CN115128812A

CN115128812A - AR-HUD and its long and short sight double optical path system

Info

Publication number: CN115128812A
Application number: CN202210798263.6A
Authority: CN
Inventors: 张宁波; 刘超; 吕涛; 周磊
Original assignee: Zejing Xi'an Automotive Electronics Co ltd
Current assignee: Zejing Xi'an Automotive Electronics Co ltd
Priority date: 2022-07-06
Filing date: 2022-07-06
Publication date: 2022-09-30
Anticipated expiration: 2042-07-06
Also published as: CN115128812B

Abstract

The embodiment of the application provides a far and near view double optical path system and AR-HUD of AR-HUD, includes: the single-projection double-image-surface module comprises a single-projection double-image-surface module, a close-range diffusion screen, a long-range diffusion screen, a first reflector, a second reflector, a third reflector and a windshield, wherein a first light beam projected by the single-projection double-image-surface module is reflected by the third reflector and then projected onto the close-range diffusion screen, and forms a close-range image source after being subjected to diffuse reflection by the close-range diffusion screen, and the close-range image source generates a close-range virtual image in front of the windshield after being reflected by the first reflector and the windshield; the second light beams projected by the single-projection double-image-plane module form a long-range image source after being subjected to diffuse reflection by the long-range diffusion screen; after the distant view image source is reflected by the second reflecting mirror, the first reflecting mirror and the windshield, a distant view virtual image is generated in front of the windshield; therefore, the double-display effect of the close-range virtual image and the distant-range virtual image is realized through one projection module, and the size of the AR-HUD can be effectively reduced.

Description

Far and near view double optical path system of AR-HUD and AR-HUD

Technical Field

The embodiment of the application relates to the technical field of vehicles, in particular to a far and near view double optical path system of an AR-HUD and the AR-HUD.

Background

A Head Up Display (HUD) is an auxiliary instrument that was earlier applied on an aircraft in order to cancel the pilot's operation of looking down at the instrument during the pilot's ride. At present, the head-up display function is widely applied to automobiles to reduce the operation of lowering the head of a driver to see instrument information, thereby improving the driving safety.

Currently, the mainstream HUDs on the market include windshield type HUDs (W-HUDs) and augmented reality type HUDs (AR-HUDs). As a far and near view HUD system, the AR-HUD can display basic state information of an automobile, can also perform live-view navigation by combining real road condition information, and has more visual and vivid navigation pictures, thereby greatly enriching the experience of man-machine interaction in the driving process.

In the existing AR-HUD long-and-short view double-optical-path system, most image sources are realized in a projection mode, and in order to ensure that the short-and-long view structure parts do not interfere, different projection modules are required to be respectively adopted for the short-and-long view optical path, so that the existing AR-HUD is large in size, and popularization of the AR-HUD is influenced.

Disclosure of Invention

The embodiment of the application provides a far and near view double optical path system and AR-HUD of AR-HUD to solve the problem that AR-HUD exists bulky among the prior art.

In a first aspect, an embodiment of the present application provides a far-and-near view dual optical path system of an AR-HUD, including: the system comprises a single-projection double-image-surface module, a close-range diffusion screen, a long-range diffusion screen, a first reflector, a second reflector, a third reflector and a windshield; the close-range diffusion screen and the long-range diffusion screen are both reflection-type diffusion screens;

the first light beam projected by the single-projection double-image-surface module is reflected by the third reflector, then projected on the close-range diffusion screen, and diffusely reflected by the close-range diffusion screen to form a close-range image source; after the close-range image source is reflected by the first reflector and the windshield, a close-range virtual image is generated in front of the windshield;

the second light beam projected by the single-projection double-image-plane module forms a distant view image source after being subjected to diffuse reflection by the distant view diffusion screen; after the distant view image source is reflected by the second reflecting mirror, the first reflecting mirror and the windshield, a distant view virtual image is generated in front of the windshield;

the first light beam carries near-view image information, the second light beam carries far-view image information, and the optical path of the second light beam is larger than that of the first light beam.

Optionally, the single-projection dual-image-plane module includes a light source, a display chip, and a projection lens;

the display chip comprises a close-range image display area and a distant-range image display area, the display chip displays the close-range image through the close-range image display area, and displays the distant-range image through the distant-range image display area, and the close-range image display area is positioned below the distant-range image display area;

the first light beam generated by the light source passes through the close-range image display area and the projection lens and then is projected onto the third reflector; and a second light beam generated by the light source passes through the distant view image display area and the projection lens and then is projected onto the distant view diffusion screen.

Optionally, the projection lens includes a prism and a lens group, and the prism is located between the display chip and the lens group;

the first light beam generated by the light source passes through the close-range image display area, the prism and the lens group and then is projected onto the third reflector; and a second light beam generated by the light source passes through the distant view image display area and the lens group and then is projected onto the distant view diffusion screen.

Optionally, the long-range view diffusion screen is located on a second image plane of the projection lens;

the third reflector is positioned on an emergent light path of the first light beam, the third reflector is close to the upper edge of the distant view diffusion screen, and the close view diffusion screen is positioned above the third reflector; the sum of the distance from the single-projection double-image-plane module to the third reflector and the distance from the third reflector to the close-range diffusion screen is equal to the distance from the single-projection double-image-plane module to the first image plane of the projection lens;

the first image plane is an imaging plane of the prism and the lens group, the second image plane is an imaging plane of the lens group, and the distance from the first image plane to the single-projection double-image-plane module is greater than the distance from the second image plane to the single-projection double-image-plane module.

Optionally, the second reflector is located above the distant view diffuser, the near view diffuser and the second reflector are located in the same spatial plane, and the near view diffuser is close to the upper edge of the second reflector; and an included angle between the space plane where the long-range view diffusion screen is located and the space plane where the third reflector is located is a first angle.

Optionally, the prism is a cylindrical prism, and the near view diffusing screen is parallel to the far view diffusing screen.

Optionally, the prism is a wedge-shaped prism, and an included angle between the close-range diffusion screen and the long-range diffusion screen is a second angle.

Optionally, the first mirror comprises a first near view reflection zone and a first far view reflection zone, the first near view reflection zone being located above the first far view reflection zone;

the windshield comprises a second near view reflection area and a second far view reflection area, and the second near view reflection area is positioned below the second far view reflection area;

the close-range image source is reflected by the first close-range reflection area and the second close-range reflection area, and then a close-range virtual image is generated in front of the windshield;

the long-range view image source is through the second mirror the first long-range view reflecting area with after the second long-range view reflecting area reflection, windshield the place ahead produces the long-range view virtual image.

Optionally, the second mirror is a plane mirror or a curved mirror.

Optionally, the first reflector is a plane reflector or a curved reflector.

Optionally, the third mirror is a plane mirror.

In a second aspect, an embodiment of the present application provides an AR-HUD, including: the system comprises a single-projection double-image-surface module, a close-range diffusion screen, a long-range diffusion screen, a first reflector, a second reflector and a third reflector;

the first light beam projected by the single-projection double-image-surface module is reflected by the third reflector, then projected on the close-range diffusion screen, and diffusely reflected by the close-range diffusion screen to form a close-range image source; after the close-range image source is reflected by the first reflector and a windshield in front of the vehicle, a close-range virtual image is generated in front of the windshield;

the second light beams projected by the single-projection double-image-plane module form a long-range image source after being subjected to diffuse reflection by the long-range diffusion screen; after the distant view image source is reflected by the second reflecting mirror, the first reflecting mirror and the windshield, a distant view virtual image is generated in front of the windshield;

The utility model provides a far and near view double optical path system and AR-HUD of AR-HUD, include: the system comprises a single-projection double-image-plane module, a close-range diffusion screen, a long-range diffusion screen, a first reflector, a second reflector, a third reflector and a windshield, wherein a first light beam projected by the single-projection double-image-plane module is reflected by the third reflector and then projected onto the close-range diffusion screen, and is subjected to diffuse reflection by the close-range diffusion screen to form a close-range image source; the second light beam projected by the single-projection double-image-plane module forms a distant view image source after being diffused and reflected by a distant view diffusion screen; after the distant view image source is reflected by the second reflecting mirror, the first reflecting mirror and the windshield, a distant view virtual image is generated in front of the windshield; therefore, the double-display effect of the close-range virtual image and the distant-range virtual image is realized through one projection module, the volume of the AR-HUD is reduced longitudinally, and the cost of the AR-HUD is saved.

It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of a conventional AR-HUD with a long-and-short-range dual optical path system;

FIG. 2 is a schematic diagram of a far-and-near view dual optical path system of an AR-HUD according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a single-projection dual-image-plane module according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a projection lens according to an embodiment of the present disclosure;

fig. 5 is a schematic optical path diagram of a single-projection dual-image-plane module according to an embodiment of the present application.

Description of reference numerals:

10-AR-HUD；

11-a distant view projection module;

12-a close-up projection module;

13-mirror one;

14-mirror two;

15-mirror three;

20-a windshield;

30-close-range virtual image;

40-perspective virtual image;

210-single projection double image surface module;

211-a light source;

212-a display chip;

2121-close-up image display area;

2122-distant view image display area;

213-projection lens;

220-close-range diffusion screen;

230-perspective diffusing screen;

240-a first mirror;

250-a second mirror;

260-third mirror.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

First, the terms referred to in the application examples are explained as follows:

optical path: the product of the path traveled by light in a medium and the refractive index of the medium. For example, in a medium with a refractive index n, if the distance traveled by light is r, the optical path length is the product nr.

Image surface: the image plane is a short term for the image focal plane, and in the optical design, the image plane refers to a plane on which an object can be clearly imaged through the lens.

Diffuse reflection: is a phenomenon of reflecting light in various directions.

Far and near view dual optical path system: the system is characterized in that one optical path displays a close-range image (namely, a close-range optical path) and the other optical path displays a far-range image (namely, a far-range optical path) through optical design. The close-range light path is mainly used for displaying images of information on a traditional vehicle instrument panel, such as vehicle speed, parking marks, gears and the like, namely close-range images, and the far-range light path is mainly used for displaying information related to navigation, such as images of maps, vehicle distances, yaw information and the like, namely far-range images.

Close-range virtual image: the image of the close-range image formed by the close-range light path is closer to the human eye.

Distant view virtual image: the long-range image is far away from human eyes through the image formed by the long-range light path.

Based on the considerations of practicality, safety, AR effect and the like, the far and near view double optical path system of the AR-HUD not only ensures that the near view virtual image is positioned below the windshield glass and the far view virtual image is positioned above the windshield glass, but also ensures that the near view virtual image is close to the human eye as much as possible, and the far view virtual image is far away from the human eye as much as possible, so that the far and near view double optical path optical system of the AR-HUD has the following requirements: (1) the object planes in the two optical paths are ensured not to be overlapped, and the image planes are also ensured not to be overlapped; (2) the close-up virtual image and the long-range image are clear at the same time.

To meet the above requirement, fig. 1 is a schematic structural diagram of a far and near view dual optical path system of a conventional AR-HUD, as shown in fig. 1, the far and near view dual optical path system of the conventional AR-HUD includes: the device comprises a distant view projection module 11, a close view projection module 12, a first reflector 13, a second reflector 14, a third reflector 15 and a windshield 20, wherein the distant view projection module 11, the close view projection module 12, the first reflector 13, the second reflector 14 and the third reflector 15 are positioned in the AR-HUD 10. The AR-HUD 10 is disposed below the dashboard below the windshield 20, and the outgoing light beam of the AR-HUD 10 is reflected by the windshield 20 into the eye box area, forming a near view virtual image 30 and a far view virtual image 40 in front.

The long-range view projection module 11, the first reflector 13 and the second reflector 14 form a long-range view image optical system, light of a long-range view image source generated by the long-range view projection module 11 is reflected by the first reflector 13 and the second reflector 14 in sequence and reflected by the windshield 20 to enter the eye box area and form a long-range view virtual image 40 in the front, the long-range view virtual image is an augmented reality image, and the main light path for generating the long-range view virtual image is 101. The close-range projection module 12 and the third reflector 15 form a close-range image optical system. The light of the close-range image source generated by the close-range projection module 12 is reflected by the third reflector 15 and is reflected by the windshield 20, enters the eye box area and forms a close-range virtual image 30 in front, the close-range virtual image is a vehicle state image, and the path of the main light ray for generating the close-range virtual image is 102. However, since the two projection modules, i.e. the close-range projection module and the distant-range projection module, are required to be respectively disposed at different spatial positions in the prior art, not only the cost of the AR-HUD is high, but also the volume of the AR-HUD is large, thereby not being beneficial to the popularization and wide application of the AR-HUD.

Based on the technical problem that exists among the prior art, this application embodiment provides a long-shot and short-shot double optical path system of AR-HUD, on the basis of reforming transform to projection module's structure, through adopting reflective diffusion screen as long-shot screen and short-shot screen to through the position of speculum and long-shot screen, short-shot screen in the reasonable overall arrangement light path, thereby realized the long-shot and short-shot double optical path of AR-HUD through a projection module and showed, not only vertically reduced the volume of AR-HUD, still reduced AR-HUD's cost.

Fig. 2 is a schematic structural diagram of a far-and-near view dual optical path system of an AR-HUD according to an embodiment of the present disclosure, and as shown in fig. 2, the far-and-near view dual optical path system of an AR-HUD according to the present embodiment includes: the system comprises a single projection double-image-plane module 210, a close-range diffusion screen 220, a far-range diffusion screen 230, a first reflector 240, a second reflector 250, a third reflector 260 and a windshield 20. Wherein the single-projection double-image-plane module 210, the close-view diffusion screen 220, the far-view diffusion screen 230, the first mirror 240, the second mirror 250 and the third mirror 260 are located in the AR-HUD 10.

In this embodiment, a close-range image source and a far-range image source are realized by the single-projection double-image-plane module 210, the close-range diffusion screen 220 and the far-range diffusion screen 230 in a form of "projection + diffusion screen", specifically, the close-range image source is generated by the single-projection double-image-plane module 210 and the close-range diffusion screen 220, and the far-range image source is generated by the single-projection double-image-plane module 210 and the far-range diffusion screen 230.

Different from the prior art, the near view screen and the far view screen in this embodiment both use a diffusion screen having a diffusion effect on light, so as to achieve the purpose of increasing the light beam divergence angles of the near view image source and the far view image source, thereby ensuring that a driver can see the images (i.e., the near view virtual image 30 and the far view virtual image 40) formed by the near view image and the far view image in front of the windshield 20 from various angles of the eye box.

In the embodiment of the present application, the near view diffusing screen 220 and the far view diffusing screen 230 both adopt reflective diffusing screens for performing diffuse reflection on received light.

In this embodiment, the projection module is modified to obtain a single-projection dual-image-plane module. Exemplarily, fig. 3 is a schematic structural diagram of a single-projection dual-image plane module according to an embodiment of the present disclosure, and as shown in fig. 3, the single-projection dual-image plane module 210 according to the present embodiment includes: a light source 211, a display chip 212, and a projection lens 213.

The light source 211 is composed of a single-color light source of three colors of red, green, and blue, and may be a laser, a Light Emitting Diode (LED), or the like, which is not limited herein.

The display chip 212 includes a near view image display area 2121 and a far view image display area 2122, and according to the actual vehicle condition and the display requirement, the display chip 212 displays the near view image through the near view image display area 2121 and displays the far view image through the far view image display area 2122.

In a possible embodiment, when an image needs to be displayed by the AR-HUD, the display chip 212 determines whether the image to be displayed is a close-range image or a long-range image by identifying the type of the image to be displayed, and further displays the image to be displayed by using the close-range image display area 2121 or the long-range image display area 2122 according to the type of the image to be displayed, that is, switches the image in the close-range image display area 2121 or the long-range image display area 2122 to the image to be displayed. For example, if the image to be displayed is a close-range image, the image in the close-range image display area is switched to the image to be displayed, so as to ensure that the original image in the distant-range image display area is unchanged.

In one possible embodiment, as shown in fig. 3, the near view image display area 2121 of the display chip 212 is located below the far view image display area 2122, i.e. the upper portion of the display chip 212 is used for displaying the far view image, and the lower portion of the display chip 212 is used for displaying the near view image.

When passing through the display chip 212, the light beam generated by the light source 211 will carry the information of the near view image and the far view image displayed on the display chip 212 to continue to propagate forward, and after being converted by the projection lens 213, the information of the near view image and the far view image is input into different optical paths of the dual optical path system shown in fig. 2, so that the driver can see the dual display effect of separately displaying the far view virtual image and the near view virtual image.

For convenience of understanding, in the present embodiment, the light beam generated by the light source 211 projected onto the close-up image display region 2121 is called a first light beam; the light beam projected onto the distant view image display area 2122 by the light source 211 is called a second light beam. As shown in fig. 3, in this embodiment, the first light beam passes through the near view image display area 2121 and the projection lens 213, then is projected onto the third reflector 260 and reflected onto the near view diffusing screen 220, and is diffused and reflected by the near view diffusing screen 220 to generate a near view image source, and the second light beam passes through the far view image display area 2122 and the projection lens 213, then is projected onto the far view diffusing screen 230, and is diffused and reflected by the far view diffusing screen 230 to generate a far view image source.

For realizing the staggered display effect of the close-range image and the long-range image, namely, the human eyes are closer to the close-range virtual image in front of the windshield 20, and the long-range virtual image is further, the projection lens is required to be modified so as to ensure that the close-range image and the long-range image coming out of the single-projection double-image-plane module 210 can be staggered by a distance at the position where the images are clear. In one possible embodiment, when designing the projection lens 213, the projection lens 213 has two image planes by adding a prism in the optical path of the first light beam to increase the optical path of the first light beam.

Exemplarily, fig. 4 is a schematic structural diagram of a projection lens provided in an embodiment of the present application, and as shown in fig. 4, the projection lens 213 includes a prism 2131 and a lens group 2132, and the prism 2131 is located between the light source 211 and the lens group 2132.

The prism 2131 may be a cylindrical prism or a wedge prism, and may be specifically designed according to the spatial positions of the close-range diffusion screen and the far-range diffusion screen. For example, if the near view diffusion screen is parallel to the far view diffusion screen, the prism 2131 may be a cylindrical prism; if there is a certain angle between the near view diffusion screen and the far view diffusion screen in space, and the angle is assumed to be a second angle, the prism 2131 needs to adopt a wedge-shaped prism with a certain wedge angle to compensate for the change of the image plane of the single-projection dual-image-plane module 210 caused by the angle between the near view diffusion screen and the far view diffusion screen with the second angle.

A lens group 2132, which is an optical module composed of a series of lenses, prisms, etc., for example, fig. 5 is a schematic optical path diagram of a single-projection dual-image-plane module provided in this embodiment of the present application, as shown in fig. 5, a close-up image on a display chip passes through a prism and a lens group, and then a clear real image is obtained on a first image plane; after the long-range image on the display chip passes through the lens group, a clear real image is obtained on the second image plane, and because the first light beam has one more prism than the light path of the second light beam, namely, in the process of generating an image source (in the process of transmitting light from the light source to the diffusion screen), the optical path of the first light beam is greater than that of the second light beam, so that the distance from the first image plane to the display chip is greater than that from the second image plane to the display chip.

Based on the single-projection dual image plane module 210, in this embodiment, in order to ensure the definition of the image, as shown in fig. 3, a third reflector 260 is disposed on an exit optical path of the first light beam emitted by the single-projection dual image plane module 210, meanwhile, the third reflector 260 is disposed near an upper edge of the long-view diffusion screen 230, the short-view diffusion screen 220 is disposed above the third reflector 260, and a sum of a distance from the single-projection dual image plane module 210 to the third reflector 260 and a distance from the third reflector 260 to the short-view diffusion screen 220 is equal to a distance from the single-projection dual image plane module 210 to the first image plane. Exemplarily, assuming that the optical path length of the first light beam propagating from 213 to 260 in fig. 3 is d1, the optical path length of the first light beam propagating from 260 to 220 is d2, and assuming that the optical path length of the first light beam directly propagating from the projection lens in fig. 5 to the first image plane is d, it is required to ensure that the value of d1+ d2 is equal to d. That is, the third reflector 260 changes the direction of the first light beam and keeps the optical path of the first light beam from the projection lens 213 to the near-field diffusion screen 220 unchanged, so as to ensure that a clear real image is formed on the near-field diffusion screen 220 after the near-field image on the display chip passes through the third reflector 260, thereby obtaining a clear near-field image source.

In this embodiment, the third reflector 260 is a plane reflector, and the third reflector 260 is configured to change a direction of the first light beam emitted by the single-projection double-image-plane module 210, so that the first light beam emitted by the single-projection double-image-plane module 210 is reflected by the third reflector 260, then projected onto the close-range diffusion screen 220, and diffusely reflected by the close-range diffusion screen 220 to form a close-range image source.

The long-range view diffuser 230 is disposed on the second image plane of the projection lens 213, so that the second light beam emitted from the single-projection dual-image plane module 210 is projected onto the long-range view diffuser 230, thereby forming a long-range view image source.

Wherein the first image plane is an image plane of a projection lens portion (a lower portion of the projection lens) including a prism and a lens group, the second image plane is an image plane of a projection lens portion (an upper portion of the projection lens) including only the lens group, and a distance from the first image plane to the single-projection dual image plane module 210 is greater than a distance from the second image plane to the single-projection dual image plane module 210.

Further, in this embodiment, as shown in fig. 2, the second reflecting mirror 250 is disposed above the distant view diffusion screen 230, the second reflecting mirror 250 and the near view diffusion screen 220 are disposed in the same spatial plane, the near view diffusion screen 220 is close to the upper edge of the second reflecting mirror 250, and an included angle between the spatial plane of the distant view diffusion screen 230 and the spatial plane of the third reflecting mirror 260 is a first angle, so that it is ensured that the first light beam emitted by the single-projection double-image plane module 210 can be projected onto the third reflecting mirror 260 without being blocked, and the second light beam emitted by the single-projection double-image plane module 210 can be projected onto the distant view diffusion screen 230 without being blocked.

The first angle may be 0, that is, the perspective diffusion screen 230 and the third reflector 260 are spatially parallel, or may not be 0, that is, a slight angle exists between the perspective diffusion screen 230 and the third reflector 260 in space. It should be noted that, when the first angle is not 0, the distance from the close-range diffusion screen 220 to the upper edge of the second reflecting mirror 250 may be adjusted to compensate, so as to ensure that the first light beam is reflected by the third reflecting mirror 260 and then projected onto the close-range diffusion screen 220.

In this embodiment, as shown in fig. 2, after the first light beam is reflected by the third reflector 260 and reaches the near view diffusion screen 220, and after the first light beam is diffusely reflected by the near view diffusion screen 220, a near view image source (formed by light emitted from the near view diffusion screen) is generated, the near view image source reaches the windshield 20 after being reflected by the first reflector 240, and then is reflected by the windshield 20 to enter human eyes, so that the human eyes can see a near view virtual image formed in front of the windshield 20; after the second light beam is projected onto the distant view diffusion screen 230 and diffusely reflected by the distant view diffusion screen 230, a distant view image source (composed of light emitted from the distant view diffusion screen) is generated, the distant view image source reaches the first reflecting mirror 240 after being reflected by the second reflecting mirror 250, then reaches the windshield 20 after being reflected by the first reflecting mirror 240, and finally enters the human eye after being reflected by the windshield 20, and the human eye can see a distant view virtual image formed in front of the windshield 20.

In this embodiment, the second reflecting mirror 250 is only used for reflecting the perspective image source, and the second reflecting mirror 250 may be a flat mirror or a curved mirror, which is not limited herein.

In this embodiment, the first reflecting mirror 240 and the windshield 20 are used for reflecting both the near view image source and the distant view image source, so that the size of the first reflecting mirror 240 is designed to be larger during the optical design, thereby ensuring that the near view image source and the distant view image source do not overlap on the first reflecting mirror 240. The windshield 20 may be an existing windshield of a vehicle.

In this embodiment, the first reflecting mirror 240 may be a flat mirror or a curved mirror, which is not limited herein.

In one possible embodiment, the first mirror 240 is configured to include a first near view reflection region and a first far view reflection region, and the first near view reflection region is configured to be located above the first far view reflection region, i.e., to reflect the near view image source through an upper portion of the first mirror 240 and to reflect the far view image source through a lower portion of the first mirror 240. The windshield 20 is arranged to include a second near view reflection area and a second far view reflection area, and the second near view reflection area is arranged below the second far view reflection area, that is, the far view image source is reflected by an upper portion of the windshield 20, and the near view image source is reflected by a lower portion of the windshield 20. Therefore, after the close-range image source is reflected by the first close-range reflection area and the second close-range reflection area, a close-range virtual image is generated at a position close to the lower front of the windshield, and after the distant-range image source is reflected by the second reflection mirror, the first distant-range reflection area and the second distant-range reflection area, a distant-range virtual image is generated at a position close to the upper front of the windshield, so that the partitioned display of the close-range virtual image and the distant-range virtual image is realized.

The present embodiment provides a far and near view dual optical path system of an AR-HUD, including: the single-projection double-image-surface module comprises a single-projection double-image-surface module, a close-range diffusion screen, a long-range diffusion screen, a first reflector, a second reflector, a third reflector and a windshield, wherein a first light beam projected by the single-projection double-image-surface module is reflected by the third reflector and then projected onto the close-range diffusion screen, and forms a close-range image source after being subjected to diffuse reflection by the close-range diffusion screen, and the close-range image source generates a close-range virtual image in front of the windshield after being reflected by the first reflector and the windshield; the second light beam projected by the single-projection double-image-plane module forms a distant view image source after being diffused and reflected by a distant view diffusion screen; after the distant view image source is reflected by the second reflecting mirror, the first reflecting mirror and the windshield, a distant view virtual image is generated in front of the windshield; therefore, the double-display effect of the close-range virtual image and the far-range virtual image is realized through one projection module, the size of the AR-HUD is reduced longitudinally, and the cost of the AR-HUD is saved.

The embodiment of the present application further provides an AR-HUD, as shown in fig. 2, the AR-HUD provided in this embodiment includes: a single projection double image plane module 210, a close view diffusion screen 220, a far view diffusion screen 230, a first mirror 240, a second mirror 250 and a third mirror 260.

The first light beam projected by the single-projection double-image-plane module 210 is reflected by the third reflector 260, projected on the close-range diffusion screen 220, and diffusely reflected by the close-range diffusion screen 220 to form a close-range image source; after the close-range image source is reflected by the first reflector 240 and the windshield in front of the vehicle, a close-range virtual image is generated in front of the windshield;

the second light beam projected by the single-projection double-image-plane module 210 forms a distant view image source after being diffused and reflected by the distant view diffusion screen 230; after the distant view image source is reflected by the second reflecting mirror 250, the first reflecting mirror 240 and the windshield in front of the vehicle, a distant view virtual image is generated in front of the windshield;

It should be noted that, in the above embodiment of the far-and-near view dual optical path system of the AR-HUD, the included units and modules are only divided according to the functional logic, but are not limited to the above division, as long as the corresponding functions can be implemented; in addition, specific names of the functional units are only used for distinguishing one functional unit from another, and are not used for limiting the protection scope of the application.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present application and the technical principles employed. It will be understood by those skilled in the art that the present application is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the application. Therefore, although the present application has been described in more detail with reference to the above embodiments, the present application is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. An AR-HUD dual beam path system for long and short views, comprising: the system comprises a single-projection double-image-surface module, a close-range diffusion screen, a long-range diffusion screen, a first reflector, a second reflector, a third reflector and a windshield; the close-range diffusion screen and the distant-range diffusion screen are both reflection-type diffusion screens;

2. The system of claim 1, wherein the single projection dual image plane module comprises a light source, a display chip and a projection lens;

3. The system of claim 2, wherein the projection lens comprises a prism and a lens group, the prism is located between the display chip and the lens group;

4. The system of claim 3, wherein the long-range diffusion screen is located at a second image plane of the projection lens;

5. The system of claim 4, wherein said second mirror is positioned above said distance view diffuser screen, said near view diffuser screen being positioned in the same spatial plane as said second mirror, said near view diffuser screen being positioned proximate to an upper edge of said second mirror; an included angle between a space plane where the long-range view diffusion screen is located and a space plane where the third reflector is located is a first angle.

6. The system of claim 4, wherein the prism is a cylindrical prism and the near field diffuser screen is parallel to the far field diffuser screen.

7. The system of claim 4, wherein the prism is a wedge prism, and the angle between the near view diffuser and the far view diffuser is a second angle.

8. The system of any of claims 1-7, wherein the first mirror comprises a first near view reflection zone and a first far view reflection zone, the first near view reflection zone being located above the first far view reflection zone;

after the close-range image source is reflected by the first close-range reflection region and the second close-range reflection region, a close-range virtual image is generated in front of the windshield;

9. The system of any of claims 1-7, wherein the second mirror is a flat mirror or a curved mirror.

10. The system of any of claims 1-7, wherein the first mirror is a flat mirror or a curved mirror.

11. The system of any of claims 1-7, wherein the third mirror is a flat mirror.

12. An AR-HUD, comprising: the system comprises a single-projection double-image-surface module, a close-range diffusion screen, a long-range diffusion screen, a first reflector, a second reflector and a third reflector;