Light emitting module for vehicle-mounted hud device and vehicle-mounted hud device

Abstract

This application discloses a light-emitting module for an in-vehicle HUD device and the in-vehicle HUD device itself. The light-emitting module includes an optical engine, a deflecting prism, and a PCB board. The optical engine, deflecting prism, and PCB board form an integral component through a module base. The optical engine, deflecting prism, and PCB board are all shaped to fit the module base. The deflecting prism is located outside the light-emitting port of the optical engine, and the PCB board is disposed on one side of the optical engine. The in-vehicle HUD device includes a housing, an optical waveguide disposed within the housing, and a compensating mirror. The housing is detachably connected to the light-emitting module. The light-emitting position of the deflecting prism in the light-emitting module corresponds to the coupling region of the optical waveguide. The optical engine is arranged parallel to the optical waveguide. The housing structurally cooperates with the optical waveguide and the compensating mirror to support and position them. This application features a compact structure, small size, simple assembly, and good stability.

Description

Technical Field

[0001] This application belongs to the field of head-up display technology and relates to a light-emitting module and its vehicle-mounted HUD device. Background Technology

[0002] A head-up display (HUD) is a device that projects vehicle-related information directly into the driver's field of vision. HUDs can reduce the frequency of looking down at the instrument panel or center console screen while driving, greatly improving driving comfort and safety.

[0003] Existing HUD devices have relatively small FOV and eyebox dimensions, and the images they produce only have one depth, making it difficult to effectively integrate complex road information with vehicle-mounted display information. The larger the eyebox area, or the larger the virtual image, the larger the head-up display device must be. Furthermore, current HUD systems using freeform surfaces as core optical elements are difficult to miniaturize, especially in AR-HUD applications requiring large field of view, large virtual image distance, and multiple depths. This severely hinders the expansion and iterative upgrades of traditional optical systems in HUD applications. Additionally, while one-dimensional arrayed waveguides are now widely used, they require a one-dimensional pupil expansion mechanism, resulting in a relatively large module size. If one-dimensional arrayed waveguides are used in HUDs, the pupil expansion mechanism also needs to increase proportionally with the waveguide size to achieve the same one-dimensional pupil expansion, thus negating the advantages of using waveguides in HUDs.

[0004] Two-dimensional arrayed waveguides significantly expand the eye-tracking range in HUD applications, enhancing safety and versatility. They enable a large field of view within a compact, ultra-thin space, freeing up cockpit design space. They provide a feasible technological path to achieve high-quality, full-color AR displays and have the potential for cost reduction through mass production. However, the various components in HUD devices, especially the waveguides and compensation lenses, are fixed by brackets, making assembly relatively complex and the structure not compact. Utility Model Content

[0005] The technical problem to be solved by this application is to provide a light-emitting module and a vehicle-mounted HUD device that are compact in structure, small in size, simple to assemble, and have good stability, in order to address the above-mentioned deficiencies of the prior art.

[0006] The technical solution adopted by this application to solve its technical problem is: to construct a light-emitting module for vehicle-mounted HUD devices, including an optical engine, a turning prism and a PCB board. The optical engine, the turning prism and the PCB board form an integral component through a module base. The optical engine, the turning prism and the PCB board are respectively matched with the shape of the module base. The turning prism is located outside the light outlet of the optical engine, and the PCB board is set on one side of the optical engine.

[0007] Furthermore, in the light-emitting module for the vehicle-mounted HUD device, the module base is preferably an integral structure or a fixed connection structure with an opening on one side and a fixed inner cavity, and the fixed inner cavity includes at least a turning prism fixing part and an optomechanical fixing part.

[0008] Furthermore, in the light-emitting module for the vehicle-mounted HUD device, the turning prism is preferably tightly fitted and positioned against the inner wall and / or bottom of the turning prism fixing part.

[0009] Furthermore, in the light-emitting module for the vehicle-mounted HUD device, preferably, a prism positioning member is provided on the inner side wall and / or bottom of the prism fixing part, and the prism is tightly fitted and positioned in the prism fixing part by the prism positioning member.

[0010] A vehicle-mounted HUD device includes a housing, an optical waveguide and a compensation mirror disposed within the housing. The housing is detachably connected to a light-emitting module, and the light-emitting position of the turning prism in the light-emitting module corresponds to the coupling region of the optical waveguide. The optomechanical system is arranged parallel to the optical waveguide. The housing is structurally designed to cooperate with the optical waveguide and the compensation mirror to support and position the optical waveguide and the compensation mirror.

[0011] Furthermore, in the aforementioned vehicle-mounted HUD device, the light-emitting module is preferably the light-emitting module described in the aforementioned technical solution.

[0012] Furthermore, in the aforementioned vehicle-mounted HUD device, the housing preferably includes a top cover and a base, and the base is provided with multiple steps to support the optical waveguide and the compensation mirror, so that the optical waveguide and the compensation mirror can be directly stacked and assembled.

[0013] Furthermore, in the aforementioned vehicle-mounted HUD device, the optical waveguide preferably includes a partially stacked first pupil-expanding optical waveguide and a second pupil-expanding optical waveguide. The bottom surface of the base is a stepped bottom surface, forming a lower first step and an upper second step. The first step accommodates and positions the first pupil-expanding optical waveguide, and the second step accommodates and positions the second pupil-expanding optical waveguide. The height difference between the first step and the second step satisfies the requirement that a safe gap is left between the first pupil-expanding optical waveguide and the second pupil-expanding optical waveguide after assembly.

[0014] Furthermore, in the aforementioned vehicle-mounted HUD device, preferably, an optical waveguide positioning component is provided on the inner side wall and / or bottom of the base, and the first pupil-expanding optical waveguide and the second pupil-expanding optical waveguide are respectively tightly fitted and positioned by the optical waveguide positioning component.

[0015] Furthermore, in the aforementioned vehicle-mounted HUD device, preferably, a third step is provided on each of the two sides of the upper part of the base, and the compensation mirror is placed and positioned on the third step. The height difference between the second step and the third step satisfies the requirement that a safe gap is left between the compensation mirror and the second pupil waveguide after assembly.

[0016] Furthermore, in the aforementioned vehicle-mounted HUD device, preferably, a compensating mirror positioning component is provided on the third step, and the compensating mirror is positioned and fixed on the third step by the compensating mirror positioning component.

[0017] Furthermore, in the aforementioned vehicle-mounted HUD device, the compensation mirror positioning component preferably includes a main positioning post and an anti-rotation positioning post respectively provided on the third step on both sides, and a positioning hole and a positioning groove are provided on the corresponding compensation mirror, which cooperate with the main positioning post and the anti-rotation positioning post for positioning.

[0018] Furthermore, in the aforementioned vehicle-mounted HUD device, preferably the upper cover is provided with a cover light-emitting port corresponding to the light-emitting position of the compensation mirror, and the cover light-emitting port is covered with a transparent dustproof film.

[0019] Implementing this application has the following beneficial effects:

[0020] The light-emitting module for automotive HUD devices disclosed in this application requires no bracket; instead, the various components within the light-emitting module are directly integrated into a single assembly via a module base. The cavity of the module base serves as the assembly carrier for the optomechanical system, the deflecting prism, and the PCB board. This application enables the creation of modular, universal components suitable for various automotive HUD devices with different structures. It achieves a compact structure, simplifies the manufacturing process, and reduces product costs.

[0021] The vehicle-mounted HUD device of this application adopts modular light-emitting modules for direct assembly, which simplifies the production process. In addition, it eliminates the assembly brackets for each component and directly positions and fixes the optical waveguide and compensation mirror through the shell structure. This makes the structure more compact and reduces the volume, and allows for more precise positioning and assembly, resulting in more accurate cooperation between the components. Attached Figure Description

[0022] To more clearly illustrate the technical solution of this application, the following description will be provided in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this application and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0023] Figure 1 This is a schematic diagram of the front structure of the light-emitting module in Embodiment 1 of this application;

[0024] Figure 2 This is a schematic diagram of the back structure of the light-emitting module in Embodiment 1 of this application;

[0025] Figure 3 This is a perspective view of the light-emitting module in Embodiment 1 of this application;

[0026] Figure 4 This is a partial enlarged view of the module base in Embodiment 1 of this application;

[0027] Figure 5 This is a schematic diagram of the external structure of the vehicle-mounted HUD device in Embodiment 2 of this application;

[0028] Figure 6 This is an exploded view of the vehicle-mounted HUD device in Embodiment 2 of this application;

[0029] Figure 7 This is a perspective view of the assembly of the light-emitting module and the base in Embodiment 2 of this application;

[0030] Figure 8 This is a schematic diagram of the front structure of the vehicle-mounted HUD device in Embodiment 2 of this application;

[0031] Figure 9 This is Embodiment 2 of this application. Figure 8 MM section view;

[0032] Figure 10 This is a schematic diagram of the base structure of the vehicle-mounted HUD device in Embodiment 2 of this application;

[0033] Figure 11 This is a schematic diagram of the base of the vehicle-mounted HUD device in Embodiment 2 of this application from another direction;

[0034] Figure 12 This is a schematic diagram of the front structure of the vehicle-mounted HUD device in Embodiment 2 of this application;

[0035] Figure 13 This is Embodiment 2 of this application. Figure 12 Enlarged view of a section at point N in the middle;

[0036] Figure 14 This is Embodiment 2 of this application. Figure 12 Enlarged view of a section at point E in the middle. Detailed Implementation

[0037] To provide a clearer understanding of the technical features, objectives, and effects of this application, the specific embodiments of this application are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this application.

[0038] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, that component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0039] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0040] Example 1, as Figure 1-4 As shown, a light-emitting module 100 for an in-vehicle HUD device includes an optomechanical unit 130, a deflecting prism 120, and a PCB board. The optomechanical unit 130, the deflecting prism 120, and the PCB board 140 are the basic structures that make up the light-emitting module 100. The structure and electrical connection mode of these three components can adopt existing technologies, and will not be described in detail here.

[0041] The difference between this application and the prior art is that the optical engine 130, the turning prism 120, and the PCB board 140 are formed into an integral component through the module base 110. The optical engine 130, the turning prism 120, and the PCB board 140 are all shaped to fit the module base 110. Specifically, the turning prism 120 is located outside the light outlet of the optical engine 130, and the PCB board 140 is positioned on one side of the optical engine 130. The aforementioned shape fit refers to the fact that the various components in the light-emitting module 100 are no longer fixed to the optical engine 130, the turning prism 120, and the PCB board 140 by brackets. Instead, the cavity of the module base 110 serves as the assembly carrier for the optical engine 130, the turning prism 120, and the PCB board 140. This reduces the overall volume of the light-emitting module and allows for the formation of an integral component directly through the module base 110 without the need for brackets. This modular, universal component can be directly used in various vehicle-mounted HUD devices with different structures. The bracketless design achieves a compact structure, simplifies the manufacturing process, and reduces product costs.

[0042] The module base 110 serves as a load-bearing base. Its shape is required to match the shape characteristics of each component to position and fix each component. In addition, it can also be combined with other components to form other products.

[0043] like Figure 1-3 As shown, for the sake of a compact structure, the module base 110 is an integral structure or a fixed connection structure with an opening on one side and a fixed inner cavity. Its fixed inner cavity includes at least a turning prism fixing part 111 and an optomechanical fixing part 112. That is, the turning prism fixing part 111 can directly position the turning prism 120, and the optomechanical fixing part 112 can directly position and fix the optomechanical 130. The opening of the module base 110 can be a whole surface or a partial opening. The position of the partial opening is directly opposite the light output position of the turning prism 120.

[0044] The module base 110 can be a one-piece molded structure, or it can be composed of separately manufactured parts that are fixedly connected or detachably connected to form a whole structure.

[0045] The specific shape of the module base 110 is not limited. For a more compact overall device, the module base 110 can be designed to match the assembled structures, meaning its structure and shape are determined by its internal structure. In this embodiment, the main components are the optical engine 130 and the turning prism 120. The functions of the turning prism fixing part 111 and the optical engine fixing part 112 are to support, position, and fix the optical engine 130 and the turning prism 120, respectively. The shapes of the turning prism fixing part 111 and the optical engine fixing part 112 are designed to match the shapes of the optical engine 130 and the turning prism 120, respectively. The optical engine 130 includes an optical engine body 131 and a heat sink 132. The various components of the optical engine body 131 can be assembled to form a cuboid structure, a polyhedral structure, etc., which, in conjunction with the component shapes, form the optical engine fixing part 112. The prism fixing part 111, in conjunction with the shape of the turning prism 120, can be a cuboid, a tetrahedron, a rhombus, etc.

[0046] Each component of the optical engine body 131 can be directly fixed within the optical engine fixing part 112, secured to the side wall or bottom surface by screws. Alternatively, the optical engine body 131 can be formed as a single integral structure, with the shape of the optical engine fixing part 112 matching the shape of the optical engine body 131. This means there is a clearance fit between the optical engine body 131 and the optical engine fixing part 112, and they are secured by optical engine positioning components. These positioning components can be located on the side wall of the optical engine fixing part 112 within the module base 110, or on the bottom surface of the optical engine fixing part 112. The positioning components can be columnar, dot-shaped, sheet-like, block-shaped, or other structural forms; they only need to be able to clamp onto the outer wall of the optical engine 130 to position it. In this embodiment, each component of the optical engine body 131 is directly fixed with screws at multiple locations, or fixed within the optical engine fixing part 112 of the module base 110 using fixing plates or similar devices. The optical engine body 131 is connected to a heat sink 132. An opening is provided in the module base 110 corresponding to the heat sink 132. The heat sink 132 is placed outside the module base 110 and connected to the optical engine body 131 through the opening. Placing the heat sink 132 on the outside can improve heat dissipation performance and reduce the size of the corresponding module base 110.

[0047] like Figure 2-3As shown, the PCB board 140 has a plate-like structure. If the size of the PCB board 140 matches the size of the optical engine 130, it can be mounted on one side of the optical engine 130, sharing the optical engine fixing part 112. If the size of the PCB board 140 cannot match the optical engine 130, the fixing cavity of the module base 110 can be provided with a PCB board fixing part 113 on the side of the optical engine 130. In this case, the PCB board fixing part 113 is only used to accommodate the PCB board 140, and this part of the structure is a flat structure to reduce the overall size. The module base 110 is provided with a terminal opening 141 for the PCB board 140, which is used to connect to the automotive cabin wiring harness to provide power and signal transmission.

[0048] The pivot prism 120 is tightly fitted and positioned against the inner wall and / or bottom of the pivot prism fixing part 111. There are various ways to achieve this tight fit and positioning. It can be a direct tight fit between the pivot prism 120 and the pivot prism fixing part 111, meaning that at least a portion of the pivot prism 120 and the pivot prism fixing part 111 are tightly fitted and positioned against each other. For example, the edge of the pivot prism 120 can be tightly fitted and positioned against the surrounding walls of the pivot prism fixing part 111. The specific abutment position is not limited; any positioning is acceptable.

[0049] In addition to the methods mentioned above, such as Figure 3-4 As shown, in this embodiment, a prism positioning member 121 is preferably provided on the inner wall and / or bottom of the prism fixing part 111. The prism positioning member 121 tightly fits and abuts against the prism fixing part 111 to position the prism 120. The prism positioning member 121 can be of various structural forms such as dispersed columnar, dot-shaped, sheet-shaped, block-shaped, and grid-shaped. It only needs to be set to clamp the outer wall surface of the prism 120 and position the prism 120. To facilitate the insertion of the prism 120, a guide part 1211 is provided at the top of the prism positioning member 121 on the inner wall. The guide part 1211 can be chamfered, curved, or inclined. The prism 120 is fixed by a curing agent bonding method, such as UV curing adhesive, or other suitable adhesives, which will not be described in detail here.

[0050] The deflection prism 120 is used to deflect the light emitted from the optical engine 130 by 90°, so that the optical engine 130 system can be arranged parallel to the optical waveguide, resulting in a more compact structure and smaller product size.

[0051] Example 2, as Figure 5-14As shown, a vehicle-mounted HUD device includes a housing 200, an optical waveguide 300 disposed within the housing 200, and a compensating mirror 400. The housing 200 is detachably connected to a light-emitting module 100, and the light-emitting position of the turning prism 120 in the light-emitting module 100 corresponds to the coupling region of the optical waveguide 300. Structurally, the housing 200 cooperates with both the optical waveguide 300 and the compensating mirror 400 to support and position them. This application can utilize the modular light-emitting module 100 of Embodiment 1 for direct assembly, simplifying the manufacturing process. Furthermore, it eliminates the need for assembly brackets for individual components, directly positioning and fixing the optical waveguide 300 and the compensating mirror 400 through the housing 200 structure. This results in a more compact structure, reduced volume, and more precise positioning and assembly, leading to more accurate cooperation between components.

[0052] In the aforementioned vehicle-mounted HUD device, the light-emitting module 100 can be selected from various existing structures, namely, a structure with an optical engine 130, a deflecting prism 120, and a PCB board 140. The optical engine 130 (Light Engine) is the core optical module in the head-up display (HUD) system, responsible for generating a high-brightness image light source, which is then projected onto the windshield or combiner through an optical system to form a virtual image visible to the driver. Its performance directly determines the brightness, contrast, resolution, and color performance of the HUD. The deflecting prism 120 changes the direction of light propagation, folding the light path, thereby achieving a more compact design within a limited space and increasing the freedom of optical design. The image light source emitted by the optical engine 130 is coupled into the optical waveguide 300 after passing through the deflecting prism 120. The PCB board 140 is used to control the operation of the optical engine 130. This embodiment preferably uses the light-emitting module 100 of Embodiment 1. Compared with the prior art, this application changes the assembly mode of the optical engine 130, deflecting prism 120, and PCB board 140 structures, directly forming the three into a single integrated structure.

[0053] Specifically, such as Figure 6 As shown, the housing 200 includes a top cover 220 and a base 210. The base 210 has multiple steps to support the optical waveguide 300 and the compensating mirror 400, allowing the optical waveguide 300 and the compensating mirror 400 to be directly stacked and assembled. The two are connected by a snap-fit ​​seal, and can be dustproof and waterproof through the external stop.

[0054] like Figure 7 As shown, the entire light-emitting module 100 is assembled onto the base 210 using positioning posts and screws. It also integrates the screws with the PCB board, reducing the number of mounting screws by two, and features a dustproof and waterproof design with appropriate stop edges. The optomechanical component in the light-emitting module 100 of this application can be arranged parallel to the optical waveguide, resulting in a more compact structure and smaller product size.

[0055] like Figure 5-6 As shown in Figures 9-11, different vehicle-mounted HUD devices select different optical waveguides 300. The optical waveguide 300 can be a one-dimensional optical waveguide or a two-dimensional optical waveguide. In this embodiment, a two-dimensional optical waveguide is preferred, that is, the optical waveguide 300 includes a partially stacked first pupil-expanding optical waveguide 310 and a second pupil-expanding optical waveguide 320. The positioning and fixing method of the first pupil-expanding optical waveguide 310 and the second pupil-expanding optical waveguide 320 is stepped, that is, the bottom surface of the base 210 is a stepped bottom surface, forming a lower first step 211 and an upper second step 212, wherein the first step 211 accommodates and positions the first pupil-expanding optical waveguide 310, and the second step 212 accommodates and positions the second pupil-expanding optical waveguide 320. In this embodiment, the first pupil-expanding waveguide 310 is located at the bottom and is disposed on one side of the base 210. The bottom surface of the base 210 has an opening 2113. The deflecting prism 120 deflects the light emitted from the optical engine 130 system by 90° and then enters the first pupil-expanding waveguide 310 through this opening 2113. The opening 2113 is located at one corner of the bottom surface of the base 210, with the deflecting prism 120 below it. Stacked on top of the first pupil-expanding waveguide 310 is the second pupil-expanding waveguide 320, which serves as the second step 212 to support the second pupil-expanding waveguide 320 and maintain a safe gap between the first pupil-expanding waveguide 310 and the second pupil-expanding waveguide 320. The height difference between the first step 211 and the second step 212 satisfies the condition that a safe gap remains between the first pupil-expanding waveguide 310 and the second pupil-expanding waveguide 320 after assembly. The stacking method of the first pupil-expanding waveguide 310 and the second pupil-expanding waveguide 320 and the optical path system design can be obtained through actual calculations and will not be elaborated here.

[0056] In other embodiments, for a one-dimensional optical waveguide, the bottom surface and sidewalls of the base can be provided with two levels of steps, which are used to support the optical waveguide and the compensation mirror respectively. The height difference between the two levels of steps satisfies the requirement that a safe gap is left between the optical waveguide and the compensation mirror after assembly.

[0057] like Figure 10-11 As shown, the bottom surface of the base 210 is provided with only a first step 211 and a second step 212 to support the first pupil-expanding waveguide 310 and the second pupil-expanding waveguide 320. The positioning and fixing of the first pupil-expanding waveguide 310 and the second pupil-expanding waveguide 320 are respectively: the inner sidewall and / or bottom of the base 210 are provided with waveguide positioning members 2121, and the first pupil-expanding waveguide 310 and the second pupil-expanding waveguide 320 are respectively tightly fitted and positioned by the waveguide positioning members 2121.

[0058] like Figure 10-11As shown, the first pupil-expanding optical waveguide 310 and the second pupil-expanding optical waveguide 320 are positioned within the base 210 by the optical waveguide positioning component 2121. The optical waveguide positioning component 2121 can be of various structural forms such as dispersed columnar, dot-shaped, sheet-shaped, or block-shaped, as long as it can clamp the outer wall surfaces of the first pupil-expanding optical waveguide 310 and the second pupil-expanding optical waveguide 320 after installation, thus positioning the first pupil-expanding optical waveguide 310 and the second pupil-expanding optical waveguide 320. The first pupil-expanding optical waveguide 310 and the second pupil-expanding optical waveguide 320 are fixed by adhesive bonding with a curing agent. Adhesive is applied around the first pupil-expanding optical waveguide 310 and the second pupil-expanding optical waveguide 320, for example, UV-curable adhesive or other suitable adhesives can be used, which will not be elaborated here. The preferred optical waveguide positioning component 2121 has a guide portion 2121a on its top. The guide portion 2121a has a chamfered, arc surface, or beveled structure, which facilitates the placement of the first pupil-expanding optical waveguide 310 and the second pupil-expanding optical waveguide 320. In particular, the optical waveguide positioning component 2121 with the guide portion 2121a on its top is provided on the side wall of the first step 211, which is beneficial for placing the first pupil-expanding optical waveguide 310 on the first step 211.

[0059] In addition, the bottom surface of the base 210 is provided with an optical waveguide positioning component 2121, which can make the first pupil-expanding optical waveguide 310 and the second pupil-expanding optical waveguide 320 form a safe gap with the bottom surface of the base 210 respectively. The optical waveguide positioning component 2121 provided on the bottom surface can adopt various structural forms such as grid, dispersed dot, and dispersed block. This embodiment does not limit it.

[0060] like Figure 10-11 As shown, the upper part of the base 210 has three third steps 213 on both sides. The compensation mirror 400 is placed and positioned on the third steps 213. The height difference between the second step 212 and the third step 213 satisfies the requirement that a safe gap is left between the compensation mirror 400 and the second pupil-expanding waveguide 320 after assembly. Since the compensation mirror 400 is located above the second pupil-expanding waveguide 320, the third steps 213 can only be set on both sides of the upper part of the base 210. This is also to maintain a safe gap between the compensation mirror 400 and the second pupil-expanding waveguide 320 after assembly. The position of the third steps 213 is determined according to the thickness and position of the compensation mirror 400 and the second pupil-expanding waveguide 320. The specific position between the compensation mirror 400 and the second pupil-expanding waveguide 320 can be set according to actual needs. The compensation mirror 400 covers the light-emitting position of the second pupil-expanding waveguide 320.

[0061] like Figure 10-14As shown, a compensating mirror positioning component is also provided on the third step 213, and the compensating mirror 400 is positioned and fixed on the third step 213 by the compensating mirror positioning component. The compensating mirror positioning component includes a main positioning post 2132 and an anti-rotation positioning post 2131 respectively provided on both sides of the third step 213. Positioning holes 402 and positioning grooves 401 are provided on the edges of the compensating mirror 400, which cooperate with the main positioning post 2132 and the anti-rotation positioning post 2131 for positioning. The positioning groove 401 is a semi-circular groove or a semi-elliptical groove. The corresponding anti-rotation positioning post 2131 is a cross-shaped column, a straight column, etc. The outer edge of the anti-rotation positioning post 2131 fits against the wall of the positioning groove 401 to prevent the compensating mirror 400 from rotating. After assembly, the compensating mirror 400 cannot move forward, backward, left, or right, nor can it rotate. The compensating mirror 400 can be fixed by adhesive or by UV-cured adhesive to the base 210.

[0062] The multi-stage stepped structure employed in this application enables the stacking, positioning, and fixation of the first pupil-expanding waveguide 310, the second pupil-expanding waveguide 320, and the compensation mirror 400. This results in a compact structure and more precise positioning. It facilitates the transfer of larger waveguides into a smaller space, achieving a larger field of view (FOV) for the product, and avoids collisions due to vibrations, thus enabling high-precision assembly.

[0063] like Figure 5-6 As shown, the upper cover 220 has a cover light outlet 222 corresponding to the light outlet position of the compensation mirror 400, and the cover light outlet 222 is covered with a transparent dustproof film 230. It is attached with double-sided tape, which is dustproof and waterproof without affecting the light output of the system.

[0064] The base 210 can also be equipped with mounting feet, and the feet have screw holes and positioning posts for positioning and assembly onto the vehicle bracket, so as to realize the image projection onto the car windshield and realize the product function.

[0065] It is understood that the above embodiments only illustrate preferred embodiments of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this application. It should be noted that, for those skilled in the art, without departing from the concept of this application, the above technical features can be freely combined, and several modifications and improvements can be made, all of which fall within the protection scope of this application. Therefore, all equivalent transformations and modifications made within the scope of the claims of this application should fall within the coverage of the claims of this application.

Claims

1. A light emitting module for a vehicle-mounted HUD device, comprising a light engine, a turning prism and a PCB board, characterized in that, The optical engine, the deflection prism, and the PCB board are formed into an integral component through the module base. The optical engine, the deflection prism, and the PCB board are all shaped to fit the module base. The deflection prism is located outside the light outlet of the optical engine, and the PCB board is set on one side of the optical engine.

2. The light emitting module for a vehicle-mounted HUD device according to claim 1, characterized by, The module base is an integral structure or a fixed connection structure with an opening on one side and a fixed inner cavity. The fixed inner cavity includes at least a turning prism fixing part and an optomechanical fixing part.

3. The light emitting module for a vehicle-mounted HUD device according to claim 2, characterized by, The turning prism is tightly fitted and positioned against the inner wall and / or bottom of the turning prism fixing part.

4. The light emitting module for a vehicle-mounted HUD device according to claim 3, characterized by, The inner wall and / or bottom of the prism fixing part is provided with a prism positioning component, which is used to tightly fit and position the prism within the prism fixing part.

5. A vehicle-mounted HUD device comprising a housing, a light waveguide and a compensating mirror disposed in the housing, and a light emitting module detachably connected to the housing, characterized in that, The light-emitting position of the turning prism in the light-emitting module corresponds to the coupling region of the optical waveguide; the optomechanical system is arranged parallel to the optical waveguide; the housing is structurally designed to cooperate with the optical waveguide and the compensation mirror to support and position the optical waveguide and the compensation mirror.

6. The vehicle-mounted HUD device according to claim 5, characterized by The light-emitting module is the light-emitting module described in any one of claims 1-4.

7. The vehicle-mounted HUD device according to claim 5, characterized by The housing includes a top cover and a base. The base has multiple steps to support the optical waveguide and the compensation mirror, so that the optical waveguide and the compensation mirror can be directly stacked and assembled.

8. The vehicle-mounted HUD device according to claim 7, characterized by The optical waveguide includes a partially stacked first pupil-expanding optical waveguide and a second pupil-expanding optical waveguide. The bottom surface of the base is a stepped bottom surface, forming a lower first step and an upper second step. The first step accommodates and positions the first pupil-expanding optical waveguide, and the second step accommodates and positions the second pupil-expanding optical waveguide. The height difference between the first step and the second step satisfies the requirement that a safe gap is left between the first pupil-expanding optical waveguide and the second pupil-expanding optical waveguide after assembly.

9. The vehicle-mounted HUD device according to claim 8, characterized by The base is provided with an optical waveguide positioning component on its inner side wall and / or bottom position, and the first pupil-expanding optical waveguide and the second pupil-expanding optical waveguide are respectively tightly fitted and positioned by the optical waveguide positioning component.

10. The vehicle-mounted HUD apparatus according to claim 8, characterized by The upper part of the base is provided with a third step on each of the two sides. The compensation mirror is placed and positioned on the third step. The height difference between the second step and the third step satisfies the requirement that a safe gap is left between the compensation mirror and the second pupil dilator waveguide after assembly.

11. The vehicle-mounted HUD apparatus according to claim 10, characterized by The third step is provided with a compensating mirror positioning component, and the compensating mirror is positioned and fixed on the third step by the compensating mirror positioning component.

12. The vehicle-mounted HUD apparatus according to claim 11, characterized by The compensating mirror positioning component includes a main positioning post and an anti-rotation positioning post respectively set on the third step on both sides. The compensating mirror is provided with positioning holes and positioning grooves, which cooperate with the main positioning post and the anti-rotation positioning post for positioning.

13. The vehicle-mounted HUD apparatus according to claim 7, characterized by The upper cover has a light outlet corresponding to the light-emitting position of the compensating mirror, and the light outlet is covered with a transparent dustproof film.

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