LCD display screen power supply signal control method and system

Abstract

According to the LCD display screen power supply signal control method and system, by accurately managing voltage output and time sequence adjustment when the display screen is started, image display stability is ensured, flicker and image distortion are avoided, voltage output is dynamically adjusted according to changes of display content and external environment parameters, and energy conservation and consumption reduction are achieved.

Description

Technical Field

[0001] The present invention relates to the field of automatic control technology, and in particular to a method and system for controlling power supply signals of an LCD display screen. Background Art

[0002] In modern electronic devices, LCDs are widely used in various devices, such as televisions, computer monitors, smart phones, etc. However, the existing technology has defects in the control of power signals for LCD displays. Unstable power signals can cause flickering, image distortion or interference on the LCD display. At the same time, due to the lack of proper timing control, the voltage sources may start at the same time or in an incorrect order, which can also cause flickering, temporary distortion or complete inability to display images on the display. Summary of the invention

[0003] Based on the defects of the prior art in controlling the power signal of an LCD display screen, the present invention proposes a method and system for controlling the power signal of an LCD display screen, and the technical scheme adopted is as follows: A method for controlling a power signal of an LCD display screen, the method comprising: S1: obtaining standard values ​​of operating parameters of the LCD display screen, and adjusting output voltages of various voltage sources based on the standard values ​​of the operating parameters of the LCD display screen through a power management circuit so that the LCD display screen starts normally, wherein the output voltages of various voltage sources include logic voltage, backlight voltage and bias voltage; S2: Setting a timing signal generation program, wherein the timing signal is used to control the start-up sequence of each voltage source, and adjusting the phase and frequency of the timing signal so that the timing signal matches the driving requirements of the LCD display; S3: Configure the threshold parameters of the protection circuit. When the voltage or current exceeds the threshold, the protection circuit starts, cuts off the power supply, and issues an early warning. S4: collecting display parameters of the LCD display screen and external environmental parameters, and dynamically adjusting the output voltage of the voltage source according to the display parameters and external environmental parameters.

[0004] Preferably, the working parameters of S1 include brightness, contrast, resolution and refresh rate.

[0005] Preferably, S2 includes: S21: Obtaining the driving requirements of the LCD display screen, and setting the start-up sequence of each voltage source according to the driving requirements of the LCD display screen, wherein the driving requirements include pixel refresh timing and driving frequency; S22: adjusting the phase of the timing signal so that the phase of the timing signal matches the pixel refresh timing of the LCD display, and adjusting the frequency of the timing signal so that the frequency of the timing signal matches the driving frequency of the LCD display.

[0006] Preferably, the startup sequence of S2 includes: After the phase and frequency of the timing signal successfully match the driving requirements of the display screen, the timing signal generation program of the present invention calculates the time interval for starting each voltage source, including obtaining the maximum voltage fluctuation range of the power supply of the LCD display screen, obtaining the rated current of the power supply of the LCD display screen and the maximum current fluctuation range, and the time interval is obtained by the following formula: ; Where C represents the equivalent capacitance of the power supply of the LCD display. Indicates the maximum voltage fluctuation range of the LCD display power supply. Indicates the maximum current that the power supply of the LCD display can withstand, I represents the rated current, and T represents the ambient temperature factor, that is, the impact of the environment on the startup interval time, and is normalized. The value range of T is (0,1). It represents the time taken for the LCD display to receive the output voltage of the voltage source until the voltage stabilizes, and the Obtained through the following formula: ; Wherein, B represents the bandwidth of the LCD display power supply, R represents the equivalent resistance of the LCD display power supply, θ represents the phase of the timing signal, And according to the calculated time interval for starting each voltage source, each voltage source is started respectively.

[0007] Preferably, S3 includes: S31: obtaining the rated voltage of the power supply of the LCD display screen, and setting the voltage threshold value according to the rated voltage and the maximum voltage fluctuation range; similarly, obtaining the rated current and the maximum current fluctuation range of the power supply of the LCD display screen, and setting the current threshold value according to the rated current and the maximum current fluctuation range; S32: The voltage sensor and the current sensor in the LCD display screen detect the actual voltage and the actual current in the LCD display screen in real time. If the actual voltage exceeds the voltage threshold, a high level signal is output; if the actual current exceeds the current threshold, a high level signal is output; S33: The protection circuit receives level signals from the voltage sensor and the current sensor. If any one of the signals is a high level signal, the circuit breaker in the protection circuit cuts off the power supply.

[0008] Preferably, the S4 includes: S41: analyzing the image content, and dividing the image into a static image and a dynamic image according to the analysis result; S42: If the image content is static, the output voltage adjustment system of the LCD display power supply reduces the voltage values ​​of the high voltage and the low voltage. If the image content is dynamic, the output voltage adjustment system of the LCD display power supply increases the voltage values ​​of the high voltage and the low voltage.

[0009] A LCD display screen power signal control system, the system comprising: Output voltage setting system: obtaining standard values ​​of operating parameters of the LCD display screen, and adjusting the output voltages of various voltage sources based on the standard values ​​of the operating parameters of the LCD display screen through the power management circuit, so that the LCD display screen can start normally, wherein the output voltages of various voltage sources include logic voltage, backlight voltage and bias voltage; Timing signal setting system: setting the timing signal generation program, the timing signal is used to control the start-up sequence of each voltage source, and adjust the phase and frequency of the timing signal to match the driving requirements of the LCD display; Circuit protection system: configure the threshold parameters of the protection circuit. When the voltage or current exceeds the threshold, the protection circuit starts, cuts off the power supply, and issues an early warning; Voltage balancing system: collects display parameters of the LCD display screen and external environmental parameters, and dynamically adjusts the output voltage of the voltage source according to the display parameters and external environmental parameters.

[0010] Preferably, the timing signal setting system comprises: Startup sequence setting system: obtains the driving requirements of the LCD display screen, and sets the startup sequence of each voltage source according to the driving requirements of the LCD display screen, wherein the driving requirements include pixel refresh timing and driving frequency; Matching system: adjust the phase of the timing signal to match the pixel refresh timing of the LCD display, and adjust the frequency of the timing signal to match the driving frequency of the LCD display.

[0011] Preferably, the circuit protection system comprises: Threshold setting system: obtain the rated voltage of the power supply of the LCD display screen, and set the voltage threshold according to the rated voltage and the maximum voltage fluctuation range. Similarly, obtain the rated current and the maximum current fluctuation range of the power supply of the LCD display screen, and set the current threshold according to the rated current and the maximum current fluctuation range. Signal output system: The voltage sensor and current sensor in the LCD display screen detect the actual voltage and actual current in the LCD display screen in real time. If the actual voltage exceeds the voltage threshold, a high-level signal is output; if the actual current exceeds the current threshold, a high-level signal is output; Circuit breaker system: The protection circuit receives level signals from the voltage sensor and the current sensor. If any of the signals is a high level signal, the circuit breaker in the protection circuit cuts off the power supply.

[0012] Preferably, the voltage balancing system comprises: Image analysis system: analyzes the image content and divides the image into static images and dynamic images according to the analysis results; Output voltage adjustment system: If the image content is static, the output voltage adjustment system of the LCD display power supply reduces the voltage values ​​of the high voltage and the low voltage. If the image content is dynamic, the output voltage adjustment system of the LCD display power supply increases the voltage values ​​of the high voltage and the low voltage.

[0013] Beneficial effects of the present invention: The present invention ensures the stability of image display and avoids flickering and image distortion by accurately managing the voltage output and timing adjustment when the display screen is started. According to the changes in display content and external environmental parameters, the voltage output is dynamically adjusted to achieve energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The present invention provides a method for controlling a power signal of an LCD display screen. DETAILED DESCRIPTION

[0015] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0016] One embodiment of the present invention provides a method for controlling a power signal of an LCD display screen, the method comprising: S1: obtaining standard values ​​of operating parameters of the LCD display screen, and adjusting output voltages of various voltage sources based on the standard values ​​of the operating parameters of the LCD display screen through a power management circuit so that the LCD display screen starts normally, wherein the output voltages of various voltage sources include logic voltage, backlight voltage and bias voltage; S2: Setting a timing signal generation program, wherein the timing signal is used to control the start-up sequence of each voltage source, and adjusting the phase and frequency of the timing signal so that the timing signal matches the driving requirements of the LCD display; S3: Configure the threshold parameters of the protection circuit. When the voltage or current exceeds the threshold, the protection circuit starts, cuts off the power supply, and issues an early warning. S4: collecting display parameters of the LCD display screen and external environmental parameters, and dynamically adjusting the output voltage of the voltage source according to the display parameters and external environmental parameters.

[0017] The working principle and effect of the above technical solution are as follows: First, the system obtains the standard operating parameters required by the LCD display, including brightness, contrast, resolution and refresh rate. Based on the parameters, the output of each voltage source is adjusted through the power management circuit to ensure that the display can start and work in the best state. Including logic voltage (control signal processing), backlight voltage (affecting screen brightness) and bias voltage (maintaining stable display). Set the timing signal generation program to accurately manage the startup sequence of each voltage source, ensure that the display screen components are started in the correct order and time, and adjust the phase and frequency of the timing signal to ensure that it matches the refresh and scanning requirements of the display screen to avoid display anomalies and image distortion. Configure the threshold parameters of the protection circuit according to the rated voltage and current of the display screen. When it is detected that the voltage or current exceeds the set safety threshold, the protection circuit immediately cuts off the power supply to avoid damage to the display screen and other components. At the same time, an early warning signal is issued to remind the user or system to check. Real-time acquisition of the display parameters of the LCD display screen and external environmental parameters, according to these real-time data, dynamically adjust the output of the voltage source. To adapt to changing working conditions and environment, to ensure the best display effect and energy consumption management. Since the power output can be adjusted at any time according to actual needs, unnecessary power consumption can be reduced, thereby improving the energy efficiency of the device, while reducing the loss of display components caused by long-term heat accumulation and extending the service life of the device.

[0018] In one embodiment of the present invention, S2 includes: S21: Obtaining the driving requirements of the LCD display screen, and setting the start-up sequence of each voltage source according to the driving requirements of the LCD display screen, wherein the driving requirements include pixel refresh timing and driving frequency; S22: adjusting the phase of the timing signal so that the phase of the timing signal matches the pixel refresh timing of the LCD display, and adjusting the frequency of the timing signal so that the frequency of the timing signal matches the driving frequency of the LCD display.

[0019] The working principle and effect of the above technical solution are as follows: determine the technical specifications of the display screen, including the pixel refresh timing and the display drive frequency, and design the startup sequence of each voltage source according to the obtained drive requirements. Ensure that the phase of the timing signal matches the pixel refresh timing to avoid lag or misalignment between pixel data transmission and actual display. Adjust the frequency of the timing signal according to the display drive frequency to meet the requirements of the number of refresh frames per second. Through the coordination of the above two steps, the power management system can be dynamically adjusted to ensure that each part of the display screen receives the appropriate signal voltage and frequency at the right time. This allows the display to not only operate with high efficiency, but also minimize electrical interference and electromagnetic compatibility issues, thereby improving the stability and performance of the overall system.

[0020] In one embodiment of the present invention, the startup sequence of S2 includes: After the phase and frequency of the timing signal successfully match the driving requirements of the display screen, the timing signal generation program of the present invention calculates the time interval for starting each voltage source, including obtaining the maximum voltage fluctuation range of the power supply of the LCD display screen, obtaining the rated current of the power supply of the LCD display screen and the maximum current fluctuation range, and the time interval is obtained by the following formula: ; Where C represents the equivalent capacitance of the power supply of the LCD display. Indicates the maximum voltage fluctuation range of the LCD display power supply. Indicates the maximum current that the power supply of the LCD display can withstand, I represents the rated current, and T represents the ambient temperature factor, that is, the impact of the environment on the startup interval time, and is normalized. The value range of T is (0,1). It represents the time taken for the LCD display to receive the output voltage of the voltage source until the voltage stabilizes, and the Obtained through the following formula: ; Wherein, B represents the bandwidth of the LCD display power supply, R represents the equivalent resistance of the LCD display power supply, θ represents the phase of the timing signal, And according to the calculated time interval for starting each voltage source, each voltage source is started respectively.

[0021] The working principle and effect of the above technical solution are: The charging and discharging process of capacitor C and the influence of current change on system response are considered. Capacitors play the role of storing and releasing charges in the circuit. When the voltage changes, the capacitors will undergo the charging and discharging process, resulting in a delay in the system response. In addition, the change of current will also affect the response speed of the system, especially when the current changes from the rated value to the maximum value, the response of the system will be affected. At the same time, the change of ambient temperature T will affect the performance of electronic components and the stability of the system. By calculating the startup time interval of the voltage source, it can be ensured that each voltage source is started at the most appropriate time. This can prevent circuit abnormalities and display distortion caused by voltage or current being too early or too late. By considering the maximum voltage fluctuation range and current conditions, the supply of current and voltage is more stable, making the LCD display more reliable during startup and operation. Accurate time intervals can avoid current mutations and electrical shocks caused by the simultaneous startup of multiple voltage sources, which is conducive to protecting the integrity of circuits and components.

[0022] In one embodiment of the present invention, S3 includes: S31: obtaining the rated voltage of the power supply of the LCD display screen, and setting the voltage threshold value according to the rated voltage and the maximum voltage fluctuation range; similarly, obtaining the rated current and the maximum current fluctuation range of the power supply of the LCD display screen, and setting the current threshold value according to the rated current and the maximum current fluctuation range; S32: The voltage sensor and the current sensor in the LCD display screen detect the actual voltage and the actual current in the LCD display screen in real time. If the actual voltage exceeds the voltage threshold, a high level signal is output; if the actual current exceeds the current threshold, a high level signal is output; S33: The protection circuit receives level signals from the voltage sensor and the current sensor. If any one of the signals is a high level signal, the circuit breaker in the protection circuit cuts off the power supply.

[0023] The working principle and effect of the above technical solution are as follows: First, the threshold setting system obtains the rated voltage and rated current of the LCD display power supply. Based on the obtained rated value and fluctuation range, the safety threshold of the voltage and current is set. The setting of the safety threshold is based on "rated voltage + maximum fluctuation range", and the same is true for the current; in the circuit of the LCD display, a voltage sensor and a current sensor are installed to monitor the actual voltage and current in the circuit in real time. The signal output system continuously compares the monitored voltage and current with the preset threshold. If the measured actual voltage exceeds the set voltage threshold, the voltage sensor will output a high-level signal. Similarly, if the actual current exceeds the current threshold, the current sensor will output a high-level signal. The protection circuit continuously monitors the high-level signal input from the voltage and current sensors. If any sensor outputs a high-level signal, it indicates that a certain electrical parameter has exceeded the safety range, and the circuit breaker in the protection circuit is immediately triggered to cut off the power supply. By setting the voltage and current thresholds, it is ensured that the LCD display operates within the safe operating range. When the electrical parameters exceed the safety range, the rapid protection mechanism can respond in time to avoid damage to the equipment. The protection circuit immediately cuts off the power supply when the voltage or current exceeds the threshold, reducing the risk of long-term cumulative thermal damage and rapid aging of components caused by overvoltage or overcurrent. It reduces the possibility of component fatigue and failure caused by overcurrent and overvoltage, making the LCD display and its power supply more durable. Set up an alert system to notify the user when the protection mechanism is triggered, thereby reducing unpredictable device behavior.

[0024] In one embodiment of the present invention, the S4 includes: S41: analyzing the image content, and dividing the image into a static image and a dynamic image according to the analysis result; S42: If the image content is static, the output voltage adjustment system of the LCD display power supply reduces the voltage values ​​of the high voltage and the low voltage. If the image content is dynamic, the output voltage adjustment system of the LCD display power supply increases the voltage values ​​of the high voltage and the low voltage.

[0025] However, if the LCD display power supply is in a high-high voltage or high-low voltage state for a long time, it will cause the temperature of the LCD display to rise. At the same time, a long time in a high voltage state will also cause excessive deflection or damage of the liquid crystal molecules, ultimately leading to image quality problems such as image retention, contrast reduction or color distortion. Therefore, while dissipating the heat of the LCD display power supply, the output voltage adjustment system performs more optimized processing of dynamic images, and the technical solutions adopted are as follows: A: further analyzing the dynamic image, calculating the difference between the current frame and the previous frame, and comparing the calculation result with a preset threshold. If the calculation result exceeds the threshold, the dynamic image is a fast-changing image; if the calculation result does not exceed the threshold, the dynamic image is a normal dynamic image. B: Get the current temperature of the LCD display power supply; C: When the dynamic image is a fast-changing image, If the temperature is lower than the maximum temperature that the LCD display power supply can withstand, the output voltage adjustment system will increase the high and low voltages to improve the responsiveness and clarity of the picture. If the temperature is close to the maximum temperature that the LCD display power supply can withstand, the output voltage adjustment system does not change the high voltage and low voltage, and the cooling system starts at the same time; When the dynamic image is a normal dynamic image, If the temperature is lower than the maximum temperature that the LCD display power supply can withstand, the output voltage adjustment system does not change the high voltage and low voltage; If the temperature is close to the maximum temperature that the LCD display power supply can withstand, the output voltage adjustment system reduces the high voltage and low voltage, and reduces the refresh rate of non-critical frames to avoid overheating; D: Regularly perform frame difference calculation and temperature monitoring, and dynamically adjust voltage.

[0026] The working principle and effect of the above technical solution are as follows: the system first performs content analysis on the image to be displayed to determine whether the image is static or dynamic. A static image refers to a picture with only a small amount or no changes, including a text page or a static picture. A dynamic image refers to a picture with frequent changes in content, including video playback or animation. If the analysis result shows that the image is static, the power output voltage of the LCD display will be reduced. Since static pictures do not require frequent pixel updates, reducing the voltage can reduce power consumption, extend the service life of the display, and also reduce energy consumption. If the image content is dynamic, the system will increase the high voltage and low voltage of the power output. Dynamic pictures need to be updated quickly, and higher voltages can ensure display quality and response speed. For dynamic images, the current frame and the previous frame are captured, and the difference is calculated using an image processing algorithm. The calculation result is compared with a preset threshold to determine the change amplitude of the dynamic image. If the result exceeds the threshold, it is determined to be a rapidly changing image; if it does not exceed, it is considered to be an ordinary dynamic image. The current temperature of the LCD display power supply is obtained in real time through a built-in temperature sensor. Determine whether the temperature is close to or exceeds the safe operating range of the screen power supply. When processing fast-changing images, if the current temperature is lower than the maximum tolerable limit, adjust the output voltage to increase the high and low voltages to enhance the picture response speed and clarity. If the temperature is close to the maximum tolerance range of the power supply, maintain the voltage level unchanged and start the cooling system to avoid overheating. When processing ordinary dynamic images, when the temperature is normal, keep the voltage adjustment unchanged and maintain the standard display effect to save energy. When approaching the upper temperature limit, appropriately reduce the high and low voltages, and may reduce the refresh rate of non-key frames to reduce heat generation and power consumption. Regularly measure the inter-frame difference and temperature, and continuously adjust the power supply voltage through real-time data feedback. In fast-changing image scenes, increasing the voltage can improve the screen response speed and image clarity. Use temperature sensors to monitor the device temperature in real time to prevent damage to liquid crystal molecules and aging of components caused by excessively high temperatures. Through the timely activation of the cooling system, effectively manage heat to ensure long-term stable operation of the device. By controlling the voltage, prevent problems such as color distortion and image retention caused by long-term high voltage, and maintain better image consistency and contrast.

[0027] One embodiment of the present invention provides a LCD display screen power signal control system, the system comprising: Output voltage setting system: obtaining standard values ​​of operating parameters of the LCD display screen, and adjusting the output voltages of various voltage sources based on the standard values ​​of the operating parameters of the LCD display screen through the power management circuit, so that the LCD display screen can start normally, wherein the output voltages of various voltage sources include logic voltage, backlight voltage and bias voltage; Timing signal setting system: setting the timing signal generation program, the timing signal is used to control the start-up sequence of each voltage source, and adjust the phase and frequency of the timing signal to match the driving requirements of the LCD display; Circuit protection system: configure the threshold parameters of the protection circuit. When the voltage or current exceeds the threshold, the protection circuit starts, cuts off the power supply, and issues an early warning; Voltage balancing system: collects display parameters of the LCD display screen and external environmental parameters, and dynamically adjusts the output voltage of the voltage source according to the display parameters and external environmental parameters.

[0028] The working principle and effect of the above technical solution are as follows: First, the system obtains the standard operating parameters required for the LCD display screen, including brightness, contrast, resolution and refresh rate. Based on the parameters, the output of each voltage source is adjusted by the power management circuit to ensure that the display screen can start and work in the best state. Including logic voltage (control signal processing), backlight voltage (affecting screen brightness) and bias voltage (maintaining stable display). A timing signal generation program is set to accurately manage the startup sequence of each voltage source, ensure that the display screen components are started in the correct order and time, and ensure that the refresh and scanning requirements of the display screen are matched by adjusting the phase and frequency of the timing signal to avoid display anomalies and image distortion. According to the rated voltage and current of the display screen, the threshold parameters of the protection circuit are configured. When it is detected that the voltage or current exceeds the set safety threshold, the protection circuit immediately cuts off the power supply to avoid damage to the display screen and other components. At the same time, an early warning signal is issued to remind the user or system to check. The display parameters of the LCD display screen and the external environment parameters are collected in real time, and the output of the voltage source is dynamically adjusted according to these real-time data. To adapt to changing working conditions and environment, ensure the best display effect and energy consumption management. Since the power output can be adjusted at any time according to actual needs, unnecessary power consumption can be reduced, thereby improving the energy efficiency of the device, while reducing the loss of display components caused by long-term heat accumulation and extending the service life of the device.

[0029] In one embodiment of the present invention, the timing signal setting system comprises: Startup sequence setting system: obtains the driving requirements of the LCD display screen, and sets the startup sequence of each voltage source according to the driving requirements of the LCD display screen, wherein the driving requirements include pixel refresh timing and driving frequency; Matching system: adjust the phase of the timing signal to match the pixel refresh timing of the LCD display, and adjust the frequency of the timing signal to match the driving frequency of the LCD display.

[0030] The working principle and effect of the above technical solution are as follows: determine the technical specifications of the display screen, including the pixel refresh timing and the display drive frequency, and design the startup sequence of each voltage source according to the obtained drive requirements. Ensure that the phase of the timing signal matches the pixel refresh timing to avoid lag or misalignment between pixel data transmission and actual display. Adjust the frequency of the timing signal according to the display drive frequency to meet the requirements of the number of refresh frames per second. Through the coordination of the above two steps, the power management system can be dynamically adjusted to ensure that each part of the display screen receives the appropriate signal voltage and frequency at the right time. This allows the display to not only operate with high efficiency, but also minimize electrical interference and electromagnetic compatibility issues, thereby improving the stability and performance of the overall system.

[0031] In one embodiment of the present invention, the circuit protection system comprises: Threshold setting system: obtain the rated voltage of the power supply of the LCD display screen, and set the voltage threshold according to the rated voltage and the maximum voltage fluctuation range. Similarly, obtain the rated current and the maximum current fluctuation range of the power supply of the LCD display screen, and set the current threshold according to the rated current and the maximum current fluctuation range. Signal output system: The voltage sensor and current sensor in the LCD display screen detect the actual voltage and actual current in the LCD display screen in real time. If the actual voltage exceeds the voltage threshold, a high-level signal is output; if the actual current exceeds the current threshold, a high-level signal is output; Circuit breaker system: The protection circuit receives level signals from the voltage sensor and the current sensor. If any of the signals is a high level signal, the circuit breaker in the protection circuit cuts off the power supply.

[0032] The working principle and effect of the above technical solution are as follows: First, the threshold setting system obtains the rated voltage and rated current of the LCD display power supply. Based on the obtained rated value and fluctuation range, the safety threshold of the voltage and current is set. The setting of the safety threshold is based on "rated voltage + maximum fluctuation range", and the same is true for the current; in the circuit of the LCD display, a voltage sensor and a current sensor are installed to monitor the actual voltage and current in the circuit in real time. The signal output system continuously compares the monitored voltage and current with the preset threshold. If the measured actual voltage exceeds the set voltage threshold, the voltage sensor will output a high-level signal. Similarly, if the actual current exceeds the current threshold, the current sensor will output a high-level signal. The protection circuit continuously monitors the high-level signal input from the voltage and current sensors. If any sensor outputs a high-level signal, it indicates that a certain electrical parameter has exceeded the safety range, and the circuit breaker in the protection circuit is immediately triggered to cut off the power supply. By setting the voltage and current thresholds, it is ensured that the LCD display operates within the safe operating range. When the electrical parameters exceed the safety range, the rapid protection mechanism can respond in time to avoid damage to the equipment. The protection circuit immediately cuts off the power supply when the voltage or current exceeds the threshold, reducing the risk of long-term cumulative thermal damage and rapid aging of components caused by overvoltage or overcurrent. It reduces the possibility of component fatigue and failure caused by overcurrent and overvoltage, making the LCD display and its power supply more durable. Set up an alert system to notify the user when the protection mechanism is triggered, thereby reducing unpredictable device behavior.

[0033] In one embodiment of the present invention, the voltage balancing system comprises: Image analysis system: analyzes the image content and divides the image into static images and dynamic images according to the analysis results; Output voltage adjustment system: If the image content is static, the output voltage adjustment system of the LCD display power supply reduces the voltage values ​​of the high voltage and the low voltage. If the image content is dynamic, the output voltage adjustment system of the LCD display power supply increases the voltage values ​​of the high voltage and the low voltage.

[0034] The working principle and effect of the above technical solution are as follows: the system first performs content analysis on the image to be displayed to determine whether the image is static or dynamic. A static image refers to a picture with only a small amount or no changes, including a text page or a static picture. A dynamic image refers to a picture with frequent changes in content, including video playback or animation. If the analysis result shows that the image is static, the power output voltage of the LCD display will be reduced. Since static pictures do not require frequent pixel updates, reducing the voltage can reduce power consumption, extend the service life of the display, and also reduce energy consumption. If the image content is dynamic, the system will increase the high voltage and low voltage of the power output. Dynamic pictures need to be updated quickly, and higher voltages can ensure display quality and response speed. For dynamic images, the current frame and the previous frame are captured, and the difference is calculated using an image processing algorithm. The calculation result is compared with a preset threshold to determine the change amplitude of the dynamic image. If the result exceeds the threshold, it is determined to be a rapidly changing image; if it does not exceed, it is considered to be an ordinary dynamic image. The current temperature of the LCD display power supply is obtained in real time through a built-in temperature sensor. Determine whether the temperature is close to or exceeds the safe operating range of the screen power supply. When processing fast-changing images, if the current temperature is lower than the maximum tolerable limit, adjust the output voltage to increase the high and low voltages to enhance the picture response speed and clarity. If the temperature is close to the maximum tolerance range of the power supply, maintain the voltage level unchanged and start the cooling system to avoid overheating. When processing ordinary dynamic images, when the temperature is normal, keep the voltage adjustment unchanged and maintain the standard display effect to save energy. When approaching the upper temperature limit, appropriately reduce the high and low voltages, and may reduce the refresh rate of non-key frames to reduce heat generation and power consumption. Regularly measure the inter-frame difference and temperature, and continuously adjust the power supply voltage through real-time data feedback. In fast-changing image scenes, increasing the voltage can improve the screen response speed and image clarity. Use temperature sensors to monitor the device temperature in real time to prevent damage to liquid crystal molecules and aging of components caused by excessively high temperatures. Through the timely activation of the cooling system, effectively manage heat to ensure long-term stable operation of the device. By controlling the voltage, prevent problems such as color distortion and image retention caused by long-term high voltage, and maintain better image consistency and contrast.

[0035] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for controlling a power signal of an LCD display screen, characterized in that: The method comprises: S1: obtaining standard values ​​of operating parameters of the LCD display screen, and adjusting output voltages of various voltage sources based on the standard values ​​of the operating parameters of the LCD display screen through a power management circuit so that the LCD display screen starts normally, wherein the output voltages of various voltage sources include logic voltage, backlight voltage and bias voltage; S2: Setting a timing signal generation program, wherein the timing signal is used to control the start-up sequence of each voltage source, and adjusting the phase and frequency of the timing signal so that the timing signal matches the driving requirements of the LCD display; S3: Configure the threshold parameters of the protection circuit. When the voltage or current exceeds the threshold, the protection circuit starts, cuts off the power supply, and issues an early warning. S4: collecting display parameters of the LCD display screen and external environmental parameters, and dynamically adjusting the output voltage of the voltage source according to the display parameters and external environmental parameters.

2. The LCD display screen power signal control method according to claim 1, characterized in that: The working parameters of S1 include brightness, contrast, resolution and refresh rate.

3. The LCD display screen power signal control method according to claim 1, characterized in that: The S2 includes: S21: Obtaining the driving requirements of the LCD display screen, and setting the start-up sequence of each voltage source according to the driving requirements of the LCD display screen, wherein the driving requirements include pixel refresh timing and driving frequency; S22: adjusting the phase of the timing signal so that the phase of the timing signal matches the pixel refresh timing of the LCD display, and adjusting the frequency of the timing signal so that the frequency of the timing signal matches the driving frequency of the LCD display.

4. The LCD display screen power signal control method according to claim 3, characterized in that: The startup sequence of S2 includes: After the phase and frequency of the timing signal successfully match the driving requirements of the display screen, the timing signal generation program of the present invention calculates the time interval for starting each voltage source, including obtaining the maximum voltage fluctuation range of the power supply of the LCD display screen, obtaining the rated current of the power supply of the LCD display screen and the maximum current fluctuation range, and the time interval is obtained by the following formula: ； Where C represents the equivalent capacitance of the power supply of the LCD display. Indicates the maximum voltage fluctuation range of the LCD display power supply. Indicates the maximum current that the power supply of the LCD display can withstand, I represents the rated current, and T represents the ambient temperature factor, that is, the impact of the environment on the startup interval time, and is normalized. The value range of T is (0,1). It represents the time taken for the LCD display to receive the output voltage of the voltage source until the voltage stabilizes, and the Obtained through the following formula: ； Wherein, B represents the bandwidth of the LCD display power supply, R represents the equivalent resistance of the LCD display power supply, θ represents the phase of the timing signal, And according to the calculated time interval for starting each voltage source, each voltage source is started respectively.

5. The LCD display screen power signal control method according to claim 1, characterized in that: The S3 includes: S31: obtaining the rated voltage of the power supply of the LCD display screen, and setting the voltage threshold value according to the rated voltage and the maximum voltage fluctuation range; similarly, obtaining the rated current and the maximum current fluctuation range of the power supply of the LCD display screen, and setting the current threshold value according to the rated current and the maximum current fluctuation range; S32: The voltage sensor and the current sensor in the LCD display screen detect the actual voltage and the actual current in the LCD display screen in real time. If the actual voltage exceeds the voltage threshold, a high level signal is output; if the actual current exceeds the current threshold, a high level signal is output; S33: The protection circuit receives level signals from the voltage sensor and the current sensor. If any one of the signals is a high level signal, the circuit breaker in the protection circuit cuts off the power supply.

6. The LCD display screen power signal control method according to claim 1, characterized in that: The S4 includes: S41: analyzing the image content, and dividing the image into a static image and a dynamic image according to the analysis result; S42: If the image content is static, the output voltage adjustment system of the LCD display power supply reduces the voltage values ​​of the high voltage and the low voltage. If the image content is dynamic, the output voltage adjustment system of the LCD display power supply increases the voltage values ​​of the high voltage and the low voltage.

7. An LCD display screen power signal control system, characterized in that: The system comprises: Output voltage setting system: obtaining standard values ​​of operating parameters of the LCD display screen, and adjusting the output voltages of various voltage sources based on the standard values ​​of the operating parameters of the LCD display screen through the power management circuit, so that the LCD display screen can start normally, wherein the output voltages of various voltage sources include logic voltage, backlight voltage and bias voltage; Timing signal setting system: setting the timing signal generation program, the timing signal is used to control the start-up sequence of each voltage source, and adjust the phase and frequency of the timing signal to match the driving requirements of the LCD display; Circuit protection system: configure the threshold parameters of the protection circuit. When the voltage or current exceeds the threshold, the protection circuit starts, cuts off the power supply, and issues an early warning; Voltage balancing system: collects display parameters of the LCD display screen and external environmental parameters, and dynamically adjusts the output voltage of the voltage source according to the display parameters and external environmental parameters.

8. The LCD display screen power signal control system according to claim 7, characterized in that: The timing signal setting system comprises: Startup sequence setting system: obtains the driving requirements of the LCD display screen, and sets the startup sequence of each voltage source according to the driving requirements of the LCD display screen, wherein the driving requirements include pixel refresh timing and driving frequency; Matching system: adjust the phase of the timing signal to match the pixel refresh timing of the LCD display, and adjust the frequency of the timing signal to match the driving frequency of the LCD display.

9. The LCD display screen power signal control system according to claim 7, characterized in that: The circuit protection system comprises: Threshold setting system: obtain the rated voltage of the power supply of the LCD display screen, and set the voltage threshold according to the rated voltage and the maximum voltage fluctuation range. Similarly, obtain the rated current and the maximum current fluctuation range of the power supply of the LCD display screen, and set the current threshold according to the rated current and the maximum current fluctuation range. Signal output system: The voltage sensor and current sensor in the LCD display screen detect the actual voltage and actual current in the LCD display screen in real time. If the actual voltage exceeds the voltage threshold, a high-level signal is output; if the actual current exceeds the current threshold, a high-level signal is output; Circuit breaker system: The protection circuit receives level signals from the voltage sensor and the current sensor. If any of the signals is a high level signal, the circuit breaker in the protection circuit cuts off the power supply.

10. The LCD display screen power signal control system according to claim 7, characterized in that: The voltage balancing system comprises: Image analysis system: analyzes the image content and divides the image into static images and dynamic images according to the analysis results; Output voltage adjustment system: If the image content is static, the output voltage adjustment system of the LCD display power supply reduces the voltage values ​​of the high voltage and the low voltage. If the image content is dynamic, the output voltage adjustment system of the LCD display power supply increases the voltage values ​​of the high voltage and the low voltage.

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