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, which comprises an image generation part and a Fresnel lens group along a projection light propagation direction; the image generation component is used for generating an image, the Fresnel lens group is located on the light emitting side of the image generation component, and the Fresnel lens group is used for adjusting the focal length of the image generated by the image generation component; the diffusion screen is configured to move along the propagation direction of the projection light and is used for receiving the image generated by the image generation unit; 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, comprising an image generating component and a Fresnel lens group;

[0008] The image generating component is used to generate an image, the Fresnel lens group is located at the light exiting side of the image generating component, and the Fresnel lens group is used to adjust the focal length of the image generated by the image generating component;

[0009] a diffusion screen, the diffusion screen being configured to move along a propagation direction of the projection light and used for receiving the image generated by the image generating component;

[0010] 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.

[0011] Optionally, the image generating component comprises a projection lens, the Fresnel lens group is located at a light exiting side of the projection lens, and the Fresnel lens group is used to adjust the focal length of the image generated by the projection lens.

[0012] Optionally, the image generating unit includes a projection lens, the Fresnel lens group serves as a lens group in the projection lens, and the Fresnel lens group is used to adjust the focal length of the projection lens.

[0013] Optionally, the image generating component includes a display chip, and the Fresnel lens group in the projection lens is closest to the display chip; or the Fresnel lens group in the projection lens is farthest from the display chip.

[0014] Optionally, the Fresnel lens group is a negative lens group, and the moving direction of the Fresnel lens group along the propagation direction of the projection light is opposite to the moving direction of the diffusion screen.

[0015] Optionally, when the diffuser screen moves from a position away from the reflector assembly to a position close to the reflector assembly, the Fresnel lens group moves from a position away from the image generating component to a position close to the image generating component, and the picture formed by the transparent medium is adjusted from a picture with a long virtual image distance to a picture with a near virtual image distance.

[0016] Optionally, when the diffuser screen moves from a position close to the reflector assembly to a position away from the reflector assembly, the Fresnel lens group moves from a position close to the image generating component to a position away from the image generating component, and the picture formed by the transparent medium is adjusted from a picture with a near virtual image distance to a picture with a far virtual image distance.

[0017] Optionally, there is a linear relationship between the moving distance of the Fresnel lens group and the moving distance of the diffusion screen.

[0018] Optionally, the moving distance range of the diffusion screen is: 20mm-60mm.

[0019] Optionally, the transmittance of the diffusion screen is greater than 80%.

[0020] Optionally, the diffusion screen has the function of diffusing and angularly deflecting visible light with a wavelength of 400nm-700nm.

[0021] Optionally, the diffusion angle of the diffusion screen is in the range of 10° to 60°, and the deflection angle of the diffusion screen to light is in the range of 0°≤deflection angle≤25°.

[0022] 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.

[0023] According to the embodiment of the present application, through the coordinated action of the image generating component, the Fresnel lens group, the diffusion screen, the reflector assembly and the transparent medium optical element, a virtual image with different virtual image distances and high definition 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.

[0024] 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

[0025] 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.

[0026] Figure 1 The structure of the head-up display device provided in the embodiment of the present application is shown as follows Figure 1 .

[0027] Figure 2 The structure of the head-up display device provided in the embodiment of the present application is shown as follows Figure 2 .

[0028] Figure 3 The structure of the head-up display device provided in the embodiment of the present application is shown as follows Figure 3 .

[0029] Description of reference numerals:

[0030] 1. Image generating unit; 10. Image generating component; 11. Fresnel lens group; 12. Projection lens; 13. Display chip; 121. Fixed lens group;

[0031] 2. Diffusion screen;

[0032] 3. Reflector assembly; 31. First reflector; 32. Second reflector;

[0033] 4. Transparent medium. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] To this end, an embodiment of the present application provides a head-up display device.

[0042] In the embodiments of this application, refer to Figure 1-Figure 3 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.

[0043] The image generating unit 1 comprises an image generating component 10 and a Fresnel lens group 11. The image generating component 10 is used to generate an image, the Fresnel lens group 11 is located at the light exiting side of the image generating component 10, and the Fresnel lens group 11 is used to adjust the focal length of the image generated by the image generating component 10.

[0044] The diffusion screen 2 is configured to move along the propagation direction of the projection light, and is used to receive the image generated by the image generating unit 1 .

[0045] The reflector assembly 3 is used to reflect the projection light from the diffusion screen 2 to the transparent medium 4 to form virtual images with different virtual image distances in front of the transparent medium 4 .

[0046] 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.

[0047] The image generating unit 1 is responsible for generating information or images to be displayed. The image generating unit 1 can display different 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 images generated by the image generating unit 1 usually contain key driving information such as vehicle speed, navigation instructions, safety warnings, etc.

[0048] Reference Figure 1-Figure 3 From the structure of the image generating unit 1 provided in the present application, the image generating unit 1 includes an image generating component 10 and a Fresnel lens group 11. The image generating component 10 may mainly include a display chip 13 for displaying information or images, that is, the image generating component 10 is responsible for generating images, and the Fresnel lens group 11 is located on the light-emitting side of the image generating component 10, and is used to adjust the focal length of the image so that the image plane position of the image generating unit 1 presents a clear image.

[0049] That is to say, the Fresnel lens group 11 of the present application can adjust the focal length of the image generated by the image generating component 10 through its special lens structure. This allows the HUD system to adjust the distance of the virtual picture as needed to adapt to the vision requirements and driving environment of different drivers.

[0050] The Fresnel lens group 11 includes at least one Fresnel lens, and the focus ring is an important component of the Fresnel lens group 11, which allows the user to adjust the position of the lens group or the relative distance between the internal lenses by rotating. This adjustment can change the refraction path and focusing position of the lens group for light, thereby adjusting the size and clarity of the image. For example, when a clearer image is required, the position of the Fresnel lens group 11 or the position of the internal lens in the Fresnel lens group 11 can be adjusted by rotating the focus ring so that the light can be more accurately focused on the image plane position of the image generating unit 1.

[0051] The diffusion screen 2 is located behind the image generating unit 1, specifically at the image plane of the image generating unit 1. The diffusion screen 2 is used to diffuse the light generated by the image generating unit 1. Its main function is to make the light more uniform and ensure that the image can be clearly seen in the entire display area. Through the processing of the diffusion screen 2, the light of the image becomes softer, the glare is reduced, and the visibility and readability of the image are improved.

[0052] In addition, in the embodiment of the present application, the diffuser screen 2 is designed to be movable along the direction of the projection light. By moving the diffuser screen 2, the head-up display device can adjust the distance between the diffuser screen 2 and the image generating component 10. This adjustment can change the incident angle and diffusion range of the light on the diffuser screen 2, thereby affecting the clarity of the image.

[0053] 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-Figure 3 The head-up display device can form virtual images with different virtual image distances and higher definition between the 3a position and the 3b position at different times, wherein the image formed at the 3a position is a far virtual image distance image, and the image formed at the 3b position is a near virtual image distance image.

[0054] The virtual image distance refers to the distance between the driver's eyes and the virtual image. In the head-up display device, the suitability of the virtual image distance directly affects the user's viewing experience. By adjusting the distance between the diffuser 2 and the reflector, it can be ensured that the virtual image is always within the user's field of vision, improving viewing comfort and safety.

[0055] 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.

[0056] 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.

[0057] By adjusting the position of the diffusion screen 2 and focusing the Fresnel lens group 11, the incident angle and diffusion range of the light on the diffusion screen 2 can be changed, thereby adjusting the imaging effect. For example, moving the diffusion screen 2 can increase or decrease the size of the image, change the brightness or contrast of the image, etc. In addition, by moving the diffusion screen 2, the reflection angle and path of the light on the reflector can be changed, thereby affecting the virtual image distance of the virtual image formed on the transparent medium 4 (such as a windshield or a special screen).

[0058] 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.

[0059] In the embodiment of the present application, the reflector assembly 3 may include one reflector or two reflectors. Figure 2The reflector assembly 3 includes two reflectors, including a first reflector 31 and a second reflector 32. The first reflector 31 is used to receive the projection light emitted by the diffusion screen 2 and reflect the projection light to the second reflector 32. The second reflector 32 is used to reflect the received 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.

[0060] For example, the first reflector 31 and the second reflector 32 may be free-form reflectors. The reflectivity of each reflector is greater than 80%. The VID, FOV and other parameters of the head-up display device are determined by designing the spacing, angle and surface shape of the curved mirrors. For example, the range of the VID is 2 meters to 15 meters.

[0061] In the head-up display device provided in the embodiment of the present application, through the coordinated action of the image generation component 10, the Fresnel lens group 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 11 and the setting position of the diffuser screen 2.

[0062] In a specific embodiment, referring to Figure 1 The image generating component 10 includes a projection lens 12 , and the Fresnel lens group 11 is located at the light exiting side of the projection lens 12 . The Fresnel lens group 11 is used to adjust the focal length of the image generated by the projection lens 12 .

[0063] In this embodiment, the image generating component 10 includes a display chip 13 and a projection lens 12. The Fresnel lens group 11 is a lens group of the projection lens 12 independent of the image generating component 10. That is, the Fresnel lens group 11 is located between the projection lens 12 and the diffusion screen 2, and the Fresnel lens group 11 is used to adjust the focal length of the image generated by the projection lens 12. That is to say, in this embodiment, without making any changes to the structure of the projection lens 12 of the image generating component 10 of the head-up display device, a group of Fresnel lens groups 11 is arranged on the light exit side of the projection lens 12 to achieve the focal length adjustment of the image generated by the image generating component 10.

[0064] Specifically, the Fresnel lens group 11 is located between the projection lens 12 and the diffuser screen 2, and this position enables it to further focus and adjust the light generated by the projection lens 12. The main function of the Fresnel lens group 11 is to adjust the focal length of the image generated by the projection lens 12. For example, by rotating the focus ring of the Fresnel lens group 11, precise control of the light can be achieved, thereby optimizing the clarity and detail performance of the image displayed by the diffuser screen 2.

[0065] In another specific embodiment, referring to Figure 2 and Figure 3 The image generating unit 1 includes a projection lens 12 , and the Fresnel lens group 11 serves as a lens group in the projection lens 12 . The Fresnel lens group 11 is used to adjust the focal length of the projection lens 12 .

[0066] In this embodiment, the Fresnel lens group 11 serves as a part of the lens group in the projection lens 12 of the image generating unit 1. That is, in this embodiment, the Fresnel lens group 11 is no longer a lens group independent of the projection lens 12, but serves as a part of the projection lens 12, and together with other fixed lens groups 121 in the projection lens 12, forms a complete projection lens 12. It can also be understood that the internal structure of the projection lens 12 of the image generating unit 1 in the head-up display device is adjusted so that the projection lens 12 has a focusing function.

[0067] It should be noted that the present embodiment does not specifically limit the structure of the fixed lens group 121 in the projection lens 12, as long as it can achieve light transmission. Those skilled in the art can design fixed lens groups 121 with different optical structures according to actual needs.

[0068] Specifically, refer to Figure 3 , a Fresnel lens group 11 is arranged in the optical structure of the projection lens 12, and the Fresnel lens group 11 can perform preliminary optimization on the light, or refer to Figure 2 The Fresnel lens group 11 further optimizes the light it receives. The main function of the Fresnel lens group 11 in the projection lens 12 is to adjust the focal length. By rotating the focus ring to adjust the setting position of the Fresnel lens group 11, the overall focal length of the projection lens 12 can be accurately adjusted, thereby optimizing the clarity and detail performance of the imaging picture.

[0069] The Fresnel lens group 11 works together with other fixed lens groups 121 to refract and focus the light. By adjusting the focal length setting of the Fresnel lens group 11, the propagation path and focus position of the light in the projection lens 12 can be changed, thereby achieving precise adjustment of the imaging picture.

[0070] The Fresnel lens group 11 serves as a lens group in the projection lens 12 of the image generating unit 1. For example, when the optical structure of the projection lens 12 includes an aperture, the Fresnel lens group 11 can be disposed before the aperture or after the aperture.

[0071] In one example, referring to Figure 3 The image generating component 10 includes a display chip 13. When the Fresnel lens group 11 serves as a part of the lens group in the projection lens 12 of the image generating unit 1, the Fresnel lens group 11 in the projection lens 12 can be arranged closest to the display chip 13, that is, the Fresnel lens group 11 first receives the projection light emitted by the display chip 13, performs preliminary optimization on the projection light, and then transmits it to other lens groups in the projection lens 12.

[0072] Specifically, the Fresnel lens group 11 is integrated as a part of the projection lens 12 of the image generating unit 1, and is the lens group closest to the display chip 13. This design enables the Fresnel lens group 11 to first receive the projection light emitted by the display chip 13, perform preliminary optimization processing on the light, and then transmit the light to other lens groups in the projection lens 12 for further focusing and adjustment.

[0073] When the light emitted by the display chip 13 passes through the Fresnel lens group 11, the lens group will preliminarily refract and focus the light, so that the light is transmitted to the other fixed lens group 121 in the projection lens 12 in a more uniform and concentrated manner. The other fixed lens group 121 may include different types of lenses such as convex lenses and concave lenses, which work together to achieve the best optical performance.

[0074] In another example, refer to Figure 2 The image generating component 10 includes a display chip 13. When the Fresnel lens group 11 serves as a part of the lens group in the projection lens 12 of the image generating unit 1, the Fresnel lens group 11 in the projection lens 12 is arranged farthest from the display chip 13, that is, the Fresnel lens group 11 receives the projection light emitted by other fixed lens groups 121 of the projection lens 12, and further optimizes the projection light, thereby optimizing the clarity and detail performance of the imaging picture displayed by the diffusion screen 2.

[0075] Specifically, in this example, the Fresnel lens group 11 is located at the end of the projection lens 12, that is, the position farthest from the display chip 13. This means that after the projection light passes through other lens groups in the projection lens 12, it will pass through the Fresnel lens group 11 for final optimization processing.

[0076] The main function of the Fresnel lens group 11 is to further optimize the projection light to improve the clarity and detail of the imaging picture. For example, by rotating the focus ring and adjusting the setting position of the Fresnel lens group 11, the light can be accurately focused, thereby optimizing the imaging effect.

[0077] In a specific embodiment, referring to Figure 1-Figure 3 The Fresnel lens group 11 is a negative lens group, and the moving direction of the Fresnel lens group 11 along the propagation direction of the projection light is opposite to the moving direction of the diffusion screen 2 .

[0078] In this embodiment, the Fresnel lens group 11 is a negative lens group, that is, the overall optical power of the Fresnel lens group 11 is negative. Negative lens groups are generally used to adjust focal length, correct aberrations, or achieve specific imaging effects. By designing the Fresnel lens group 11 as a negative lens group, the propagation path and imaging characteristics of the projection light can be flexibly controlled.

[0079] When the Fresnel lens group 11 moves along the direction of projection light propagation, its moving direction is opposite to the moving direction of the diffusion screen 2. This means that if the Fresnel lens group 11 moves in the direction of projection light propagation (for example, close to the display chip 13), the diffusion screen 2 will move in the opposite direction (for example, away from the display chip 13).

[0080] This design allows the focal length of the projection system to be adjusted by moving the Fresnel lens group 11. When the Fresnel lens group 11 moves, it changes the focus position of the projection light in the projection lens 12, thereby affecting the size and clarity of the image plane position of the image generating unit 1.

[0081] By adjusting the Fresnel lens group 11 in the opposite direction to the moving direction of the diffusion screen 2, the clarity of the imaging picture can be maintained, and the size of the picture can be adjusted to meet different picture quality requirements.

[0082] In one example, referring to Figure 1-Figure 3 When the diffuser 2 moves from a position away from the reflector assembly 3 to a position close to the reflector assembly 3, the Fresnel lens group 11 moves from a position away from the image generating component 10 to a position close to the image generating component 10, and the picture formed by the transparent medium 4 is adjusted from a picture with a far virtual image distance to a picture with a near virtual image distance.

[0083] In this embodiment, 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), 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 3a to position 3b.

[0084] 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 (3a position) to a closer distance (3b position), that is, the adjustment from a far virtual image distance image to a near virtual image distance image is achieved.

[0085] In order to ensure the clarity of picture quality, 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 Fresnel lens group 11 moves from a position away from the image generating component 10 (position 1a) to a position close to the image generating component 10 (position 1b).

[0086] Specifically, the movement of the diffusion 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.

[0087] The adjustment of the position of the Fresnel lens group 11 is intended to compensate for these changes and ensure that the picture quality remains clear when the position of the diffusion screen 2 changes.

[0088] By adjusting the position of the Fresnel lens group 11, the focusing and diffusion effects of light can be optimized, so that the image light forms a clearer and more uniform virtual image on the diffusion screen 2. This helps to reduce aberrations, distortions, and uneven brightness, and improve the overall quality of the image.

[0089] On the contrary, refer to Figure 1-Figure 3 When the diffuser 2 moves from a position close to the reflector assembly 3 (position 2b) to a position far from the reflector assembly 3 (position 2a), the Fresnel lens group 11 needs to move from a position close to the image generating component 10 (position 1b) to a position far from the image generating component 10 (position 1a). At this time, the picture formed by the transparent medium 4 is adjusted from a picture with a near virtual image distance to a picture with a far virtual image distance, that is, the position of the virtual picture is adjusted from position 3b to position 3a.

[0090] In one embodiment, there is a linear relationship between the moving distance of the Fresnel lens group 11 and the moving distance of the diffusion screen 2 .

[0091] In this embodiment, if there is a linear relationship between the moving distance of the Fresnel lens group 11 and the moving distance of the diffusion screen 2, it means that the movement between the two is coordinated and proportional. This design is usually to maintain the stability and performance of the optical system, especially in the occasions where the image position or focal length needs to be dynamically adjusted.

[0092] A linear relationship refers to a proportional or inversely proportional relationship between two variables, that is, when one variable changes, the other variable changes accordingly at a fixed ratio or slope. In this embodiment, there is such a linear relationship between the moving distances of the Fresnel lens group 11 and the diffusion screen 2. When the diffusion screen 2 moves, it changes the position of the virtual image. In order to maintain the clarity of the image, the position of the Fresnel lens group 11 needs to be adjusted accordingly to compensate for the optical changes caused by the movement of the diffusion screen 2. By establishing a linear relationship, it can be ensured that the movement of the Fresnel lens group 11 is coordinated with the movement of the diffusion screen 2, thereby maintaining the clarity and quality of the image.

[0093] For example, the Fresnel lens group 11 and the diffusion screen 2 may be connected via a mechanical linkage device so that they can move synchronously according to a predetermined linear relationship.

[0094] For example, an electronic control system can be used to monitor and control the movement of the Fresnel lens group 11 and the diffusion screen 2. The positions of the two components are detected in real time by sensors, and their movement speed and distance are adjusted according to a preset linear relationship using a microprocessor or controller.

[0095] In a specific embodiment, the moving distance of the diffusion screen 2 ranges from 20 mm to 60 mm.

[0096] In this embodiment, the moving distance range of the diffusion screen 2 refers to the maximum and minimum distances that the diffusion screen 2 can move relative to its initial position or a reference position. In this embodiment, this range is 20 mm to 60 mm. Figure 1-Figure 3 , the distance between position 2a and position 2b ranges from 20mm to 60mm.

[0097] The movement of the diffuser 2 can change the position of the virtual image relative to the driver. By adjusting the position of the diffuser 2 within this range, the virtual image can be placed in a more suitable visual position to improve the comfort and safety of the driver. For example, when the diffuser 2 moves between position 2a and position 2b, the virtual image can move between 2 meters and 15 meters, that is, the virtual image distance range of the virtual image is: 2 meters to 15 meters.

[0098] There is a linear relationship between the moving distance range of the Fresnel lens group 11 and the moving distance range of the diffusion screen 2. The moving distance range of the Fresnel lens group 11 may be in the range of 0.2 mm to 0.6 mm.

[0099] It should be noted that the moving distance of the diffusion screen 2 is related to other parameters such as the parameters of the projection lens 12 and the parameters of the Fresnel lens group 11 , and the movable distance range may be different under different design parameters.

[0100] In one embodiment, the transmittance of the diffusion screen 2 is greater than 80%.

[0101] In this embodiment, the diffusion screen 2 is located at the image plane position of the image generating unit 1, that is, the diffusion screen 2 serves as the image plane, and its transmittance is greater than 80%.

[0102] In an optical system, the image plane refers to the plane where a clear image is formed after light is focused by a lens group. In this embodiment, the diffuser 2 is placed at the image plane position of the image generating unit 1, that is, the image light forms a clear virtual image on the diffuser 2.

[0103] The main function of the diffuser 2 is to diffuse the focused image light to form a larger virtual image so that the observer can see the entire image more easily. The diffuser 2 also plays a certain role in light uniformity, which helps to reduce the problems of uneven brightness and contrast in the image.

[0104] In addition, transmittance refers to the ratio of transmitted light to incident light when light passes through an optical element (such as the diffuser 2 ).

[0105] In this embodiment, the transmittance of the diffuser 2 is greater than 80%, which means that most of the incident light can pass through the diffuser 2, and only a small part is absorbed or reflected. The high transmittance helps to maintain high brightness and contrast of the image, because more light can reach the observer's eyes, improving the clarity of the image viewed by the driver.

[0106] In one embodiment, the diffusion screen 2 has the functions of diffusing and angularly deflecting visible light with a wavelength of 400nm-700nm.

[0107] In this embodiment, the diffusion function means that the diffusion screen 2 can scatter the incident light on its surface so that the light is distributed at a wider angle.

[0108] In a head-up display (HUD), the diffusion function of the diffuser 2 helps to diffuse the image light to form a larger virtual image so that the observer can see the entire image more easily. This is crucial to improving the visibility and readability of the image, especially in situations that require high concentration, such as driving.

[0109] For example, the diffusion function of the diffusion screen 2 is usually achieved through microstructures or textures on its surface. These microstructures or textures can change the propagation direction of light and scatter it at different angles.

[0110] In addition, the angle deflection function means that the diffusion screen 2 can deflect the incident light on its surface to a certain extent, thereby changing the propagation direction of the light.

[0111] In HUD, the angle deflection function helps adjust the exit angle of the image light so that the virtual image is positioned at the driver's desired visual position. This is very important to meet the eye heights and preferences of different drivers and optimize the visibility of the image.

[0112] In a specific embodiment, the diffusion angle of the diffusion screen 2 is in the range of 10° to 60°, and the deflection angle of the light by the diffusion screen 2 is in the range of 0°≤deflection angle≤25°.

[0113] The diffusion angle refers to the distribution range of the scattering angle of the light after passing through the diffusion screen 2. In this embodiment, the diffusion angle of the diffusion screen 2 ranges from 10° to 60°. The size of the diffusion angle directly affects the size and brightness distribution of the virtual image. A smaller diffusion angle can form a more compact virtual image, while a larger diffusion angle helps to expand the coverage of the virtual image. By adjusting the diffusion angle, the visibility and readability of the HUD system under different light conditions can be optimized.

[0114] The light deflection angle refers to the angle between the propagation direction of the light and the original incident direction after the light passes through the diffusion screen 2. In this embodiment, the light deflection angle of the diffusion screen 2 ranges from 0° to 25°.

[0115] The control of the light deflection angle is crucial to positioning the virtual image at the desired visual position of the driver. By precisely controlling the deflection angle, it is possible to ensure that the image provided by the HUD system matches the driver's line of sight and preference, thereby improving driving safety and comfort. In addition, the adjustment of the light deflection angle also helps to optimize the image quality and contrast of the HUD system under different lighting conditions.

[0116] Therefore, in this embodiment, the diffusion angle and the deflection angle of the diffusion screen 2 are limited, so as to ensure the image quality of the image presented by the HUD system.

[0117] The embodiment of the present application further provides a vehicle, wherein the vehicle comprises the head-up display device as described above.

[0118] 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.

[0119] 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.

[0120] 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) comprises an image generating component (10) and a Fresnel lens group (11); The image generating component (10) is used to generate an image, the Fresnel lens group (11) is located on the light exiting side of the image generating component (10), and the Fresnel lens group (11) is used to adjust the focal length of the image generated by the image generating component (10); a diffusion screen (2), the diffusion screen (2) being configured to move along the propagation direction of the projection light and used for receiving the image generated by the image generating unit (1); 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 image generating component (10) comprises a projection lens (12), the Fresnel lens group (11) is located on the light exit side of the projection lens (12), and the Fresnel lens group (11) is used to adjust the focal length of the image generated by the projection lens (12).

3. The head-up display device according to claim 1, characterized in that: The image generating unit (1) comprises a projection lens (12), the Fresnel lens group (11) serves as a lens group in the projection lens (12), and the Fresnel lens group (11) is used to adjust the focal length of the projection lens (12).

4. The head-up display device according to claim 3, characterized in that: The image generating component (10) comprises a display chip (13), and the Fresnel lens group (11) in the projection lens (12) is closest to the display chip (13); or the Fresnel lens group (11) in the projection lens (12) is farthest from the display chip (13).

5. The head-up display device according to any one of claims 1 to 4, characterized in that: The Fresnel lens group (11) is a negative lens group, and the moving direction of the Fresnel lens group (11) along the propagation direction of the projection light is opposite to the moving direction of the diffusion screen (2).

6. The head-up display device according to claim 5, characterized in that: When the diffusion screen (2) moves from a position away from the reflector assembly (3) to a position close to the reflector assembly (3), the Fresnel lens group (11) moves from a position away from the image generating component (10) to a position close to the image generating component (10), and the image formed by the transparent medium (4) is adjusted from a far virtual image distance image to a near virtual image distance image.

7. The head-up display device according to claim 5, characterized in that: When the diffusion screen (2) moves from a position close to the reflector assembly (3) to a position far from the reflector assembly (3), the Fresnel lens group (11) moves from a position close to the image generating component (10) to a position far from the image generating component (10), and the image formed by the transparent medium (4) is adjusted from an image with a near virtual image distance to an image with a far virtual image distance.

8. The head-up display device according to claim 5, characterized in that: There is a linear relationship between the moving distance of the Fresnel lens group (11) and the moving distance of the diffusion screen (2).

9. The head-up display device according to claim 8, characterized in that: The moving distance range of the diffusion screen (2) is 20 mm to 60 mm.

10. The head-up display device according to claim 1, characterized in that: The transmittance of the diffusion screen (2) is greater than 80%.

11. The head-up display device according to claim 1 or 10, characterized in that: The diffusion screen (2) has the functions of diffusion and angle deflection for visible light with a wavelength of 400nm-700nm.

12. The head-up display device according to claim 11, characterized in that: The diffusion angle of the diffusion screen (2) is in the range of 10° to 60°, and the deflection angle of the diffusion screen (2) to light is in the range of 0°≤deflection angle≤25°.

13. A vehicle, characterized in that: The vehicle comprises the head-up display device according to any one of claims 1-12.

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