CN118560273B

CN118560273B - Vehicle HUD system and vehicle

Info

Publication number: CN118560273B
Application number: CN202411038311.7A
Authority: CN
Inventors: 方帆; 姜龙; 张廷瑞; 刘治新; 汪明强; 郑骁
Original assignee: Goertek Optical Technology Co Ltd
Current assignee: Goertek Optical Technology Co Ltd
Priority date: 2024-07-31
Filing date: 2024-07-31
Publication date: 2025-01-10
Anticipated expiration: 2044-07-31
Also published as: CN118560273A

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

Vehicle-mounted HUD system and vehicle

Technical Field

The embodiment of the application relates to the technical field of vehicle-mounted display, in particular to a vehicle-mounted HUD system and a vehicle.

Background

With the rapid development of automobile technology, a Head Up Display (HUD) is an important component of an advanced driving assistance system (ADVANCED DRIVER ASSISTANCE SYSTEMS, ADAS), and plays an important role in improving driving safety and convenience. In order to further improve the richness of information presentation and the sense of reality of visual experience, a double-virtual-image vehicle-mounted HUD system has been developed, which innovatively adopts a near-far double-virtual-image design and aims at displaying different types of driving information in different areas. Referring to the vehicle-mounted HUD system with double virtual images shown in fig. 1, after the projection light is amplified by the secondary optical module 400 through the optical layout, a clear virtual image is finally formed in front of the human eye 600 through reflection of the windshield 500, wherein the long-range virtual image 701 is set outside 7.5m, and the short-range virtual image 702 is close to a distance of about 3m, so that dual display of road condition overview and instrument details is realized.

The vehicle-mounted HUD system with double virtual images on the current market commonly adopts the display mode with the vertical dislocation, and the layered display of information is realized, but the unavoidable sense of rupture is also caused visually. Such non-uniform display modes not only affect the driver's rapid capture and understanding of information, but may also impair the smooth visual experience of driving to some extent.

Disclosure of Invention

The application aims to provide a vehicle-mounted HUD system and a novel technical scheme of a vehicle.

In a first aspect, an embodiment of the present application provides a vehicle-mounted HUD system. The vehicle-mounted HUD system comprises a PGU system, a diffusion film and a reflection system which are sequentially arranged;

The diffusion film comprises a first region and a second region;

the reflection system comprises a spectroscope module and a secondary optical module, and the spectroscope module is positioned between the diffusion film and the secondary optical module;

Light rays emitted from different areas of the PGU system are reflected to a windshield of a vehicle by the reflecting system after passing through the first area and the second area respectively, the windshield can reflect the light rays to human eyes, and meanwhile, virtual images are formed at different depth positions in front of the windshield by reverse extension lines of the light rays.

Optionally, the spectroscope module includes a spectroscope and a reflecting mirror;

The first light emitted by the PGU system is reflected to the spectroscope by the reflecting mirror after passing through the first area, and is projected to the windshield after being reflected by the spectroscope part, the windshield reflects the first light to human eyes, and meanwhile, a long-range virtual image is formed in front of the windshield by the reverse extension line of the first light;

the second light emitted by the PGU system passes through the second area and then partially penetrates through the spectroscope, and then is projected to the windshield, the windshield reflects the second light to human eyes, and meanwhile, a reverse extension line of the second light forms a near-view virtual image in front of the windshield.

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

Optionally, the secondary optical module is located on an optical path of the light beam transmitted by the beam splitter, and the secondary optical module can reflect the light beam emitted by the beam splitter to the windshield.

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 mirror group.

Optionally, the first area and the second area are located on the same plane, and a shielding area is arranged between the first area and the second area.

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;

the first microstructure can enable the projected first light to propagate towards the reflecting mirror after angle modulation, and the second microstructure can enable the projected second light to propagate towards the spectroscope after angle modulation.

Optionally, the reflecting mirror and the beam splitter are disposed obliquely, and the beam splitter is located on a reflection path of the reflecting mirror, and the light projected to the beam splitter can be incident to the secondary optical module.

Optionally, the spectroscope includes a semi-reflective and semi-transmissive spectroscope, a polarizing spectroscope or a band filter.

Optionally, the PGU system is any one of a TFT system, a DLP system, and an LCOS system.

Optionally, the PGU system is set as a single PGU system, and the PGU system includes a PGU module;

The PGU module is arranged 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 for emitting the first light, and the second light-emitting area is used for emitting the second light.

In a second aspect, an embodiment of the present application provides a vehicle including:

Vehicle body including a windshield, and

The vehicle-mounted HUD system of the first aspect, the vehicle-mounted HUD system being disposed in the vehicle body.

The beneficial effects of the application are as follows:

The embodiment of the application provides a vehicle-mounted HUD system, which realizes the coaxial or high-fusion display of far and near virtual images through a unique optical architecture design, compared with the traditional up-and-down staggered display mode, the images are more uniform in vision, the image splitting sense is avoided, the visual experience of a driver is obviously improved, the space overlapping of the far and near virtual images enables the image display to be more coherent, the driver can acquire the road condition overview and instrument detail information at the same time in the same visual field range, the frequent sight switching is not needed, and the information acquisition efficiency and safety are improved.

Other features of the present specification and its advantages will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

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

Fig. 1 is a schematic structural diagram of a conventional vehicle-mounted HUD system;

Fig. 2 is a schematic structural diagram of a vehicle-mounted HUD system according to an embodiment of the present application.

Reference numerals illustrate:

100. The system comprises a PGU system, 101, a PGU module, 102, a first light, 103, a second light, 200, a diffusion film, 201, a first area, 202, a second area, 203, a shielding area, 300, a spectroscope module, 301, a spectroscope, 302, a reflecting mirror, 400, a secondary optical module, 500, a windshield, 600, a human eye, 701, a long-range view virtual image, 702 and a short-range view virtual image.

Detailed Description

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

The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses.

Techniques and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.

In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.

It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

The following describes in detail the vehicle-mounted HUD system and the vehicle provided by the embodiments of the present application with reference to the accompanying drawings.

According to an embodiment of the present application, referring to fig. 2, there is provided a vehicle-mounted HUD system, where the vehicle-mounted HUD system includes a PGU system 100, a diffusion film 200 and a reflection system sequentially disposed, the diffusion film 200 includes a first area 201 and a second area 202, the reflection system includes a beam splitter module 300 and a secondary optical module 400, 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 respectively pass through the first area 201 and the second area 202 and then are reflected by the reflection system to a windshield 500 of a vehicle, the windshield 500 can reflect the light rays to a human eye 600, and meanwhile, reverse extension lines of the light rays form virtual images at different depths of field in front of the windshield 500.

The vehicle-mounted HUD system provided by the embodiment of the present application shows a smart optical structural design, particularly, the reflection system is introduced after the diffusion film 200, and the reflection system includes a specially designed spectroscope module 300 and a secondary optical module 400, so that the spatial overlapping display of the far-view virtual image 701 and the near-view virtual image 702 (i.e. the coaxial display of the far-view virtual image and the near-view virtual image) is finally realized, thereby improving the information display effect and the visual experience in the driving process.

It should be noted that, the same diffusion film 200 is divided into at least two regions, namely, a first region 201 and a second region 202, each of which has different processing manners for the projected light, so as to separate and generate the far-view virtual image 701 and the near-view virtual image 702. The design simplifies the light propagation path, so that different light rays can propagate towards two different directions after being deflected and diffused by angles, and finally virtual images with different depth of field can be formed.

The vehicle-mounted HUD system provided by the embodiment of the application comprises a PGU system 100. The PGU system 100 serves as a source of image generation (also referred to as an image generator) and is responsible for generating image light containing road condition overview and instrument detail information. The image light rays are carefully regulated and controlled, and finally are output in a form suitable for subsequent optical processing to form virtual images with different depths of field.

When the conventional vehicle-mounted HUD system has the function of presenting the far and near Jing Xuxiang, the far and near Jing Xuxiang is staggered up and down in space, see fig. 1, and thus the image has obvious cracking sense. The vehicle-mounted HUD system provided by the embodiment of the application realizes the coaxial display effect of the near-far Jing Xuxiang, and the design eliminates the cracking sense caused by the misplacement of the images in the traditional vehicle-mounted HUD system, so that the near-far image information is more coherent and unified in vision, and the visual experience of a driver is improved.

The vehicle HUD system provided by the embodiment of the application also relates to the participation of the windshield 500. The windshield 500 is, for example, a front windshield of a vehicle, and as a final optical reflection surface, the windshield 500 not only protects occupants in the vehicle, but also performs the task of reflecting projected light to the human eye 600. The windshield 500 ensures clarity and visibility of the near-far Jing Xuxiang by its high light transmission and good reflective properties.

With respect to the human eye 600 shown in fig. 2, it is the driver's eye. The human eye 600 receives and observes the information of the long-range virtual image 701 and the short-range virtual image 702 reflected by the windshield 500, so as to realize the instant perception of the key information such as road condition overview, instrument detail information and the like by the driver.

The vehicle-mounted HUD system provided by the embodiment of the application, referring to fig. 2, has the function of coaxial display of the near-far Jing Xuxiang, not only improves the visual continuity of a driver, but also enhances the real perception effect of depth information through virtual images with different distances. The driver can more intuitively understand the hierarchical relationship between the information, and the readability and the understanding speed of the information are improved.

In addition, by adjusting 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 scenes and light conditions, and ensures that the definition and visibility of the virtual image are not affected.

In general, the embodiment of the application provides a vehicle-mounted HUD system, referring to fig. 2, through a unique optical architecture design, the coaxial or high-fusion display of far and near virtual images is realized, compared with the traditional up and down staggered display mode, the images are more uniform in vision, the image splitting sense is avoided, the visual experience of a driver is remarkably improved, the space overlapping of the far and near virtual images enables the image display to be more coherent, the driver can acquire road condition overview and instrument detail information at the same time in the same visual field range, the frequent sight switching is not needed, and the information acquisition efficiency and safety are improved.

In some examples of the present application, referring to fig. 2, the beam splitter module 300 includes a beam splitter 301 and a reflecting mirror 302, wherein the first light ray 102 emitted from the PGU system 100 passes through the first region 201 and then is reflected by the reflecting mirror 302 to the beam splitter 301, and is reflected by the beam splitter 301 to be projected to the windshield 500, and the windshield 500 reflects the first light ray 102 to the human eye 600, and meanwhile, a reverse extension line of the first light ray 102 forms a long-range virtual image 701 in front of the windshield 500;

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

The vehicle HUD system provided by the embodiment of the application comprises a diffusion film 200. Referring to fig. 2, the diffusion film 200 is divided into at least two regions, namely a first region 201 and a second region 202, each of which processes the projected light differently, so as to separate and generate the far-view virtual image 701 and the near-view virtual image 702. This design simplifies the light propagation path, and allows different light rays, i.e., the first light ray 102 and the second light ray 103, to propagate in two different directions after being angularly deflected and diffused, e.g., the first light ray 102 may propagate to the mirror 302, and the second light ray 103 may propagate to the beam splitter 301.

Referring to fig. 2, the diffusion film 200 is divided into an upper half (corresponding to a first area 201) and a lower half (corresponding to a second area 202), and the two parts are used for respectively performing angle adjustment and light diffusion on light rays (such as a first light ray 102 and a second light ray 103) emitted at different positions on the PGU system 100 (such as a PGU system), and guiding the light rays into different propagation paths according to the different light ray positions.

In the vehicle-mounted HUD system provided by the embodiment of the present application, the reflection system includes a beam splitter module 300, the beam splitter module 300 includes a beam splitter 301 and a reflecting mirror 302, and this module is one of the core optical elements in the vehicle-mounted HUD system. The beam splitter 301, through its specific optical characteristics, can direct the light from different areas of the PGU system 100 to different optical paths, while allowing some light to pass through or reflect. The reflecting mirror 302 is responsible for reflecting the first light ray 102 passing through the first area 201 to the beam splitter 301, and the beam splitter 301 reflects part of the first light ray 102 and then projects the reflected first light ray to the windshield 500, so as to generate a long-range virtual image 701. The beam splitter 301 may directly transmit a portion of the second light 103 passing through the second region 202, where the second light 103 is projected onto the windshield 500, so as to generate a near virtual image 702. According to the vehicle-mounted HUD system provided by the application, the space overlapping display of the far and near virtual images can be realized by adding the spectroscope module 300.

Wherein, the beam splitter 301 is used for realizing partial reflection and transmission of light.

The reflecting mirror 302 is, for example, a high reflecting mirror with high reflectivity, and the optical path length of a specific optical path can be increased by reflection.

To achieve the near-far Jing Xuxiang, the first light ray 102 passing through the first region 201 needs to have an optical path difference with the second light ray 103 passing through the second region 202 in the vehicle HUD system. Specifically, the first light ray 102 passing through the first area 201 is first received by the reflecting mirror 302, then reflected to the beam splitter 301, and then partially reflected by the beam splitter 301, and then enters the human eye 600 through the windshield 500. Compared with the second light ray 103 in the second area 202, since the optical path length of the first area 201 is increased by the reflection mirror 302 through the folding of the optical path, the first area 201 is far away from the secondary optical module 400 in fig. 1, and finally, a long-range virtual image 701 is formed.

The vehicle-mounted HUD system provided by the embodiment of the application has the following working principle:

The PGU system 100 emits a first light ray 102 and a second light ray 103 at different positions (regions) and projects the first light ray 102 onto a first region 201 of the diffusion film 200, and the second light ray 103 projects the second region 202 of the diffusion film 200. Through the smart layout of the beam splitter module 300, the light in the first region 201 is reflected twice (by the reflecting mirror 302 and then by the beam splitter 301), so as to increase the optical path and form a long-range virtual image 701, and the light in the second region 202 is directly partially transmitted through the beam splitter 301 and forms a short-range virtual image 702. These two light paths are spatially superimposed in front of the windshield 500, creating an image with a higher degree of fusion.

In some examples of the application, referring to fig. 2, the centers of 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.

Referring to fig. 2, when the centers of both the near and far virtual images 702, 701 are located on the visual axis of the human eye 600, the two images visually exhibit a higher degree of fusion. This is because the visual axis is the primary direction of eye gaze and is also the most visually perceived sensitive area. Aligning the centers of the far and near virtual images 701, 702 can reduce the sense of visual distraction, making the image more natural and coherent.

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 above-mentioned two images are prevented from being offset or dispersed in vision, and the burden of the human eye 600 when switching between different images is reduced, thereby improving the viewing comfort. This is particularly important for drivers who use in-vehicle HUD systems for long periods of time.

In a driving scene, information of a near view virtual image and a far view virtual image is closely related to the current state of the vehicle and the surrounding environment. Aligning the centers of the long-view virtual image 701 and the short-view virtual image 702 to the visual axis of the human eye 600 can ensure that the driver can quickly and accurately acquire the information, and improve the driving safety and efficiency.

In general, aligning the centers of the near Jing Xuxiang and far view virtual images 701 on the visual axis of the human eye 600 can significantly improve the visual experience, information presentation effect, and difficulty and accuracy of technical implementation of the vehicle-mounted HUD system. The design not only improves the safety and efficiency of driving, but also enhances the overall experience of driving.

In some examples of the application, referring to fig. 2, the secondary optical module 400 is located on the optical path of the light propagating through the beam splitter 301, and the secondary optical module 400 can reflect the light exiting from the beam splitter module 300 to the windshield 500.

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

In the vehicle-mounted HUD system provided by the embodiment of the present application, the diffusion film 200 is used to uniformly diffuse the light from the PGU system 100, so as to ensure that the formed HUD image has uniform brightness distribution before projection. The beam splitter module 300 is configured to reflect and transmit light rays according to a specific angle, so as to guide the light rays in different areas to enter the secondary optical module 400. The secondary optical module 400 is located behind the beam splitter module 300 and on the direct optical path of the beam splitter 301 for transmitting light, and has the main functions of receiving the light passing through the beam splitter module 300, and re-adjusting the light by a specific optical design (such as a mirror, etc.) and reflecting the light to the windshield 500. The windshield 500 reflects light from the secondary optical module 400 into the driver's line of sight, forming two virtual images, including a far virtual image 701 and a near virtual image 702.

From the light path, the light is emitted from the PGU system 100, diffused by the diffusion film 200, and enters the beam splitter module 300, the beam splitter module 300 directs the light to the secondary optical module 400 according to a predetermined path, and in the secondary optical module 400, the light is further optically adjusted (e.g. amplified, corrected, etc.) to optimize the imaging quality and definition, and finally, the adjusted light is reflected to the windshield 500 and enters the driver's view through the reflection of the windshield 500.

The secondary optical module 400 can more precisely control the propagation direction and distribution of light, thereby reducing light loss and distortion and improving the definition and contrast of HUD images. This is important for improving driving safety and information readability.

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

In some examples of the application, the secondary optical module 400 is a single free-form mirror, a free-form mirror set, or a free-form mirror and planar mirror set.

The secondary optical module 400 may be a single free-form surface mirror, and referring to fig. 2, the free-form surface mirror is capable of receiving the light reflected and transmitted by the beam splitter 301 and reflecting the light to the windshield 500, and in this process, an image magnifying function is implemented.

The secondary optic module 400 includes, but is not limited to, the use of a single free-form surface mirror, but may also be a combination of two or more free-form surface mirrors. By combining multiple freeform mirrors, the degree of freedom of design can be further increased, enabling more complex optical transformations, corrections, and image magnification. This combination can optimize the imaging quality.

The secondary optical module 400 may also be a combination of free-form surface mirrors and planar mirrors. The use of free-form mirrors in combination with planar mirrors can take advantage of the simplicity and cost effectiveness of planar mirrors while maintaining design flexibility. This combination may be suitable for certain applications, such as those requiring specific angle reflections or folded light paths.

In the present application, the free-form surface mirror is introduced into the secondary optical module 400, and the design of the free-form surface mirror is generally more compact than that of the conventional spherical mirror, so that the volume of the secondary optical module can be reduced, and the secondary optical module is easier to integrate into the vehicle-mounted HUD system.

In some examples of the present application, referring to fig. 2, the first region 201 and the second region 202 are located on the same plane, and an occlusion region 203 is disposed between the first region 201 and the second region 202.

In the vehicle-mounted HUD system provided in the embodiment of the present application, referring to fig. 2, one diffusion film 200 is designed to include a first region 201, a second region 202, and a shielding region 203 therebetween. This design aims to optimize the distribution of light and imaging quality while reducing image disturbances.

Referring to fig. 1, a conventional diffusion membrane 200 is actually divided into two parts, which are arranged in a front-back staggered manner. This is quite different from the diffusion membrane 200 design of the present application.

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

The first region 201 and the second region 202 are located on the same plane, which helps to maintain parallelism and consistency of light, and reduce distortion of the optical path caused by different planes. The two areas can be used for displaying different HUD information, such as instrument panel information (including vehicle speed and the like), navigation instructions and the like, and the information is classified and orderly displayed through area division.

It should be noted that, the first area 201 and the second area 202 are located on the same plane, and the design may be matched to a single PGU system to implement clear output of images.

Regarding the occlusion area 203, the occlusion area 203 is located between the first area 201 and the second area 202, the main purpose of which is to prevent the light rays of the first area 201 and the second area 202 from being interlaced, thereby avoiding image interference.

Wherein the occlusion region 203 may be a physical structure. For example, referring to fig. 1, the physical structure is disposed on a side of the diffusion membrane 200 adjacent to the spectroscopic module 300 and between the first region 201 and the second region 202. Specifically, the blocking area 203 may be implemented by adding an opaque material or coating on the diffusion film 200.

Of course, the shielding area 203 may be implemented by software, that is, by inputting a black image UI to form an image black band.

The above design provides a variety of ways to implement the occlusion region 203, including physical occlusion and software occlusion. The flexibility enables the design of the vehicle-mounted HUD system to be adjusted and optimized according to actual requirements so as to adapt to requirements of different vehicle types and driving environments.

By adding a masking region 203 between the first region 201 and the second region 202 on the diffusion film 200, image interference can be reduced. In particular, the blocking area 203 effectively isolates the first light ray 102 of the first area 201 and the second light ray 103 of the second area 202 from interleaving and overlapping therebetween, thereby reducing image interference. Therefore, HUD information is clearer and more accurate, and the recognition capability of a driver on the information is improved. Clear HUD information display and reduced image interference help to promote the driving experience of a driver. The driver can concentrate on the road condition more, acquires required driving information fast simultaneously, improves driving safety and travelling comfort.

In the vehicle-mounted HUD system provided by the embodiment of the present application, in order to implement spatial overlapping of the long-view virtual image 701 and the short-view virtual image 702, the first area 201 and the second area 202 on the diffusion film 200 need to overlap and cover the optical paths in the secondary optical module 400.

In this regard, the diffusion film 200 serves as an optical element, and has a main function of uniformly diffusing light, thereby improving the light utilization and imaging quality. In the vehicle-mounted HUD system provided by the present application, the diffusion film 200 is divided into a first region 201 and a second region 202, which respectively correspond to the light sources for generating the far view virtual image 701 and the near view virtual image 702. Next, consider the necessity of optical path overlap coverage. In order to achieve a visual spatial overlap of the far 701 and near 702 virtual images, i.e. to make the two virtual images appear to be images at the same spatial location but with different depths within the same viewing angle range, it is necessary to ensure that their rays can meet in a specific way during propagation. This is the optical path overlap coverage.

To achieve this, a secondary optical module 400 is designed in the in-vehicle 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 ray 102 from the first region 201 and the second light ray 103 from the second region 202 on the diffusion film 200, and reflects or focuses the light rays through the optical elements inside the secondary optical module, so that the light rays of the distant view and the close view, which are originally respectively misplaced, can overlap in some way inside the system, and finally form two virtual images that are spatially overlapped in front of the windshield 500.

In some examples of the 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 is capable of enabling the projected first light ray 102 to propagate toward the reflecting mirror 302 after being angle modulated, and the second microstructure is capable of enabling the projected second light ray 103 to propagate toward the beam splitter 301 after being angle modulated.

Since the first light ray 102 passing through the first region 201 and the second light ray 103 passing through the second region 202 have different directions, their microstructures need to be different to achieve different light ray angle modulations, so as to ensure that different light rays can respectively propagate along the expected paths.

By designing different microstructures in the first region 201 and the second region 202 of the diffusion film 200, the propagation directions of the first light ray 102 and the second light ray 103 can be precisely controlled.

Specifically, the first microstructure of the first region 201 ensures that the first light ray 102 propagates directly toward the reflector 302 after undergoing light ray angle modulation (angle modulation includes angle deflection and diffusion angle adjustment), while the second microstructure of the second region 202 enables the second light ray 103 to propagate toward the beam splitter 301 after undergoing light ray angle modulation (angle modulation includes angle deflection and diffusion angle adjustment). That is, after passing through two different microstructures, the first light ray 102 and the second light ray 103 can be split into two different paths for propagation.

By accurately controlling the propagation direction and angle of the light, the loss of the light in the propagation process can be reduced, and therefore the overall optical efficiency of the vehicle-mounted HUD system is improved.

In some examples of the present application, referring to fig. 1, the reflecting mirror 302 and the beam splitter 301 are disposed obliquely, and the beam splitter 301 is located on a reflecting path of the reflecting mirror 302, and the light projected onto the beam splitter 301 can be incident on the secondary optical module 400.

For the beam splitter module 300, by adjusting the angle and the distance between the beam splitter 301 and the reflecting mirror 302, the vehicle-mounted HUD system can flexibly control the propagation path of the light, so as to adjust the distance between the far and near virtual images. The flexibility enables the whole vehicle-mounted HUD system to adapt to different visual requirements and application scenes, and the display distance of the long-and-short-range virtual images can be adjusted according to the visual experience of a user or the system requirements.

In the example provided in the present application, the first region 201 and the second region 202 on the diffusion film 200 may be adjusted according to the near-far virtual image ratio of the system. This means that by varying the size, shape or microstructure characteristics of the two regions, the distribution and focusing of the light can be further carefully controlled, thereby optimizing the magnification ratio of the two virtual images.

The obliquely arranged reflector 302 and beam splitter 301 help to reduce losses and interference of light during propagation, and improve light utilization and overall optical performance of the system. Meanwhile, by precisely controlling the positions and angles of the elements, optical defects such as aberration, distortion and the like can be further reduced, and the definition and quality of images can be improved.

In some examples of the application, the beamsplitter 301 comprises a semi-reflective semi-transmissive beamsplitter, a polarizing beamsplitter, or a band filter.

The semi-reflective semi-transparent spectroscope is an optical element capable of reflecting and transmitting incident light rays according to a certain proportion. The surface of the spectroscope is plated with a special semi-reflective semi-transparent film, so that when light reaches the surface, one part is reflected and the other part is transmitted. The reflectivity and transmissivity of the spectroscope can be precisely controlled by adjusting the thickness and refractive index of the film so as to meet different optical requirements. In the vehicle-mounted HUD system provided by the embodiment of the present application, a half-reflecting and half-reflecting beam splitter may be used to transmit the light reflected by the reflecting mirror 302 to the secondary optical module 400.

A polarizing beamsplitter is an optical element that splits light based on the polarization state of the light. Which is capable of selectively reflecting or transmitting light depending on the polarization direction (e.g., horizontally polarized or vertically polarized) of the light. For example, the polarizing beamsplitter may be made of one or more polarization-sensitive optical materials, such as polarizers, polarizing prisms, and the like. In the HUD system provided in the embodiments of the present application, if a polarized light source is used or the polarization state of light needs to be controlled, the polarizing beam splitter may be used to achieve a specific optical effect, such as improving the contrast of an image or eliminating interference light.

A band filter is an optical element that allows light within a specific wavelength range to pass therethrough, 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, the center wavelength, the bandwidth and the like of the band filter can be designed and customized according to specific requirements. In the vehicle-mounted HUD system provided by the embodiment of the present application, if a specific color or wavelength of the light source needs to be screened, a band filter may be used to achieve this purpose.

The beam splitter 301 adopts a half-reflecting and half-transmitting beam splitter, a polarizing beam splitter or a wave band filter, and suitable optical elements can be selected according to specific requirements and application scenes of the vehicle-mounted HUD system so as to realize precise optical control and optimized imaging effects.

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

The PGU system 100 is an image source, also referred to as an image generator, of the overall vehicle HUD system. Among the three systems mentioned in the above examples, TFT technology is known for its substantivity and efficiency, which is capable of directly illuminating a pixel point through a built-in backlight system, and then seamlessly interfacing to a subsequent precision optical system, and generating a clear and vivid virtual image without an additional conversion step. This process not only simplifies the imaging path, but also ensures high fidelity of the image and accurate reproduction of the colors.

In contrast, LCOS systems employ more complex imaging mechanisms than DLP systems. These systems rely on passive illumination from an external light source to construct a fine image profile by precisely controlling the light transmission or reflection state of each pixel.

Among them, DLP technology adopts digital micromirror chips. DLP systems typically employ a reflective principle-light path system that is smaller, making the device more compact and portable. Today, with the addition of laser technology, the brightness of the picture of the DLP projector is greatly improved, and the color performance is more excellent.

The LCOS technology adopts a liquid crystal on silicon technology, and light is modulated by controlling the on-off state of a liquid crystal layer, so that projection of an image is realized. The technology has the advantages of high resolution and high light source utilization rate. LCOS systems typically employ a three-plate structure that processes light of three colors, red, green, and blue, respectively, and synthesizes color images through a precision optical system.

In some examples of the present application, referring to fig. 1, the PGU system 100 is configured as a single PGU module 101, where 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 a region, where 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.

The vehicle-mounted HUD system provided by the embodiment of the application realizes the seamless fusion of the near-far Jing Xuxiang in the visual space, and brings immersive visual experience to the user. The vehicle-mounted HUD system uses the principle of spatial overlapping dual virtual images, wherein the PGU module 101 is used as an image light source, and the emitted light is carefully distributed to different regions of the diffusion film 200, such that the first light 102 is focused on a first region 201 (upper half) of the diffusion film 200, and the second light 103 is projected on a second region 202 (lower half) of the diffusion film 200.

In order to achieve accurate construction of the near-far virtual image, the vehicle-mounted HUD system skillfully introduces an optical path difference mechanism, namely the beam splitter module 300 located between the diffusion film 200 and the secondary optical module 400, and particularly the beam splitter 301 therein becomes a key of the 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-view virtual image 702 (the second light 103 from the second area 202), but also reflects the first light from the first area 201 twice through cooperation with the reflecting mirror 302, so as to significantly prolong the optical path of the first light, thereby forming a far-view virtual image 701 in the human eye. The design enables the light rays of the first area 201 and the second area 202 which are originally positioned on the same plane to realize depth separation in visual perception, and creates a realistic far and near virtual image effect.

To further optimize the imaging quality, the microstructures of the first region 201 and the second region 202 on the diffusion film 200 are carefully designed to adapt to different light modulation requirements, ensuring that the light propagates precisely along a predetermined path. Meanwhile, in order to prevent the image interference caused by the light interlacing of the first area 201 and the second area 202, a shielding area 203 is especially arranged between the first area and the second area, so that the interference light is effectively isolated.

In addition, the angle and distance configuration between the beam splitter 301 and the reflecting mirror 302, and the division ratio between the first region 201 and the second region 202 may be flexibly adjusted according to the specific vehicle-mounted HUD system requirements, so as to precisely control the distance ratio and the display effect of the far and near virtual images, and ensure the definition and the realism of the images.

According to another embodiment of the present application, there is also provided a vehicle including a vehicle body including a windshield 500 and the vehicle-mounted HUD system as described above, the vehicle-mounted HUD system being provided to the vehicle body.

The specific implementation manner of the vehicle according to the embodiment of the present application may refer to each embodiment of the above-mentioned vehicle-mounted HUD system, so at least the beneficial effects brought by the technical solutions of the above embodiments are all provided, and will not be described in detail herein.

The foregoing embodiments mainly describe differences between the embodiments, and as long as there is no contradiction between different optimization features of the embodiments, the embodiments may be combined to form a better embodiment, and in consideration of brevity of line text, no further description is given here.

While certain specific embodiments of the application have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.

Claims

1. A vehicle-mounted HUD system, characterized by comprising 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), and is projected to the windshield (500) after being partially reflected by the beam splitter (301), and the windshield (500) reflects the first light ray (102) to the human eye (600), and at the same time, 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) can reflect 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 reflector 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 an occlusion 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 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).

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 a LCOS system.

9. The vehicle-mounted HUD system according to claim 2, characterized in that the PGU system (100) is configured as a single one, 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, comprising:

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.