High-efficiency energy-saving LED screen display module based on voltage division power supply and frequency conversion refreshing

Abstract

The invention relates to the technical field of LED display screens, in particular to a high-efficiency energy-saving LED screen display module based on voltage division power supply and frequency conversion refreshing, which comprises an LED module, a power supply module and a frequency conversion refreshing module, the dynamic frequency conversion control module comprises a self-adaptive frame rate adjusting system and a double-closed-loop feedback system; and the dynamic environment illuminance adjusting module is used for adjusting the brightness of the LED display screen by adopting a dynamic adjusting algorithm according to the illumination intensity. According to the high-efficiency and energy-saving LED screen display module based on voltage division power supply and frequency conversion refreshing, a three-level energy-saving system is constructed through a three-color independent voltage division power supply framework, a dynamic frame rate adjusting algorithm based on gray analysis and an environment illuminance dynamic adjusting technology, the energy-saving rate is increased by more than 40%, and the energy-saving effect is improved by more than 40%. Unification of energy saving and high display performance is realized through a differential voltage division scheme and dynamic frame rate adjustment.

Description

Technical Field

[0001] The present invention relates to the technical field of LED display screens, and in particular to a high-efficiency and energy-saving LED screen display module based on voltage-dividing power supply and variable-frequency refreshing. Background Art

[0002] Traditional LED display screen modules usually use a unified power supply voltage, which does not fully consider the differences in the volt-ampere characteristics of RGB LEDs, resulting in energy waste. At the same time, a fixed refresh rate makes it difficult to balance display effects and energy consumption in different display scenarios. Traditional LED display screen modules have two major energy efficiency bottlenecks: First, the energy waste caused by unified power supply: the volt-ampere characteristics of RGBLEDs vary significantly (the forward voltage of red light is 2.1-2.5V, and the blue / green light is 3.1-3.5V). When the traditional 5V unified power supply is used, the red light LED voltage redundancy loss reaches 54% (5V-2.3V); second, the scene mismatch of the fixed refresh rate: the 60Hz refresh rate has more than 70% invalid refresh cycles in low-brightness text scenes, resulting in dynamic power consumption redundancy, so this needs to be improved. Summary of the Invention

[0003] The purpose of the present invention is to provide a high-efficiency and energy-saving LED screen display module based on voltage-dividing power supply and variable frequency refresh, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above objectives, the present invention provides the following technical solutions: a high-efficiency and energy-saving LED screen display module based on voltage-dividing power supply and variable frequency refresh, the module comprising:

[0005] An LED module, wherein the LED module includes three-color independent voltage-dividing circuits;

[0006] A dynamic frequency conversion control module, comprising an adaptive frame rate adjustment system and a dual closed-loop feedback system;

[0007] The ambient light dynamic adjustment module is used to adjust the brightness of the LED display screen according to the light intensity and using a dynamic adjustment algorithm.

[0008] Preferably, the three-color independent voltage-dividing circuit includes:

[0009] Red LED 1 uses an independent low-voltage power supply of 2.1-2.5V to match its theoretical on-voltage of 2.0V;

[0010] Blue LED 2, powered by 3.1-3.5V medium voltage;

[0011] Green LED 3 is powered by a 3.1-3.5V medium voltage.

[0012] Preferably, the cathodes of the three-color LEDs in the three-color independent voltage-dividing circuit are uniformly connected to a common ground, and low-impedance copper foil wiring is used to reduce ground loop interference and ensure signal integrity.

[0013] Preferably, the hardware architecture of the adaptive frame rate adjustment system includes:

[0014] The control card has a built-in grayscale histogram statistics module, which completes the grayscale distribution analysis of 16384 pixels per frame;

[0015] The PWM frequency register is used to dynamically configure the constant current driver chip through the SPI bus and supports five-speed adjustment from 120Hz to 2000Hz.

[0016] Preferably, the dual closed-loop feedback system is used to perform:

[0017] Current sampling: A precision resistor is connected in series to the cathode of the LED. The voltage signal is filtered by RC and then sampled by a high-precision ADC with a resolution of 0.1mA.

[0018] Digital PID control: According to the deviation between the sampled current and the set value, the drive current is adjusted in real time through the digital PID algorithm to ensure current accuracy;

[0019] Temperature compensation: The NTC thermistor monitors the junction temperature in real time and automatically reduces the current when it exceeds 85°C. The formula is:

[0020]

[0021] Among them, I new is the adjusted current, I old is the original current, and T is the real-time temperature.

[0022] Preferably, the ambient light dynamic adjustment module uses a high-precision light sensor to monitor the ambient light intensity in real time, with a measurement range of 1-65535lx. The light sensor is connected to the control card via an I2C bus and transmits light intensity data in real time at a clock frequency of 100kHz.

[0023] The control logic of the dynamic algorithm includes:

[0024] The brightness of the LED display is dynamically adjusted according to the ambient light intensity. When the ambient light intensity is lower than 100lx, the brightness of the display is adjusted to 10%; when the ambient light intensity is between 100-1000lx, the brightness is linearly adjusted to 30%-70%. When the outdoor light intensity is less than 1000lux on a cloudy day, the brightness is adjusted to 50%-70%; when the ambient light intensity is higher than 1000ux-10000lux, the brightness is adjusted to 70%-100%. The algorithm formula is:

[0025]

[0026] The refresh rate is dynamically adjusted based on grayscale analysis and ambient light intensity. In low-light environments, the refresh rate is prioritized to be reduced to save energy, while the refresh rate is adjusted to 120Hz-600Hz based on the grayscale distribution. In high-light environments, the refresh rate is adjusted to 600Hz-7680Hz based on the grayscale distribution to ensure the display effect.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention proposes a high-efficiency and energy-saving LED screen display module based on voltage-dividing power supply and variable frequency refresh. Through a three-color independent voltage-dividing power supply architecture, a dynamic frame rate adjustment algorithm based on grayscale analysis, and a dynamic adjustment technology for ambient light illumination, a three-level energy-saving system is constructed to achieve an energy saving rate increase of more than 40%. Through differentiated voltage-dividing schemes and dynamic frame rate adjustment, the unity of energy saving and high display performance is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural diagram of the three-color independent voltage divider circuit of the present invention. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] See also Figure 1 The present invention provides a technical solution: a high-efficiency and energy-saving LED screen display module based on voltage-dividing power supply and variable frequency refresh, the module includes:

[0032] An LED module, wherein the LED module includes three-color independent voltage-dividing circuits;

[0033] A dynamic frequency conversion control module, comprising an adaptive frame rate adjustment system and a dual closed-loop feedback system;

[0034] The ambient light dynamic adjustment module is used to adjust the brightness of the LED display screen according to the light intensity and using a dynamic adjustment algorithm.

[0035] The three-color independent voltage division circuit includes:

[0036] Red LED 1 uses an independent low-voltage power supply of 2.1-2.5V to match its theoretical on-voltage of 2.0V;

[0037] Blue LED 2, powered by 3.1-3.5V medium voltage;

[0038] The green LED 3 uses a 3.1-3.5V medium voltage power supply. The power consumption of a single red LED is reduced from 1.35W in the traditional solution to 0.23W, with an energy saving rate of 83%. The blue and green LEDs also reduce voltage redundancy losses.

[0039] The cathodes of the three LEDs in the three-color independent voltage-dividing circuit are connected to a common ground (GND) with a common ground impedance of less than 50mΩ. Low-impedance copper foil routing reduces ground loop interference and ensures signal integrity. Red LED 1 is powered at a low voltage, reducing the voltage drop across its series resistor (ΔV = I × R), reducing power consumption by approximately 30%. Blue and green LEDs 2 and 3 are powered at a medium voltage to match their volt-ampere characteristics, avoiding the overheating of the linear regulator caused by excessive voltage in traditional solutions.

[0040] The hardware architecture of the adaptive frame rate adjustment system includes:

[0041] The control card has a built-in grayscale histogram statistics module, which completes the grayscale distribution analysis of 16384 pixels per frame (16.67ms);

[0042] The PWM frequency register is used to dynamically configure the constant current driver chip through the SPI bus (10MHz clock) and supports five-speed adjustment from 120Hz to 2000Hz.

[0043] The dual closed-loop feedback system is used to:

[0044] Current sampling: A precision resistor (Rcs) is connected in series with the LED cathode. The voltage signal is filtered by RC (100Ω + 10nF) and then sampled by a high-precision ADC with a resolution of 0.1mA.

[0045] Digital PID control: According to the deviation between the sampled current and the set value, the drive current is adjusted in real time through the digital PID algorithm to ensure current accuracy;

[0046] Temperature compensation: The NTC thermistor monitors the junction temperature in real time and automatically reduces the current when it exceeds 85°C. The formula is:

[0047]

[0048] Among them, I new is the adjusted current, I old is the original current, and T is the real-time temperature.

[0049] The ambient light dynamic adjustment module uses a high-precision light sensor (such as BH1750) to monitor the ambient light intensity in real time. The measurement range is 1-65535lx. The light sensor is connected to the control card through the I2C bus and transmits light intensity data in real time at a clock frequency of 100kHz.

[0050] The control logic of the dynamic algorithm includes:

[0051] The brightness of the LED display is dynamically adjusted according to the ambient light intensity. When the ambient light intensity is lower than 100lx, the brightness of the display is adjusted to 10%; when the ambient light intensity is between 100-1000lx, the brightness is linearly adjusted to 30%-70%. When the outdoor light intensity is less than 1000lux on a cloudy day, the brightness is adjusted to 50%-70%; when the ambient light intensity is higher than 1000ux-10000lux, the brightness is adjusted to 70%-100%. The algorithm formula is:

[0052]

[0053] The refresh rate is dynamically adjusted based on grayscale analysis and ambient light intensity. In low-light environments, the refresh rate is prioritized to be reduced to save energy, while the refresh rate is adjusted to 120Hz-600Hz based on the grayscale distribution. In high-light environments, the refresh rate is adjusted to 600Hz-7680Hz based on the grayscale distribution to ensure the display effect.

[0054] The present invention constructs a three-level energy-saving system (power distribution → scanning control → power consumption management) through a three-color independent voltage-sharing power supply architecture, a dynamic frame rate adjustment algorithm based on grayscale analysis, and a dynamic adjustment technology for ambient light illumination, achieving an energy saving rate increase of more than 40%. Through differentiated voltage-sharing schemes and dynamic frame rate adjustment, the unity of energy saving and high display performance is achieved.

[0055] The overall power consumption of the present invention is 42% lower than that of traditional modules, and the energy-saving advantage is increased to 55% when adapted to a dual power supply system. The display performance supports a 2000Hz refresh rate and 16-bit grayscale, and the EMI noise is less than 40dBμV, meeting the needs of high-end commercial displays. The over-temperature current reduction (0.3% / ℃) and ESD protection (±8kV) design extend the module life to 100,000 hours. For the first time, the LED wavelength-voltage characteristics are combined with dynamic frame rate adjustment to build a three-level energy-saving system across the physical layer and algorithm layer. And through the signal interlocking of high-performance control cards, logic chips, NMOS row driver tubes, and constant current driver chips, a millisecond-level linkage response of "data statistics-frame rate adjustment-current control" is achieved.

[0056] This invention achieves a breakthrough balance between energy saving and display performance through chip-level collaborative design and system-level energy efficiency optimization. Its innovative architecture based on physical models can be widely adapted to multiple scenarios such as indoor, outdoor, and small-pitch, and has significant technical barriers and market application value.

[0057] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency and energy-saving LED screen display module based on voltage-dividing power supply and variable frequency refresh, characterized by: This module includes: An LED module, wherein the LED module includes three-color independent voltage-dividing circuits; A dynamic frequency conversion control module, comprising an adaptive frame rate adjustment system and a dual closed-loop feedback system; The ambient light dynamic adjustment module is used to adjust the brightness of the LED display screen according to the light intensity and using a dynamic adjustment algorithm.

2. The high-efficiency energy-saving LED screen display module based on voltage-dividing power supply and frequency-converting refresh according to claim 1 is characterized in that: The three-color independent voltage-dividing circuit includes: Red LED 1 uses an independent low-voltage power supply of 2.1-2.5V to match its theoretical on-voltage of 2.0V; Blue LED 2, powered by 3.1-3.5V medium voltage; Green LED 3 is powered by a 3.1-3.5V medium voltage.

3. The high-efficiency energy-saving LED screen display module based on voltage-dividing power supply and frequency-converting refresh according to claim 1, characterized in that: The cathodes of the three-color LEDs in the three-color independent voltage-dividing circuit are uniformly connected to a common ground, and low-impedance copper foil wiring is used to reduce ground loop interference and ensure signal integrity.

4. The high-efficiency energy-saving LED screen display module based on voltage-dividing power supply and frequency-converting refresh according to claim 1 is characterized in that: The hardware architecture of the adaptive frame rate adjustment system includes: The control card has a built-in grayscale histogram statistics module, which completes the grayscale distribution analysis of 16384 pixels per frame; The PWM frequency register is used to dynamically configure the constant current driver chip through the SPI bus and supports five-speed adjustment from 120Hz to 2000Hz.

5. The high-efficiency energy-saving LED screen display module based on voltage-dividing power supply and frequency-converting refresh according to claim 1 is characterized in that: The dual closed-loop feedback system is used to: Current sampling: A precision resistor is connected in series to the cathode of the LED. The voltage signal is filtered by RC and then sampled by a high-precision ADC with a resolution of 0.1mA. Digital PID control: According to the deviation between the sampled current and the set value, the drive current is adjusted in real time through the digital PID algorithm to ensure current accuracy; Temperature compensation: The NTC thermistor monitors the junction temperature in real time and automatically reduces the current when it exceeds 85°C. The formula is: Among them, I new is the adjusted current, I old is the original current, and T is the real-time temperature.

6. The high-efficiency energy-saving LED screen display module based on voltage-dividing power supply and frequency-converting refresh according to claim 1, characterized in that: The ambient light dynamic adjustment module uses a high-precision light sensor to monitor the ambient light intensity in real time. The measurement range is 1-65535lx. The light sensor is connected to the control card via the I2C bus and transmits light intensity data in real time at a clock frequency of 100kHz. The control logic of the dynamic algorithm includes: Dynamically adjust the brightness of the LED display according to the ambient light intensity. When the ambient light intensity is lower than 100lx, the display brightness is adjusted to 10%; When the ambient light intensity is between 100-1000lx, the brightness is linearly adjusted to 30%-70%. When the outdoor light intensity is less than 1000lux on a cloudy day, the brightness is adjusted to 50%-70%. When the ambient light intensity is higher than 1000lux-10000lux, the brightness is adjusted by 70%-100%. The algorithm formula is: The refresh rate is dynamically adjusted based on grayscale analysis and ambient light intensity. In low-light environments, the refresh rate is prioritized to be reduced to save energy, while the refresh rate is adjusted to 120Hz-600Hz based on the grayscale distribution. In high-light environments, the refresh rate is adjusted to 600Hz-7680Hz based on the grayscale distribution to ensure the display effect.

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