A method for adjusting the VCOM value of a display module

Abstract

This invention provides a method and system for adjusting the VCOM value of a display module. The method includes: providing a display module; setting an initial step size; testing the flicker value of the display module along the initial step size within the VCOM value range; determining a candidate valley interval based on the relationship between adjacent step size measurement points and flicker values; acquiring all VCOM points in the candidate valley interval; fitting a parabola based on the relationship between VCOM points and flicker values; calculating the abscissa of the parabola; defining a verification interval radius and calculating the verification interval boundary; scanning the flicker values ​​of VCOM points in the verification interval boundary with a step size of 1 to obtain the minimum true flicker value and the true optimal point; calculating an error value based on the abscissa of the parabola and the true optimal point; and determining whether convergence has occurred based on the error value and the true flicker value to determine the final VCOM value. This invention can efficiently determine the VCOM value of a display module.

Description

Technical Field

[0001] This invention relates to the field of display module testing technology, and in particular to a method for adjusting the VCOM value of a display module. Background Technology

[0002] Screen flickering in the display module directly impacts user experience, and its root cause lies in the mismatch between the VCOM voltage and the center value of the pixel electrode voltage. Adjusting the VCOM register value in the display driver IC can change the VCOM voltage, minimizing flicker. Therefore, accurately and efficiently finding the optimal VCOM value for each display module and programming it into the IC is a crucial step in ensuring display quality.

[0003] Existing VCOM programming methods are mainly divided into the following two categories: global traversal method and interval limitation method based on batch sampling.

[0004] The global traversal method measures the flicker value corresponding to each VCOM value in a minimum step (e.g., 1) within the full adjustable range of VCOM (e.g., 0~255), and selects the point with the lowest flicker as the optimal value. Although this method has high accuracy, the number of measurements is as high as 256, and the time taken for a single module is too long (about 25 seconds or more), which cannot meet the efficiency requirements of modern production lines.

[0005] The interval-limited method based on batch sampling first extracts several modules from the same batch, and calculates a common optimal VCOM range (e.g., 80~110) through global scanning or large step scanning. Then, it performs fine scanning on all modules only within this range. This method is significantly faster than global traversal, but it has obvious drawbacks: Dependence on batch consistency: Once the batch characteristics of raw materials such as LCD glass and driver ICs drift, the pre-determined common range may completely deviate from the true optimal area, resulting in a serious decline in the burning effect, and even requiring manual intervention to redetermine the range.

[0006] Ignoring individual differences: Even within the same batch, the optimal VCOM value still varies between different modules due to slight variations in the manufacturing process. Fixed-range programming cannot find the truly optimal solution for every module, thus sacrificing display consistency for some modules. Summary of the Invention In view of the shortcomings of the prior art, the purpose of this invention is to provide a method for adjusting the VCOM value of a display module, which aims to solve the technical problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: A method for adjusting the VCOM value of a display module includes the following steps: A display module is provided, an initial step size is set, and within the range of VCOM values, the flicker value of the display module is tested along the initial step size. Based on the relationship between adjacent step size measurement points and flicker values, a candidate valley interval is determined. Obtain all VCOM points in the candidate valley interval, assume the relationship between VCOM points and flicker values ​​to fit a parabola, and calculate the abscissa of the parabola; Define the radius of the verification interval and calculate the boundary of the verification interval. Scan the flicker value of the VCOM point in the boundary of the verification interval with a step size of 1 to obtain the minimum true flicker value and the true optimal point. The error value is calculated based on the abscissa of the parabola and the true optimal point, and the convergence is determined based on the error value and the true flicker value to determine the final VCOM value.

[0008] According to one aspect of the above technical solution, the provision of a display module, setting an initial step size, testing the flicker value of the display module along the initial step size within the VCOM value range, and determining candidate valley intervals based on the relationship between adjacent step size measurement points and flicker values, specifically includes the following steps: A display module is provided, an initial step size is set, and within the VCOM value range, the V values ​​at each step size measurement point are measured sequentially along the initial step size. i flicker value F i ; Calculate the difference Δ between the scintillation values ​​of adjacent step-size measurement points sequentially. i And confirm the first judgment condition based on the difference; Where, Δ i =F i -F i-1 The first judgment condition: Δ i 1 < 0 and Δ i >0; Calculate the change S between adjacent differences in turn. i And confirm the second judgment condition based on the change value; Among them, S i =sign(Δ i -Δ i-1 ), The second judgment condition: S i >0, and S i-1 <0, ε ​​is taken as 0.3~0.5dB; Based on the difference Δ between the scintillation values ​​of three adjacent step-size measurement points i Confirm the third judgment condition; The third judgment condition is: max(|Δ) i-2 |, |Δ i-1 |, |Δ i |)<ε; When any one of the first judgment condition, the second judgment condition, or the third judgment condition is satisfied, V i As a candidate trough range; If the first judgment condition, the second judgment condition, or the third judgment condition is not triggered after global measurement, then the step measurement point corresponding to the region where the global minimum flicker value is located is taken as the candidate valley interval.

[0009] According to one aspect of the above technical solution, the steps of obtaining all VCOM points in the candidate valley interval, assuming the relationship between VCOM points and flicker values ​​to fit a parabola, and calculating the abscissa of the parabola include: Obtain all VCOM points in the candidate valley interval, and fit a parabola by assuming the relationship between VCOM points and flicker values; F(V) = aV 2 +bV+c ; Where F represents the blink value and V represents the VCOM point, a , b , c Indicates the coefficients to be determined; The objective function is constructed with the goal of minimizing the sum of squared errors between the fitted parabola and the measured true flicker value. ; Where m represents the number of all VCOM points in the candidate valley interval; Define a matrix based on the objective function and solve the matrix using the least squares method; ; ; Based on the solution of the matrix, calculate the abscissa V of the parabola. pred ; .

[0010] According to one aspect of the above technical solution, the steps of defining the verification interval radius and calculating the verification interval boundary, scanning the flicker values ​​of VCOM points in the verification interval boundary with a step size of 1, and obtaining the minimum true flicker value and the true optimal point include: Define the radius R of the verification interval, and calculate the boundary V of the verification interval based on the x-coordinate of the parabola and the radius of the verification interval. low and V high ; in, γ represents the minimum verification radius constant, and STEP represents the initial step size. , ; Scan the flicker values ​​of all VCOM points within the verification interval boundary with a step size of 1 to record the minimum true flicker value F. min And the true optimal point V real ; in, , F(V) represents the blink value of the VCOM point.

[0011] According to one aspect of the above technical solution, the steps of calculating the error value based on the abscissa of the parabola and the true optimal point, and determining whether convergence has occurred based on the error value and the true flicker value, to determine the final VCOM value, specifically include: Calculate the error value E between the x-coordinate of the parabola and the true optimal point; Where E=|V pred -V real |; Define the convergence condition, and determine whether convergence has occurred based on the error value and the actual flicker value. If convergence has occurred, the actual optimal point is used as the final VCOM value. The convergence condition is: E≤2 and F min ≤-30dB; If convergence is not achieved, the radius of the verification interval is expanded, the boundary of the verification interval is updated, and the minimum true flicker value and the true optimal point are recalculated. The convergence is determined by the error value after iteration and the true optimal point, until convergence is achieved or the maximum number of iterations is reached. If convergence is not achieved after the maximum number of iterations, the final VCOM value is taken as the true optimal point measured last.

[0012] According to one aspect of the above technical solution, if the step fails to converge, then after expanding the verification interval radius and updating the verification interval boundary, the method further includes: If the updated verification interval boundary contains unmeasured VCOM points, then the scintillation value corresponding to those VCOM points needs to be measured, and a parabola fitted to update the VCOM value. pred .

[0013] The present invention also provides a display module VCOM value adjustment system, comprising: Test module: Provides a display module, sets an initial step size, tests the flicker value of the display module along the initial step size within the VCOM value range, and determines the candidate valley interval based on the relationship between adjacent step size test points and flicker values; Calculation module: Obtain all VCOM points in the candidate valley interval, fit a parabola based on the relationship between VCOM points and flashing values, and calculate the abscissa of the parabola; Scanning module: Defines the radius of the verification interval and calculates the boundary of the verification interval. Scans the flicker value of VCOM points in the boundary of the verification interval with a step size of 1 to obtain the minimum true flicker value and the true optimal point; Judgment module: Calculates the error value based on the abscissa of the parabola and the true optimal point, and judges whether convergence is achieved based on the error value and the true flicker value, so as to determine the final VCOM value.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention employs a pre-set initial step size coarse scanning and trend recognition mechanism. By calculating the change trend of the flicker value between adjacent step size measurement points in real time, it can quickly identify candidate valley intervals during the coarse scanning stage, avoiding traversing the entire VCOM range. Typically, the number of measurements per module is reduced from 256 to 30-50, shortening the search time by more than 80% and significantly improving production line capacity. Unlike solutions that rely on batch averages, this invention uses quadratic curve fitting based entirely on the current module's own measurement data to establish an individualized "VCOM-flicker" parabolic model. By solving for the optimal fitting coefficients and using the parabola vertex to predict the optimal VCOM value, a fine scanning confirmation is performed using a dynamic verification interval. This mechanism can accurately capture the unique characteristics of each module, unaffected by batch drift or intra-batch discreteness, ensuring that each module operates at its true optimal flicker point. By setting a prediction error threshold and a minimum flicker value requirement as dual convergence conditions, the search results are ensured to be both accurate and meet product specifications. When the initial prediction deviates from the actual measurement beyond the allowable range, the algorithm will automatically expand the verification interval and refit, setting a maximum number of iterations, such as a maximum of two iterations, to ensure that the final output is reliable and effective under any complex conditions. Attached Figure Description

[0015] Figure 1 This is a flowchart of the method for adjusting the VCOM value of the display module in the first embodiment of the present invention; Figure 2 for Figure 1 The diagram shows the structure of the VCOM value adjustment system for the display module. The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0016] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0017] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] Please see Figure 1 The image shows a method for adjusting the VCOM value of a display module according to the first embodiment of the present invention, which includes the following steps: S10, provide a display module, set an initial step size, test the flicker value of the display module along the initial step size within the VCOM value range, and determine the candidate valley interval based on the relationship between adjacent step size measurement points and flicker values; S20, obtain all VCOM points in the candidate valley interval, assume the relationship between VCOM points and flashing values ​​to fit a parabola, and calculate the abscissa of the parabola; S30, define the radius of the verification interval and calculate the boundary of the verification interval. Scan the flicker value of the VCOM point in the boundary of the verification interval with a step size of 1 to obtain the minimum true flicker value and the true optimal point; S40, calculate the error value based on the abscissa of the parabola and the true optimal point, and determine whether convergence is achieved based on the error value and the true flicker value, so as to determine the final VCOM value.

[0020] Understandably, this invention employs a pre-set initial step size coarse scanning and trend recognition mechanism. By calculating the changing trend of the flicker value between adjacent step size measurement points in real time, it can quickly lock the candidate valley interval during the coarse scanning stage, avoiding traversing the entire VCOM range. Typically, the number of measurements per module is reduced from 256 to 30-50, shortening the search time by more than 80% and significantly improving production line capacity. Unlike solutions that rely on batch averages, this invention is entirely based on the current module's own measurement data for quadratic curve fitting, establishing an individualized "VCOM-flicker" parabolic model. By solving for the optimal fitting coefficients and using the parabola vertex to predict the optimal VCOM value, a fine scanning confirmation is performed using a dynamic verification interval. This mechanism can accurately capture the unique characteristics of each module, unaffected by batch drift or intra-batch discreteness, ensuring that each module operates at its true optimal flicker point. By setting a prediction error threshold and a minimum flicker value requirement as dual convergence conditions, the search results are ensured to be both accurate and meet product specifications. When the initial prediction deviates from the actual measurement beyond the allowable range, the algorithm will automatically expand the verification interval and refit, setting a maximum number of iterations, such as a maximum of two iterations, to ensure that the final output is reliable and effective under any complex conditions.

[0021] Furthermore, the specific steps of step S10 include: A display module is provided, an initial step size is set, and within the VCOM value range, the V values ​​at each step size measurement point are measured sequentially along the initial step size. i flicker value F i ; Calculate the difference Δ between the scintillation values ​​of adjacent step-size measurement points sequentially. i And confirm the first judgment condition based on the difference; Where, Δ i =F i -F i-1 The first judgment condition: Δ i 1 < 0 and Δ i >0; Calculate the change S between adjacent differences in turn. i And confirm the second judgment condition based on the change value; Among them, S i =sign(Δ i -Δ i-1 ), The second judgment condition: S i >0, and S i-1 <0, ε ​​is taken as 0.3~0.5dB; Based on the difference Δ between the scintillation values ​​of three adjacent step-size measurement points i Confirm the third judgment condition; The third judgment condition is: max(|Δ) i-2 |, |Δ i-1 |, |Δ i |)<ε; When any one of the first judgment condition, the second judgment condition, or the third judgment condition is satisfied, V i As a candidate trough range; If the first judgment condition, the second judgment condition, or the third judgment condition is not triggered after global measurement, then the step measurement point corresponding to the region where the global minimum flicker value is located is taken as the candidate valley interval.

[0022] Understandably, this step defines three complementary candidate interval triggering conditions: the first condition captures the typical valley feature of "first decreasing and then increasing"; the second condition uses second-order difference to identify the decreasing-increasing transition zone with significant curvature changes; and the third condition addresses the case where the flicker value is flat and unchanged. These three conditions work together to reliably identify various forms of flicker-VCOM curves, avoiding missed or false detections. Simultaneously, an ε value of 0.3~0.5dB eliminates false transitions caused by measurement noise, enhancing the algorithm's robustness. The fallback strategy (taking the global minimum point) when there is no global trigger ensures that a valid candidate interval is output under any circumstances.

[0023] Furthermore, the specific steps of step S20 include: Obtain all VCOM points in the candidate valley interval, and fit a parabola by assuming the relationship between VCOM points and flicker values; F(V) = aV 2 +bV+c ; Where F represents the blink value and V represents the VCOM point, a , b , c Indicates the coefficients to be determined; The objective function is constructed with the goal of minimizing the sum of squared errors between the fitted parabola and the measured true flicker value. ; Where m represents the number of all VCOM points in the candidate valley interval; Define a matrix based on the objective function and solve the matrix using the least squares method; ; ; Based on the solution of the matrix, calculate the abscissa V of the parabola. pred ; .

[0024] Understandably, this step starts with measured data within the candidate interval to establish a parabolic model of the flicker value and VCOM for the display module on an individual basis. The least squares method is used to solve for the coefficients, ensuring that the sum of squared errors between the fitted curve and the measured values ​​is minimized, thus obtaining a parabola that best approximates the actual physical properties. The vertex is analytically solved for VCOM. pred = -b / (2a) provides an accurate prediction of the optimal VCOM value. Compared to simply taking the average or midpoint, this prediction based on the curve shape can adapt to different degrees of curvature and asymmetry of different modules, significantly improving the prediction accuracy.

[0025] Furthermore, the specific steps of step S30 include: Define the radius R of the verification interval, and calculate the boundary V of the verification interval based on the x-coordinate of the parabola and the radius of the verification interval. low and V high ; in, γ represents the minimum verification radius constant, and STEP represents the initial step size. , ; Scan the flicker values ​​of all VCOM points within the verification interval boundary with a step size of 1 to record the minimum true flicker value F. min And the true optimal point V real ; in, , F(V) represents the blink value of the VCOM point.

[0026] Understandably, this step employs a dynamic verification interval mechanism. The radius R is adaptively calculated based on the current step size (R = max(γ, (STEP / 2))) to ensure that the verification range sufficiently covers the fluctuating area around the true optimal point, while avoiding unnecessary wide-area measurements. In this embodiment, γ is set to 3. Scanning with a minimum step size of 1 ensures that the final found true optimal point achieves the highest theoretical accuracy achievable by the hardware. This step is a practical "test" of the prediction results, requiring only scanning a small area (usually no more than 10 points) to confirm or correct the predicted value, balancing accuracy and efficiency.

[0027] Furthermore, the specific steps of step S40 include: Calculate the error value E between the x-coordinate of the parabola and the true optimal point; Where E=|V pred -V real |; Define the convergence condition, and determine whether convergence has occurred based on the error value and the actual flicker value. If convergence has occurred, the actual optimal point is used as the final VCOM value. The convergence condition is: E≤2 and F min ≤-30dB; If convergence is not achieved, the radius of the verification interval is increased (e.g., to 2R), the boundaries of the verification interval are updated, and the minimum true flicker value and the true optimal point are recalculated. The convergence is determined by the error value after iteration and the true optimal point, until convergence is achieved or the maximum number of iterations is reached. If convergence is not achieved after the maximum number of iterations, the final VCOM value is taken as the true optimal point measured last.

[0028] Understandably, this step establishes clear dual convergence conditions: the positional error does not exceed 2 (ensuring sufficient proximity to the true optimal point) and the lowest flicker value meets the product specification of ≤-30dB (ensuring display quality meets standards). This guarantees both the accuracy of the search results and the optical consistency of the manufactured products. When the initial prediction deviation is large, the validation interval is automatically expanded and refitted, iteratively correcting the prediction model. Convergence to the true optimal point occurs in at most two iterations. This mechanism effectively handles extremely discrete individual differences or fitting anomalies, giving the algorithm strong robustness and adaptability, requiring no manual intervention.

[0029] Furthermore, if the above steps do not converge, the process further includes expanding the verification interval radius and updating the verification interval boundaries, followed by: If the updated verification interval boundary contains unmeasured VCOM points, then the scintillation value corresponding to those VCOM points needs to be measured, and a parabola fitted to update the VCOM value. pred .

[0030] Understandably, this step serves as a supplementary mechanism for iterative correction, ensuring that newly added VCOM points are measured and incorporated into the fitted dataset in a timely manner after the validation interval is expanded. Refitting the parabola using these new data points significantly improves the accuracy of the parabolic model, especially when the initial coarse scan points are few and the fitted model is distorted. Through this closed loop of supplementary measurement and refitting, the algorithm's predictive ability is continuously improved, and the prediction error after the second iteration typically drops to less than 1, thus quickly meeting the convergence condition. This design ensures that the entire search process will not fail due to insufficient initial information, and the final output of the optimal VCOM value is highly reliable.

[0031] In summary, the VCOM value adjustment method for display modules in the above embodiments of the present invention can efficiently determine the VCOM value of display modules. Please refer to Figure 2 The figure shows a VCOM value adjustment system for a display module according to a second embodiment of the present invention, comprising: Test module 11: Provides a display module, sets an initial step size, tests the flicker value of the display module along the initial step size within the VCOM value range, and determines the candidate valley interval based on the relationship between adjacent step size test points and flicker values; Calculation module 12: Obtain all VCOM points in the candidate valley interval, assume the relationship between VCOM points and flashing values ​​to fit a parabola, and calculate the abscissa of the parabola; Scanning module 13: Defines the radius of the verification interval and calculates the boundary of the verification interval. It scans the flicker value of the VCOM point in the boundary of the verification interval with a step size of 1 to obtain the minimum true flicker value and the true optimal point. Judgment module 14: Calculates the error value based on the abscissa of the parabola and the true optimal point, and judges whether convergence is achieved based on the error value and the true flicker value, so as to determine the final VCOM value.

[0032] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," 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 the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0033] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for adjusting the VCOM value of a display module, characterized in that, Includes the following steps: A display module is provided, an initial step size is set, and within the range of VCOM values, the flicker value of the display module is tested along the initial step size. Based on the relationship between adjacent step size measurement points and flicker values, candidate valley intervals are determined. Obtain all VCOM points in the candidate valley interval, assume the relationship between VCOM points and flicker values ​​to fit a parabola, and calculate the abscissa of the parabola; Define the radius of the verification interval and calculate the boundary of the verification interval. Scan the flicker value of the VCOM point in the boundary of the verification interval with a step size of 1 to obtain the minimum true flicker value and the true optimal point. The error value is calculated based on the abscissa of the parabola and the true optimal point, and the convergence is determined based on the error value and the true flicker value to determine the final VCOM value.

2. The method for adjusting the VCOM value of a display module according to claim 1, characterized in that, The provision of a display module involves setting an initial step size, testing the flicker value of the display module along the initial step size within the VCOM value range, and determining candidate valley intervals based on the relationship between adjacent step size measurement points and flicker values. Specific steps include: A display module is provided, an initial step size is set, and within the VCOM value range, the V values ​​at each step size measurement point are measured sequentially along the initial step size. i flicker value F i ; Calculate the difference Δ between the scintillation values ​​of adjacent step-size measurement points sequentially. i And confirm the first judgment condition based on the difference; Where, Δ i =F i -F i-1 The first judgment condition: Δ i 1 < 0 and Δ i >0; Calculate the change S between adjacent differences in turn. i And confirm the second judgment condition based on the change value; Among them, S i =sign(Δ i -Δ i-1 ), The second judgment condition: S i >0, and S i-1 <0, ε ​​is taken as 0.3~0.5dB; Based on the difference Δ between the scintillation values ​​of three adjacent step-size measurement points i Confirm the third judgment condition; The third judgment condition is: max(|Δ) i-2 |, |Δ i-1 |, |Δ i |)<ε; When any one of the first judgment condition, the second judgment condition, or the third judgment condition is satisfied, V i As a candidate trough range; If the first judgment condition, the second judgment condition, or the third judgment condition is not triggered after global measurement, then the step measurement point corresponding to the region where the global minimum flicker value is located is taken as the candidate valley interval.

3. The method for adjusting the VCOM value of a display module according to claim 2, characterized in that, The steps for obtaining all VCOM points in the candidate valley interval, fitting a parabola based on the relationship between VCOM points and flicker values, and calculating the abscissa of the parabola include: Obtain all VCOM points in the candidate valley interval, and fit a parabola by assuming the relationship between VCOM points and flicker values; F(V) = aV 2 +bV+c ； Where F represents the blink value and V represents the VCOM point, a , b , c Indicates the coefficients to be determined; The objective function is constructed with the goal of minimizing the sum of squared errors between the fitted parabola and the measured true flicker value. ； Where m represents the number of all VCOM points in the candidate valley interval; Define a matrix based on the objective function and solve the matrix using the least squares method; ； ； Based on the solution of the matrix, calculate the abscissa V of the parabola. pred ; 。 4. The method for adjusting the VCOM value of a display module according to claim 3, characterized in that, The process involves defining the radius of the verification interval, calculating the boundary of the verification interval, and scanning the flicker values ​​of VCOM points within the boundary of the verification interval with a step size of 1 to obtain the minimum true flicker value and the true optimal point. Specific steps include: Define the radius R of the verification interval, and calculate the boundary V of the verification interval based on the x-coordinate of the parabola and the radius of the verification interval. low and V high ; in, γ represents the minimum verification radius constant, and STEP represents the initial step size. , ; Scan the flicker values ​​of all VCOM points within the verification interval boundary with a step size of 1 to record the minimum true flicker value F. min And the true optimal point V real ; in, , F(V) represents the blink value of the VCOM point.

5. The method for adjusting the VCOM value of a display module according to claim 1, characterized in that, The steps include: calculating the error value based on the abscissa of the parabola and the true optimal point, and determining whether convergence has occurred based on the error value and the true flicker value to determine the final VCOM value. Calculate the error value E between the x-coordinate of the parabola and the true optimal point; Where E=|V pred -V real |; Define the convergence condition, and determine whether convergence has occurred based on the error value and the actual flicker value. If convergence has occurred, the actual optimal point is used as the final VCOM value. The convergence condition is: E ≤ 2 and F min ≤-30dB; If convergence is not achieved, the radius of the verification interval is expanded, the boundary of the verification interval is updated, and the minimum true flicker value and the true optimal point are recalculated. The convergence is determined by the error value after iteration and the true optimal point, until convergence is achieved or the maximum number of iterations is reached. If convergence is not achieved after the maximum number of iterations, the final VCOM value is taken as the true optimal point measured last.

6. The method for adjusting the VCOM value of a display module according to claim 5, characterized in that, If the above steps do not converge, the process then proceeds after expanding the verification interval radius and updating the verification interval boundaries: If the updated verification interval boundary contains unmeasured VCOM points, then the scintillation value corresponding to those VCOM points needs to be measured, and a parabola fitted to update the VCOM value. pred .

7. A VCOM value adjustment system for a display module, characterized in that, include: Test module: Provides a display module, sets an initial step size, tests the flicker value of the display module along the initial step size within the VCOM value range, and determines the candidate valley interval based on the relationship between adjacent step size test points and flicker values; Calculation module: Obtain all VCOM points in the candidate valley interval, assume the relationship between VCOM points and flashing values ​​to fit a parabola, and calculate the abscissa of the parabola; Scanning module: Defines the radius of the verification interval and calculates the boundary of the verification interval. Scans the flicker value of VCOM points in the boundary of the verification interval with a step size of 1 to obtain the minimum true flicker value and the true optimal point; Judgment module: Calculates the error value based on the abscissa of the parabola and the true optimal point, and judges whether convergence is achieved based on the error value and the true flicker value, so as to determine the final VCOM value.

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