Display system based on HUD

Abstract

The invention relates to the technical field of HUD display, and discloses a display system based on HUD.The system comprises an HUD reflecting film and projection equipment, and the HUD reflecting film is used for being attached to window glass of a target vehicle; the projection device is in communication connection with a target device and is used for projecting an image to the HUD reflecting film according to each target instruction sent by the target device; wherein when the application type corresponding to the target instruction is a navigation map, the HUD reflecting film is used for displaying a navigation image in a mirror image mode based on an image projected by the projection equipment, and when the application type corresponding to the target instruction is music, the HUD reflecting film is used for displaying the navigation image in a mirror image mode. And the HUD reflecting film is used for displaying lyric images in a mirroring manner based on the images projected by the projection equipment. Therefore, the technical problem that the HUD technology is difficult to popularize to middle and low-end vehicle models or old vehicle models is solved, and the entertainment function is expanded on the basis of basic functions of a traditional HUD.

Description

Technical Field

[0001] The present invention relates to the field of HUD display technology, and in particular to a HUD-based display system. Background Art

[0002] HUD (head-up display) technology, such as optical reflective HUD and optical waveguide HUD, has gradually become a standard feature of modern high-end cars because it can significantly improve driving safety and convenience (the driver does not need to look down at the instrument panel or central control screen). Systems that implement this type of technology usually require the vehicle to reserve a dedicated optical structure and layout space during the design phase, and are deeply integrated with the vehicle system, mainly used to project key driving information (such as vehicle speed, navigation instructions, etc.). However, existing HUD technology has obvious limitations: on the one hand, its high cost and complex installation requirements make it difficult to popularize it on mid- and low-end models or older models. These models usually lack dedicated HUD structures and the vehicle system performance is limited and the response is slow; on the other hand, the existing HUD functions are relatively simple and generally lack support for entertainment information. Summary of the Invention

[0003] Based on this, it is necessary to propose a HUD-based display system to address the technical problems that the existing HUD technology is difficult to popularize on mid- and low-end models or old models, and the existing HUD functions are relatively single and generally lack support for entertainment information.

[0004] In order to solve the above problems, the present application provides a HUD-based display system, which includes: a HUD reflective film and a projection device, wherein the HUD reflective film is used to be attached to the window glass of a target vehicle;

[0005] The projection device is in communication with the target device and is used to project an image onto the HUD reflective film according to various target instructions sent by the target device;

[0006] Among them, when the application type corresponding to the target instruction is a navigation map, the HUD reflective film is used to display the navigation image in a mirrored manner based on the image projected by the projection device; when the application type corresponding to the target instruction is music, the HUD reflective film is used to display the lyrics image in a mirrored manner based on the image projected by the projection device.

[0007] Furthermore, the projection device is integrated with a projection processing unit, and the projection processing unit is configured to implement the following steps:

[0008] Establishing a communication connection between the projection device and the target device as a first connection;

[0009] Based on the first connection, establishing a communication connection between the projection device and a first application running in the foreground of the target device as a target connection, wherein the application type of the first application is music or navigation map, and the running mode of the first application in the target connection is foreground running or background running;

[0010] Based on the target connection, obtaining the target instruction sent by the first application;

[0011] generating a target image according to the target instruction;

[0012] According to the target image, the projection device is controlled to project the image onto the HUD reflective film.

[0013] Furthermore, the steps of establishing, in the projection processing unit, a communication connection between the projection device and a first application running in the foreground of the target device based on the first connection as a target connection, and obtaining, based on the target connection, the target instruction sent by the first application, include:

[0014] Based on the first connection, a communication connection is established between the projection device and a first application running in the foreground of the target device and having an application type of music, as the target connection, and based on the target connection, the target instruction sent by the first application is obtained;

[0015] Based on the first connection, a communication connection is established between the projection device and the first application running in the foreground of the target device and whose application type is a navigation map. As a second connection, an MTU negotiation request is initiated to the first application based on the second connection using the API of the Bluetooth protocol stack to determine the MTU value, and the target connection is obtained. Based on the target connection, the target instruction sent by the first application is obtained according to the MTU value.

[0016] Furthermore, the step of generating a target image according to the target instruction in the projection processing unit includes:

[0017] Decoding the target instruction according to a decoding method corresponding to an application type corresponding to the target instruction to obtain decoded data;

[0018] If the application type of the first application is a navigation map, updating a navigation template according to the decoded data to obtain the target image;

[0019] If the application type of the first application is music, the lyrics template is updated according to the decoded data to obtain the target image.

[0020] Furthermore, the step of controlling the projection device to project an image onto the HUD reflective film according to the target image in the projection processing unit further includes:

[0021] Obtaining a first display brightness, wherein the first display brightness is the display brightness sent by the first application;

[0022] According to the target image and the first display brightness, the projection device is controlled to project an image onto the HUD reflective film.

[0023] Furthermore, the step of controlling the projection device to project an image onto the HUD reflective film according to the target image in the projection processing unit further includes:

[0024] Acquire a second display brightness, wherein the second display brightness is data automatically determined according to the ambient brightness of an environment in which the projection device is located;

[0025] According to the target image and the second display brightness, the projection device is controlled to project an image onto the HUD reflective film.

[0026] Furthermore, the step of controlling the projection device to project an image onto the HUD reflective film according to the target image in the projection processing unit further includes:

[0027] Acquire the target image at the same display moment as an image package;

[0028] If the application type corresponding to the image package does not include both music and navigation maps, controlling the projection device to project an image onto the HUD reflective film according to the image package;

[0029] If the application type corresponding to the image package includes music and navigation maps, the moving speed of the projection device is obtained, and a stitching template is obtained from a template library based on the moving speed. The image package is stitched according to the stitching template to obtain a stitched image. Based on the stitched image, the projection device is controlled to project the image onto the HUD reflective film.

[0030] Furthermore, the step of controlling the projection device to project an image onto the HUD reflective film according to the target image in the projection processing unit further includes:

[0031] Get the driver's fatigue status;

[0032] If the driver's fatigue state is within a preset state range, when projecting an image onto the HUD reflective film according to each target instruction sent by the target device, the image projected by the projection device does not include a lyrics image.

[0033] Furthermore, the projection device includes: a device controller, a display, an optical component, a communication component and a power supply component, and the device controller is integrated with the projection processing unit;

[0034] The device controller is used to control the operation of the display, the optical component, the communication component and the power supply component;

[0035] The power supply component is used to supply power to the device controller, the display, the optical component, and the communication component.

[0036] Furthermore, the power supply assembly is electrically connected to an onboard system of the target vehicle, and the onboard system charges the power supply assembly.

[0037] The HUD-based display system of this application achieves the following technical effects:

[0038] (1) This HUD-based display system helps solve the technical problem that HUD technology is difficult to popularize in mid- and low-end models or old models. From a cost-effectiveness perspective, the HUD reflective film and independent projection equipment it uses reduce costs, and have a price advantage over traditional integrated HUD equipment, alleviating the cost pressure of mid- and low-end models and old models. In terms of installation convenience, the method of applying the HUD reflective film to the car window glass and the communication connection between the projection equipment and the target device is simple and easy, without the need to modify the vehicle, breaking through the limitations of the original vehicle structure and installation technology, thereby increasing the possibility of HUD technology being popularized in these models.

[0039] (2) This HUD-based display system is effective in resolving the relatively limited functionality of existing HUDs and their lack of entertainment information support. On the multi-function display, it can display navigation images when the target command corresponds to a navigation map, and it can also display lyrics images when the target command corresponds to music. This expands the entertainment functions based on the basic functions of traditional HUDs and enhances the driving experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] in:

[0042] Figure 1 is a structural block diagram of a HUD-based display system in one embodiment;

[0043] Figure 2is a flowchart of a projection processing unit of a HUD-based display system in one embodiment;

[0044] Figure 3 FIG. 4 is a structural block diagram of a projection device of a HUD-based display system in one embodiment. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0046] See also Figure 1 As shown, Figure 1 An embodiment of the present invention provides a HUD-based display system, comprising: a HUD reflective film 2 and a projection device 1, wherein the HUD reflective film 2 is used to be attached to a window glass 3 of a target vehicle;

[0047] The projection device 1 is in communication with the target device and is used to project an image 11 onto the HUD reflective film 2 according to various target instructions sent by the target device;

[0048] Among them, when the application type corresponding to the target instruction is a navigation map, the HUD reflective film 2 is used to display the navigation image in a mirrored manner based on the image projected by the projection device 1; when the application type corresponding to the target instruction is music, the HUD reflective film 2 is used to display the lyrics image in a mirrored manner based on the image projected by the projection device 1.

[0049] The image 11 projected by the projection device 1 is reflected by the HUD reflective film 2 to form an image 22 .

[0050] The HUD reflective film 2 is a special optical film that can effectively reflect the light when the projection device 1 projects it.

[0051] The HUD reflective film 2 has high reflectivity and low scattering properties. It has a high reflectivity for light within a specific wavelength range emitted by the projection device 1. For example, it can efficiently reflect the visible light required to display navigation images or lyrics images, allowing the projected image to be clearly displayed. This ensures that the driver can clearly see the image content on the reflective film under different lighting conditions. During the light reflection process, light scattering is minimized. Severe light scattering can result in a blurred and unclear image. The HUD reflective film 2 uses special materials and processes to reflect light in a predetermined direction, thereby ensuring image clarity and accuracy.

[0052] The HUD reflective film 2 has excellent adhesion, allowing it to adhere tightly to the vehicle window glass 3. This adhesion not only ensures optical performance but also significantly impacts the normal functions of the vehicle window glass 3 (such as light transmittance and field of view). Furthermore, the HUD reflective film 2 adapts to the shape and curvature of the vehicle window glass 3, ensuring optimal display performance on windows of varying shapes. The HUD reflective film 2 remains stable under various environmental conditions, including temperature and humidity. For example, it will not deform or debond in high-temperature environments, and its optical performance will not be affected in humid environments.

[0053] Target devices can be mobile phones, tablets, smart wearable devices (such as smart watches, smart bracelets, smart badges, etc.) and in-vehicle systems.

[0054] The projection device 1 and the target device are communicatively connected via wired communication technology and / or wireless communication technology.

[0055] In terms of wired communication technology, USB (Universal Serial Bus) connection can be used, which can provide stable data transmission. For example, through the Type-C (USB interface form factor standard) interface, images, instructions and other data in the target device can be transmitted to the projection device 1 at high speed, ensuring the timeliness and accuracy of the display.

[0056] In terms of wireless communication technology, Bluetooth technology is a common choice. The projection device 1 and the target device can be paired via Bluetooth to establish a relatively stable short-range communication connection, which is suitable for transmitting some simple control instructions or basic image data. Wi-Fi (mobile hotspot) technology can also be used to connect the two. It can provide a larger bandwidth and a longer transmission distance. When the target device needs to transmit larger files, such as high-definition video content or complex map images to the projection device 1, Wi-Fi can meet the needs of high-speed data transmission, so that the projection device 1 can accurately project the corresponding navigation image, lyrics image and other images 11 according to the instructions of the target device, and the HUD reflective film 2 can accurately display the corresponding navigation image, lyrics image and other images 22.

[0057] The HUD reflective film 2 is used to be attached to the window glass 3 of the target vehicle. The projection device 1 is placed inside the vehicle, and the image projected by the projection device 1 is located inside the HUD reflective film 2 .

[0058] It can be understood that when the projection device 1 is communicatively connected with the target device, the application in the target device sends a target instruction to the target device, and the projection device 1 parses and projects the received target instruction and controls the projection component in the projection device 1 to project an image.

[0059] It is understandable that the formats of target instructions sent to target devices by different applications may be the same or different.

[0060] When the application type corresponding to the target instruction is a navigation map, that is, the application sent to the target instruction is a navigation map application.

[0061] When the application type corresponding to the target instruction is music, that is, the application sent to the target instruction is a music application.

[0062] Optionally, the navigation map application and / or music application in the target device is directly connected to the projection device 1, the navigation map application sends a target instruction to the projection device 1 for connection, and the music application sends a target instruction to the projection device 1 for connection.

[0063] Optionally, a processing application is integrated into the target device and connected to the projection device 1. The processing application obtains data from the navigation map application, packages a target instruction based on the obtained data, and sends the target instruction to the projection device 1. The processing application obtains data from the music application, packages a target instruction based on the obtained data, and sends the target instruction to the projection device 1.

[0064] When the projection device 1 projects an image onto the HUD reflective film 2 according to each target instruction sent by the target device, the image projected by the projection device 1 includes a navigation image and / or a lyrics image.

[0065] This embodiment achieves the following technical effects:

[0066] (1) This HUD-based display system helps solve the technical problem that HUD technology is difficult to popularize in mid- and low-end models or old models. From a cost-effectiveness perspective, the HUD reflective film 2 and independent projection device 1 it uses reduce costs and have a price advantage over traditional integrated HUD devices, alleviating the cost pressure of mid- and low-end models and old models. In terms of installation convenience, the HUD reflective film 2 is applied to the car window glass 3, and the projector 1 communicates and connects with the target device in a simple and easy manner. There is no need to modify the vehicle, breaking through the limitations of the original vehicle structure and installation technology, thereby increasing the possibility of HUD technology being popularized in these models.

[0067] (2) This HUD-based display system is effective in resolving the relatively limited functionality of existing HUDs and their lack of entertainment information support. On the multi-function display, it can display navigation images when the target command corresponds to a navigation map, and it can also display lyrics images when the target command corresponds to music. This expands the entertainment functions based on the basic functions of traditional HUDs and enhances the driving experience.

[0068] (3) The projection device 1 is compatible with a variety of target devices and can utilize the rich application resources of the target devices. In theory, as long as the application can send appropriate instructions, it can be displayed, which greatly expands the functional scope of the HUD system.

[0069] See also Figure 2 As shown, in one embodiment, the projection device 1 is integrated with a projection processing unit, and the projection processing unit is configured to implement the following steps:

[0070] S121: Establishing a communication connection between the projection device 1 and the target device as a first connection;

[0071] Specifically, a communication connection between the projection device 1 and the target device is successfully established through wired communication technology and / or wireless communication technology, and the communication connection is used as the first connection.

[0072] S122: Establishing a communication connection between the projection device 1 and a first application running in the foreground of the target device based on the first connection as a target connection, wherein the application type of the first application is music or navigation map, and the running mode of the first application in the target connection is foreground running or background running;

[0073] Foreground running refers to a state in which a program (ie, a first application) is running in a device (target device) in a manner directly visible to a user.

[0074] Background running refers to a state in which a program (ie, the first application) is running in a device (target device) in a manner that is not directly visible to the user.

[0075] It is understood that navigation map applications have a basic map call function for developers to use. After obtaining authorization, the operator of the navigation map application will provide an SDK (Software Development Kit) for calling the navigation map application. This allows users to open the navigation map application without manually setting up the basic map call function. The navigation map application can be called whether it is running in the foreground or the background.

[0076] Specifically, during the duration of the first connection, the user opens the first application on the target device. At this time, the first application is running in the foreground, and a communication connection is established between the projection device 1 and the first application running in the foreground of the target device, and the communication connection is used as the target connection.

[0077] It is understandable that after the communication connection between the projection device 1 and the first application running in the foreground of the target device is established, the first application can be run in the foreground or in the background.

[0078] It is understandable that the first application may also be a processing application that obtains data from a navigation map application or a music application in the target device.

[0079] S123: Based on the target connection, obtain the target instruction sent by the first application;

[0080] Specifically, during the duration of the target connection, the first application sends the target instruction to the projection device 1 .

[0081] S124: generating a target image according to the target instruction;

[0082] Specifically, the target instruction is parsed, and an image to be projected is determined based on the parsing, and the image is used as the target image.

[0083] Optionally, the target instruction is parsed to obtain an image, and the parsed image is used as the target image, or the parsed image is processed (eg, resolution adjustment, color processing, etc.) and used as the target image.

[0084] Optionally, the target instruction is parsed to obtain text data, an image is generated according to the text data, and the generated image is used as the target image.

[0085] S125 : According to the target image, controlling the projection device 1 to project an image onto the HUD reflective film 2 .

[0086] The projection device 1 includes: a device controller 12, a display 13, an optical component 14, and a communication component 15. The device controller 12 is integrated with the projection processing unit; the device controller 12 is used to control the operation of the display 13, the optical component 14, and the communication component 15.

[0087] In the projection device 1, the device controller 12 integrates a projection processing unit. When controlling the projection device 1 to project an image onto the HUD reflective film 2 based on a target image, the device controller 12 plays a key role. After obtaining information related to the target image from the projection processing unit, the device controller 12 begins controlling the display 13. It sends instructions to the display 13, causing it to display the image content corresponding to the target image.

[0088] Next, the device controller 12 controls the optical component 14 to perform optical processing on the image displayed by the display 13 , such as adjusting the direction and focus of the light, so that the light can accurately hit the HUD reflective film 2 .

[0089] The projection processing unit in the projection device 1 of this embodiment establishes a first connection with the target device, and then establishes a target connection with the first music or navigation map application running in the foreground of the target device. This connection method allows the first application to maintain communication regardless of whether it is running in the foreground or the background. Through the target connection, the projection processing unit can obtain the target instruction sent by the first application, and then generate a target image based on the instruction, and finally control the projection device 1 to project the image onto the HUD reflective film 2 according to the target image. In this way, efficient communication and collaborative work can be achieved between the projection device 1 and the specific application in the target device, and the corresponding image can be accurately generated and projected according to the instructions of the application. For example, in the navigation map application scenario, an accurate navigation image can be projected onto the HUD reflective film 2, or lyrics images related to music can be projected in the music application scenario, etc., thereby improving the user experience and operational convenience.

[0090] In one embodiment, the steps of establishing, in the projection processing unit, a communication connection between the projection device 1 and a first application running in the foreground of the target device based on the first connection as a target connection, and obtaining, based on the target connection, the target instruction sent by the first application, include:

[0091] S1221: Establishing, based on the first connection, a communication connection between the projection device 1 and a first application running in the foreground of the target device and of the music application type as the target connection, and acquiring, based on the target connection, the target instruction sent by the first application;

[0092] First, projector device 1, based on the existing first connection, identifies the first music application currently running in the foreground on the target device. Next, a communication connection is directly established between projector device 1 and the first music application, defining this communication connection as the target connection. Finally, leveraging this established target connection, projector device 1 can successfully receive target commands sent by the first music application, enabling command interaction between the two applications for music-related functions.

[0093] S1222: Based on the first connection, a communication connection is established between the projection device 1 and the first application running in the foreground of the target device and whose application type is a navigation map. As a second connection, an MTU negotiation request is initiated to the first application based on the second connection using the API of the Bluetooth protocol stack to determine the MTU value, and the target connection is obtained. Based on the target connection, the target instruction sent by the first application is obtained according to the MTU value.

[0094] Specifically, first, the projection device 1 uses the existing first connection to establish a communication connection with the first application that is running in the foreground of the target device and whose application type is a navigation map, and defines this communication connection as a second connection. Then, with the help of the second connection, the projection device 1 uses the API of the Bluetooth protocol stack to initiate an MTU (maximum transmission unit) negotiation request to the first application. In this process, the appropriate MTU value is determined through the interaction between the two parties to obtain the final target connection. Finally, based on this target connection containing the determined MTU value, the projection device 1 can accurately obtain the target instruction sent by the first application, thereby completing the instruction acquisition and interaction based on specific parameters with the navigation map application.

[0095] Optionally, the first application of the navigation map application type sends a target instruction to the projection device 1 via the Bluetooth protocol, and the target instruction carries information such as vehicle speed and interval speed measurement. The text encoding involved in the protocol adopts the UTF-8 format.

[0096] In this embodiment, for the first application whose application type is music, a target connection is established based on the first connection to obtain the target instruction. This method simply and directly realizes the communication and instruction acquisition between the projection device 1 and the music application, which is convenient for image projection and other operations in related scenarios. For the first application of the navigation map type, after the second connection is established based on the first connection, an MTU negotiation request is initiated by using the API of the Bluetooth protocol stack to determine the MTU value to obtain the target connection, and then the target instruction is obtained based on the MTU value. This process utilizes the characteristics of the Bluetooth protocol stack and can more accurately and efficiently obtain the instructions sent by the navigation map application based on the determined MTU value, ensuring that the projection device 1 can accurately generate and project images according to the instructions in scenarios such as navigation, and overall improves the accuracy, efficiency and adaptability of the communication between the projection device 1 and different types of applications.

[0097] In one embodiment, the step of generating a target image according to the target instruction in the projection processing unit includes:

[0098] S1241: Decode the target instruction according to a decoding method corresponding to the application type corresponding to the target instruction to obtain decoded data;

[0099] Since different applications have different instruction formats, in this embodiment, the target instruction is decoded according to a decoding method corresponding to the application type corresponding to the target instruction, and the decoded data is used as decoded data.

[0100] S1242: If the application type of the first application is a navigation map, updating a navigation template according to the decoded data to obtain the target image;

[0101] A navigation template is a pre-designed framework structure used for generating images or displaying information related to navigation maps.

[0102] In a navigation system, a navigation template usually contains some fixed elements and layout rules. For example, it may contain the basic layout of the map display area, such as the display position of the scale, the style and position of the direction indicator, etc. It may also specify the display method of different types of geographic information (such as roads, landmarks, points of interest, etc.), such as using specific icons, colors or lines to represent different levels of roads. This template provides the basis for updating according to the decoded data. By filling the decoded navigation-related data into this template or adjusting the elements in the template according to the data, a target image suitable for navigation needs can be generated.

[0103] First, the navigation template can be the default setting of the projection device 1 when it leaves the factory. During the production process of the device, the manufacturer pre-sets one or more sets of navigation templates based on the analysis of the user's common navigation needs. These default navigation templates often have universal and basic navigation function displays. For example, the default map display scale, basic navigation icon styles (such as icons representing the starting point, end point, and waypoints), conventional route color identification (such as yellow for main roads, gray for side roads, etc.) and default text prompt style (font, font size, color, etc.), which allow users to perform basic navigation operations when using the device for the first time.

[0104] Secondly, the navigation template can also be set through a client that is in communication with the projection device 1. With the development of smart devices, the projection device 1 can connect and interact with clients such as mobile phones and tablets. On the client, users can deeply customize the navigation template according to their own personalized needs. For example, users can choose from a variety of map theme styles on the client, such as a fresh-style map template, where the entire map interface is dominated by light blue and green, giving people a comfortable visual experience; or choose a dark theme with a full sense of technology, with routes and icons with cool light and shadow effects. In addition, the level of detail of the navigation information can also be set on the client, such as displaying more detailed information on surrounding points of interest (such as restaurants, gas stations, parking lots, etc.), including their reviews, business hours, etc., and the display position and method of this information in the navigation template can be adjusted.

[0105] Finally, the navigation template can also be selected by the user through the buttons of the projection device 1. The projection device 1 itself is equipped with some function buttons, and the user can directly operate these buttons to switch between several navigation templates preset in the device. This method is convenient and is very practical when there is no client connected or the navigation template needs to be adjusted quickly. For example, when the user is driving and suddenly feels that the map display of the current navigation template is not clear enough and wants to switch to another template with a simpler display and more prominent road signs, the switch can be quickly completed through the buttons on the device without having to operate other devices or go through complicated setup processes.

[0106] S1243: If the application type of the first application is music, update the lyrics template according to the decoded data to obtain the target image.

[0107] A lyrics template is a pre-set framework structure for displaying lyrics information.

[0108] This template contains basic layout elements and style rules related to the display of lyrics. From the layout point of view, it may determine the display position of the lyrics on the screen or projected image, such as centered display, top or bottom scrolling display, etc. In terms of style, it may specify the basic style attributes of the lyrics, such as font, font size, color, etc. When there is decoded data related to music playback, the preset placeholders of the lyrics template can be updated based on this data. For example, the current lyrics paragraph to be displayed is determined according to the progress of music playback, the color of the lyrics is adjusted to reflect the current singing part, etc., thereby generating a target image that meets the requirements and includes lyrics display.

[0109] Lyric templates can be set from a variety of sources. On the one hand, they can be factory-set defaults for the projection device 1. These default lyrics templates are typically pre-set by the device manufacturer based on the usage habits and common needs of most users. They are versatile and can meet basic lyric display requirements, such as default font styles and layouts.

[0110] Alternatively, the lyric template can be configured via a client connected to the projection device 1. Many projection devices 1 are now able to connect to clients such as mobile phones and computers, allowing users to customize the lyric template based on their preferences on the client software. The client software may offer more personalized options, such as a variety of fonts, rich color combinations, unique layouts, and even special effects such as fading in and out of lyrics.

[0111] In addition, the user can select the lyric template directly through the buttons on the projection device 1. The projection device 1 is provided with a number of function buttons, which the user can use to switch between several preset lyric templates within the device. This method is simple and direct to operate without the need for other devices, making it convenient for users who have high requirements for real-time operation to quickly adjust the display effect of the lyrics to suit different playback scenarios.

[0112] This embodiment decodes the target instruction according to the decoding method corresponding to the application type to obtain decoded data, ensuring accurate interpretation of the data. For the first application of the navigation map type, the navigation template is updated based on the decoded data to generate the target image, which helps to accurately and timely display navigation-related information in the projection and improve the visualization effect of the navigation information. For the first application of the music type, the lyrics template is updated based on the decoded data to obtain the target image, which enables the lyrics to be presented in an appropriate form in the projection, enhancing the accuracy and aesthetics of the lyrics display during music playback, and overall improving the adaptability of the projection device 1 to different types of applications and the accuracy of image generation.

[0113] In one embodiment, the step of controlling the projection device 1 to project an image onto the HUD reflective film 2 according to the target image in the projection processing unit further includes:

[0114] S12511: Acquire a first display brightness, where the first display brightness is the display brightness sent by the first application;

[0115] S12512: Control the projection device 1 to project an image onto the HUD reflective film 2 according to the target image and the first display brightness.

[0116] Specifically, the first display brightness may be parsed from the target instruction, or may be a brightness setting instruction sent separately by the first application, and the first display brightness may be parsed from the brightness setting instruction.

[0117] The first display brightness refers to a parameter value sent by the first application to indicate the brightness of the image when it is displayed. This parameter value reflects the brightness level expected by the application for the image projected onto the HUD reflective film 2.

[0118] First, the projection processing unit analyzes the target image to identify each element within the image and its corresponding display requirements, such as color distribution and contrast requirements. Simultaneously, it quantizes the received first display brightness information and converts it into actionable brightness parameter values. The projection processing unit then adjusts the light source output of the projection device 1 based on the target image analysis results and the brightness parameter values. If the target image contains large dark areas and the first display brightness is low, the light source output of the projection device 1 will be appropriately increased. However, this is done to avoid excessive brightness on the HUD reflective film 2, which could lead to image distortion. Algorithms are used to precisely control light source parameters such as intensity and color. Regarding color, if the target image requires a highly saturated color display and the first display brightness is high, the color brightness components are adjusted to meet the overall brightness requirements while preserving color distortion. Next, the projection processing unit controls the optical elements, such as the lens assembly, of the optical assembly 14 within the projection device 1 based on these adjusted parameters, focusing and refracting the light to ensure that the light is accurately projected onto the HUD reflective film 2, thereby achieving image projection that meets the target image and the first display brightness requirements.

[0119] In this embodiment, by obtaining the first display brightness, the projection processing unit can combine the target image with the display brightness information, thereby more accurately controlling the projection device 1 to project an image onto the HUD reflective film 2. This combination allows the projected image to be optimized and adjusted not only based on the content and requirements of the target image itself, but also based on the display brightness set by the first application.

[0120] In one embodiment, the step of controlling the projection device 1 to project an image onto the HUD reflective film 2 according to the target image in the projection processing unit further includes:

[0121] S12521: Acquire a second display brightness, wherein the second display brightness is data automatically determined according to the ambient brightness of the environment in which the projection device 1 is located;

[0122] S12522: Control the projection device 1 to project an image onto the HUD reflective film 2 according to the target image and the second display brightness.

[0123] The second display brightness is automatically determined based on the ambient brightness of the environment in which the projection device 1 is located. It is specifically used to control the brightness parameter when the projection device 1 projects an image onto the HUD reflective film 2. This brightness value is determined by taking the ambient brightness into account. Its purpose is to ensure that the image projected onto the HUD reflective film 2 achieves a good display effect under different ambient lighting conditions. For example, in bright environments, a higher second display brightness may be required to ensure a clear image, while in darker environments, a relatively lower second display brightness is required to avoid problems such as glare and overbrightness.

[0124] A specific ambient light sensor is used to obtain ambient brightness information about the environment in which projection device 1 is located. This ambient light sensor can detect the intensity of light in the environment and transmit the detected light intensity data to the projection processing unit. The ambient light sensor can be installed in projection device 1 or independently of projection device 1.

[0125] The ambient light sensor can be installed within the projection device 1 or independently of it. When installed within the projection device 1, it senses external light through a light-transmitting area reserved on the device's housing. The sensor's photosensitive element (such as a photodiode) generates an electrical signal based on the received light. The magnitude of this signal is proportional to the intensity of the ambient light. This signal is then converted into a digital signal by the circuitry within the projection device 1 and transmitted to the projection processing unit.

[0126] If the ambient light sensor is provided independently of the projection device 1, it can communicate with the projection device 1 via a wired (e.g., USB, SPI, or other interface) or wireless (e.g., Bluetooth, Wi-Fi, etc.) method. After the ambient light sensor detects the light intensity, its signal processing unit converts the light intensity into a corresponding signal format (which may be converted into a specific wireless communication protocol format if wireless communication is used, or into a corresponding digital or analog signal if wired communication is used). This signal containing the ambient light intensity data is then transmitted to the projection processing unit in the projection device 1, thereby transmitting the detection data of the ambient light sensor to the projection device 1 for subsequent operations such as determining the second display brightness.

[0127] The projection processing unit processes the acquired ambient light intensity data according to a preset algorithm, automatically determining a second display brightness. For example, when the ambient light intensity data is above a certain threshold, the projection processing unit calculates a higher second display brightness based on a specific proportional relationship; when the ambient light intensity data is below the threshold, a lower second display brightness is calculated. The projection processing unit then uses the target image and the determined second display brightness as parameters and sends instructions to the projection device 1 via the control circuit. Based on these instructions, the projection device 1 adjusts relevant settings such as the light source intensity and image display color parameters, thereby projecting an image onto the HUD reflective film 2 that meets the target image requirements and adapts to the ambient brightness.

[0128] First, this embodiment enables the image projected onto the HUD reflective film 2 to better adapt to environmental changes by obtaining a second display brightness that is automatically determined based on the ambient brightness of the environment in which the projection device 1 is located. When the ambient brightness is high, such as outdoors in strong sunlight, the automatically determined second display brightness may be higher, which ensures that the projected image remains clearly visible and is not obscured by excessive ambient light. Conversely, in conditions of low ambient brightness, such as at night or in a dimly lit room, the second display brightness will be reduced accordingly, which can both ensure the visibility of the image and avoid discomfort to the user's eyes caused by excessive brightness. Secondly, by combining the target image with the second display brightness to control the projected image, the display effect of the image can be optimized according to the ambient brightness while ensuring the complete display of the original content of the image, thereby improving the image's contrast, color saturation, and other aspects, thereby enhancing the user's overall experience of viewing the image projected on the HUD reflective film 2.

[0129] In one embodiment, the step of controlling the projection device 1 to project an image onto the HUD reflective film 2 according to the target image in the projection processing unit further includes:

[0130] S12531: Acquire the target image at the same display time as an image package;

[0131] The target images of the same application are stored in the same queue, and each target image carries a timestamp, which may be the time when the target instruction was generated.

[0132] To obtain the target image at the same display moment, all relevant queues must be traversed first. For each queue (corresponding to a different application), the timestamp of each target image is checked starting from the head of the queue. A specific time threshold range is set. When the timestamp of the target image falls within this range, the target image is marked as the target image at the same display moment. Since the target images of the same application are already stored in order in the same queue, this timestamp matching operation can be performed efficiently. Once the traversal of all queues is completed, the marked target images are collected, and these images together constitute an image package.

[0133] S12532: If the application type corresponding to the image package does not include both music and navigation map, controlling the projection device 1 to project an image onto the HUD reflective film 2 according to the image package;

[0134] If the application type corresponding to the image package does not include music and navigation maps at the same time, it means that lyrics and navigation do not need to be displayed at the same time. Therefore, according to the image package (there is only one target image at this time), the projection device 1 is controlled to project the image onto the HUD reflective film 2.

[0135] S12533: If the application type corresponding to the image package includes music and navigation map, the moving speed of the projection device 1 is obtained, and a splicing template is obtained from a template library according to the moving speed. According to the splicing template, the image package is spliced ​​to obtain a spliced ​​image, and according to the spliced ​​image, the projection device 1 is controlled to project the image onto the HUD reflective film 2.

[0136] Specifically, if the application type corresponding to the image package includes music and navigation map, this means that lyrics and navigation need to be displayed at the same time. The image package contains multiple target images. Therefore, the moving speed of the projection device 1 is obtained by communicating with the speed sensor built into the projection device 1 (such as a GPS module or other speed measurement component), or the vehicle speed is extracted from the decoded data corresponding to the application type of the navigation map as the moving speed of the projection device 1.

[0137] After obtaining the movement speed of the projection device 1, this speed is used as a key parameter in interaction with a template library. The template library contains pre-stored stitching templates corresponding to different speed ranges. A matching stitching template is then found based on the movement speed. Next, for each target image in the image package, image stitching operations are performed according to the rules defined by the acquired stitching template. For example, the image layout, scaling, and overlap are all determined based on the stitching template, resulting in a stitched image. Finally, based on the stitched image, the projection device 1 is controlled to project the image onto the HUD reflective film 2.

[0138] For example, when driving at high speed, navigation and vehicle speed are displayed first, and the lyrics are reduced to the edge; when parking, the lyrics are displayed in full screen.

[0139] First, this embodiment integrates and manages images at specific moments by acquiring target images at the same display moment as an image package. When the application types corresponding to the image package do not simultaneously include music and navigation maps, the projection device 1 is directly controlled to project the image onto the HUD reflective film 2 based on the image package, ensuring the normal projection display of conventional images and improving projection efficiency and accuracy. When the application types corresponding to the image package include both music and navigation maps, the image package is spliced ​​to obtain a spliced ​​image by acquiring the movement speed of the projection device 1 and then obtaining a splicing template from a template library. Projection is then controlled based on the spliced ​​image. This operation method can specifically address the special case where both music and navigation maps exist simultaneously. Acquiring an appropriate splicing template based on movement speed helps adapt to different driving or mobile states, allowing the image ultimately projected onto the HUD reflective film 2 to better integrate music and navigation map related information, providing users with a more comprehensive visual presentation that better meets the needs of the user scenario.

[0140] In one embodiment, the step of controlling the projection device 1 to project an image onto the HUD reflective film 2 according to the target image in the projection processing unit further includes:

[0141] S12541: Obtain driver fatigue status;

[0142] Driver fatigue refers to a state of fatigue. From a driving behavior perspective, a fatigued driver may exhibit abnormal vehicle control. For example, the vehicle's speed may be unstable, sometimes accelerating and sometimes slowing down; the vehicle's trajectory within the lane may be unsteady, with left and right deviations or even crossing the lane line; the braking and accelerator operation may become imprecise, with an increase in the frequency of sudden braking and acceleration; and there may be a slight loss of control over the steering wheel, resulting in unsmooth steering. This information can be combined to determine whether the driver is fatigued.

[0143] There are many ways to obtain the driver's fatigue status. A common way is to use a camera to monitor the driver's facial features, such as the frequency of eye opening and closing, the duration of blinking, the frequency of yawning, etc. When the eyes are closed for a long time or the blinking duration increases abnormally, or yawning occurs frequently, it may mean that the driver is in a state of fatigue. It is also possible to monitor the driver's head posture. If the head shakes frequently or droops, it may also indicate fatigue. In addition, it is also possible to judge from the vehicle's driving behavior data, such as whether the vehicle's driving trajectory has abnormal deviations, whether the frequency of sudden acceleration and sudden braking has increased, etc. These unstable driving behaviors may indicate that the driver is in a state of fatigue driving.

[0144] In addition to the aforementioned method of judging the driver's fatigue state by monitoring facial features and driving behavior through a camera, if the projection device 1 is used for calculation, the projection device 1 can have a built-in infrared sensing module, etc. When the driver sits in the driver's seat, the infrared sensor can detect the driver's body contour and movement amplitude. If the body movements become slow, irregular, or remain still for a long time (for example, leaning on the seat for a long time without normal body adjustment movements), fatigue may be indicated. At the same time, the projection device 1 can project specific light onto the driver's face and analyze the state of the eyes through changes in reflected light, such as pupil contraction, changes in the reflection of the white part of the eyes, etc. to determine whether there is fatigue.

[0145] If data is obtained from third-party applications, the third-party applications may integrate data from smart wearable devices. For example, smart bracelets or smart watches can monitor the driver's heart rate, blood pressure and other physiological data. During normal driving, heart rate and blood pressure are within a relatively stable range. When fatigue occurs, the heart rate may decrease and become unstable, and blood pressure may also fluctuate. The third-party application obtains this data and analyzes and judges it. In addition, the third-party application may also connect to the vehicle's onboard computer to obtain more comprehensive vehicle driving data, such as the vehicle's continuous driving time and engine operating status, and combine it with its own algorithms to infer the driver's fatigue state.

[0146] S12542: If the driver's fatigue state is within a preset state range, when projecting an image onto the HUD reflective film 2 according to each target instruction sent by the target device, the image projected by the projection device 1 does not include a lyrics image.

[0147] First, a preset range of driver fatigue status must be determined. This range can be established through extensive experimentation and data collection. For example, a combination of fatigue characteristic indicators, such as eye closure time exceeding a certain percentage, yawning frequency exceeding a certain threshold, and head shaking amplitude exceeding a certain angle range, can be used to define this preset range. When projection device 1 is connected to a system that monitors the driver's status, the system continuously acquires driver status information, such as facial expressions and head posture captured by in-vehicle cameras, or physiological data obtained from other relevant devices. Once the driver's fatigue status is determined to be within the preset range, projection device 1, upon receiving various target commands sent by the target device and preparing to project an image onto the HUD reflective film 2, filters the image content to be projected. If the image to be projected includes lyrics, the lyrics are removed from the projected content, and only other necessary image content, such as navigation arrows, vehicle speed, and road condition indicators, is projected. This avoids the potential distraction caused by the lyrics, thereby reducing interference to the fatigued driver and ensuring driving safety.

[0148] Optionally, disconnecting the communication connection between the projection device 1 and the first application of the target device whose application type is music can prevent the music application from sending a target instruction, thereby preventing the projected image from including a lyric image.

[0149] Optionally, according to the target image, the projection device 1 is controlled to project an image onto the HUD reflective film 2 , and only the target image corresponding to the first application whose application type is a navigation map is obtained for projection.

[0150] This embodiment detects the driver's fatigue status. When the driver's fatigue status is within a preset range, the projection device 1 excludes the lyric image from the projected image. This measure is primarily based on the consideration that when a driver is fatigued, their attention and reaction abilities decrease. Lyric images can distract the driver. Removing them can reduce unnecessary visual interference, allowing the driver to focus more on important driving-related information, such as navigation maps, thereby improving driving safety and reducing the risk of traffic accidents caused by distraction.

[0151] In one embodiment, the projection device 1 includes: a device controller 12, a display 13, an optical component 14, a communication component 15 and a power supply component 16, and the device controller 12 is integrated with the projection processing unit;

[0152] The device controller 12 is used to control the operation of the display 13, the optical component 14, the communication component 15 and the power supply component 16;

[0153] The power supply component 16 is used to supply power to the device controller 12 , the display 13 , the optical component 14 , and the communication component 15 .

[0154] The device controller 12 is the core control unit of the projection device 1, integrating the projection processing unit. It is primarily implemented through a built-in microprocessor and associated circuitry. The microprocessor pre-stores a series of control instructions and algorithms that define how to coordinate the operations of the other components. When the projection device 1 receives external signals or instructions, such as target instructions from a target device, the microprocessor in the device controller 12 interprets these instructions. Based on the interpretation results, it sends a display signal to the display 13 via a dedicated control circuit, informing the display 13 of the desired content. For the optical component 14, the device controller 12 adjusts its optical parameters, such as focal length and aperture size, to ensure that the image is accurately projected onto the HUD reflective film 2. When interacting with the communication component 15, the device controller 12 monitors communication status, controls data reception and transmission, and ensures smooth information transmission. It also manages the power distribution of the power supply component 16, allocating energy appropriately based on the operating status of each component to achieve overall efficient operation.

[0155] The display 13 is a component responsible for generating images. It displays images through display technologies such as liquid crystal display technology (LCD) or organic light emitting diodes (OLED). In the liquid crystal display 13, the liquid crystal molecules change their arrangement direction under the action of the electric field, thereby controlling whether light is transmitted or not, and forming various colors and patterns through different combinations of the three primary colors of red, green, and blue. When the device controller 12 sends a display signal, the driving circuit inside the display 13 will accurately control the liquid crystal molecules according to the signal and convert the received image data into a corresponding optical signal. In the case of an OLED display 13, its own organic light-emitting material directly emits light under the drive of electric current. By individually controlling each pixel, higher contrast and more vivid colors can be achieved.

[0156] The optical assembly 14 mainly includes optical elements such as lenses and reflectors, and its implementation method is to carefully design and combine these elements based on optical principles. The lens is used to focus and adjust the propagation direction of light. Through precise curvature design, the light emitted by the display 13 can be effectively converged so that it can be projected onto the HUD reflective film 2 at a suitable angle. The reflector is used to change the propagation path of light and realize the steering and optimized layout of light in a limited space. The various components of the optical assembly 14 need to maintain a precise relative position relationship, which is guaranteed by precise mechanical structure and installation process. In addition, the optical assembly 14 may also be equipped with some adjustment devices, such as a movable lens bracket or a rotatable reflector, so that the device controller 12 can dynamically adjust the optical assembly 14 according to different projection distances, angle requirements, image size and other requirements, thereby ensuring that the image projected onto the HUD reflective film 2 is clear and accurate.

[0157] The implementation of communication component 15 depends on the specific communication protocol and hardware circuitry. It can use wireless communication methods, such as Bluetooth or Wi-Fi, or wired communication methods, such as a USB interface. If Bluetooth communication is used, communication component 15 contains an internal Bluetooth chip that performs signal modulation and demodulation according to Bluetooth protocol specifications. When transmitting data, the data prepared by device controller 12 is encoded and modulated according to the Bluetooth protocol and then transmitted via the Bluetooth antenna. When receiving data, the Bluetooth signal from the target device is received via the Bluetooth antenna, demodulated and decoded, and then transmitted to device controller 12. For Wi-Fi communication, the Wi-Fi module in communication component 15 complies with relevant Wi-Fi standards and is responsible for establishing and maintaining a connection with the Wi-Fi network, enabling high-speed data transmission. Wired communication interfaces, on the other hand, transmit data through corresponding physical interface circuitry, such as the electrical circuitry of a USB interface or the differential signal circuitry of an HDMI interface. Communication component 15 ensures correct data transmission, including functions such as data integrity verification and error detection and correction, to ensure stable communication between projection device 1 and the target device.

[0158] The implementation of the power supply assembly 16 must first consider how to convert an external power source (such as a vehicle's power system or an external AC power source) into the appropriate voltage and current required by the various components within the projection device 1. It typically includes circuit components such as a transformer, a rectifier, and a voltage regulator. The transformer converts the input high voltage into a lower voltage, the rectifier converts AC power into DC power, and the voltage regulator ensures that the output voltage remains stable near the voltage required by each component to prevent voltage fluctuations from damaging the device. The power supply assembly 16 also needs to provide overload and short-circuit protection. This is achieved by incorporating fuses, current-limiting resistors, or specialized protection chips into the circuit. When a current overload or short circuit is detected, the protection device promptly disconnects the circuit to prevent damage to the device due to overcurrent. Furthermore, the power supply assembly 16 must distribute power appropriately to the display 13, optical component 14, communication component 15, and other components according to instructions from the device controller 12. It also dynamically adjusts the power supply based on the operating status of each component, for example, reducing the power supply when the device is in standby mode to save energy.

[0159] In one embodiment, the power supply assembly 16 is electrically connected to an onboard system of the target vehicle, and the onboard system charges the power supply assembly 16 .

[0160] The vehicle's onboard system has a dedicated power output interface whose output voltage and current meet certain standards, such as the common 12V or 24V DC voltage. The power supply assembly 16 is equipped with a corresponding charging interface, which is connected to the power output interface of the onboard system via appropriate wires. When the two are connected, the onboard system's power management module will identify the connected external device (i.e., the power supply assembly 16 of the projection device 1) and then begin supplying power according to a pre-set charging strategy. The charging circuit may be equipped with protective devices such as fuses to prevent abnormal conditions such as overcurrent from damaging the device. At the same time, the power supply assembly 16 has an internal charging circuit. This circuit first detects and performs preliminary filtering on the input voltage to remove possible voltage fluctuations and noise, and then converts the voltage into a voltage value suitable for charging the battery or energy storage element within the power supply assembly 16. By controlling parameters such as the charging current and charging time, it is possible to safely and stably obtain power from the onboard system for charging.

[0161] Those skilled in the art will clearly understand that for the sake of convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0162] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A HUD-based display system, characterized in that: The system includes: a HUD reflective film and a projection device, wherein the HUD reflective film is used to be applied to the window glass of a target vehicle; The projection device is in communication with the target device and is used to project an image onto the HUD reflective film according to various target instructions sent by the target device; Among them, when the application type corresponding to the target instruction is a navigation map, the HUD reflective film is used to display the navigation image in a mirrored manner based on the image projected by the projection device; when the application type corresponding to the target instruction is music, the HUD reflective film is used to display the lyrics image in a mirrored manner based on the image projected by the projection device.

2. The HUD-based display system according to claim 1, characterized in that: The projection device is integrated with a projection processing unit, and the projection processing unit is configured to implement the following steps: Establishing a communication connection between the projection device and the target device as a first connection; Based on the first connection, establishing a communication connection between the projection device and a first application running in the foreground of the target device as a target connection, wherein the application type of the first application is music or navigation map, and the running mode of the first application in the target connection is foreground running or background running; Based on the target connection, obtaining the target instruction sent by the first application; generating a target image according to the target instruction; According to the target image, the projection device is controlled to project the image onto the HUD reflective film.

3. The HUD-based display system according to claim 2, characterized in that: The steps of establishing, in the projection processing unit, a communication connection between the projection device and a first application running in the foreground of the target device based on the first connection as a target connection, and acquiring, based on the target connection, the target instruction sent by the first application, include: Based on the first connection, a communication connection is established between the projection device and a first application running in the foreground of the target device and having an application type of music, as the target connection, and based on the target connection, the target instruction sent by the first application is obtained; Based on the first connection, a communication connection is established between the projection device and the first application running in the foreground of the target device and whose application type is a navigation map. As a second connection, an MTU negotiation request is initiated to the first application based on the second connection using the API of the Bluetooth protocol stack to determine the MTU value, and the target connection is obtained. Based on the target connection, the target instruction sent by the first application is obtained according to the MTU value.

4. The HUD-based display system according to claim 2, characterized in that: The step of generating a target image according to the target instruction in the projection processing unit includes: Decoding the target instruction according to a decoding method corresponding to an application type corresponding to the target instruction to obtain decoded data; If the application type of the first application is a navigation map, updating a navigation template according to the decoded data to obtain the target image; If the application type of the first application is music, the lyrics template is updated according to the decoded data to obtain the target image.

5. The HUD-based display system according to claim 2, characterized in that: The step of controlling the projection device to project an image onto the HUD reflective film according to the target image in the projection processing unit further includes: Obtaining a first display brightness, wherein the first display brightness is the display brightness sent by the first application; According to the target image and the first display brightness, the projection device is controlled to project an image onto the HUD reflective film.

6. The HUD-based display system according to claim 2, characterized in that: The step of controlling the projection device to project an image onto the HUD reflective film according to the target image in the projection processing unit further includes: Acquire a second display brightness, wherein the second display brightness is data automatically determined according to the ambient brightness of an environment in which the projection device is located; According to the target image and the second display brightness, the projection device is controlled to project an image onto the HUD reflective film.

7. The HUD-based display system according to claim 2, wherein: The step of controlling the projection device to project an image onto the HUD reflective film according to the target image in the projection processing unit further includes: Acquire the target image at the same display moment as an image package; If the application type corresponding to the image package does not include both music and navigation maps, controlling the projection device to project an image onto the HUD reflective film according to the image package; If the application type corresponding to the image package includes music and navigation maps, the moving speed of the projection device is obtained, and a stitching template is obtained from a template library based on the moving speed. The image package is stitched according to the stitching template to obtain a stitched image. Based on the stitched image, the projection device is controlled to project the image onto the HUD reflective film.

8. The HUD-based display system according to claim 2, characterized in that: The step of controlling the projection device to project an image onto the HUD reflective film according to the target image in the projection processing unit further includes: Get the driver's fatigue status; If the driver's fatigue state is within a preset state range, when projecting an image onto the HUD reflective film according to each target instruction sent by the target device, the image projected by the projection device does not include a lyrics image.

9. The HUD-based display system according to claim 2, wherein: The projection device includes: a device controller, a display, an optical component, a communication component and a power supply component, and the device controller is integrated with the projection processing unit; The device controller is used to control the operation of the display, the optical component, the communication component and the power supply component; The power supply component is used to supply power to the device controller, the display, the optical component, and the communication component.

10. The HUD-based display system according to claim 9, characterized in that: The power supply assembly is electrically connected to the onboard system of the target vehicle, and the onboard system charges the power supply assembly.

Images