Low-power-consumption display screen driving method and system based on OLED technology

Abstract

The invention relates to the technical field of display screen driving, in particular to a low-power-consumption display screen driving method and system based on the OLED technology, and the method comprises the steps: S1, carrying out the image feature detection, collecting the inter-frame brightness change rate, the sub-pixel gray level distribution and the regional temperature gradient, and generating a dynamic driving signal parameter; s2, voltage compensation adjustment: dividing a power consumption area according to a brightness change rate, calculating a brightness compensation coefficient and correcting the voltage by combining gray level distribution and a temperature gradient, and realizing sub-pixel voltage dynamic adjustment; and S3, refresh frequency control: adjusting a local refresh rate according to the compensation coefficient and the correction voltage, executing a frequency reduction strategy on a high-power-consumption area, triggering ghosting suppression on a low-power-consumption area, and applying a temperature threshold to constrain a refresh upper limit. According to the invention, energy-saving driving, ghost suppression and brightness balance of the OLED display screen are realized, and the display performance and the system intelligence are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of display screen driving, and in particular to a low-power display screen driving method and system based on OLED technology. Background Art

[0002] With the increasing demand for high-resolution and high-definition displays, OLED (organic light-emitting diode) display technology has been widely used in terminals such as smartphones, wearable devices, TVs and car displays due to its advantages such as self-luminescence, high contrast and wide viewing angle. However, as an active light-emitting device, the energy consumption level of OLED panels during the driving process is closely related to the panel brightness, pixel distribution and temperature state. In the face of changing display images and complex usage environments, how to achieve low-power driving of OLED displays while ensuring image quality has become one of the key technical issues currently concerned by the industry.

[0003] Existing OLED driving technologies generally adopt a fixed refresh rate and a unified voltage compensation strategy, failing to differentiate the grayscale dynamic characteristics and temperature gradients of different display areas, resulting in energy waste in high-power areas and serious ghosting in low-power areas. At the same time, traditional voltage compensation models are mostly based on preset static grayscale tables, lacking the ability to perceive brightness attenuation trends and thermal sensitivity in real time, which can easily cause problems such as uneven screen brightness and insufficient driving accuracy. In addition, the existing refresh control mechanism lacks regional-level temperature regulation protection measures, and the system lacks robustness under high load or high-temperature scenarios, making it difficult to meet the needs of efficient, intelligent, and long-life display control. Summary of the Invention

[0004] The present invention provides a low-power display screen driving method and system based on OLED technology. It can not only dynamically reduce the refresh frequency in high-power consumption areas to save energy, introduce an afterimage suppression mechanism in low-power consumption areas to improve the display quality in dark areas, but also enhance system stability through a temperature gradient constraint strategy, thereby significantly improving the energy efficiency level, image consistency and operational reliability of the OLED display screen.

[0005] A low-power display screen driving method based on OLED technology includes the following steps:

[0006] S1, picture feature detection: Real-time detection of the display's dynamic picture feature parameters, including inter-frame brightness change rate, sub-pixel grayscale distribution matrix, and regional temperature gradient, to generate dynamic drive signal parameters;

[0007] S2, voltage compensation adjustment: Based on the dynamic drive signal parameters, the inter-frame brightness change rate is divided into high and low power consumption areas. The brightness attenuation compensation coefficient of each area is calculated based on the sub-pixel grayscale distribution matrix. The compensation voltage value is corrected based on the regional temperature gradient to achieve dynamic adjustment of the target sub-pixel voltage compensation parameter;

[0008] S3, refresh frequency control: Dynamically adjust the refresh frequency threshold of the local area based on the output brightness attenuation compensation coefficient and compensation voltage value. Among them, an adaptive frequency reduction refresh strategy is adopted for high-power consumption areas, and the ghosting suppression algorithm is enabled for low-power consumption areas. The maximum refresh rate is limited based on the temperature gradient threshold.

[0009] Optionally, the picture feature detection in S1 includes:

[0010] S11, screen segmentation and parallel sampling: Divide the display screen into multiple rectangular detection blocks and perform operations synchronously within each block, including:

[0011] Sample the grayscale values ​​of all sub-pixels in the current frame to generate an original grayscale dataset;

[0012] The micro temperature sensor group integrated at the edge of the block collects the temperature values ​​at the center and four corners of the block and calculates the maximum temperature difference ΔT within the block. i ;

[0013] S12, calculation of inter-frame brightness change rate: For each detection block, extract the grayscale data set of the corresponding block in the previous frame, and calculate the average brightness difference ΔL between the current frame and the previous frame. i , if ΔL i >θ L , then mark the block as a high dynamic area, where θ L is a preset dynamic threshold;

[0014] S13, constructing a sub-pixel grayscale distribution matrix: performing statistical analysis on the original grayscale data set of each detection block to construct a sub-pixel grayscale distribution matrix;

[0015] S14, regional temperature gradient mapping: Based on the ΔT of each block i Perform gradient grading. If ΔT i ≥3℃, marked as level 3 gradient (high risk), if 1℃≤ΔT i <3℃, marked as secondary gradient (medium risk), if ΔT i <1°C, marked as first-level gradient (low risk);

[0016] S15, dynamic drive signal parameter synthesis: The high dynamic area marking results, sub-pixel grayscale distribution matrix and temperature gradient level are integrated to generate a drive parameter table including block coordinates, dynamic level, grayscale distribution pattern and temperature gradient level, and the drive parameter table is converted into a voltage compensation and refresh rate control instruction set through preset hash mapping rules.

[0017] Optionally, the sub-pixel grayscale distribution matrix construction in S13 includes:

[0018] S131, grayscale distribution vector generation: grayscale values ​​0-255 are divided into 8 intervals, and the proportion of sub-pixels in each interval is counted to generate an 8-dimensional distribution vector;

[0019] S132, constructing a multi-block grayscale matrix: combining the distribution vectors of four adjacent blocks into a 32-dimensional matrix as a sub-pixel grayscale distribution matrix.

[0020] Optionally, the voltage compensation adjustment in S2 includes:

[0021] S21, dynamic division of high / low power consumption areas: based on the inter-frame brightness change rate ΔL in the generated dynamic driving signal parameters i , for each detection block B i Perform power consumption classification;

[0022] S22, grayscale distribution matrix analysis and compensation coefficient generation: Analyze the sub-pixel grayscale distribution matrix of each block and generate a modified brightness compensation coefficient for calculating the initial compensation voltage V comp,i ;

[0023] S23, temperature gradient driven voltage correction: dynamically correct the compensation voltage value according to the regional temperature gradient level and calculate the corresponding correction value ΔV i , and generate the voltage correction compensation voltage value V final,i , specifically including:

[0024] For the third-level gradient (high risk) area, ΔV i =V comp,i β H , where β H =0.08 is the temperature correction coefficient;

[0025] For the secondary gradient (medium risk) area, ΔV i =V comp,i β M , where β M =0.03 is the temperature correction coefficient;

[0026] For the first-level gradient (low risk) area, ΔV i =0;

[0027] S24, voltage parameter dynamic loading: the corrected compensation voltage value V final,i Write the driver circuit according to the predetermined rules, including:

[0028] For high power consumption areas, the voltage parameters are updated once per frame;

[0029] For the low power consumption area, the voltage parameters are updated every 3 frames, and the afterimage suppression pulse is inserted in the non-updated frame.

[0030] Optionally, the dynamic division of high / low power consumption areas in S21 includes:

[0031] S211, if the block's ΔL i ≥θ H , then mark B i is the high power consumption area, where θ H is the first brightness change threshold;

[0032] S212, if the block's ΔL i <θ L , it is marked as low power consumption area, where θ L is the second brightness change threshold;

[0033] S213, if θ L ≤ΔL i <θ H , it is judged as a transition area, and the weighted algorithm is used to calculate the current weighted power consumption index Γ in combination with the historical state i , determine the current category again, if Γ i ≥θ H , it is classified as a high power consumption area, otherwise it is classified as a low power consumption area.

[0034] Optionally, the grayscale distribution matrix analysis and compensation coefficient generation in S22 include:

[0035] S221 represents grayscale interval extraction: extracting the grayscale interval with the highest proportion in the grayscale distribution matrix (low grayscale: 0-50, medium grayscale: 51-150, high grayscale: 151-255);

[0036] S222, basic brightness compensation coefficient table lookup: according to the grayscale interval, the preset brightness attenuation coefficient table is searched to obtain the basic compensation coefficient C base,i ;

[0037] S223, temperature-weighted brightness coefficient correction: performing additional temperature-weighted compensation according to the temperature gradient level of the block, and calculating a corrected brightness compensation coefficient.

[0038] Optionally, the refresh frequency control in S3 includes:

[0039] S31, regional refresh rate threshold calculation: according to the output brightness attenuation compensation coefficient C adj,i And the compensation voltage value V final,i , calculate the region refresh rate threshold;

[0040] S32, adaptive frequency reduction refresh strategy: dynamically adjust the actual refresh rate for high power consumption areas;

[0041] S33, afterimage suppression algorithm trigger: for low power consumption area, when And the number of consecutive frames N i ≥N thres When the reverse voltage pulse is enabled, θ static is the static threshold, N thres is the minimum trigger frame number, and calculate the pulse width T pulse,i ;

[0042] S34, temperature gradient threshold constraint: imposes a hard limit on the maximum refresh rate of all regions. If ΔT i ≥3℃, mandatory maximum refresh rate F limit,i =0.4·F max , if ΔT i ≥5℃,F limit,i =0.3·F max , and trigger global frequency reduction protection;

[0043] S35, dynamic loading of refresh parameters: writing the final refresh rate parameters into the driver circuit, specifically including:

[0044] The refresh rate is updated synchronously with each frame in high power consumption areas;

[0045] The low-power area updates the refresh rate every 5 frames and inserts image sticking suppression pulse sequences during non-updating frames.

[0046] Optionally, the calculation of the area refresh rate threshold in S31 includes:

[0047] For high power consumption areas, calculate the initial refresh rate threshold F base,i =F max ·(1-C adj,i γ);

[0048] Among them, F base,i is the basic refresh rate of the i-th block, F max is the maximum refresh rate supported by the screen, γ is the refresh rate adjustment coefficient, C adj,i is the brightness compensation coefficient;

[0049] For low power consumption areas, set a fixed refresh rate threshold F base,i =F max 0.3.

[0050] Optionally, the adaptive frequency reduction refresh strategy in S32 includes:

[0051] If the regional temperature gradient level is level one, F real,i =min(F base,i ,0.9·F max );

[0052] If the regional temperature gradient level is level 2, F real,i =min(F base,i 0.8,0.7 F max );

[0053] If the regional temperature gradient level is level three, F real,i =min(F base,i 0.6,0.5 F max ).

[0054] A low-power display screen driving system based on OLED technology, used to implement the above-mentioned low-power display screen driving method based on OLED technology, includes the following modules:

[0055] Characteristic parameter acquisition module: acquires the inter-frame brightness change rate, sub-pixel grayscale distribution matrix and regional temperature gradient of the display screen in real time, and generates dynamic drive signal parameters;

[0056] Voltage compensation control module: divides high and low power consumption areas according to dynamic drive signal parameters, calculates brightness attenuation compensation coefficients, and corrects compensation voltage values ​​based on regional temperature gradients;

[0057] Refresh frequency control module: Dynamically adjusts the refresh frequency threshold of each local area based on the brightness compensation coefficient and the compensation voltage value, implements adaptive frequency reduction in high-power consumption areas, implements ghosting suppression strategy in low-power consumption areas, and limits the maximum refresh rate through temperature gradient constraints.

[0058] Beneficial effects of the present invention:

[0059] The present invention introduces a real-time detection mechanism for multi-dimensional dynamic picture feature parameters, and combines the inter-frame brightness change rate and regional temperature gradient to achieve refined high- and low-power consumption area identification, which can effectively distinguish the energy consumption levels of different display blocks. On this basis, by adjusting the voltage compensation parameters and local refresh rate of the target sub-pixel, the driving frequency of the high-power consumption area is adaptively reduced, thereby significantly reducing the power consumption of the entire OLED display panel while ensuring the visual effect, and achieving better energy efficiency management.

[0060] This invention sets exclusive compensation coefficients for the brightness attenuation characteristics at different grayscale levels and introduces a temperature-weighted correction mechanism to construct a multi-level brightness compensation model, effectively improving the brightness consistency and response stability of various types of picture content. For low-power areas, by detecting the static frame state of the brightness change rate, the reverse voltage pulse is dynamically triggered to suppress image sticking and enhance the clarity and contrast of dark display, thereby extending the service life of the OLED panel and improving the visual experience.

[0061] The present invention integrates screen block sampling, grayscale distribution modeling, temperature field mapping, compensation voltage control and refresh rate adjustment into one, constructing a closed-loop driving method based on dynamic perception and multi-parameter fusion. It can adaptively adjust the response strategy of each sub-module according to the changes in the picture, and realize differentiated driving logic with high dynamic strong response and low dynamic energy-saving control. At the same time, it introduces historical state weighted judgment and temperature threshold protection mechanism to improve the stability and robustness of the system in complex usage scenarios. It is suitable for various occasions such as smart phones, wearable devices, and high-end display terminals. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0063] Figure 1 This is a schematic flow chart of a driving method according to an embodiment of the present invention;

[0064] Figure 2 Schematic diagram of system function modules according to an embodiment of the present invention. DETAILED DESCRIPTION

[0065] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0066] like Figure 1 As shown, a low-power display screen driving method based on OLED technology includes the following steps:

[0067] S1, picture feature detection: Real-time detection of the display's dynamic picture feature parameters, including inter-frame brightness change rate, sub-pixel grayscale distribution matrix, and regional temperature gradient, to generate dynamic drive signal parameters;

[0068] S2, voltage compensation adjustment: Based on the dynamic drive signal parameters, the inter-frame brightness change rate is divided into high and low power consumption areas. The brightness attenuation compensation coefficient of each area is calculated based on the sub-pixel grayscale distribution matrix. The compensation voltage value is corrected based on the regional temperature gradient to achieve dynamic adjustment of the target sub-pixel voltage compensation parameter;

[0069] S3, refresh frequency control: Dynamically adjust the refresh frequency threshold of the local area based on the output brightness attenuation compensation coefficient and compensation voltage value. Among them, an adaptive frequency reduction refresh strategy is adopted for high-power consumption areas, and the ghosting suppression algorithm is enabled for low-power consumption areas. The maximum refresh rate is limited based on the temperature gradient threshold.

[0070] Through the above content, regional dynamic drive control of OLED display screens can be achieved. Not only can fine-grained frequency reduction be implemented in high-power consumption areas to reduce overall energy consumption, but ghosting can also be effectively suppressed in low-power consumption areas. At the same time, temperature gradient constraints are introduced to improve drive stability, thereby taking into account energy saving, image quality consistency and system reliability.

[0071] Picture feature detection in S1 includes:

[0072] S11, screen segmentation and parallel sampling: Divide the entire OLED display into several rectangular detection blocks B i , where i represents the block number. For each block, perform the following operations:

[0073] For B in the current frame i All sub-pixel grayscale values ​​within the block are sampled to generate a grayscale data set in, represents the grayscale value of the 1st, 2nd, ..., Nth sub-pixel in the i-th block at time t in the current frame, where N is the number of sub-pixels;

[0074] The temperature of the block center is obtained by setting up a micro temperature sensor group at the edge of each block. and four corner points The temperature value of the block is calculated as follows:

[0075]

[0076] S12, calculation of inter-frame brightness change rate: for each detection block B i , get the grayscale data set of the previous frame And calculate the average brightness difference ΔL between the current frame and the previous frame i , expressed as:

[0077]

[0078] Where, ΔL iis the inter-frame brightness change rate of the i-th block, is the grayscale value of the kth sub-pixel in the i-th block in the current frame, is the grayscale value of the sub-pixel at the same position in the previous frame;

[0079] If ΔL i >θ L (where θ L is a preset dynamic threshold, which is 10% of the maximum grayscale of the current frame), then the block is marked as a high dynamic area;

[0080] S13, constructing the sub-pixel grayscale distribution matrix: for each block B i Grayscale data set Conduct statistical analysis, including:

[0081] Divide the grayscale value interval [0,255] into 8 level intervals R j , where j = 1, 2, ..., 8, and the width of each interval is 32;

[0082] Count each grayscale interval R j The number of neutron pixels and their proportion are calculated as follows:

[0083]

[0084] Among them, P i,j is the proportion of sub-pixels in the jth grayscale interval in the i-th block, n i,j is the number of sub-pixels in the j-th grayscale interval;

[0085] P i,1 ,P i,2 ,…,P i,8 Composed of 8-dimensional vector V i , then concatenate the grayscale distribution vectors of the four adjacent blocks to construct a 32-dimensional sub-pixel grayscale distribution matrix Where w is the number of horizontal blocks of the display screen;

[0086] S14, regional temperature gradient mapping: the maximum temperature difference ΔT of each block i Mapped to temperature gradient levels The division is as follows:

[0087]

[0088] S15, dynamic drive signal parameter synthesis: the analysis results of each block are integrated to generate a drive parameter table D i , expressed as:

[0089]

[0090] Among them, IDi is the block number, and the dynamic level i is a Boolean flag indicating whether it is a high dynamic area. is the sub-pixel grayscale distribution matrix, is the temperature gradient level;

[0091] Through the preset hash mapping function Drive parameter table D i Converted into a control instruction set, expressed as:

[0092]

[0093] in, is the voltage compensation value of the target sub-pixel, The refresh frequency control parameter for this block.

[0094] Through the above content, the OLED display screen is partitioned and blocked, and combined with grayscale sampling, brightness change rate analysis and temperature sensing fusion, it realizes the refined perception and structured modeling of dynamic picture features, and can accurately identify high dynamic areas and thermal gradient risk areas, thereby providing precise support for subsequent voltage compensation and refresh frequency control, effectively improving the targeted drive response, the accuracy of energy consumption regulation and the environmental adaptability of system operation.

[0095] The voltage compensation adjustment in S2 includes:

[0096] S21, dynamic division of high / low power consumption areas: based on the inter-frame brightness change rate ΔL in the generated dynamic driving signal parameters i , for each detection block B i The power consumption level classification is performed according to the following rules:

[0097] If ΔL i ≥θ H (The first brightness change threshold is 15%), then mark B i It is a high power consumption area;

[0098] If ΔL i <θ L (Second brightness change threshold, value is 5%), it is marked as a low power consumption area;

[0099] If θ L ≤ΔL i <θ H , it is judged as a transition area, and the weighted algorithm is used in combination with the historical status to determine the current category again:

[0100]

[0101] Among them, Γ i is the current weighted power consumption index, is the power consumption mark of the previous frame (1: high power consumption, 0: low power consumption), α is the historical state weight factor, if Γ i ≥θ H , it is still classified as a high power consumption area, otherwise it is classified as a low power consumption area;

[0102] S22, grayscale distribution matrix analysis and compensation coefficient generation: for each block B i Grayscale distribution matrix Conduct statistical analysis, including:

[0103] The grayscale subinterval R with the highest proportion in the matrix max As representative grayscale segments, the segments are: 0-50 (low grayscale), 51-150 (medium grayscale), 151-255 (high grayscale);

[0104] According to R max interval, find the basic compensation coefficient C in the preset brightness attenuation coefficient table base,i , the brightness attenuation coefficient is as follows:

[0105]

[0106] According to the temperature gradient level of the block Perform additional temperature weighted compensation and calculate the correction factor:

[0107]

[0108] Among them, C adj,i is the final corrected brightness compensation coefficient used for calculating the compensation voltage, λ g is the temperature weight coefficient set for the current grayscale range (low grayscale is set to 0.1, medium grayscale is set to 0.05, and high grayscale is set to 0.02). is the temperature gradient level (1 = low, 2 = medium, 3 = high);

[0109] S23, temperature gradient driven voltage correction: at the initial value of compensation voltage V comp,i On this basis, correction is made according to the temperature gradient level, which is expressed as:

[0110] V comp,i =V nom C adj,i ;

[0111] Among them, V nom is the nominal driving voltage at the corresponding grayscale level;

[0112]

[0113] Among them, β H =0.08, β M=0.03 is the temperature correction coefficient, ΔV i is the correction amount;

[0114] Output compensation voltage value: V final,i =V comp,i +ΔV i ;

[0115] S24, voltage parameter dynamic loading: the compensation voltage value V final,i Loaded into the OLED drive circuit, the control strategy is as follows:

[0116] If B i If it belongs to the high power consumption area, the compensation voltage value of the block is updated once per frame;

[0117] If B i In the low power consumption area, it is updated every 3 frames and an afterimage suppression pulse signal P is injected in the non-update frame. ghost,i , its amplitude is 20% less than the normal driving voltage, that is, P ghost,i =0.2·V final,i This afterimage pulse can periodically activate low-grayscale pixels and reduce the afterimage phenomenon without significantly increasing power consumption.

[0118] Through the above content, a precise and adjustable sub-pixel voltage control mechanism was constructed, which not only significantly improved the targeted energy consumption management, but also effectively alleviated the problems of uneven brightness and aging differences. At the same time, the system's response efficiency and display consistency were enhanced through regional dynamic loading strategies.

[0119] Refresh rate control in S3 includes:

[0120] S31, regional refresh rate threshold calculation: according to the output brightness compensation coefficient C adj,i And the compensation voltage value V final,i , calculate each block B i The basic refresh rate threshold F base,i , specifically including:

[0121] For high power consumption areas: F base,i =F max ·(1-C adj,i γ);

[0122] Among them, F base,i is the basic refresh rate of the i-th block, F max is the maximum refresh rate supported by the screen, γ is the refresh rate adjustment coefficient, C adj,i is the brightness compensation coefficient;

[0123] For low power consumption areas, set a fixed ratio: F base,i =F max 0.3;

[0124] S32, adaptive frequency reduction refresh strategy: for high power consumption areas, according to the temperature gradient level Dynamically adjust the actual refresh rate F real,i , specifically including:

[0125] like (Low risk): F real,i =min(F base,i ,0.9·F max );

[0126] like (Medium risk): F real,i =min(F base,i 0.8,0.7 F max );

[0127] like (High risk): F real,i =min(F base,i 0.6,0.5 F max );

[0128] S33, afterimage suppression algorithm is triggered: for low power consumption area, when N consecutive i The ghosting suppression mechanism is triggered when the frame brightness change rate meets the following conditions:

[0129] And the number of consecutive frames N i ≥N thres ;

[0130] in, is the inter-frame brightness change rate of the tth frame in the i-th block, θ static is a static threshold, set to 5%, N thres The minimum trigger frame number is set to 3;

[0131] After triggering, a reverse voltage pulse is applied with a pulse width of T pulse,i Calculated as:

[0132] T pulse,i =K i ·N i ;

[0133] Among them, K i is the temperature gradient correlation coefficient, which varies with the temperature risk level;

[0134] S34, temperature gradient threshold constraint: for all blocks B i , based on the actual measured maximum temperature gradient ΔT i Limit its maximum allowed refresh rate F limit,i , if ΔT i≥3℃,F limit,i =0.4·F max , if ΔT i ≥5℃,F limit,i =0.3·F max And trigger the global frequency reduction mode, the final refresh rate is:

[0135] F final,i =min(F real,i ,F limit,i );

[0136] S35, refresh parameter dynamic loading: the final calculated F final,i The refresh rate is written into the driver circuit, and the block type is updated for scheduling, including:

[0137] High power consumption area: real-time update of refresh rate per frame;

[0138] Low power area: The refresh rate is updated every 5 frames, and the generated ghosting suppression pulses are inserted in the non-updated frames.

[0139] Through the above content, combined with the brightness compensation coefficient, voltage correction value and temperature gradient level, the refresh rate threshold of each block is dynamically calculated, and differentiated frequency reduction strategies and ghosting suppression algorithms are adopted to achieve adaptive energy-saving control in high-power consumption areas and display quality optimization in low-power consumption areas; at the same time, the temperature threshold limit mechanism is used to enhance the operating stability in high-temperature environments, thereby significantly improving the energy efficiency level, image consistency and safety robustness of the OLED drive system.

[0140] like Figure 2 As shown, a low-power display screen driving system based on OLED technology is used to implement the above-mentioned low-power display screen driving method based on OLED technology, including the following modules:

[0141] Characteristic parameter acquisition module: acquires the inter-frame brightness change rate, sub-pixel grayscale distribution matrix and regional temperature gradient of the display screen in real time, and generates dynamic drive signal parameters;

[0142] Voltage compensation control module: divides high and low power consumption areas according to dynamic drive signal parameters, calculates brightness attenuation compensation coefficients, and corrects compensation voltage values ​​based on regional temperature gradients;

[0143] Refresh frequency control module: Dynamically adjusts the refresh frequency threshold of each local area based on the brightness compensation coefficient and the compensation voltage value, implements adaptive frequency reduction in high-power consumption areas, implements ghosting suppression strategy in low-power consumption areas, and limits the maximum refresh rate through temperature gradient constraints.

[0144] The present invention encompasses any alternatives, modifications, equivalents, and solutions that fall within the spirit and scope of the present invention. To provide a thorough understanding of the present invention, specific details are described in detail below in connection with the preferred embodiments of the present invention, but those skilled in the art will be able to fully understand the present invention without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of the present invention, well-known methods, processes, procedures, components, and circuits have not been described in detail.

[0145] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A low-power display screen driving method based on OLED technology, characterized in that: The following steps are involved: S1, picture feature detection: Real-time detection of the display's dynamic picture feature parameters, including inter-frame brightness change rate, sub-pixel grayscale distribution matrix, and regional temperature gradient, to generate dynamic drive signal parameters; S2, voltage compensation adjustment: Based on the dynamic drive signal parameters, the inter-frame brightness change rate is divided into high and low power consumption areas. The brightness attenuation compensation coefficient of each area is calculated based on the sub-pixel grayscale distribution matrix. The compensation voltage value is corrected based on the regional temperature gradient to achieve dynamic adjustment of the target sub-pixel voltage compensation parameter; S3, refresh frequency control: Dynamically adjust the refresh frequency threshold of the local area based on the output brightness attenuation compensation coefficient and compensation voltage value. Among them, an adaptive frequency reduction refresh strategy is adopted for high-power consumption areas, and the ghosting suppression algorithm is enabled for low-power consumption areas. The maximum refresh rate is limited based on the temperature gradient threshold.

2. The low-power display screen driving method based on OLED technology according to claim 1, characterized in that: The picture feature detection in S1 includes: S11, screen segmentation and parallel sampling: Divide the display screen into multiple rectangular detection blocks and perform operations synchronously within each block, including: Sample the grayscale values ​​of all sub-pixels in the current frame to generate an original grayscale dataset; The micro temperature sensor group integrated at the edge of the block collects the temperature values ​​at the center and four corners of the block and calculates the maximum temperature difference ΔT within the block. i ; S12, calculation of inter-frame brightness change rate: For each detection block, extract the grayscale data set of the corresponding block in the previous frame, and calculate the average brightness difference ΔL between the current frame and the previous frame. i , if ΔL i >θ L , then mark the block as a high dynamic area, where θ L is a preset dynamic threshold; S13, constructing a sub-pixel grayscale distribution matrix: performing statistical analysis on the original grayscale data set of each detection block to construct a sub-pixel grayscale distribution matrix; S14, regional temperature gradient mapping: Based on the ΔT of each block i Perform gradient grading, if ΔT i ≥3℃, marked as three-level gradient, if 1℃≤ΔT i <3℃, marked as secondary gradient, if ΔT i <1°C, marked as first-order gradient; S15, dynamic drive signal parameter synthesis: The high dynamic area marking results, sub-pixel grayscale distribution matrix and temperature gradient level are integrated to generate a drive parameter table including block coordinates, dynamic level, grayscale distribution pattern and temperature gradient level, and the drive parameter table is converted into a voltage compensation and refresh rate control instruction set through preset hash mapping rules.

3. The low-power display screen driving method based on OLED technology according to claim 2, characterized in that: The sub-pixel grayscale distribution matrix construction in S13 includes: S131, grayscale distribution vector generation: grayscale values ​​0-255 are divided into 8 intervals, and the proportion of sub-pixels in each interval is counted to generate an 8-dimensional distribution vector; S132, constructing a multi-block grayscale matrix: combining the distribution vectors of four adjacent blocks into a 32-dimensional matrix as a sub-pixel grayscale distribution matrix.

4. The low-power display screen driving method based on OLED technology according to claim 1, characterized in that: The voltage compensation adjustment in S2 includes: S21, dynamic division of high / low power consumption areas: based on the inter-frame brightness change rate ΔL in the generated dynamic driving signal parameters i , for each detection block B i Perform power consumption classification; S22, grayscale distribution matrix analysis and compensation coefficient generation: Analyze the sub-pixel grayscale distribution matrix of each block and generate a modified brightness compensation coefficient for calculating the initial compensation voltage V comp,i ; S23, temperature gradient driven voltage correction: dynamically correct the compensation voltage value according to the regional temperature gradient level and calculate the corresponding correction value ΔV i , and generate the voltage correction compensation voltage value V final,i , specifically including: For the three-level gradient region, ΔV i =V comp,i β H , where β H is the temperature correction coefficient; For the secondary gradient region, ΔV i =V comp,i β M , where β M is the temperature correction coefficient; For the first-order gradient region, ΔV i =0; S24, voltage parameter dynamic loading: the corrected compensation voltage value V final,i Write the driver circuit according to the predetermined rules, including: For high power consumption areas, the voltage parameters are updated once per frame; For the low power consumption area, the voltage parameters are updated every 3 frames, and the afterimage suppression pulse is inserted in the non-updated frame.

5. The low-power display screen driving method based on OLED technology according to claim 4, characterized in that: The dynamic division of high / low power consumption areas in S21 includes: S211, if the block's ΔL i ≥θ H , then mark B i is the high power consumption area, where θ H is the first brightness change threshold; S212, if the block's ΔL i <θ L , it is marked as low power consumption area, where θ L is the second brightness change threshold; S213, if θ L ≤ΔL i <θ H , it is judged as a transition area, and the weighted algorithm is used to calculate the current weighted power consumption index Γ in combination with the historical state i , determine the current category again, if Γ i ≥θ H , it is classified as a high power consumption area, otherwise it is classified as a low power consumption area.

6. The low-power display screen driving method based on OLED technology according to claim 5, characterized in that: The grayscale distribution matrix analysis and compensation coefficient generation in S22 include: S221, represents grayscale interval extraction: extracting the grayscale interval with the highest proportion in the grayscale distribution matrix; S222, basic brightness compensation coefficient table lookup: according to the grayscale interval, the preset brightness attenuation coefficient table is searched to obtain the basic compensation coefficient C base,i ; S223, temperature-weighted brightness coefficient correction: performing additional temperature-weighted compensation according to the temperature gradient level of the block, and calculating a corrected brightness compensation coefficient.

7. The low-power display screen driving method based on OLED technology according to claim 6, characterized in that: The refresh frequency control in S3 includes: S31, regional refresh rate threshold calculation: according to the output brightness attenuation compensation coefficient C adj,i And the compensation voltage value V final,i , calculate the region refresh rate threshold; S32, adaptive frequency reduction refresh strategy: dynamically adjust the actual refresh rate for high power consumption areas; S33, afterimage suppression algorithm trigger: for low power consumption area, when And the number of consecutive frames N i ≥N thres When the reverse voltage pulse is enabled, θ static is the static threshold, N thres is the minimum trigger frame number, and calculate the pulse width T pulse,i ; S34, temperature gradient threshold constraint: imposes a hard limit on the maximum refresh rate of all regions. If ΔT i ≥3℃, mandatory maximum refresh rate F limit,i =0.4·F max , if ΔT i ≥5℃,F limit,i =0.3·F max , and trigger global frequency reduction protection; S35, dynamic loading of refresh parameters: writing the final refresh rate parameters into the driver circuit, specifically including: The refresh rate is updated synchronously with each frame in high power consumption areas; The low-power area updates the refresh rate every 5 frames and inserts image sticking suppression pulse sequences during non-updating frames.

8. The low-power display screen driving method based on OLED technology according to claim 7, characterized in that: The calculation of the area refresh rate threshold in S31 includes: For high power consumption areas, calculate the initial refresh rate threshold F base,i =F max ·(1-C adj,i γ); Among them, F base,i is the basic refresh rate of the i-th block, F max is the maximum refresh rate supported by the screen, γ is the refresh rate adjustment coefficient, C adj,i is the brightness compensation coefficient; For low power consumption areas, set a fixed refresh rate threshold F base,i =F max 0.

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9. The low-power display screen driving method based on OLED technology according to claim 8, characterized in that: The adaptive frequency reduction refresh strategy in S32 includes: If the regional temperature gradient level is level one, F real,i =min(F base,i ,0.9·F max ); If the regional temperature gradient level is level 2, F real,i =min(F base,i 0.8,0.7 F max ); If the regional temperature gradient level is level three, F real,i =min(F base,i 0.6,0.5 F max ).

10. A low-power display screen driving system based on OLED technology, used to implement a low-power display screen driving method based on OLED technology as claimed in any one of claims 1 to 9, characterized in that: Includes the following modules: Characteristic parameter acquisition module: acquires the inter-frame brightness change rate, sub-pixel grayscale distribution matrix and regional temperature gradient of the display screen in real time, and generates dynamic drive signal parameters; Voltage compensation control module: divides high and low power consumption areas according to dynamic drive signal parameters, calculates brightness attenuation compensation coefficients, and corrects compensation voltage values ​​based on regional temperature gradients; Refresh frequency control module: Dynamically adjusts the refresh frequency threshold of each local area based on the brightness compensation coefficient and the compensation voltage value, implements adaptive frequency reduction in high-power consumption areas, implements ghosting suppression strategy in low-power consumption areas, and limits the maximum refresh rate through temperature gradient constraints.

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