Wireless screen projection system with display picture size vector scaling

Abstract

The invention discloses a wireless screen projection system with a display picture size vector scaling function, belongs to the field of wireless screen projection displays, and aims to solve the problems of poor compatibility, inconvenience in display adjustment and conflict between screen projection and operation of existing equipment. The system comprises a screen projection host, a wireless communication module, a gravity sensing module, a touch display module, a signal processing module and a central control unit, and all the modules are electrically connected with the central control unit. The wireless communication module supports multi-protocol and Bluetooth auxiliary pairing, and adapts to various external devices; the gravity sensing module collects attitude data for the central control unit to adaptively adjust the display direction; the touch display module comprises a display zooming adjusting key and supports picture zooming; and the central control unit coordination module realizes display adjustment, lossless zooming and screen projection mode switching. The system supports a double-screen projection mode, and synchronous screen projection of equipment or independent operation of the screen projection and the equipment can be realized. Through module cooperation, multi-device compatibility and intelligent screen projection are realized, and the method is suitable for multiple scenes.

Description

Technical Field

[0001] This invention relates to the field of wireless screen projection, specifically a wireless screen projection system with vector scaling of display screen size. Background Technology

[0002] With the widespread adoption of smart devices and the diversification of office and entertainment scenarios, wireless screen projection technology, due to its advantages of being free from cables and easy to operate, has been widely used in scenarios such as conference presentations, home movie viewing, and educational demonstrations. However, most existing wireless screen projection devices suffer from the following technical shortcomings: 1) Poor device compatibility: Most screen mirroring devices only support connection to a single system or a few types of devices, and cannot be adapted to multiple system devices such as Apple iOS, Android, Windows, and macOS at the same time. This causes users to need to change screen mirroring tools when using different devices, which is inconvenient. 2) Insufficient display adjustment flexibility: The display direction of existing screen projection devices is mostly fixed and cannot be adaptively adjusted according to the device's placement or usage needs. In addition, the screen scaling function mostly depends on the system settings of the screen projection device, which is cumbersome to operate and prone to problems such as image distortion and reduced clarity. 3) Conflict between screen mirroring and device operation: In traditional screen mirroring mode, the screen mirroring screen and the operation of the screen mirroring device are synchronized in real time. When the user needs to perform other operations on the device during the screen mirroring process, the screen mirroring screen will switch accordingly, making it impossible to continuously play the target content and limiting the multi-tasking use scenarios of the device.

[0003] Therefore, those skilled in the art have provided a wireless projection system with vector scaling of the display screen size to solve the problems mentioned in the background art. Summary of the Invention

[0004] The purpose of this invention is to provide a wireless screen projection system with vector scaling of display screen size to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A wireless projection system with vector scaling of display screen size includes a projection host, a wireless communication module, a gravity sensing module, a touch display module, a signal processing module, and a central control unit; the wireless communication module, gravity sensing module, touch display module, and signal processing module are all electrically connected to the central control unit; The wireless communication module supports the IEEE 802.11b / g / n / ac protocol to establish a wireless connection between the projection host and external electronic devices (such as smartphones, tablets, laptops, smart wearable devices, IoT display terminals, etc.) to transmit projection signals. This module can also integrate a Bluetooth unit for assisted quick pairing, automatically switching to Wi-Fi projection connection after successful pairing. In addition to standard Wi-Fi, it also supports the "Wi-FiDirect" protocol for point-to-point direct connection in environments without a network. The gravity sensing module uses a three-axis accelerometer to collect the placement posture data of the projection host in real time and transmit it to the central control unit. The touch display module includes a display panel for displaying the projected image; the projection host also includes a display scaling adjustment button electrically connected to the central control unit. The touch display module is only used for displaying the projected image. The image scaling control is achieved through the display scaling adjustment button on the projection host housing. The display scaling adjustment button includes a zoom-in button and a zoom-out button. Pressing the button directly sends a scaling command to the central control unit. The signal processing module is also configured to temporarily store the projection signal with black borders transmitted by the external electronic device in the chip's DDR memory for the central control unit to analyze the black border area; and then perform black border cropping, image magnification and image quality optimization according to the instructions of the central control unit to ensure that the output image has no black borders and maintains the aspect ratio. The central control unit is configured to: adaptively adjust the display direction of the projected image based on the attitude data collected by the gravity sensing module; and, in response to the operation of the display scaling adjustment button, control the projected image to be proportionally enlarged and the black borders cropped (the cropping range can be set as needed) based on the image data in the chip's DDR memory, so as to achieve lossless display while maintaining the aspect ratio.

[0006] As a further technical solution of the present invention, the screen projection host also includes a QR code generation module and a storage module; the QR code generation module is electrically connected to the central control unit and is used to generate a pairing QR code containing connection information in a specific mode and display it on the display panel of the touch display module; the storage module is electrically connected to the central control unit and is used to cache temporary data and commonly used screen projection settings during the screen projection process.

[0007] As a further technical solution of the present invention, the screen projection mode includes a first screen projection mode and a second screen projection mode; The first screen projection mode is as follows: after an external electronic device connects to the screen projection host wirelessly, the device screen image is projected onto the display panel in real time, and the device operation is consistent with the projected screen image; The second screen projection mode is as follows: After the external electronic device scans the pairing QR code, it establishes a connection with the screen projection host. The external electronic device selects the target media content for projection, and the screen projection host continuously plays the target media content. The external electronic device can independently switch the operation interface, and the projection signal and the operation of the external electronic device do not interfere with each other.

[0008] As a further technical solution of the present invention, after receiving the scaling command, the central control unit controls the projected screen to be scaled proportionally according to a preset gradient, and maintains the image clarity without significant loss during the scaling process.

[0009] As a further technical solution of the present invention, the sampling frequency of the gravity sensing module can be set to 10Hz-50Hz. The central control unit determines the placement state of the projection host based on the posture data. The placement state includes horizontal screen state and vertical screen state. The central control unit can complete the adaptive adjustment of the projection display direction in a short time (e.g., within 50ms) without any screen lag during the adjustment process.

[0010] As a further technical solution of the present invention, the central control unit identifies the black border area of ​​the projected image in the DDR memory of the chip through a pixel brightness threshold algorithm. The cropping width of the black border area can be adjusted in real time according to the display panel resolution and the target display ratio. The display scaling adjustment button adopts a self-resetting tactile switch, which is electrically connected to the central control unit through a GPIO interface, and the button trigger response time is ≤5ms. A screen projection method for a wireless screen projection system with vector scaling of display screen size, characterized by comprising the following steps: S1: Start the screen projection host, the central control unit controls the initialization of each module, the wireless communication module enables the WIFI signal transmission function (Wi-FiDirect mode can be enabled at the same time), and the screen projection host enters the screen projection waiting state. S2: Users can complete the initial connection by operating external electronic devices (such as Apple iPhone 14, Windows 11 laptops, etc.) in the following ways: Method 1: Turn on Bluetooth, search for and pair with the screen mirroring host's Bluetooth signal, and automatically connect to WIFI after successful pairing; Method 2: Directly search for and connect to the screen mirroring host's Wi-Fi signal in the Wi-Fi settings; Method 3: When there is no network, enable the Wi-FiDirect function to establish a direct point-to-point connection with the screen projection host; S3: The central control unit starts the first screen projection mode by default. The screen image of the external electronic device is transmitted to the signal processing module via the wireless communication module. After the signal processing module decodes and reduces noise, it is transmitted to the display panel of the touch display module to achieve real-time synchronous screen projection. S4: During the screen projection process, when the user switches the projection host from landscape to portrait mode, the gravity sensor module collects the attitude change data and transmits it to the central control unit. The central control unit controls the screen projection image on the display panel to switch from landscape to portrait mode within 30ms, and the switching process is smooth. S5: When the user presses the zoom button on the display, the central control unit receives the instruction and calls the corresponding algorithm to control the screen projection to maintain the aspect ratio and perform lossless zooming according to the preset gradient (e.g., after pressing 3 times in a row, the screen is zoomed to 130% of the original screen. You can press continuously to zoom in proportionally with the initial screen projection screen after removing the black borders, using the same aspect ratio of 16:9 and 9:16). There is no significant loss of image clarity during the zooming process. S6: When the user needs to operate the external electronic device independently, the user can switch to the second projection mode through the projection control interface of the external electronic device. After receiving the switching command, the central control unit controls the QR code generation module to generate a pairing QR code, which is displayed in the upper right corner of the display panel. S7: Users scan the pairing QR code on the display panel using an external electronic device. The external electronic device establishes a connection with the screen casting host. Users then select the target video in the video app on the external electronic device and click "Screen Cast". S8: The wireless communication module of the screen casting host receives the screen casting signal of the target video. After being processed by the signal processing module, the target video is continuously played on the display panel. External electronic devices can freely switch to other interfaces such as chat and office, and the screen casting signal is not affected. S9: After the video playback ends, the user clicks "Disconnect" in the screen mirroring control interface of the external electronic device. The screen mirroring host disconnects from the external electronic device, and the central control unit controls each module to enter a low-power standby state. If the user does not manually disconnect, the screen mirroring host will automatically enter standby state after 3 minutes of no signal input.

[0011] Compared with the prior art, the beneficial effects of the present invention are: 1. Multi-device compatibility and wide adaptability: This invention optimizes the protocol support of the wireless communication module to achieve compatible connection with multiple systems and types of external electronic devices without the need to change the screen projection tool, meeting the device usage needs of different users and solving the problem of poor compatibility of existing devices; 2. Intelligent and flexible display adjustment: The gravity sensor module works in conjunction with the central control unit to achieve adaptive adjustment of the projection display direction without manual setting; the integrated buttons for controlling proportional scaling support lossless scaling that maintains the aspect ratio of the image, making operation convenient and avoiding the problems of image distortion and reduced clarity caused by traditional scaling, thus improving the user experience. 3. Dual-mode screen casting with no operational conflicts: The system creatively designs a first screen casting mode (real-time synchronization) and a second screen casting mode (separate playback). The second screen casting mode separates the screen casting signal from the operation of external electronic devices through QR code scanning and pairing. Users can freely use external electronic devices while casting, which solves the problem of conflict between operation and screen casting in traditional screen casting and expands the application scenarios of screen casting. 4. System Collaboration and Enhanced Experience: Under the scheduling of the central control unit, all functional modules work collaboratively. The gravity sensor module provides environmental awareness, the touch display module provides intuitive interaction, and the wireless communication module and signal processing module ensure signal stability and image quality. Together, they achieve an effective balance between physical posture adaptation, lossless adjustment of screen content, and separation of screen projection tasks and device operation, providing a smooth, flexible, and efficient system-level screen projection experience that cannot be achieved by single function improvements. 5. Stable connection and excellent picture quality: Bluetooth-assisted pairing improves connection efficiency, and the decoding and noise reduction of the signal processing module ensures a stable and clear screen projection. The overall structure is reasonably designed with a low failure rate, making it suitable for various scenarios such as office, home, and education. Attached Figure Description

[0012] Figure 1 This is a hardware structure block diagram of the intelligent wireless screen projection system in an embodiment of the present invention; Figure 2 This is a flowchart of the screen projection method in an embodiment of the present invention. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] Please see Figures 1-2 In this embodiment of the invention, a wireless projection system with vector scaling of display screen size includes a projection host. The projection host integrates a central control unit, a wireless communication module, a gravity sensing module, a touch display module, a signal processing module, a QR code generation module, and a storage module. Each module is electrically connected to the central control unit via a line. The projection host casing is equipped with a display scaling adjustment button (6mm in diameter, 0.3mm travel), which can perform "zoom in", "zoom out", and / or "restore" functions for the display screen. The button pin is connected to the GPIO2 / GPIO3 pin of the central control unit via a 4-pin wire. The hardware driver is integrated into the initialization process of the central control unit and automatically recognizes the button status after startup.

[0015] The wireless communication module uses the TL8731BUUA1 wireless communication 1.WIFI module; the Bluetooth auxiliary connection unit adopts the BLE5.0 protocol, which supports fast pairing with external electronic devices; at the same time, the module also supports the Wi-FiDirect protocol, which can realize point-to-point direct connection in the absence of network environment.

[0016] The gravity sensor module is model SC7A20HTR, and the sampling frequency can be set to 30Hz (within the range of 10Hz-50Hz). It can accurately capture the placement posture of the projection host (horizontal or vertical screen) and transmit the data to the central control unit in real time. The DDR memory model is NT5CB64M16FP.

[0017] The touch display module uses a 10.1-inch IPS display panel with a resolution of 1920×1200. The display panel integrates buttons for controlling proportional scaling (including zoom in and zoom out buttons). The buttons use a capacitive touch design with a response time of ≤10ms.

[0018] The signal processing module uses the HI3516CV500 video processing chip, which supports decoding of various video formats and has noise reduction and image quality enhancement functions. When the image is scaled, it can perform sharpening processing simultaneously to ensure that there is no significant loss of image clarity.

[0019] The QR code generation module uses an STM32F103 microcontroller to communicate with the central control unit. It generates a pairing QR code containing connection information according to the instructions of the central control unit and transmits it to the display panel for display.

[0020] The storage module uses a 16GB NAND Flash chip to cache temporary screen projection data and commonly used user settings.

[0021] The central control unit uses an ARM Cortex-A9 processor with a main frequency of 1.2GHz, which has multi-tasking capabilities and can coordinate the efficient operation of various modules. It can adjust the display orientation within 30ms (or within 50ms) based on the data from the gravity sensor module, control the screen to scale according to a preset gradient, and can call bilinear interpolation, bicubic interpolation, Lanczos interpolation algorithm, or deep learning-based super-resolution technology to achieve lossless scaling while maintaining the aspect ratio.

[0022] like Figure 2 As shown, the screen projection method in this embodiment is implemented based on the aforementioned wireless screen projection system with vector scaling of display screen size. The specific steps are as follows: S1: Start the screen projection host, the central control unit controls the initialization of each module, the wireless communication module enables the WIFI signal transmission function (Wi-FiDirect mode can be enabled at the same time), and the screen projection host enters the screen projection waiting state. S2: Users can complete the initial connection by operating external electronic devices (such as Apple iPhone 14, Windows 11 laptops, etc.) in the following ways: Method 1: Turn on Bluetooth, search for and pair with the screen mirroring host's Bluetooth signal, and automatically connect to WIFI after successful pairing; Method 2: Directly search for and connect to the screen mirroring host's Wi-Fi signal in the Wi-Fi settings; Method 3: When there is no network, enable the Wi-FiDirect function to establish a direct point-to-point connection with the screen projection host; S3: The central control unit starts the first screen projection mode by default. The screen image of the external electronic device is transmitted to the signal processing module via the wireless communication module. After the signal processing module decodes and reduces noise, it is transmitted to the display panel of the touch display module to achieve real-time synchronous screen projection. S4: During the screen projection process, when the user switches the projection host from landscape to portrait mode, the gravity sensor module collects the attitude change data and transmits it to the central control unit. The central control unit controls the screen projection image on the display panel to switch from landscape to portrait mode within 30ms, and the switching process is smooth. S5: When the user presses the zoom button on the display, the central control unit receives the instruction and calls the corresponding algorithm to control the screen projection to maintain the aspect ratio and perform lossless zooming according to the preset gradient (ratio). For example, after pressing 3 times in a row, the screen will be zoomed to 130% of the original screen. You can press continuously to zoom in at the same ratio of 16:9 and 9:16 after the black borders are removed from the initial screen projection screen. There is no significant loss of image clarity during the zooming process. S6: When the user needs to operate the external electronic device independently, the user can switch to the second projection mode through the projection control interface of the external electronic device. After receiving the switching command, the central control unit controls the QR code generation module to generate a pairing QR code, which is displayed in the upper right corner of the display panel. S7: Users scan the pairing QR code on the display panel using an external electronic device. The external electronic device establishes a connection with the screen casting host. Users then select the target video in the video app on the external electronic device and click "Screen Cast". S8: The wireless communication module of the screen casting host receives the screen casting signal of the target video. After being processed by the signal processing module, the target video is continuously played on the display panel. External electronic devices can freely switch to other interfaces such as chat and office, and the screen casting signal is not affected. S9: After the video playback ends, the user clicks "Disconnect" in the screen mirroring control interface of the external electronic device. The screen mirroring host disconnects from the external electronic device, and the central control unit controls each module to enter a low-power standby state. If the user does not manually disconnect, the screen mirroring host will automatically enter standby state after 3 minutes of no signal input.

[0023] In step S5, the user presses the zoom-out button on the display zoom adjustment button. After receiving the instruction, the central control unit calls the corresponding algorithm to control the projected screen to be reduced in a lossless manner while maintaining the aspect ratio according to the preset gradient (ratio). There is no significant loss of image clarity during the zooming process. Furthermore, when an external mobile phone projects its screen in a 4:3 ratio (with black bars on the left and right sides), the signal processing module stores the image data in DDR (capacity ≥ 2GB, speed ≥ 1600Mbps). The central control unit detects that the width of the black bars is 120 pixels per side. Based on the target 16:9 ratio, it calculates that 240 pixels need to be cropped (120 pixels on each side). Then, it controls the signal processing module to extract the effective image in the middle, enlarge it to a resolution of 1920×1080, and output it to the display panel.

[0024] Example 1: Hardware Structure of Wireless Screen Projection System like Figure 1 As shown, the core hardware module configuration and functions of this embodiment are as follows: Central control unit: It adopts an ARM Cortex-A9 processor with a main frequency of 1.2GHz. It has multi-tasking capabilities and can coordinate the efficient operation of various modules such as wireless communication module and gravity sensor module. At the same time, it can execute core logic such as display orientation adjustment, screen scaling control and screen projection mode switching.

[0025] Wireless communication module: Employs the MT7628N Wi-Fi chip, supporting IEEE 802.11b / g / n / ac protocols, with a transmission rate of up to 300Mbps and an effective coverage range of 0-10 meters. It also integrates a Bluetooth auxiliary connection unit using the BLE 5.0 protocol, enabling quick pairing of mobile devices, computers, and the projection host. Upon successful pairing, it automatically switches to Wi-Fi projection connection. Furthermore, this module supports the Wi-Fi Direct protocol, allowing for point-to-point direct connection between the projection host and external electronic devices in environments without wireless access points (APs) (such as in networked conference rooms), expanding the flexibility of usage scenarios.

[0026] Gravity sensor module: It adopts a three-axis accelerometer model ADXL345 with a sampling frequency of 30Hz (within the range of 10Hz-50Hz). It can accurately capture the placement posture of the projection host (horizontal or vertical screen) and transmit the posture data to the central control unit in real time, providing data support for adaptive adjustment of the display direction.

[0027] Touch display module: It adopts a 10.1-inch IPS display panel with a resolution of 1920×1200 to ensure clear and delicate projection images; the display panel integrates display scaling adjustment buttons (including zoom in and zoom out buttons) for controlling proportional scaling. The buttons adopt a capacitive touch design with a response time of ≤10ms. After the user touches the screen, the scaling command can be quickly fed back to the central control unit. The touch chip in the touch display module is ILI2511.

[0028] Signal processing module: It adopts the A3100 processing chip, which supports decoding of various video formats (such as MP4, AVI, MKV, etc.) and has noise reduction and image quality enhancement functions. During the scaling process, it can also apply targeted sharpening processing to help maintain the visual clarity of the image and avoid problems such as blurry text and loss of details.

[0029] QR code generation module: It adopts an STM32F103 microcontroller, which communicates with the central control unit. It can generate a pairing QR code containing the WIFI signal information of the projection host (such as hotspot SSID and password) according to the instructions of the central control unit, and transmit it to the display panel for display, simplifying the connection process between external electronic devices and projection host.

[0030] Storage module: It adopts a 16GB NAND Flash chip to cache temporary data during the screen mirroring process (such as streaming media data to reduce screen lag) and store commonly used user settings (such as default volume, brightness, and list of frequently used devices) to improve the convenience of subsequent use.

[0031] Example 2: Detailed process of screen mirroring method like Figure 2 As shown, the screen mirroring method in this embodiment has the following specific steps: S1: System initialization and startup When the screen projection host is started, the central control unit controls each module to complete the initialization; the wireless communication module enables the WIFI signal transmission function (SSID is "SmartCast-XXXX", and can also enable the Wi-FiDirect mode for scenarios without network), and the screen projection host enters the screen projection waiting state; the storage module automatically loads the user's historical settings parameters (such as default brightness and volume) and applies them to the touch display module simultaneously.

[0032] S2: Establish wireless connection to the device Users can establish an initial connection with the screen projection host by operating external electronic devices (such as Apple iPhone 14, Windows 11 laptops, etc.): Method 1 (Bluetooth assisted pairing): The external electronic device turns on Bluetooth, searches for and pairs with the Bluetooth signal of the screen projection host. After successful pairing, it will automatically connect to the WIFI signal of the screen projection host. Method 2 (Direct WIFI Connection): External electronic devices can directly search for and connect to the hotspot of the screen mirroring host in the WIFI settings; Method 3 (Wi-Fi Direct Connection): In the absence of a network, external electronic devices enable the Wi-Fi Direct function to establish a point-to-point direct connection with the projection host.

[0033] S3: Defaults to the first screen mirroring mode After a successful connection, the central control unit defaults to the first screen projection mode (real-time synchronous mirroring mode). The screen of the external electronic device is transmitted to the signal processing module via the wireless communication module. The signal processing module decodes, reduces noise, and optimizes the image quality of the image signal before transmitting it to the display panel of the touch display module, thus achieving real-time synchronous screen projection of the external electronic device's screen. At this time, the operation of the external electronic device is consistent with the projected screen.

[0034] S4: Display orientation adaptive adjustment During the projection process, the gravity sensor module continuously collects the attitude data of the projection host at a frequency of 30Hz and transmits it to the central control unit in real time. If the user changes the projection host from landscape to portrait (or vice versa), after receiving the attitude change data, the central control unit controls the projection screen on the display panel to switch the display direction synchronously within 30ms (or within 50ms). There is no screen lag during the adjustment process, ensuring that the display screen matches the placement of the host.

[0035] S5: Lossless Image Scaling Control If the user needs to view the details of the projected screen, press the zoom button on the display zoom adjustment panel. After receiving the instruction, the central control unit calls the graphics scaling engine (which can use bilinear interpolation, bicubic interpolation, Lanczos interpolation algorithm, or deep learning-based super-resolution technology) to control the projected screen to be zoomed in at a 10% gradient while maintaining the aspect ratio without loss. After pressing the button three times in a row, the screen can be zoomed in to 130% of the original screen (the zoom range is 50%-200% of the original screen). If the screen needs to be zoomed out, press the "zoom out" button. During the entire zooming process, the signal processing module performs sharpening processing simultaneously to ensure that there is no significant loss of image clarity.

[0036] S6: Switch to the second screen mirroring mode When a user needs to independently operate an external electronic device during screen mirroring (such as replying to WeChat messages or searching for information), they can send a mode switching command through the screen mirroring control APP on the external electronic device. After receiving the switching command, the central control unit controls the QR code generation module to generate a new pairing QR code and display it in the upper right corner of the display panel.

[0037] S7: Second screen mirroring mode in operation Users open WeChat (or other applications with QR code scanning capabilities) on their external electronic devices, scan the pairing QR code on the display panel, and the external electronic device and the projection host share the same Wi-Fi signal in the same area. Users select target media content (video, pictures, documents, etc.) in the video app (or document app) of the external electronic device and click "project". The wireless communication module of the projection host receives the projection signal of the target media content, and after processing by the signal processing module, the target media content is continuously played on the display panel. At this time, the external electronic device can freely switch to other interfaces such as chat and office, and the operation interface is independent of the projection screen, and the two do not interfere with each other.

[0038] S8: Screen mirroring ends and standby mode After the video (or other media content) finishes playing, the user can click "Disconnect" in the screen mirroring control APP of the external electronic device. After receiving the command, the screen mirroring host will disconnect from the external electronic device. If the user does not manually disconnect, the screen mirroring host will automatically disconnect after 3 minutes of no signal input, and the central control unit will control each module to enter a low-power standby state to reduce energy consumption.

[0039] The system and method of this embodiment, through clear hardware configuration and standardized process design, realize multi-device compatible screen projection, adaptive adjustment of display direction, lossless scaling while maintaining aspect ratio, and dual-mode screen projection functions. Each module works collaboratively under the scheduling of the central control unit, effectively solving the technical defects of existing wireless screen projection devices such as poor compatibility, inconvenient display adjustment, and conflicts between screen projection and device operation. It has significant creativity and practicality and is suitable for various scenarios such as office presentations, home movie viewing, and teaching demonstrations.

[0040] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A wireless screen projection system with vector scaling of display screen size, characterized in that, It includes a projection host, a wireless communication module, a gravity sensing module, a touch display module, a signal processing module, and a central control unit; the wireless communication module, gravity sensing module, touch display module, and signal processing module are all electrically connected to the central control unit; The wireless communication module supports the IEEE 802.11b / g / n / ac protocol and is used to establish a wireless connection between the projection host and external electronic devices and transmit projection signals. The gravity sensing module uses a three-axis accelerometer to collect the attitude data of the projection host. The touch display module includes a display panel for displaying the projected image; the projection host also includes display scaling adjustment buttons electrically connected to the central control unit; The signal processing module is also configured to temporarily store the projection signal with black border transmitted by the external electronic device in the chip's DDR memory for the central control unit to analyze the black border area. The central control unit is configured to: adaptively adjust the display direction of the projected image based on the attitude data collected by the gravity sensing module; and, in response to the operation of the display scaling adjustment button, control the projected image to be proportionally enlarged and the black borders cropped (the cropping range can be set as needed) based on the image data in the chip's DDR memory, so as to achieve lossless display while maintaining the aspect ratio.

2. The wireless projection system with vector scaling of display screen size according to claim 1, characterized in that, It also includes a QR code generation module electrically connected to the central control unit, used to generate a pairing QR code containing connection information and display it on the display panel.

3. The wireless projection system with vector scaling of display screen size according to claim 2, characterized in that, The system supports at least two screen mirroring modes: The first projection mode is used to project the screen of the external electronic device onto the display panel in real time. The second screen mirroring mode is activated in response to the external electronic device scanning the pairing QR code and establishing a connection. This mode is used to continuously play target media content from the external electronic device, and the user interface of the external electronic device is independent of the screen mirroring screen.

4. The wireless projection system with vector scaling of display screen size according to claim 1, characterized in that, The display scaling adjustment buttons include a zoom-in button and a zoom-out button, used to control the projection screen to scale according to a preset gradient.

5. The wireless projection system with vector scaling of display screen size according to claim 1, characterized in that, The wireless communication module also integrates a Bluetooth unit for assisting in quick pairing.

6. The wireless projection system with vector scaling of display screen size according to claim 1, characterized in that, It also includes a storage module electrically connected to the central control unit for caching screen projection data or user setting parameters.

7. The wireless projection system with vector scaling of display screen size according to claim 1, characterized in that, The central control unit achieves lossless scaling while maintaining aspect ratio through bilinear interpolation, bicubic interpolation, Lanczos-based interpolation algorithm, or deep learning-based super-resolution technology. The central control unit identifies the black border area of ​​the projected image in the chip's DDR memory using a pixel brightness threshold algorithm. The cropping width of the black border area can be adjusted in real time according to the display panel resolution and the target display ratio. The display scaling adjustment button is a self-resetting tactile switch, which is electrically connected to the central control unit through a GPIO interface. The button trigger response time is ≤5ms.

8. The wireless projection system with vector scaling of display screen size according to claim 1, characterized in that, The wireless communication module also supports the Wi-FiDirect protocol, which is used to establish a point-to-point direct connection between the projection host and external electronic devices in a network-free environment.

9. The wireless projection system with vector scaling of display screen size according to claim 1, characterized in that, The signal processing module simultaneously sharpens or reduces noise on the projected image during the scaling process to help maintain visual clarity.

10. The screen projection method of the wireless screen projection system with vector scaling of display screen size according to any one of claims 1 to 9, characterized in that, Includes the following steps: S1: Start the screen projection host, the central control unit controls the initialization of each module, the wireless communication module enables the WIFI signal transmission function (Wi-FiDirect mode can be enabled at the same time), and the screen projection host enters the screen projection waiting state. S2: Users can complete the initial connection by operating external electronic devices (such as Apple iPhone 14, Windows 11 laptops, etc.) in the following ways: Method 1: Turn on Bluetooth, search for and pair with the screen mirroring host's Bluetooth signal, and automatically connect to WIFI after successful pairing; Method 2: Directly search for and connect to the screen mirroring host's Wi-Fi signal in the Wi-Fi settings; Method 3: When there is no network, enable the Wi-FiDirect function to establish a direct point-to-point connection with the screen projection host; S3: The central control unit starts the first screen projection mode by default. The screen image of the external electronic device is transmitted to the signal processing module via the wireless communication module. After the signal processing module decodes and reduces noise, it is transmitted to the display panel of the touch display module to achieve real-time synchronous screen projection. S4: During the screen projection process, when the user switches the projection host from landscape to portrait mode, the gravity sensor module collects the attitude change data and transmits it to the central control unit. The central control unit controls the screen projection image on the display panel to switch from landscape to portrait mode within 30ms, and the switching process is smooth. S5: When the user presses the zoom button on the display zoom adjustment button, the central control unit receives the instruction and calls the corresponding algorithm to control the screen projection to be zoomed in losslessly while maintaining the aspect ratio according to the preset gradient. There is no significant loss of image clarity during the zooming process. S6: When a user needs to operate an external electronic device independently, they can switch to the second projection mode through the projection control interface of the external electronic device. After receiving the switching command, the central control unit controls the QR code generation module to generate a pairing QR code, which is displayed in the upper right corner of the display panel. S7: Users scan the pairing QR code on the display panel using an external electronic device. The external electronic device establishes a connection with the screen casting host. Users then select the target video in the video app on the external electronic device and click "Screen Cast". S8: The wireless communication module of the screen casting host receives the screen casting signal of the target video. After being processed by the signal processing module, the target video is continuously played on the display panel. External electronic devices can freely switch to other interfaces such as chat and office, and the screen casting signal is not affected. S9: After the video playback ends, the user clicks "Disconnect" in the screen mirroring control interface of the external electronic device. The screen mirroring host disconnects from the external electronic device, and the central control unit controls each module to enter a low-power standby state. If the user does not manually disconnect, the screen mirroring host will automatically enter standby state after 3 minutes of no signal input.

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