Display device and vehicle

Abstract

The utility model relates to the technical field of projection display, in particular to display equipment and a vehicle. According to the invention, the plurality of light-emitting surfaces are arranged on the side, facing the image source, of the backlight source and form the certain angle, so that the angles, facing the incident surface of the image source, of the light-emitting surfaces in different directions are different, illumination light in multiple directions is incident to the image source under the condition that the same image source is shared, and then display light in different directions is emitted from the light-emitting surface of the image source. Therefore, light path transmission of different focal plane display is satisfied. The optical system for realizing multi-focal-plane display multiplexes the same image source, so that the cost is greatly saved, meanwhile, the occupied volume of the HUD display equipment is reduced, and the integration level is very high.

Description

Technical Field

[0001] The present application relates to the field of projection display technology, and particularly to a display device and a vehicle. Background Art

[0002] HUD (Head Up Display) is a new way of realizing in-vehicle display by reflecting on the vehicle windshield. Specifically, the light engine of the HUD display device emits display light, and projects it onto the windshield through corresponding optical lenses to generate a corresponding virtual image, forming an enhanced display effect with the real world outside the windshield. However, with the continuous development requirements of AR-HUD, the function of multi-focal plane display has gradually become an essential option for HUD display devices. Currently, most of the optical systems for realizing multi-focal planes occupy a relatively large space and are not conducive to integration into vehicles. For those optical path systems that require multiple light engines to achieve multi-focal plane display, it will additionally increase a lot of costs. Summary of the Invention

[0003] The purpose of the present application is to provide a display device and a vehicle, which solve the technical problems in the prior art that the optical path system for realizing multi-focal plane display of the HUD display device occupies a large volume and the cost is difficult to control.

[0004] To solve the above technical problems, the present application adopts the following technical solutions.

[0005] In a first aspect, the present application provides a display device, including:

[0006] A backlight source, an image source, and an optical path transmission structure;

[0007] The optical path transmission structure includes a first optical path and a second optical path. The first optical path is used to display a first focal plane at a first virtual image distance, and the second optical path is used to display a second focal plane at a second virtual image distance. The first virtual image distance is different from the second virtual image distance;

[0008] The backlight source includes a first light-emitting surface and a second light-emitting surface. The first light-emitting surface and the second light-emitting surface form a specific angle to emit illumination light in different directions, so that the illumination light emitted by the first light-emitting surface reaches the image source and then emits first display light in a first direction, and the illumination light emitted by the second light-emitting surface reaches the image source and then emits second display light in a second direction. The first direction is different from the second direction. The first display light in the first direction cooperates with the first optical path, and the second display light in the second direction cooperates with the second optical path.

[0009] According to the above description, in an optional implementation, by setting the light-emitting surfaces in different directions of the backlight source, the same image source is used to emit display light in different directions, greatly compressing the space occupied under the requirement of multi-focal plane display, and also reducing the cost of the light engine.

[0010] In an alternative embodiment of the first aspect, a spacer protrusion is provided between the first light-emitting surface and the second light-emitting surface.

[0011] According to the above description, in the alternative embodiment, stray light interference between the first light-emitting surface and the second light-emitting surface is eliminated by the spacer protrusion.

[0012] In an alternative embodiment of the first aspect, the cooperation between the first display light in the first direction and the first optical path, and the cooperation between the second display light in the second direction and the second optical path include:

[0013] The optical path length of the first display light transmitted in the first optical path is different from the optical path length of the second display light transmitted in the second optical path.

[0014] In an alternative embodiment of the first aspect, the cooperation between the first display light in the first direction and the first optical path, and the cooperation between the second display light in the second direction and the second optical path include:

[0015] The first optical path includes a first lens, and the second optical path includes a second lens;

[0016] The first focal length of the first lens is different from the second focal length of the second lens.

[0017] According to the above description, in the alternative embodiment, different virtual image distances where the first focal plane and the second focal plane are located are configured by changing the optical path lengths corresponding to the first optical path and the second optical path or the focal lengths of the optical lenses therein.

[0018] In an alternative embodiment of the first aspect, the illumination light emitted from the first light-emitting surface exits the first display light in the first direction after reaching the image source, and the illumination light emitted from the second light-emitting surface exits the second display light in the second direction after reaching the image source. The difference between the first direction and the second direction includes:

[0019] The first direction is determined by the direction of the illumination light emitted from the first light-emitting surface, and the second direction is determined by the direction of the illumination light emitted from the second light-emitting surface.

[0020] In an alternative embodiment of the first aspect, the first light-emitting surface and the second light-emitting surface support angular adjustment under mechanical control to change the direction of the emitted illumination light.

[0021] According to the above description, in the alternative embodiment, on the premise of multiplexing the image source, different display lights can satisfy different optical paths by adjusting the angles of different light-emitting surfaces of the backlight, so as to form focal planes with different virtual image distances on the windshield.

[0022] In an alternative embodiment of the first aspect, the first light-emitting surface and the second light-emitting surface are at a specific angle to emit illumination light in different directions, including:

[0023] The first optical path includes a first lens, and the second optical path includes a second lens;

[0024] The first light-emitting surface is disposed opposite to the first lens, and the second light-emitting surface is disposed opposite to the second lens.

[0025] According to the above description, the alternative embodiment can make the first display light reach the first lens and be transmitted along the first optical path, and make the second display light reach the second lens and be transmitted along the second optical path, so that information in different display lights can be displayed on different focal planes.

[0026] In an alternative embodiment of the first aspect, the first lens is a transmissive-reflective lens, the second lens is a reflective lens, the second lens is disposed on the side of the first lens away from where the virtual image is formed, and the second display light is reflected by the second lens and then transmitted through the first lens, being coaxial with the first display light reflected by the first lens.

[0027] According to the above description, the alternative embodiment can make the first focal plane and the second focal plane formed on the windshield be in the front and rear positions at the same height, thus meeting specific projection requirements.

[0028] In an alternative embodiment of the first aspect, both the first lens and the second lens are reflective lenses, and the first focal plane formed on the windshield after the first display light is reflected by the first lens and the second focal plane formed on the windshield after the second display light is reflected by the second lens are at different heights.

[0029] According to the above description, the alternative embodiment, through the optical path design of the optical path transmission structure, makes the first focal plane and the second focal plane formed by reflection on the windshield be in the front and rear positions at different heights, thereby avoiding the situation of front-to-back occlusion between the first focal plane and the second focal plane.

[0030] In an alternative embodiment of the first aspect, the first light-emitting surface and the second light-emitting surface are at a specific angle to emit illumination light in different directions, including:

[0031] The first light-emitting surface is inclined towards the second light-emitting surface between the backlight source and the image source, so that the illumination light emitted by at least one of the first light-emitting surface and the second light-emitting surface has the ability to illuminate the entire incident surface of the image source when reaching the image source.

[0032] In an alternative embodiment of the first aspect, the entire light-emitting surface of the backlight source is larger than the incident surface of the image source.

[0033] According to the above description, the optional implementation mode can control the illumination light irradiated onto the image source to reach any position area by adjusting the illuminated area on the first light-emitting surface or the second light-emitting surface, so as to meet the flexible distribution of the display content on different focal planes.

[0034] In an optional implementation mode of the first aspect, the illumination light emitted by the first light-emitting surface irradiates the image source and then emits the first display light in the first direction, and the illumination light emitted by the second light-emitting surface irradiates the image source and then emits the second display light in the second direction, including:

[0035] The first light-emitting surface is configured to be illuminated in the first area so that the emitted illumination light irradiates on the second area and then emits the first display light;

[0036] The second light-emitting surface is configured to be illuminated in the third area so that the emitted illumination light irradiates on the fourth area and then emits the second display light.

[0037] In an optional implementation mode of the first aspect, the second area and the fourth area do not overlap.

[0038] In an optional implementation mode of the first aspect, the second area and the fourth area form the display surface of the entire image source.

[0039] In an optional implementation mode of the first aspect, the second area surrounds the fourth area or the fourth area surrounds the second area.

[0040] In an optional implementation mode of the first aspect, the second area and the fourth area are evenly distributed.

[0041] According to the above description, the optional implementation mode emits display lights in different directions in different areas of the image source, and the shapes and proportions of different areas can be arbitrarily changed, so as to flexibly display different contents on different focal planes.

[0042] In an optional implementation mode of the first aspect, the content to be displayed on the first focal plane is configured in the second area, and the content to be displayed on the second focal plane is configured in the fourth area.

[0043] According to the above description, the optional implementation mode realizes the display content on different focal planes through different areas on the image source, saving the space occupied by additional image sources.

[0044] In an optional implementation mode of the first aspect, the illumination light emitted by the first light-emitting surface irradiates the image source and then emits the first display light in the first direction, and the illumination light emitted by the second light-emitting surface irradiates the image source and then emits the second display light in the second direction, including:

[0045] The first light-emitting surface is configured to emit illumination light that, after reaching the image source, irradiates all areas and emits first display light;

[0046] The second light-emitting surface is configured to emit illumination light that, after reaching the image source, irradiates all areas and emits second display light;

[0047] At the first time slice, the first light-emitting surface is lit and the second light-emitting surface is extinguished, and the image source is configured with content to be displayed on the first focal plane;

[0048] At the second time slice, the first light-emitting surface is extinguished and the second light-emitting surface is lit, and the image source is configured with content to be displayed on the second focal plane, and the first time slice and the second time slice are alternately performed periodically.

[0049] According to the above description, in an alternative embodiment, by the principle of persistence of vision, the display content on the first focal plane and the second focal plane is correspondingly displayed on the image source through different time slices. When the interleaving frequency between the first time slice and the second time slice is greater than the minimum frequency for forming persistence of vision, the first focal plane and the second focal plane will be seen to exist simultaneously.

[0050] In a second aspect, the present application provides a vehicle, including the display device described in the first aspect.

[0051] Compared with the prior art, in the present application, a plurality of light-emitting surfaces are provided on the side of the backlight facing the image source and are at a certain angle, so that the angles of the light-emitting surfaces in different directions facing the incident surface of the image source are different. Thus, under the condition of sharing the same image source, illumination light in multiple directions is incident on the image source, and display light in different directions is emitted from the light-emitting surface of the image source to meet the optical path transmission for different focal plane displays. The present application realizes the multiplexing of the same image source for a multi-focal plane display optical system, greatly saving costs, and at the same time reducing the volume occupied by the HUD display device and having a high integration level. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions of the present application, the drawings required for describing the technical solutions will be briefly introduced below. Obviously, the drawings described below are only some examples recorded in the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0053] Figure 1 It is a schematic diagram of HUD projection display in some examples of the present application.

[0054] Figure 2 It is a schematic diagram of the optical engine structure in some examples of the present application.

[0055] Figure 3Schematic diagram of the multi-focal plane display optical path system in some examples of this application.

[0056] Figure 4 Schematic diagram of the multi-focal plane display optical path system in some examples of this application.

[0057] Figure 5 Schematic diagram of the multi-focal plane display optical path system in some examples of this application.

[0058] Figure 6 Schematic diagram of the optical engine structure in some examples of this application.

[0059] Figure 7 Schematic diagram of the backlight partition control in some examples of this application.

[0060] Figure 8 Is Figure 7 Schematic diagram of the projection display effect in the example.

[0061] Figure 9 Schematic diagram of the backlight partition control in some examples of this application.

[0062] Figure 10 Is Figure 9 Schematic diagram of the projection display effect in the example.

[0063] Figure 11 Schematic diagram of the HUD display device module in some examples of this application.

[0064] Figure 12 Schematic diagram of the projection display in a vehicle in some examples of this application. Detailed implementation manners

[0065] The following will describe this application in detail with reference to the accompanying drawings. However, the content described is only some examples recorded in this application and does not limit this application. Any changes in structure, method, function, etc. made by those of ordinary skill in the art based on these examples are included in the protection scope of this application.

[0066] It should be noted that in different examples, the same reference numerals or marks may be used, but these do not represent an absolute connection relationship in terms of structure or function. Moreover, the "first", "second", etc. that may be mentioned in each example are only for the convenience of description and do not represent an absolute distinction relationship in terms of structure or function, nor can they be understood as indicating or implying relative importance or the quantity of the corresponding objects. Unless otherwise specified, the "at least one" that may be involved in the description refers to one or more than one, and the "multiple" refers to two or more than two.

[0067] In addition, when representing features, the character " / " can indicate an "or" relationship between the associated objects before and after. For example, head-up display / windshield display can mean head-up display or windshield display. When representing operations, the character " / " can indicate a division relationship between the associated objects before and after. For example, the magnification ratio M = L / P can be expressed as L (size of the virtual image) divided by P (size of the image source). Moreover, "and / or" in different examples is merely used to describe the association relationship between the associated objects before and after, and this association relationship can include three cases. For example, concave mirror and / or convex mirror can mean that there is a concave mirror alone, a convex mirror alone, or both a concave mirror and a convex mirror simultaneously.

[0068] The HUD projection display mainly utilizes the optical reflection principle. The imaging light to be displayed is reflected by a transparent surface and enters the viewer's eyes. The viewer can view the virtual image information along the reverse direction of the light. Correspondingly, the transparent surface can be the windshield of the vehicle, which acts as a display screen to show the vehicle's navigation instructions, vehicle speed, etc. As Figure 1As shown, for the optical system of single focal plane display, the HUD display device may at least include an optical engine 1, a first reflector 2, a second reflector 3, etc. Among them, the optical engine 1 includes a backlight source and an image source (not shown in the figure). The backlight source is used to provide illumination light and adjust the brightness of the illumination light according to control. For example, the backlight source can be an LED (Light Emitting Diode), a laser, etc. The image source adjusts the corresponding display content according to control under the illumination light provided by the backlight source and projects the display light out from the surface of the image source. For example, the image source can be an LCD (Liquid Crystal Display), a DMD (Digital Micromirror Devices), a MEMS (Micro-Electro-Mechanical System) micromirror, an LCOS (Liquid Crystal on Silicon), etc. The first reflector 2 and the second reflector 3 can project the display light projected by the optical engine 1 onto the windshield 4, realizing optical path customization in a small space and meeting different projection display requirements at the same time. The first reflector 2 and the second reflector 3 can be set as concave mirrors, convex mirrors, concave lenses, convex lenses, etc. according to the requirements of optical planning, and the surface shape of the lens can adopt a free-form surface. Optionally, at least one of the first reflector 2 and the second reflector 3 can also be adjusted by a certain angle, so as to change the projection position of the display light on the windshield 4 to meet viewers of different heights. The display light of the optical engine 1 finally forms a virtual image 5 after being reflected on the windshield 4 of the vehicle. When the human eye 6 observes the virtual image 5 facing the windshield 4, a certain sense of depth can be felt, just like observing a real object at a specific distance outside the windshield. The virtual image 5 can be navigation indication content, vehicle driving speed, etc. as described above. It should be added that for the characteristics of different optical engines, the HUD display device can also be provided with a diffuser. In some examples, the HUD display device can also include a Fresnel lens, a waveguide optical device, a diffractive optical device, a holographic optical device, a tapered optical fiber, etc.

[0069] As Figure 2As shown in the figure, the optical engine 1 includes an optical engine frame 18. The upper and lower ends of the optical engine frame 18 are respectively fixed with a backlight source 10 and an image source 19. The light-emitting surface of the backlight source 10 faces the incident surface of the image source 19 inside the optical engine frame 18. The illumination light emitted by the backlight source 10 reaches the incident surface of the image source 19 through the internal space of the optical engine frame 18, and then the display light is emitted from the light-emitting surface of the image source 19 (the side facing the outside of the optical engine frame 18). The display light has the image information projected on the windshield due to the modulation of the image source 19. In some examples, the backlight source 10 supports zonal control, and can independently light up or extinguish a specific area, or adjust the brightness of the illumination light in a specific area. Correspondingly, after the zonal-illuminated illumination light reaches the image source 19, the emitted display light also has the function of zonal display, or the display light emitted from a specific area has a specific brightness. Specifically, with the brightness provided by the illumination light, the image source 19 can emit display light containing a specified image on the display surface (i.e., the light-emitting surface) of the image source 19. Specifically, it can be that the controller connected to the image source 19 issues a display signal corresponding to the specified image, and the image source 19 converts it into an electric field change for controlling the display according to the display signal. Correspondingly, the image source 19 includes liquid crystals corresponding to a number of pixels. The liquid crystals can rotate the direction under the control of an electric field, thereby changing the traveling direction and the presented color of the light. When the illumination light emitted by the backlight source 10 reaches the image source 19, the rotation direction of the liquid crystals determines the transmission mode of the illumination light, thereby generating different images, that is, emitting display light containing different display information. When the backlight source 10 can be zonal-controlled, correspondingly, the content of zonal-controlled display can also be performed on the image source 19, that is, it can be to control the specific electric field change of the liquid crystals in a specific area through the controller, presenting different light traveling directions and presented colors in different areas. In some examples, a lens combination can be provided between the backlight source 10 and the image source 19 to converge and homogenize the illumination light emitted by the backlight source 10.

[0070] In some examples, in order to meet the actual projection requirement of fitting the real scenes at different distances outside the vehicle, multiple focal planes are provided, and different focal planes are used to adapt to the real scenes at different positions to reduce the sense of disharmony caused by dynamic parallax, etc. Optionally, the optical system of the HUD display device projects with at least a first focal plane and a second focal plane. The virtual image distances of the first focal plane and the second focal plane from the human eye are different. In this way, when the user inside the vehicle looks at the windshield, two focal planes with different depths are observed to be displayed. Correspondingly, different projection information is displayed on different focal planes according to actual needs. Assume that the virtual image distance of the first focal plane is less than that of the second focal plane, that is, the first focal plane is closer to the position of the eyes of the user inside the vehicle. Therefore, an image that fits the real scene at a relatively close position outside the vehicle can be correspondingly displayed on the first focal plane, while an image that fits the real scene at a relatively far position outside the vehicle can be correspondingly displayed on the second focal plane.

[0071] In some examples, such as Figure 3As shown, the first focal plane 51 and the second focal plane 52 are respectively formed by the optical system projecting the specified display light onto the windshield 4 and reflecting it. In this example, due to the optical path design inside the optical system, the distance between the first focal plane 51 and the human eye 6 is less than the distance between the second focal plane 52 and the human eye 6. Specifically, different projection display contents are configured on the first focal plane 51 and the second focal plane 52. When the human eye 6 observes the contents on the first focal plane 51 and the second focal plane 52, it will feel different depths. At the same time, there is an overlapping relationship between the image contents at the same height on the first focal plane 51 and the second focal plane 52. Correspondingly, since the first focal plane 51 is closer to the human eye 6, the image content on the first focal plane 51 will block the image content at the same height on the second focal plane 52. In this example, in the optical system, the multiplex display light is finally projected onto the windshield 4 through the reflector 3. Before the corresponding display light is transmitted to the reflector 3, there are two optical lenses, namely the transmissive-reflective lens 21 and the reflector 22. For the transmissive-reflective lens 21, the light incident from the front can be reflected on the front side, and the light incident from the back can be transmitted from the front side. Correspondingly, the front of the transmissive-reflective lens 21 faces the reflector 3, and the back faces the reflector 22, that is, the back of the transmissive-reflective lens 21 faces away from the first focal plane 51 and the second focal plane 52. The reflector 22 can receive a path of light, reflect it, reach the back of the transmissive-reflective lens 21, and then transmit it to the front of the transmissive-reflective lens 21, so as to transmit together with a path of light directly reflected by the front of the transmissive-reflective lens 21 to the reflector 3. Because of the specific angle cooperation between the transmissive-reflective lens 21, the reflector 22 and the optical engine 1, the two paths of light reflected on the transmissive-reflective lens 21 and the reflector 22 are on the same optical axis before reaching the reflector 3. In this way, the first focal plane 51 and the second focal plane 52 formed are also coaxial, that is, at the same height, which can reduce the difficulty of the combined display of the virtual images of the two focal planes and form different virtual image combination ranges with different depths.

[0072] In some examples, such as Figure 4 shown, the reflector 3 also supports guiding the two paths of display light in this example onto the windshield 4 to be reflected to form the first focal plane 51 and the second focal plane 52. Different from Figure 3 the example, there are reflectors 21 and 22 before the reflector 3. The reflectors 21 and 22 respectively receive different paths of light to form reflections and transmit them to the reflector 3, and finally guide them to the windshield 4 to generate reflections. Since the transmission paths of the two paths of light are different, the first focal plane 51 and the second focal plane 52 have different virtual image distances and height positions. In this example, since the first focal plane 51 and the second focal plane 52 are completely staggered, information can be displayed at any position on the two focal planes, and there will be no occlusion between the front and back focal planes. In some examples, such as Figure 5As shown, two beams of light emitted by the optical engine 1, one beam of light directly reaches the mirror 3 and after reflection, is projected onto the windshield 4 to form the first focal plane 51. While the other beam of light will reach the mirror 3 only after multiple reflections on the mirrors 21 and 22, and finally is projected onto the windshield 4 to form the second focal plane 52. Since the optical path of the light corresponding to the formation of the second focal plane 52 is significantly longer, the virtual image distance of the second focal plane 52 is also farther than that of the first focal plane 51.

[0073] It should be noted that the multi-focal plane projection display is not limited to the above-mentioned optical system example, and other lens combinations can also be used to achieve it. Optionally, the virtual image distances of the first focal plane and the second focal plane can also be configured by changing the focal lengths of the optical lenses in the optical path transmission structure, so as to meet the actual projection display requirements.

[0074] As described above, referring to Figures 3 - 5 , for the optical system corresponding to the HUD display device, in order to achieve multi-focal plane projection display, in addition to the windshield 4 that forms a virtual image by reflection, it mainly includes two parts: the optical engine 1 and the optical path transmission structure. In the optical path transmission structure, multiple beams of light corresponding to multiple focal planes are finally transmitted to the windshield 4 through the combination of multiple optical lenses. During this process, optical lenses can be used to configure the optical paths of different beams of light and change the projection angles of the light. For the optical engine 1, it can include two parts: the backlight source 10 and the image source 19. Different from Figure 2 the example, in order to achieve multi-focal plane projection display, at least two beams of display light need to be projected from the same optical engine 1, respectively corresponding to different focal planes and their corresponding optical paths. In Figures 3 - 5 the example, generating multiple beams of light through one optical engine can save the cost of the optical engine, thereby reducing the occupation of space size by multiple optical engines. As Figure 6 shown, the optical engine 1 applied to Figures 3 - 5 the example specifically includes the optical engine frame 18 and the backlight source 10 and the image source 19 fixed at both ends of the optical engine frame 18. The backlight source 10 can provide the display brightness to the image source 19. Different from Figure 2 the example, the light-emitting surface of the backlight source 10 facing the image source 19 at least includes the light-emitting surface 101 and the light-emitting surface 102. The angles of the light-emitting surface 101 and the light-emitting surface 102 facing the incident surface of the image source 19 are different, and the two light-emitting surfaces can be controlled separately. More specifically, each light-emitting surface can separately light up the illumination light in a specific area, which will be described in detail below.

[0075] In some examples, the light-emitting surface 101 and the light-emitting surface 102 form a certain angle, so that the illumination light emitted from the light-emitting surface 101 is in the first direction 191, and the illumination light emitted from the light-emitting surface 102 is in the second direction 192. Optionally, in order to reduce the interference between the two light-emitting surfaces, a spaced projection is provided between the light-emitting surface 101 and the light-emitting surface 102, that is, it can be slightly projected at the bent portion where the light-emitting surface 101 and the light-emitting surface 102 meet, so as to block the illumination light emitted from the boundary, for example, to prevent the illumination light of the light-emitting surface 101 close to the light-emitting surface 102 from scattering into the area opposite to the light-emitting surface 102 and even reflecting on the light-emitting surface 102 to form stray light. In this example, the angle formed by the light-emitting surface 101 and the light-emitting surface 102 can make the light-emitting surface 101 and the light-emitting surface 102 approach each other in the internal space of the optical engine frame 18 at a certain inclination, so as to ensure that the illumination light emitted from the light-emitting surface 101 and the light-emitting surface 102 can cover as many incident surfaces of the image source 19 as possible, so that most areas of the image source 19 can display corresponding image information and emit corresponding display light under the drive of the illumination light. Optionally, the projected areas of the light-emitting surface 101 and the light-emitting surface 102 relative to the image source 19 can be the same or different. Correspondingly, the included angle between the light-emitting surface 101 and the light-emitting surface 102 can also be configured so that the illumination light emitted by at least one of the light-emitting surface 101 and the light-emitting surface 102 has the ability to illuminate the entire incident surface of the image source 19 when reaching the image source 19, so that one of the light-emitting surfaces can illuminate a part of the image source 19, and the remaining area of the image source 19 can be provided with brightness by the other light-emitting surface, and the entire image source 19 can normally display all areas under the illumination of the illumination light, only with different display light directions. In more examples, the included angle between the light-emitting surface 101 and the light-emitting surface 102 can also be flexibly adjusted according to the actual situation. The light-emitting surface 101 and / or the light-emitting surface 102 can be mechanically rotated under the drive of the motor to form different angles, meet different illumination requirements, and adjust the illumination area on the image source 19. Further, in order to ensure that the illumination light emitted from the light-emitting surface 101 and the light-emitting surface 102 can cover the incident surface of the image source 19, the light-emitting surface of the backlight 10 is larger than the incident surface of the image source 19, that is, the two ends of the whole formed by the light-emitting surface 101 and the light-emitting surface 102 should extend beyond the two ends of the image source 19. Referring to Figures 3 - 5 Example, the whole optical engine 1 can be trapezoidally arranged.

[0076] As described above, the light-emitting surface 101 emits illumination light along the first direction 191. When this illumination light reaches the image source 19, the first display light modulated with image information is projected from the light-emitting surface of the image source 19. According to the principle of light transmission, the first display light will continue to transmit outward along the first direction 191. Similarly, the light-emitting surface 102 emits illumination light along the second direction 192. When this illumination light reaches the image source 19, the second display light with a different direction from the first display light is projected from the light-emitting surface of the image source 19, and the second display light transmits along the second direction 192. Correspondingly, the first direction 191 where the first display light is located is determined by the orientation of the light-emitting surface 101 and the direction of the illumination light emitted from the light-emitting surface 101, and the second direction 192 where the second display light is located is determined by the orientation of the light-emitting surface 102 and the direction of the illumination light emitted from the light-emitting surface 102. Further, in order to enable the emitted first display light and second display light to transmit along the predetermined path in the optical path transmission structure, the light-emitting surfaces 101 and 102 that play a decisive role can be oriented towards the corresponding optical lenses in the optical path transmission structure.

[0077] Take Figure 3 as an example. The first light-emitting surface located at the lower right side in the optical engine 1 cooperates with the image source 19 to emit the first display light. The first light-emitting surface faces the optical lens 21 that realizes the first optical path planning, so that the first display light can reach the optical lens 21 and then transmit along the first optical path. The second light-emitting surface located at the upper left side in the optical engine 1 also cooperates with the image source 19 to emit the second display light. The second light-emitting surface faces the optical lens 22 that realizes the second optical path planning, so that the second display light can reach the optical lens 22 and then transmit along the second optical path. It should be noted that the "upper", "lower", "left", and "right" referred to in the context are determined by the relative position relationship in the figure. In this example, the second display light transmitted along the second optical path will also transmit from the back surface to the front surface of the optical lens 21, that is, the optical lens 21 can realize both reflection and transmission, which will not be elaborated here. At the same time, since the optical path of the second optical path is longer than that of the first optical path, the virtual image distance of the second focal plane 52 is also longer than that of the first focal plane 51.

[0078] Take Figure 4For example, the first light-emitting surface located in the upper left side of the optical engine 1 faces the optical lens 21. Therefore, the illumination light emitted from the first light-emitting surface and the first display light formed at the image source 19 will reach the optical lens 21 along the orientation of the first light-emitting surface, and continue to be transmitted along the first optical path determined by the optical lens 21. Specifically, after being reflected by the reflector 3, it reaches the windshield 4. The second light-emitting surface located in the lower right side of the optical engine 1 faces the optical lens 22. Therefore, the determined second display light will be projected from the light-emitting surface of the image source 19 and transmitted in the direction of the optical lens 22, and then continue to be transmitted along the second optical path determined by the optical lens 22. Specifically, after being reflected by the reflector 3 in the same way, it reaches the windshield 4. Since the transmission paths of the two beams of light are different, the reflection positions on the windshield 4 are also different, resulting in different heights of the corresponding first focal plane 51 and second focal plane 52.

[0079] Taking Figure 5 as an example, the first light-emitting surface located above in the optical engine 1 directly faces the reflector 3. Therefore, the first display light formed at the image source 19 accordingly will be directly transmitted to the reflector 3 and continue to be transmitted along the first optical path and finally be reflected on the windshield 4 to form the first focal plane 51. The second light-emitting surface located below in the optical engine 1 faces the optical lens 21. In this example, both the optical lens 21 and the optical lens 22 are reflectors, and the second optical path of the light transmission is realized through the corresponding angle matching. The second display light formed by the illumination light emitted from the second light-emitting surface hitting the image source 19 will be transmitted to the optical lens 21 along the orientation of the second light-emitting surface, and be reflected multiple times between the optical lens 21, the optical lens 22, and the reflector 3, and continue to be transmitted along the second optical path and be reflected on the windshield 4 to form the second focal plane 52. According to the above example, the first display light is transmitted along the first optical path, and the first image information carried in the first display light will be projected and displayed on the first focal plane, while the second display light is transmitted along the second optical path, and the second image information carried in the second display light will be projected and displayed on the second focal plane. The first image information and the second image information are modulated by the image sources emitting the first display light and the second display light, which will be described in detail below. Optionally, when the optical path in the first optical path is different from the optical path in the second optical path, the virtual image distances of the first focal plane and the second focal plane from the human eye 6 are different. When the optical path of the first optical path is greater than the optical path of the second optical path, the human eye 6 will feel that the first image is farther than the second image.

[0080] As described above, when the optical engine 1 can generate two or more display lights simultaneously, the image information carried in the display lights in different directions will be projected and displayed on different focal planes respectively. Further, in order to make the image information carried in different display lights different, so as to project different images on different focal planes, the illumination light in a specific area can be emitted from different light-emitting surfaces and respectively irradiated on different areas of the image source 19. Correspondingly, different images can be displayed by controlling different areas of the image source, so that the display lights in different directions can carry different image information. As Figure 7 , Figure 8 shown, in some examples, the lit areas on the light-emitting surface 101 and the light-emitting surface 102 are controlled, and the orientations of the light-emitting surface 101 and the light-emitting surface 102 in cooperation with the image source 19 determine the irradiation areas of the lit areas on the light-emitting surface 101 and the light-emitting surface 102 on the image source 19 respectively. In this example, the middle first area of the light-emitting surface 101 is lit, and the illumination light emitted from the first area will exactly irradiate the middle second area of the image source 19, and the first display light is emitted from the second area. The image information carried by the first display light can be realized by controlling the liquid crystal direction of the second area of the image source 19, etc. At the same time, the third area around the light-emitting surface 102 is lit, and the illumination light emitted from the third area will exactly irradiate the fourth area around the image source 19, and the second display light is emitted from the fourth area. The image information carried by the second display light can be realized by controlling the fourth area of the image source 19. Correspondingly, since the first display light and the second display light have different directions according to the orientations of the light-emitting surface 101 and the light-emitting surface 102 and are transmitted along different optical paths, they will be projected on different focal planes. Therefore, the images displayed between the second area and the fourth area do not need to be continuous and can be separately configured and displayed on the image source according to the display requirements on different focal planes. In this example, through the cooperation of the lit areas between the light-emitting surface 101 and the light-emitting surface 102, all areas of the image source 19 can be illuminated to form display lights in different directions. Specifically, the lit areas need to be selected and configured according to the angle between the light-emitting surface 101 and the light-emitting surface 102, so as to maximize the utilization of the image source 19. In some examples, in order to ensure that the information displayed on different focal planes does not have duplicate content, the second area and the fourth area illuminated by different light-emitting surfaces need to not overlap, that is, there is no area on the image source that generates both the first display light transmitted along the first optical path and the second display light transmitted along the second optical path. Optionally, in addition to changing the distribution of the second area and the fourth area by changing the lit ranges of the first area and the third area, the distribution of the second area and the fourth area can also be changed by changing the angle between the light-emitting surface 101 and the light-emitting surface 102. Referring to the above example, the motor can be controlled to achieve angular rotation. As Figure 8As shown, according to the distribution of the second region and the fourth region, the middle image on the image source is displayed on the first focal plane closer to the human eye 6, and the surrounding images on the image source are displayed on the second focal plane farther from the human eye 6. In this way, the effect observed by the human eye 6 is an image display content with a sense of hierarchy, and the depth gradually increases from the center to the periphery. There may also be a certain dynamic parallax as the position of the human eye 6 is slightly adjusted. Optionally, the display contents of the second region and the fourth region are swapped, or the optical path transmission structure is changed so that the optical path traveled by the display light emerging from the middle region is longer, thereby achieving the effect of gradually decreasing depth from the center to the periphery.

[0081] As Figure 9 As shown in FIG. 10, in some examples, the image source 19 is configured to project the display contents of the halved regions onto the first focal plane and the second focal plane respectively. Optionally, the allocated ratio may not be limited to 1:1 and can be specifically determined according to the needs of planning the display contents on the first focal plane and the second focal plane. It can even be dynamically allocated according to the changes in the scene. Specifically, the configuration ratio on the image source 19 is adjusted by changing the lit regions of the light-emitting surface 101 and the light-emitting surface 102. In this example, by lighting the first region at the lower part of the light-emitting surface 101, the illumination light emitted from the lit region can be irradiated onto the second region at the lower part of the image source 19 according to the orientation of the light-emitting surface 101. By controlling the display in the second region, the first display light in the first direction 191 can be emitted. Similarly, by lighting the third region at the upper part of the light-emitting surface 102, which is just complementary to the lit region of the light-emitting surface 101, the illumination light emitted from the lit region can be irradiated onto the fourth region at the upper part of the image source 19 according to the orientation of the light-emitting surface 102. By controlling the display in the fourth region, the second display light in the second direction 192 can be emitted. The first display light and the second display light are respectively projected onto the windshield through different optical paths in the optical path transmission structure, thereby displaying the corresponding information on the first focal plane 51 and the second focal plane 52. As Figure 10As shown, the first focal plane 51 is formed at a position relatively close to the lower part of the human eye 6 under the action of the optical path transmission structure, and its content is consistent with the display content of the second area in the image source 19. The second focal plane 52 is formed at a position relatively far from the upper part of the human eye 6 under the action of the optical path transmission structure, and its content is consistent with the display content of the fourth area in the image source 19. In this example, the first focal plane 51 can display some instrument information, such as vehicle speed, etc., that is, the image source can be controlled to output instrument information in the second area, while the second focal plane 52 displays navigation marks that are fitted to the road ahead, etc., that is, the image source can be controlled to output navigation marks in the fourth area. Optionally, the virtual image distance of the first focal plane 51 can also be made greater than the virtual image distance of the second focal plane 52, or the formation height of the first focal plane 51 can be made greater than the formation height of the second focal plane 52 by changing the optical path transmission structure. Optionally, the relative position relationship between the first focal plane 51 and the second focal plane 52 can also be changed by changing the illuminated areas of the light-emitting surfaces 101 and 102. For example, the second area and the fourth area of the image source 19 illuminated by the illumination light are evenly divided left and right. As described above, since the illuminated areas of the light-emitting surfaces 101 and 102 can support flexible setting, the correspondingly projected first focal plane 51 and second focal plane 52 can form various required shapes, so as to meet different display scenarios, and the matching shape combinations are not limited to the above examples.

[0082] In some examples, especially for Figure 4 、 Figure 5 the optical path transmission structure, although the first focal plane 51 and the second focal plane 52 have different virtual image distances, they are staggered in imaging height, so there is no occlusion relationship, and full-frame display can be achieved. Correspondingly, the display area on the surface of the image source 19 can be effectively utilized by means of time division, so that the display frames on the first focal plane 51 and the second focal plane 52 are large enough to carry more display content. Taking Figure 4 the optical path transmission structure as an example, in order to achieve the simultaneous display of the first focal plane 51 and the second focal plane 52, and Figures 7 - 10Different from the example, the backlight 10 facing the image source 19 specifically includes a first light-emitting surface located at the upper left side and a second light-emitting surface located at the lower right side. Correspondingly, the illumination light from the first light-emitting surface reaching the image source 19 supports illuminating the entire incident surface of the image source 19, and the formed first display light is transmitted on the first optical path through the reflector 21 and the reflector 3, and finally forms a first focal plane 51 by reflecting on the windshield 4. The illumination light from the second light-emitting surface reaching the image source 19 also supports illuminating the entire incident surface of the image source 19, and the formed second display light is transmitted on the second optical path through the reflector 22 and the reflector 3, and finally forms a second focal plane 52 by reflecting on the windshield 4. Further, in order to make the display contents of the first focal plane and the second focal plane different, in this example, the lighting times of the first light-emitting surface and the second light-emitting surface are staggered. In the first time slice, the first light-emitting surface is lit to make the image source 19 emit the first display light. At this time, the image source 19 is configured to display the content that needs to be displayed on the first focal plane 51, and at the same time, the second light-emitting surface will not be lit, that is, the image source 19 will not emit the second display light. In the second time slice, the second light-emitting surface is lit to make the image source 19 emit the second display light. At this time, the image source 19 is configured to display the content that needs to be displayed on the second focal plane 52, and at the same time, the first light-emitting surface is in the extinguished state. Correspondingly, the first time slice and the second time slice are staggered, and the staggering frequency should meet the cycle of the human eye's visual persistence, so that the human eye cannot perceive the situation that a specific focal plane in a certain time slice is not displayed. For example, the staggering period of the first time slice and the second time slice is 0.1 second. In this example, due to the effect of visual persistence, the human eye 6 facing the windshield 4 can simultaneously see the contents of the first focal plane 51 and the second focal plane 52. Although in fact the first focal plane 51 and the second focal plane 52 are not projected simultaneously at the same moment, the afterglow effect in the human eye makes up for the focal plane display in the disappearing stage. More importantly, both the first focal plane 51 and the second focal plane 52 utilize all areas of the image source 19 for display. Therefore, the display contents of the first focal plane 51 and the second focal plane 52 are relatively rich, and the space for development is relatively large.

[0083] As Figure 11 shown, the HUD display device integrated in the vehicle can be powered and provided with data by the vehicle computer 92, or can be powered and generate data by the HUD display device itself. In addition to including the optical system for realizing multi-focal plane display in the above example, the HUD display device may specifically include a processor 91, an Ethernet interface 901, a CAN (Controller Area Network) interface 902, a power management module 903, a running memory 904, a storage memory 905, a temperature monitoring 906, a motor 907, a backlight 908, an image source 909, a positioning module 910, a radar 911, a camera 912, etc.

[0084] It should be noted that Figure 11The various modules listed are only exemplary descriptions and do not constitute any limitations. In some examples, the HUD display device may further include other modules. Additionally, the above modules may be implemented in one or more hardware components in different examples, or a single module may be implemented by a combination of multiple hardware components.

[0085] Among them, the processor 91 serves as the control center of the HUD display device and includes one or more processing units of any type, including but not limited to a microcontrol unit, a microcontroller, a DSP (Digital Signal Processor), or any combination thereof. The processor 91 is used to generate operation control signals according to a computer program, implement the control of other various modules, and cooperate with the corresponding modules to process the acquired data, instructions, etc., or the data and instructions that the processor itself has.

[0086] The Ethernet interface 901 is a network data connection port for local area network communication, which defines a series of software and hardware standards. Through the Ethernet interface 901, multiple electronic devices can be connected together. In this example, the processor 91 can interact with the vehicle head unit 92 through the Ethernet interface 901, such as sending data to the vehicle head unit 92 or receiving data sent by the vehicle head unit 92.

[0087] The CAN interface 902 is a network data connection port for the controller area network, which provides a standard bus for the control system inside the vehicle and embedded industrial control to achieve communication and interaction between control nodes. In this example, the processor 91 can also interact with the vehicle head unit 92 through the CAN interface 902. Optionally, the processor 91 can also be connected to other external devices through the CAN interface 902. In some examples, the processor 91 may also be provided with a GPIO (General-purpose input / output) interface to improve the compatibility of peripheral connections.

[0088] The power management module 903 is connected to the vehicle head unit 92 and can receive the power provided by the vehicle head unit 92 to supply a regulated power supply to each module of the HUD display device, ensuring that the processor 91 and each module operate under normal voltage supply and avoiding damage under overvoltage.

[0089] The operating memory 904 is used to store the computer programs executed by the processor 91, as well as temporarily store operation data, data exchanged with the storage memory, etc. The operating memory 904 can be a memory such as SDRAM (Synchronous Dynamic Random-access Memory).

[0090] A storage memory 905 is used to store resources such as relevant display content of the HUD display device, as well as long-term stored operating programs and data, etc. The storage memory 905 can be a memory such as Flash (flash memory). In some examples, the processor 91 can also provide an interface to access an external memory.

[0091] A temperature detection 906 is used to monitor the temperature inside the HUD display device. Specifically, it can include several temperature sensors. Since the resistance value of the temperature sensor changes with the change of temperature, the processor 91 can determine the resistance value of the temperature sensor at the corresponding temperature according to the voltage change between each temperature sensor and the voltage-dividing resistor under a fixed power supply voltage, and thus inversely deduce the temperature at the position where the temperature sensor is located. In some examples, the processor 91 can control several temperature sensors through the GPIO interface. The several temperature sensors can be set at different positions inside the HUD display device, and the processor 91 can use the time-sharing detection method to respectively obtain the temperature values fed back by the several temperature sensors.

[0092] A motor 907 is used to drive the optical lens in the HUD display device to rotate under the control of the processor 91, so as to realize the change of the corresponding optical path. For example, when sunlight backflows and causes a temperature rise on the surface of the image source, the optical lens can be driven by the motor to prevent the external sunlight from reaching the surface of the image source. In some examples, the processor 91 can also drive a fan provided on the HUD display device through the motor 907 to improve the speed of air exchange inside and outside the HUD display device to achieve heat dissipation. Specifically, the motor 907 is connected to the processor 91 through a motor drive chip. The motor drive chip provides high-performance power output for the motor 907 and can also communicate and control with the processor 91 through interfaces such as SPI (Serial Peripheral Interface).

[0093] A backlight 908 is used to provide illumination light and adjust the brightness of the illumination light according to the control of the processor 91 to adjust the projection display brightness of the entire HUD display device. The backlight 908 cooperates with the image source 909 to realize the main functions of optical engine projection display. The backlight 908 can be an LED (Light Emitting Diode), laser, etc. Specifically, the backlight 908 is connected to the processor 91 through a backlight drive chip. The backlight drive chip provides a drive voltage for the backlight 908 and controls the brightness of the backlight 908 under the pulse width signal output by the processor 91.

[0094] The image source 909 is used to display an image corresponding to the content according to the control of the processor 91 and project the display light corresponding to the image. The image source 909 can be an LCD (Liquid Crystal Display), DMD (Digital Micromirror Devices), MEMS (Micro-Electro-Mechanical System) micromirror, LCOS (Liquid Crystal on silicon), etc.

[0095] The positioning module 910 is used to monitor the position of the HUD display device and the corresponding vehicle. The positioning module 910 can be a global navigation satellite system such as GPS (Global Positioning System) or Beidou satellite navigation system. By measuring the distance between the satellite and the receiver on the positioning module 910 at different positions, the corresponding position and orientation data can be determined. In some examples, the positioning module 910 can also include an inertial navigation system. Based on Newton's laws of motion, by measuring the acceleration of the positioning module 910 in an inertial reference frame, integrating it over time, and transforming it into the navigation coordinate system, data such as speed, yaw angle, and position in the navigation coordinate system can be obtained. Optionally, the inertial navigation system can assist the global navigation satellite system to achieve more accurate positioning and provide the corresponding position information to the processor 91.

[0096] The radar 911 is used to determine the position of the target object through electromagnetic waves and can usually determine the distance between the target object and the vehicle where the radar 911 is located.

[0097] The camera 912 includes a vehicle body camera and an in-vehicle camera. Among them, the vehicle body camera is used to determine the position of the target object through visual recognition. The vehicle body camera can be a monocular camera or a binocular camera. The biggest difference between a monocular camera and a binocular camera is that the binocular camera can capture images from two different perspectives, so as to obtain distance information in three-dimensional space. The in-vehicle camera is used to identify the behavior states of the driver and passengers in the vehicle, including fatigue detection, distraction detection, expression recognition, gesture recognition, gaze tracking, etc. In this example, the in-vehicle camera can also specifically implement eye movement tracking.

[0098] In some examples, the positioning module 910, radar 911, and camera 912 can also be directly connected to the vehicle head unit 92 and are not directly connected to the processor 91 of the HUD display device. For example, the vehicle head unit 92 itself integrates a positioning module for position tracking and a radar and camera for autonomous driving. The HUD display device can then obtain the acquisition data of the positioning module, radar, and camera in real time through communication with the vehicle head unit 92.

[0099] As Figure 12 shown, in some examples, a vehicle may be provided with the above-mentioned HUD display device. Specifically, the HUD display device is integrated inside the center console 10, such as in the front position of the steering wheel. Through the projection window 102 of the HUD display device, the corresponding display light is projected onto the vehicle windshield 4 directly opposite. What the viewer observes on the windshield 4 from inside the cockpit is that they can directly see the corresponding virtual image. Specifically, in the corresponding display area 50 of the windshield 4, it includes basic display information (such as vehicle speed information) and extended display information (such as warning information of the vehicle in front). As the driver, who is the viewer, can view the corresponding vehicle status without having to lower their head while driving, it improves driving safety. More importantly, when the user looks towards the windshield 4 from inside the driver's cab, they can see at least two or more virtual images with different depths, which improves the scene adaptability of the enhanced display. Since in this example, the HUD display device with multi-focal plane display only shares a set of optical engine in the optical system, it saves the occupied space inside the center console 10 and makes it possible to integrate into various vehicle models. It should be noted that the vehicle is not limited to a car as a means of transportation, and may also include buses, trucks, excavators, motorcycles, trains, high-speed rails, ships, yachts, airplanes, spaceships, etc. The projected windshield is not limited to the front windshield of a car, and may also be a transparent surface at other positions.

[0100] Combined with the above examples, the technical solution involved in this application can be directly embodied as hardware, software modules executed by a control unit, or a combination of both, that is, one or more steps and / or one or more combinations of steps. It can correspond to each software module in the computer program flow, and can also correspond to each hardware module, such as ASIC (Application Specific Integrated Circuit), FPGA (Field-Programmable Gate Array), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof. For the convenience of description, in the above description, various modules are described separately according to their functions. Of course, when implementing this application, the functions of each module can be implemented in the same or multiple software and / or hardware.

[0101] Through the description of the above examples, those skilled in the art can clearly understand that the present application can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution involved in the present application, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This software is executed by a microcontroller unit, depends on the required configuration, and may include any type of one or more microcontroller units, including but not limited to microcontroller units, microcontrollers, DSPs (Digital Signal Processors), or any combination thereof. This software is stored in a memory, for example, a volatile memory (such as a random access memory, etc.), a non-volatile memory (such as a read-only memory, a flash memory, etc.), or any combination thereof.

[0102] In summary, in the present application, a plurality of light-emitting surfaces are provided on the side of the backlight facing the image source and are at a certain angle, so that the angles of the light-emitting surfaces in different directions facing the incident surface of the image source are different. Thus, under the condition of sharing the same image source, illumination light in multiple directions is incident on the image source, and then display light in different directions is emitted from the light-emitting surface of the image source to meet the optical path transmission for different focal plane displays. The optical system of the present application for realizing multi-focal plane display multiplexes the same image source, greatly saving costs, while reducing the volume occupied by the HUD display device and having a very high integration degree.

[0103] It should be understood that although this specification includes some examples, any one of these examples does not contain only an independent technical solution. Such a narrative way of the specification is only for the purpose of clarity. Those of ordinary skill in the art should regard the specification as a whole, and the technical solutions in each example can also be appropriately combined to form other embodiments that can be understood by those of ordinary skill in the art.

[0104] The series of detailed descriptions listed above are only specific descriptions of the feasible implementation manners of the present application, and they are not intended to limit the protection scope of the present application. Any equivalent implementation manners or variations made without departing from the teaching content of the present application should be included within the protection scope of the present application.

Claims

1. A display device, characterized in that, Comprising: A backlight source, an image source, and an optical path transmission structure; The optical path transmission structure includes a first optical path and a second optical path. The first optical path is used to display a first focal plane at a first virtual image distance, and the second optical path is used to display a second focal plane at a second virtual image distance. The first virtual image distance is different from the second virtual image distance; The backlight source includes a first light-emitting surface and a second light-emitting surface. The first light-emitting surface and the second light-emitting surface form a set angle to emit illumination light in different directions, so that the illumination light emitted by the first light-emitting surface reaches the image source and then emits first display light in a first direction, and the illumination light emitted by the second light-emitting surface reaches the image source and then emits second display light in a second direction. The first direction is different from the second direction. The first display light in the first direction cooperates with the first optical path, and the second display light in the second direction cooperates with the second optical path.

2. The display device according to claim 1, wherein The cooperation between the first display light in the first direction and the first optical path, and the cooperation between the second display light in the second direction and the second optical path include: The optical path lengths of the first display light transmitted in the first optical path and the second display light transmitted in the second optical path are different.

3. The display device according to claim 1, wherein The illumination light emitted by the first light-emitting surface reaches the image source and then emits first display light in a first direction, and the illumination light emitted by the second light-emitting surface reaches the image source and then emits second display light in a second direction. The fact that the first direction is different from the second direction includes: The first direction is determined by the direction of the illumination light emitted by the first light-emitting surface, and the second direction is determined by the direction of the illumination light emitted by the second light-emitting surface.

4. The display device according to claim 1, characterized in that, The fact that the first light-emitting surface and the second light-emitting surface form a set angle to emit illumination light in different directions includes: The first optical path includes a first lens, and the second optical path includes a second lens; The first light-emitting surface is disposed opposite to the first lens, and the second light-emitting surface is disposed opposite to the second lens.

5. The display device according to claim 4, wherein, The first lens is a transmissive and reflective lens, and the second lens is a reflective lens. The second lens is disposed on the side of the first lens away from the formation of the virtual image. The second display light is reflected by the second lens and then transmitted through the first lens, and is coaxial with the first display light reflected by the first lens.

6. The display device according to claim 4, characterized in that, Both the first lens and the second lens are reflective lenses. The first focal plane formed by the first display light reflected by the first lens on the windshield is at a different height from the second focal plane formed by the second display light reflected by the second lens on the windshield.

7. The display device according to claim 1, characterized in that, The fact that the first light-emitting surface and the second light-emitting surface form a set angle to emit illumination light in different directions includes: The first light-emitting surface is inclined towards the second light-emitting surface between the backlight source and the image source, so that the illumination light emitted by at least one of the first light-emitting surface and the second light-emitting surface has the ability to illuminate the entire incident surface of the image source when reaching the image source.

8. The display device according to claim 1, wherein The illumination light emitted by the first light-emitting surface reaches the image source and then emits first display light in a first direction, and the illumination light emitted by the second light-emitting surface reaches the image source and then emits second display light in a second direction includes: The first light-emitting surface is configured to light up a first area so that the emitted illumination light reaches the image source and then irradiates on a second area to emit first display light; The second light-emitting surface is configured to light up a third area so that the emitted illumination light reaches the image source and then irradiates on a fourth area to emit second display light.

9. The display device according to claim 8, wherein, The second area and the fourth area do not overlap.

10. A vehicle, characterized in that, Comprising the display device according to any one of claims 1-9.

Images