A head-up display system and a motor vehicle

Abstract

The application discloses a head-up display system and a motor vehicle, and the head-up display system comprises a plurality of light sources, a light guide element, a split light diffusion element, an image forming element and a transflective element, light emitted by the plurality of light sources is transmitted to the image forming element through the light guide element, the split light diffusion element diffuses the light emitted by the light sources into at least two light beams in different directions, each of the light beams comprises a preset shaped cross section, the image forming element converts the light into image light, the image light is reflected on the transflective element, and the reflected light is shot to at least two different observation areas. Through the head-up display system provided by the embodiment of the application, different observers in a vehicle can observe images in at least two areas, and the application can be expanded to multiple people and multiple angle watching, the use experience and convenience of the HUD are improved, and the application scene of the HUD is expanded.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of optical display technology, and particularly relates to a head-up display system and a motor vehicle. BACKGROUND

[0002] The HUD (head up display) is a kind of optical design by reflection, which projects the light emitted by the image source onto the imaging window (imaging plate, windshield, etc.), so that the driver can directly see the picture without lowering his head, thereby avoiding the distraction caused by the driver's lowering his head to look at the instrument panel during driving, improving the driving safety factor, and also bringing a better driving experience. The light emitted by the HUD image source is reflected on the transparent imaging window, and the reflected light enters the driver's eyes, so that the driver can see the virtual image of the picture displayed on the HUD image source presented on the other side of the imaging window. At the same time, the ambient light on the other side of the transparent imaging window can still be transmitted, so that the driver can see the HUD image while still observing the outside situation during driving.

[0003] However, the existing HUD design can basically only be observed in one area, such as the image observed by the driver in the driver's place, which brings many inconveniences in actual use and limits the application scenarios and further promotion of the HUD. SUMMARY

[0004] In order to overcome the problem of limited HUD viewing angle in the prior art, the present application provides a head-up display system and a motor vehicle.

[0005] One aspect of the present application provides a head-up display system, comprising: a plurality of light sources, a light guide element, a separate light diffusion element, and an image forming element.

[0006] The plurality of light sources are arranged in a light source linear array along a first direction, and the plurality of light sources are configured to generate light by electrical energy;

[0007] The light guide element is arranged in the light emitting direction of the plurality of light sources; the inner reflection surface of the light guide element faces the plurality of light sources and forms an internal space allowing light to pass through; and the light emitted by the plurality of light sources is transmitted to the image forming element through the internal space formed by the light guide element;

[0008] The separate light diffusion element diffuses the light emitted by the plurality of light sources into at least two light beams in different directions, and each light beam includes a preset shaped cross section;

[0009] The image forming element converts the light emitted by the plurality of light sources into image light.

[0010] In one implementation of the present application, the head-up display system further comprises a transflective element.

[0011] The trans-reflection element is arranged on the side of the image forming element away from the plurality of light sources, and the image light is reflected on the trans-reflection element, and the reflected light is projected to at least two different observation areas;

[0012] The light guide element, the separate light diffusion element and the image forming element are arranged between the plurality of light sources and the trans-reflection element.

[0013] In another implementation manner of the present application, the light guide element, the separate light diffusion element and the image forming element are sequentially arranged between the plurality of light sources and the trans-reflection element.

[0014] In another implementation manner of the present application, the light guide element, the image forming element and the separate light diffusion element are sequentially arranged between the plurality of light sources and the trans-reflection element.

[0015] In another implementation manner of the present application, the head-up display system comprises a plurality of light source linear arrays arranged along a second direction;

[0016] The plurality of light guide elements are arranged in the light emitting direction of the corresponding light source linear array.

[0017] In another implementation manner of the present application, the light guide element comprises a hollow shell provided with an inner reflection surface;

[0018] The hollow shell comprises an end portion for arranging the plurality of light sources and a light emitting opening away from the end portion;

[0019] The size of the light emitting opening is greater than the size of the end portion.

[0020] In another implementation manner of the present application, the light emitting opening of the hollow shell faces the image forming element;

[0021] The light emitted by the plurality of light sources is transmitted in the internal space of the hollow shell and reflected on the inner reflection surface, and the reflected light is transmitted to the image forming element through the light emitting opening.

[0022] In another implementation manner of the present application, the hollow shell comprises a first inner reflection surface and a second inner reflection surface arranged oppositely;

[0023] The first inner reflection surface and the second inner reflection surface extend along the first direction.

[0024] In another implementation manner of the present application, the hollow shell further comprises a third inner reflection surface and a fourth inner reflection surface arranged oppositely;

[0025] The third inner reflection surface is connected with the first inner reflection surface and the second inner reflection surface respectively.

[0026] The fourth inner reflection surface respectively connects with the first inner reflection surface and the second inner reflection surface.

[0027] In another implementation manner of the present application, the length of the first inner reflection surface and the second inner reflection surface extending along the first direction is greater than the length of the part where the third inner reflection surface connects with the first inner reflection surface and the second inner reflection surface.

[0028] And / or, the length of the first inner reflection surface and the second inner reflection surface extending along the first direction is greater than the length of the part where the fourth inner reflection surface connects with the first inner reflection surface and the second inner reflection surface.

[0029] In another implementation manner of the present application, the inner reflection surface of the hollow shell comprises a planar surface shape or a curved surface shape.

[0030] In another implementation manner of the present application, the image forming element comprises a liquid crystal display panel.

[0031] In another implementation manner of the present application, the split light diffusion element comprises a light ray orientation layer and a light ray diffusion layer.

[0032] The light ray orientation layer emits the light rays emitted by the plurality of light sources in at least two different directions.

[0033] The light ray diffusion layer diffuses the light rays emitted in at least two different directions into at least two light beams.

[0034] The light ray orientation layer is towards the plurality of light sources, and the light ray diffusion layer is arranged on the side of the light ray orientation layer away from the plurality of light sources.

[0035] In another implementation manner of the present application, the head-up display system further comprises a collimating element.

[0036] The collimating element is arranged between the plurality of light sources and the image forming element.

[0037] The collimating element adjusts the light rays emitted by the plurality of light sources into parallel light rays.

[0038] In another implementation manner of the present application, the collimating element is arranged inside the hollow shell, and the size of the collimating element is smaller than the size of the light emitting opening of the hollow shell.

[0039] In another implementation manner of the present application, the collimating element is arranged outside the light emitting opening of the hollow shell, and the size of the collimating element is greater than or equal to the size of the light emitting opening of the hollow shell.

[0040] In another implementation form of the invention, the collimating element comprises at least one of a collimating lens or a collimating film.

[0041] In another implementation form of the invention, the collimating lens comprises one or more of a plano-convex cylindrical lens, a plano-concave cylindrical lens, a biconvex cylindrical lens, a biconcave cylindrical lens, a meniscus cylindrical lens, a prism cylindrical lens, or a combination thereof.

[0042] The head-up display system according to claim 1, further comprising a diffusing element.

[0043] The diffusing element is arranged in a stacked manner with the separate diffusing element, and a preset distance is arranged between the diffusing element and the separate light diffusing element.

[0044] The diffusing element diffuses the light emitted by the plurality of light sources.

[0045] In another implementation form of the invention, the preset distance is 40-50 mm.

[0046] In another implementation form of the invention, the diffusing element is a diffractive optical element or a scattering optical element.

[0047] In another implementation form of the invention, the at least two observation areas comprise an observation area corresponding to a driver of the vehicle and an observation area corresponding to a passenger.

[0048] In another implementation form of the invention, the at least two observation areas comprise observation areas corresponding to any at least two passengers in the vehicle.

[0049] Another aspect of the invention provides a motor vehicle comprising the head-up display system according to any one of the above embodiments.

[0050] In the above scheme provided by the embodiments of the invention, the plurality of light sources, the light guiding element, the separate light diffusing element, and the image display layer are arranged, the light guiding element transmits the light emitted by the plurality of light sources, the separate light diffusing element diffuses the light emitted by the light sources into at least two light beams in different directions, each light beam comprises a preset shaped cross section; the image display layer converts and emits image light from the incident light, the image light is reflected on the transflective element, and the reflected light is directed to at least two different observation areas, the observation areas correspond to the diffused light beams one by one, the HUD can observe the image in at least two areas, and the HUD can be applied to multi-person multi-angle viewing, etc., thereby improving the use experience and convenience of the HUD and expanding the application scenarios of the HUD.

[0051] In order to make the above objectives, characteristics and advantages of the invention more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are referred to. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 A schematic diagram showing the structure of a head-up display system according to an embodiment of the application Figure 1 ;

[0053] Figure 2 A schematic diagram showing the structure of a head-up display system according to an embodiment of the application Figure 2 ;

[0054] Figure 3 A schematic diagram showing the structure of a head-up display system according to an embodiment of the application Figure 3 ;

[0055] Figure 4 A schematic diagram showing the structure of a head-up display system according to an embodiment of the application ;

[0056] Figure 5 A schematic diagram showing the structure of a head-up display system according to an embodiment of the application ;

[0057] Figure 6 A schematic diagram showing the structure of a head-up display system according to an embodiment of the application Figure 1 ;

[0058] Figure 7 A schematic diagram showing the structure of a head-up display system according to an embodiment of the application Figure 2 ;

[0059] Figure 8 A schematic diagram showing the structure of a head-up display system according to an embodiment of the application Figure 1 ;

[0060] Figure 9a A schematic diagram showing the structure of a head-up display system according to an embodiment of the application Figure 1 ;

[0061] Figure 9b A schematic diagram showing the structure of a head-up display system according to an embodiment of the application Figure 2 ;

[0062] Figure 10a A schematic diagram showing the structure of a head-up display system according to an embodiment of the application Figure 2 ;

[0063] Figure 10b A schematic diagram showing the structure of a head-up display system according to an embodiment of the application Figure 3 ;

[0064] Figure 11 A schematic diagram showing the structure of a head-up display system according to an embodiment of the application Figure 3 ;

[0065] Figure 12 shows a partial structure of a head-up display system according to an embodiment of the present application Figure 4

[0066] Figure 13 shows a partial structure of a head-up display system according to an embodiment of the present application Figure 3

[0067] Figure 14 shows a partial structure of a head-up display system according to an embodiment of the present application Figure 4

[0068] Figure 15 shows a partial structure of a head-up display system according to an embodiment of the present application Figure 5

[0069] Figure 6 shows a partial structure of a head-up display system according to an embodiment of the present application Figure 7

[0070] Figure 8 shows a partial structure of a head-up display system according to an embodiment of the present application Figure 9

[0071] Figure 1 shows a partial structure of a head-up display system according to an embodiment of the present application Figure 1

[0072] Figure 1 shows a partial structure of a head-up display system according to an embodiment of the present application

[0073] Reference signs: 100 - light source; 200 - light guide element; 300 - split light diffusion element; 400 - image forming element; 500 - trans-reflective element; 600 - collimating element; 700 - diffusing element; 1 - image source; 10 - first observation area; 11 - second observation area; 20 - first virtual image; 21 - second virtual image; 201 - hollow shell; 2011 - end of hollow shell; 2012 - light exit opening of hollow shell; 2013 - first inner reflecting surface; 2014 - second inner reflecting surface; 2015 - third inner reflecting surface; 2016 - fourth inner reflecting surface; 301 - light ray directing layer; 302 - light ray diffusion layer. DETAILED DESCRIPTION

[0074] Further embodiments of the present application will be described below with reference to the drawings.

[0075] ​​​​​​​Following make the specific concrete example explain the embodiment of the application, the person skilled in the art can be easily understood from the disclosure of the present application other advantages and efficacy.The present application can also be implemented or applied by another different embodiment, the details in the specification can be based on different views and applications, without departing from the spirit of the present application, various modifications or changes.The need to explain, in the following examples and the features in the examples can be combined with each other without conflict.

[0076] Need to explain, the drawings provided in the following examples only illustrate the basic concept of the present application in a schematic way, and the drawings only show the components related to the present application, but not drawn according to the number, shape and size of the components in the actual implementation, the actual implementation of each component type, quantity and proportion can be a kind of arbitrary change, and its component layout type can be more complex.

[0077] Need to explain, for the sake of simplicity and intuition, the following describes several representative embodiments to elaborate the scheme of the present application.A large number of details in the embodiment are only used to help understand the scheme of the present application.But it is obvious that the technical scheme of the present application can not be limited to these details.In order to avoid unnecessary confusion of the scheme of the present application, some embodiments are not described in detail, but only the framework is given.In the following, "including" means "including but not limited to", "according to" means "at least according to, but not limited to only according to".The first, the second, etc.are only used to refer to the characteristics, and are not intended to limit the characteristics, such as the order limitation.Because of the language habit of Chinese, when the quantity of a component is not specially pointed out in the following, it means that the component can be one or more, or can be understood as at least one.

[0078] The present embodiment provides a head-up display system, see Figure 1 As shown, comprising: a plurality of light sources 100, light guide element 200, separate light diffusion element 300, image forming element 400;A plurality of light sources 100 along the first direction extends into a light source linear array, a plurality of light sources 100 is configured to generate light by electrical energy;Light guide element 200 is arranged in the light emitting direction of a plurality of light sources 100;The inner reflection surface of light guide element 200 faces a plurality of light sources 100 and forms an internal space allowing light to pass;The light emitted by a plurality of light sources 100 is transmitted to image forming element 400 through light guide element 200;The light emitted by light source 100 is diffused into at least two different direction light beams by separate light diffusion element 300, each light beam includes a preset shape of cross section;Image forming element 400 converts the light emitted by a plurality of light sources 100 into image light.

[0079] Further, the head-up display system in any of the embodiments of the present application can further comprise a transflective element 500, which is arranged on the side of the image forming element 400 away from the plurality of light sources 100, and the image light is reflected on the transflective element 500, and the reflected light is directed to at least two different observation areas; the light guide element 200, the separate light diffusion element 300 and the image forming element 400 are arranged between the plurality of light sources 100 and the transflective element 500.

[0080] In the embodiment, the light source 100 can be a point light source, a line light source or a surface light source, and the number of the light source 100 can be at least two, which is not limited; the light source 100 can be an electroluminescent element, which generates light by electricity, including but not limited to a light emitting diode (LED), an organic light emitting diode (OLED), a mini light emitting diode (Mini LED), a micro light emitting diode (Micro LED), a cold cathode fluorescent lamp (CCFL), a cold LED light (CLL), an electro luminescent (EL), a field emission display (FED) or a quantum dot light source (QD), etc. As shown in the figure, the plurality of light sources 100 are arranged in a light source linear array along a first direction, and the first direction can be any direction, as long as the plurality of light sources 100 are arranged in a linear array; optionally, the plurality of light sources 100 include electroluminescent elements emitting white light, such as white LEDs; and can also include electroluminescent elements emitting different color light, such as blue LEDs, red LEDs or green LEDs, which can be used for color display and other special purposes; and the present application does not limit the spacing between the plurality of light sources. Figure 1

[0081] Generally, the light emitted by the light source 100 has a certain divergence angle, such as the light emitted by the LED light source generally includes a divergence angle (full angle) of 90°, 120° or 150°. The light with a larger divergence angle is difficult to be directed to the image forming element 400, and thus is difficult to be utilized for imaging. The light guide element 200 is arranged on the light emitting direction of the plurality of light sources 100, the inner reflection surface of the light guide element 200 faces the plurality of light sources 100 and forms an internal space allowing light to pass through, and the light emitted by the plurality of light sources 100 is transmitted to the image forming element 400 through the light guide element 200. Figure 1 ​As shown, the inner reflection surface of the light guide element 200 faces the plurality of light sources 100, and the light emitted by the plurality of light sources 100 is transmitted in the internal space of the light guide element 200 to the image forming element 400, and the light with a large divergence angle is reflected on the inner reflection surface of the light guide element 200 and then transmitted to the image forming element 400. By arranging the light guide element 200, the light with a certain divergence angle emitted by the plurality of light sources can be gathered, and as many light rays as possible can be finally used for imaging, thereby improving the utilization rate of light.

[0082] The separate light diffusion element 300 is arranged to diffuse the light emitted by the plurality of light sources 100 into at least two light beams in different directions, and each light beam includes a preset cross section. The cross section refers to the cross section along the chief ray of the light beam, and the preset shape includes but is not limited to linear, triangular, rectangular, square, circular, elliptical, trapezoidal or parallelogram. In this embodiment, the separate light diffusion element 300 diffuses the light emitted by the plurality of light sources 100, which includes the light directly emitted by the plurality of light sources 100 and / or the light indirectly emitted by the plurality of light sources 100. The light directly emitted by the plurality of light sources 100 specifically refers to the light emitted by the plurality of light sources 100 without passing through other elements. The light indirectly emitted by the plurality of light sources 100 specifically refers to the light emitted by the plurality of light sources 100, which passes through other elements and then exits to the separate light diffusion element 300. As shown, Figure 1 As shown, for the separate light diffusion element 300, the light emitted by the plurality of light sources 100 is transmitted through the light guide element and then reaches the separate light diffusion element 300, so that the light is diffused by the separate light diffusion element 300. Figure 1 In the corresponding embodiment, the separate light diffusion element 300 diffuses the light indirectly emitted by the plurality of light sources 100 and forms at least two light beams in different directions. Figure 1 In this embodiment, the light emitted by the plurality of light sources 100 is taken as an example to illustrate that the light is diffused by the separate light diffusion element 300 to form two light beams. In the figure, CRA and CRB represent the chief rays of the two light beams formed after diffusion, respectively. The chief ray specifically refers to the center of the light beam energy distribution, which points to the direction with the maximum light intensity of the light beam. The direction of the chief ray can also be the direction of the symmetry axis of the light intensity distribution of the light beam, which is generally the central axis direction of the light beam. The direction of the chief ray represents the main direction of the light propagation of the light beam. The light intensity of the light in the direction of the chief ray and the light close to the direction of the chief ray is greater than the light intensity of the light in other directions, that is, the chief ray of the light beam can represent the propagation and direction change of the light beam as a whole. By arranging the separate light diffusion element 300, the light emitted by the plurality of light sources 100 can be emitted to at least two different directions, and the head-up display system can be viewed in at least two different directions to realize the multi-view application of the head-up display system.

[0083] The image forming element 400 converts the light rays emitted by the plurality of light sources 100 into image light rays, as shown in FIG. 4B. Figure 1 As shown in FIG. 4B, the two light beams diffused by the split light diffusion element 300 pass through the image forming element 400, which converts the light rays of the light beams into image light rays and emits the image light rays. After passing through the image forming element 400, the light rays form an image on the surface of the image forming element 400, i.e., the light rays emitted by the image forming element 400 are image light rays including image information. The image forming element 400 hardly changes the directions of the principal axes of the light beams, so the image light rays formed by the two light beams passing through the image forming element 400 also include image light beam pointing in two directions, and the principal axes of the two image light beams are still CRA and CRB. In this embodiment, the image forming element 400 converts the light rays emitted by the plurality of light sources 100 into image light rays, including light rays directly emitted by the plurality of light sources 100 and / or light rays indirectly emitted by the plurality of light sources 100. The light rays directly emitted by the plurality of light sources 100 are specifically light rays emitted by the plurality of light sources 100 without passing through other elements. The light rays indirectly emitted by the plurality of light sources 100 are specifically light rays emitted by the plurality of light sources 100, which pass through other elements and are then emitted to the split light diffusion element 300. Figure 1 As shown in FIG. 4B, for the image forming element 400, the light rays emitted by the plurality of light sources 100 pass through the light guide element, are transmitted to the split light diffusion element 300, and then reach the image forming element 400, so the image forming element 400 receives the light rays emitted by the plurality of light sources 100. Figure 2 In the corresponding embodiment, the image forming element 400 converts the light rays indirectly emitted by the plurality of light sources 100 into image light rays. By setting the image forming element 400 to convert the light rays emitted by the plurality of light sources 100 into image light rays, the head-up display system can display image information such as text, pictures, or videos, and the observer can see the images.

[0084] The transreflective element 500 is arranged on the side of the image forming element 400 away from the plurality of light sources 100, and the image light rays are reflected on the transreflective element 500, and the reflected light rays are emitted to at least two different observation areas. Specifically, as shown in FIG. 4B, the transreflective element 500 is arranged on the side of the image forming element 400 away from the plurality of light sources 100, and the image light rays are reflected on the transreflective element 500, and the reflected light rays are emitted to at least two different observation areas. Figure 1As shown, the two image light beams are reflected on the transflector 500, and the reflected light beams are directed to the first observation area 10 and the second observation area 11, that is, the two different light beams correspond to the observation areas one-to-one, so that the observers whose eyes are located at the first observation area 10 and the second observation area 11 can see the corresponding first virtual image 20 and second virtual image 21, respectively. The first virtual image 20 and the second virtual image 21 are virtual images formed by the two different image light beams in the form of reflection imaging after passing through the transflector 500. Preferably, the cross sections of the two light beams in the observation areas are separated from each other. At the same time, the light from the external environment is transmitted through the transflector 500 to the first observation area 10 and the second observation area 11. Specifically, the transflector 500 can be a windshield of a vehicle, the external environment can be the environment outside the windshield of the vehicle, and the observation area can be the observation area of an observer, such as a passenger or a driver, inside the windshield of the vehicle. The driver and the passenger can both see the image of the HUD, realize multi-angle viewing, and also observe the situation outside the vehicle without affecting normal driving. Specifically, the first observation area 10 and the second observation area 11 can be respectively arranged as the eyebox regions of the passenger and the driver. The eyebox region refers to the region where the eyes of the observer are located and where the observer can see the image of the HUD. At this time, only the above two light beams need to cover the eyebox regions of the driver and the passenger, respectively. The eyebox regions of the driver and the passenger do not coincide, and the cross sections of the two light beams in the eyebox regions are also separated and do not coincide. Preferably, the shapes of the cross sections of the two light beams at the first observation area 10 and the second observation area 11 are the same as the shape of the eyebox region, the cross section size of the light beam is close to the eyebox region of the driver and the passenger, and the eyebox region is just covered, which can further improve the light efficiency. In the embodiment, the first observation area 10 and the second observation area 11 each have a certain size. Even if the eyes of the observer move a certain distance, such as up and down or left and right, as long as the eyes of the observer are still in the observation area, the observer can still see the image of the HUD. When the transflector 500 is removed, the image light beams are directly directed to at least two different regions, which are specifically the mirror positions of the different observation areas relative to the transflector 500. At this time, the eyes of different observers in the above at least two different regions can directly see the image formed on the surface of the image forming element 400, that is, at least two observers can directly view the image formed on the surface of the image forming element 400 in at least two different regions. Those skilled in the art should understand that, in order to distinguish the first virtual image 20 and the second virtual image 21, Figure 2 and Figure 1 there is a certain distance between the first virtual image 20 and the second virtual image 21 in the embodiment, but the first virtual image 20 and the second virtual image 21 do not have a distance difference in the side view. The first virtual image 20 and the second virtual image 21 can have a certain distance in the side direction, or can have no distance.

[0085] The light guide element 200, the separate light diffusion element 300 and the image forming element 400 are arranged between the plurality of light sources 100 and the transflector 500. Specifically, as shown in FIG. 2, the light guide element 200, the separate light diffusion element 300 and the image forming element 400 are arranged in sequence between the plurality of light sources 100 and the transflector 500; or, as shown in FIG. 3, the light guide element 200, the image forming element 400 and the separate light diffusion element 300 are arranged in sequence between the plurality of light sources 100 and the transflector 500. Figure 2 Figure 1 The light guide element 200, the image forming element 400 and the separate light diffusion element 300 are arranged in sequence between the plurality of light sources 100 and the transflector 500. The light emitted by the plurality of light sources 100 is transmitted through the light guide element 200, and then first passes through the image forming element 400 to form image light. The image light then passes through the separate light diffusion element 300 and is diffused into two different light beams. The image light can be considered as light indirectly emitted by the plurality of light sources 100. The two different light beams are reflected by the transflector 500 to the different first observation area 10 and second observation area 11 in a process similar to the above process, which will not be described here.

[0086] Those skilled in the art should understand that, Figure 2 Figure 3 FIG. 4 is a schematic view of the head-up display system of the present embodiment applied to a vehicle. In the figure, the x direction represents the direction of travel of the vehicle. It can be understood that the two different observation areas, the first observation area 10 and the second observation area 11, can be distributed in the vertical direction (i.e., the z direction perpendicular to the xy plane of the vehicle) or in the horizontal direction (i.e., the y direction of the xy plane of the vehicle). Preferably, the first observation area 10 and the second observation area 11 are distributed in the horizontal direction, corresponding to the eye box regions of the driver and the passenger, respectively. Figure 3 Figure 4 In the corresponding embodiment, the separate light diffusion element 300 can also diffuse more light beams to correspond to more observation areas, and the implementation process is similar to the above process, which will not be listed and described here.

[0087] Figure 4 FIG. 5 shows a schematic view of another perspective of the head-up display system of the present embodiment. For convenience of explanation, the head-up display system in the present embodiment, excluding the transflector 500, can constitute an image source 1. The image source 1 emits image light, and the image source 1 is used instead of the plurality of light sources 100, the light guide element 200, the separate light diffusion element 300 and the image forming element 400 for explanation. Figure 4 ​​​A smaller display area AB of the image source 1 is taken as an example for illustration. The solid arrows in the figure represent the principal axes CRA and CRB of the two light beams emitted by different pixel points in the display area AB. The two light beams emitted by different pixel points are reflected by the transflector 500 along the principal axes CRA and CRB, and the reflected light is directed to the first observation area 10 and the second observation area 11, respectively. Different observers can see the first virtual image 20 and the second virtual image 21 in the first observation area 10 and the second observation area 11, respectively. The first virtual image 20 and the second virtual image 21 are formed outside the transflector 500. For convenience of illustration, the transflector 500 is taken as a plane in the embodiments and the accompanying drawings. In actual applications, the transflector 500 can be a curved surface with an arc, such as a windshield. The reflection imaging principle is similar to the above process, which is not described herein. It should be understood by those skilled in the art that the position of the virtual image is not fixed when the curved transflector 500 is observed at different positions. Therefore, when the transflector 500 is a windshield or an imaging window with an arc, the virtual image in the embodiments refers to the virtual image observed from each observation area, i.e., the position of the virtual image is the position of the virtual image observed by different observers from each observation area.

[0088] When the head-up display system is installed on a vehicle or other transportation tool, the transflector 500 in the embodiments can be a windshield of the vehicle, or a transflector film attached to the windshield, or an imaging window formed of a transparent material, including a transparent resin, a high-molecular transparent material, or glass, such as an imaging window of a combiner-HUD (C-HUD). Different observation areas correspond to eye-box regions of different observers in the transportation tool, such as the eye-box regions of the driver and the passenger. The driver or the passenger can not only observe the virtual image formed by reflection, but also can normally view the scene outside the vehicle through the transflector 500 and reach the observation area of the driver or the passenger. The image source 1 in the embodiments can be arranged below the windshield or on the surface of the console of the vehicle. Further, the image source 1 can be arranged in a large area, and the light emitted by the image source 1 can form a large-size image after being reflected by the transflector 500, thereby further improving the use experience of the head-up display system.

[0089] In the embodiment, the light rays emitted by the plurality of light sources 100 are converged by the light guide elements 200, the light rays emitted by the plurality of light sources 100 are diffused into at least two different light beams by the split light diffusion element 300, and the light rays are converted into image light rays by the image forming element 400, the image light rays are reflected on the transflector 500 to form an image, and the reflected light rays are directed to at least two different observation areas, so that different observers such as the driver and the passenger can see the image of the HUD, multi-angle observation is achieved, the convenience of using the HUD is improved, and the use experience of the HUD is improved.

[0090] On the basis of the above-mentioned embodiments of the present application, the head-up display system comprises a plurality of light source linear arrays arranged along a second direction, and a plurality of light guide elements 200 are arranged one by one in the light emitting direction of the corresponding light source linear array. Figures 5-7 As shown in the top view of the plurality of light guide elements 200 and the corresponding light source linear arrays, Figure 5 As shown in the top view of the plurality of light guide elements 200 and the corresponding light source linear arrays, Figures 5-7 In the second direction, the second direction can be a vertical direction and / or a horizontal direction; optionally, the plurality of light source linear arrays can also be arranged along a second direction having an angle with the horizontal / vertical direction, which is not limited in the embodiment. In the embodiment, the number of light sources 100 is increased by arranging a plurality of light guide elements 200 and a plurality of corresponding light source linear arrays, the light rays are uniformly distributed in the plane, the light intensity is increased, and the imaging brightness of the head-up display system is further improved.

[0091] On the basis of the above-mentioned embodiments of the present application, the light guide element 200 comprises a hollow shell 201 provided with an inner reflection surface. As shown in the top view of the plurality of light guide elements 200 and the corresponding light source linear arrays, Figure 5 As shown in the top view of the plurality of light guide elements 200 and the corresponding light source linear arrays, Figure 6 As shown in the top view of the plurality of light guide elements 200 and the corresponding light source linear arrays, Figures 5-7The hollow shell 201 is taken as an example of the inner reflection surface being a plane for explanation and illustration. It can be understood that the shape of the hollow shell 201 can be different from the shape of the inner reflection surface, as long as the inner reflection surface is the shape that can reflect light as described above. In the embodiment of the present application, the shape of the hollow shell 201 is consistent with the shape of the inner reflection surface for the convenience of illustration.

[0092] Further, the light outlet opening 2012 of the hollow shell 201 is directed towards the image forming element 400, and the end portion 2011 of the hollow shell 201 is provided with a plurality of light sources 100, and the extension direction of the end portion 2011 of the hollow shell 201 is the first direction in which the plurality of light sources 100 are arranged, as shown in Figure 2 Figure 1 A view of the hollow shell 201 in the visual angle along the first direction is shown, and it can be seen that the light emitted by the plurality of light sources 100 is transmitted in the internal space of the hollow shell 201 and reflected on the inner reflection surface, and is transmitted to the image forming element 400. Figure 5 A schematic diagram of the transmission of the light emitted by the plurality of light sources 100 through the hollow shell 201 in the shape of a four-pronged ladder is shown, the light outlet opening 2012 of the hollow shell 201 is directed towards the image forming element 400, and part of the light emitted by the plurality of light sources 100 is transmitted and emitted in the transmission channel of the hollow shell 201, and another part of the light with a larger angle is reflected on the inner reflection surface of the hollow shell 201 and emitted; the light transmitted through the hollow shell 201 is transmitted to the image forming layer 400, which can be directly transmitted to the image forming layer 400, as shown in Figure 6 ; or can be indirectly transmitted to the image forming layer 400, as shown in Figure 7 ; the light can first pass through the split light diffusion element 300 and then be transmitted to the image forming layer 400, which can all be regarded as the light emitted by the plurality of light sources 100 being transmitted to the image forming layer 400 through the internal space of the hollow shell 201. It should be understood by those skilled in the art that Figures 5-7 and Figures 5-7 The hollow shell 201 in the corresponding embodiment is in a similar symmetrical shape in the figure, but the embodiment of the present application and the corresponding drawings do not limit the hollow shell 201 or other similar elements to be symmetrical shapes. Figure 5 A view of the hollow shell 201 extending along the first direction is shown, and the hollow shell 201 is in an asymmetrical shape, which can be used to adjust the direction of the light so that the light passing through the light outlet opening 2012 has a certain orientation, and cooperates with other elements to direct the light to the eyebox.

[0093] Further, in a preferred embodiment of the present embodiment, the hollow shell 201 comprises a first inner reflection surface 2013 and a second inner reflection surface 2014 arranged oppositely; the first inner reflection surface 2013 and the second inner reflection surface 2014 extend along the first direction. As shown in Figure 8 ​As shown, the hollow shell 201 comprises a quadrangular trapezoidal shape, specifically comprises a first inner reflecting surface 2013 and a second inner reflecting surface 2014 extending along a first direction, and the light emitted by the plurality of light sources 100 is reflected on the first inner reflecting surface 2013 and the second inner reflecting surface 2014 and is converged.

[0094] Further, the hollow shell 201 further comprises a third inner reflecting surface 2015 and a fourth inner reflecting surface 2016 oppositely arranged, the third inner reflecting surface 2015 is connected with the first inner reflecting surface 2013 and the second inner reflecting surface 2014 respectively, and the fourth inner reflecting surface 2016 is connected with the first inner reflecting surface 2013 and the second inner reflecting surface 2014 respectively. Figure 9a As shown, the third inner reflecting surface 2015 and the fourth inner reflecting surface 2016 are arranged at two ends of the hollow shell 201. It can be understood that most of the light emitted by the plurality of light sources 100 with a large divergence angle will be reflected on the first inner reflecting surface 2013 and the second inner reflecting surface 2014 and converged, thereby improving the light utilization rate; for the third inner reflecting surface 2015 and the fourth inner reflecting surface 2016, only the light with a large angle emitted by the light source 100 close to the two inner reflecting surfaces will be reflected, and the light with a large angle emitted by other light sources 100 far away from the third inner reflecting surface 2015 and the fourth inner reflecting surface 2016 is difficult to reach the third inner reflecting surface 2015 and the fourth inner reflecting surface 2016 to be reflected, so the third inner reflecting surface 2015 and the fourth inner reflecting surface 2016 have limited convergence effect on the light, and in actual application, the third inner reflecting surface 2015 and the fourth inner reflecting surface 2016 can only retain a small part close to the light source. Optionally, the shape of the above-mentioned plurality of inner reflecting surfaces comprises a plane, a curved surface, an arc surface or a parabolic surface, which is not limited in the embodiment.

[0095] Further, the length of the first inner reflecting surface 2013 and the second inner reflecting surface 2014 extending along the first direction is greater than the length of the part where the third inner reflecting surface 2015 connects with the first inner reflecting surface 2013 and the second inner reflecting surface 2014; and / or the length of the first inner reflecting surface 2013 and the second inner reflecting surface 2014 extending along the first direction is greater than the length of the part where the fourth inner reflecting surface 2016 connects with the first inner reflecting surface 2013 and the second inner reflecting surface 2014. Figure 9bAs shown, the length of the first inner reflecting surface 2013 and the second inner reflecting surface 2014 extending along the first direction is marked in the figure, which is marked by double-headed arrows on each reflecting surface; the length of the part where the third inner reflecting surface 2015 connects with the first inner reflecting surface 2013 and the second inner reflecting surface 2014, and the length of the part where the fourth inner reflecting surface 2016 connects with the first inner reflecting surface 2013 and the second inner reflecting surface 2014 are also marked in the figure, which is marked by double-headed arrows on each reflecting surface. It can be understood that, in order to reflect and concentrate as many light rays with large divergence angles emitted by the plurality of light sources 100 as possible, the first inner reflecting surface 2013 and the second inner reflecting surface 2014 are close to the plurality of light sources 100, and the plurality of light sources 100 are arranged as a linear light source, so the extension length of the third inner reflecting surface 2015 and / or the fourth inner reflecting surface 2016 at both ends is preferably less than the extension length of the first inner reflecting surface 2013 and the second inner reflecting surface 2014.

[0096] In this embodiment, by arranging the hollow shell 201, the light rays with large angles emitted by the plurality of light sources 100 that are difficult to reach the image forming layer 400 are reflected on the inner reflecting surface of the hollow shell 201, and the angles of the reflected light rays are changed and concentrated, which can improve the utilization rate of the light rays emitted by the plurality of light sources 100, and further improve the light efficiency of the head-up display system.

[0097] On the basis of the above-mentioned embodiments of the present application, optionally, the image forming element comprises a liquid crystal display panel. Specifically, the liquid crystal display panel comprises a first polarization control element, a liquid crystal layer and a second polarization control element, the first polarization control element transmits light of a first polarization characteristic, and the second polarization control element transmits light of a second polarization characteristic; the polarization directions of the light of the first polarization characteristic and the light of the second polarization characteristic are orthogonal. Specifically, the liquid crystal layer comprises a twisted nematic (TN) liquid crystal, a high twisted nematic (HTN) liquid crystal, a super twisted nematic (STN) liquid crystal, a formated super twisted nematic (FSTN) liquid crystal or a blue phase liquid crystal, etc. The polarization directions of the light of the first polarization characteristic and the light of the second polarization characteristic are orthogonal, and the polarization state can specifically include linear polarization, elliptical polarization, circular polarization, etc. Specifically, the light of the first polarization characteristic is horizontal linearly polarized light, and the light of the second polarization characteristic is vertical linearly polarized light; or the light of the first polarization characteristic is vertical linearly polarized light, and the light of the second polarization characteristic is horizontal linearly polarized light; or the light of the first polarization characteristic is left-handed circularly polarized light, and the light of the second polarization characteristic is right-handed circularly polarized light; or the light of the first polarization characteristic is right-handed circularly polarized light, and the light of the second polarization characteristic is left-handed circularly polarized light; or the light of the first polarization characteristic is left-handed elliptical polarized light, and the light of the second polarization characteristic is right-handed elliptical polarized light; or the light of the first polarization characteristic is right-handed elliptical polarized light, and the light of the second polarization characteristic is left-handed elliptical polarized light.

[0098] On the basis of the above-mentioned embodiments of the present application, the separation type light diffusion element 300 comprises a light direction layer 301 and a light diffusion layer 302, the light direction layer 301 emits light emitted by the plurality of light sources 100 in at least two different directions; the light diffusion layer 302 diffuses the light emitted in at least two different directions into at least two light beams, the light direction layer 301 is towards the plurality of light sources 100, the light diffusion layer 302 is arranged on the side of the light direction layer 301 away from the plurality of light sources 100, the light emitted directly or indirectly by the plurality of light sources 100 first passes through the light direction layer 301, the light is emitted in at least two different directions, and then diffused into at least two light beams by the light diffusion layer 302, as shown in Figure 8 .

[0099] Specifically, the light direction layer 301 comprises a plurality of micro-prism structures, as shown in Figure 10a , Figure 10bAs shown, the micro-prism structure includes triangular cross-sectioned triangular prism structures, which refract light rays to at least two different directions by the refractive effect of the micro-prism, and the material of the micro-prism is transparent material with a refractive index greater than 1, including but not limited to Polymethyl Methacrylate (PMMA), Polycarbonate (PC), or glass, etc.; preferably, the height of the micro-prism structure is 50-200 μm, the length of the base of the micro-prism structure is 50-300 μm, and the included angle between adjacent micro-prism structures is 60-120°.

[0100] The light diffusion layer 302 includes an element capable of diffusing light into a light beam including a preset shape cross-section, such as a Diffractive Optical Element (DOE), which can diffuse light into a light beam including a preset shape cross-section by controlling the microstructure of the diffractive optical element, and the preset shape includes but is not limited to linear, triangular, rectangular, square, circular, elliptical, trapezoidal, or parallelogram; the dispersion angle of each light beam after diffusion in the horizontal and vertical directions can also be accurately controlled, and the dispersion angle can be specifically 5°-30°, the larger the dispersion angle, the higher the light dispersion degree, and the lower the final imaging brightness, and vice versa; the dispersion angle specifically refers to the included angle between the two light rays deviating from the principal axis with the largest angle. Specifically, the diffractive optical element includes a Beam Shaper.

[0101] Optionally, the cross-sectional preset shapes of the at least two light beams can be the same or different, such as Figure 9a The split light diffusion element in the middle diffuses light into two light beams with circular cross-sectional shapes, and can also diffuse light into a light beam with a preset rectangular cross-sectional shape and a light beam with a preset circular cross-sectional shape; the diffusion angles of the at least two light beams can also be the same or different, the light intensity in the final observation area can also be the same or different, and the brightness of the final image can also be the same or different.

[0102] Figure 11 The light path schematic diagram of the light emitted directly or indirectly by the multiple light sources 100 incident by the light directional layer 301 is shown, and the light is taken as an example of being split into two light beams for explanation and description. The light first enters the micro-prism structure of the light directional layer 301, and because of the refractive effect of the micro-prism structure, the principal axes CRA and CRB of the two emergent light beams are refracted to two different directions, which is achieved by adjusting the refractive index of the micro-prism structure and the angle of the micro-prism structure, and a smaller micro-prism angle (the prism angle refers to the internal angle of the prism) or a larger refractive index will result in a larger light refraction angle, and when the light refraction angle is greater than a certain critical value, the principal axes CRA and CRB of the emergent light beams point to different directions; specifically, the refractive index of the micro-prism structure is in the range of 1.45 to 1.6.Figure 12 This diagram illustrates the optical path of light emitted directly or indirectly from multiple light sources 100 when incident through the light diffusion layer 302. It can be seen that when light with a small incident angle and close to the vertical direction reaches the light directional layer 301 and exits, it undergoes total internal reflection because the light directional layer 301 is an optically denser medium relative to air. After two total internal reflections, the light returns to the side where it was incident and does not exit. Light with a large incident angle refracts out of the light directional layer. The refraction angle of the principal optical axis CRA of the outgoing beam is small, and the principal optical axis exits in one direction, not in at least two directions. When light emitted directly or indirectly from multiple light sources 100 is incident through the light diffusion layer 302, only large-angle light can exit and form a single beam. That is, the light diffusion layer 302 is disposed on the side of the light orientation layer 301 away from the light source, and the side of the split light diffusion element 300 with the microprism structure faces the multiple light sources 100. The light emitted directly or indirectly by the multiple light sources 100 will be diffused into at least two beams with different directions and including a preset cross-section after passing through the split light diffusion element. It should be understood that Figures 13-15 For ease of illustration, the light-directing layer 301 is aligned with multiple light sources 100. Both the light-directing layer 301 and the light-diffusing layer 302 are enlarged and do not represent the actual proportions and sizes.

[0103] Optional, such as Figures 13-15 , Figures 13-15 As shown, the microprism structure also includes paired prism structures with right-angled triangular cross sections and prism structures with right-angled trapezoidal cross sections. The principle of directional light emission is similar to that of the triangular prism structure, and will not be elaborated here.

[0104] Based on the above embodiments of the present invention, the head-up display system further includes a collimation element 600. Specifically, the collimation element 600 is disposed between the plurality of light sources 100 and the image forming element 400, and the collimation element 600 adjusts the light emitted by the plurality of light sources 100 into parallel light rays. See also Figure 14 As shown, the collimating element 600 is disposed between the plurality of light sources 100 and the image forming element 400. The light emitted by the plurality of light sources 100 is adjusted into parallel or nearly parallel light rays after passing through the collimating element 600. Optionally, the collimating element 600 can be a collimating lens or a collimating film. Figure 13The collimating lens is illustrated below. Collimating lenses include one or more of the following: plano-convex cylindrical lenses, plano-concave cylindrical lenses, biconvex cylindrical lenses, biconcave cylindrical lenses, meniscus cylindrical lenses, intergrowth cylindrical lenses, or combinations thereof. Specifically, the collimating element 600 can be a plano-convex cylindrical lens, in which case the multiple light sources 100 can be positioned at the focal length of the cylindrical lens, i.e., the distance between the cylindrical lens and the multiple light sources 100 is the focal length of the cylindrical lens, so that light rays emitted from the multiple light sources 100 in different directions can be emitted in parallel after passing through the collimating element 600. Specifically, the first direction in which the multiple light sources 100 are arranged is parallel to the axial meridional direction of the cylindrical lens. Alternatively, the collimating element 600 can be a collimating film, such as a BEF (Brightness Enhancement Film), used to adjust the outgoing direction of light to a preset angle range, for example, focusing the light within an angle range of ±35° of the collimating film normal.

[0105] Specifically, when the collimating element 600 is a collimating lens, the collimating element 600 can be disposed inside the hollow housing 201, and the size of the collimating element 600 is smaller than the size of the light-emitting opening of the hollow housing 201, such as... Figure 13 As shown, Figure 15 for Figures 16-18 The corresponding embodiment is a view extending along the first direction; the collimating element 600 collimates a portion of the light transmitted within the hollow housing 201 before emitting it to the image forming element 400. Specifically, this portion of the light is the central light emitted from multiple light sources 100 at a small angle, which is transformed into parallel or nearly parallel light after passing through the collimating element 600. The collimating element 600 collimates a portion of the light emitted from the multiple light sources 100, which has a small exit angle; while the light emitted from the multiple light sources 100 at a larger exit angle is reflected and converged by the inner reflective surface of the hollow housing 201. Thus, by combining the collimating element 600 and the hollow housing 201, the light emitted from the multiple light sources 100 can be more effectively converged and collimated, further improving light utilization. It can be understood that the collimated light can be emitted perpendicularly and parallel, such as... Figure 17 As shown; alternatively, the collimating lens can be tilted or offset, and the collimated light rays will still be parallel, but will exit parallel at a certain tilt angle, such as... Figure 16 As shown in the figure, the hollow shell 201, collimating element, etc. in this embodiment and the accompanying drawings can be symmetrical or asymmetrical, and this embodiment does not limit them.

[0106] The collimating element 600 can also be larger than or equal to the size of the light-emitting opening 2012. The collimating element 600 is disposed on the outside of the hollow housing 201, such as... Figure 16 As shown, Figure 18 yes Figure 19The view of the corresponding embodiment along the first direction. The collimating element 600 covers almost all the light rays emitted by the plurality of light sources 100, and collimates the light rays, which can be vertically parallel out of the collimating lens as shown in Figures 1-3 ; the collimating lens can also be placed obliquely or deviated, and the collimated light rays are still parallel light rays, but are parallel out of the collimating lens with a certain inclination angle as shown in ​ ; the hollow shell 201, the collimating element, etc. in the embodiment and the drawings can also be symmetrical or asymmetrical, which is not limited in the embodiment.

[0107] In the embodiment, the collimating element 600 is arranged to collimate the light rays emitted by the plurality of light sources 100, and the collimated parallel light rays have a small divergence angle and good light ray consistency when transmitted to the image forming element 400, and the light rays are efficiently incident on the image forming element 400, so that the conversion efficiency of the image forming element 400 to the image light rays is improved, and the light efficiency of the head-up display system is improved.

[0108] On the basis of the above-mentioned embodiments of the application, the head-up display system further comprises a dispersing element 700, which disperses the light rays emitted by the plurality of light sources 100; the dispersing element 700 and the separate light diffusion element 300 are stacked, and the dispersing element 700 and the separate light diffusion element 300 are spaced apart by a preset distance. Specifically, the dispersing element 700 can directly or indirectly disperse the light rays emitted by the plurality of light sources 100, and can further uniformly disperse the light rays to make the imaging brightness more uniform. The dispersing element 700 specifically disperses the light rays into light beams, and can be a diffractive optical element (DOE), such as a beam shaper, etc. The specific structure of the diffractive optical element can be referred to the above-mentioned description of the separate light diffusion element, which is not repeated here. Alternatively, the dispersing element 700 can be a scattering optical element, such as a homogenizing sheet, a diffusion sheet, etc., which mainly disperses the light rays through scattering.

[0109] At the same time, in order to ensure that the dispersing element 700 can play a corresponding role, the dispersing element 700 and the separate light diffusion element 300 are spaced apart by a preset distance, which can be 40-50 mm. In addition, the dispersing element 700 and the separate light diffusion element 300 in the embodiment can be arranged on both sides of the image forming element 400 as shown in ​As shown, the dispersion element 700 and the separate light diffusion element 300 can also be arranged on the same side of the image forming element 400, and the light emitted directly or indirectly by the plurality of light sources 100 can first pass through the dispersion element 700 and then pass through the separate light diffusion element 300, or the light emitted directly or indirectly by the plurality of light sources 100 can first pass through the separate light diffusion element 300 and then pass through the dispersion element 700, and the present embodiment is not limited in this regard.

[0110] In the present embodiment, the dispersion element 700 and the separate light diffusion element 300 arranged at intervals can further uniformly diffuse the light while diffusing the light in a directional manner, thereby ensuring the uniformity of the imaging brightness of the head-up display system.

[0111] On the basis of the above-mentioned embodiments of the present application, the at least two observation regions include an observation region corresponding to the driver of the vehicle and an observation region corresponding to the passenger, such as ​ As shown, the at least two observation regions include a second observation region 11 corresponding to the eye box region of the driver and a first observation region 10 corresponding to the eye box region of the co-pilot passenger, or the at least two observation regions include observation regions corresponding to any at least two eye box regions of the passengers in the vehicle, such as observation regions corresponding to the eye box region of the co-pilot passenger and the eye box region of the rear passengers, respectively, or observation regions corresponding to the eye box regions of the plurality of passengers in the rear seat, respectively, and the observation regions corresponding to the different passengers in the vehicle can be set, thereby further improving the use experience and convenience of the HUD.

[0112] Another embodiment of the present disclosure provides a motor vehicle including the display device according to any one of the above-mentioned embodiments. The motor vehicle provided by the embodiment of the present disclosure adopts the display device, so that the driver can directly see more abundant information, such as a large-size navigation map and complex safety information, without looking down at the instrument panel during driving, and thus the demand of the driver for controlling various types of information during driving of the vehicle can be better met.

[0113] The above-mentioned preferred embodiments of the present application should be noted: for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A heads-up display system, characterized by, The head-up display system comprises: a plurality of light sources, a light guide element, a separate light diffusion element, and an image forming element; the plurality of light sources are arranged in a light source linear array along a first direction, and the plurality of light sources are configured to generate light by electrical energy; the light guide element is arranged in a light emitting direction of the plurality of light sources; an inner reflection surface of the light guide element faces the plurality of light sources and forms an internal space allowing light to pass through; the light emitted by the plurality of light sources is transmitted to the image forming element through the internal space formed by the light guide element; the separate light diffusion element diffuses the light emitted by the plurality of light sources into at least two different direction light beams, each of the light beams comprising a preset shape cross section; the separate light diffusion element comprises a light direction layer and a light diffusion layer; the light direction layer emits the light emitted by the plurality of light sources in the at least two different directions; the light diffusion layer diffuses the light emitted in the at least two different directions into at least two light beams; the light direction layer faces the plurality of light sources, and the light diffusion layer is arranged on a side of the light direction layer away from the plurality of light sources; the image forming element converts the light emitted by the plurality of light sources into image light; the head-up display system further comprises a transflective element; the transflective element is a windshield of a vehicle; the light guide element, the separate light diffusion element, and the image forming element are sequentially arranged between the plurality of light sources and the transflective element; the transflective element is arranged on a side of the image forming element away from the plurality of light sources, and the image light is reflected on the transflective element, and the reflected light is directed to at least two different observation areas; wherein the at least two different direction light beams correspond to the at least two different observation areas one-to-one, and the at least two different observation areas correspond to eye box areas of different observers in the vehicle, and the eye box areas of the different observers in the vehicle do not overlap.

2. The head-up display system of claim 1, wherein, The head-up display system comprises a plurality of light source linear arrays arranged along a second direction; a plurality of light guide elements are arranged one-to-one in a light emitting direction of the light source linear arrays corresponding thereto.

3. The head-up display system of claim 1, wherein, The light guide element comprises a hollow shell provided with an inner reflection surface; the hollow shell comprises an end portion for arranging the plurality of light sources and a light emitting opening away from the end portion; the size of the light emitting opening is greater than the size of the end portion.

4. The head-up display system of claim 3, wherein, The light emitting opening of the hollow shell faces the image forming element; the light emitted by the plurality of light sources is transmitted through the internal space of the hollow shell and reflected on the inner reflection surface, and the reflected light is transmitted to the image forming element through the light emitting opening.

5. The head-up display system of claim 3, wherein, The hollow shell comprises a first inner reflection surface and a second inner reflection surface arranged oppositely; the first inner reflection surface and the second inner reflection surface extend along the first direction.

6. The head-up display system of claim 5, wherein, The hollow shell further comprises a third inner reflection surface and a fourth inner reflection surface arranged oppositely; the third inner reflection surface is connected to the first inner reflection surface and the second inner reflection surface respectively, and the fourth inner reflection surface is connected to the first inner reflection surface and the second inner reflection surface respectively.

7. The head-up display system of claim 6, wherein, The length of the first inner reflection surface and the second inner reflection surface extending along the first direction is greater than the length of the third inner reflection surface and the first inner reflection surface and the second inner reflection surface. The length of the first inner reflection surface and the second inner reflection surface extending along the first direction is greater than the length of the fourth inner reflection surface and the first inner reflection surface and the second inner reflection surface.

8. The head-up display system of claim 5, wherein, The inner reflection surface of the hollow housing comprises a planar surface shape or a curved surface shape.

9. The head-up display system of claim 1, wherein, The image forming element comprises a liquid crystal display panel.

10. The head-up display system of claim 3, wherein, The head-up display system further comprises a collimating element. The collimating element is disposed between the plurality of light sources and the image forming element. The collimating element adjusts the light rays emitted by the plurality of light sources into parallel light rays.

11. The head-up display system of claim 10, wherein, The collimating element is disposed inside the hollow housing, and the size of the collimating element is less than the size of the light exit opening of the hollow housing.

12. The head-up display system of claim 10, wherein, The collimating element is disposed outside the light exit opening of the hollow housing, and the size of the collimating element is greater than or equal to the size of the light exit opening of the hollow housing.

13. The head-up display system of claim 10, wherein, The collimating element comprises at least one of a collimating lens or a collimating film.

14. The head-up display system of claim 13, wherein, The collimating lens comprises one or more of a plano-convex cylindrical lens, a plano-concave cylindrical lens, a biconvex cylindrical lens, a biconcave cylindrical lens, a meniscus cylindrical lens, a prism cylindrical lens, or a combination thereof.

15. The head-up display system of claim 1, wherein, The head-up display system further comprises a diffusing element. The diffusing element is disposed in a stacked manner with the separate light diffusion element, and a preset distance is provided between the diffusing element and the separate light diffusion element. The diffusing element diffuses the light rays emitted by the plurality of light sources.

16. The head-up display system of claim 15, wherein, The preset distance is 40-50 mm. The diffusing element is a diffractive optical element or a scattering optical element.

17. The head-up display system of claim 15, wherein, The at least two observation regions comprise an observation region corresponding to a driver of the vehicle and an observation region corresponding to a passenger.

18. The head-up display system of claim 1, wherein, The at least two observation regions comprise observation regions corresponding to any at least two passengers in the vehicle.

19. The head-up display system of claim 1, wherein, The head-up display system comprises any one of claims 1-19.

20. A motor vehicle characterized by ​

Images