Colored electronic paper energy-saving driving design method and system based on optimized square wave driving

Abstract

The invention relates to a color electronic paper energy-saving driving design method and system based on optimized square wave driving, and belongs to the technical field of electronic paper display. The method comprises the following steps: firstly, based on a displacement time relation model of charged particles in the color electronic paper microcapsule, determining an optimal driving voltage interval of the particles, and generating a square wave driving waveform library; secondly, the environment temperature is monitored in real time, and square wave driving waveform parameters are dynamically adjusted; thirdly, analyzing statistical characteristics of the input image, dividing content complexity and distributing driving voltage grades; and finally, identifying an image change area through a frame difference algorithm, and performing local refreshing or global refreshing to realize image display. According to the color electronic paper energy-saving driving design method and system based on optimized square wave driving, an efficient and cooperative temperature compensation mechanism and a dynamic voltage adjusting strategy are combined, the display quality is maintained, meanwhile, the driving energy consumption of the color electronic paper is effectively reduced, and it is ensured that the color electronic paper is kept effective and stable in various temperature environments.

Description

Technical Field

[0001] The present invention belongs to the technical field of electronic paper display, and in particular relates to a method and system for designing energy-saving driving of color electronic paper based on optimized square wave driving. Background Art

[0002] With the rapid development of information technology, electronic reading has become a major trend. Electronic paper, a new type of display device, is widely used in IoT terminals, wearable devices, and electronic price tags. Its performance not only impacts the user experience but also directly affects the energy efficiency of the entire system. Traditional electronic paper uses the principle of electrophoresis to control the movement of black and white pigment particles within charged microcapsules to create image content. Color electronic paper achieves color display by adding color filters or using different colored electronic inks. However, existing color electronic paper faces significant driving challenges: it requires more complex waveforms, higher voltage levels, and longer refresh delays to complete image updates. These factors combine to result in significantly higher energy consumption than monochrome electronic paper, severely limiting its wider application. Therefore, optimizing the drive design of color electronic paper to reduce energy consumption is crucial for overcoming application bottlenecks and expanding its scope. The driving energy consumption of color electronic paper primarily comes from three components: static power consumption of the driver circuit, charge and discharge power consumption, and microcapsule displacement power consumption. Traditional driving schemes typically use complex multi-phase waveforms. While achieving excellent display effects, they also suffer from low energy efficiency. To maintain display quality, traditional drive schemes often require increased voltage and extended refresh times, especially under large temperature fluctuations. This further exacerbates energy consumption. To address these issues, this design proposes an energy-efficient drive design method and system for color e-paper based on optimized square-wave drive. This solution combines a highly efficient and coordinated temperature compensation mechanism with a dynamic voltage adjustment strategy to effectively reduce color e-paper drive energy consumption while maintaining display quality and ensuring effective stability across a wide range of temperature environments. Summary of the Invention

[0003] The purpose of the present invention is to provide an energy-saving drive design method and system for color electronic paper based on optimized square wave drive. Through a four-stage collaborative strategy of square wave optimization, temperature compensation, content classification and local refresh, the energy consumption of electronic paper can be significantly reduced while ensuring the display quality of electronic paper, and the adaptability to a wide temperature range can be enhanced.

[0004] To achieve the above objectives, the technical solution of the present invention is: a method for designing energy-saving driving of color electronic paper based on optimized square wave driving, comprising:

[0005] Step S1: Designing and generating an optimized square wave driving waveform, wherein the square wave driving waveform adopts a multi-level driving voltage and a dynamic duty cycle, and configures corresponding waveform parameters for different grayscale conversion scenarios;

[0006] Step S2: monitoring the ambient temperature in real time, and dynamically adjusting the voltage amplitude, frequency, and duty cycle of the square wave drive waveform based on a temperature compensation mechanism;

[0007] Step S3, adjusting the driving voltage in a graded manner according to the complexity of the image content;

[0008] Step S4: Identify the image change area through the frame difference algorithm, perform local refresh only on the changed area, and perform global refresh when the preset conditions are met.

[0009] Furthermore, the step S1 is specifically implemented as follows:

[0010] Step S11: Based on the relationship model (1) between the displacement of charged particles in the color electronic paper microcapsule and time, x(t) is the displacement distance of the particle at the driving time t, x max is the maximum displacement distance, τ is the time constant reflecting the inertia of particle motion, and the optimal driving voltage interval at different stages of particle motion is determined according to the model;

[0011]

[0012] Step S12: Based on the optimal driving voltage interval determined in step S11, a waveform library adapted to different grayscale transitions is generated, where the waveform parameters include voltage amplitude, frequency, and duty cycle;

[0013] Step S13: introducing a multi-level voltage switching strategy, wherein in the driving waveform, a voltage amplitude is adopted in the early driving stage that is higher than that in the late driving stage;

[0014] Step S14: Apply square wave driving signals with fixed phase differences to different color channels.

[0015] Furthermore, the step S2 is specifically implemented as follows:

[0016] Step S21, construct the relationship model (2) between temperature and microcapsule response time, where τ(T) is the time constant at temperature T, τ0 is the time constant at reference temperature T0, E a is the activation energy, R is the gas constant, and the optimal driving parameters at different temperature points are calibrated offline according to the model;

[0017]

[0018] Step S22: collecting ambient temperature in real time;

[0019] Step S23: Based on the relationship between the collected ambient temperature and the calibration in step S21, dynamically determine the voltage adjustment coefficient, frequency correction coefficient, and duty cycle correction coefficient corresponding to the current temperature through a lookup table and interpolation calculation;

[0020] Step S24: Dynamically adjust the parameters of the square wave drive waveform generated in step S1 using the correction coefficient determined in step S23.

[0021] Furthermore, the step S3 is specifically implemented as follows:

[0022] Step S31, analyzing the statistical characteristics of the input image;

[0023] Step S32: dividing the image content into multiple complexity levels according to the statistical features;

[0024] Step S33: assigning different driving voltage levels to different complexity levels.

[0025] Furthermore, the step S4 is specifically implemented as follows:

[0026] Step S41: setting a local refresh counter and detecting the difference pixel area between the current frame and the reference frame by using a frame difference algorithm;

[0027] Step S42: After each partial refresh is performed, increment the partial refresh counter;

[0028] Step S43: When the value of the local refresh counter reaches a preset threshold, a global refresh is performed and the local refresh counter is cleared; otherwise, only the optimized square wave driving waveform is applied to the changed area.

[0029] The present invention also provides a color electronic paper energy-saving driving system based on optimized square wave driving, comprising:

[0030] Waveform design module: generates optimized square wave drive waveforms with multi-level drive voltage and dynamically adjustable duty cycle;

[0031] Temperature compensation module: dynamically adjusts the parameters of the square wave drive waveform based on the ambient temperature;

[0032] Dynamic voltage adjustment module: adjusts the driving voltage level according to the complexity of the image content;

[0033] Timing control module: coordinates the operation of each module and the output timing of the driving signal;

[0034] The refresh control module is used to identify the image change area through the frame difference algorithm and control the local refresh and global refresh.

[0035] Furthermore, the image content complexity is achieved by analyzing the image histogram and classified according to the number of peaks, pixel value distribution entropy or grayscale standard deviation.

[0036] Furthermore, the image content complexity level includes a low complexity level, a medium complexity level, and a high complexity level.

[0037] Furthermore, the system hardware platform includes: an ARM Cortex-M4 microcontroller, an integrated temperature sensor, a high-voltage driver chip and a 13.3-inch 2200×1650 resolution color electronic paper panel.

[0038] Further optimization of the square wave drive waveform includes:

[0039] (1) Reset stage: using a pulse with a predetermined amplitude to eliminate residual charge;

[0040] (2) Driving stage: A combination of multi-level voltage and dynamic duty cycle is used; wherein, a first duty cycle range is used when dark color changes to light color, a second duty cycle range is used when light color changes to dark color, and a third duty cycle range is used when small grayscale changes occur; the first duty cycle range is greater than the second duty cycle range, and the third duty cycle range is between the first duty cycle range and the second duty cycle range;

[0041] (3) Multi-color channel driving stage: square waves with fixed phase differences are applied to different color channels.

[0042] Compared with the existing technology, the present invention has the following beneficial effects: the present invention reduces the driving energy consumption of color electronic paper and enhances its adaptability to a wide temperature range by designing a color electronic paper energy-saving driving design method and system based on optimized square wave drive, while ensuring the use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is an overall flow chart of a color electronic paper energy-saving drive design method and system based on optimized square wave drive according to the present invention.

[0044] Figure 2 This is a framework diagram of the local update strategy of the present invention. DETAILED DESCRIPTION

[0045] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

[0046] The present invention provides a color electronic paper energy-saving drive design method based on optimized square wave drive. The overall workflow is as follows: Figure 1 As shown. It includes the following steps:

[0047] Step S1: Generate an optimized square wave drive waveform and configure dedicated waveform parameters;

[0048] Step S2: monitor the ambient temperature in real time and dynamically adjust the drive waveform parameters;

[0049] Step S3, adjusting the driving voltage in a graded manner according to the complexity of the image content;

[0050] Step S4: Identify the image change area, perform local refresh, and perform global refresh when the preset conditions are met.

[0051] In this embodiment, step S1, based on the time relationship model of the charged particle displacement in the color electronic paper microcapsule, establishes the optimal driving voltage range of the particles and generates a square wave driving waveform library, which specifically includes the following steps:

[0052] Step S11: Based on the relationship model (1) between the displacement of charged particles in the color electronic paper microcapsule and time, x(t) is the displacement distance of the particle at the driving time t, x max is the maximum displacement distance, and τ is the time constant reflecting the inertia of particle motion. The optimal driving voltage range for different stages of particle motion is determined based on the model;

[0053]

[0054] Step S12: generating a waveform library adapted to different grayscale transitions based on the optimal driving voltage interval determined in step S11;

[0055] Step S13 introduces a multi-level voltage switching strategy, using a higher voltage amplitude in the early stage of driving than in the later stage of driving;

[0056] Step S14: Apply square wave driving signals with fixed phase differences to different color channels.

[0057] Next, step S2 monitors the ambient temperature in real time and dynamically adjusts the square wave drive waveform parameters generated in step S1, specifically including the following steps:

[0058] Step S21, construct the relationship model (2) between temperature and microcapsule response time, where τ(T) is the time constant at temperature T, τ0 is the time constant at reference temperature T0, E a is the activation energy, R is the gas constant. The optimal driving parameters at different temperature points are calibrated offline according to the model;

[0059]

[0060] Step S22: collecting ambient temperature in real time;

[0061] Step S23, dynamically determining the current temperature drive waveform correction parameter based on the relationship model between the ambient temperature and the calibration in S21;

[0062] Step S24: Dynamically adjust the square wave drive waveform parameters generated in step S1 using the correction coefficient determined in step S23.

[0063] In this embodiment, step S3, analyzing the statistical characteristics of the input image, dividing the content complexity and allocating the driving voltage level, specifically includes the following steps:

[0064] Step S31, analyzing the statistical characteristics of the input image;

[0065] Step S32: dividing the image content into multiple complexity levels according to the statistical features;

[0066] Step S33: assigning different driving voltage levels to different complexity levels.

[0067] In this embodiment, the step S4 is as follows: Figure 2 As shown, the frame difference algorithm is used to identify the image change area and perform local or global refresh, which specifically includes the following steps:

[0068] Step S41: setting a local refresh counter and detecting the difference pixel area between the current frame and the reference frame by using a frame difference algorithm;

[0069] Step S42: After each partial refresh is performed, increment the partial refresh counter;

[0070] Step S43: When the value of the local refresh counter reaches a preset threshold, a global refresh is performed and the local refresh counter is cleared; otherwise, only the optimized square wave driving waveform is applied to the changed area.

[0071] The present invention also provides a color electronic paper energy-saving driving system based on optimized square wave driving, comprising:

[0072] Waveform design module: generates optimized square wave drive waveforms with multi-level drive voltage and dynamically adjustable duty cycle;

[0073] Temperature compensation module: dynamically adjusts the parameters of the square wave drive waveform based on the ambient temperature;

[0074] Dynamic voltage adjustment module: adjusts the driving voltage level according to the complexity of the image content;

[0075] Timing control module: coordinates the operation of each module and the output timing of the driving signal;

[0076] The refresh control module is used to identify the image change area through the frame difference algorithm and control the local refresh and global refresh.

[0077] In this embodiment, the image content complexity is achieved by analyzing the image histogram and classified according to the number of peaks, pixel value distribution entropy or grayscale standard deviation. The image content complexity level includes low complexity level, medium complexity level and high complexity level.

[0078] In this embodiment, the system hardware platform includes: an ARM Cortex-M4-based microcontroller, an integrated temperature sensor, a high-voltage driver chip, and a 13.3-inch 2200×1650 resolution color electronic paper panel.

[0079] In this embodiment, the optimization of the square wave driving waveform includes:

[0080] (1) Reset stage: using a pulse with a predetermined amplitude to eliminate residual charge;

[0081] (2) Driving stage: A combination of multi-level voltage and dynamic duty cycle is used; wherein, a first duty cycle range is used when dark color changes to light color, a second duty cycle range is used when light color changes to dark color, and a third duty cycle range is used when small grayscale changes occur; the first duty cycle range is greater than the second duty cycle range, and the third duty cycle range is between the first duty cycle range and the second duty cycle range;

[0082] (3) Multi-color channel driving stage: square waves with fixed phase differences are applied to different color channels.

[0083] The above are preferred embodiments of the present invention. Any changes made according to the technical solution of the present invention, as long as the resulting functions and effects do not exceed the scope of the technical solution of the present invention, shall fall within the scope of protection of the present invention.

Claims

1. A color electronic paper energy-saving drive design method based on optimized square wave drive, characterized in that: include: Step S1: Designing and generating an optimized square wave driving waveform, wherein the square wave driving waveform adopts a multi-level driving voltage and a dynamic duty cycle, and configures corresponding waveform parameters for different grayscale conversion scenarios; Step S2: monitoring the ambient temperature in real time, and dynamically adjusting the voltage amplitude, frequency, and duty cycle of the square wave drive waveform based on a temperature compensation mechanism; Step S3, adjusting the driving voltage in a graded manner according to the complexity of the image content; Step S4: Identify the image change area through the frame difference algorithm, perform local refresh only on the changed area, and perform global refresh when the preset conditions are met.

2. The method for designing energy-saving driving of color electronic paper based on optimized square wave driving according to claim 1, characterized in that: The step S1 is specifically implemented as follows: Step S11: Based on the relationship model (1) between the displacement of charged particles in the color electronic paper microcapsule and time, x(t) is the displacement distance of the particle at the driving time t, x max is the maximum displacement distance, τ is the time constant reflecting the inertia of particle motion, and the optimal driving voltage interval at different stages of particle motion is determined according to the model; Step S12: Based on the optimal driving voltage interval determined in step S11, a waveform library adapted to different grayscale transitions is generated, where the waveform parameters include voltage amplitude, frequency, and duty cycle; Step S13: introducing a multi-level voltage switching strategy, wherein in the driving waveform, a voltage amplitude is adopted in the early driving stage that is higher than that in the late driving stage; Step S14: Apply square wave driving signals with fixed phase differences to different color channels.

3. The energy-saving driving design method for color electronic paper based on optimized square wave driving according to claim 1, characterized in that: The step S2 is specifically implemented as follows: Step S21, construct the relationship model (2) between temperature and microcapsule response time, where τ(T) is the time constant at temperature T, τ0 is the time constant at reference temperature T0, E a is the activation energy, R is the gas constant, and the optimal driving parameters at different temperature points are calibrated offline according to the model; Step S22: collecting ambient temperature in real time; Step S23: Based on the relationship between the collected ambient temperature and the calibration in step S21, dynamically determine the voltage adjustment coefficient, frequency correction coefficient, and duty cycle correction coefficient corresponding to the current temperature through a lookup table and interpolation calculation; Step S24: Dynamically adjust the parameters of the square wave drive waveform generated in step S1 using the correction coefficient determined in step S23.

4. The method for designing energy-saving driving of color electronic paper based on optimized square wave driving according to claim 1, characterized in that: The step S3 is specifically implemented as follows: Step S31, analyzing the statistical characteristics of the input image; Step S32: dividing the image content into multiple complexity levels according to the statistical features; Step S33: assigning different driving voltage levels to different complexity levels.

5. The method for designing energy-saving driving of color electronic paper based on optimized square wave driving according to claim 1, characterized in that: The step S4 is specifically implemented as follows: Step S41: setting a local refresh counter and detecting the difference pixel area between the current frame and the reference frame by using a frame difference algorithm; Step S42: After each partial refresh is performed, increment the partial refresh counter; Step S43: When the value of the local refresh counter reaches a preset threshold, a global refresh is performed and the local refresh counter is cleared; otherwise, only the optimized square wave driving waveform is applied to the changed area.

6. A color electronic paper energy-saving driving system based on optimized square wave driving, characterized in that: include: Waveform design module: generates optimized square wave drive waveforms with multi-level drive voltage and dynamically adjustable duty cycle; Temperature compensation module: dynamically adjusts the parameters of the square wave drive waveform based on the ambient temperature; Dynamic voltage adjustment module: adjusts the driving voltage level according to the complexity of the image content; Timing control module: coordinates the operation of each module and the output timing of the driving signal; Refresh control module: used to identify image change areas through frame difference algorithm and control local refresh and global refresh.

7. The energy-saving driving system for color electronic paper based on optimized square wave driving according to claim 6, characterized in that: The image content complexity is achieved by analyzing the image histogram and is classified according to the number of peaks, pixel value distribution entropy or gray level standard deviation.

8. The energy-saving driving system for color electronic paper based on optimized square wave driving according to claim 7, characterized in that: The image content complexity levels include low complexity level, medium complexity level and high complexity level.

9. The energy-saving driving system for color electronic paper based on optimized square wave driving according to claim 6, characterized in that: The system hardware platform includes: an ARM Cortex-M4 microcontroller, an integrated temperature sensor, a high-voltage driver chip and a 13.3-inch 2200×1650 resolution color electronic paper panel.

10. The energy-saving driving system for color electronic paper based on optimized square wave driving according to claim 6, characterized in that: The optimization of square wave drive waveform includes: (1) Reset stage: using a pulse with a predetermined amplitude to eliminate residual charge; (2) Driving stage: A combination of multi-level voltage and dynamic duty cycle is used; wherein, a first duty cycle range is used when dark color changes to light color, a second duty cycle range is used when light color changes to dark color, and a third duty cycle range is used when small grayscale changes occur; the first duty cycle range is greater than the second duty cycle range, and the third duty cycle range is between the first duty cycle range and the second duty cycle range; (3) Multi-color channel driving stage: square waves with fixed phase differences are applied to different color channels.

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