Vehicle HUD system and vehicle

Abstract

An embodiment of the present application provides a vehicle-mounted HUD system and a vehicle; wherein the vehicle-mounted HUD system includes a PGU system, a diffusion film and a reflection system arranged in sequence; the diffusion film includes a first area and a second area; the reflection system includes a spectrometer module and a secondary optical module, and the spectrometer module is located between the diffusion film and the secondary optical module; light emitted from different areas of the PGU system passes through the first area and the second area respectively and is reflected by the reflection system to the windshield of the vehicle, and the windshield can reflect the light to the human eye, and at the same time, the reverse extension line of the light forms a virtual image at different depths of field in front of the windshield.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of vehicle-mounted display technology, and more specifically, to a vehicle-mounted HUD system and a vehicle. Background Art

[0002] With the rapid development of automobile technology, the Head Up Display (HUD), as an important component of the Advanced Driver Assistance Systems (ADAS), plays an important role in improving driving safety and convenience. In order to further improve the richness of information presentation and the realism of visual experience, the dual virtual image vehicle HUD system came into being. It innovatively adopts a dual virtual image design of one near and one far, aiming to display different types of driving information in different areas. Figure 1 A dual virtual image vehicle-mounted HUD system is shown, which, through an optical layout, allows the projection light to be amplified by the secondary optical module 400 and then reflected by the windshield 500, and finally forms a clear virtual image in front of the human eye 600: the distant virtual image 701 is set at a distance of, for example, 7.5 m, while the near virtual image 702 is close to a distance of, for example, about 3 m, thereby achieving a dual display of a road condition overview and instrument details.

[0003] The dual virtual image vehicle HUD system currently on the market generally adopts the above-mentioned up-down dislocation display mode. Although it realizes the layered display of information, it also creates an inevitable sense of fragmentation visually. This non-uniform display mode not only affects the driver's rapid capture and understanding of information, but may also weaken the smooth visual experience of driving to a certain extent. Summary of the invention

[0004] The purpose of this application is to provide a new technical solution for an in-vehicle HUD system and a vehicle.

[0005] In a first aspect, an embodiment of the present application provides a vehicle-mounted HUD system. The vehicle-mounted HUD system includes a PGU system, a diffusion film, and a reflection system arranged in sequence;

[0006] The diffusion film includes a first region and a second region;

[0007] The reflection system includes a beam splitter module and a secondary optical module, wherein the beam splitter module is located between the diffusion film and the secondary optical module;

[0008] The light emitted from different areas of the PGU system passes through the first area and the second area respectively and is reflected by the reflection system to the windshield of the vehicle. The windshield can reflect the light to the human eye. At the same time, the reverse extension line of the light forms a virtual image at different depths of field in front of the windshield.

[0009] Optionally, the beam splitter module includes a beam splitter and a reflector;

[0010] The first light emitted by the PGU system passes through the first area and is reflected by the reflector to the beam splitter, and is projected to the windshield after being partially reflected by the beam splitter. The windshield reflects the first light to the human eye, and the reverse extension line of the first light forms a distant virtual image in front of the windshield;

[0011] The second light emitted by the PGU system passes through the second area and partially passes through the beam splitter, and then is projected onto the windshield. The windshield reflects the second light to the human eye, and at the same time, the reverse extension line of the second light forms a near-field virtual image in front of the windshield.

[0012] Optionally, the centers of the virtual images formed at different depths of field in front of the windshield are all located on the visual axis of the human eye.

[0013] Optionally, the secondary optical module is located on the optical path of the light propagated by the beam splitter, and the secondary optical module can reflect the light emitted by the beam splitter to the windshield.

[0014] Optionally, the secondary optical module is a single free-form surface mirror, a free-form surface mirror group, or a free-form surface mirror and a plane reflecting mirror group.

[0015] Optionally, the first area and the second area are located on the same plane, and a shielding area is provided between the first area and the second area.

[0016] Optionally, the first region has a first microstructure, the second region has a second microstructure, and the first microstructure is different from the second microstructure;

[0017] The first microstructure can cause the first projected light to propagate toward the reflector after being angle-modulated, and the second microstructure can cause the second projected light to propagate toward the beam splitter after being angle-modulated.

[0018] Optionally, the reflector and the beam splitter are tilted, and the beam splitter is located on a reflection path of the reflector, so that the light projected onto the beam splitter can be incident on the secondary optical module.

[0019] Optionally, the beam splitter includes a semi-reflective and semi-transmissive beam splitter, a polarizing beam splitter or a band filter.

[0020] Optionally, the PGU system is any one of a TFT system, a DLP system and a LCOS system.

[0021] Optionally, the PGU system is configured as a single unit, and the PGU system includes a PGU module;

[0022] The PGU module is configured to be divided into at least a first light-emitting area and a second light-emitting area according to different positions, the first light-emitting area is used to emit the first light, and the second light-emitting area is used to emit the second light.

[0023] In a second aspect, an embodiment of the present application provides a vehicle, the vehicle comprising:

[0024] the body of the vehicle, including the windscreen; and

[0025] As described in the first aspect, the vehicle-mounted HUD system is arranged on the vehicle body.

[0026] The beneficial effects of this application are:

[0027] The embodiment of the present application provides a vehicle-mounted HUD system, which realizes the same visual axis or highly fused display of near and far virtual images through a unique optical architecture design. Compared with the traditional up and down staggered display method, the image is more visually unified, avoiding the sense of image fragmentation, and significantly improving the driver's visual experience; the spatial overlap of near and far virtual images makes the image display more coherent. For example, the driver can obtain a road condition overview and instrument detail information at the same time within the same field of view without frequently switching lines of sight, thereby improving the efficiency and safety of information acquisition.

[0028] 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

[0029] 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.

[0030] Figure 1 This is a schematic diagram of the structure of a traditional vehicle-mounted HUD system;

[0031] Figure 2 A schematic diagram of the structure of a vehicle-mounted HUD system provided in an embodiment of the present application.

[0032] Description of reference numerals:

[0033] 100, PGU system; 101, PGU module; 102, first light; 103, second light; 200, diffusion film; 201, first area; 202, second area; 203, shielding area; 300, spectrometer module; 301, spectrometer; 302, reflector; 400, secondary optical module; 500, windshield; 600, human eye; 701, distant virtual image; 702, near virtual image. 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] The following is a detailed description of the vehicle-mounted HUD system and vehicle provided in the embodiments of the present application in conjunction with the accompanying drawings.

[0040] According to one embodiment of the present application, a vehicle-mounted HUD system is provided. Figure 2 The vehicle-mounted HUD system includes a PGU system 100, a diffusion film 200 and a reflection system which are arranged in sequence; the diffusion film 200 includes a first area 201 and a second area 202; the reflection system includes a spectroscope module 300 and a secondary optical module 400, and the spectroscope module 300 is located between the diffusion film 200 and the secondary optical module 400; the light emitted from different areas of the PGU system 100 passes through the first area 201 and the second area 202 respectively and is reflected by the reflection system to the windshield 500 of the vehicle, and the windshield 500 can reflect the light to the human eye 600, and at the same time, the reverse extension line of the light forms a virtual image at different depths of field in front of the windshield 500.

[0041] The vehicle-mounted HUD system provided in the embodiment of the present application exhibits an ingenious optical structure design, especially the introduction of the reflection system after the diffusion film 200, and the reflection system includes a specially designed spectrometer module 300 and a secondary optical module 400, which ultimately realizes the spatial overlapping display of the distant virtual image 701 and the near virtual image 702 (that is, realizing the same visual axis display of the distant and near virtual images), thereby improving the information display effect and visual experience during driving.

[0042] It should be noted that the same diffusion film 200 is divided into at least two regions: a first region 201 and a second region 202, and each region processes the projected light differently to achieve separation and generation of a distant virtual image 701 and a near virtual image 702. This design simplifies the light propagation path, and allows different light rays to propagate in two different directions after being deflected and diffused at different angles, and ultimately forms virtual images with different depths of field.

[0043] The vehicle-mounted HUD system provided in the embodiment of the present application includes a PGU system 100. The PGU system 100 is the source of image generation (also called an image generator), which is responsible for generating image light containing road condition overview and instrument detail information, etc. These image lights are carefully regulated and finally output in a form suitable for subsequent optical processing to form virtual images with different depths of field.

[0044] When the traditional vehicle HUD system has the function of presenting near and far virtual images, the near and far virtual images are dislocated vertically in space. Figure 1 The vehicle-mounted HUD system provided in the embodiment of the present application realizes the same visual axis display effect of the near and far virtual images. This design eliminates the sense of fragmentation caused by image misalignment in the traditional vehicle-mounted HUD system, making the near and far image information more visually coherent and unified, and improving the driver's visual experience.

[0045] The vehicle-mounted HUD system provided in the embodiment of the present application also involves the participation of a windshield 500. The windshield 500 is, for example, the front windshield of the vehicle. As the final optical reflection surface, the windshield 500 not only protects the passengers in the vehicle, but also undertakes the task of reflecting the projection light to the human eye 600. Through its high light transmittance and good reflection performance, the windshield 500 ensures the clarity and visibility of the virtual images of the near and far scenes.

[0046] about Figure 2 The human eye 600 shown in the figure is the driver's eye. The human eye 600 receives and observes the information of the distant virtual image 701 and the near virtual image 702 reflected by the windshield 500, so that the driver can instantly perceive key information such as the road condition overview and instrument details.

[0047] The vehicle-mounted HUD system provided in the embodiment of the present application is shown in FIG. Figure 2 , with the same visual axis display function of near and far virtual images, which not only improves the visual continuity of the driver, but also enhances the real perception effect of depth information through virtual images at different distances. The driver can understand the hierarchical relationship between information more intuitively, improving the readability and understanding speed of information.

[0048] In addition, by adjusting the parameters of the PGU system 100, the diffusion film 200 and the reflection system, the vehicle-mounted HUD system can flexibly adapt to different driving scenarios and lighting conditions to ensure that the clarity and visibility of the virtual image are not affected.

[0049] In general, the present application embodiment provides a vehicle-mounted HUD system, see Figure 2 Through the unique optical architecture design, the same visual axis or highly fused display of near and far virtual images is achieved. Compared with the traditional up and down staggered display method, the image is more visually unified, avoiding the sense of image fragmentation, and significantly improving the driver's visual experience; the spatial overlap of near and far virtual images makes the image display more coherent. For example, the driver can obtain a road condition overview and instrument detail information at the same time within the same field of view without frequently switching lines of sight, which improves the efficiency and safety of information acquisition.

[0050] In some examples of this application, see Figure 2 , the beam splitter module 300 includes a beam splitter 301 and a reflector 302; the first light 102 emitted by the PGU system 100 passes through the first area 201 and is reflected by the reflector 302 to the beam splitter 301, and is projected to the windshield 500 after being partially reflected by the beam splitter 301. The windshield 500 reflects the first light 102 to the human eye 600, and at the same time, the reverse extension line of the first light 102 forms a distant virtual image 701 in front of the windshield 500;

[0051] The second light 103 emitted from the PGU system 100 passes through the second area 202 and partially passes through the beam splitter 301, and then is projected onto the windshield 500. The windshield 500 reflects the second light 103 to the human eye 600, and at the same time, the reverse extension line of the second light 103 forms a near-field virtual image 702 in front of the windshield 500.

[0052] The vehicle-mounted HUD system provided in the embodiment of the present application includes a diffusion film 200. Figure 2The diffusion film 200 is divided into at least two regions: a first region 201 and a second region 202. Each region processes the projected light differently to achieve separation and generation of a distant virtual image 701 and a near virtual image 702. This design simplifies the light propagation path, and allows different light rays: the first light 102 and the second light 103 to propagate in two different directions after being deflected and diffused. For example, the first light 102 can propagate to the reflector 302, and the second light 103 can propagate to the beam splitter 301.

[0053] See also Figure 2 The diffusion film 200, for example, is divided into an upper half (such as corresponding to the first area 201) and a lower half (such as corresponding to the second area 202). These two parts are used to adjust the angle and diffuse the light (such as the first light 102 and the second light 103) emitted from different positions on the PGU system 100 (such as the PGU system), and guide the light into different propagation paths according to different light positions.

[0054] The vehicle-mounted HUD system provided in an embodiment of the present application, the reflection system includes a spectroscope module 300, and the spectroscope module 300 includes a spectroscope 301 and a reflector 302. This module is one of the core optical components in the vehicle-mounted HUD system. Among them, the spectroscope 301, through its specific optical properties, can guide the light from different areas of the PGU system 100 to different optical paths respectively, while allowing part of the light to pass through or reflect. The reflector 302 is responsible for reflecting the first light 102 passing through the first area 201 to the spectroscope 301, and the spectroscope 301 reflects part of the first light 102, and then projects it to the windshield 500, thereby realizing the generation of a distant virtual image 701. The spectroscope 301 can directly transmit part of the second light 103 passing through the second area 202, and the second light 103 is projected to the windshield 500 to realize the generation of a near-field virtual image 702. The vehicle-mounted HUD system provided in the present application can realize spatial overlapping display of near and far virtual images by adding a beam splitter module 300.

[0055] The beam splitter 301 is used to realize partial reflection and transmission of light.

[0056] The reflector 302 is, for example, a high reflectivity mirror, which can increase the optical path of a specific optical path through reflection.

[0057] In order to realize the virtual image of the near and far scene, it is necessary to make the first light 102 passing through the first area 201 and the second light 103 passing through the second area 202 have a difference in optical path in the vehicle HUD system. Specifically, the first light 102 passing through the first area 201 is first received by the reflector 302, reaches the beam splitter 301 after reflection, and enters the human eye 600 through the windshield 500 after being partially reflected by the beam splitter 301. Compared with the second light 103 at the second area 202, since the reflector 302 increases the optical path at the first area 201 by folding the optical path, it is equivalent to the first area 201 being further away from the human eye 600. Figure 1 The secondary optical module 400 finally forms a distant virtual image 701.

[0058] The working principle of the vehicle-mounted HUD system provided in the embodiment of the present application is as follows:

[0059] The first light 102 and the second light 103 are respectively emitted from different positions (areas) of the PGU system 100 and projected onto different areas of the diffusion film 200: for example, the first light 102 is projected onto the first area 201 of the diffusion film 200, and the second light 103 is projected onto the second area 202 of the diffusion film 200. Through the ingenious layout of the beam splitter module 300, the light of the first area 201 is reflected twice (first by the reflector 302, and then by the beam splitter 301), increasing the optical path and forming a distant virtual image 701; while the light of the second area 202 is directly partially transmitted through the beam splitter 301 to form a near virtual image 702. These two light paths overlap in space in front of the windshield 500, thereby creating a more integrated image.

[0060] In some examples of this application, see Figure 2 The centers of the virtual images formed at different depths of field in front of the windshield 500 are all located on the visual axis of the human eye 600.

[0061] See also Figure 2 When the centers of the near-view virtual image 702 and the far-view virtual image 701 are both located on the visual axis of the human eye 600, the two images will visually present a higher degree of fusion. This is because the visual axis is the main direction of the eye's gaze and is also the most sensitive area of ​​visual perception. Aligning the centers of the far-view virtual image 701 and the near-view virtual image 702 here can reduce the visual abruptness and make the image more natural and coherent.

[0062] When the centers of the near-view virtual image 702 and the far-view virtual image 701 are both located on the visual axis of the human eye 600, the two images are visually offset or dispersed, reducing the burden on the human eye 600 when switching between different images, thereby improving viewing comfort. This is particularly important for drivers who use the vehicle-mounted HUD system for a long time.

[0063] In the driving scene, the information of the near-view virtual image and the far-view virtual image is closely related to the current state of the vehicle and the surrounding environment. Aligning the centers of the far-view virtual image 701 and the near-view virtual image 702 with the visual axis of the human eye 600 can ensure that the driver can quickly and accurately obtain this information, thereby improving driving safety and efficiency.

[0064] In general, aligning the centers of the near-field virtual image 702 and the far-field virtual image 701 on the visual axis of the human eye 600 can significantly improve the visual experience, information presentation effect, and technical implementation difficulty and accuracy of the vehicle HUD system. This design not only improves driving safety and efficiency, but also enhances the overall driving experience.

[0065] In some examples of this application, see Figure 2 The secondary optical module 400 is located on the optical path of the light propagated by the beam splitter 301 ; the secondary optical module 400 can reflect the light emitted by the beam splitter module 300 to the windshield 500 .

[0066] The vehicle-mounted HUD (Head-Up Display) system provided in the embodiment of the present application further includes a secondary optical module 400 in the reflection system. The introduction of the secondary optical module 400 can further optimize the light path and imaging quality.

[0067] In the vehicle-mounted HUD system provided in the embodiment of the present application: the diffusion film 200 is used to evenly diffuse the light from the PGU system 100 to ensure that the formed HUD image has a uniform brightness distribution before projection. The spectroscope module 300 is used to reflect and transmit the light at a specific angle to guide the light from different areas into the secondary optical module 400. The secondary optical module 400 is located behind the spectroscope module 300 and is located on the direct optical path of the light propagated by the spectroscope 301. Its main function is to receive the light after passing through the spectroscope module 300, and adjust the light again through a specific optical design (such as a reflector, etc.) and reflect it to the windshield 500. The windshield 500 reflects the light from the secondary optical module 400 into the driver's line of sight, forming two virtual images, including a distant virtual image 701 and a near virtual image 702.

[0068] From the perspective of the light path: the light is emitted from the PGU system 100, diffused by the diffusion film 200, and enters the spectrometer module 300. The spectrometer module 300 guides the light to the secondary optical module 400 along a predetermined path. In the secondary optical module 400, the light undergoes further optical adjustments (such as amplification, correction, etc.) to optimize the imaging quality and clarity. Finally, the adjusted light is reflected to the windshield 500 and enters the driver's field of view through the reflection of the windshield 500.

[0069] The secondary optical module 400 can more accurately control the propagation direction and distribution of light, thereby reducing light loss and distortion and improving the clarity and contrast of the HUD image, which is crucial to improving driving safety and information readability.

[0070] In summary, the secondary optical module 400 can further adjust the direction and focus of the light to ensure that the image can be clearly projected onto the windshield 500 .

[0071] In some examples of the present application, the secondary optical module 400 is a single free-form mirror, a free-form mirror group, or a free-form mirror and a plane reflective mirror group.

[0072] The secondary optical module 400 may be a single free-form mirror, see Figure 2 The free-form surface mirror can receive the light reflected and transmitted by the beam splitter 301 and reflect the light to the windshield 500. In this process, the image magnification function is realized.

[0073] The secondary optical module 400 includes but is not limited to using a single free-form surface mirror, and can also be a combination of two or more free-form surface mirrors. By combining multiple free-form surface mirrors, the degree of freedom of design can be further increased to achieve more complex optical transformation, correction and image magnification. This combination can optimize the imaging quality.

[0074] The secondary optical module 400 may also be a combination of a free-form surface mirror and a plane reflector. The combination of a free-form surface mirror and a plane reflector can utilize the simplicity and cost-effectiveness of a plane reflector while maintaining design flexibility. This combination may be suitable for certain specific application scenarios, such as scenarios that require reflection at a specific angle or folding of the light path.

[0075] In the present application, a free-form surface mirror is introduced into the secondary optical module 400. The design of the free-form surface mirror is usually more compact than that of a traditional spherical mirror, so the volume of the secondary optical module can be reduced, making it easier to integrate into the vehicle-mounted HUD system.

[0076] In some examples of this application, see Figure 2The first area 201 and the second area 202 are located on the same plane, and a shielding area 203 is set between the first area 201 and the second area 202.

[0077] In the vehicle-mounted HUD system provided in the embodiment of the present application, see Figure 2 A diffusion film 200 is designed to include a first region 201, a second region 202, and a shielding region 203 therebetween. This design is intended to optimize light distribution and imaging quality while reducing image interference.

[0078] See also Figure 1 The conventional diffusion membrane 200 is actually divided into two parts, which are staggered in front and back. This is completely different from the design of the diffusion membrane 200 in the present application.

[0079] The area division on the diffusion film 200 is specifically as follows:

[0080] The first area 201 and the second area 202 are located in the same plane, which helps to maintain the parallelism and consistency of light and reduce the light path distortion caused by different planes. The two areas can be used to display different HUD information, such as instrument panel information (including vehicle speed, etc.), navigation instructions, etc., and the information can be classified and displayed in an orderly manner through area division.

[0081] It should be noted that the first area 201 and the second area 202 are located in the same plane. This design can match a single PGU system to achieve clear image output.

[0082] Regarding the shielding area 203: the shielding area 203 is located between the first area 201 and the second area 202, and its main purpose is to prevent the light of the first area 201 and the second area 202 from crossing, so as to avoid image interference.

[0083] The shielding area 203 may be a physical structure. Figure 1 The physical structure is arranged on a side of the diffusion film 200 close to the beam splitter module 300 and between the first area 201 and the second area 202. Specifically, the shielding area 203 can be realized by adding an opaque material or coating on the diffusion film 200.

[0084] Of course, the shielding area 203 may also be realized by software, that is, by inputting a black image UI to form an image black band.

[0085] The above design provides multiple ways to implement the shielding area 203, including physical shielding and software shielding. This flexibility allows the design of the vehicle-mounted HUD system to be adjusted and optimized according to actual needs to adapt to the needs of different vehicle models and driving environments.

[0086] By adding a shielding area 203 between the first area 201 and the second area 202 on the diffusion film 200, image interference can be reduced. Specifically, the shielding area 203 effectively isolates the first light 102 of the first area 201 and the second light 103 of the second area 202, avoiding the interlacing and overlapping between them, thereby reducing image interference. This makes the HUD information clearer and more accurate, and improves the driver's ability to recognize information. Clear HUD information display and reduced image interference help enhance the driver's driving experience. The driver can focus more on the road conditions while quickly obtaining the required driving information, improving driving safety and comfort.

[0087] In the vehicle-mounted HUD system provided in the embodiment of the present application, in order to achieve spatial overlap of the distant virtual image 701 and the near virtual image 702 , it is necessary to make the first area 201 and the second area 202 on the diffusion film 200 overlap and cover each other in the optical path in the secondary optical module 400 .

[0088] In this regard, it should be noted that the diffusion film 200, as an optical element, has the main function of evenly diffusing light, improving light utilization and imaging quality. In the vehicle-mounted HUD system provided in the present application, the diffusion film 200 is divided into a first area 201 and a second area 202, which correspond to the light sources for generating a distant virtual image 701 and a near virtual image 702, respectively. Next, consider the necessity of light path overlap. In order to achieve visual spatial overlap of the distant virtual image 701 and the near virtual image 702, that is, to make the two virtual images look like images in the same spatial position but with different depths within the same viewing angle range, it is necessary to ensure that their light can intersect in a specific way during propagation. This is light path overlap.

[0089] In order to achieve this, a secondary optical module 400 is designed in the vehicle-mounted HUD system of the present application. The secondary optical module 400 adjusts the propagation path and angle of the light. Specifically, the secondary optical module 400 receives the first light 102 from the first area 201 and the second light 103 from the second area 202 on the diffusion film 200, and reflects or focuses these light rays through the optical elements inside it, so that the light rays of the distant view and the near view that were originally misplaced can overlap in some way inside the system, and finally form two virtual images that overlap in space in front of the windshield 500.

[0090] In some examples of the present application, the first region 201 has a first microstructure, the second region 202 has a second microstructure, and the first microstructure is different from the second microstructure; the first microstructure can cause the projected first light 102 to be propagated toward the reflector 302 after being angle modulated, and the second microstructure can cause the projected second light 103 to be propagated toward the beam splitter 301 after being angle modulated.

[0091] Since the first light 102 passing through the first area 201 and the second light 103 passing through the second area 202 have different directions, their microstructures need to be different to achieve different light angle modulations to ensure that different light rays can propagate along the expected paths.

[0092] By designing different microstructures in the first region 201 and the second region 202 of the diffusion film 200 , respectively, the propagation directions of the first light 102 and the second light 103 can be accurately controlled.

[0093] Specifically, the first microstructure of the first region 201 ensures that the first light 102 is directly transmitted toward the reflector 302 after light angle modulation (angle modulation includes angle deflection and diffusion angle adjustment), while the second microstructure of the second region 202 enables the second light 103 to be transmitted toward the beam splitter 301 after light angle modulation (angle modulation includes angle deflection and diffusion angle adjustment). In other words, after passing through two different microstructures, the first light 102 and the second light 103 can be separated into two different paths for transmission.

[0094] By precisely controlling the propagation direction and angle of light, the loss of light during propagation can be reduced, thereby improving the overall optical efficiency of the vehicle HUD system.

[0095] In some examples of this application, see Figure 1 The reflector 302 and the beam splitter 301 are tilted, and the beam splitter 301 is located on the reflection path of the reflector 302 , and the light projected onto the beam splitter 301 can be incident on the secondary optical module 400 .

[0096] For the beam splitter module 300, the vehicle-mounted HUD system can flexibly control the propagation path of light by adjusting the angle and distance between the beam splitter 301 and the reflector 302, thereby adjusting the distance of the near and far virtual images. This flexibility enables the entire vehicle-mounted HUD system to adapt to different visual needs and application scenarios, and can adjust the display distance of the near and far virtual images according to the user's visual experience or system requirements.

[0097] In the example provided in this application, it is mentioned that the first area 201 and the second area 202 on the diffusion film 200 can be adjusted according to the near-far virtual image ratio of the system. This means that by changing the size, shape or microstructure characteristics of the two areas, the distribution and focus of light can be further finely controlled, thereby optimizing the magnification ratio of the two virtual images.

[0098] The tilted reflector 302 and beam splitter 301 help reduce the loss and interference of light during propagation, improve the utilization of light and the overall optical performance of the system. At the same time, by precisely controlling the position and angle of these components, optical defects such as aberration and distortion can be further reduced, and the clarity and quality of the image can be improved.

[0099] In some examples of the present application, the beam splitter 301 includes a semi-reflective and semi-transmissive beam splitter, a polarization beam splitter or a band filter.

[0100] A semi-reflective and semi-transparent beam splitter is an optical element that can reflect and transmit incident light in a certain proportion. The surface of this beam splitter is coated with a special semi-reflective and semi-transparent film, so that when the light reaches the surface, part of it is reflected and the other part is transmitted. The reflectivity and transmittance of this beam splitter can be precisely controlled by adjusting the thickness and refractive index of the film to meet different optical requirements. In the vehicle-mounted HUD system provided in an embodiment of the present application, the semi-reflective and semi-transparent beam splitter can be used to transmit part of the light reflected by the reflector 302 to the secondary optical module 400.

[0101] A polarizing beam splitter is an optical element that splits light based on the polarization state of light. It can selectively reflect or transmit light according to the polarization direction of the light (such as horizontal polarization or vertical polarization). For example, a polarizing beam splitter can be made of one or more polarization-sensitive optical materials, such as a polarizer, a polarizing prism, etc. In the HUD system provided in an embodiment of the present application, if a polarized light source is used or the polarization state of light needs to be controlled, a polarizing beam splitter can be used to achieve specific optical effects, such as improving the contrast of an image or eliminating interference light.

[0102] A band filter is an optical element that only allows light within a specific wavelength range to pass through, while blocking light of other wavelengths. It achieves a filtering effect by absorbing or reflecting light of non-target wavelengths. Parameters such as the transmission wavelength range, center wavelength, and bandwidth of the band filter can be designed and customized according to specific needs. In the vehicle-mounted HUD system provided in the embodiment of the present application, if it is necessary to filter a specific color or wavelength of the light source, a band filter can be used to achieve this purpose.

[0103] The beam splitter 301 adopts a semi-reflective and semi-transmissive beam splitter, a polarizing beam splitter or a band filter. Suitable optical elements can be selected according to the specific requirements and application scenarios of the vehicle-mounted HUD system to achieve precise optical control and optimized imaging effects.

[0104] In some examples of the present application, the PGU system 100 is any one of a TFT system, a DLP system and a LCOS system.

[0105] The PGU system 100 is the image source of the entire vehicle-mounted HUD system, also known as an image generator. Among the three systems mentioned in the above examples, TFT technology is known for its directness and efficiency. It can directly illuminate the pixels through the built-in backlight system, and then seamlessly connect to the subsequent precision optical system, without additional conversion steps, to generate clear and vivid virtual images. This process not only simplifies the imaging path, but also ensures high image fidelity and accurate color reproduction.

[0106] In contrast, LCOS and DLP systems use more complex imaging mechanisms. These systems rely on passive illumination from external light sources and construct delicate image contours by precisely controlling the light transmission or reflection state of each pixel.

[0107] Among them, DLP technology uses digital micromirror chips. DLP systems usually use a reflective principle and a smaller optical path system, making the device more compact and portable. Today, with the addition of laser technology, the brightness of DLP projectors has been greatly improved, and the color performance is also better.

[0108] Among them, LCOS technology uses silicon-based liquid crystal technology to modulate light by controlling the on-off state of the liquid crystal layer to achieve image projection. This technology has the advantages of high resolution and high light source utilization. The LCOS system usually adopts a three-chip structure to process red, green and blue light respectively, and synthesize color images through a precise optical system.

[0109] In some examples of this application, see Figure 1 The PGU system 100 is configured as a single unit, and the PGU system 100 includes a PGU module 101; the PGU module 101 is configured to be divided into at least a first light-emitting area and a second light-emitting area according to regions; the first light-emitting area is used to emit the first light 102; the second light-emitting area is used to emit the second light 103.

[0110] It should be noted that the first area 201 and the second area 202 are located in the same plane. This design can match a single PGU system to achieve clear image output.

[0111] The vehicle-mounted HUD system provided in the embodiment of the present application realizes the seamless integration of near and far virtual images in the visual space, bringing an immersive visual experience to the user. The vehicle-mounted HUD system uses the principle of spatially overlapping double virtual image technology, wherein the PGU module 101 is used as an image light source, and the light emitted by it is carefully distributed to different areas of the diffusion film 200: the first light 102 is focused on the first area 201 (upper half) of the diffusion film 200, and the second light 103 is projected on the second area 202 (lower half) of the diffusion film 200.

[0112] In order to achieve accurate construction of near and far virtual images, the vehicle-mounted HUD system cleverly introduces an optical path difference mechanism, that is, the beam splitter module 300 located between the diffusion film 200 and the secondary optical module 400, especially the beam splitter 301 therein, becomes the key to this mechanism. The beam splitter 301 not only allows part of the light to pass through and directly project to the human eye 600 through the secondary optical module 400 and the windshield 500 to form a near-field virtual image 702 (the second light 103 originating from the second area 202), but also through the synergy with the reflector 302, the first light originating from the first area 201 is reflected twice, significantly extending its optical path, thereby forming a far-field virtual image 701 in the human eye. This design enables the light from the first area 201 and the second area 202, which were originally on the same plane, to achieve depth separation in visual perception, creating a realistic near and far virtual image effect.

[0113] To further optimize the imaging quality, the microstructures of the first area 201 and the second area 202 on the diffusion film 200 are carefully designed to adapt to different light modulation requirements to ensure that the light is accurately propagated along a predetermined path. At the same time, in order to prevent the light from the first area 201 and the second area 202 from intersecting and causing image interference, a shielding area 203 is specially set between the two to effectively isolate the interfering light.

[0114] In addition, the angle and distance configuration between the beam splitter 301 and the reflector 302, as well as the division ratio between the first area 201 and the second area 202, can be flexibly adjusted according to the specific requirements of the vehicle-mounted HUD system to accurately control the distance ratio and display effect of the far and near virtual images, thereby ensuring the clarity and realism of the image.

[0115] According to another embodiment of the present application, a vehicle is further provided, the vehicle comprising a vehicle body and the vehicle-mounted HUD system as described above, the vehicle body comprising a windshield 500, and the vehicle-mounted HUD system is arranged on the vehicle body.

[0116] The specific implementation of the vehicle in the embodiment of the present application can refer to the above-mentioned embodiments of the vehicle-mounted HUD system, 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.

[0117] 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.

[0118] 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 vehicle-mounted HUD system, characterized in that: It comprises a PGU system (100), a diffusion film (200) and a reflection system which are arranged in sequence; The diffusion film (200) comprises a first region (201) and a second region (202); The reflection system comprises a beam splitter module (300) and a secondary optical module (400), wherein the beam splitter module (300) is located between the diffusion film (200) and the secondary optical module (400); Light rays emitted from different areas of the PGU system (100) pass through the first area (201) and the second area (202) respectively, and are then reflected by the reflection system to the windshield (500) of the vehicle. The windshield (500) is capable of reflecting the light rays to the human eye (600), and at the same time, the reverse extension lines of the light rays form virtual images at different depths of field in front of the windshield (500); The centers of the virtual images formed at different depths of field in front of the windshield (500) are all located on the visual axis of the human eye (600); The beam splitter module (300) comprises a beam splitter (301) and a reflector (302); The first region (201) has a first microstructure, the second region (202) has a second microstructure, and the first microstructure is different from the second microstructure; The first microstructure can cause the projected first light (102) to propagate towards the reflector (302) after being angle modulated, and the second microstructure can cause the projected second light (103) to propagate towards the beam splitter (301) after being angle modulated.

2. The vehicle-mounted HUD system according to claim 1, characterized in that: The first light ray (102) emitted by the PGU system (100) passes through the first area (201) and is reflected by the reflector (302) to the beam splitter (301). After being partially reflected by the beam splitter (301), the first light ray (102) is projected to the windshield (500). The windshield (500) reflects the first light ray (102) to the human eye (600). Meanwhile, the reverse extension line of the first light ray (102) forms a distant virtual image (701) in front of the windshield (500); The second light ray (103) emitted by the PGU system (100) passes through the second area (202) and then partially passes through the beam splitter (301), and is then projected onto the windshield (500). The windshield (500) reflects the second light ray (103) toward the human eye (600), and at the same time, a reverse extension line of the second light ray (103) forms a near-field virtual image (702) in front of the windshield (500).

3. The vehicle-mounted HUD system according to claim 2, characterized in that: The secondary optical module (400) is located on the optical path of the light propagated by the beam splitter (301), and the secondary optical module (400) is capable of reflecting the light emitted by the beam splitter (301) to the windshield (500).

4. The vehicle-mounted HUD system according to claim 1, characterized in that: The secondary optical module (400) is a single free-form surface mirror, a free-form surface mirror group, or a free-form surface mirror and a plane reflecting mirror group.

5. The vehicle-mounted HUD system according to claim 1, characterized in that: The first area (201) and the second area (202) are located on the same plane, and a shielding area (203) is provided between the first area (201) and the second area (202).

6. The vehicle-mounted HUD system according to claim 2, characterized in that: The reflector (302) and the beam splitter (301) are arranged at an angle, and the beam splitter (301) is located on a reflection path of the reflector (302), so that light projected onto the beam splitter (301) can be incident on the secondary optical module (400).

7. The vehicle-mounted HUD system according to claim 2, characterized in that: The beam splitter (301) comprises a semi-reflective and semi-transmissive beam splitter, a polarizing beam splitter or a band filter.

8. The vehicle-mounted HUD system according to claim 1, characterized in that: The PGU system (100) is any one of a TFT system, a DLP system and an LCOS system.

9. The vehicle-mounted HUD system according to claim 2, characterized in that: The PGU system (100) is configured as a single unit, and the PGU system (100) comprises a PGU module (101); The PGU module (101) is configured to be divided into at least a first light-emitting area and a second light-emitting area according to different positions, wherein the first light-emitting area is used to emit the first light (102), and the second light-emitting area is used to emit the second light (103).

10. A vehicle, characterized in that: include: A vehicle body, including a windshield (500); and The vehicle-mounted HUD system as described in any one of claims 1 to 9, wherein the vehicle-mounted HUD system is arranged on the vehicle body.

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