Overcurrent protection method, overcurrent protection device and display panel

Abstract

This application belongs to the field of display driving technology, specifically relating to an overcurrent protection method, an overcurrent protection device, and a display panel. The method includes acquiring the pulse peak value and the target occurrence time corresponding to the pulse peak value in the current sampling sequence; calculating the descent slope of the current sampling sequence based on sampling points within a preset time window after the pulse peak value; monitoring the recovery time when the pulse peak value in the current sampling sequence drops to a preset normal current value, and calculating the recovery time from the target occurrence time to the recovery time; determining that the driving current is abnormal when the absolute value of the descent slope is less than a preset slope threshold and / or the recovery time is greater than a preset duration threshold. This application improves the detection accuracy of pulse current in high scan rate mode through a collaborative working mechanism of descent slope detection and recovery time detection, avoiding damage to the polarizer due to continuously high abnormal pulse current, thereby ensuring the safety and reliability of the display panel.

Description

Technical Field

[0001] This disclosure belongs to the field of display driver technology, specifically relating to an overcurrent protection method, an overcurrent protection device, and a display panel. Background Technology

[0002] In the field of LCD displays, with the rapid development of high scan rate (HSR) and double-line gate (DLG) modes, the driving frequency has increased significantly, and the gate driving current has increased sharply, leading to a dramatic rise in power consumption and heat generation in the gate driving circuit. When an abnormal short circuit occurs inside the panel, the abnormal pulse current superimposed on the high current background can easily cause local overheating, which can burn out the polarizer and even cause a fire.

[0003] The current overcurrent protection mechanism uses a level shifter chip to set fixed current thresholds for drive signal lines such as clock signals, latch signals, and start pulse signals, and combines detection time and blanking time to detect large current conditions within the plane. However, this detection method has a single detection dimension in high scan rate mode, and can identify fewer types of anomalies, making it difficult to comprehensively capture complex pulse current changes. This results in a significant reduction in detection accuracy, an inability to effectively distinguish between normal large currents and abnormal pulse currents, and the existence of protection blind spots.

[0004] Therefore, how to improve the overcurrent detection accuracy of pulse current in high scan rate mode and avoid damage to the polarizer caused by high temperature due to abnormal pulse current is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] This application provides an overcurrent protection method, an overcurrent protection device, and a display panel. By using a collaborative working mechanism of descent slope detection and recovery time detection, this application improves the overcurrent detection accuracy of pulse current in high scan rate mode, avoids the problem of damage to the polarizer due to abnormal pulse current being continuously too high, and thus ensures the safety and reliability of the display panel.

[0006] In a first aspect, this application provides an overcurrent protection method, the overcurrent protection method comprising: acquiring real-time drive current on a drive signal line to obtain a current sampling sequence; acquiring a pulse peak value and a target occurrence time corresponding to the pulse peak value in the current sampling sequence; calculating the descent slope of the current sampling sequence based on sampling points within a preset time window after the pulse peak value; monitoring the recovery time when the pulse peak value in the current sampling sequence drops to a preset normal current value, and calculating the recovery time from the target occurrence time to the recovery time; when the absolute value of the descent slope is less than a preset slope threshold, and / or the recovery time is greater than a preset duration threshold, determining that the drive current is abnormal and generating an overcurrent protection trigger signal.

[0007] Secondly, this application provides an overcurrent protection device, comprising: a current acquisition circuit for real-time acquisition of drive current on a drive signal line and outputting a current sampling sequence; a peak detection circuit connected to the current acquisition circuit for detecting the pulse peak value and the target occurrence time corresponding to the pulse peak value in the current sampling sequence; a slope detection circuit connected to the peak detection circuit for detecting the falling slope of the current sampling sequence based on sampling points within a preset time window after the pulse peak value; and outputting a falling slope abnormal signal when the absolute value of the falling slope is less than a preset slope threshold; a recovery time detection circuit connected to the peak detection circuit for monitoring the recovery time when the pulse peak value in the current sampling sequence falls to a preset normal current value, calculating the recovery time from the target occurrence time to the recovery time, and outputting a recovery time abnormal signal when the recovery time is greater than a preset duration threshold; and a protection trigger circuit connected to the slope detection circuit and the recovery time detection circuit respectively, for generating an overcurrent protection trigger signal when the falling slope abnormal signal and / or the recovery time abnormal signal are received.

[0008] Thirdly, this application provides a display panel including a display area and a non-display area. The display area includes a plurality of pixel units arranged in an array, and the non-display area includes: a gate driving circuit connected to the plurality of pixel units for providing a scan signal; a source driving circuit connected to the plurality of pixel units for providing a data signal; and an overcurrent protection device connected to the drive signal line in the gate driving circuit and / or the source driving circuit for real-time monitoring of the drive current on the drive signal line and generating an overcurrent protection trigger signal when an abnormal drop slope and / or an abnormal recovery time is detected.

[0009] The technical solution provided in this application has at least the following beneficial effects:

[0010] (1) This application can accurately identify abnormal pulses with low peak values ​​but slow decline by detecting the decline slope of the pulse current. Compared with traditional overcurrent protection that relies on a single current threshold, it cannot be triggered when the pulse peak value does not exceed the threshold. However, in HSR mode, such slowly declining pulses will continuously generate Joule heat, leading to thermal damage to the polarizer. This application introduces the decline slope as an abnormality judgment condition, filling the blind spot of traditional protection in such abnormal scenarios and improving the accuracy of overcurrent protection.

[0011] (2) This application can effectively identify abnormal pulses with persistently high current after recovery by detecting the recovery time of the pulse current. In HSR mode, the time required for an abnormal pulse to recover to a normal level may be much longer than that for a normal pulse. Even if the peak value and the drop slope are not obviously abnormal, long-term heat accumulation will still burn out the polarizer. This application uses the recovery time as another abnormality judgment condition to directly quantify the duration of the abnormality, thus solving the problem that traditional protection cannot detect chronic heat accumulation.

[0012] (3) In this embodiment, the descent slope and recovery time are combined into a dual-dimensional protection mechanism, achieving comprehensive coverage of abnormal pulses. The two conditions are independent and complementary: protection is triggered as soon as any single condition is met, without waiting for both conditions to be met simultaneously, ensuring the speed of protection; at the same time, protection is not triggered when neither condition is met, avoiding false triggering caused by noise or normal fluctuations. Compared with the traditional single threshold protection, this dual-dimensional parallel judgment architecture improves the accuracy of anomaly identification and maintains the stability of overcurrent protection. Attached Figure Description

[0013] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0014] Figure 1 The diagram shown is a flowchart of an overcurrent protection method provided in an embodiment of this application.

[0015] Figure 2 As shown Figure 1 An exemplary process diagram of step S200.

[0016] Figure 3 As shown Figure 1 An exemplary process diagram of step S300.

[0017] Figure 4 The figure shown is a schematic diagram of a current curve provided in an embodiment of this application.

[0018] Figure 5 As shown Figure 1 An exemplary process diagram of step S400.

[0019] Figure 6 The diagram shown is a structural schematic of an overcurrent protection device provided in an embodiment of this application.

[0020] Figure 7The diagram shown is a circuit diagram of a current acquisition circuit provided in an embodiment of this application.

[0021] Figure 8 The diagram shown is a schematic diagram of a peak detection circuit provided in an embodiment of this application.

[0022] Explanation of reference numerals in the attached figures: 100. Overcurrent protection device; 110. Current acquisition circuit; 120. Peak detection circuit; 130. Slope detection circuit; 140. Recovery time detection circuit; 150. Protection trigger circuit; 111. Differential amplifier; 121. Digital processing unit; Rsense, sampling resistor; RG1, first current-limiting resistor; RG2, second current-limiting resistor; A, amplifier; Q, transistor; COMP, comparator; M1, first transistor; M2, second transistor; R1, first resistor; I1, first current source; I2, second current source. Detailed Implementation

[0023] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0024] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0025] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments described below can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present application, and should not be construed as limiting the present application.

[0026] This application provides an overcurrent protection method, specifically including the following embodiments: Figure 1 The diagram shown is a flowchart illustrating an overcurrent protection method provided in an embodiment of this application; as follows: Figure 1As shown, the overcurrent protection method of this embodiment is applied to a display panel, and is particularly suitable for liquid crystal display panels in high scan rate (HSR) mode, including the following steps: Step S100: Collect the real-time drive current on the drive signal line to obtain the current sampling sequence.

[0027] It should be noted that the drive signal lines in this embodiment include, but are not limited to, clock signal lines (CLK), latch signal lines (LC), start pulse signal lines (STV), and other transmission lines carrying drive current. In HSR mode, the drive frequency is significantly increased, and the drive current exhibits high-frequency pulse characteristics. For ease of analysis, the instantaneous current can be... The model is the sum of the normal driving current component and the pulse abnormal component, as shown in formula (1): (1) in, This represents the normal drive current component. This represents the pulse anomaly component caused by anomalies such as in-plane short circuits. For a single anomaly pulse, it can be approximated as an exponentially decaying form, as shown in formula (2): (2) Where A is the peak amplitude of the pulse, reflecting the severity of the abnormality; To restore the attenuation coefficient, the rate of pulse descent is determined; The peak occurrence time (i.e., the target occurrence time); u(t) is the unit step function, representing the pulse from... The moment begins. Under normal operating conditions, the abnormal pulse component... Approximately zero, attenuation coefficient The attenuation coefficient is relatively large, and the pulse fades quickly; however, when an abnormal short circuit occurs inside the panel, the attenuation coefficient decreases. The pulse current decreases significantly, the pulse current decreases slowly, and the recovery time is prolonged, leading to a sharp increase in the risk of heat accumulation.

[0028] This embodiment continuously acquires the real-time current on the drive signal line at a fixed sampling frequency to obtain a discrete numerical sequence of the drive current changing over time, denoted as the current sampling sequence. The sampling sequence reflects the actual waveform of the drive current on the time axis, including the normal drive current component and any possible abnormal pulse current components. The sampling frequency needs to be high enough (e.g., above 1MHz) to capture the rapidly changing transient characteristics of the current in HSR mode.

[0029] Step S200: Obtain the peak value of the pulse in the current sampling sequence and the target occurrence time corresponding to the peak value.

[0030] It should be noted that a pulse peak refers to a local maximum value formed after a rapid increase in the driving current within a short period of time, usually corresponding to fault events such as in-plane abnormal short circuits. In this embodiment, the pulse peak value is identified from the sampling sequence obtained in step S100, and the specific time when the peak value occurs (i.e., the target occurrence time) is determined. Specifically, the identification method can be: traversing the sampling sequence, finding the extreme point where the current value first rises and then falls in the local neighborhood, and recording the time of this extreme point. For cases where multiple local maxima may exist in the sampling sequence, the most significant pulse peak value can be selected based on its amplitude or waveform characteristics. The accuracy of the target occurrence time directly affects the accuracy of the subsequent recovery time calculation. Preferably, the time accuracy can be improved to below the sampling period through interpolation or other methods.

[0031] Step S300: Calculate the descent slope of the current sampling sequence based on the sampling points within the preset time window after the pulse peak.

[0032] It should be noted that the descent slope is used to quantify how quickly the pulse current decreases from its peak value. In this embodiment, a preset time window (e.g., 10 microseconds) is extracted from the target occurrence time determined in step S200. Within this window, the current value at the beginning of the window (i.e., the peak current) and the current value at the end of the window are taken, and the current difference is calculated and divided by the time difference to obtain the average descent slope. Since the current decreases after the peak value, this slope is negative. The larger the absolute value of the descent slope, the faster the current decreases; the smaller the absolute value, the slower the current decreases, meaning that the abnormal current continues to inject heat into the panel, increasing the risk of polarizer burn-out.

[0033] Step S400: Monitor the recovery time when the pulse peak value in the current sampling sequence drops to the preset normal current value, and calculate the recovery time from the time the target occurred to the recovery time.

[0034] It should be noted that the preset normal current value refers to the normal current level of the drive signal line under abnormal conditions, such as 50% of the rated current or obtained through filtering historical data; the recovery time reflects the time required for the abnormal pulse to recover from its peak to the normal level. The longer the recovery time, the longer the duration of the abnormal current and the more significant the heat accumulation effect.

[0035] Step S500: When the absolute value of the descent slope is less than the preset slope threshold and / or the recovery time is greater than the preset time threshold, it is determined that there is an abnormality in the drive current and an overcurrent protection trigger signal is generated.

[0036] It should be noted that the preset slope threshold is a negative value, for example, -5mA / μs. When the absolute value of the actual descent slope is less than this preset slope threshold (i.e., the descent is slower), it indicates an abnormal current recovery. The preset duration threshold (e.g., 25 microseconds) can be dynamically adjusted according to the refresh rate. When the actual recovery time exceeds this threshold, it indicates that the abnormal duration is too long. When either the abnormal descent slope or the abnormal recovery time is met, or both conditions are met simultaneously, it is determined that there is an abnormality in the current drive current, and an overcurrent protection trigger signal is immediately generated. The overcurrent protection trigger signal can be used for protective actions such as shutting down the drive output, reducing the refresh rate, or triggering an alarm.

[0037] Furthermore, the above modeling formula (2) reveals the relationship between the descent slope and recovery time and the decay coefficient. The correlation is: the absolute value of the descending slope is proportional to... ×A, recovery time is inversely proportional to Therefore, when As the slope decreases, the absolute value of the descent rate decreases (the descent is slower), and the recovery time becomes longer. This is the physical basis for selecting the descent rate and recovery time as the core parameters for anomaly detection in this application. However, in actual circuit implementation, it is not necessary to explicitly calculate parameters such as A and α; the anomaly risk can be accurately assessed simply by directly measuring the descent rate and recovery time.

[0038] In summary, this application achieves the following beneficial effects by acquiring the drive current in real time and extracting the pulse peak value, calculating the descent slope and recovery time as two independent features, and employing triggering logic for abnormal slope or recovery time: (1) This application can accurately identify abnormal pulses with low peak values ​​but slow decline by detecting the decline slope of the pulse current. Compared with traditional overcurrent protection that relies on a single current threshold, it cannot be triggered when the pulse peak value does not exceed the threshold. However, in HSR mode, such slowly declining pulses will continuously generate Joule heat, leading to thermal damage to the polarizer. This application introduces the decline slope as an abnormality judgment condition, filling the blind spot of traditional protection in such abnormal scenarios and improving the accuracy of overcurrent protection.

[0039] (2) This application can effectively identify abnormal pulses with persistently high current after recovery by detecting the recovery time of the pulse current. In HSR mode, the time required for an abnormal pulse to recover to a normal level may be much longer than that for a normal pulse. Even if the peak value and the drop slope are not obviously abnormal, long-term heat accumulation will still burn out the polarizer. This application uses the recovery time as another abnormality judgment condition to directly quantify the duration of the abnormality, thus solving the problem that traditional protection cannot detect chronic heat accumulation.

[0040] (3) In this embodiment, the descent slope and recovery time are combined into a dual-dimensional protection mechanism, achieving comprehensive coverage of abnormal pulses. The two conditions are independent and complementary: protection is triggered as soon as any single condition is met, without waiting for both conditions to be met simultaneously, ensuring the speed of protection; at the same time, protection is not triggered when neither condition is met, avoiding false triggering caused by noise or normal fluctuations. Compared with the traditional single threshold protection, this dual-dimensional parallel judgment architecture improves the accuracy of anomaly identification and maintains the stability of overcurrent protection.

[0041] Therefore, this application improves the detection accuracy of pulse current in high scan rate mode by using a collaborative working mechanism of descent slope detection and recovery time detection, avoiding the problem of damage to the polarizer due to abnormal pulse current being continuously too high, thereby ensuring the safety and reliability of the display panel.

[0042] Figure 2 As shown Figure 1 An exemplary flowchart of step S200; as shown Figure 2 As shown, obtaining the pulse peak value and the corresponding target occurrence time in the current sampling sequence includes the following steps: Step S210: Compare the current value of each sampling point in the current sampling sequence with the peak identification threshold to obtain at least one candidate peak point whose current value exceeds the peak identification threshold.

[0043] It should be noted that, since there is always a normal drive current component I in the drive current, base (t), whose amplitude is usually lower than the peak amplitude of the abnormal pulse. In order to exclude normal fluctuations and improve detection efficiency, this embodiment sets a peak identification threshold Ith, and only sampling points with current values ​​exceeding the threshold are included in the candidate range. For example, if the peak value of the normal drive current is 10A, then Ith can be set to 15A. When the current value of a sampling point in the sampling sequence is greater than 15A, the point is marked as a candidate peak point; otherwise, points with a current value lower than 15A are directly ignored and no further complex trend verification is performed. This can greatly reduce the amount of calculation, avoid unnecessary judgment of normal current waveforms, and ensure that no real abnormal pulse peaks are missed. The peak identification threshold can be pre-calibrated according to parameters such as panel specifications and refresh rate, or it can be dynamically adjusted to adapt to different operating conditions.

[0044] Step S220: For each candidate peak point, if the current values ​​of the P consecutive sampling points in the forward neighborhood of the current candidate peak point show a monotonically increasing trend, and the current values ​​of the Q consecutive sampling points in the backward neighborhood of the current candidate peak point show a monotonically decreasing trend, then the current candidate peak point is confirmed as a valid peak point.

[0045] It should be noted that simply exceeding the threshold value is not sufficient to confirm that the point is the true pulse peak, as noise or instantaneous fluctuations may also cause individual sampling points to exceed the threshold. This step verifies the peak characteristics by analyzing the monotonicity of the neighborhoods before and after the candidate peak point. Specifically: for a candidate peak point tc, its forward neighborhood (i.e., the P consecutive sampling points before tc, for example, P=5) and backward neighborhood (i.e., the Q consecutive sampling points after tc, for example, Q=5) are taken, and the current value change trend of the sampling points in these two neighborhoods is examined respectively: (1) P consecutive sampling points in the forward neighborhood: Required This means that the current value shows a monotonically increasing trend, that is, it increases sequentially from far to near.

[0046] (2) Q consecutive sampling points in the backward neighborhood: Required This means that the current value shows a monotonically decreasing trend, that is, it decreases from near to far.

[0047] A candidate peak point is considered a valid peak point only if both of the above monotonic conditions are met simultaneously. Otherwise, it is considered noise or a non-peak extreme point and is discarded.

[0048] For example, suppose the sampling sequence is: ..., 12, 14, 16, 18, 17, 15, 13, ... The candidate peak point is located at current value 18. The forward neighborhood (12→14→16→18) is monotonically increasing, and the backward neighborhood (18→17→15→13) is monotonically decreasing. Therefore, this point is confirmed as a valid peak point. The method in this embodiment can strictly distinguish between true pulse peaks and signal glitches, plateau regions, or local extrema of oscillating waveforms, improving the accuracy of peak detection and providing reliable data support for subsequent slope and recovery time calculations.

[0049] Step S230: When multiple valid peak points are detected, select the valid peak point with the largest current value as the pulse peak point.

[0050] It should be noted that in HSR mode, due to the high-frequency characteristics of the drive signal and the possibility of multiple reflections or oscillations, an abnormal event may result in multiple adjacent valid peak points in the sampling sequence (e.g., a main peak followed by a smaller secondary peak). These peak points may all satisfy the monotonic trend verification, but usually only the main peak with the largest amplitude reflects the most severe abnormal state, and the subsequent descent slope and recovery time should be calculated based on the main peak. Therefore, in this step, the pulse peak with the largest current value is selected from the multiple detected valid peak points as the final pulse peak used for overcurrent protection. If multiple peaks with the same amplitude and close differences exist, the point with the middle time or the first point to appear can be selected. By performing deduplication, the problem of repeated triggering or inconsistent judgment benchmarks caused by secondary peak interference is avoided.

[0051] For example, if three valid peak points are detected within a 10μs time window, with current values ​​of 20A (main peak), 15A (secondary peak), and 12A (secondary peak), then the sampling point corresponding to 20A is selected as the pulse peak value.

[0052] Step S240: Based on the sampling point corresponding to the pulse peak and its adjacent sampling points before and after it, calculate the vertex time of the parabola through curve fitting, and take the vertex time as the target occurrence time.

[0053] It should be noted that, since the sampling is discrete, the actual peak current time may fall between two sampling points, rather than directly on the sampling point. Directly using the sampling point's time as the peak time can lead to an error of up to half a sampling period, thus affecting the accuracy of the recovery time calculation. Therefore, this step uses parabolic fitting to estimate a more accurate peak time. The specific steps are as follows: (1) Let the sampling point corresponding to the pulse peak be ( , ), its previous sampling point is ( , The next sampling point is ( , ),in = Δt, = +Δt, where Δt is the sampling period.

[0054] (2) Assume that the current waveform near the pulse peak can be approximated by a quadratic function: (3) (3) Substituting the coordinates of the three points into formula (3), the coefficients a, b, and c can be solved. Taking the derivative of the quadratic function and setting it to zero: (4) (4) It can be obtained through algebraic operations. (5) Formula (5) calculates This is the vertex time of the fitted parabola, and this vertex time is taken as the target occurrence time tp.

[0055] This embodiment improves the positioning accuracy of the peak moment from the sampling period level to the sub-sampling level by using parabolic fitting, thereby ensuring high accuracy in the recovery time calculation and making the overcurrent protection criterion more reliable.

[0056] Figure 3 As shown Figure 1 An exemplary process diagram of step S300; as shown Figure 3As shown, according to the sampling points within a preset time window after the pulse peak, calculate the falling slope of the current sampling sequence, which specifically includes the following steps: Step S310: Take the sampling point corresponding to the pulse peak as the starting sampling point, and intercept multiple sampling points within the preset time window backward to determine the ending sampling point of the preset time window.

[0057] Step S320: Obtain the current difference between the starting current value corresponding to the starting sampling point and the ending current value corresponding to the ending sampling point, as well as the time difference between the starting sampling point and the ending sampling point.

[0058] Step S330: Obtain the falling slope of the current sampling sequence according to the ratio of the current difference to the time difference.

[0059] It should be noted that after locating the pulse peak and its target occurrence time tp through step S200 in this embodiment, it is necessary to further quantify the speed at which the pulse descends from the peak, that is, calculate the falling slope. Specifically: (1) Selection of the preset time window: As Figure 4 shown, take the sampling point corresponding to the pulse peak as the starting sampling point, and intercept a preset time window backward. The window length is denoted as Δt. Typically, Δt can be set to several microseconds to dozens of microseconds, specifically depending on the pulse width and sampling frequency in the HSR mode. The ending sampling point of the window is the sampling point corresponding to the time after Δt from the starting point, and its time is denoted as tp + Δt, and the current value is denoted as I(tp + Δt).

[0060] (2) Calculation of the falling slope: The calculation formula for the average falling slope S is: (6) In formula (6), represents the starting current value (i.e., the pulse peak current), represents the ending current value; Δt is the time difference between the starting sampling point and the ending sampling point.

[0061] Since the pulse current shows a downward trend after the peak, usually I(tp + Δt) < I(tp), so S is negative. For example, if I(tp) = 20A and I(tp + 10μs) = 10A, then S = (10 20)A / 10μs = 1A / μs.

[0062] In this embodiment, the absolute value |S| of the falling slope reflects the rate of current decrease. The larger |S| is, the faster the current decreases, the shorter the pulse duration, and the lower the risk of heat accumulation; on the contrary, the smaller |S| is, the slower the current decreases, the pulse maintains a high current level for a long time, continuously generates heat, and is extremely likely to cause thermal damage to the polarizer.

[0063] Figure 5 As shown Figure 1 An exemplary process diagram of step S400; as shown Figure 5 As shown, the descent slope of the current sampling sequence is calculated based on the sampling points within a preset time window after the pulse peak. This includes the following steps: Step S410: Starting from the time when the target occurs corresponding to the pulse peak, traverse the subsequent sampling points in chronological order.

[0064] Step S420: Compare the current value of each sampling point with the preset normal current value. When the current values ​​of multiple consecutive sampling points are all less than or equal to the preset normal current value for the first time, take the time corresponding to the first sampling point as the recovery time.

[0065] Step S430: Calculate the time difference between the recovery time and the target occurrence time to obtain the recovery duration.

[0066] It should be noted that after locating the peak pulse moment in step S200, it is necessary to further determine the duration of the abnormal pulse's decline from the peak and its eventual return to normal levels, i.e., the recovery time. A longer recovery time indicates that the abnormal current continues to inject heat into the panel, and the risk of heat accumulation is higher. Specifically: (1) Preset normal current value: such as Figure 4 As shown, the normal current level I norm This represents the typical current value of the drive signal line under normal conditions. I norm It can be a preset fixed constant (e.g., 50% of the rated current), or it can be dynamically updated based on historical data (e.g., the background current after moving average filtering). This step compares the current value at each sampling point with I... norm The current is compared to determine whether it has returned to the normal range.

[0067] (2) Logic for determining the recovery time: Due to sampling noise or instantaneous fluctuations, the current value may be temporarily lower than I. norm Then it rises again, if only a single sampling point is below I norm The process of determining recovery is highly susceptible to false triggering. Therefore, this step introduces a condition for determining multiple consecutive sampling points: only when the current values ​​of the first M consecutive sampling points (M≥2, e.g., M=3) are all less than or equal to I... norm Only when the driving current has truly returned to normal is the time taken as the recovery time tr, and the time corresponding to the first sampling point among these M consecutive sampling points is taken as the recovery time tr.

[0068] (3) Calculation of recovery time: The recovery time Trec is obtained by calculating the time difference between the recovery time and the target occurrence time.

[0069] In one embodiment, the overcurrent protection method provided in this application further includes the following steps: calculating the difference between the current value of each sampling point and the preset normal current value based on all sampling points from the time of the target occurrence to the time of recovery, and squaring the difference to obtain the heat contribution value of each sampling point; obtaining the equivalent heat integral quantity corresponding to the pulse peak based on all heat contribution values; and determining that there is an abnormal heat accumulation in the driving current and generating an overcurrent protection trigger signal when the equivalent heat integral quantity is greater than the thermal safety threshold.

[0070] It should be noted that this embodiment further introduces the equivalent heat integral quantity as an independent or supplementary criterion for anomaly determination. That is to say, even if the descent slope and recovery time do not trigger overcurrent protection, if the heat integral quantity exceeds the standard, an anomaly is still determined and protection is triggered. Specifically: To assess the additional heat generated by abnormal pulses exceeding normal current levels, the preset normal current value is subtracted from the current value I(t) at each sampling point. The current exceeding the normal range is obtained as ΔI(t) = I(t). Then, by squaring ΔI(t) and integrating over time (or discretely accumulating), the equivalent heat integral can be obtained. The specific formula is as follows: (7) Where tp is the time of target occurrence (peak time), and tr is the recovery time. The physical meaning of the equivalent heat integral is: during the duration of the abnormal pulse, the Joule heat contributed by the portion exceeding the normal current is proportional to the actual risk of thermal damage to the polarizer.

[0071] The application scenarios of the equivalent heat integral quantity in this embodiment include: (1) Scenario 1: When the protection is not triggered by the descent slope and recovery time, but the heat integral quantity exceeds the standard, a supplementary trigger is performed to avoid missed judgment. (2) Scenario 2: When the protection is triggered by the descent slope or recovery time, but the heat integral quantity can be used as a quantitative indicator of the severity of the fault for graded protection.

[0072] In another embodiment, determining that the drive current is abnormal and generating an overcurrent protection trigger signal includes: obtaining a first ratio of the absolute value of the falling slope to a preset slope threshold, a second ratio of the recovery time to a preset duration threshold, and a third ratio of the equivalent heat integral to a thermal safety threshold; adding the first product of the first ratio and the first weighting coefficient, the second product of the second ratio and the second weighting coefficient, and the third product of the third ratio and the third weighting coefficient to obtain a comprehensive risk value of the drive current; wherein the sum of the first weighting coefficient, the second weighting coefficient, and the third weighting coefficient is 1; when the comprehensive risk value is greater than 1, determining that the drive current is abnormal and generating an overcurrent protection trigger signal.

[0073] It should be noted that this embodiment weights and fuses three dimensions of indicators: the degree of abnormality in descent slope, the degree of abnormality in recovery time, and the degree of abnormality in heat accumulation, to construct a comprehensive risk value. This value is used to more comprehensively and flexibly assess the overall risk of abnormal pulses, specifically including: (1) Define the ratio: Let |S| be the absolute value of the actual descent slope and Sth be the preset slope threshold. Then the first ratio r1 = |S| / Sth. When r1 < 1, the absolute value of the descent slope is less than the threshold, that is, the descent is slow (abnormal); when r1 > 1, the absolute value of the descent slope is greater than the threshold, that is, the descent is fast (normal).

[0074] Trec is the actual recovery time, and Tth is the preset time threshold. The second ratio r2 = Trec / Tth. When r2 < 1, the recovery time is less than the threshold (normal); when r2 > 1, the recovery time is greater than the threshold (abnormal).

[0075] E pulse Given the equivalent heat integral and Eth as the thermal safety threshold, the third ratio r3 = E pulse / Eth; When r3<1, the heat integral is less than the thermal safety threshold (normal); when r3>1, the heat integral is greater than the threshold (abnormal).

[0076] (2) Weighted summation: The three ratios reflect the relative degree of anomaly of different physical quantities, but their contributions to the final thermal damage may be different. For example, in high refresh rate mode, the impact of recovery time may be more significant than the drop slope; under specific panel heat dissipation conditions, the weight of heat integral can be increased; therefore, this embodiment introduces a first weight coefficient w1, a second weight coefficient w2 and a third weight coefficient w3, and satisfies w1+w2+w3=1 to support flexible configuration under different application scenarios.

[0077] The calculation method for the comprehensive risk value is shown in formula (8): R = w1 × r1 + w2 × r2 + w3 × r3 (8) The weighting coefficients can be pre-calibrated or dynamically adjusted according to real-time operating conditions (such as refresh rate and temperature).

[0078] (3) Abnormal judgment: When R>1, the driving current is judged to be abnormal and protection is triggered; the threshold is set to 1 to indicate that the combined contribution of the three dimensions exceeds the safety boundary of a single dimension. That is to say, if each ratio does not exceed 1 individually, the weighted sum will not exceed 1, and the abnormal protection will not be triggered at this time; if a certain ratio is slightly higher than 1 while others are normal, the weighted sum will be greater than 1, and protection will be triggered, thereby improving the ability to identify complex abnormal patterns and avoiding missed judgments or misjudgments of single indicators.

[0079] In another embodiment, the overcurrent protection method further includes: when the absolute value of the falling slope is greater than or equal to a preset slope threshold, the recovery time is less than or equal to a preset time threshold, the equivalent heat integral is less than or equal to a thermal safety threshold, and the comprehensive risk value is less than or equal to 1, acquiring a historical sampling sequence within the cumulative time; based on multiple pulse peaks in the historical sampling sequence, accumulating the equivalent heat integral of each pulse peak to obtain the cumulative heat integral; when the cumulative heat integral is greater than the total thermal safety threshold, determining that the drive current is abnormal and generating an overcurrent protection trigger signal.

[0080] It should be noted that in certain fault scenarios, the descent slope, recovery time, heat integral amount, and comprehensive risk value of a single pulse do not exceed their respective thresholds (i.e., the single pulse is "normal"), but multiple such sub-abnormal pulses occur consecutively within a short period of time, and their accumulated heat may still exceed the thermal tolerance of the polarizer. Therefore, this embodiment sets an accumulation time window to accumulate the equivalent heat integral amount of multiple pulses within the window. When the accumulated heat integral amount exceeds the total thermal safety threshold, it is determined to be a systemic anomaly and protection is triggered, specifically including: (1) Preconditions: The execution of this embodiment has a clear precondition, namely, that none of the four indicators of the current pulse have triggered protection, i.e.: ① The absolute value of the descent slope is greater than or equal to the preset slope threshold (the descent is fast enough, which is normal); ②Recovery time ≤ preset time threshold (Fast recovery is normal); ③ Equivalent heat integral ≤ thermal safety threshold (single pulse heat does not exceed the limit); ④ The overall risk value is ≤ 1 (not triggered after weighted fusion).

[0081] Only when all the above conditions are met will the system consider the current pulse insufficient to trigger protection and enter the multi-pulse accumulation judgment. If any condition is not met (i.e., the single pulse is abnormal), the protection has been directly triggered without entering the accumulation process, thus avoiding repeated triggering of leakage protection.

[0082] (2) Cumulative duration and historical sampling sequence: The cumulative duration Tw is a preset time window length (e.g., 100ms, 1s, etc.), which is completely different from the preset time window (microsecond level) used to calculate the descent slope in step S300 above; the cumulative duration is used to capture the long-term statistical characteristics of multiple pulses. The historical sampling sequence refers to all the sampling data recorded within the cumulative duration Tw time period from the current moment (which may include multiple pulse peaks and their corresponding equivalent heat integrals).

[0083] The formula for calculating the cumulative heat integral in this embodiment is: = (9) Where N is the total number of pulse peaks detected within the cumulative duration Tw. Let be the equivalent heat integral of the peak value of the i-th pulse. The heat integral of each pulse is calculated independently and then summed to obtain the cumulative heat integral. .

[0084] (3) Total thermal safety threshold: Total thermal safety threshold This is a system-defined upper limit, representing the maximum total heat allowed over the accumulated time. It can be calibrated based on the polarizer's heat capacity, heat dissipation rate, and operating environment. When the accumulated heat... > This indicates that although the heat generated by a single pulse is not large, the combined heat generated by multiple pulses is sufficient to cause thermal damage, thus indicating a systemic anomaly and triggering protection.

[0085] In summary, this embodiment, by introducing a multi-pulse cumulative heat integration mechanism, achieves a comprehensive assessment of thermal damage risk, thereby enhancing the safety and reliability of the display panel in HSR mode.

[0086] This application provides an overcurrent protection device, specifically including the following embodiments: Figure 6 The diagram shown is a structural schematic of an overcurrent protection device provided in an embodiment of this application; as shown Figure 6 As shown, the overcurrent protection device 100 includes a current acquisition circuit 110, a peak detection circuit 120, a slope detection circuit 130, a recovery time detection circuit 140, and a protection trigger circuit 150; each circuit is connected sequentially or interconnected as needed to form a complete processing link from analog current signal acquisition to digital protection signal output. Specifically: (1) Current acquisition circuit 110 is used to acquire the drive current on the drive signal line in real time and output the current sampling sequence. For example Figure 7 As shown, the basic structure of the current acquisition circuit includes at least a sampling resistor Rsense and a differential amplifier 111. The circuit connection is as follows: VDD – Load (Display Driver Load) – Sampling resistor Rsense – GND; whereby a voltage signal is generated across the sampling resistor Rsense and input to the differential amplifier 111 for amplification.

[0087] When the driving current Iload flows through the sampling resistor Rsense, according to Ohm's law, a voltage drop is generated across the sampling resistor: Vsense = Iload × Rsense; in order to facilitate subsequent circuit detection, the sampling signal needs to be amplified.

[0088] The voltages across the sampling resistor are: Vsense1 (the voltage across the upper end of the sampling resistor) and Vsense2 (the voltage across the lower end of the sampling resistor); the operational amplifier output is: Vout = Av(Vsense1) Vsense2); where: Av is the amplifier gain, typically designed to be 20 to 100 times, therefore the output voltage becomes: = This voltage signal accurately reflects the magnitude of the drive current. The differential amplifier includes a first current-limiting resistor RG1, a second current-limiting resistor RG2, amplifier A, transistor Q, a current mirror, and a buffer. Since the drive current may contain high-frequency switching noise transient spikes, an RC low-pass filter circuit is typically added to the amplifier output; this filter circuit is used to suppress high-frequency noise and improve detection stability. The current sampling module ultimately outputs a signal, Vsample, which is input to subsequent circuits for further analysis of current change characteristics.

[0089] (2) Peak detection circuit 120, connected to current acquisition circuit, is used to detect the peak value of the pulse in the current sampling sequence and the time of occurrence of the target corresponding to the peak value.

[0090] like Figure 8As shown, the peak detection circuit in this embodiment includes two parts: an analog comparison unit and a digital processing unit 121. The analog comparison unit consists of a comparator COMP, a first transistor M1, a second transistor M2, a first resistor R1, a first current source I1, and a second current source I2. The non-inverting input of the comparator COMP receives the sampled voltage from the current acquisition circuit, and the inverting input is connected to the peak identification threshold voltage through the first resistor. The output of the comparator COMP is connected to the control terminals of the first transistor M1 and the second transistor M2, and the turn-on voltages of the first transistor and the second transistor are opposite (i.e., one is N-type and the other is P-type), forming a positive feedback loop. When the sampled voltage exceeds the threshold, the comparator outputs a high level, the first transistor is turned on, and the second transistor is turned off. The inverting input of the comparator is pulled low through the first current source, thereby reducing the actual comparison threshold of the comparator. When the sampled voltage falls back to below the reduced threshold, the comparator outputs a low level, the second transistor is turned on, and the first transistor is turned off. The inverting input of the comparator is pulled high through the second current source, restoring the original threshold. This hysteresis characteristic eliminates the jitter of the input signal near the threshold, realizes pulse shaping, and outputs a clean digital pulse signal, with each pulse corresponding to a candidate peak point.

[0091] Furthermore, the digital processing unit is connected to the output of the comparator, receives pulse signals from multiple candidate peak points, and performs the following operations: for each candidate peak point, it extracts the sampling point sequence in its immediate and next neighborhoods, verifies whether the forward sequence is monotonically increasing and the backward sequence is monotonically decreasing, and only when both monotonic conditions are met simultaneously is it confirmed as a valid peak point; when there are multiple valid peak points, the one with the largest current value is selected as the final pulse peak; then, using the sampling point corresponding to this peak point and its immediate and next neighboring sampling points, the vertex time of the parabola is calculated using the parabolic fitting method, which is taken as the precise target occurrence time.

[0092] (3) Slope detection circuit 130 is connected to peak detection circuit 120 and is used to detect the falling slope of the current sampling sequence based on the sampling points within the preset time window after the pulse peak; and outputs a falling slope abnormal signal when the absolute value of the falling slope is less than the preset slope threshold.

[0093] It should be noted that the slope detection circuit in this embodiment includes a sampling buffer unit, a window control unit, a difference calculation unit, a time base unit, a divider, and a threshold register, specifically: ① Connection Relationship: The sampling buffer unit is connected to the output of the current acquisition circuit to buffer the sampling sequence within a preset time window, storing at least the sampling point corresponding to the pulse peak and the sampling points within the subsequent window. The window control unit is connected to the target occurrence time signal output by the peak detection circuit to start window timing at the peak moment, determining the starting sampling point (i.e., the peak point) and the ending sampling point (the sampling point after the window duration Δt). The difference calculation unit obtains the starting current value and the ending current value from the sampling buffer unit, calculates the difference between the two, and outputs the current difference. The time reference unit provides the duration Δt of the preset time window (e.g., 5μs) and outputs the time difference. The divider receives the current difference and the duration Δt, and calculates the falling slope S=(Iend The value is calculated as Ipeak / Δt and compared with a preset slope threshold Sth. Since the descending slope is negative, the absolute value or the numerical value is directly compared during the actual comparison. The threshold register is used to store the preset slope threshold (negative value) and can be configured through an external interface.

[0094] ②Working Principle: When the peak detection circuit outputs the target occurrence time signal, the window control unit starts timing and locks the sampling point (starting point) corresponding to the pulse peak. After a preset time window Δt, the window control unit reads the current value at the end sampling point. The difference calculation unit calculates ΔI = Iend. Ipeak, the divider calculates the descent slope S=ΔI / Δt; compares S with the preset slope threshold Sth: if S>Sth, that is, the absolute value of the descent slope is less than the threshold, it indicates that the current descent is too slow, and outputs an abnormal descent slope signal, which is sent to the protection trigger circuit.

[0095] (4) Recovery time detection circuit 140 is connected to peak detection circuit 120. It is used to monitor the recovery time when the pulse peak value in the current sampling sequence drops to the preset normal current value, calculate the recovery time from the target occurrence time to the recovery time, and output a recovery time abnormal signal when the recovery time is greater than the preset time threshold.

[0096] It should be noted that the recovery time detection circuit in this embodiment includes: a comparator array, a continuous counting unit, a timer, a threshold register, and state control logic. Specifically: ① Connection Relationship: The comparator array includes at least one comparator. Its non-inverting input receives the current value (or corresponding sampling voltage) of the current sampling point, and its inverting input is connected to the reference voltage Vnorm corresponding to the preset normal current value Inorm. This is used to compare in real time whether the sampled current is less than or equal to the normal current level. A continuous counting unit is connected to the output of the comparator to count the number of sampling points that continuously satisfy "current ≤ Inorm", and a continuous count threshold MM (e.g., M=3) is set. When the count reaches M, a recovery confirmation signal is output. The timer is connected to the target occurrence time signal of the peak detection circuit. It starts timing from this time and stops timing when the recovery confirmation signal is received, outputting the timing result as the recovery duration Trec. The threshold register is used to store the preset duration threshold Tth, which can be dynamically configured according to the refresh frequency. The comparator compares the recovery duration output by the timer with Tth. When Trec>Tth, a recovery time abnormality signal is output.

[0097] ②Working principle: When the peak detection circuit outputs the target occurrence time tp, the timer starts counting from zero, and at the same time, the comparator starts monitoring the sampling current and I. norm The relationship. For each sampling point, if the current value ≤ I norm The continuous counting unit increments by 1; if the current value > I norm The counter is reset to zero. Only when the continuous count reaches the preset value M is the system considered to have truly returned to normal, and a recovery confirmation signal is output. This design effectively avoids false recovery judgments caused by instantaneous noise or fluctuations at a single sampling point. The timer stops counting immediately upon receiving the recovery confirmation signal, and the output time value is the recovery duration Trec. The duration comparator compares Trec with Tth; if it exceeds the threshold, it outputs a recovery time abnormality signal. This signal is sent to the protection trigger circuit.

[0098] (5) Protection trigger circuit 150 is connected to slope detection circuit 130 and recovery time detection circuit 140 respectively, and is used to generate overcurrent protection trigger signal when receiving abnormal falling slope signal and / or abnormal recovery time signal.

[0099] It should be noted that the protection trigger circuit in this embodiment includes: logic gate units, latches, and output driver stages. Specifically: ① Connection Relationship: The logic gate unit contains at least one OR gate, whose two inputs are connected to the falling slope abnormal signal of the slope detection circuit and the recovery time abnormal signal of the recovery time detection circuit, respectively. The latch is connected to the output of the OR gate to maintain the triggered state and prevent protection cancellation due to the temporary disappearance of the abnormality. Output Driver Stage: Converts the output of the latch into a level signal sufficient to drive the external protection actuator (such as the drive shutdown signal).

[0100] ②Working Principle: When the slope detection circuit outputs an abnormal falling slope signal (active high), or the recovery time detection circuit outputs an abnormal recovery time signal (active high), the OR gate outputs a high level, triggering the latch to set. The output driver stage immediately generates an overcurrent protection trigger signal. This signal can be transmitted to the system controller to execute protective actions such as shutting down the driver output, reducing the refresh rate, or cutting off the power supply. The latch can be cleared by the system reset signal so that it can resume normal operation after the fault is cleared.

[0101] In summary, the overcurrent protection device provided in this application simultaneously monitors two independent features, the descent slope and the recovery time. Any one of these abnormalities can trigger protection, which not only makes up for the blind spot of traditional single threshold protection and improves the detection accuracy of pulse current in high scan rate mode, but also avoids the problem of damage to the polarizer due to the continuous high abnormal pulse current, thereby ensuring the safety and reliability of the display panel.

[0102] In one embodiment, this application provides a display panel including a display area and a non-display area. The display area includes a plurality of pixel units arranged in an array, and the non-display area includes: The gate driving circuit, connected to multiple pixel units, is used to provide scanning signals; The source drive circuit, connected to multiple pixel units, is used to provide data signals; The overcurrent protection device shown in the above embodiment is connected to the drive signal line in the gate drive circuit and / or source drive circuit, and is used to monitor the drive current on the drive signal line in real time, and generate an overcurrent protection trigger signal when an abnormal falling slope and / or abnormal recovery time are detected.

[0103] Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0104] In the description of this specification, references to terms such as "some embodiments," "exemplarily," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0105] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application. Therefore, any changes or modifications made in accordance with the claims and description of this application should fall within the scope of this patent application.

Claims

1. An overcurrent protection method, characterized by, The overcurrent protection method includes: The real-time drive current on the drive signal line is collected to obtain the current sampling sequence; Obtain the peak value of the pulse in the current sampling sequence and the target occurrence time corresponding to the peak value; The descent slope of the current sampling sequence is calculated based on the sampling points within a preset time window after the pulse peak. Monitor the recovery time when the pulse peak value in the current sampling sequence drops to a preset normal current value, and calculate the recovery time from the time the target occurred to the recovery time; When the absolute value of the descent slope is less than a preset slope threshold, and / or the recovery time is greater than a preset time threshold, it is determined that the drive current is abnormal and an overcurrent protection trigger signal is generated. Based on all sampling points from the time of the target occurrence to the time of recovery, calculate the difference between the current value of each sampling point and the preset normal current value, and square the difference to obtain the heat contribution value of each sampling point. Based on all heat contribution values, the equivalent heat integral corresponding to the pulse peak value is obtained; When the equivalent heat integral is greater than the thermal safety threshold, obtain the first ratio of the absolute value of the descent slope to the preset slope threshold, the second ratio of the recovery time to the preset time threshold, and the third ratio of the equivalent heat integral to the thermal safety threshold. The comprehensive risk value of the drive current is obtained by adding the first product of the first ratio and the first weighting coefficient, the second product of the second ratio and the second weighting coefficient, and the third product of the third ratio and the third weighting coefficient; wherein the sum of the first weighting coefficient, the second weighting coefficient, and the third weighting coefficient is 1. When the overall risk value is greater than 1, it is determined that the drive current is abnormal and the overcurrent protection trigger signal is generated.

2. The overcurrent protection method of claim 1, wherein, Obtaining the peak value of the pulse in the current sampling sequence and the target occurrence time corresponding to the peak value includes: The current value of each sampling point in the current sampling sequence is compared with the peak identification threshold to obtain at least one candidate peak point whose current value exceeds the peak identification threshold; For each candidate peak point, if the current values ​​of the P consecutive sampling points in the forward neighborhood of the current candidate peak point show a monotonically increasing trend, and the current values ​​of the Q consecutive sampling points in the backward neighborhood of the current candidate peak point show a monotonically decreasing trend, then the current candidate peak point is confirmed as a valid peak point. When multiple valid peak points are detected, the valid peak point with the largest current value is selected as the pulse peak value; Based on the sampling point corresponding to the pulse peak and its adjacent sampling points, the vertex time of the parabola is calculated by curve fitting, and the vertex time is taken as the occurrence time of the target.

3. The overcurrent protection method of claim 1, wherein, Based on the sampling points within a preset time window following the pulse peak, the descent slope of the current sampling sequence is calculated, including: Taking the sampling point corresponding to the pulse peak as the starting sampling point, multiple sampling points within a preset time window are extracted to determine the ending sampling point of the preset time window; Obtain the current difference between the starting current value corresponding to the starting sampling point and the ending current value corresponding to the ending sampling point, as well as the time difference between the starting sampling point and the ending sampling point; The descent slope of the current sampling sequence is obtained based on the ratio of the current difference to the time difference.

4. The overcurrent protection method of claim 1, wherein, The monitoring of the recovery time when the pulse peak value in the current sampling sequence drops to a preset normal current value, and the calculation of the recovery time from the target occurrence time to the recovery time, include: Starting from the time when the target occurs corresponding to the pulse peak, traverse the subsequent sampling points in chronological order; The current value of each sampling point is compared with the preset normal current value. When the current values ​​of multiple consecutive sampling points are all less than or equal to the preset normal current value for the first time, the time corresponding to the first sampling point is taken as the recovery time. The recovery duration is obtained by calculating the time difference between the recovery time and the target occurrence time.

5. The overcurrent protection method of claim 1, wherein, The overcurrent protection method further includes: When the absolute value of the descent slope is greater than or equal to the preset slope threshold, the recovery time is less than or equal to the preset time threshold, the equivalent heat integral is less than or equal to the thermal safety threshold, and the comprehensive risk value is less than or equal to 1, the historical sampling sequence within the cumulative time is obtained. Based on multiple pulse peaks in the historical sampling sequence, the equivalent heat integral of each pulse peak is accumulated to obtain the cumulative heat integral. When the accumulated heat volume is greater than the total thermal safety threshold, the driving current is determined to be abnormal and the overcurrent protection trigger signal is generated.

6. An overcurrent protection device, characterized by The overcurrent protection device, applied to the overcurrent protection method according to any one of claims 1-5, comprises: The current acquisition circuit is used to acquire the drive current on the drive signal line in real time and output the current sampling sequence. A peak detection circuit, connected to the current acquisition circuit, is used to detect the pulse peak value in the current sampling sequence and the target occurrence time corresponding to the pulse peak value; A slope detection circuit, connected to the peak detection circuit, is used to detect the falling slope of the current sampling sequence based on the sampling points within a preset time window after the pulse peak; and to output a falling slope abnormal signal when the absolute value of the falling slope is less than a preset slope threshold. A recovery time detection circuit, connected to the peak detection circuit, is used to monitor the recovery time when the pulse peak value in the current sampling sequence drops to a preset normal current value, calculate the recovery time from the target occurrence time to the recovery time, and output a recovery time abnormal signal when the recovery time is greater than a preset time threshold. A protection trigger circuit is connected to the slope detection circuit and the recovery time detection circuit respectively, and is used to generate an overcurrent protection trigger signal when the abnormal falling slope signal and / or the abnormal recovery time signal are received.

7. The overcurrent protection device of claim 6, wherein, The peak detection circuit includes: A comparator, a first transistor, a second transistor, a first resistor, a first current source, a second current source, and a digital processing unit; The non-inverting input of the comparator is connected to the output of the current acquisition circuit, and the inverting input of the comparator is connected to the peak identification threshold through the first resistor. The control terminal of the first transistor is connected to the output terminal of the comparator, the first terminal of the first transistor is connected to the power supply terminal through the first current source, and the second terminal of the first transistor is connected to the inverting input terminal of the comparator. The control terminal of the second transistor is connected to the control terminal of the first transistor, the first terminal of the second transistor is grounded through the second current source, and the second terminal of the second transistor is connected to the second terminal of the first transistor. The digital processing unit is connected to the output of the comparator and is used to identify the peak value of multiple candidate peak points output by the comparator to obtain the pulse peak value and the time when the target occurs. The turn-on voltages of the first transistor and the second transistor are opposite.

8. A display panel comprising a display area and a non-display area, the display area comprising a plurality of pixel units arranged in an array, characterized in that, The non-display area includes: A gate driving circuit, connected to the plurality of pixel units, is used to provide scanning signals; A source drive circuit, connected to the plurality of pixel units, is used to provide data signals; The overcurrent protection device as described in claim 6 or 7 is connected to the drive signal line in the gate drive circuit and / or the source drive circuit, for real-time monitoring of the drive current on the drive signal line, and generating an overcurrent protection trigger signal when an abnormal falling slope and / or abnormal recovery time are detected.

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