Mobile phone digital back screen display method and system based on file node independent control

Abstract

The invention discloses a mobile phone digital back screen display method and system based on file node independent control, and aims at solving the problems that an existing back screen technology is complex in control, single in function and high in coupling degree. The core of the method is as follows: an independent control program directly reads file nodes of a mobile phone system so as to obtain data such as battery power and a sensor; when it is judged that a screen lightening condition is met based on sensor data (such as an overturning angle), the program directly writes an instruction into a driving node of the digital back screen, controls the driving node to be lightened and displays information; according to the method, a traditional complex communication protocol depending on main screen transfer is abandoned, low-delay, low-power-consumption and low-coupling-degree back screen control is achieved, the rich functions of turning on the screen, positioning the date, the regional temperature and humidity and the like are integrated, and the user experience is remarkably improved; the system comprises a corresponding hardware architecture and a software module.

Description

A Method and System for Mobile Digital Back Screen Display Based on Independent File Node Control Technical Field

[0001] This invention relates to the field of back screen display control for mobile terminals, and more particularly to a display control method and system for a digital back screen of a smartphone. Background Technology

[0002] With the development of dual-screen technology in smartphones (hereinafter referred to as mobile phones), users' demand for "accessing key information without unlocking" is growing. In order to meet users' demand for "accessing key information without unlocking the main screen", mobile phone design schemes equipped with a back screen are gradually increasing; and the back screen, as a supplementary display carrier to the main screen, is gradually becoming an important component for improving user experience.

[0003] Currently, mainstream back screen solutions are mainly divided into two categories: one is a simple back screen based on LED lamp bead array (such as the secondary screen of some feature phones), and the other is an auxiliary touch screen integrated into foldable screen phones. Among them, LED back screens are widely used in low-end and mid-range models due to their low cost and simple structure. However, due to limitations in display principles and control architecture, their low cost and single display function cannot meet the needs of refined and low-power information display. On the other hand, although foldable screen auxiliary touch screens have high display accuracy, they rely on deep coupling control of the main system, have complex control logic, and are expensive and consume a lot of power, making them unsuitable for single back screen scenarios in mass-market models.

[0004] For example, traditional LED lamp bead back screen solutions (such as patent CN202320123456.7) use 8×8 or 16×16 LED lamp bead arrays, communicate with the main screen motherboard through the SPI protocol, and only support fixed icons (such as battery symbols and time numbers) for display content. Control commands need to be issued by the main screen system process. If the screen is on, the main screen needs to first determine whether it is in the off state, and then send 3 frames of SPI commands (command 1: communication handshake; command 2: screen on parameters; command 3: execution confirmation).

[0005] For example, an integrated touch sub-screen solution (such as patent CN202210345678.9) uses an LCD touch screen and is deeply coupled with the main screen through the MIPI protocol. The displayed content depends on the UI rendering of the main screen. Although it supports multiple data displays, it requires the main screen's CPU resources (about 5%-8%) and has no independent control unit. When the main screen lags or crashes, the sub-screen will fail synchronously.

[0006] For example, the local sensor back screen solution (such as patent CN202120567890.1): The back screen integrates a local temperature and humidity sensor, communicates with the main screen through the I2C protocol, can only display local sensor data, cannot associate with device location information, and the data update needs to be read and forwarded by the main screen at regular intervals, with a delay of ≥300ms.

[0007] However, the aforementioned existing technologies (such as patent CN202320123456.7, etc.) generally have the following drawbacks: complex control and communication architecture, relying on multi-line communication protocols such as SPI and MIPI, resulting in high communication latency and high failure rate; limited functionality and poor scalability; and all control needs to be relayed through the main screen system, resulting in high coupling, high development complexity, and poor user experience. Their core drawbacks are mainly the following three points: 1) Control and communication architecture defects: the above solutions all rely on complex multi-protocol communication (SPI / MIPI / I2C) with the main screen, requiring a three-step process of "instruction handshake - data verification - feedback confirmation," with a communication interruption rate ≥5% (e.g., line interference, excessive main screen resource consumption), and additional development of a "main screen-back screen operation differentiation algorithm" (e.g., through GPIO pins). 1) Determine the source of the operation to avoid operation conflicts and increase development complexity; 2) Functional and accuracy limitations: The LED lamp bead back screen only supports fixed icons and cannot display dynamic charging status or switch temperature and humidity units (Fahrenheit / Celsius); Although the integrated touch sub-screen has high accuracy, it does not have the "flip to light up" function and the power consumption is ≥150mAh / day; The local sensor solution data has no positioning correlation and the accuracy is only ±1℃ / ±5%RH, which cannot meet the regional level accurate display requirements; 3) Poor coupling and scalability: The above solutions all rely on the main screen control and have no independent data acquisition capability. Adding new functions (such as location date adaptation) requires modifying the underlying driver of the main screen, and the development cycle is ≥2 weeks; Moreover, there is no independent configuration entry. Users need to enter the three-level menu of "Settings-Display-Sub-Screen" on the main screen to adjust parameters, which is inefficient.

[0008] Therefore, there is an urgent need in this field to develop a digital back screen display control solution for mobile phones (i.e., smartphones) that is loosely coupled, highly reliable, and feature-rich. Summary of the Invention

[0009] To address the technical problems of existing mobile phone back screen solutions, such as "complex control and communication, single function, high coupling, and insufficient precision," this invention proposes a mobile phone digital back screen display control method and system based on independent control program and file node reading. Its core technical solution is as follows: Hardware level: A dot-matrix digital back screen + independent control chip (such as CN91C4S48) is used, connected to the mobile phone motherboard via a single-channel UART bus, eliminating the need for multi-line communication in traditional LE back screens. As shown in Figure 1, the hardware system of this invention mainly includes a digital back screen unit (101), a smartphone system (102), and a power supply module (103). The digital back screen uses a dot-matrix screen, connected to the mobile phone motherboard via an independent control chip (such as CN91C4S48), with a single-channel UART bus communication interface requiring only two signal lines.

[0010] At the software level: Develop an independent control program to read system callback data such as BatteryManager and SensorManager on the mobile phone system, read the mobile phone battery information and sensor data information, and realize data acquisition and control response without communication dependency; as shown in Figure 2, the software system includes a data reading module (201), a data processing module (202), a display control module (203), a power consumption control module (204), a user configuration module (205), and an exception handling module (206).

[0011] Based on the above architecture, this invention realizes functions such as "screen turning on after the main screen is off (automatically turning off after 15 seconds)," "dynamic display of battery charging status," "location country and date adaptation," "precise display of regional temperature and humidity," and "settings for independent APP control."

[0012] Experimental data show that the control latency of this invention is reduced from ≥500ms to ≤100ms, the communication failure rate is reduced from ≥5% to below 0.1%, the average daily power consumption is ≤10mAh, the data accuracy is improved to ±0.3℃ / ±2%RH, the development cycle is shortened to 2 days (new functions only require the development of file node reading logic or callback data of other system managers), and the user operation steps are reduced from 3 steps to 1 step, significantly improving the reliability, functionality and user experience of the back screen.

[0013] The core innovation of the mobile phone digital back screen display method and system based on file node independent control provided by this invention lies in the fact that by developing a control program independent of the main screen UI system, it directly reads the file nodes of the mobile phone system (such as through system service callbacks such as BatteryManager and SensorManager) to obtain data and directly controls the display of the digital back screen, thereby bypassing the main screen command relay link required in traditional solutions, and achieving independent control with low latency, low power consumption, low coupling and rich functionality.

[0014] Compared with the prior art, the present invention has the following significant advantages: 1. Low coupling and high reliability: By adopting the "independent file node reading" architecture, the complex multi-line communication protocol is eliminated, the control latency is reduced from ≥500ms to ≤100ms, and the communication failure rate is reduced from ≥5% to below 0.1%.

[0015] 2. Rich in features and intelligent: It has achieved innovative functions such as "flip to wake", "precise display of temperature and humidity at the regional level" and "location date adaptation", all of which can run independently without relying on the main screen.

[0016] 3. Low power consumption: Through an independent power consumption control module (such as differentiated timed updates and automatic shutdown), the average daily power consumption can be controlled within 10mAh.

[0017] 4. Easy to develop and excellent user experience: New features only require the development of corresponding file node reading logic, which greatly shortens the development cycle; the independent configuration APP provides users with a first-level menu, and the operation steps are simplified from 3 steps to 1 step. Attached Figure Description

[0018] Figure 1 is a hardware principle block diagram provided in an embodiment of the mobile phone digital back screen display system of the present invention; Figure 2 is a software module flowchart provided in an embodiment of the mobile phone digital back screen display method of the present invention; Figure 3 is a timing diagram of screen-on flip provided in an embodiment of the mobile phone digital back screen display of the present invention; Figure 4 is a file node character control table provided in an embodiment of the mobile phone digital back screen display of the present invention; Figure 5 is a flowchart of positioning data processing provided in an embodiment of the mobile phone digital back screen display of the present invention. Detailed Implementation

[0019] The specific embodiments and examples of the present invention will be described in detail below with reference to the accompanying drawings. The specific embodiments described are only used to explain the present invention and are not intended to limit the specific embodiments of the present invention.

[0020] This invention focuses on the scenario of "low-cost digital back screens for mass-market models". Addressing the problems of complex control communication and limited functionality of existing LED back screens, it proposes a software solution based on independent control of file nodes, filling the technological gap of "low-coupling, high-performance back screens".

[0021] As shown in Figure 1, the hardware architecture of the mobile phone digital back screen display system based on file node independent control of the present invention includes: Digital back screen unit 101: using VA 22.0 10.0, LCD 24.60 17.10, BL 26.20 The 18.70-inch digital screen includes display units for battery icons, temperature and humidity, date and time, etc., and has pixel-level driving capability. It is connected to an independent control unit via two signal lines to receive display control commands. The smart system 102 includes the data source for the digital back screen and runs a smart operating system (such as Android). The power supply module 103 continuously provides a stable voltage power supply to the smart system and the digital back screen unit.

[0022] As shown in Figure 2, the software control module (also known as the software architecture or software module) of the mobile phone digital back screen display system based on file node independent control of the present invention includes: a data reading module 201: periodically reads system data such as battery level and gravity, once every time the screen is turned on or at a fixed time interval, with no communication delay; a data processing module 202: parses the read data, such as calculating the flip angle ≥120° through gravity data (screen Z-axis data <= -9.0 triggers screen on), parsing the time zone and latitude and longitude through the system positioning service, and calling the weather API to obtain the regional temperature and humidity; a display control module 203: based on the processed data, drives the digital back screen to display a dynamic battery icon (lightning animation during charging), locates and adapts the date (such as "month-day-year" / "year-month-day"), and switches the temperature and humidity units (Fahrenheit / Celsius); and a power consumption control module 204: implements "flip-to-wake 1" The logic includes: automatic shutdown, brightness reduction to 10% at night, and differentiated timed updates (once every minute for battery power and once every 15 minutes for temperature and humidity); User configuration module 205: receives configuration instructions from the "Digital Back Screen Control APP" (such as hiding the temperature and humidity display), updates the display parameters, and writes them to EEPROM storage; Anomaly handling module 206: when a file node reading failure or communication interruption is detected, it automatically switches to local backup data (such as local sensor temperature and humidity) to ensure uninterrupted display.

[0023] The key functions of the mobile phone digital back screen display method and system based on file node independent control of this invention include flip-to-light, display control, and positioning and temperature and humidity display. The specific technical solution is as follows: As shown in Figure 3, the implementation steps and timing parameters of the flip-to-light function are as follows: T0 time: The digital back screen controller registers the Sensor listener and listens for real-time data acquisition from the system gravity sensor; T0-T1 (≤50ms): Read the data fed back at T0 time, obtain the gravity values ​​of the x / y / z axes (e.g., x=0.2g, y=-0.8g, z=0.5g), and calculate the flip angle = 135° (≥120° trigger threshold) through software algorithm; T1 time: The digital back screen controller determines the flip angle and writes the control value into the node of the digital back screen. Without the main screen relay, the back screen lights up within T1-T2 (≤50ms), and the total timing delay is ≤100ms; T2 time: Start timing with a timer from the start of screen lighting, and execute the forced shutdown function of the digital back screen after 15 seconds.

[0024] As shown in Figure 4, the core display control flow is designed as follows: `sys / class / dlcd_node / dlcd_fun / dlcd_enable`: 1 -> controls the global on / off state of the digital backlight, 0 -> controls the global off state of the digital backlight; `sys / class / dlcd_node / dlcd_fun / dlcd_backlight`: 1-160 -> controls the brightness of the digital backlight (the higher the value, the brighter and the more power it consumes), 0 -> completely turns off the backlight; `sys / class / dlcd_node / dlcd_fun / dlcd_debug`: `battery` -> controls the display / off state of the battery icon, `time` -> controls the display of the time, `date` -> controls the display of the date, `temp` -> controls the display of the temperature, `humi` -> controls the display of the humidity, `icon` -> controls the display of the humidity. -> This corresponds to the display of other additional areas (such as the ' / ' symbol in the date and time, the charging icon, the Fahrenheit / Celsius symbol, the colon symbol between hours and minutes, etc.); For any area of ​​the digital back screen to be displayed, the dlcd_enable node must be 1, and the dlcd_backlight node value must be between 1 and 106; different parameters in the dlcd_debug node correspond to different digital back screen display areas and different function displays (such as the time area, which cannot be turned off, but the time will be consistent with the phone's system time).

[0025] As shown in Figure 5, the location data adaptation process is as follows: Step 1 (i.e., 301): The mobile device's location service unit obtains the current location information (using Baidu location service in China and Google location service overseas); Step 2 (i.e., 302): Parses the obtained location information (including location latitude and longitude information, time zone information); Step 3 (i.e., 303): If the query is unsuccessful, the time is adjusted according to the time zone (e.g., UTC time 12:35:19 is converted to East 8th zone time 20:35:19) to drive the time and date display on the digital back screen; Step 4 (i.e., 304): Based on the latitude and longitude information, the weather API (https: / / unity.hwprize.com / unity / project / rs / launcherServer) is called to obtain the real-time temperature and humidity information of the current region; Step 5 (i.e., 305): If the query is successful, the user-configured temperature and humidity unit is determined. If it is Fahrenheit, it is converted (22.5×1.8+32=72.5℉) to drive the temperature / humidity display on the digital back screen.

[0026] This invention, a mobile phone digital back screen display method and system based on independent file node control, has the following three key innovations: 1. Innovative control and communication architecture: It proposes a low-coupling architecture of "independent file node reading," replacing the traditional complex SPI / MIPI / I2C communication. It eliminates the need for main screen command relay, achieving a control latency of ≤100ms and a communication failure rate of ≤0.1%, thus solving the core pain points of "high coupling and high failure rate." 2. Innovative functional logic: It integrates three major functions: "flip-to-wake for 15 seconds and automatically turn off," "location-based date and country adaptation," and "precise regional temperature and humidity display," all implemented based on independent control programs without main screen involvement, filling a functional gap in existing technologies. 3. Innovative user interaction: A separate "Digital Back Screen Control" app entry is added to the first-level settings page, supporting display area switching and parameter customization. The operation steps are reduced from 3 to 1, improving the user experience.

[0027] Evaluation data shows that the hardware cost of this invention only increases by 25-40 yuan (15 yuan for the digital screen + 8 yuan for the control chip + 2-7 yuan for circuit components), which is far lower than the 100+ yuan cost of the foldable screen auxiliary touch screen, making it suitable for mass application in popular models; moreover, the software is developed based on C and Java languages, with a code reuse rate of ≥80%, and can be quickly ported to Android / iOS systems, reducing the adaptation costs for manufacturers.

[0028] To address the risk that some mobile operating systems may restrict file node access permissions, leading to data reading failures, the present invention provides a solution: a "permission request module" can be developed to guide users to grant file node access permissions when the app is first launched, or a system-level driver patch can be provided.

[0029] Regarding the risk that weather API calls rely on the network and cannot obtain regional temperature and humidity when there is no network, the solution of this invention is to have a built-in local sensor as a backup, which automatically switches to local data when there is no network, ensuring uninterrupted display.

[0030] In addition, AI algorithms can be introduced to analyze user habits (such as users often checking battery level at 8:00) and intelligently adjust the data update frequency (10 seconds / time within 10 minutes before and after 8:00, and 1 minute / time at other times) to further optimize power consumption; at the same time, a back screen touch function can be developed to support clicking on the back screen to switch displayed content, and interactivity can be improved through technological iteration.

[0031] Based on the above technical solution, the present invention also proposes: a hardware architecture for a mobile phone digital back screen, including a dot matrix OLED digital screen, an independent control chip (CN91C4S48), and a single-channel UART communication circuit. The key point is that the independent control chip is directly connected to the mobile phone system file node interface, eliminating the need for multi-line communication, and the hardware connection only requires 2 signal lines.

[0032] A method for acquiring data from the back screen of a mobile phone is proposed. This method reads system callback data such as BatteryManager and SensorManager on the mobile phone system to obtain mobile phone battery information and sensor data, thereby achieving data acquisition without communication dependencies.

[0033] A mobile phone digital back screen control response method, which detects that "main screen brightness = 0 and flip angle ≥ 120° (screen Z-axis data <= -9.0)", automatically triggers screen lighting and starts a 15-second countdown, without requiring main screen commands.

[0034] A method for adapting mobile phone digital back screen data, which parses the location to obtain the time zone and latitude and longitude, adapts the date format, calls the weather API to obtain the regional temperature and humidity, and supports switching of temperature and humidity units.

[0035] A method for configuring a mobile phone digital back screen allows the user to receive commands through a separate app entry point, update file node read parameters, and write them to EEPROM storage without requiring a main screen as an intermediary.

[0036] Example 1: A typical implementation of the "flip-to-wake" function is shown in Figure 3. The independent control program registers and listens to the gravity sensor at time T0. Within ≤50ms from T0 to T1, it reads the sensor data and calculates the flip angle. If the calculated angle is ≥120° at time T1, it immediately writes "1" to the enable node of the back screen (such as dlcd_enable). The back screen lights up within ≤50ms from T1 to T2, with a total delay of ≤100ms. At the same time, a 15-second timer is started, and the back screen is turned off when the time is up.

[0037] Example 2: Display control. Specific display control of the digital back screen is achieved by writing to specific file nodes. The control logic is shown in Figure 4. Precise display control is achieved by reading and writing different file nodes under the path sys / class / dlcd_node / . For example, writing a value of 1-160 to the dlcd_backlight node can adjust the brightness, and writing parameters such as battery and time to the dlcd_debug node can control the display and closing of the corresponding icons.

[0038] Example 3: Location and Temperature / Humidity Display For the "Location Data Adaptation" function, which requires network data, the processing flow is shown in Figure 5. The process begins at step 301, obtaining location information; step 302, parsing out latitude, longitude, and time zone; step 303, adjusting the time display according to the time zone; step 304, calling the weather API to obtain accurate temperature and humidity data based on latitude and longitude; and step 305, converting the unit according to user settings (Fahrenheit / Celsius) and displaying the data.

[0039] It should be understood that the above description is only a preferred embodiment of the present invention and is not sufficient to limit the technical solution of the present invention. For those skilled in the art, within the spirit and principles of the present invention, additions, subtractions, substitutions, transformations, or improvements can be made based on the above description. For example: 1) Replace the dot-matrix OLED digital screen with an E-Ink electronic ink screen to further reduce power consumption to ≤5mAh / day, and change the type of the back screen in the hardware to make it suitable for long standby models that are sensitive to power consumption; 2) Replace the CN91C4S48 with an ESP32-C3 chip, and add Wi-Fi communication function by changing the control chip in the hardware to support remote viewing of back screen data (such as via home Wi-Fi). 3) Add a "Message Notification Display" module to the independent control program, read the / sys / class / notification / data file node, and through functional expansion, display the number of SMS, WeChat and other messages on the back screen without turning on the main screen; 4) Add "Light Sensor Linkage" logic, read the / sys / class / sensor / light / data file node to obtain the ambient light intensity, and automatically adjust the back screen brightness (e.g., 80% in strong light and 20% in weak light), and further reduce power consumption through power optimization; 5) If the phone does not have a GPS / BeiDou module, it can read the / sys / class / net / wlan / ip_addr file node to obtain the IP address, and replace GPS positioning with IP positioning, and adapt to low-end models without positioning modules through positioning method expansion; and all the above-mentioned additions, subtractions, replacements, transformations or improvements of technical solutions should fall within the protection scope of the appended claims of this invention.

Claims

1. A method for displaying a digital back screen of a mobile phone based on independent control of file nodes, executed by an independent control program running in the mobile phone system, characterized in that, The method includes: obtaining the phone's status data and sensor data by reading the phone's system file nodes, wherein the status data includes battery power and the sensor data includes gravity sensor data; determining whether the phone meets preset screen-on conditions based on the sensor data; and when the screen-on conditions are met, having the independent control program directly write control instructions to the digital back screen's driver node to control the digital back screen to light up and display the status data.

2. The mobile phone digital back screen display method based on file node independent control according to claim 1, characterized in that, "Determining whether the mobile phone meets the preset screen-on conditions based on the sensor data" specifically includes: reading gravity sensor data and calculating the phone's flip angle; determining whether the flip angle is greater than or equal to 120 degrees and the phone's main screen is in a screen-off state; if so, it is determined that the screen-on conditions are met.

3. The mobile phone digital back screen display method based on file node independent control according to claim 1 or 2, characterized in that: After the timer reaches the preset duration, the digital back screen is turned off.

4. The mobile phone digital back screen display method based on file node independent control according to claim 1, characterized in that, "Obtaining mobile phone status data" also includes: obtaining current location information by calling the mobile phone system's location service; obtaining local temperature and humidity data by calling the weather application interface based on the current location information; and displaying the local temperature and humidity data on the digital back screen.

5. The mobile phone digital back screen display method based on file node independent control according to claim 4, characterized in that, The method further includes: receiving a display configuration instruction sent by a user through a separate configuration application; and adjusting the data content or display format displayed on the digital back screen according to the display configuration instruction.

6. A mobile phone digital back screen display system based on independent control of file nodes, characterized in that, The system includes a hardware architecture and software modules running on the mobile phone system: the hardware architecture includes a dot-matrix digital back screen (101), an independent control chip, and a power supply module (103) for powering the system. The independent control chip is connected to the mobile phone motherboard via a single-channel UART bus. The software modules include: a data reading module (201) for periodically reading the file nodes of the mobile phone system to obtain the mobile phone's status data and sensor data; a data processing module (202) for determining whether preset screen-on conditions are met based on the sensor data; and a display control module (203) for directly writing control instructions to the driver node of the digital back screen to control its display when the screen-on conditions are met.

7. The mobile phone digital back screen display system based on file node independent control according to claim 6, characterized in that, The software module also includes: a power consumption control module (204) for timed off and brightness adjustment of the digital back screen; a user configuration module (205) for receiving and responding to user configuration commands through an independent application; and an exception handling module (206) for switching to local backup data when data reading fails.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the method as described in any one of claims 1 to 5.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the method as described in any one of claims 1 to 5.

Images