CN112102769B

CN112102769B - Display screen common voltage adjusting method and device, computer equipment and storage medium

Info

Publication number: CN112102769B
Application number: CN202011174039.7A
Authority: CN
Inventors: 刘广惟
Original assignee: Interface Optoelectronics Shenzhen Co Ltd; Interface Technology Chengdu Co Ltd; General Interface Solution Ltd
Current assignee: Interface Optoelectronics Shenzhen Co Ltd; Interface Technology Chengdu Co Ltd; General Interface Solution Ltd
Priority date: 2020-10-28
Filing date: 2020-10-28
Publication date: 2022-09-20
Anticipated expiration: 2040-10-28
Also published as: CN112102769A

Abstract

The application relates to a display screen common voltage adjusting method, a display screen common voltage adjusting device, computer equipment and a storage medium, wherein a first initial common voltage and a second initial common voltage which is larger than the first initial common voltage are obtained; acquiring a first initial flicker value and a second initial flicker value generated when a current display screen works under a first initial common voltage and a second initial common voltage; determining a public voltage adjustment trend according to the initial flicker variation trends of the first initial flicker value and the second initial flicker value; performing primary adjustment on the second initial public voltage according to the public voltage adjustment trend, acquiring an optimal reference public voltage from a primary adjustment result to be used as an initial public voltage of next-stage adjustment, and performing next-stage adjustment until the adjustment stage number meets a preset condition, and acquiring the optimal reference public voltage from a final-stage adjustment result to be used as an optimal value of the public voltage; the common voltage adjustment values corresponding to each level of adjustment are sequentially reduced, so that the accuracy of the optimal value of the common voltage can be improved.

Description

Display screen common voltage adjusting method and device, computer equipment and storage medium

Technical Field

The present application relates to the field of computer technologies, and in particular, to a method and an apparatus for adjusting a common voltage of a display screen, a computer device, and a storage medium.

Background

For a display screen, the stability of the display effect is crucial. Wherein flicker is a phenomenon that seriously affects display quality. Flicker can be effectively reduced by adjusting the common Voltage (VCOM) of the display screen.

At present, a common voltage adjustment method mainly includes obtaining a first common voltage and a second common voltage which are greater than a theoretical optimal common voltage, and a third common voltage and a fourth common voltage which are less than the theoretical optimal common voltage, obtaining a first flicker value corresponding to the first common voltage, a second flicker value corresponding to the second common voltage, a third flicker value corresponding to the third common voltage, and a fourth flicker value corresponding to the fourth common voltage, constructing a first curve according to the first flicker value corresponding to the first common voltage and the second flicker value corresponding to the second common voltage, constructing a second curve according to the third flicker value corresponding to the third common voltage and the fourth flicker value corresponding to the fourth common voltage, and taking an intersection point of the first curve and the second curve as an optimal value of the common voltage.

However, the optimum value of the common voltage is determined through four data points, the amount of data is too small, and the accuracy of the finally determined optimum value of the common voltage is low.

Disclosure of Invention

In view of the above, it is necessary to provide a display screen common voltage adjustment method, device, computer device and storage medium capable of improving accuracy of an optimal value of a common voltage.

A display screen common voltage adjusting method comprises the following steps:

acquiring a first initial common voltage and a second initial common voltage, and sequentially setting the first initial common voltage and the second initial common voltage as the working voltage of the current display screen; the first initial common voltage is less than the second initial common voltage;

acquiring a first initial flicker value generated when the current display screen works under a first initial common voltage and a second initial flicker value generated when the current display screen works under a second initial common voltage;

comparing the first initial flicker value with the second initial flicker value to obtain an initial flicker value variation trend, and determining a public voltage adjustment trend according to the initial flicker value variation trend;

taking the public voltage adjustment trend as a current adjustment trend, taking the second initial public voltage as a current initial public voltage, carrying out primary adjustment on the current initial public voltage according to the current adjustment trend, obtaining an optimal reference public voltage from a primary adjustment result as an initial public voltage of next-stage adjustment, and carrying out next-stage adjustment until the adjustment stage number meets a preset condition, and obtaining the optimal reference public voltage from a last-stage adjustment result as a target public voltage corresponding to the current display screen; the common voltage adjustment values corresponding to each level of adjustment are sequentially reduced.

A display screen common voltage adjustment apparatus, the apparatus comprising:

the public voltage acquisition module is used for acquiring a first initial public voltage and a second initial public voltage and sequentially setting the first initial public voltage and the second initial public voltage as the working voltage of the current display screen; the first initial common voltage is less than the second initial common voltage;

the flicker value acquisition module is used for acquiring a first initial flicker value generated when the current display screen works under a first initial common voltage and a second initial flicker value generated when the current display screen works under a second initial common voltage;

the trend determining module is used for comparing the first initial flicker value with the second initial flicker value to obtain an initial flicker value variation trend, and determining a public voltage adjustment trend according to the initial flicker value variation trend;

the target public voltage determining module is used for taking the public voltage adjustment trend as a current adjustment trend, taking the second initial public voltage as a current initial public voltage, carrying out primary adjustment on the current initial public voltage according to the current adjustment trend, obtaining an optimal reference public voltage from a primary adjustment result as an initial public voltage of next-stage adjustment, carrying out next-stage adjustment, and obtaining the optimal reference public voltage from a last-stage adjustment result as a target public voltage corresponding to the current display screen when the adjustment series meets a preset condition; the common voltage adjustment values corresponding to each level of adjustment are sequentially reduced.

A computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:

A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:

taking the public voltage adjustment trend as a current adjustment trend, taking a second initial public voltage as a current initial public voltage, carrying out primary adjustment on the current initial public voltage according to the current adjustment trend, obtaining an optimal reference public voltage from a primary adjustment result as an initial public voltage of next-stage adjustment, and carrying out next-stage adjustment until the adjustment series meets a preset condition, and obtaining the optimal reference public voltage from a final-stage adjustment result as a target public voltage corresponding to the current display screen; the common voltage adjustment values corresponding to each level of adjustment are sequentially reduced.

According to the display screen common voltage adjusting method, the display screen common voltage adjusting device, the computer equipment and the storage medium, the first initial common voltage and the second initial common voltage are sequentially set as the working voltage of the current display screen by acquiring the first initial common voltage and the second initial common voltage; the first initial common voltage is less than the second initial common voltage; acquiring a first initial flicker value generated when the current display screen works under a first initial common voltage and a second initial flicker value generated when the current display screen works under a second initial common voltage; comparing the first initial flicker value with the second initial flicker value to obtain an initial flicker value variation trend, and determining a public voltage adjustment trend according to the initial flicker value variation trend; taking the public voltage adjustment trend as a current adjustment trend, taking the second initial public voltage as a current initial public voltage, carrying out primary adjustment on the current initial public voltage according to the current adjustment trend, obtaining an optimal reference public voltage from a primary adjustment result as an initial public voltage of next-stage adjustment, and carrying out next-stage adjustment until the adjustment stage number meets a preset condition, and obtaining the optimal reference public voltage from a last-stage adjustment result as a target public voltage corresponding to the current display screen; the common voltage adjustment values corresponding to each level of adjustment are sequentially reduced. Therefore, the optimal value of the public voltage is determined by gradually adjusting and gradually reducing the adjustment value of the public voltage, and the accuracy of the optimal value of the public voltage can be effectively improved.

Drawings

FIG. 1 is a diagram illustrating an exemplary embodiment of a display screen common voltage adjustment method;

FIG. 2 is a schematic diagram illustrating a flowchart of a method for adjusting a common voltage of a display panel according to an embodiment;

FIG. 3 is a schematic flow chart illustrating the determination of a target common voltage in one embodiment;

FIG. 4 is a schematic diagram illustrating a flowchart of a method for adjusting a common voltage of a display panel according to another embodiment;

FIG. 4A is a diagram illustrating the step-by-step adjustment of the common voltage according to one embodiment;

FIG. 4B is a diagram illustrating a step-by-step adjustment of the common voltage in another embodiment;

FIG. 4C is a graph comparing the results of the present application and the conventional method in another embodiment;

FIG. 4D is a diagram illustrating a result of adjusting a common voltage of a display panel according to another embodiment;

FIG. 5 is a block diagram of a common voltage adjustment apparatus for a display panel according to an embodiment;

FIG. 6 is a diagram of the internal structure of a computer device in one embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

The method for adjusting the common voltage of the display screen can be applied to the application environment shown in fig. 1. Wherein the terminal 102 communicates with the display screen 104 through a physical interface. The terminal 102 may be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers, and portable wearable devices.

Specifically, the terminal may obtain a first initial common voltage and a second initial common voltage, and sequentially set the first initial common voltage and the second initial common voltage as the working voltage of the current display screen, where the first initial common voltage is less than the second initial common voltage. The terminal obtains a first initial flicker value generated when the current display screen works under a first initial common voltage and a second initial flicker value generated when the current display screen works under a second initial common voltage, compares the first initial flicker value with the second initial flicker value to obtain an initial flicker value variation trend, and determines a common voltage adjustment trend according to the initial flicker value variation trend. The terminal takes the public voltage adjustment trend as a current adjustment trend, takes the second initial public voltage as a current initial public voltage, performs primary adjustment on the current initial public voltage according to the current adjustment trend, obtains an optimal reference public voltage from a primary adjustment result as an initial public voltage of next-stage adjustment, performs next-stage adjustment, and obtains the optimal reference public voltage from a last-stage adjustment result as a target public voltage corresponding to the current display screen when the adjustment series meets a preset condition, wherein the public voltage adjustment values corresponding to the adjustment of each stage are sequentially reduced.

In one embodiment, as shown in fig. 2, a method for adjusting a common voltage of a display screen is provided, which is described by taking the method as an example of being applied to the terminal in fig. 1, and includes the following steps:

step S202, acquiring a first initial common voltage and a second initial common voltage, and sequentially setting the first initial common voltage and the second initial common voltage as the working voltage of the current display screen; the first initial common voltage is less than the second initial common voltage.

Step S204, a first initial flicker value generated when the current display screen works under the first initial common voltage and a second initial flicker value generated when the current display screen works under the second initial common voltage are obtained.

Specifically, the Display screen is a Liquid Crystal Display (LCD), the LCD is configured by placing a Liquid Crystal cell between two parallel glass substrates, a Thin Film Transistor (TFT) is disposed on the lower substrate glass, and a color filter is disposed on the upper substrate glass, and the rotation direction of Liquid Crystal molecules is controlled by changing signals and voltages on the TFT, so as to control whether polarized light of each pixel point is emitted or not to Display a picture. The common Voltage (VCOM) in the LCD is a reference voltage for the deflection of the liquid crystal molecules, that is, a voltage applied to the TFT for rotating the liquid crystal molecules. When the display screen is used, the display screen needs to be driven by alternating current, so that the liquid crystal needs to be driven by positive and negative polarities to display a picture. However, when the voltage difference applied to the liquid crystal by the two polarities is not the same, the difference in the brightness of the transmitted light between the two frames may cause flicker. The flicker not only affects the viewing experience of people, but also reduces the service life of the display screen. Different VCOMs may cause different levels of flicker, and in order to reduce flicker, the VCOM with the smallest flicker value may be obtained as the optimal value of the common voltage of the display panel. From the characteristics of flicker, the flicker value decreases with increasing VCOM when VCOM is less than the common voltage optimum, and increases with increasing VCOM when VCOM is greater than the common voltage optimum.

In order to determine the optimal value of the common voltage, the terminal may first obtain a first initial common voltage, and burn the first initial common voltage into the display screen, that is, use the first initial common voltage as the operating voltage of the display screen. The first initial common voltage may be randomly set, or may be set according to the optimal value of the common voltage of the same type of display screen. When the display screen works at the first initial common voltage, the terminal can acquire the brightness of a plurality of frames of display pictures output by the display screen through the optical test instrument, and a first flicker value is determined according to the brightness of each frame of display pictures. The terminal can add the first initial common voltage to a preset threshold value to obtain a second initial common voltage, and burn the second initial common voltage into the display screen, namely, the second initial common voltage is used as the working voltage of the display screen. When the display screen works at the second initial common voltage, the terminal can acquire the brightness of a plurality of frames of display images output by the display screen through the optical test instrument, and a second flicker value is determined according to the brightness of each frame of display images.

The optical testing instrument includes a photo-detector (photo-detector), a photomultiplier tube (photo multiplier), and any component capable of generating different electrical signals (including voltage, current, and resistance) for the intensity, illumination, and brightness difference of the light source.

In one embodiment, the terminal may write the register data corresponding to the common voltage to be set into a corresponding register in the display screen, and the register data may be transmitted from the register to a component responsible for outputting the voltage, and the component may convert the register data into the corresponding common voltage according to a pre-stored formula and then output the corresponding common voltage.

And S206, comparing the first initial flicker value with the second initial flicker value to obtain an initial flicker value variation trend, and determining a public voltage adjustment trend according to the initial flicker value variation trend.

And the public voltage adjustment trend comprises forward adjustment and backward adjustment and is used for adjusting the second initial public voltage to determine the optimal value of the public voltage. The forward adjustment refers to increasing the common voltage, and the backward adjustment refers to decreasing the common voltage.

Specifically, the terminal may compare the first initial flicker value and the second initial flicker value, and determine the initial flicker value variation trend according to the comparison result. When the first initial flicker value is greater than the second initial flicker value, it is determined that the initial flicker value changes in a tendency to increase in flicker value, that is, when the initial common voltage increases, the initial flicker value also increases. When the first initial flicker value is smaller than the second initial flicker value, it is determined that the initial flicker value changes to a tendency that the flicker value decreases, that is, when the initial common voltage increases, the initial flicker value decreases. After the initial flicker variation trend is determined, the terminal may determine the common voltage adjustment trend according to the initial flicker variation trend. Since the flicker value decreases as the VCOM increases when the VCOM is less than the optimum value of the common voltage, it may be considered that the first initial common voltage and the second initial common voltage are less than the optimum value of the common voltage when the initial flicker value variation tendency is that the flicker value decreases, and further, in order to determine the optimum value of the common voltage, it is necessary to increase the common voltage on the basis of the second initial common voltage, and thus, it is determined that the common voltage adjustment tendency is the forward adjustment. Since the flicker value increases with an increase in VCOM when VCOM is greater than the common voltage optimum value, when the initial flicker value variation tendency is an increase in flicker value, the first initial common voltage and the second initial common voltage may be considered to be greater than the common voltage optimum value, and further, in order to determine the common voltage optimum value, it is necessary to decrease the common voltage on the basis of the second initial common voltage, and thus, it is determined that the common voltage adjustment tendency is a backward adjustment. When the initial flicker value changes in a trend that the flicker value does not change, the common voltage may be increased or decreased based on the second initial common voltage.

Step S208, taking the public voltage adjustment trend as a current adjustment trend, taking the second initial public voltage as a current initial public voltage, carrying out primary adjustment on the current initial public voltage according to the current adjustment trend, obtaining an optimal reference public voltage from a primary adjustment result as the initial public voltage of next-stage adjustment, carrying out next-stage adjustment, and obtaining the optimal reference public voltage from a last-stage adjustment result as a target public voltage corresponding to the current display screen when the adjustment stage number meets a preset condition; the common voltage adjustment values corresponding to each level of adjustment are sequentially reduced.

Specifically, after the common voltage adjustment trend is determined, the terminal may use the common voltage adjustment trend as a current adjustment trend, use the second initial common voltage as a current initial common voltage, and perform primary adjustment according to the common voltage adjustment trend on the basis of the current initial common voltage to obtain a reference common voltage set corresponding to the primary adjustment. For example, when the public voltage adjustment trend is forward adjustment, the reference public voltage a may be obtained by adding a preset threshold to the second initial public voltage, a flicker value corresponding to the reference public voltage a is obtained, the reference public voltage B is obtained by adding the preset threshold to the reference public voltage a, a flicker value corresponding to the reference public voltage B is obtained, and by analogy, the forward adjustment may be stopped when the flicker value increases. The terminal can obtain the reference common voltage corresponding to the first flicker value increase from the reference common voltage set corresponding to the primary adjustment as the initial common voltage of the next-stage adjustment, and the next-stage adjustment is performed. The reference common voltage set corresponding to each level adjustment comprises a plurality of reference common voltages and flicker values corresponding to the reference common voltages. When a new level of adjustment is performed, forward adjustment and backward adjustment can be performed on the new starting common voltage to obtain a corresponding reference common voltage set. And acquiring a reference common voltage corresponding to the minimum flicker value from the new reference common voltage set as an initial common voltage of the next-stage adjustment, and performing the next-stage adjustment to obtain a corresponding reference common voltage set. And acquiring the reference common voltage corresponding to the minimum flicker value from the new reference common voltage set as the initial common voltage of the next-stage adjustment, and performing the next-stage adjustment. By analogy, three-level, four-level or n-level adjustment can be performed. Particularly, the common voltage adjustment value adopted by each stage of adjustment is smaller than the common voltage adjustment value adopted by the previous stage of adjustment, so that the search range of the optimal value of the common voltage is further narrowed by narrowing the common voltage adjustment value, and the accurate optimal value of the common voltage can be searched. And when the adjustment series meets the preset series, acquiring the reference common voltage corresponding to the minimum flicker value from the adjustment result of the last stage as the target common voltage corresponding to the current display screen, and determining the optimal value of the common voltage. The preset number of stages can be set as required, for example, three stages.

In the display screen common voltage adjusting method, the first initial common voltage and the second initial common voltage are sequentially set as the working voltage of the current display screen by acquiring the first initial common voltage and the second initial common voltage; the first initial common voltage is less than the second initial common voltage; acquiring a first initial flicker value generated when the current display screen works under a first initial common voltage and a second initial flicker value generated when the display screen works under a second initial common voltage; comparing the first initial flicker value with the second initial flicker value to obtain an initial flicker value variation trend, and determining a public voltage adjustment trend according to the initial flicker value variation trend; taking the public voltage adjustment trend as a current adjustment trend, taking a second initial public voltage as a current initial public voltage, carrying out primary adjustment on the current initial public voltage according to the current adjustment trend, obtaining an optimal reference public voltage from a primary adjustment result as an initial public voltage of next-stage adjustment, and carrying out next-stage adjustment until the adjustment series meets a preset condition, and obtaining the optimal reference public voltage from a final-stage adjustment result as a target public voltage corresponding to the current display screen; the common voltage adjustment values corresponding to the adjustment of each stage are sequentially reduced. Therefore, the optimal value of the public voltage is determined by gradually adjusting and gradually reducing the adjustment value of the public voltage, and the accuracy of the optimal value of the public voltage can be effectively improved.

In one embodiment, in step S206, that is, comparing the first initial flicker value with the second initial flicker value to obtain an initial flicker value variation trend, and the step of determining the common voltage adjustment trend according to the initial flicker value variation trend specifically includes: when the first initial flicker value is larger than the second initial flicker value, determining the change trend of the initial flicker value as the flicker value is increased; when the first initial flicker value is smaller than the second initial flicker value, determining the change trend of the initial flicker value as the flicker value is reduced; when the first initial flicker value is equal to the second initial flicker value, determining the change trend of the initial flicker value as the flicker value is unchanged; when the initial flicker value variation trend is that the flicker value is increased, determining that the public voltage adjustment trend is backward adjustment; when the initial flicker value variation trend is that the flicker value is reduced, determining that the public voltage adjustment trend is forward adjustment; and when the initial flicker value variation trend is that the flicker value is not changed, determining the public voltage adjustment trend to be any one of forward adjustment and backward adjustment.

Specifically, the terminal can determine whether the initial flicker value variation trend is an increase of the flicker value, a decrease of the flicker value or a constant flicker value by comparing the numerical values of the first initial flicker value and the second initial flicker value, preliminarily judge the magnitude relation between the first initial common voltage and the second initial common voltage and the optimum value of the common voltage according to the initial flicker value variation trend, and determine the search direction of the optimum value of the common voltage according to the preliminarily judged result. As can be seen from the characteristics of flicker, when VCOM is smaller than the optimum value of the common voltage, the flicker value decreases with the increase of VCOM, so when it is determined that the initial flicker value variation trend is that the flicker value decreases, it can be preliminarily determined that the first initial common voltage and the second initial common voltage are smaller than the optimum value of the common voltage, and thus the search direction of the optimum value of the common voltage can be determined as the forward search. When the VCOM is greater than the optimum value of the common voltage, the flicker value increases with an increase in VCOM, and thus when it is determined that the initial flicker value variation tendency is an increase in flicker value, it may be preliminarily determined that the first initial common voltage and the second initial common voltage are greater than the optimum value of the common voltage, so that it may be determined that the search direction of the optimum value of the common voltage is a backward search. When it is determined that the initial flicker value variation trend is unchanged, it may be preliminarily determined that the optimal value of the common voltage is between the first initial common voltage and the second initial common voltage, and at this time, it may be determined that the search direction of the optimal value of the common voltage is a forward search or a backward search. Because the flicker value is changed inevitably no matter the search is forward search or backward search, the adjustment of the next stage can be rapidly carried out from the initial adjustment.

In this embodiment, the initial flicker variation trend can be determined according to the comparison result of the first initial flicker value corresponding to the first initial common voltage and the second initial flicker value corresponding to the second initial common voltage, and the search direction of the optimum value of the common voltage can be quickly determined according to the initial flicker variation trend, so that the search efficiency of the optimum value of the common voltage can be improved.

In one embodiment, when the initial flicker value variation trend is that the flicker value is not changed, the method further comprises: and taking the public voltage adjustment trend as a current adjustment trend, taking the average value of the first initial public voltage and the second initial public voltage as a current initial public voltage, and carrying out primary adjustment on the current initial public voltage according to the current adjustment trend.

Specifically, when performing the primary adjustment, the terminal may use the common voltage adjustment trend as a current adjustment trend, use the second initial common voltage as a current starting common voltage, and perform the primary adjustment on the current starting common voltage according to the current adjustment trend. In order to further improve the efficiency of searching for the optimal value of the common voltage, when it is determined that the initial flicker value variation trend is unchanged according to the first initial flicker value and the second initial flicker value, it may be preliminarily determined that the optimal value of the common voltage is between the first initial common voltage and the second initial common voltage, at this time, the terminal may perform a preliminary adjustment between the first initial common voltage and the second initial common voltage by taking an average value of the first initial common voltage and the second initial common voltage as a current initial common voltage and taking a common voltage adjustment trend as a current adjustment trend.

In this embodiment, when the average value of the first initial common voltage and the second initial common voltage is used as the current starting common voltage, compared with when the second initial common voltage is directly used as the current starting common voltage, the search range of the optimum value of the common voltage can be further narrowed, so that the search efficiency of the optimum value of the common voltage is improved.

In one embodiment, as shown in fig. 3, step S208 specifically includes:

step S302, the preset rough common voltage adjustment value is used as an adjustment step length, and the second initial common voltage is adjusted for multiple times according to the common voltage adjustment trend to obtain multiple candidate common voltages.

Step S304, candidate flicker values respectively generated when the current display screen works under each candidate common voltage are obtained, two adjacent flicker values are compared from the second initial flicker value and each candidate flicker value, and the change trend of the target flicker value is determined.

And step S306, when the target flicker value changes to increase, taking the candidate common voltage corresponding to the candidate flicker value with the increased flicker value as the first reference common voltage.

Specifically, it may be preset that when the adjustment stage number reaches three stages, an optimal reference common voltage is obtained from an adjustment result corresponding to the third-stage adjustment as an optimal value of the common voltage. Firstly, during primary adjustment, the terminal may use a preset rough common voltage adjustment value as an adjustment step length, perform multiple adjustments on the second initial common voltage according to the common voltage adjustment trend to obtain multiple candidate common voltages, and determine candidate flicker values corresponding to the candidate common voltages by using the candidate common voltages as working voltages of the display screen in sequence. It can be understood that the voltage difference value of two adjacent candidate common voltages is a preset common voltage adjustment rough value. And comparing the two adjacent candidate flicker values, and when the candidate flicker value is determined to be increased for the first time according to the comparison result, namely when the target flicker value variation trend is the flicker value increase, stopping the initial adjustment, and randomly selecting one candidate common voltage from the two adjacent candidate common voltages corresponding to the target flicker value variation trend as the first reference common voltage. For example, the candidate common voltage for which the flicker value increases is selected as the first reference common voltage.

Taking the public voltage adjustment trend as an example for forward adjustment, during primary adjustment, adding a preset public voltage adjustment rough value to a second initial public voltage to obtain a candidate public voltage A, acquiring a candidate flicker value a corresponding to the candidate public voltage A, comparing the candidate flicker value a with the second initial flicker value, judging whether the flicker value is increased, and if the flicker value is increased, taking the candidate public voltage A as a first reference public voltage; and if the flicker value is not increased, adding a preset rough public voltage adjustment value to the candidate public voltage A to obtain a candidate public voltage B, obtaining a candidate flicker value B corresponding to the candidate public voltage B, comparing the candidate flicker value B with the candidate flicker value a, judging whether the flicker value is increased again, and if the flicker value is increased, taking the candidate public voltage B as a first reference public voltage.

Step S308, taking the preset middle value of the common voltage adjustment as an adjustment step, performing multiple forward adjustments and multiple backward adjustments on the first reference common voltage, to obtain multiple middle common voltages.

Step S310, obtaining intermediate flicker values respectively generated when the current display screen works under each intermediate common voltage, and obtaining the intermediate common voltage corresponding to the minimum intermediate flicker value from each intermediate flicker value as a second reference common voltage.

Specifically, after the first reference common voltage is determined, the second stage adjustment is entered. During the second-stage adjustment, the terminal may perform multiple forward adjustments and multiple backward adjustments on the first reference common voltage by using the preset common voltage adjustment intermediate value as an adjustment step length and using the first reference common voltage as an initial common voltage, so as to obtain multiple intermediate common voltages. And the terminal acquires the intermediate flicker values corresponding to the intermediate common voltages, and acquires the intermediate common voltage corresponding to the minimum intermediate flicker value from the intermediate flicker values as a second reference common voltage. And the preset common voltage adjustment intermediate value is smaller than the preset common voltage adjustment rough value.

Step S312, taking the fine adjustment value of the preset public voltage as an adjustment step length, and performing multiple forward adjustments and multiple backward adjustments on the second reference public voltage to obtain multiple updated public voltages; the preset public voltage adjustment fine value is smaller than the preset public voltage adjustment intermediate value, and the preset public voltage adjustment intermediate value is smaller than the preset public voltage adjustment rough value.

Step S314, obtaining the updated flicker values respectively generated when the current display screen operates under each updated common voltage, and obtaining the updated common voltage corresponding to the minimum updated flicker value from each updated flicker value as the target common voltage corresponding to the current display screen.

Specifically, when the second reference common voltage is determined, the third stage adjustment is entered. During the third-level adjustment, the terminal may use the preset fine common voltage adjustment value as an adjustment step length, use the second reference common voltage as an initial common voltage, and perform multiple forward adjustments and multiple backward adjustments on the second reference common voltage to obtain multiple updated common voltages. And the terminal acquires the updated flicker value corresponding to each updated common voltage, and acquires the updated common voltage corresponding to the minimum updated flicker value from each updated flicker value as the target common voltage. And the preset fine common voltage adjustment value is smaller than the preset intermediate common voltage adjustment value.

It can be understood that the adjustment step of the primary adjustment is the largest, the adjustment step of the secondary adjustment is centered, the adjustment step of the tertiary adjustment is the smallest, the adjustment steps are sequentially reduced, and the search range of the optimal value of the common voltage is gradually reduced, so that the optimal value of the common voltage can be quickly and accurately determined.

In one embodiment, the method of determining the first initial common voltage and the second initial common voltage includes the steps of: acquiring target common voltages corresponding to a plurality of target display screens of the same type as the current display screen; calculating the average value of target common voltages corresponding to a plurality of target display screens to obtain a first initial common voltage; and acquiring a preset rough common voltage adjustment value, and calculating the sum of the first initial common voltage and the preset rough voltage adjustment value to obtain a second initial common voltage.

In particular, the adjustment of the common voltage of the display screen may be at the time of manufacturing the display screen. The manufacturer can record and file the target common voltage corresponding to each display screen in various types as a piece of production data, and the production data can be used as reference data of the display screens produced subsequently when the common voltage is adjusted. When the common voltage of the current display screen needs to be adjusted, the terminal can obtain target common voltages corresponding to a plurality of target display screens of the same type as the current display screen from a database in which production data are stored, take the mean value of the target common voltages corresponding to the plurality of target display screens as a first initial common voltage of the current display screen, and add a preset common voltage adjustment rough value to the first initial common voltage to obtain a second initial common voltage. For example, ten thousand display screens of the same type are produced in the foregoing, and the average value of the register data corresponding to the target common voltage of the ten thousand display screens is 3185, so that when another ten thousand display screens of the same type are debugged, 3185 can be burned into the display screens as the initial register data.

In the embodiment, the first initial common voltage is determined according to the historical production data of the same type of display screen, and the first initial common voltage can be closer to the target common voltage, so that the target common voltage can be quickly searched during debugging, and the search efficiency is improved.

In one embodiment, the method for determining the flicker value comprises the steps of: acquiring the brightness corresponding to a multi-frame display picture which is output by the current display screen under the current public voltage; determining a brightness maximum value and a brightness minimum value from the brightness corresponding to each frame of display picture; and calculating the difference value of the maximum brightness value and the minimum brightness value as the flicker value corresponding to the current common voltage.

Specifically, the terminal can acquire the brightness corresponding to a plurality of frames of display pictures which are output by the current display screen under the current public voltage through an optical probe of the optical test instrument, determine the maximum brightness value and the minimum brightness value from the brightness corresponding to each frame of display pictures, and take the difference value between the maximum brightness value and the minimum brightness value as the flicker value corresponding to the current public voltage. The display contents corresponding to the respective frames of display screens may be the same or different. In order to improve the accuracy of the flicker value, a plurality of optical probes can be arranged in different areas of the display screen, a plurality of luminances corresponding to each frame of display picture are collected through the optical probes, and the maximum value and the minimum value of the luminance are determined from the luminances with sufficient data quantity.

In one embodiment, the display screen includes a plurality of liquid crystal molecules, each of which needs to be driven by applying a common voltage to display a picture. In order to improve the debugging efficiency, a target common voltage corresponding to the central liquid crystal molecules positioned in the center of the whole display screen can be determined, and then all the liquid crystal molecules of the display screen uniformly adopt the target common voltage. In addition, in order to improve the display effect of the display screen, the display screen may be divided into a plurality of sub-regions, the target common voltage corresponding to the central liquid crystal molecule of each sub-region is respectively determined, and subsequently, all the liquid crystal molecules of the same sub-region uniformly adopt the target common voltage corresponding to the central liquid crystal molecule of the sub-region. When determining the target common voltage corresponding to the central liquid crystal molecules, the optical probe may be disposed at a position on the display screen corresponding to the central liquid crystal molecules. For example, the optical probe is arranged in the center of the whole display screen and the optical probe is arranged in the center of the subarea.

In this embodiment, the flicker value can be determined quickly according to the maximum value and the minimum value of the brightness of the display screen.

Referring to fig. 4, fig. 4 is a flowchart illustrating a method for adjusting a common voltage of a display panel according to an embodiment.

The method comprises the steps of firstly burning an Initial common voltage value (Initial VCOM) to a display screen, detecting a Flicker value (Flicker value) corresponding to the Initial common voltage value, burning the Initial common voltage value plus a Rough common voltage adjustment value (Rough step) to the display screen, detecting the corresponding Flicker value, comparing the Flicker value with the Flicker value corresponding to the Initial common voltage value, entering case1 if the Flicker value is reduced, and entering case2 if the Flicker value is increased.

If the input enters case1, the common voltage is added once again to adjust the rough value and detect the corresponding flicker value, and whether the flicker value is increased is judged again, if the flicker value is increased, the latest common voltage value is taken as the first reference common voltage, and the middle scanning stage is entered; if not, continuing to add the public voltage adjustment rough value until the flicker value is determined to increase, and increasing the corresponding public voltage value by the flicker value to serve as a first reference public voltage to enter a middle scanning stage. Adding the corresponding common voltage to the flicker value as a first reference common voltage, adding the common voltage fine adjustment value to the first reference common voltage for several times, and subtracting the common voltage fine adjustment value for several times

Entering a middle scanning stage, setting a middle value (Mid value) of public voltage adjustment, adding the middle value of public voltage adjustment for a plurality of times and subtracting the middle value of public voltage adjustment for a plurality of times from a first reference public voltage, detecting a corresponding flicker value each time, comparing the detected flicker values in the middle scanning stage, obtaining the public voltage corresponding to the minimum flicker value from the detected flicker values, setting the public voltage as a minimum value (Min value), namely a second reference public voltage, and entering a fine tuning stage.

Entering the fine tuning phase, a fine value of the common voltage adjustment (p-value) is set, and starting from the minimum value, several intermediate values of the common voltage adjustment are added and several intermediate values of the common voltage adjustment are subtracted, for example,

min-p，min，min+p，

and detecting the corresponding flicker value every time, comparing the flicker values detected in the fine tuning stage, and obtaining the common voltage corresponding to the minimum flicker value as the target common voltage, namely the optimal VCOM value.

Therefore, the scanning range is confirmed by rough scanning at first, and then the accuracy is improved by reducing the scanning distance. Meanwhile, the scanning time can be effectively reduced by selecting a proper scanning initial value. In addition, the influence of the bias voltage on the display screen can be effectively reduced by narrowing the scanning range.

As shown in fig. 4A, the curve indicates that the flicker value varies with the variation of the common voltage. Assuming a Rough step of 30, the initial common voltage value corresponds to 3180 register data. 3180 and 30 are added to obtain 3210, and the flicker value corresponding to 3210 is compared with the flicker value corresponding to 3180, whereby it is found that the flicker value corresponding to 3210 decreases, and the routine advances to case 1. 3210 plus 30 gives 3240 the flicker value still decreases, 3240 plus 30 gives 3270 the flicker value still decreases, 3270 plus 30 gives 3300 the flicker value increases. Thus, with 3300 as the first reference, the mid-sweep phase is entered. Assuming that the Mid value is 10, after adding 10 to 3300, subtracting 10 six times successively, seven

points

3310, 3300, 3290, 3280, 3270, 3260, 3250 can be obtained, and from these seven points, 3280 corresponding to the minimum flicker value is taken as the second reference (min), and the fine tuning stage is entered. Assuming that the p value is 2, five points of 3276, 3278, 3280, 3282 and 3284 can be obtained from min-4, min-2, min +2 and min +4, and 3280 corresponding to the minimum flicker value is used as register data corresponding to the optimal VCOM.

If the step of entering Case2, subtracting the rough value of the public voltage adjustment once again, detecting a corresponding flicker value, judging whether the flicker value is increased, and if the flicker value is increased, entering a middle scanning stage by taking the latest public voltage value as a first reference public voltage; if the flicker value is not increased, the rough common voltage adjustment value is continuously subtracted until the flicker value is determined to be increased, and the corresponding common voltage value is increased by the flicker value to serve as a first reference common voltage, and a middle scanning stage is entered.

Entering the trimming phase, a fine value of the common voltage adjustment (p-value) is set and, starting from the minimum value, several intermediate values of the common voltage adjustment are added and several intermediate values of the common voltage adjustment are subtracted, for example,

min-p，min，min+p，

and detecting the corresponding flicker value every time, comparing the flicker values detected in the fine tuning stage, and obtaining the common voltage corresponding to the minimum flicker value, namely the optimal VCOM value.

As shown in fig. 4B, the curve indicates that the flicker value varies with the variation of the common voltage. Assuming a Rough step of 30, the initial common voltage value corresponds to 3180 register data. 3180 and 30 are added to obtain 3210, and the flicker value corresponding to 3180 is compared with the flicker value corresponding to 3210, so that the flicker value corresponding to 3210 is increased, and the routine advances to case 2. 3180 subtracting 30 gives 3150 and the scintillation still decreases, 3150 plus 30 gives 3120 and the scintillation still decreases, 3120 plus 30 gives 3090 and the scintillation increases. Thus 3090 as a first reference, enter the mid-sweep phase. Assuming that the Mid value is 10, after subtracting 10 from 3090, adding 10 for six consecutive times, seven points of 3080, 3090, 3100, 3110, 3120, 3130, 3140 can be obtained, and from these seven points, 3120 corresponding to the minimum flicker value is taken as the second reference (min), and the fine tuning stage is entered. Assuming that the p value is 2, five points of 3116, 3118, 3120, 3122, and 3124 are obtained from min-4, min-2, min +2, and min +4, and from these five points, 3120 corresponding to the minimum flicker value is used as register data corresponding to the optimal VCOM.

It was verified through experiments that the VCOM optimum adjusted by the method of the present application is more accurate than the VCOM optimum adjusted by the conventional technique (i.e., the method mentioned in the background). Although the manual adjustment method needs to be determined point by point and is time-consuming and labor-consuming, the manual adjustment method has the highest accuracy, so the manual adjustment method is used as a reference standard. When the VCOM optimum adjusted by the manual adjustment method and the other methods is the same, it appears as a straight line with a slope of 1 in fig. 4C. However, since there is always a certain error in the other methods, the smaller the error is, the more accurate the VCOM adjusted by the other methods is, the closer to a straight line is. While the dots in fig. 4C represent the VCOM optima adjusted by the conventional method, the triangles represent the VCOM optima adjusted by the method of the present application, it is apparent from fig. 4C that the VCOM optima adjusted by the method of the present application are more accurate than the VCOM optima adjusted by the conventional technique.

Referring to fig. 4D, it is verified through experiments that the difference between the optimal VCOM values adjusted by the method and the manual adjustment method of the present application is between-10 mV and 10mV under different standards (JEITA standard and FMA standard), which indicates that the method of the present application has high accuracy and reliability. Both the method and the manual adjustment method of the present application use the same optical test instrument (CA 310). Each display screen in fig. 4D corresponds to two attached bar graphs, the first bar graph being shown under JEITA standard and the second bar graph being shown under FMA standard.

It should be understood that, although the steps in the above-described flowcharts are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a part of the steps in the above-mentioned flowcharts may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the steps or the stages is not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a part of the steps or the stages in other steps.

In one embodiment, as shown in fig. 5, there is provided a display screen common voltage adjusting apparatus including: a common voltage acquisition module 502, a flicker value acquisition module 504, a trend determination module 506, and a target common voltage determination module 508, wherein:

a common voltage obtaining module 502, configured to obtain a first initial common voltage and a second initial common voltage, and set the first initial common voltage and the second initial common voltage as a working voltage of a current display screen in sequence; the first initial common voltage is less than the second initial common voltage;

a flicker value obtaining module 504, configured to obtain a first initial flicker value generated when the current display screen operates at a first initial common voltage, and a second initial flicker value generated when the current display screen operates at a second initial common voltage;

the trend determining module 506 is configured to compare the first initial flicker value with the second initial flicker value to obtain an initial flicker value variation trend, and determine a common voltage adjustment trend according to the initial flicker value variation trend;

a target common voltage determining module 508, configured to use the common voltage adjustment trend as a current adjustment trend, use the second initial common voltage as a current initial common voltage, perform primary adjustment on the current initial common voltage according to the current adjustment trend, obtain an optimal reference common voltage from a primary adjustment result, use the optimal reference common voltage as an initial common voltage for next-stage adjustment, perform next-stage adjustment, and obtain the optimal reference common voltage from a last-stage adjustment result as a target common voltage corresponding to the current display screen until the adjustment stage number meets a preset condition; the common voltage adjustment values corresponding to each level of adjustment are sequentially reduced.

In one embodiment, the trend determining module is further configured to determine that the initial flicker value changes in a trend of increasing flicker value when the first initial flicker value is greater than the second initial flicker value; when the first initial flicker value is smaller than the second initial flicker value, determining the change trend of the initial flicker value as the flicker value is reduced; when the initial flicker value variation trend is that the flicker value is increased, determining that the public voltage adjustment trend is backward adjustment; and when the initial flicker value change trend is that the flicker value is reduced, determining the public voltage adjustment trend as forward adjustment.

In one embodiment, the trend determining module is further configured to perform fine adjustment on the second initial common voltage when the first initial flicker value is equal to the second initial flicker value, and replace the second initial common voltage before the fine adjustment according to the second initial common voltage after the fine adjustment.

In one embodiment, the target common voltage determining module is further configured to adjust the second initial common voltage multiple times according to the common voltage adjustment trend with the preset coarse common voltage adjustment value as an adjustment step size to obtain multiple candidate common voltages; obtaining candidate flicker values respectively generated when the current display screen works under each candidate public voltage, comparing two adjacent candidate flicker values from each candidate flicker value, and determining the variation trend of the target flicker value; when the target flicker value changes from a trend that the flicker value is increased, taking the candidate public voltage corresponding to the candidate flicker value with the increased flicker value as a first reference public voltage; taking the preset public voltage adjustment intermediate value as an adjustment step length, and performing multiple forward adjustments and multiple backward adjustments on the first reference public voltage to obtain multiple intermediate public voltages; obtaining intermediate flicker values respectively generated when the current display screen works under each intermediate public voltage, and obtaining the intermediate public voltage corresponding to the minimum intermediate flicker value from each intermediate flicker value as a second reference public voltage; taking the preset fine adjustment value of the public voltage as an adjustment step length, and carrying out forward adjustment and backward adjustment on the second reference public voltage for multiple times to obtain multiple updated public voltages; the preset public voltage adjustment fine value is smaller than the preset public voltage adjustment intermediate value, and the preset public voltage adjustment intermediate value is smaller than the preset public voltage adjustment rough value; and obtaining updated flicker values respectively generated when the current display screen works under each updated common voltage, and obtaining the updated common voltage corresponding to the minimum updated flicker value from each updated flicker value as the target common voltage corresponding to the current display screen.

In one embodiment, the common voltage obtaining module is further configured to obtain a target common voltage corresponding to a plurality of target display screens of the same type as the current display screen; calculating the average value of target common voltages corresponding to a plurality of target display screens to obtain a first initial common voltage; and acquiring a preset rough common voltage adjustment value, and calculating the sum of the first initial common voltage and the preset rough voltage adjustment value to obtain a second initial common voltage.

In one embodiment, the flicker value obtaining module is further configured to obtain brightness corresponding to a multi-frame display image that is currently output by the display screen under the current common voltage; determining a brightness maximum value and a brightness minimum value from the brightness corresponding to each frame of display picture; and calculating the difference value of the maximum brightness value and the minimum brightness value as the flicker value corresponding to the current common voltage. The target public voltage determining module is also used for acquiring the brightness corresponding to a multi-frame display picture which is output by the current display screen under the current public voltage; determining a brightness maximum value and a brightness minimum value from the brightness corresponding to each frame of display picture; and calculating the difference value of the maximum brightness value and the minimum brightness value as the flicker value corresponding to the current common voltage.

For specific limitations of the display screen common voltage adjusting device, reference may be made to the above limitations of the display screen common voltage adjusting method, which are not described herein again. All or part of the modules in the display screen common voltage adjusting device can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.

In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 6. The computer device comprises a processor, a memory, a communication interface, a display screen and an input device which are connected through a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used for communicating with an external terminal in a wired or wireless manner, and the wireless manner can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a display screen common voltage adjustment method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.

Those skilled in the art will appreciate that the architecture shown in fig. 6 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.

In one embodiment, a computer device is provided, which includes a memory and a processor, the memory storing a computer program, the computer program, when executed by the processor, causing the processor to perform the steps of the above-mentioned display screen common voltage adjustment method. Here, the steps of the display panel common voltage adjusting method may be steps in the display panel common voltage adjusting methods of the above-described respective embodiments.

In one embodiment, a computer readable storage medium is provided, which stores a computer program, and when the computer program is executed by a processor, the processor executes the steps of the display screen common voltage adjusting method. Here, the steps of the display panel common voltage adjusting method may be the steps of the display panel common voltage adjusting methods of the above-described embodiments.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A method for adjusting a common voltage of a display screen is characterized by comprising the following steps:

acquiring a first initial flicker value generated when the current display screen works under the first initial common voltage and a second initial flicker value generated when the current display screen works under the second initial common voltage;

taking a preset rough public voltage adjustment value as an adjustment step length, and adjusting the second initial public voltage for multiple times according to the public voltage adjustment trend to obtain multiple candidate public voltages;

obtaining candidate flicker values respectively generated when the current display screen works under each candidate public voltage, comparing two adjacent flicker values from the second initial flicker value and each candidate flicker value, and determining the variation trend of the target flicker value;

when the target flicker value changes and trends to increase the flicker value, taking the candidate common voltage corresponding to the candidate flicker value with the increased flicker value as a first reference common voltage;

taking a preset public voltage adjustment intermediate value as an adjustment step length, and performing multiple forward adjustments and multiple backward adjustments on the first reference public voltage to obtain multiple intermediate public voltages;

obtaining intermediate flicker values respectively generated when the current display screen works under each intermediate public voltage, and obtaining an intermediate public voltage corresponding to the minimum intermediate flicker value from each intermediate flicker value as a second reference public voltage;

taking a preset fine common voltage adjustment value as an adjustment step length, and performing multiple forward adjustments and multiple backward adjustments on the second reference common voltage to obtain multiple updated common voltages; the preset public voltage fine adjustment value is smaller than the preset public voltage middle adjustment value, and the preset public voltage middle adjustment value is smaller than the preset public voltage rough adjustment value;

and obtaining updated flicker values respectively generated when the current display screen works under each updated common voltage, and obtaining the updated common voltage corresponding to the minimum updated flicker value from each updated flicker value as the target common voltage corresponding to the current display screen.

2. The method of claim 1, wherein comparing the first initial flicker value with the second initial flicker value to obtain an initial flicker value variation trend, and determining a common voltage adjustment trend according to the initial flicker value variation trend comprises:

when the first initial flicker value is larger than the second initial flicker value, determining that the initial flicker value changes in a trend that the flicker value is increased;

when the first initial flicker value is smaller than the second initial flicker value, determining that the initial flicker value changes in a trend that the flicker value decreases;

when the first initial flicker value is equal to the second initial flicker value, determining that the initial flicker value changes in a trend that the flicker value is unchanged;

when the initial flicker value variation trend is that the flicker value is reduced, determining that the public voltage adjustment trend is forward adjustment;

when the initial flicker value variation trend is that the flicker value increases, determining that the public voltage adjustment trend is backward adjustment;

and when the initial flicker value variation trend is that the flicker value is not changed, determining that the common voltage adjustment trend is any one of forward adjustment and backward adjustment.

3. The method according to claim 2, wherein when the initial flicker value changes trend to a flicker value, the method further comprises:

and taking the public voltage adjustment trend as a current adjustment trend, taking the average value of the first initial public voltage and the second initial public voltage as a current starting public voltage, and carrying out primary adjustment on the current starting public voltage according to the current adjustment trend.

4. The method of claim 1, wherein the method of determining the first initial common voltage and the second initial common voltage comprises the steps of:

acquiring target common voltages corresponding to a plurality of target display screens of the same type as the current display screen;

calculating the average value of the target common voltages corresponding to the target display screens to obtain the first initial common voltage;

and acquiring a preset rough common voltage adjustment value, and calculating the sum of the first initial common voltage and the preset rough voltage adjustment value to obtain a second initial common voltage.

5. The method according to any one of claims 1 to 4, characterized in that the method for determining the flicker value comprises the steps of:

acquiring the brightness corresponding to a multi-frame display picture which is output by the current display screen under the current public voltage;

determining a brightness maximum value and a brightness minimum value from the brightness corresponding to each frame of display picture;

and calculating the difference value of the maximum brightness value and the minimum brightness value as the flicker value corresponding to the current common voltage.

6. The method according to claim 5, wherein the obtaining the brightness corresponding to the multi-frame display image that the current display screen is operated and output under the current common voltage comprises:

acquiring a plurality of sub-brightnesses corresponding to the same frame of display picture which is output by the current display screen under the current public voltage through a plurality of optical probes arranged on the current display screen to obtain a plurality of sub-brightnesses corresponding to each frame of display picture;

and obtaining the brightness corresponding to each frame of display picture based on a plurality of sub-brightnesses corresponding to the same frame of display picture.

7. A display screen common voltage adjusting device, comprising:

the flicker value acquisition module is used for acquiring a first initial flicker value generated when the current display screen works under the first initial common voltage and a second initial flicker value generated when the current display screen works under the second initial common voltage;

the target public voltage determining module is used for adjusting the second initial public voltage for multiple times according to the public voltage adjusting trend by taking a preset public voltage adjusting rough value as an adjusting step length to obtain multiple candidate public voltages; obtaining candidate flicker values respectively generated when the current display screen works under each candidate public voltage, comparing two adjacent flicker values from the second initial flicker value and each candidate flicker value, and determining the variation trend of the target flicker value; when the target flicker value changes and trends to increase the flicker value, taking the candidate common voltage corresponding to the candidate flicker value with the increased flicker value as a first reference common voltage; taking a preset public voltage adjustment intermediate value as an adjustment step length, and performing multiple forward adjustments and multiple backward adjustments on the first reference public voltage to obtain multiple intermediate public voltages; obtaining intermediate flicker values respectively generated when the current display screen works under each intermediate public voltage, and obtaining an intermediate public voltage corresponding to the minimum intermediate flicker value from each intermediate flicker value as a second reference public voltage; presetting a fine adjustment value of the public voltage as an adjustment step length, and performing multiple forward adjustments and multiple backward adjustments on the second reference public voltage to obtain multiple updated public voltages; the preset public voltage fine adjustment value is smaller than the preset public voltage middle adjustment value, and the preset public voltage middle adjustment value is smaller than the preset public voltage rough adjustment value; and obtaining updated flicker values respectively generated when the current display screen works under each updated common voltage, and obtaining the updated common voltage corresponding to the minimum updated flicker value from each updated flicker value as the target common voltage corresponding to the current display screen.

8. The device of claim 7, wherein the common voltage obtaining module is further configured to obtain a target common voltage corresponding to a plurality of target display screens of a same type as the current display screen; calculating the average value of the target common voltages corresponding to the target display screens to obtain the first initial common voltage; and acquiring a preset rough common voltage adjustment value, and calculating the sum of the first initial common voltage and the preset rough voltage adjustment value to obtain a second initial common voltage.

9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 6.

10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 6.