groups and a group of negative optical focal length lens groups moving along the propagation direction of the projection light, and the positive optical focal length lens group and the negative optical focal length lens group are arranged adjacent to each other, or the positive optical focal length lens group and the negative optical focal length lens group are arranged at intervals, and at least one lens group is arranged between the two.

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

[0019] In a second aspect, an embodiment of the present application further provides a vehicle, wherein the vehicle comprises the head-up display device as described in the first aspect.

[0020] According to the embodiment of the present application, through the synergistic effect of the movable lens group, the diffusion screen, the reflector assembly and the transparent medium optical element in the projection lens, a virtual image with different virtual image distances and high clarity can be formed in front of the transparent medium at different times. Compared with the HUD system that presents a virtual image with a fixed virtual image distance, the embodiment of the present application can provide the driver with a clear virtual image with different virtual image distances through the focus adjustment of the Fresnel lens group and the adjustment of the setting position of the diffusion screen.

[0021] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0024] Figure 2 The figure shows a first moving scheme of the movable lens group in the head-up display device provided in an embodiment of the present application.

[0025] Figure 3 The figure shows a second moving scheme of the movable lens group in the head-up display device provided in the embodiment of the present application.

[0026] Figure 4 The figure shows the third moving scheme of the movable lens group in the head-up display device provided in the embodiment of the present application.

[0027] Description of reference numerals:

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

[0029] 2. Diffuser screen; 3. Reflector assembly; 4. Transparent medium. DETAILED DESCRIPTION

[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 of components and steps, numerical expressions and numerical values ​​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 in nature and is in no way intended to limit the present application, its application, or uses.

[0032] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

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

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

[0035] Head-Up Display (HUD) is a technology that projects information in the form of light onto the vehicle windshield or in front of the driver's line of sight, allowing the driver to obtain the required information without having to look down at the dashboard. This device is particularly common in car driving and is intended to improve driving safety and convenience.

[0036] The virtual image distance of the virtual image formed by the existing HUD system cannot be adjusted, that is, the virtual image distance of the virtual image formed by the same HUD is fixed, and the virtual image distance of the virtual image cannot be adjusted in real time according to the actual driving situation. In addition, with the diversification of user needs, according to the actual driving situation, it is required to be able to present virtual images with different virtual image distances at different times; however, the adjustment of the virtual image position may affect the clarity of the image. The traditional head-up display device cannot present clear images with different virtual image distances at different times.

[0037] To this end, an embodiment of the present application provides a head-up display device.

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

[0039] Reference Figure 1-Figure 4 The image generating unit 1 includes a projection lens 11, and the projection lens 11 includes at least one movable lens group, and the movable lens group moves along the propagation direction of the projection light;

[0040] Reference Figure 1-Figure 4 , the diffusion 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 diffusion 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 diffusion screen 2;

[0041] , the reflector assembly 3 is used to reflect the projection light from the diffusion screen 2 to the transparent medium 4 , so as to form virtual images with different virtual image distances in front of the transparent medium 4 .

[0042] Now, the main components of the head-up display device along the propagation direction of the projection light are analyzed in detail: the image generating unit 1, the diffusion screen 2, the reflector assembly 3 and the transparent medium 4.

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

[0044] Reference Figure 1-Figure 4 From the structure of the image generating unit 1 provided in the present application, the image generating unit 1 mainly includes a projection lens 11. The projection lens 11 includes at least one movable lens group, and the movable lens group is 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] That is, the projection lens 11 of the present application can adjust the focal length of the projection lens 11 by providing at least one movable lens group. This allows the HUD system to adjust the distance of the virtual screen as needed to adapt to the vision requirements and driving environment of different drivers.

[0046] The movable lens group may 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, so that the light tends to a common point (focus) after passing through the lens. Figure 2 As shown in FIG. 1 , it helps to form a clear image at a longer distance. That is, in this embodiment, the image plane position of the projection lens 11 is farther away, and the diffusion screen 2 moves to the image plane position of the image generating unit 1 accordingly.

[0048] In another example, refer to Figure 3 , the movable lens group is a negative power lens group 112. The negative power lens group 112 is opposite to the positive power lens group 111, and has the characteristic of diverging light. This lens group forms a clear image at a relatively close distance (such as Figure 3 That is, in this embodiment, the image plane position of the projection lens 11 is relatively close, and the diffusion screen 2 moves to the image plane position of the image generating unit 1 accordingly.

[0049] In another example, referring to Figure 4, the movable lens group is a positive power lens group 111 and a negative power lens group 112. When the movable lens group includes both positive power and negative power lenses (such as Figure 4 As shown in the figure, the system can adjust the focal length more flexibly to adapt to a wider range of driver vision requirements and driving environments.

[0050] The diffuser 2 is located behind the image generating unit 1, specifically at the image plane of the image generating unit 1. The diffuser 2 is used to diffuse the light generated by the image generating unit 1. The diffuser 2 is designed to be movable along the propagation direction of the projection light, and its position is located at the image plane of the image generating unit 1. This means that the diffuser 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 2, it can be ensured that it accurately receives the image generated by the image generating unit 1, thereby maintaining the clarity and integrity of the image.

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

[0052] In addition to optimizing the imaging effect, the mobility of the diffuser 2 also allows the head-up display device to adjust the distance between the diffuser 2 and the reflector assembly 3. This adjustment can change the reflection angle and path of the 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 special screen). Figure 1 The head-up display device can form virtual images with different virtual image distances and higher definition between the positions 1a and 1b at different times, wherein the image formed at the position 1a is a far virtual image distance image, and the image formed at the position 1b is a near virtual image distance image.

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

[0054] Exemplarily, the mechanical structure for realizing the movement of the diffusion screen 2 further includes a driving device (such as a motor, a stepping motor, etc.) for providing the power required for the movement.

[0055] In addition, in the embodiment of the present application, the moving distance of the diffusion screen 2 and the moving distance of the movable lens group are also limited.

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

[0057] The moving distance of the movable lens group is designed to be smaller than the moving distance of the diffuser screen 2. This means that when the focus needs to be adjusted, the movement of the lens group is more precise and delicate to ensure that the image plane of the image generating unit 1 can be accurately focused on the diffuser screen 2. By limiting the moving distance of the lens group, the system can achieve more precise focus adjustment, thereby ensuring that the generated image on the diffuser screen 2 presents the best clarity and quality.

[0058] For example, the moving distance of the movable lens group is often much smaller than the moving distance of the diffusion screen 2. Figure 1 The moving distance of the diffusion screen 2 is the distance between the position 2a and the position 2b, and the distance range is: 20mm~120mm. The moving distance range of the movable lens group is often 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 the 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, and a lens, which work together to focus the image light and project it onto a transparent medium 4 (such as a windshield). Specifically, at different times, the transparent medium 4 can display virtual images with different virtual image distances when facing away from the front of the human eye.

[0060] In the embodiment of the present application, the reflector assembly 3 may include one reflector or two reflectors. Figure 1 The reflector assembly 3 includes a reflector. The reflector is used to receive the projection light emitted by the diffusion screen 2 and reflect the projection light to the transparent medium 4, and the transparent medium 4 forms a virtual image in front of the transparent medium 4 away from the human eye, wherein the virtual image distance of the virtual image is different based on the different setting positions of the diffusion screen 2.

[0061] In the head-up display device provided in the embodiment of the present application, through the coordinated action of the movable lens group in the projection lens 11, the diffuser screen 2, the reflector assembly 3 and the transparent medium 4 optical elements, at different times, a virtual image with different virtual image distances and high definition can be formed in front of the transparent medium 4. Compared with the HUD system that presents a virtual image with a fixed virtual image distance, the embodiment of the present application can provide the driver with a clear virtual image 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 the present application, referring to Figure 2 The projection lens 11 is composed of a positive optical power lens group 111 , and the positive optical power lens group 111 serves as a movable lens group of the projection lens 11 .

[0063] In this embodiment, the projection lens 11 only includes a positive power lens group 111. When the diffusion screen 2 moves along the propagation direction of the projection light (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 virtual image is adjusted from position 1a to position 1b.

[0064] Specifically, when the diffuser 2 moves from the 2a position to the 2b position, since the position of the reflector assembly 3 is relatively fixed, when the setting position of the diffuser 2 is adjusted, the angle and transmission path of the projection light emitted by the diffuser 2 to the reflector assembly 3 will also be adjusted, so 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 (1a position) to a closer distance (1b position), that is, the adjustment from a far virtual image distance image to a near virtual image distance image is achieved.

[0065] In order to ensure the clarity of the picture quality, when the diffuser 2 moves from a position far from the reflector assembly 3 (position 2a) to a position close to the reflector assembly 3 (position 2b), the positive optical power lens group 111 can move from a position close to the display chip 10 to a position far from the display chip 10. The moving direction of the positive optical power lens group 111 is the same as that of the diffuser 2.

[0066] Specifically, the movement of the diffuser screen 2 will change the position of the virtual image, but may also cause a decrease in image quality, such as changes in brightness, contrast and clarity. The adjustment of the positive power lens group 111 is intended to compensate for these changes and ensure that the image quality remains clear when the diffuser screen 2 changes position.

[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 heavy. In order to reduce the burden of the motor providing the moving power, a focus group can be specially designed. The focus group is a negative power lens group 112, such as Figure 3 shown.

[0068] It should be noted that Figure 2 Only the moving direction of the positive power lens group 111 is shown, and the specific number of lenses and lens structure of the positive power lens group 111 are not particularly limited.

[0069] Below Figure 3 The moving scheme of the movable lens group is introduced.

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

[0071] In this embodiment, 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 negative power lens groups 112 serves as a movable lens group of the projection lens 11 .

[0072] Exemplarily, the projection lens 11 includes a negative optical power lens group 112 , and the negative optical power lens group 112 serves as a movable lens group of the projection lens 11 .

[0073] Exemplarily, the projection lens 11 includes two or more negative optical power lens groups 112 , and one or two or more negative optical power lens groups 112 of the two or more negative optical power lens groups 112 serve as movable lens groups of the projection lens 11 .

[0074] When the diffusion 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 virtual image is adjusted from position 1a to position 1b.

[0075] In order to ensure the clarity of the picture quality, when the diffuser screen 2 moves from a position far away from the reflector assembly 3 (position 2a) to a position close to the reflector assembly 3 (position 2b), a group of negative optical focal length lens groups 112 can be moved, or two or more groups of negative optical focal length lens groups 112 can be moved in coordination to make the image of the diffuser screen 2 clear.

[0076] For example, when the projection lens 11 includes a movable negative optical focal length 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 optical focal length 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 far from the reflector assembly 3 (position 2a) to a position close to the reflector assembly 3 (position 2b), the negative optical focal length lens group 112 moves from a position far from the display chip 10 to a position close to the display chip 10.

[0078] It should be noted that Figure 3 Only the positions of the positive power lens group 111 and the negative power lens group 112 and the moving direction of the negative power lens group 112 are shown, and the specific lens number and lens structure of the positive power lens group 111 and the negative power lens group 112 are not particularly limited.

[0079] In the case where the projection lens 11 includes at least one positive power lens group 111 and at least one negative power lens group 112, and one of the negative power lens groups 112 is used as a movable lens group of the projection lens 11, the setting position of the movable negative power lens group 112 is limited. The image generating unit 1 further includes a display chip 10, and the movable negative power lens group 112 is arranged closest to the display chip 10, or the movable negative power lens group 112 is arranged farthest 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 diverge the light emitted from the display chip 10, which is more direct and effective for adjusting the diffusion degree and focal length of the light. This setting is suitable for devices that require high flexibility to adjust the image size and focal length, because by moving this group of lenses, the diffusion and focusing characteristics of the light can be quickly changed.

[0081] In another example, the negative power lens group 112 is arranged at the position farthest from the display chip 10, so that it can play the final adjustment role in the light path. This helps to fine-tune the final focal length and image quality after the light passes through other lens groups. This setting may be more suitable for devices with extremely high requirements for image quality and need to accurately control light diffusion and focusing.

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

[0083] In this embodiment, by using at least two negative lens groups in combination, more precise focusing can be achieved, a larger magnification can be provided, and aberration correction can be optimized.

[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 clear focus on the projected image. Multiple movable negative power lens groups 112 can provide more precise focus adjustment, especially in applications that require rapid and continuous focus adjustment.

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

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

[0087] In the case where the projection lens 11 includes at least one positive power lens group 111 and at least two 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 arrangement position of the movable negative power lens groups 112 is limited. The two negative power lens groups 112 that move along the propagation direction of the projection light are arranged at intervals, and at least one positive power lens group 111 is arranged between the two.

[0088] In this embodiment, the two negative power lens groups 112 moving along the direction of projection light propagation are arranged at intervals, which means that there should be a certain distance between them, rather than being closely adjacent. This spacing arrangement can provide more space to adjust the position of the lens group, thereby achieving more precise control of the focal length, magnification and aberration.

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

[0090] It should be noted that according to Figure 3 In the case where only the negative power lens group 112 is used as the 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 130 mm, the focusing range is often no more than ±40 mm. In order to increase the focusing stroke length, a dual-group linkage focusing method can be used, such as Figure 4 shown.

[0091] Below Figure 4 The moving scheme of the movable lens group is introduced.

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

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

[0094] When the diffusion 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 virtual image is adjusted from position 1a to position 1b.

[0095] In order to ensure the clarity of the picture quality, when the diffuser screen 2 moves from a position far away from the reflector assembly 3 (position 2a) to a position close to the reflector assembly 3 (position 2b), the negative optical focal length lens group 112 and the positive optical focal length lens group 111 can be moved simultaneously (that is, the positive optical focal length lens group 111 and the negative optical focal length lens group 112 move together) to make the diffuser screen 2 have a clear image, or the movement of the positive optical focal length lens group 111 causes the rear focus to change, and the negative optical focal length lens group 112 is refocused to enable the diffuser screen 2 to obtain a clear image during the movement process from position 2a to position 2b.

[0096] In this example, two positive and negative lens groups are used to implement the focusing process of the projection lens 11, which can increase the focusing range. For example, based on a projection distance of 130 mm, the focusing range can reach ±60 mm.

[0097] It should be noted that Figure 4 Only the position of the positive power lens group 111 and the negative power lens group 112 and the moving directions of the positive power lens group 111 and the negative power lens group 112 are shown, and no special limitation is imposed on the specific number of lenses and lens structure of the positive power lens group 111 and the negative power lens group 112.

[0098] In this embodiment, refer to Figure 4 The projection lens 11 includes a positive power lens group 111 and a negative power lens group 112 moving along the propagation direction of the projection light. 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 the two.

[0099] In one example, the positive power lens group 111 and the negative power lens group 112 are closely arranged without any other lens groups interposed therebetween. This configuration can be used in projection lenses 11 that require a compact design, where space limitations are a key factor. Adjacent positive and negative lens groups can be moved by cooperating with each other to correct specific aberrations, such as chromatic aberration or spherical aberration.

[0100] In another example, at least one additional lens group is arranged between the positive power lens group 111 and the negative power lens group 112. The additional lens group can be of positive power, negative power or composite power, depending on the requirements of the lens design. The spacing arrangement provides more design flexibility and can be used to achieve more complex aberration correction, focal length adjustment or magnification change.

[0101] Whether arranged adjacently or spaced apart, the combination of positive power lens group 111 and negative power lens group 112 can be used to adjust the focal length and magnification. Spaced apart arrangements can provide a wider range of adjustments because the additional lens groups can 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 usually used to make the light more focused. The negative power lens group 112 has a diverging effect on light, and is usually used to adjust the degree of diffusion of light.

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

[0105] When the focal length needs to be adjusted, the positive power lens group 111 and the negative power lens group 112 will move along the propagation direction of the projection light. However, the movement directions of the two groups of lenses are opposite. If the positive power lens group 111 moves forward to increase the convergence effect, then the negative power lens group 112 will usually move backward to reduce the divergence effect, or vice versa.

[0106] This movement in opposite directions is to maintain the balance and focusing effect of the light inside the lens. By accurately adjusting the positions of the two groups of lenses, a clear projection image can be presented at the image plane position of the image generating unit 1.

[0107] The embodiment of the present application further provides a vehicle, wherein the vehicle comprises the head-up display device as described above.

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

[0109] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0110] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A head-up display device, characterized in that: Along the direction of projection light propagation, it includes: An image generating unit (1) is used to generate an image, the image generating unit (1) comprising a projection lens (11), the projection lens (11) comprising at least one movable lens group, the movable lens group being movable along a propagation direction of a projection light; A diffusion screen (2), the diffusion screen (2) being configured to move along the propagation direction of the projection light to an image plane located at the image generating unit (1) so as to receive the image generated by the image generating unit (1); the moving distance of the diffusion screen (2) is smaller than the depth of field of the projection lens (11), and the moving distance of the movable lens group is smaller than the moving distance of the diffusion screen (2); A reflector assembly (3) and a transparent medium (4), wherein the reflector assembly (3) is used to reflect the projection light from the diffusion screen (2) to the transparent medium (4), so as to form a virtual picture with different virtual image distances 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 power lens group (111), and the positive power lens group (111) 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) comprises at least one group of positive power lens groups (111) and at least one group of negative power lens groups (112); the positive power lens groups (111) are fixedly arranged, and at least one group of negative power lens groups (112) is configured to be movable along the propagation direction of the projection light.

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

5. The head-up display device according to claim 3, characterized in that: The projection lens (11) comprises at least two groups of negative optical power lens groups (112), and at least two of the negative optical power lens groups (112) are configured to be movable along the propagation direction of the projection light.

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

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

8. The head-up display device according to claim 7, characterized in that: The projection lens (11) comprises a group of positive power lens groups (111) and a group of negative power lens groups (112) moving along the propagation direction of the projection light, wherein 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 the two.

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

10. A vehicle, characterized in that: The vehicle comprises the head-up display device according to any one of claims 1 to 9.

Images