A wireless projector supporting touch back control mobile phone function

Abstract

The utility model discloses a kind of wireless screen projection of supporting touch reverse control mobile phone function, including main control chip, TP module, WIFI module, TFT module, bluetooth module, power amplifier module, loudspeaker module and power supply module.The screen projector receives mobile phone mirror picture by WIFI module and is shown by TFT module, TP module is used to collect touch operation and is returned to mobile phone by main control chip, realizes reverse control function;Remote photograph control is realized by bluetooth module cooperation remote controller.The device cancels traditional physical key, adopts touch mode control, improves interactive convenience, has magnetic attraction connection and audio and video output capacity, applicable to selfie and screen projection scene.

Description

Technical Field

[0001] This utility model relates to a mobile phone accessory, specifically a wireless screen projector that supports touch-screen control of mobile phones. Background Technology

[0002] As mobile devices become increasingly sophisticated, users are demanding more synchronized display and interactive control of their phone content on large-screen devices. Traditional screen mirroring devices typically transmit the phone screen to an external display via Wi-Fi for video playback, office presentations, and gaming. However, existing screen mirroring devices generally suffer from weak interactivity and limited control methods, relying primarily on physical buttons or external remote controls for basic operations. They cannot achieve real-time touch-based reverse control of the phone, thus restricting user convenience and functional expandability.

[0003] Furthermore, most current screen mirroring devices on the market lack touchscreen functionality, supporting only image projection and failing to enable synchronized operation and feedback control of the phone from the projection device. Users still need to return to their phones for interaction, resulting in a poor user experience. Therefore, there is an urgent need for a compact, highly integrated wireless screen mirroring device that supports touch control of the phone to improve operational efficiency and user experience. Utility Model Content

[0004] To address the aforementioned issues, this invention provides a wireless screen projector that supports touch-screen control of mobile phones, effectively overcoming the shortcomings of existing technologies.

[0005] This utility model is achieved through the following technical solution: a wireless screen projector supporting touch-screen control of mobile phones, comprising:

[0006] The main control chip is used to realize data processing, wireless communication control, and display control;

[0007] The TP module is used to receive user touch operation signals and send them to the main control chip via the IIC bus;

[0008] The WIFI module is connected to the main control chip and is used to transmit the mobile phone screen to the main control chip via wireless signal, and to realize the reverse control communication between the main control chip and the mobile phone.

[0009] The TFT module is electrically connected to the main control chip and is used to display the mobile phone image received by the WIFI module;

[0010] The Bluetooth module is connected to the main control chip via UART and is used to realize Bluetooth remote control shooting control;

[0011] The power amplifier module is connected to the main control chip and is used for amplifying and outputting audio signals;

[0012] The speaker module, connected to the power amplifier module, is used to play sound;

[0013] The power supply module is used to provide SYS_3.3V and VDD_CORE0.9V power to the main control chip and various functional modules;

[0014] The main control chip is also connected to an Apple MCU chip for MFI communication with compatible devices.

[0015] Furthermore, the TP module is installed on the surface of the display screen, enabling touch control without physical buttons. The touch signal is transmitted back to the mobile phone by the main control chip to achieve reverse control operation.

[0016] As a preferred technical solution, the TP module is disposed on the front of the TFT module and is used to collect user operations and transmit them to the main control chip.

[0017] As a preferred technical solution, the WIFI module is connected to an external WIFI antenna to enhance signal strength and transmission distance.

[0018] As a preferred technical solution, the Bluetooth module is connected to an external Bluetooth antenna and supports pairing with a Bluetooth remote control to realize remote control shooting function.

[0019] As a preferred technical solution, the main control chip is connected to a 16M SPI Flash via an IIC bus for storing and calling system programs.

[0020] As a preferred technical solution, an OSC24MH crystal oscillator module is also included to provide clock signals to the main control chip.

[0021] As a preferred technical solution, a magnetic structure is also included to magnetically fix the screen projector to the back of the mobile phone.

[0022] As a preferred technical solution, the power supply module includes a USB power supply interface, a battery assembly, and a boost circuit, used to provide a stable voltage for the system.

[0023] As a preferred technical solution, the device also includes a remote control and a magnetic stripe. The remote control communicates with the main control chip via a Bluetooth module, and the magnetic stripe is disposed on the back of the mobile phone to enhance the stability of the magnetic connection.

[0024] The beneficial effects of this utility model are: by integrating the TP touch module onto the surface of the display screen, users can directly perform touch operations on the screen projector, replacing the traditional button control method, thus improving the product's intelligence and ease of operation.

[0025] The main control chip identifies and processes touch signals and sends operation commands back to the mobile phone, enabling users to control the mobile phone interface in reverse on the projected screen, thus meeting the remote interaction needs in diverse scenarios.

[0026] By connecting to a mobile phone via Bluetooth module and combining with a Bluetooth remote control, remote photo control can be achieved, which is especially suitable for mobile imaging applications such as selfies and video recording. It is practical and highly expandable.

[0027] This screen projector can be magnetically attached to the back of a mobile phone, making it easy to install and remove, enhancing the portability and stability of the device, and adapting to different usage environments. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a system block diagram of the present invention;

[0030] Figure 2 This is a circuit diagram of the main control core and wireless communication part of this utility model;

[0031] Figure 3 This is a circuit diagram of the Bluetooth module and audio output module of this utility model;

[0032] Figure 4 This is the circuit diagram of the power amplifier module of this utility model;

[0033] Figure 5 This is the circuit diagram of the power supply module of this utility model. Detailed Implementation

[0034] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0035] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features for a similar purpose, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0036] like Figures 1-5 As shown, the present invention provides a wireless screen projector that supports touch-screen control of mobile phones, and its specific implementation method is described below.

[0037] This projection device's overall system uses the highly integrated F133 series main control chip as its core control unit. This main control chip is an embedded processor, model F133-64QFP128, which features multiple peripheral interfaces including USB, SDIO, LCD, TPADC, UART, SPI, and I2C. This chip is responsible not only for data processing, image decoding, command scheduling, and communication forwarding throughout the system, but also for centralized control and coordinated operation of peripheral modules through its integrated control interface.

[0038] In terms of image display, this device uses a TFT LCD module as the display end for the mirrored image. The TFT module is connected to the main control chip via parallel port signals, and the connection pins include LCD_D0 to LCD_D7, LCD_CLK, LCD_DE, LCD_HSYNC, LCD_VSYNC, etc.

[0039] After level matching, the above signals directly drive the TFT display screen to output images. The main control chip receives the video stream from the WIFI module, decodes and buffers it, and then drives the screen to display it frame by frame through the LCD interface, achieving real-time mobile phone mirroring.

[0040] The touch function module adopts a capacitive TP module, which has a four-wire electrode structure, including four pins: TP_X1, TP_X2, TP_Y1, and TP_Y2.

[0041] In the circuit diagram, this part of the pins is connected to the TPADC module of the main control chip, which is used to collect the piezoelectric signal generated by the user's touch. The signal is input to the main control chip through the TP line for AD conversion to calculate the touch coordinate position.

[0042] By combining the image coordinate system, the main control chip can parse user actions such as swiping, clicking, and double-tapping on the screen into standard operation events. Since the TP module is mounted on the TFT screen surface, it achieves an innovative design that eliminates traditional physical buttons, replacing button control with touch, thus enhancing the product's human-computer interaction experience.

[0043] By parsing the coordinate events, the main control chip further generates control commands from the touch events and sends them back to the mobile phone via the wireless communication interface, enabling remote touch control of the mobile phone system (such as back, swipe, click, etc.). This creates a mechanism that allows for synchronous control on the projection end without directly operating the mobile phone.

[0044] The wireless image transmission section uses a WIFI module as the communication medium. The WIFI module is connected to the main control chip through a USB or SDIO interface. As can be seen in the drawings, it achieves high-speed communication through the USB0_DP and USB0_DM interfaces, and the data path is clear.

[0045] The module supports the 802.11n protocol in the 2.4GHz band. When used with an external PCB Wi-Fi antenna, it can achieve stable data transmission rates to meet the needs of high-definition video projection. In the circuit diagram at the top right, the Wi-Fi module's antenna port is connected to a matching network. A π-type network, consisting of capacitors, inductors, and a grounding resistor, is used for impedance matching, ensuring a 50-ohm match between the antenna and the RF circuit, reducing signal reflection and loss. This demonstrates that the module design not only considers functional implementation but also signal integrity and anti-interference capabilities.

[0046] The Bluetooth module is located on the system's UART serial communication channel and communicates bidirectionally with the main control chip via TXD and RXD. The Bluetooth module is used to establish a pairing connection with the Bluetooth remote control to achieve functions such as remote control shooting. In the circuit diagram, the antenna part of this module is connected to an independent Bluetooth antenna via the BT_ANT pin, improving the stability and transmission distance of Bluetooth communication. The Bluetooth module integrates an audio protocol stack and serial port pass-through function. The main control chip can control the paired mobile phone of the Bluetooth remote control to perform actions such as taking pictures by sending a photo-taking command.

[0047] To achieve local audio playback, this system integrates a complete audio amplification and output circuit. The main control chip provides audio signals through two analog audio output channels, DACL and DAR. These two pin signals are shown in the "Power Amplifier Selection" module in the figure. They enter the resistor network through coupling capacitors C55 and C48, respectively, and are then fed into the audio input terminal of the power amplifier chip HB4890 through an attenuation channel formed by R35, R91, etc.

[0048] The HB4890 is a digital audio amplifier with integrated dual-channel audio amplification. Its +OUT and –OUT outputs are respectively connected to dual-channel speaker units. The amplifier chip's VDD is powered by a 5V boost power supply. Inductors L5, L27, and L29, along with bypass capacitors, form an LC filter network to further improve the purity of the audio signal and suppress high-frequency interference. The final output connects to a standard 2-pin speaker connector for clear and powerful audio playback.

[0049] The stable operation of the system relies on the support of an efficient power supply circuit. The entire system is powered by a 5V input via the USB port, which is then converted to a DC-DC step-down voltage by the ST3470 boost chip. In the "Power Supply Module" section of the circuit diagram, the BS, LX, and EN pins of this chip, along with feedback resistors R4, R8, and R7 and the L2 boost inductor, work to output a stable 0.9V core voltage (VDD_CORE_0.9V) and a 3.3V system voltage (SYS_3.3V), supplying power to the main control chip core and peripheral circuits respectively. Capacitors C23 and C34 provide voltage smoothing, ensuring power stability during chip startup and operation. This circuit features high efficiency, low heat generation, and fast response, meeting the power supply requirements of high-performance embedded systems.

[0050] To achieve compatibility and authorization certification for Apple devices, this utility model is further equipped with an Apple certification chip that supports the MFI protocol. In this embodiment, the MCU6209 model is selected.

[0051] This chip connects to the main control chip via the IIC bus. Its SCL and SDA pins are connected to the corresponding I / O ports of the main control chip, and are configured with necessary pull-up resistors to ensure stable and reliable IIC communication. In the circuit diagram, the chip's power supply pins are connected to the MCU's 3.3V power rail, and its peripheral components include filter capacitors and current-limiting resistors to ensure power supply stability and signal integrity.

[0052] During the system initialization phase, Apple's MCU chip completes the handshake authentication with the iOS device, realizing device-level identity recognition and authorization. This allows the screen mirroring device to legally establish a connection with Apple devices and perform advanced operations such as screen mirroring and touch control.

[0053] In this system, the display module and touch module are integrated into a single package, with the TP module glued and fixed to the front of the TFT LCD module. The touch panel uses a G+G structure, offering good transparency and durability, and its control chip supports multi-point capacitive touch recognition.

[0054] Since the touch module and the main control chip use IIC communication and the chip has a built-in TP ADC interface, the touch position can be read and analyzed without an additional control chip. After the user completes the click or swipe action on the display screen, the touch signal is sent to the TPADC module in the main control chip through the TP_X1 / X2 and TP_Y1 / Y2 pins, and the touch position coordinates are identified by the capacitance difference detection.

[0055] The main control chip associates the coordinates with the currently displayed content, converts them into a reverse control command, and transmits it back to the mobile phone via WIFI, so that the icons or buttons on the mobile phone interface can respond to the corresponding operation, realizing a complete "screen projection + reverse control" closed loop.

[0056] This device employs a magnetic structure to enhance portability and compactness. In its hardware structure, the TFT+TP module and the main control circuit board share a single PCB substrate. A set of ring-shaped neodymium magnets is embedded in the back cover of the entire device, while the magnetic attractor included with the projector is attached to the back of the phone. Users do not need an additional stand; simply align the device with the back of the phone for stable magnetic attachment, making it easy to remove without affecting normal phone use. Furthermore, this structure, through optimized magnetic field strength and thickness design, ensures good adhesion even during vibration or photography, improving the overall user experience.

[0057] To facilitate remote control operation, this system is also equipped with a Bluetooth remote control. This remote control contains a low-power Bluetooth chip, a battery power module, button circuitry, and LED indicator circuitry. Upon initial use, the remote control automatically enters pairing mode after the user flips its switch.

[0058] Simply turn on Bluetooth on your phone and search for paired devices to complete the pairing process with the remote control. After pairing, users can remotely control the screen projector to trigger a photo-taking command via the buttons on the remote control. This command is transmitted to the main control chip via the Bluetooth module, which then converts the command into an operation signal compatible with the phone and transmits it back to the phone via Wi-Fi or Bluetooth, thereby triggering the camera app to take a picture. This function is particularly suitable for scenarios such as single-person shooting and long-distance timed selfies, enhancing the product's flexibility and intelligence.

[0059] In the charging and power management section of the system, this invention sets up a complete charging detection and battery management circuit, which includes a CHARGE pin, a CHARGE_FULL pin, and corresponding resistor current limiting and LED indicator lines. The power management module supports inputting 5V voltage from the USB port to charge the built-in battery while simultaneously monitoring the battery voltage status.

[0060] When the battery voltage falls below a set threshold, the BETT_DET pin outputs a low level. The main control chip then performs low-voltage protection based on the detection result, such as reducing display brightness or shutting down some peripherals, to extend device battery life and protect battery safety. This module also includes a temperature control sampling channel and a button input detection interface, facilitating future expansion with more control functions.

[0061] During the system initialization process of the main control chip, the following tasks will be completed sequentially: power detection, clock configuration, peripheral interface initialization, WIFI connection, Bluetooth activation, TP module calibration, and TFT image buffering. The clock source is provided by an external crystal oscillator module OSC24MH. As shown in the main control circuit diagram, the transistor pins XTAL_IN and XTAL_OUT are connected to a 24MHz crystal and equipped with stabilizing capacitors to ensure the accuracy of the main control chip's clock signal, supporting the stable operation of the entire system and the synchronous scheduling of multiple modules.

[0062] For system storage, the main control chip connects to a 16Mbit SPI Flash via an SPI interface to store program code, user configuration, image cache, and other information. The circuit diagram clearly shows that the main control chip's SPI_CS, SPI_CLK, SPI_MOSI, and SPI_MISO pins are connected to the corresponding pins of the Flash chip, with pull-up resistors and data protection capacitors externally configured to ensure signal integrity during high-speed communication. This storage chip supports power-off data retention and on-chip erase / write operations, exhibiting excellent reprogrammability.

[0063] Regarding low-power management, this invention supports standby and hibernation control. When the user does not operate the touch interface or Bluetooth remote control for an extended period, the main control chip automatically turns off the display backlight and enters a low-frequency operating state, retaining only the TP and Bluetooth module polling activation signals, thereby reducing overall power consumption. When the user taps the screen again or presses a button on the remote control, the system immediately wakes up and resumes full-speed operation. This mechanism improves the device's battery life, making it particularly suitable for outdoor scenarios or long-term video projection needs.

[0064] Starting from the main control chip, this utility model sequentially integrates a WIFI communication module for receiving the projected screen, a TFT module for image display, and a TP touch module for collecting touch coordinate information, which is then parsed by the main control chip and fed back to the mobile phone via WIFI to form a reverse control.

[0065] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions conceived without inventive effort should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope defined in the claims.

Claims

1. A wireless screen projector supporting touch-screen control of a mobile phone, characterized in that, include: The main control chip is used to realize data processing, wireless communication control, and display control; The TP module is used to receive user touch operation signals and send them to the main control chip via the IIC bus; The WIFI module is connected to the main control chip and is used to transmit the mobile phone screen to the main control chip via wireless signal, and to realize the reverse control communication between the main control chip and the mobile phone. The TFT module is electrically connected to the main control chip and is used to display the mobile phone image received by the WIFI module; The Bluetooth module is connected to the main control chip via UART and is used to realize Bluetooth remote control shooting control; The power amplifier module is connected to the main control chip and is used for amplifying and outputting audio signals; The speaker module, connected to the power amplifier module, is used to play sound; The power supply module is used to provide SYS_3.3V and VDD_CORE0.9V power to the main control chip and various functional modules; The main control chip is also connected to an Apple MCU chip for MFI communication with compatible devices. Furthermore, the TP module is installed on the surface of the display screen, enabling touch control without physical buttons. The touch signal is transmitted back to the mobile phone by the main control chip to achieve reverse control operation.

2. The wireless screen projector supporting touch-screen control of mobile phones according to claim 1, characterized in that: The TP module is located on the front of the TFT module and is used to collect user operations and transmit them to the main control chip.

3. The wireless screen projector supporting touch-screen control of mobile phones according to claim 1, characterized in that: The WIFI module is connected to an external WIFI antenna to enhance signal strength and transmission distance.

4. The wireless screen projector supporting touch-screen control of mobile phones according to claim 1, characterized in that: The Bluetooth module is connected to an external Bluetooth antenna and supports pairing with a Bluetooth remote control to enable remote control shooting.

5. The wireless screen projector supporting touch-screen reverse control of mobile phones according to claim 1, characterized in that: The main control chip is connected to a 16M SPI Flash via an IIC bus for storing and calling system programs.

6. The wireless screen projector supporting touch-screen control of mobile phones according to claim 1, characterized in that: It also includes a crystal oscillator module OSC24MH, which is used to provide clock signals to the main control chip.

7. The wireless screen projector supporting touch-screen control of mobile phones according to claim 1, characterized in that: It also includes a magnetic structure for magnetically attaching the projector to the back of the phone.

8. The wireless screen projector supporting touch-screen control of mobile phones according to claim 1, characterized in that: The power supply module includes a USB power interface, a battery assembly, and a boost circuit to provide a stable voltage for the system.

9. The wireless screen projector supporting touch-screen control of mobile phones according to claim 1, characterized in that: It also includes a remote control and a magnetic strip. The remote control communicates with the main control chip via a Bluetooth module, and the magnetic strip is set on the back of the mobile phone to enhance the stability of the magnetic connection.

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