CN114185171A

CN114185171A - Head-up display device with variable imaging distance and head-up display system

Info

Publication number: CN114185171A
Application number: CN202010961658.4A
Authority: CN
Inventors: 方涛; 徐俊峰; 吴慧军
Original assignee: Futurus Technology Co Ltd
Current assignee: Futurus Technology Co Ltd
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2022-03-15

Abstract

The application discloses a head-up display device with a variable imaging distance and a head-up display system, wherein the head-up display device comprises a projection part, an imaging part, a reflecting element and an adjusting device, the projection part comprises a light source, an image generating part and a lens part and emits projection light, and the projection light is gathered at a first position; the imaging part is arranged at a first position, receives the projection light to form a real image and emits imaging light; the reflecting element reflects the imaging light rays incident to the reflecting element to an external imaging device, and the imaging light rays are reflected by the external imaging device to form a virtual image; the adjusting device changes the position of the real image to adjust the distance between the imaging position of the virtual image and the external imaging device. The head-up display device provided by the embodiment of the application can adjust the imaging position of a virtual image formed by the head-up display device, and realizes imaging at different imaging distances.

Description

Head-up display device with variable imaging distance and head-up display system

Technical Field

The application belongs to the technical field of optical display, and particularly relates to a head-up display device with a variable imaging distance and a head-up display system.

Background

Vehicles and other various vehicles become an indispensable part of modern social life, but the driving safety problem also becomes a significant problem threatening the life safety of people. Generally, during driving, a driver can pay close attention to relevant driving information on a dashboard of a vehicle to ensure reliable driving, however, due to the limited volume of the vehicle, the dashboard is designed below a console, so that the driver needs to look at the relevant information on the dashboard through head lowering during driving, and in actual driving, the action frequency of looking at the information on the dashboard through head lowering is very high, and the driver is likely to be distracted during head lowering, thereby causing traffic accidents.

The HUD (head up display) technology projects important driving information in front of the sight of a driver through the reflection imaging principle and the reflection imaging of a windshield or a special transparent imaging window, the driver does not need to look over an instrument and the like by lowering the head, the distraction caused by the driver looking at an instrument panel by lowering the head in the driving process can be avoided, and the driving safety can be ensured.

When a driver drives a vehicle, the distances between the actual road conditions observed by the driver, such as vehicles, pedestrians, road markers and the like in front of the vehicle, and the distances are constantly changed along with the movement of the vehicle; however, the imaging distance of the image formed by the conventional HUD is generally not adjustable, so that the imaging position of the image is often inconsistent with the focusing position of the eyes of the driver, for example, when the driver gazes at a distant road, the image formed by the HUD needs to be observed from the distant road to the near road, which causes a visual convergence conflict, and causes the driver to have bad conditions such as fatigue and nausea.

Disclosure of Invention

In order to overcome the above problems, the present application provides a head-up display device and a head-up display system with a variable imaging distance.

At least one embodiment of the present application provides a head-up display device with a variable imaging distance, including: a projection section configured to emit a projection light, the projection section including: a light source configured to emit light rays, an image generating section configured to convert the light rays emitted from the light source into image light rays, and a lens section configured to convert the image light rays into projection light rays, the projection light rays being condensed at a first position; an imaging part configured to receive the projected light to form a real image, the imaging part being disposed at a first position, the imaging light formed by the real image being emitted through the imaging part; a reflection element configured to reflect the imaging light rays incident thereto to an external imaging device, the imaging light rays reflected by the reflection element being reflected by the external imaging device and forming a virtual image; and an adjustment device configured to change a position of the real image to adjust a distance between the virtual image imaging position and the external imaging device.

For example, in an embodiment of the present application, the adjustment device is configured to: changing the optical power of the lens portion to change the first position; and changing a distance between the imaging portion and the reflective element so that the imaging portion coincides with the changed first position.

For example, in an embodiment of the present application, the adjusting means comprises: the acquisition module is used for acquiring at least one of current user visual information and current vehicle driving information; the processing module receives the information acquired by the acquisition module, processes the information and converts the information into an adjustment instruction; an adjustment module that receives and executes the adjustment instruction, adjusts an optical power of the lens portion, and a distance between the imaging portion and the reflection element to adjust a distance between the virtual image imaging position and the external imaging device.

For example, in an embodiment of the present application, the user visual information includes: at least one of gaze time, gaze direction, or gaze convergence position.

For example, in an embodiment of the present application, the vehicle driving information includes: at least one of vehicle speed information and distance information.

For example, in embodiments of the present application, the reflective element comprises at least one curved mirror.

For example, in the embodiments of the present application, the distance between the imaging portion and the reflective element is smaller than or equal to the focal length of the reflective element.

At least one embodiment of the present application further provides a head-up display system with a variable imaging distance, which includes any one of the above-mentioned head-up display devices; and an external imaging device; wherein the external imaging device is configured to reflect the imaging light rays and form a virtual image on a side of the external imaging device away from the heads-up display device.

For example, in the embodiment of the present application, the projection unit includes a first projection unit and a second projection unit, which respectively emit a first projection light and a second projection light; the first projection light is emitted to the imaging part and forms a first real image, the second projection light is emitted to the imaging part and forms a second real image, and the first real image and the second real image are configured to have different display contents.

For example, in the embodiment of the present application, the method further includes: an auxiliary imaging device; the auxiliary imaging device is configured to have a first viewing portion and a second viewing portion; the first viewing part is configured to pass first imaging light rays emitted by the first real image and block second imaging light rays emitted by the second real image; the second viewing portion is configured to pass second imaging light rays emitted by the second real image and block first imaging light rays emitted by the first real image.

For example, in an embodiment of the present application, the first projection light includes light of a first polarization state, and the second projection light includes light of a second polarization state; and the first polarization state is perpendicular to the second polarization state.

For example, in an embodiment of the present application, the first projected light includes light of a first specific wavelength band, and the second projected light includes light of a second specific wavelength band; the first specific wavelength band of light includes at least one of a first red wavelength band, a first green wavelength band and a first blue wavelength band; the second specific wave band of light comprises at least one wave band of a second red wave band, a second green wave band and a second blue wave band; and the first specific wavelength band is not coincident with the second specific wavelength band.

For example, in the embodiment of the present application, the method further includes: the phase delay element is attached to one side, far away from the virtual image, of the external imaging device; the imaging light includes light of a first linear polarization state, and the phase retarding element is configured to convert the light of the first linear polarization state into at least one of light of a second linear polarization state, light of a circular polarization state, or light of an elliptical polarization state.

For example, in the embodiment of the present application, the method further includes: the selective transflective film is attached to one side, away from the virtual image, of the external imaging device; the selective reflection film is configured to have a first reflectivity for light in a wavelength band in which the imaging light is located and a second reflectivity for light in a wavelength band other than the imaging light; and the first reflectivity is greater than the second reflectivity.

In the above-mentioned scheme that this application embodiment provided, through adjusting the formation of image position of the real image that heads up display device projection portion becomes, change the formation of image distance of the image that heads up display device becomes, heads up display device can form images in different distance departments, the formation of image of different distances can be with current user like the position matching of driver's sight focus, avoid the realization of driver to switch back and forth between the image of fixed distance and the real scene of different distances, avoid the driver to produce discomfort, and then promoted heads up display device's use experience and driving safety.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

FIG. 1 is a schematic diagram illustrating a first exemplary embodiment of a head-up display device with a variable imaging distance;

FIG. 2a is a schematic diagram showing a first structural diagram of a projection part and an imaging part in a head-up display device with a variable imaging distance according to an embodiment of the present disclosure;

FIG. 2b is a schematic diagram of a second exemplary embodiment of a projection unit and an imaging unit of a head-up display device with a variable imaging distance;

FIG. 3a is a schematic diagram illustrating a real imaging and imaging portion of a variable imaging distance heads up display device in accordance with an embodiment of the present application;

FIG. 3b is a schematic diagram of a real imaging and imaging portion of a variable imaging distance heads up display device in accordance with an embodiment of the present application;

FIG. 4 is a schematic diagram of a second exemplary embodiment of a head-up display device with a variable imaging distance;

FIG. 5 is a first schematic diagram illustrating a first exemplary embodiment of a variable imaging distance heads-up display system;

FIG. 6 is a schematic diagram illustrating a first exemplary configuration of an adjustment mechanism in a variable-imaging-distance heads-up display apparatus according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram illustrating a process performed by an adjustment device in a variable-imaging-distance heads-up display device according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram showing a third exemplary embodiment of a head-up display device with a variable imaging distance;

FIG. 9 is a third schematic diagram of a real image and an imaging portion of a variable imaging distance heads up display device in accordance with an embodiment of the present application;

fig. 10 is a schematic diagram of a second embodiment of a head-up display system with a variable imaging distance.

Description of reference numerals: 10-a projection section; 11-a light source; 12-an image generating section; 13-a lens portion; 14-a reflective portion; 20-an imaging section; 30-a reflective element; 31-curved mirror; 32-plane mirror; 40-a regulating device; 41-an acquisition module; 42-a processing module; 43-a regulation module; 50-a package housing; 51-a light outlet; 52-dustproof film; 53-antiglare masks; 200-an external imaging device; 300-an auxiliary imaging device; 301-a first viewing section; 302-second viewing section.

Detailed Description

The embodiments of the present application will be further described with reference to the accompanying drawings.

The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. The present application is capable of other and different embodiments and its several details are capable of modifications and/or changes in various respects, all without departing from the spirit of the present application. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present application, and the drawings only show the components related to the present application and are not drawn according to the number, shape and size of the components in actual implementation, and the type, number and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.

It should be noted that for simplicity and clarity of description, the following describes exemplary embodiments of the present application. Numerous details of the embodiments are set forth merely to aid in understanding the aspects of the present application. It will be apparent, however, that the present technology is not limited to these details. Some embodiments are not described in detail, but rather are merely provided as frameworks, in order to avoid unnecessarily obscuring aspects of the present application. Hereinafter, "including" means "including but not limited to", "according to … …" means "at least according to … …, but not limited to … … only". "first," "second," and the like are used merely as references to features and are not intended to limit the features in any way, such as in any order. In view of the language convention of chinese, the following description, when it does not specifically state the number of a component, means that the component may be one or more, or may be understood as at least one.

An embodiment of the present application provides a head-up display device with a variable imaging distance, as shown in fig. 1 and 2, including: a projection unit 10 configured to emit projection light, the projection unit including: a light source 11 configured to emit light rays, an image generating section 12 configured to convert the light rays emitted by the light source 11 into image light rays, and a lens section 13 configured to convert the image light rays into projection light rays, the projection light rays being condensed at a first position P1; an imaging section 20 configured to receive the projected light to form a real image, the imaging section 20 being disposed at a first position P1, the imaging light formed by the real image being emitted through the imaging section 20; a reflection element 30 configured to reflect the imaging light rays incident thereto to an external imaging device, the imaging light rays reflected by the reflection element 30 being reflected by the external imaging device and forming a virtual image; and an adjustment device 40 configured to change the position of the real image to adjust the distance between the virtual image and the external imaging device.

In this embodiment, the projection portion 10 includes a light source 11, and the light source 11 emits light; in fig. 2a and 2b, the light emitted from the light source 11 is illustrated by a light ray a. The light source 11 may be a point light source, a line light source or a surface light source, and the number of the light sources 11 may be one or more, which is not limited; specifically, the Light source 11 includes one or more Light Emitting elements, including but not limited to a Light Emitting Diode (LED), an Organic Light Emitting Diode (OLED), a Mini LED (Mini LED), a Micro LED (Micro LED), a Cold Cathode Fluorescent Lamp (CCFL), a Cold Light source (Cold LED Light, CLL), an Electroluminescence (EL), an electron Emission (FED), a Quantum Dot Light source (Quantum Dot), or the like.

In this embodiment, the projection unit 10 further includes an image generating unit 12, the image generating unit 12 converts the light emitted from the light source 11 into image light, the image light is specifically light containing image information, and can display an image directly or after reflection, refraction, and the like, and the image light is illustrated as a light B in fig. 2a and 2B. The image generating part 12 may be a liquid crystal display layer, the light ray a is transmitted or reflected by the liquid crystal display layer to display an image, and the liquid crystal display layer emits an image light ray B including image information; or at least one of a Digital Micromirror Device (DMD), a Cathode Ray Tube (CRT) or a Liquid Crystal on Silicon (LCoS) display Device, wherein the light Ray a emitted from the light source 11 is reflected or transmitted by the display Device such as the DMD, the CRT or the LCoS to be converted into an image light Ray B containing image information.

In this embodiment, the projection part 10 further includes a lens part 13, the lens part 13 converts the image light into projection light, the projection light is light emitted through a projection lens (such as the lens part 13 in this embodiment), the projection light is projected to a curtain (such as the imaging part 20 in this embodiment) and then imaged through light diffusion (such as diffuse transmission or diffuse reflection), and the projection light is illustrated as light C in fig. 2a and 2 b. The lens portion 13 includes at least one of a convex lens, a fresnel lens, or a concave lens, and the convex lens is illustrated in fig. 2a and 2b as an example; in a specific implementation process, in order to avoid the problems of aberration, dispersion and the like caused by a single lens, the lens portion 13 often includes a combination of a plurality of lenses, such as the combination of the convex lens, the concave lens and the fresnel lens, and the lens combination as a whole functions like the convex lens in fig. 2a and 2 b. The image light B passes through the lens portion 13 and then is converted into a projection light C, and the projection light C is focused at a specific position, such as a first position P1, as shown in fig. 2a and 2B, compared to the image light B; specifically, the projected light C is collected at the first position P1, and it can be considered that the projected light C emitted from each light-emitting point (e.g., pixel) on the image generating section 12 is collected at the first position P1, that is, the projected light C emitted from the image generating section 12 as a whole is collected at the first position P1 entirely or almost entirely after passing through the lens section 13. As will be understood by those skilled in the art, the first position P1 may be a plane or a curved surface, and specifically may be an image plane where the light emitted from the image generating unit 12 is imaged by the lens unit 13, and the distance between the first position P1 and the lens unit 13 (i.e. the image distance u) is related to the distance between the image generating unit 12 and the lens unit 13 (i.e. the object distance v) and the focal length of the lens unit 13 (i.e. the focal length f), for example, the distance between the image generating unit 12 and the lens unit 13 is between the one-time focal length and the two-time focal length of the lens unit 13, and the first position P1 is located outside the two-time focal length of the other side of the lens unit 13 (relative to the image generating unit 12), in this case, in fig. 2a and 2b, the line with the arrow at the image generating unit 12 facing downward represents the image formed by the image generating unit 12, and the line with the arrow at the first position P1 facing upward represents the real image plane formed at the first position P1 (i.e. the image plane), that is, when the distance between the image generating unit 12 and the lens unit 13 is between the one-time focal length and the two-time focal length of the lens unit 13, the image formed by passing through the lens unit 13 is an inverted and enlarged real image. Specifically, the distance u between the first position P1 and the lens unit 13, the distance v between the image generation unit 12 and the lens unit 13, and the focal length f of the lens unit 13 have the following relationship: 1/v + 1/u-1/f; when the lens portion 13 is a lens combination, the focal length f may specifically be an equivalent focal length of the lens combination.

In this embodiment, as shown in fig. 3, the imaging part 20 receives the projection light and forms a real image R, the imaging part 20 may be a transmissive light diffusion element, the projection light passes through the imaging part 20 in a rear projection manner, the real image R is formed at the imaging part 20 by light scattering effect (e.g. diffuse transmission effect), and the imaging light D formed by the real image R exits through the imaging part 20, as shown in fig. 2 a; the imaging part 20 may also be a reflective light diffusion element, such as a structure and a material similar to those of a front projection screen, the projection light is emitted to the imaging part 20, and a real image R is formed at the imaging part 20 by a light scattering effect (e.g. a diffuse reflection effect), and an imaging light D formed by the real image R is emitted in the form of a reflected light through the imaging part 20, as shown in fig. 2b, which is not limited in this embodiment.

It will be understood by those skilled in the art that the imaging portion 20 is disposed at the first position P1 to receive almost all of the projected light C, so that the real image R formed at the imaging portion 20 is complete and clear, and the emergent image light D can include all of the image information, i.e. the integrity of the image is not affected; in the side views shown in fig. 2a and 2b, the first position P1 coincides with the position of the image forming unit 20, and therefore the first position P1 coincides with the position of the label of the image forming unit 20 in fig. 2a and 2 b.

Fig. 3 shows a view of the imaging section 20 from another perspective, e.g., a front view; the ABC symbol in fig. 3 represents the display content of the real image R formed at the imaging section 20. As shown in fig. 3a, the size of the real image R is consistent with and completely coincides with the size of the imaging part 20, so that the imaging part 20 can be ensured to almost completely receive all the imaging light at the first position P1 (i.e. image plane); of course, the size of the imaging part 20 may be larger than that of the real image R, as shown in fig. 3b, that is, in this way, the imaging part 20 can be ensured to almost completely receive all the imaging light at the first position P1 (i.e., image plane), and the integrity of the real image R is ensured.

In the present embodiment, the projection unit 10 generates projection light by using the light source 11, the image generation unit 12, and the lens unit 13, and the imaging unit 20 is provided at the first position P1 where the projection light is collected, and forms the real image R at the imaging unit 20, and the real image emits R imaging light D; that is, in the present embodiment, the image source of the head-up display device is the real image R, that is, the image source can be regarded as a combination of the projection unit 10 and the imaging unit 20, and imaging light usable for imaging by the head-up display device is emitted from the real image R at the imaging unit 20. In other embodiments, the imaging light emitted from the imaging part 20 may further pass through an optical element having a refraction and/or reflection function, such as a lens and a reflector, and after the imaging light passes through the optical element for one or more times of refraction or reflection, the formed real image or virtual image may also be used as an image source of the head-up display device, which is not limited in this embodiment.

In the present embodiment, the reflective element 30 reflects the imaging light incident thereto to an external imaging device; the reflective element 30 may be a curved mirror 31, and specifically, the concave surface of the curved mirror 31 faces the imaging part 20, as shown in fig. 1 and 4; alternatively, the curved surface mirror 31 may be a free-form surface mirror, and a reflecting surface of the free-form surface mirror does not have a rotational symmetry characteristic, so that the imaging quality of the head-up display device can be improved.

Further, the reflection element 30 further includes at least one plane mirror 32, and the at least one plane mirror 32 is disposed between the curved mirror 31 and the imaging portion 20, as illustrated in fig. 4 by taking an example in which the head-up display device includes one plane mirror 32. The plane mirror 32 can change the propagation direction of the imaging light, and can compress the volume of the head-up display device, thereby further improving the practicability of the head-up display device.

In the present embodiment, the position of the real image R is changed by the adjusting device 40 to adjust the distance between the virtual image imaging position and the external imaging device, as shown in fig. 1, 4 and 5; specifically, the adjusting device 40 is connected to the projecting part 10 and the imaging part 20 through at least one of electrical connection and mechanical connection. According to the imaging principle of the head-up display device, the real image R formed at the imaging portion 20 emits imaging light, the imaging light is reflected by the curved surface mirror 31 and then emitted to the external imaging device 200, and after being reflected by the external imaging device 200, a virtual image V is formed at one side of the external imaging device 200 away from the head-up display device, as shown in fig. 5; in general, the external imaging device 200, such as a windshield, reflects light close to specular reflection, so that the external imaging device has little influence on the imaging distance of a virtual image, which is mainly determined by the curved mirror 31; according to the reflection imaging property of the concave reflector, under the condition that the optical distance between the object to be imaged and the concave reflector is smaller than the focal length of the curved reflector (namely, the object to be imaged is located within one-time focal length of the concave reflector), the image distance of the concave reflector is increased along with the increase of the object distance, namely, the optical distance between the object to be imaged and the concave reflector is larger, the imaging distance is larger, and the virtual image distance formed by the light reflected by the external imaging device 200 is larger.

Specifically, the optical distance may be considered as an optical propagation distance between the imaging light rays propagating to the reflecting element after being emitted, and specifically may be a product between a geometric distance of the light rays propagating and a refractive index of a propagation medium (such as air); as illustrated in the drawings of the present application by taking the principal axis ray propagation of the imaging ray as an example, the principal axis ray may be considered as a ray having the same or similar direction as the connecting line between the center point of the real image R and the center point of the curved reflector 31 (e.g., the geometric center of the plane surrounded by the four vertices of the curved reflector 31), and the direction of the principal axis ray represents the main direction of propagation of most of the imaging rays.

As can be seen from the above explanation of the projection unit 10 and the imaging unit 20, an image source of the head-up display device is a combination of the projection unit 10 and the imaging unit 20, and imaging light rays which can be used for imaging by the head-up display device are emitted from the real image R at the imaging unit 20, so that an optical distance between the real image R and the curved mirror 31 determines an imaging distance of a virtual image formed by the head-up display device, specifically, the larger the optical distance between the real image R and the curved mirror 31 is, the larger the imaging distance of the virtual image formed by the head-up display device is, that is, the optical distance between the real image R and the curved mirror 31 can be adjusted to adjust the imaging distance of the virtual image V formed by the head-up display device, that is, the distance between the imaging position of the virtual image and the external imaging device 200 can be adjusted. Alternatively, the imaging distance of the virtual image V formed by the heads-up display device may also be considered as the distance between the imaging position of the virtual image and the observation area (such as the eye box area) where the eyes of the user are located, and since the distance between the observation area and the external imaging device 200 is generally a fixed distance, in this case, the imaging distance of the virtual image V formed by the heads-up display device is still adjusted by adjusting the optical distance between the real image R and the curved mirror 31; in the case of including the plane mirror 32, the optical distance between the real image R and the curved mirror 31 specifically refers to the sum of the optical distances between the imaging light emitted to the plane mirror and reflected to the curved mirror by the plane mirror.

Since the curved mirror 31 has a large volume, the position of the curved mirror 31 is often difficult to adjust after installation, and therefore, the distance between the real image R and the curved mirror 31 is generally changed by adjusting the position of the real image R formed by the projection unit 10 at the imaging unit 20, so as to adjust the imaging position of the virtual image V formed by the heads-up display device.

Specifically, as can be seen from the above explanation of the projection unit 10, the position of the real image R is related to the focal length f of the lens unit 13 and the distance v between the image generation unit 12 and the lens unit, and specifically, the change of the position of the first position P1 where the light rays are converged is realized by changing the distance v and/or the focal length f; and synchronization requires adjusting the position of the imaging section 20 to coincide with the first position P1 so that the projected light ray D collected at the first position P1 forms the real image R at the imaging section 20 by diffuse transmission or diffuse reflection. In general, the light source 11, the image generating unit 12 and the lens unit 13 in the projection unit 10 are integrated into a single device, such as a liquid crystal projection device, a DLP projection device or a CRT projection device, so the distance v between the image generating unit 12 and the lens unit 13 is often difficult to adjust, and the focal length f of the lens unit 13 is relatively easy to adjust, for example, the lens unit 13 can adjust the optical power of the lens by using an optical zoom (optical zoom) lens, a digital zoom (digital zoom) lens or a double-shot zoom (Hybrid zoom) lens, etc., so as to change the focal length f; it will be understood by those skilled in the art that the focal length f can be adjusted by adjusting the focal power phi of the lens portion 13 to 1/f. Therefore, in a preferred embodiment of the present embodiment, the adjusting device 40 changes the first position P1 by adjusting the focal power of the lens portion 13, and changes the position of the imaging portion 20 to coincide with the first position P1, so as to change the position of the real image R; specifically, the imaging unit 20 moves along the direction of the main axis of the imaging light, and further ensures that as much projection light as possible is received.

Optionally, the adjusting device 40 includes a zoom adjusting device of the variable focus lens group 13, electrically or mechanically connected to the lens portion 13, and may be specifically an adjusting aperture of the focal power of the lens portion 13; the adjusting means 40 also comprise means for changing the position of the imaging section 20, in particular so that the imaging section 20 coincides with the changed first position P1.

In the embodiment, by providing the projection unit 10, the imaging unit 20, the reflective element 30 and the adjusting device 40, the position of the real image R can be adjusted by adjusting the focal power of the lens unit 13 in the projection unit 10 and the position of the imaging unit 20; and then realize the regulation to the formation of image position that new line display device becomes virtual image V through outside image device 200 reflection, realize that new line display device forms images in different distance departments, can match like pedestrian, vehicle or building with the outdoor scene of different distance departments, the user need not to make a round trip to switch between outdoor scene and virtual image like driver's sight, has avoided the convergence of vision conflict, has promoted new line display device's use experience.

On the basis of the above-described embodiment of the present application, the adjusting device 40 is mechanically connected to the imaging section 20. In one embodiment of the present embodiment, the adjusting device 40 includes a driving member and a gear, and the image forming portion 20 includes a rack extending in the moving direction, the rack being engaged with the gear; the center of the gear is connected with a driving part, such as a motor, which drives the gear to rotate, and the gear drives the rack to move back and forth, so that the position of the imaging part 20 can be adjusted.

In another embodiment of the present invention, the adjusting device 40 includes a driving member, a pair of gear assemblies and a crawler belt meshed with the gear assemblies, and the imaging portion 20 is fixedly connected to the crawler belt; the driving piece is connected with the gear train, and the driving piece drives the gear train and rotates like the motor, and the gear train drives the track conveying, and then drives imaging portion 20 and remove, has realized the regulation to imaging portion 20 position.

In another embodiment of the present embodiment, the adjusting device 40 includes a driving member, a sliding rail and a slider, and the slider is connected to the image forming portion 20; the driving piece drives the sliding block to move back and forth along the sliding rail, so as to drive the imaging part 20 to move, and the position of the imaging part 20 is adjusted.

On the basis of the above-mentioned embodiment of the present application, as shown in fig. 6, the adjusting device 40 further includes: the acquisition module 41, the acquisition module 41 is used for acquiring at least one of current user visual information and current vehicle driving information; the processing module 42, the processing module 42 receives the information collected by the collecting module 41, processes the information and converts the information into an adjusting instruction; and an adjusting module 43, wherein the adjusting module 43 receives and executes the adjusting instruction, and adjusts the emergent direction of the projection light ray C and the distance between the imaging part 20 and the reflecting element 30 so as to adjust the distance between the virtual image imaging position and the external imaging device 200.

In this embodiment, the acquisition module 41 may be specifically configured to acquire visual information of a current user, and includes an image acquisition subunit, a detection processing subunit, an illumination subunit, and the like, and the illumination subunit is used to emit light invisible to human eyes, such as infrared light, and emit the light to human eyes (such as eyeballs, pupils, or cornea, and the like) to be reflected; the image acquisition subunit captures the light reflected by human eyes and information carried by the reflected light, including but not limited to pupil center position, pupil size, cornea reflection information, iris center position, iris size and the like; the detection processing subunit receives and processes the information to obtain the visual information of the current user, and transmits the visual information of the current user to the processing module 42.

Optionally, the current user visual information comprises at least one of gaze time, gaze direction, or gaze convergence location; for example, the acquisition module 41 comprises an eye tracking device.

Optionally, the collection module 41 may also collect current vehicle driving information by the user. The collecting module 41 may be connected to an Advanced Driving Assistance System (ADAS) of the current vehicle, and further cooperate with a sensor or the like provided on the current vehicle to collect driving information of the current vehicle, such as a vehicle speed, a scene outside the vehicle, or a distance to an external object. The acquisition module 41 includes an image acquisition subunit, a detection subunit, a processing subunit, and the like, and acquires image information and distance information of an external environment, where the image information acquired by the image acquisition subunit includes, but is not limited to, objects of the external environment of the current vehicle, such as pedestrians, other vehicles, or buildings; the detection subunit detects and can detect the distance information between each object and the current vehicle; the processing subunit receives and processes the image information and the distance information, confirms the target object, and transmits the image information and the distance information of the target object to the processing module 42.

Optionally, determining the object corresponding to the minimum distance value as a target object, such as a pedestrian with the closest distance; alternatively, the object with the highest risk coefficient is determined as the target object, such as a rapidly approaching vehicle, a suddenly appearing pedestrian.

In this embodiment, the acquisition module 41 may acquire at least one of the user visual information and the current vehicle driving information, and the head-up display device may adjust an imaging position of the virtual image V according to the acquired information, for example, display the virtual image V in the direction of the line of sight; if the current user gazes at the convergence position as the imaging position of the virtual image V, and displaying the virtual image; for example, matching with the object in front, the position of the object is taken as the imaging position of the virtual image V, and the virtual image is displayed.

In this embodiment, the processing module 42 receives and processes the information sent by the acquisition module 41, and converts the information into an adjustment instruction of the head-up display device, where the adjustment instruction may be used to adjust imaging information of the head-up display device, and includes at least one of an imaging position, an imaging distance (a distance from two eyes of a current user, such as a driver, to an imaging position of the virtual image V), and an imaging lower viewing angle (an included angle between a connecting line between a sight of the current user, such as the driver, and a midpoint of the virtual image V and a horizontal direction); specifically, the parameters of the optical reflection system of the head-up display device may be pre-stored in the processing module 42, and the processing module processes the object distance (i.e. the distance between the real image R/imaging portion 20 and the curved surface mirror 31), the angle set by the real image R/imaging portion 20, and the like of the head-up display device at this time by using the received information and the pre-stored optical parameters, and converts the parameters into the adjustment instruction corresponding to the adjustment module 40. Optionally, the adjustment instruction comprises: an instruction to adjust the power of the lens section 13 and an instruction to adjust the position of the imaging section 20.

In this embodiment, the adjusting module 43 receives the adjusting instruction sent by the processing module 42, and executes the adjusting instruction, so that the adjusted head-up display device forms an image at a specified distance; for example, the specified distance is a distance between the target object and the current vehicle; for example, the specified distance is a distance between the current user gaze convergence location and the user eyes.

Specifically, as shown in fig. 7, the adjustment device 40 of the head-up display device is configured to perform the following adjustment mechanism:

a. the acquisition module 41 acquires at least one of current user visual information and current vehicle driving information;

b. the processing module 42 receives the collected information and confirms the imaging distance of the virtual image V matched with the collected information; for example, it may be the user's gaze convergence location, distance of target object location, etc.;

c. obtaining optical parameters of the head-up display device according to the imaging distance of the virtual image V; for example, it may be a distance and a position where the imaging section 20 moves, the power of the lens section 13, or the like;

d. and confirming the optical parameters to be adjusted, and controlling the corresponding elements to adjust.

It should be noted that the above-mentioned adjusting mechanism can be stored and executed in the form of a computer program, and the various modules of the above-mentioned adjusting device 40 can be implemented by software or hardware, and for the latter, can be implemented by the following ways, but is not limited to this: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.

In the embodiment of the application, the current user visual information and/or the current vehicle driving information are acquired through the acquisition module 41, the information is processed and converted into the adjustment instruction through the processing module 42, the imaging position of the real image R of the head-up display device is adjusted through the adjustment module 43, further, the adjustment of the imaging position of the virtual image V is realized, the head-up display device can form images at different imaging positions, for example, the driver sight line convergence position (namely, the gaze convergence position) or the target object position, the driver sight line does not need to be switched back and forth between the real scene and the virtual image, the visual convergence conflict is avoided, and the use experience and the driving safety of the head-up display device are improved.

In the above embodiments of the present application, the distance between the imaging part 20 and the reflective element 30 is smaller than or equal to the focal length of the reflective element 30. Specifically, the distance between the imaging unit 20 and the curved mirror 31 is smaller than or equal to the focal length of the curved mirror 31. As explained in the foregoing principle of imaging the curved reflector 31, when the distance between the imaging part 20 and the curved reflector 31 is less than or equal to the focal length of the curved reflector 31, that is, the distance between the real image R and the curved reflector 31 is less than or equal to the focal length of the curved reflector 31, an upright enlarged virtual image can be formed, and then the virtual image is reflected by the external imaging device 200 to form an enlarged virtual image for the current user, such as a driver; and, formation of image portion 20 is close to focal plane (also be between about being close to the focus), and the formation of image distance of final virtual image V is more far away, when formation of image portion 20 is very close to focal plane, if and when the distance between the focal plane is 0.1%, 0.5%, 1% or 5% focus, or formation of image portion 20 sets up when focal plane department, the formation of image distance of virtual image V is very far away this moment, can regard as even to set up at infinity, remote virtual image V is fit for carrying out the reinforcing with the car object and shows the integration, can further promote new line display device's use experience.

On the basis of the above embodiments of the present application, as shown in fig. 8, the head-up display device further includes a package housing 50, and the projection unit 10, the imaging unit 20, the reflective element 30 and the adjusting device 40 are all installed in the package housing 50; the package housing includes a light exit 51 for exiting light, and the imaging light reflected by the reflection element 30 exits to the external imaging device 20 through the light exit 51, reflects and forms a virtual image V. Specifically, when the head-up display device of the present application is applied to a vehicle, the package housing 50 is installed inside a dashboard of the vehicle, and the light outlet 51 is disposed on a surface of the dashboard.

Optionally, the package housing 50 further includes a dust-proof film 52 and an anti-glare cover 53, and the dust-proof film 52 is specifically disposed at the light outlet 51, so that the marked positions of the light outlet 51 and the dust-proof film 52 coincide in fig. 8. The dustproof film 52 can prevent dust, impurities, moisture and the like from entering the interior of the package housing 50, and prevent the impurities from affecting and damaging elements of the head-up display device; meanwhile, the dustproof film 52 cannot block the exit of the imaging light, so the dustproof film 52 is made of a transparent material, such as a film made of a transparent polymer material, and is disposed at the light exit 51 by bonding, sandwiching, or the like.

Although the dustproof film 52 made of transparent material can block external impurities, external light can be reflected on the surface of the dustproof film 52; when the intensity of the external light is high, for example, the sunlight is reflected on the surface of the dustproof film 52, strong glare is caused, and the glare can cause serious interference to the normal driving of the current user, such as a driver. Optionally, an anti-glare cover 53 is further disposed on an outer side of the dustproof film 52, and the anti-glare cover 53 may be an inclined surface disposed obliquely, and is configured to prevent external light from being dazzled at the dustproof film 52 and entering the eyes of the user. Referring to fig. 8, the antiglare shield 53 may at least partially block ambient light, such as sunlight; and does not block the propagation of the imaging light. The antiglare shield 53 may be made of the same material as the package housing 50 and may be integrally formed, or may be separately mounted on the package housing 50, which is not limited in this embodiment.

In this embodiment, the elements of the head-up display device are mounted by the packaging case 50, so that the whole head-up display device can be conveniently dismounted and mounted; meanwhile, by arranging the dustproof film 52 and the anti-dazzle light shield 53, foreign matters such as dust can be prevented from entering the interior of the device to influence normal use, the influence of glare on a driver can be avoided, and the use experience of the head-up display device is further improved.

The embodiment of the present application further provides a head-up display system with a variable imaging distance, as shown in fig. 5, including the head-up display device provided in the above embodiment, and an external imaging device 200; wherein the external imaging device 200 is configured to reflect the imaging light and form a virtual image V on a side of the external imaging device 200 remote from the heads-up display device.

In this embodiment, after the imaging light emitted by the head-up display device is reflected by the external imaging device 200, most of the reflected light is collected in the observation area EB, so that a user with two eyes in the observation area EB, such as a driver, can view a virtual image V formed by reflection of the external imaging device 200; the external imaging device 200 reflects the imaging light and transmits the external light, so that the user can receive the external light, i.e., the observation of the external environment is not affected. Specifically, the observation region EB may be an eye box (eyebox) region, which is a region where both eyes of the user are located and where a virtual image of the heads-up display device can be seen; the two eyes of the user deviate from the center of the eye box area by a certain distance, for example, when the two eyes of the user move up and down and left and right by a certain distance, the user can still see the virtual image V formed by the head-up display device as long as the two eyes of the user are still in the eye box area.

In this embodiment, the external imaging device 200 may be a Windshield of a vehicle, or an imaging window separately disposed and respectively corresponding to a Windshield head-up display device (Windshield-HUD) and a combined head-up display device (Combiner-HUD); the external imaging device 200 includes a plane surface shape or a curved surface shape, and when the external imaging device 200 is a curved surface shape, the position of the virtual image V varies due to observation at different positions, and thus the imaging position of the virtual image V refers to the imaging position of the virtual image V observed when the user, such as a driver, is present in the eye box region.

In this embodiment, the imaging position of the virtual image V may be adjusted, and imaging may be performed at a desired position; in some preferred embodiments, the virtual image V may be a close-up view, a middle-view, or a long-view, where the close-up view is a view with a distance of 2-4 m between the imaging position of the virtual image V and the observation area EB, the middle-view is a view with a distance of 7-14 m between the imaging position of the virtual image V and the observation area EB, and the long-view is a view with a distance of 20-50 m between the imaging position of the virtual image V and the observation area EB. Specifically, the close-range view may display key driving data such as vehicle instruments, for example, parameters such as vehicle speed, oil amount, or steering; the medium scene picture can display a lane picture, for example, the picture is better matched with an actual lane when the picture is in an inclined state relative to the ground, so that a user can see the image fusion mark of the lane and guide the user to walk on the lane; the distant scene picture can be matched with the distant scene, for example, the distant scene picture can comprise the mark of the bank, and the mark image of the bank can be matched and fused with the position of the real scene of the bank, so that when the user can see a distant building, for example, the bank, the mark of the bank is identified in the distant scene picture.

On the basis of the above embodiments of the present application, the projection part 10 includes a first projection part and a second projection part, which respectively emit a first projection light and a second projection light; the first projected light is emitted to the imaging part 20 and forms a first real image R1, the second projected light is emitted to the imaging part 20 and forms a second real image R2, and the first real image R1 and the second real image R2 are configured to have different display contents, as shown in fig. 9; fig. 9 shows a front view of the imaging section 20 in the present embodiment, and the first real image R1 and the second real image R2 having different display contents are represented by ABC marks different in color, respectively.

Specifically, the first real image R1 and the second real image R2 have different display contents, and it can be considered that the first real image R1 and the second real image R2 respectively display contents of the same object corresponding to different viewing angles; for example, the first real image R1 shows the display content corresponding to the left eye of the current user, the second real image R2 shows the display content corresponding to the right eye of the current user, and the first real image R1 and the second real image R2 can be synthesized as a stereoscopic real image. The first real image R1 and the second real image R2 emit corresponding first imaging light rays and second imaging light rays, which are reflected by the reflective element 30 and the external imaging device 200 in sequence, so that a user with two eyes in the observation area EB can simultaneously observe the first virtual image V1 and the second virtual image V2 formed by the first real image R1 and the second real image R2, respectively.

On the basis of the above embodiments of the present application, a user with two eyes in the observation area EB can simultaneously observe the first virtual image V1 and the second virtual image V2 formed by the first real image R1 and the second real image R2, respectively, but both the left eye and the right eye of the user can simultaneously receive the first virtual image V1 and the second virtual image V2, and cannot distinguish between them, so that stereoscopic vision cannot be generated, and the user sees two overlapped pictures.

In the present embodiment, the auxiliary imaging device 300 is provided in the head-up display system, the auxiliary imaging device 300 is configured to have the first viewing section 301 and the second viewing section 302, the first viewing section 301 is configured to pass the first imaging light emitted from the first real image R1 and block the second imaging light emitted from the second real image R2; the second viewing section is configured to pass the second imaged light rays emitted from the second real image R2 and block the first imaged light rays emitted from the first real image R1, as shown in fig. 10. The auxiliary imaging device 300 is disposed on an optical path of the reflected imaging light between the external imaging apparatus 200 and the eyes of the current user, and may be specifically disposed at the observation area EB; the first viewing portion 301 and the second viewing portion 302 correspond to the left eye and the right eye of the current user respectively, and are configured to block the imaging light rays corresponding to the right eye and the left eye respectively through absorption or reflection, so that the left eye of the current user only receives the first imaging light rays corresponding to the first real image R1, the right eye only receives the second imaging light rays corresponding to the second real image R2, that is, the left eye only can observe the first virtual image V1 formed by reflection of the first real image R1, and the right eye only can observe the second virtual image R2 formed by reflection of the second real image R2.

As shown in FIG. 10, a schematic diagram of the heads-up display system from the current user perspective is shown; the auxiliary imaging apparatus 300 is disposed on the light path of the reflected light between the current user's eyes and the external imaging device 200, and the black ABC symbol represents a first virtual image V1 formed by the first real image R1 being reflected, and the gray ABC symbol represents a second virtual image V2 formed by the second real image R1 being reflected; the first viewing section 301 corresponds to the left eye, passes through the reflected light rays (indicated by the dashed lines in the figure) corresponding to the first virtual image V1, and blocks the reflected light rays (indicated by the solid lines in the figure) corresponding to the second virtual image V2; the second portion 302 of watching corresponds the right eye, through the reflection ray that corresponds second virtual image V2 to the separation corresponds the reflection ray of first virtual image V1, thereby realizes that user's left eye and right eye only see the virtual image that corresponds respectively, thereby realizes that the stereovision sees the sense, and the user can see the virtual image of stereovision. It should be understood that the first and second virtual images V1 and V2 in fig. 10 are formed on the outer side of the external imaging apparatus 200, which is away from the user, instead of the surface of the external imaging apparatus 200.

In this embodiment, the left-eye image and the right-eye image are distinguished by the properties of the first projection light and the second projection light and the properties of the auxiliary imaging device 300. Specifically, the projection light is different from the imaging light in that the projection light forms a real image by diffuse reflection or diffuse transmission property after passing through the imaging portion 20, the real image emits the imaging light, and properties of the light such as a polarization state, a wavelength distribution, and the like hardly change; thus, by controlling the properties of the first projection light and the second projection light, the properties of the first imaging light and the second imaging light can be controlled, and the properties of the projection light can be considered to be the same as the properties of the imaging light.

In an implementation manner of this embodiment, the first projection light includes light of a first polarization state, and the second projection light includes light of a second polarization state; and the first polarization state is perpendicular to the second polarization state; at this time, the first viewing portion 301 transmits the light of the first polarization state and reflects and/or absorbs the light of the second polarization state; the second viewing portion 302 transmits the light of the second polarization state and reflects and/or absorbs the light of the first polarization state.

For example, one of the first polarized light and the second polarized light comprises light in the S polarization state and the other comprises light in the P polarization state; the first polarized light and the second polarized light may also be non-S polarized light or non-P polarized light, as long as the polarization directions of the first polarized light and the second polarized light are perpendicular, for example, the first polarized light and the second polarized light may be two linearly polarized lights with mutually perpendicular polarization directions, or two circularly polarized lights with mutually perpendicular polarization directions, or two elliptically polarized lights with mutually perpendicular polarization directions, and the like.

For example, the transmittance of the first viewing section 301 for the first polarized light may be 70%, 80%, 90%, 95% or another suitable value, the blocking ratio (sum of reflectance and absorptance) for the second polarized light may be 70%, 80%, 90%, 95% or another suitable value, and as many first imaging light rays corresponding to the first virtual image V1 as possible may be transmitted; the transmittance of the second viewing portion 302 with respect to the second polarized light rays may be 70%, 80%, 90%, 95% or another suitable value, and the blocking ratio (sum of reflectance and absorptance) with respect to the first polarized light rays may be 70%, 80%, 90%, 95% or another suitable value, so that as many second imaging light rays corresponding to the second virtual image V2 as possible are transmitted, and the luminance of the created stereoscopic virtual image can be improved.

For example, the first projection unit and the second projection unit may be a display device that emits polarized projection light, such as a liquid crystal projector, that is, the image generation unit 12 is a liquid crystal display layer; for example, the auxiliary imaging device 300 may be polarized stereoscopic glasses.

In another embodiment of this embodiment, the first projected light includes light of a first specific wavelength band, the second projected light includes light of a second specific wavelength band, and the light of the first specific wavelength band includes at least one of a first red wavelength band, a first green wavelength band, and a first blue wavelength band; the second specific wavelength band of light includes at least one of a second red wavelength band, a second green wavelength band and a second blue wavelength band; the first specific wave band and the second specific wave band are not overlapped; at this time, the first viewing portion 301 transmits the light of the first specific wavelength band and reflects and/or absorbs the light of the second specific wavelength band; the second viewing portion 302 transmits the light of the second specific wavelength band and reflects and/or absorbs the light of the first specific wavelength band.

For example, in the first specific waveband and the second specific waveband, the full width at half maximum of each waveband of R (red), G (green) and B (blue) is not more than 50nm, the peak position of the blue waveband is located in the interval range of 410nm to 480nm, the peak position of the green waveband is located in the interval range of 500nm to 580nm, and the peak position of the red waveband is located in the interval range of 590nm to 690nm, as long as it is ensured that the first specific waveband and the second specific waveband are not overlapped, that is, the first red waveband and the second red waveband are not overlapped, the first green waveband and the second green waveband are not overlapped, and the first blue waveband and the second blue waveband are not overlapped.

For example, in the first specific wavelength band, the first red wavelength band is 650nm red light, the first green wavelength band is 540nm, and the first blue wavelength band is 430nm blue light; in the second specific waveband, the second red waveband is 620nm red light, the second green waveband is 550nm green light, and the second blue waveband is 420nm blue light.

For example, the transmittance of the first viewing portion 301 with respect to the light rays of the first specific wavelength band may be 70%, 80%, 90%, 95% or another suitable value, the blocking ratio (sum of reflectance and absorptance) with respect to the light rays of the second specific wavelength band may be 70%, 80%, 90%, 95% or another suitable value, and as many first imaging light rays corresponding to the first virtual image V1 as possible may be transmitted; the transmittance of the second viewing portion 302 with respect to the light rays of the second specific wavelength band may be 70%, 80%, 90%, 95% or another suitable value, and the blocking ratio (sum of reflectance and absorptance) with respect to the light rays of the first specific wavelength band may be 70%, 80%, 90%, 95% or another suitable value, so that as many second imaging light rays corresponding to the second virtual image V2 as possible are transmitted, and the luminance of the created stereoscopic virtual image can be improved.

For example, the first and second projecting parts may be display devices that emit RGB mixed projection light, such as a liquid crystal projector, a CRT projector, or a DLP projector; for example, the auxiliary imaging device 300 may be a chromatic stereoscopic glasses.

For example, the lens of the above-mentioned color difference type stereoscopic glasses may include a selective transflective film formed by stacking an inorganic oxide thin film or a polymer thin film, and the transflective film is formed by stacking at least two film layers having different refractive indexes. The term "different refractive index" as used herein means that the refractive index of the film layer differs in at least one of the xyz three directions. For example, by selecting desired film layers with different refractive indexes in advance and stacking the film layers in a preset order, a transflective film having selective reflection and selective transmission characteristics can be formed, and the transflective film can selectively reflect light of one characteristic and transmit light of another characteristic. For example, for a film layer using an inorganic oxide material, the composition of the film layer is selected from one or more of tantalum pentoxide, titanium dioxide, magnesium oxide, zinc oxide, zirconium oxide, silicon dioxide, magnesium fluoride, silicon nitride, silicon oxynitride, and aluminum fluoride. For example, for a film layer using an organic polymer material, the film layer of the organic polymer material includes at least two thermoplastic organic polymer film layers. For example, two thermoplastic polymer film layers are alternately arranged to form an optical film, and the refractive indices of the two thermoplastic polymer film layers are different. For example, the molecules of the organic polymer material are chain-like structures, and the molecules are arranged in a certain direction after stretching, so that the refractive indexes in different directions are different, that is, a desired film can be formed by a specific stretching process. For example, the thermoplastic polymer may be polyethylene terephthalate (PET) and its derivatives with different degrees of polymerization, polyethylene naphthalate (PEN) and its derivatives with different degrees of polymerization, polybutylene terephthalate (PBT) and its derivatives with different degrees of polymerization, or the like.

In this embodiment, through setting up first projection, second projection and auxiliary imaging device 300, can make current user's left eye and right eye only receive the first image light of the first virtual image V1 that corresponds the left eye visual angle and the second image light of the second virtual image V2 that corresponds the right eye visual angle respectively, make the user can observe and form outside imaging device 200 the outside, the virtual image that has the stereovision, the virtual image of stereovision not only can provide abundanter use experience, and because the outdoor real scene is three-dimensional spatial structure for the majority, consequently, the new line display device forms the virtual image of stereovision, compare in ordinary two-dimensional plane virtual image, it is better with the matching effect of the real three-dimensional real scene of car, can further promote new line display device's use experience.

Based on the above embodiments of the present application, the external imaging device 200, such as a windshield, often has a certain thickness; therefore, the main virtual image can be formed by reflecting the imaging light on the surface close to the observer side, and the auxiliary virtual image can be formed by reflecting the transmitted imaging light on the inner surface far away from the observer side again, that is, when the head-up display system is used, the main virtual image and the auxiliary virtual image can be seen at the same time, that is, double images can be generated.

In one embodiment of this embodiment, the external imaging device 200 comprises a windshield having a double glazing structure with a wedge-shaped membrane disposed therebetween, the wedge-shaped membrane having a varying thickness, with the thicker end facing upward; after the wedge-shaped film is arranged, when the external imaging device 200 reflects to form a virtual image, the main virtual image formed by reflection of the inner surface and the outer surface of the glass coincides with the auxiliary virtual image, so that the head-up display system has the function of eliminating double images, and the use experience is improved. Specifically, the wedge-shaped film comprises a polyvinyl butyral (PVB) film.

In another embodiment of the present embodiment, a phase retardation element is attached to a surface of the external imaging device 200 away from the virtual image to eliminate ghost images. For example, the light emitted from the head-up display device includes a first linear polarization state, and the phase retardation element can convert the first linear polarization state of the incident light into at least one of a second linear polarization state, a circular polarization state, or an elliptical polarization state. Specifically, the light emitted by the head-up display device includes light in an S-polarization state, the phase retardation element can convert the light in the S-polarization state entering the phase retardation element into light in a non-S-polarization state, such as light in a P-polarization state, circularly polarized light or elliptically polarized light, and the reflectivity of the light in the non-S-polarization state on the inner surface of the outer side of the external imaging device 200 is very low, so that the light is basically transmitted out of the glass, double images are eliminated, and the use experience is improved; specifically, the phase retardation element may be an 1/4 wave plate or a 1/2 wave plate.

In another embodiment of the present embodiment, the external imaging device 200 is attached with a selective reflection film on the side facing away from the virtual image to eliminate the ghost image. For example, the selective reflection film is configured to have a first reflectance for the imaging light and a second reflectance for light other than the imaging light band, and the first reflectance is greater than the second reflectance. For example, the first reflectivity of the selective reflective film for light in the wavelength band of the imaging light may be greater than 80%, 90%, 95%, 99.5%, or other suitable values, and the second reflectivity for light in a wavelength band other than the wavelength band of the imaging light may be less than 30%, 20%, 10%, 5%, 1%, 0.5%, or other suitable values; if the imaging light comprises light of three sub-wave bands of red, green and blue (RGB), the selective reflection film only reflects the light of the three sub-wave bands of RGB and transmits the light of other wave bands. Therefore, the image light is not reflected twice on the inner surface of the external imaging device 200 on the side away from the user, and the ghost image is eliminated.

In another implementation manner of this embodiment, a P-polarized light reflecting film is attached to a surface of the external imaging device 200 on a side away from the virtual image, and the imaging light emitted by the head-up display device includes light in a P-polarized state, because glass has a high transmittance for P-polarized light and a low reflectance, most of the P-polarized light transmitted through the glass will be transmitted outside the glass except the P-polarized light reflected by the P-polarized light reflecting film, and the brightness of the light reflected by an inner surface of the external imaging device 200 on a side away from the user is low, so that ghost images can be eliminated.

In the embodiment of the application, the wedge-shaped film, the phase delay element, the selective reflection film or the P-polarized light reflection film and the like are additionally arranged at the external imaging device 200, so that ghost images can be effectively eliminated, and the use experience of the head-up display system is improved.

Based on the above embodiments of the present application, when the external imaging device 200 is a windshield, the reflectance of the windshield to the S-polarized light (S-polarized light) is high, so the imaging light emitted from the head-up display device generally includes S-polarized light, and at this time, if a user such as a driver wears sunglasses, the sunglasses filter the S-polarized light, so the driver cannot see the image of the head-up display device when wearing the sunglasses.

In an implementation manner of this embodiment, a P-polarization light reflection film is attached to a surface of one side of the external imaging device 200 away from the virtual image, and the image light emitted by the head-up display device includes light in a P-polarization state, and the external imaging device 200 can reflect the image light in the P-polarization state to the observation area EB, so that the user wearing the sunglasses with two eyes in the observation area EB can still see the image, thereby improving the user experience.

In another embodiment of this embodiment, a switching element may also be provided between the heads-up display device and the external imaging device 200 to implement the sunglass-visible function; specifically, the conversion element includes a quarter-wave plate, the image light emitted by the head-up display device includes light in an S polarization state, the conversion element converts the light in the S polarization state incident thereto into light in a circular polarization state (circularly polarized light) or light in an elliptical polarization state (elliptically polarized light), the circularly polarized light or the elliptically polarized light is reflected by the external imaging device 200 and then emitted to the observation area EB, and the user wearing the sunglasses with his both eyes in the observation area EB can still see the image displayed by the head-up display device due to the fact that the circularly polarized light or the elliptically polarized light includes a P polarization component and is filtered by the sunglasses, so that the user experience is improved; specifically, the conversion element may be provided at the position of the light exit 51; for example, it may be integrally provided as a one-piece member with the dust-proof film 52.

The above is only the preferred embodiment of the present application, and it should be noted that: it will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the principles of the application, and such modifications and enhancements are intended to be included within the scope of the application.

Claims

1. A head-up display device with a variable imaging distance, comprising:

a projection section configured to emit a projection light, the projection section including: a light source configured to emit light rays, an image generating section configured to convert the light rays emitted from the light source into image light rays, and a lens section configured to convert the image light rays into projection light rays, the projection light rays being condensed at a first position;

an imaging part configured to receive the projected light to form a real image, the imaging part being disposed at a first position, the imaging light formed by the real image being emitted through the imaging part;

a reflection element configured to reflect the imaging light rays incident thereto to an external imaging device, the imaging light rays reflected by the reflection element being reflected by the external imaging device and forming a virtual image;

and an adjustment device configured to change a position of the real image to adjust a distance between the virtual image imaging position and the external imaging device.

2. The heads-up display device of claim 1 wherein the adjustment device is configured to:

changing the optical power of the lens portion to change the first position;

and changing a distance between the imaging portion and the reflective element so that the imaging portion coincides with the changed first position.

3. The heads-up display device of claim 2 wherein the adjustment means comprises:

the acquisition module is used for acquiring at least one of current user visual information and current vehicle driving information;

the processing module receives the information acquired by the acquisition module, processes the information and converts the information into an adjustment instruction;

an adjustment module that receives and executes the adjustment instruction, adjusts an optical power of the lens portion, and a distance between the imaging portion and the reflection element to adjust a distance between the virtual image imaging position and the external imaging device.

4. The heads-up display device of claim 3 wherein the user visual information comprises: at least one of gaze time, gaze direction, or gaze convergence position.

5. The heads-up display device of claim 3 wherein the vehicle driving information includes: at least one of vehicle speed information and distance information.

6. The heads-up display device of claim 1 wherein the reflective element comprises at least one curved mirror.

7. The head-up display device according to claim 6, wherein a distance between the imaging portion and the reflective element is smaller than or equal to a focal length of the reflective element.

8. A variable imaging distance heads-up display system comprising:

the heads-up display device of any one of claims 1-7; and

an external imaging device;

wherein the external imaging device is configured to reflect the imaging light rays and form a virtual image on a side of the external imaging device away from the heads-up display device.

9. The head-up display system of claim 8, wherein the projection unit comprises a first projection unit and a second projection unit, and the first projection unit and the second projection unit emit a first projection light and a second projection light, respectively;

the first projection light is emitted to the imaging part and forms a first real image, the second projection light is emitted to the imaging part and forms a second real image, and the first real image and the second real image are configured to have different display contents.

10. The heads-up display system of claim 9 further comprising: an auxiliary imaging device; the auxiliary imaging device is configured to have a first viewing portion and a second viewing portion;

the first viewing part is configured to pass first imaging light rays emitted by the first real image and block second imaging light rays emitted by the second real image;

the second viewing portion is configured to pass second imaging light rays emitted by the second real image and block first imaging light rays emitted by the first real image.

11. The heads-up display system of claim 10 wherein the first projected light includes light of a first polarization state and the second projected light includes light of a second polarization state; and the first polarization state is perpendicular to the second polarization state.

12. The heads-up display system of claim 10 wherein the first projected light includes a first specific wavelength band of light and the second projected light includes a second specific wavelength band of light;

the first specific wavelength band of light includes at least one of a first red wavelength band, a first green wavelength band and a first blue wavelength band;

the second specific wave band of light comprises at least one wave band of a second red wave band, a second green wave band and a second blue wave band;

and the first specific wavelength band is not coincident with the second specific wavelength band.

13. The heads-up display system of claim 8 further comprising: the phase delay element is attached to one side, far away from the virtual image, of the external imaging device;

the imaging light includes light of a first linear polarization state, and the phase retarding element is configured to convert the light of the first linear polarization state into at least one of light of a second linear polarization state, light of a circular polarization state, or light of an elliptical polarization state.

14. The heads-up display system of claim 8 further comprising: the selective reflection film is attached to one side, away from the virtual image, of the external imaging device;

the selective reflection film is configured to have a first reflectivity for light in a wavelength band in which the imaging light is located and a second reflectivity for light in a wavelength band other than the imaging light;

and the first reflectivity is greater than the second reflectivity.