CN115223513A

CN115223513A - Liquid crystal display panel and compensation method thereof

Info

Publication number: CN115223513A
Application number: CN202210683135.7A
Authority: CN
Inventors: 胡洋; 李荣荣
Original assignee: HKC Co Ltd
Current assignee: HKC Co Ltd
Priority date: 2022-06-15
Filing date: 2022-06-15
Publication date: 2022-10-21
Anticipated expiration: 2042-06-15
Also published as: CN115223513B

Abstract

The application discloses a liquid crystal display panel and a compensation method thereof, wherein the liquid crystal display panel comprises a plurality of sub-pixels which are arranged in an array manner, and the compensation method of the liquid crystal display panel comprises the following steps: acquiring the display gray scale of each sub-pixel in the selected area through a time sequence controller; calculating a display gray scale representation value of each sub-pixel in the selected area, and judging whether the display gray scale representation value is not less than a set multiple of the maximum display gray scale of the sub-pixel in the selected area; the display gray scale representation value represents the whole level of the display gray scale of the selected area; if yes, acquiring input voltage of actual output gray scale corresponding to the display gray scale, and driving the pixel electrode of each sub-pixel in the selected area based on the input voltage so as to change the light transmission quantity of the liquid crystal layer through the pixel electrode and enable each sub-pixel in the selected area to achieve the display gray scale. Through the structure, the crosstalk phenomenon of the display picture is improved, and the display effect of the display picture is further improved.

Description

Liquid crystal display panel and compensation method thereof

Technical Field

The invention relates to the field of display panels, in particular to a liquid crystal display panel and a compensation method thereof.

Background

A Liquid Crystal Display (LCD) is a mainstream Display panel in the current market, and the LCD deflects Liquid crystals at different angles by an electric field formed by a voltage difference between a pixel electrode and a common electrode to realize different transmittances, thereby realizing Display of different gray scales.

However, the voltage of the data line (Source line) is constantly refreshed to update the image, and in order to prevent polarization of the liquid crystal, the liquid crystal is usually driven to deflect by changing the positive and negative polarities, which are referenced as a common electrode (CFCOM), a positive polarity voltage higher than the common electrode, and a negative polarity voltage lower than the common electrode. Due to the constant change of the voltage of the data line (Source line), the voltage on the common electrode (CFCOM) is changed due to the capacitive coupling effect, thereby affecting the deflection angle of the liquid crystal and the gray scale display of the picture.

In a special frame, when the common electrode is coupled very severely, a horizontal cross talk (crosstalk) phenomenon may be caused.

Disclosure of Invention

The present application mainly solves the technical problem of providing a liquid crystal display panel and a compensation method thereof to improve the crosstalk phenomenon of a display image and further improve the display effect of the display image.

In order to solve the above problem, the present application provides a compensation method for a liquid crystal display panel, where the liquid crystal display panel includes a plurality of sub-pixels arranged in an array, and the compensation method for the liquid crystal display panel includes: acquiring the display gray scale of each sub-pixel in the selected area through a time sequence controller; wherein the display gray scale comprises positive gray scale data and negative gray scale data; calculating a display gray scale representation value of each sub-pixel in a selected area, and judging whether the display gray scale representation value is not less than a set multiple of the maximum display gray scale of the sub-pixel in the selected area; wherein the display gray scale characterization value characterizes an overall level of display gray scale of the selected region; if so, acquiring an input voltage of an actual output gray scale corresponding to the display gray scale, and driving the pixel electrode of each sub-pixel of the selected area based on the input voltage so as to change the light transmission quantity of the liquid crystal layer through the pixel electrode and enable each sub-pixel of the selected area to reach the display gray scale.

Therefore, the actual display gray scale of each sub-pixel deviates from the original display gray scale due to the existence of the capacitive coupling effect, the gray scale adjustment value of the current row is obtained by calculating according to the gray scale data of each sub-pixel of the current row through the time schedule controller, and the gray scale data of each sub-pixel is adjusted according to the adjustment value, so that the actual display gray scale of each sub-pixel reaches the expected display gray scale.

Wherein the selected area is a current line; the step of obtaining the display gray scale of each sub-pixel of the selected area through the time schedule controller comprises the following steps: acquiring the display gray scale of each sub-pixel of the current row; the step of calculating the display gray scale representation value of each sub-pixel in the selected area and judging whether the display gray scale representation value is not less than the set multiple of the maximum display gray scale of the sub-pixel in the selected area comprises the following steps: calculating a display gray scale representation value of each sub-pixel of the current row, and judging whether the display gray scale representation value is larger than a set multiple of the maximum display gray scale of the sub-pixel of the current row; the step of acquiring an input voltage of an actual output gray scale corresponding to the display gray scale, and driving the pixel electrode of each sub-pixel of the selected region based on the input voltage to change the amount of light passing through the liquid crystal layer by the pixel electrode, so that each sub-pixel of the selected region reaches the display gray scale includes: acquiring input voltage of each sub-pixel of the current row, and driving a pixel electrode of each sub-pixel of the current row based on the input voltage so as to change the light flux of a liquid crystal layer through the pixel electrode and enable each sub-pixel of the current row to reach the display gray scale.

Therefore, when the selected area is a row, the entire screen of the liquid crystal display panel is normally displayed by adjusting the pixels of the row.

The step of calculating a display gray scale representation value of each sub-pixel in the selected area and judging whether the display gray scale representation value is not less than a set multiple of the maximum display gray scale of the sub-pixel in the selected area includes: calculating gray scales and values of the sub-pixels of the positive gray scale data and the sub-pixels of the negative gray scale data of the selected area; and carrying out normalization processing on the gray scale sum value to obtain the display gray scale representation value.

Thus, the display gray scale characterization value can characterize the overall level of display gray scale for the selected region.

The step of calculating a display gray scale representation value of each sub-pixel in the selected area and determining whether the display gray scale representation value is not less than a set multiple of the sub-pixel with the maximum display gray scale in the selected area includes: calculating the sum of the maximum display gray scales of all the sub-pixels in the current area to obtain a maximum sum; calculating the ratio of the absolute value of the gray scale sum value to the maximum sum value to obtain the multiple of the display gray scale representation value and the maximum display gray scale of the sub-pixels in the selected area; judging whether the multiple is not less than the set multiple; wherein the multiple is between 0 and 1, and the set multiple is not less than 0.2.

Therefore, the normalization process is specifically performed by using the maximum value, and in other embodiments, the average value may also be used for calculation.

If so, acquiring an input voltage of an actual output gray scale corresponding to the display gray scale, and driving a pixel electrode of each sub-pixel of the selected area based on the input voltage to change the light transmission amount of a liquid crystal layer through the pixel electrode, so that each sub-pixel of the selected area reaches the display gray scale, including: and if so, calculating to obtain an adjustment value of the display gray scale according to the display gray scale representation value and the maximum display gray scale.

Therefore, the adjustment value reflects the relationship between the display gray scale representation value and the maximum display gray scale, and also reflects the degree of influence of the display gray scale of the sub-pixel on the sub-pixel with the maximum display gray scale.

The step of obtaining an input voltage of an actual output gray scale corresponding to the display gray scale, and driving the pixel electrode of each sub-pixel of the selected area based on the input voltage to change the amount of light passing through the liquid crystal layer by the pixel electrode, so that each sub-pixel of the selected area reaches the display gray scale includes: acquiring a gray scale adjustment table of a current liquid crystal display panel; searching the actual output gray scale of each sub-pixel from the gray scale adjusting table according to the display gray scale and the adjusting value; and driving the pixel electrode of each sub-pixel based on the input voltage corresponding to the actual output gray scale so as to change the light transmission quantity of the liquid crystal layer through the pixel electrode and enable each sub-pixel in the selected area to reach the display gray scale.

Therefore, the display gray scale is adjusted by referring to the pre-established gray scale adjusting table.

Wherein the step of searching the actual output gray scale of each sub-pixel from the gray scale adjustment table according to the display gray scale and the adjustment value comprises: judging whether the display gray scale exists in the gray scale adjusting table or not; if not, acquiring a first display gray scale and a second display gray scale adjacent to the display gray scale, a first output gray scale corresponding to the first display gray scale and a second output gray scale corresponding to the second display gray scale from the gray scale adjustment table based on the display gray scale of the sub-pixels and the adjustment value, and calculating by using a linear interpolation method to obtain the actual output gray scale corresponding to the display gray scale; and if so, searching the gray scale adjustment table according to the display gray scale and the set multiple to obtain the actual output gray scale of the sub-pixel.

If the gray scale adjustment table has no corresponding display gray scale, calculating by using a linear interpolation method to obtain an actual output gray scale corresponding to the display gray scale. Therefore, the gray scale adjustment table can be properly simplified, and the gray scale adjustment table only lists the actual output gray scales corresponding to a plurality of commonly used display gray scales.

After the step of determining whether the display gray scale representation value is not less than the set multiple of the maximum display gray scale of the sub-pixels in the selected area, the method further includes: if not, the actual output gray scale of the sub-pixel is not adjusted.

Therefore, if not, it indicates that the display gray scale deviation is not large, no adjustment is required.

The compensation method of the liquid crystal display panel further comprises the following steps: dividing each sub-pixel of the selected area into a plurality of pixel groups; the step of obtaining the display gray scale of each sub-pixel of the selected area through the time sequence controller comprises the following steps: acquiring the display gray scale of each pixel group in a selected area through a time sequence controller; the step of calculating the display gray scale representation value of each sub-pixel in the selected area and judging whether the display gray scale representation value is not less than the set multiple of the maximum display gray scale of the sub-pixel in the selected area comprises the following steps: calculating a display gray scale representation value of each pixel group in a selected area, and judging whether the display gray scale representation value is not less than a set multiple of the maximum display gray scale of the pixel group in the selected area; if so, acquiring an input voltage of an actual output gray scale corresponding to the display gray scale, and driving the pixel electrode of each sub-pixel of the selected area based on the input voltage so as to change the light flux of the liquid crystal layer through the pixel electrode and enable each sub-pixel of the selected area to reach the display gray scale, wherein the step comprises the following steps: if yes, acquiring an input voltage of an actual output gray scale of each pixel group, and driving the pixel electrode of each pixel group in the selected area based on the input voltage so as to change the light transmission quantity of the liquid crystal layer through the pixel electrode and enable each pixel group in the selected area to reach the display gray scale.

Therefore, the adjustment can be performed by grouping or blocking, thereby reducing the adjustment workload.

The present application further provides a liquid crystal display panel regulating circuit, the liquid crystal display panel regulating circuit includes: the liquid crystal display comprises a time sequence controller, a source electrode driver electrically connected with the time sequence controller, a liquid crystal display panel electrically connected with the source electrode driver, and a gamma controller electrically connected with the source electrode driver and the liquid crystal display panel; the time sequence controller is used for acquiring the display gray scale of each sub-pixel in the selected area; calculating a display gray scale representation value of each sub-pixel in a selected area, and judging whether the display gray scale representation value is not less than a set multiple of the maximum display gray scale of the sub-pixel in the selected area; if so, acquiring an input voltage of an actual output gray scale corresponding to the display gray scale, and transmitting the input voltage to the source driver; the source driver is used for receiving an input voltage of the time schedule controller and driving the pixel electrode of each sub-pixel of the selected area in the liquid crystal display panel based on the input voltage; the gamma controller simultaneously supplies a gamma signal to the source driver and inputs a constant common voltage to a common electrode of the liquid crystal display panel.

Therefore, the display gray scale of each sub-pixel is adjusted by the time schedule controller.

The application further provides a liquid crystal display panel, which comprises an array substrate, a color film substrate and a liquid crystal layer positioned between the array substrate and the color film substrate, wherein the array substrate comprises a plurality of sub-pixels which are arranged in an array manner, each sub-pixel comprises a pixel electrode, and the pixel electrode and a common electrode on the color film substrate form a pixel capacitor to control the deflection of the liquid crystal layer; the time sequence controller is used for acquiring the display gray scale of each sub-pixel in the selected area; wherein the display gray scale comprises positive gray scale data and negative gray scale data; calculating a display gray scale representation value of each sub-pixel in a selected area, and judging whether the display gray scale representation value is not less than a set multiple of the maximum display gray scale of the sub-pixel in the selected area; wherein the display gray scale characterization value characterizes an overall level of display gray scale of the selected region; and if so, acquiring input voltage of actual output gray scale corresponding to the display gray scale, and driving the pixel electrode of each sub-pixel of the selected area based on the input voltage so as to change the light flux of the liquid crystal layer through the pixel electrode and enable each sub-pixel of the selected area to reach the display gray scale.

Therefore, the charging rate of the sub-pixels charged by the data lines connected with the sub-pixels is controlled by the time schedule controller, so that the sub-pixels display normal gray scale data, the crosstalk phenomenon of a display picture is improved, and the display effect of the display picture is improved.

The beneficial effect of this application is: the display gray scale of each sub-pixel in the selected area is obtained through the time sequence controller, the display gray scale representation value of each sub-pixel in the selected area is calculated, whether the display gray scale representation value is not smaller than the set multiple of the maximum display gray scale of the sub-pixel in the selected area or not is judged, if yes, the input voltage of the actual output gray scale corresponding to the display gray scale is obtained, the pixel electrode of each sub-pixel in the selected area is driven based on the input voltage, the voltage on two sides of the liquid crystal layer is changed through the pixel electrode of the sub-pixel, the deflection angle of the liquid crystal is further controlled to control the luminous flux of the liquid crystal, the sub-pixel reaches the display gray scale in the presence of crosstalk, the crosstalk phenomenon of a display picture is improved, and the display effect of the display picture is further improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic flowchart illustrating a compensation method of a liquid crystal display panel according to a first embodiment of the present invention;

FIG. 2 is a schematic view of a structure of one embodiment of a polarity arrangement of sub-pixels according to the present application;

FIG. 3 is a flowchart illustrating an embodiment of step S12 of the present application;

FIG. 4 is a schematic structural diagram illustrating step S13 according to one embodiment of the present application;

FIG. 5 is a flowchart illustrating a compensation method for a liquid crystal display panel according to a second embodiment of the present invention;

FIG. 6 is a schematic view of a display screen according to the present application;

FIG. 7 is a schematic circuit diagram of an embodiment of a control circuit of an LCD panel according to the present invention;

FIG. 8 is a schematic circuit diagram of an OP compensation in accordance with the prior art embodiment;

FIG. 9 is a simplified circuit schematic of the embodiment of FIG. 7;

FIG. 10 is a schematic structural diagram of an embodiment of a liquid crystal display panel according to the present application.

71 an array substrate; 72 color film substrate; 73 a liquid crystal layer; 74 a timing controller; 711 pixel electrodes; 721 a common electrode.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, the "plurality" typically includes at least two, but does not exclude the presence of at least one.

It should be understood that the term "and/or" as used herein is merely a relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B, may represent: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should be understood that the terms "comprises," "comprising," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

It should be noted that if directional indications (such as upper, lower, left, right, front, rear, 8230; \8230;) are referred to in the embodiments of the present application, the directional indications are only used for explaining the relative positional relationship between the components in a specific posture (as shown in the attached drawings), the motion situation, etc., and if the specific posture is changed, the directional indications are correspondingly changed.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a first embodiment of a compensation method for a liquid crystal display panel according to the present application. As shown in fig. 1, the compensation method of the liquid crystal display panel includes:

step S11: and acquiring the display gray scale of each sub-pixel in the selected area through the time sequence controller.

The display gray scale refers to the display brightness gray scale of the current sub-pixel to be displayed. The display gray scale includes positive gray scale data and negative gray scale data. The positive gray scale data refers to the display gray scale brightness generated by the sub-pixels through positive polarity voltage, and the negative gray scale data refers to the display gray scale brightness generated by the sub-pixels through negative polarity voltage. Therefore, the display gray scale includes the voltage polarity and the display brightness. The positive polarity voltage is a voltage greater than the common electrode (CFCOM) voltage, and the negative polarity voltage is a voltage less than the common electrode (CFCOM) voltage.

The display gray scale is obtained through a display picture, the display picture comprises display brightness required by a plurality of pixels or sub-pixels, and the display picture required to be displayed by the liquid crystal display panel can be obtained only through enabling the pixels or the sub-pixels to achieve the required display brightness.

In this embodiment, the polarities of the voltages of the sub-pixels in two adjacent columns are opposite, that is, the liquid crystal display panel is driven in a polarity by a column inversion method. If the sub-pixels of the first column are driven with positive voltages, the sub-pixels of the second column are driven with negative voltages, and so on. In other embodiments, the liquid crystal display panel may also be dot-inverted polarity driven. Referring to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of a polarity arrangement of a sub-pixel according to the present application. As shown in fig. 2, the pixel includes three sub-pixels R, G, and B, and the three sub-pixels are arranged in columns, and in other embodiments, the three sub-pixels may be arranged in rows or in other arrangements, which is not limited herein. The voltage polarities of the sub-pixels in two adjacent columns are opposite, the first column is positive-polarity voltage, and the second column is negative-polarity voltage.

Step S12: and calculating the display gray scale representation value of each sub-pixel in the selected area, and judging whether the display gray scale representation value is not less than the set multiple of the maximum display gray scale of the sub-pixel in the selected area.

The display gray scale representation value can represent the whole level of the display gray scale of the selected area and is obtained by comprehensively calculating the display gray scale value of each sub-pixel of the selected area. The display gray scale characterization value may be an average value, a normalized value, a root-mean-square value, etc. of the display gray scales.

The method specifically comprises the following steps: and calculating the display gray scale representation value of the selected area according to the display gray scale of each sub-pixel, and obtaining the relation between the display gray scale representation value and the maximum display gray scale.

In a specific calculation manner, the step further includes steps S21 to S23. Specifically, referring to fig. 3, fig. 3 is a flowchart illustrating an embodiment of step S12 of the present application. As shown in fig. 3, step S12 includes:

step S21: the gray scale sum value of the sub-pixels of the positive gray scale data and the sub-pixels of the negative gray scale data of the selected area is calculated.

The gray scale sum value is the sum of the display gray scales of all the sub-pixels in the selected area.

For example, there are 960 pixels having a display gray level of +127, 960 pixels having a display gray level of-127, and 960 pixels having a display gray level of +255 and 960 pixels having a display gray level of-0 in the selected area, and the total number of the pixels is 1920, wherein each pixel includes three sub-pixels (RGB), and thus, the total number of the sub-pixels is 1920 × 3.

The gray scale sum of all sub-pixels of the selected area is: (+ 127) × (960 × 3/2) + (-127) × (960 × 3/2) + (+ 255) × (960 × 3/2) + (-0) × (960 × 3/2) = +367200.

In other embodiments, the gray scale sum value may be the absolute value of the sum of the display gray scales of all the sub-pixels of the selected area. Then, in the above example, the sum of gray levels is 367200.

Step S22: and carrying out normalization processing on the gray scale sum value to obtain a display gray scale representation value.

In this embodiment, step S22 includes calculating a sum of maximum display gray levels of all sub-pixels in the current region to obtain a maximum sum; normalizing the gray scale sum value by using the maximum sum value to obtain a normalized value; and calculating to obtain the display gray scale representation value of the sub-pixel according to the normalized value.

For example, in the above example, the maximum display gray levels of the sub-pixels are +255 (full bright with polarity) and-0 (full dark with polarity). The gray scale sum value of all the sub-pixels in the selected area when the maximum display gray scale is displayed is the maximum sum value, and the maximum sum value is as follows: (+ 255) × (1920 × 3/2) + (-0) × (960 × 3/2) = +734400. The ratio of the gray scale sum value to the maximum sum value is a normalized value, and the normalized value is as follows: +367200/+734400=0.5. The display gray scale characterization value is 0.5 × 255=127.5.

In other embodiments, the display gray scale characterization value may also be an average value of the display gray scales of each sub-pixel of the selected region. Taking the above example as a calculation basis, the display gray scale representation value is equal to the gray scale sum divided by the number of sub-pixels: + 367200/(1920 × 3/2) = +127.5.

The display gray scale representation value can reflect that the display gray scale of the sub-pixel is influenced by the maximum display gray scale.

Step S23: and judging whether the display gray scale representation value is not less than the set multiple of the maximum display gray scale of the sub-pixels in the selected area.

The maximum display gray scale refers to the display gray scale of the sub-pixel with the largest display gray scale in the selected region, in other words, the display gray scale of the sub-pixel with the brightest display gray scale in the selected region.

The method comprises the following steps: and calculating the ratio of the display gray scale representation value to the maximum display gray scale of the sub-pixels in the selected area, and judging whether the ratio is not less than a set multiple. Wherein the ratio is between 0 and 1.

If so, adjusting the write voltage of the sub-pixel, and if not, not adjusting the voltage of the sub-pixel.

In this embodiment, the multiple is set to be not less than 0.2, that is, when the display gray scale representation value is greater than or equal to 20% of the maximum display gray scale of the sub-pixel in the selected area, it indicates that the display gray scale representation value is different from the maximum display gray scale, and the sub-pixel in the selected area is greatly affected by the sub-pixel with the maximum display gray scale (crosstalk phenomenon), and the sub-pixel needs to be adjusted.

Step S13: if so, acquiring an input voltage of an actual output gray scale corresponding to the display gray scale, and driving the pixel electrode of each sub-pixel in the selected area based on the input voltage so as to change the light transmission quantity of the liquid crystal layer through the pixel electrode and enable each sub-pixel in the selected area to achieve the display gray scale.

Specifically, the time schedule controller controls the writing voltage signal of the pixel electrode of each sub-pixel so as to control the charging amount of the pixel electrode, the pixel electrode changes the voltage at two sides of the liquid crystal layer, and further the deflection angle of the liquid crystal is controlled so as to control the luminous flux of the liquid crystal, so that the sub-pixels display the display gray scale. The pixel electrode and the common electrode form a pixel capacitor, liquid crystal is arranged between the pixel electrode and the common electrode, the voltage on the common electrode is generally unchanged, and the deflection of the liquid crystal is controlled by controlling the voltage of the pixel electrode, so that the display gray scale of the sub-pixels is controlled.

The method specifically comprises the following steps: and when the display gray scale representation value is greater than or equal to the set multiple of the maximum display gray scale of the sub-pixel in the selected area, calculating to obtain an adjustment value of the display gray scale according to the display gray scale representation value and the maximum display gray scale. In one embodiment, the adjustment value is a ratio of the display gray scale characterization value to the maximum display gray scale. In other embodiments, the adjustment value may be a normalized value, and the like, and is not limited herein. The adjustment value is a value capable of reflecting the corresponding relationship between the display gray scale representation value and the maximum display gray scale.

After the adjustment value is obtained, the step further includes steps S31 to S33, specifically please refer to fig. 4, where fig. 4 is a schematic structural diagram of an embodiment of step S13 in the present application. As shown in fig. 4, step S13 includes:

step S31: and acquiring a gray scale adjustment table of the current liquid crystal display panel.

The gray scale adjustment table is a table which is established in advance and can reflect the relationship among the adjustment value, the originally displayed display gray scale and the adjusted actual output gray scale.

The gray scale adjustment table can be adjusted by testing the crosstalk improvement condition by an instrument, and is related to the condition that the current liquid crystal display panel is influenced by crosstalk. Different liquid crystal display panels are affected by crosstalk in different situations, some of the liquid crystal display panels are affected greatly, and some of the liquid crystal display panels are affected slightly, so that gray scale adjustment tables of the different liquid crystal display panels are different.

Step S32: and searching the actual output gray scale of each sub-pixel from the gray scale adjusting table according to the display gray scale and the adjusting value.

Judging whether the display gray scale is in a gray scale adjusting table or not; if so, directly acquiring an actual output gray scale corresponding to the display gray scale and the adjustment value from the gray scale adjustment table; if not, calculating to obtain the actual output gray scale corresponding to the display gray scale and the adjustment value by a linear interpolation method.

Specifically, a first display gray scale and a second display gray scale adjacent to the display gray scale are searched from the gray scale adjustment table, a first output gray scale is searched from the gray scale adjustment table according to the first display gray scale and the adjustment value, a second output gray scale is searched from the gray scale adjustment table according to the second display gray scale and the adjustment value, and an actual output gray scale corresponding to the display gray scale between the first display gray scale and the second display gray scale is calculated by utilizing the linear relation between the first display gray scale and the first output gray scale and the linear relation between the second display gray scale and the second output gray scale, namely the display gray scale and the actual output gray scale meet the linear relation.

In other embodiments, the method further comprises determining whether the adjustment value is in a gray scale questionnaire, and if not, calculating by linear interpolation to obtain the actual output gray scale. And is not limited thereto.

Step S33: and driving the pixel electrode of each sub-pixel based on the input voltage corresponding to the actual output gray scale so as to change the light flux of the liquid crystal layer through the pixel electrode and enable each sub-pixel in the selected area to achieve the display gray scale.

When the input voltage corresponding to the actual output gray scale is normally driven to the pixel electrode of the sub-pixel, the sub-pixel can display the actual output gray scale. However, due to the existence of the crosstalk phenomenon, the sub-pixels display the display gray scale, so that the effect of adjusting the display picture of the sub-pixels is achieved, the crosstalk phenomenon of the display picture is improved, and the display effect of the display picture is improved.

It should be noted that the crosstalk phenomenon is caused by the capacitive coupling effect, when the TFT is turned on, the source line (data line) sends the data voltage to the pixel capacitor, and due to the capacitive coupling effect, the voltage of the common electrode may suddenly change at this time, when the voltage difference of the positive and negative polarities in a row is the same, the voltage of the common electrode may be cancelled out, and there is no influence on the voltage of the common electrode, but when the voltage difference of the positive and negative polarities in a row is too large, the voltage of the common electrode may not return to the normal level before the TFT is turned off, the voltage of the common electrode deviates from the original value, and when the voltage sum of the positive polarities is too large, the VCOM increases; when the sum of the negative polarity voltage is more, the VCOM is reduced, and finally the voltage at two ends of the pixel capacitor is different from the actual requirement. One end of the pixel capacitor is the voltage of the pixel electrode, and the other end is the voltage of the common electrode. Due to the existence of crosstalk, the sub-pixels are driven by the input voltage of the display gray scale and cannot display the display gray scale, so that the actual output gray scale needs to be adjusted to display the desired display gray scale by the sub-pixels under the input voltage of the actual output gray scale.

This step is followed by: step S14: if not, the actual output gray scale of the sub-pixel is not adjusted.

The beneficial effect of this embodiment is: the display gray scale of each sub-pixel in the selected area is obtained through the time schedule controller, the display gray scale representation value of each sub-pixel in the selected area is calculated, whether the display gray scale representation value is not smaller than the set multiple of the maximum display gray scale of the sub-pixel in the selected area is judged, if yes, the input voltage of the actual output gray scale corresponding to the display gray scale is obtained, the pixel electrode of each sub-pixel in the selected area is driven based on the input voltage, the voltage on two sides of the liquid crystal layer is changed through the pixel electrode of the sub-pixel, and then the deflection angle of the liquid crystal is controlled to control the luminous flux of the liquid crystal, so that the sub-pixel reaches the display gray scale in the presence of the crosstalk phenomenon, the crosstalk phenomenon of the display picture is improved, and the display effect of the display picture is improved.

In this embodiment, the selected area may be a square block or a rectangular block, and in another embodiment, the selected area may be a row of the lcd panel.

Specifically, the present application further provides a second compensation method for a liquid crystal display panel, please refer to fig. 5, and fig. 5 is a flowchart illustrating a second embodiment of the compensation method for a liquid crystal display panel according to the present application.

As shown in fig. 5, includes:

step S51: and acquiring the display gray scale of each sub-pixel of the current row through the time sequence controller.

Since the liquid crystal display panel is line-scanned, adjusting the sub-pixels of each line can realize the adjustment of the display picture of the whole liquid crystal display panel. Wherein, the current line refers to a line which needs to be adjusted currently.

The display gray scale refers to the display brightness gray scale of the picture to be displayed by the current sub-pixel. The display gray scale includes positive gray scale data and negative gray scale data. The positive gray scale data refers to the display gray scale brightness generated by the sub-pixels through positive polarity voltage, and the negative gray scale data refers to the display gray scale brightness generated by the sub-pixels through negative polarity voltage. Therefore, the display gray scale includes the voltage polarity and the display brightness. The positive polarity voltage is a voltage greater than the common electrode (CFCOM) voltage, and the negative polarity voltage is a voltage less than the common electrode (CFCOM) voltage.

The display gray scale is obtained through a display picture, the display picture comprises display brightness required to be achieved by a plurality of pixels or sub-pixels, and the display picture required to be displayed by the liquid crystal display panel can be obtained only through enabling the pixels or the sub-pixels to achieve the required display brightness.

In this embodiment, the polarities of the voltages of the sub-pixels in two adjacent columns are opposite, that is, the liquid crystal display panel is driven in a polarity by a column inversion method. If the sub-pixels of the first column are driven with positive voltages, the sub-pixels of the second column are driven with negative voltages, and so on. In other embodiments, the liquid crystal display panel may also be dot-inverted polarity driven.

Step S52: and calculating the display gray scale representation value of each sub-pixel in the current row, and judging whether the display gray scale representation value is not less than the set multiple of the maximum display gray scale of the sub-pixels in the current row.

In one specific calculation, the method comprises the following steps: calculating the gray scale sum value of the sub-pixel of the positive gray scale data and the sub-pixel of the negative gray scale data of the current row; normalizing the gray scale sum value to obtain a display gray scale representation value; and judging whether the display gray scale representation value is not less than the set multiple of the maximum display gray scale of the sub-pixels in the current row.

For example, a display screen with a resolution of 1920 × 1080 has a bright display area of 960 × 540 in the middle and a dark display area in the rest. The display gray scale of the display bright area is +/-255, and the display gray scale of the display dark area is +/-127. Specifically, as shown in fig. 6, fig. 6 is a schematic diagram of a display screen according to the present application. Wherein each pixel comprises three sub-pixels.

Summing the display gray levels of the sub-pixels of each row of the area 1 to obtain: (+ 127) × (1920 × 3/2) + (-127) × (1920 × 3/2) =0.

Summing the display gray levels of the sub-pixels of a row of the

regions

2, 3, 4 yields: (+ 127) × (960 × 3/2) + (-127) × (960 × 3/2) + (+ 255) × (960 × 3/2) + (-0) × (960 × 3/2) = +367200.

As can be seen from both fig. 6 and the calculation results, crosstalk phenomenon occurs in the display screens of the sub-pixels in the

regions

2, 3, and 4, and particularly, the

regions

3 and 4 are affected by the region 2, and the display is significantly brighter.

The gray scale sum value when all the sub-pixels of the current row display the maximum display gray scale is the maximum sum value, and the maximum sum value is as follows: (+ 255) × (1920 × 3/2) + (-0) × (960 × 3/2) = +734400. The ratio of the gray scale sum value to the maximum sum value is a normalized value, and the normalized value is as follows: +367200/+734400=0.5. The gray scale characterization value is displayed to be 0.5 × 255=127.5.

In other embodiments, the display gray scale characterization value may also be an average value of display gray scales of each sub-pixel of the current row. Taking the above example as a calculation basis, the display gray scale representation value is equal to the gray scale sum divided by the number of sub-pixels: + 367200/(1920 × 3/2) = +127.5.

In this embodiment, the multiple is set to be not less than 0.2, that is, when the display gray scale characterization value is greater than or equal to 0.2 of the maximum display gray scale of the sub-pixels in the current row, it indicates that the display gray scale characterization value is different from the maximum display gray scale, and the sub-pixels in the current row are greatly affected by the sub-pixels of the maximum display gray scale (crosstalk phenomenon), so that the sub-pixels need to be adjusted.

In the above example, the display gray scale representation values of the sub-pixels in the

regions

2, 3, and 4 are obviously greater than 0.2 times of the maximum display gray scale of the sub-pixels in the current row, and the ratio of the display gray scale representation value to the maximum display gray scale of the sub-pixels in the current row is calculated to be 0.5.

Step S53: if yes, the input voltage of the actual output gray scale corresponding to the display gray scale is obtained, the pixel electrodes of the sub-pixels of the current row are driven based on the input voltage, the light transmission quantity of the liquid crystal layer is changed through the pixel electrodes, and the sub-pixels of the current row reach the display gray scale.

The method specifically comprises the following steps: and when the display gray scale representation value is greater than or equal to the set multiple of the maximum display gray scale of the sub-pixels in the current row, calculating to obtain an adjustment value of the display gray scale according to the display gray scale representation value and the maximum display gray scale. In one embodiment, the adjustment value is a ratio of the display gray scale characterization value to the maximum display gray scale. In other embodiments, the adjustment value may be a normalized value, and the like, and is not limited herein. The adjustment value is a value capable of reflecting the corresponding relationship between the display gray scale representation value and the maximum display gray scale.

The method specifically comprises the following steps: acquiring a gray scale adjustment table of the current liquid crystal display panel; searching the actual output gray scale of each sub-pixel from a gray scale adjusting table according to the display gray scale and the adjusting value; and driving the pixel electrode of each sub-pixel based on the input voltage corresponding to the actual output gray scale so as to change the light flux of the liquid crystal layer through the pixel electrode and enable each sub-pixel of the current row to reach the display gray scale.

The gray scale adjustment table is a table which is established in advance and can reflect the relationship among the adjustment value, the originally displayed display gray scale and the adjusted actual output gray scale. The gray scale adjustment table can be adjusted by testing cross talk improvement condition by using an instrument, and is related to the condition that the current liquid crystal display panel is influenced by the cross talk. Different liquid crystal display panels are affected by crosstalk in different situations, some of the liquid crystal display panels are affected greatly, and some of the liquid crystal display panels are affected slightly, so that gray scale adjustment tables of the different liquid crystal display panels are different.

Judging whether the display gray scale is in a gray scale adjusting table; if so, directly acquiring an actual output gray scale corresponding to the display gray scale and the adjustment value from the gray scale adjustment table; if not, the actual output gray scale corresponding to the display gray scale and the adjustment value is calculated through a linear interpolation method. Specifically, a first display gray scale and a second display gray scale adjacent to the display gray scale are searched from a gray scale adjustment table, a first output gray scale is searched from the gray scale adjustment table according to the first display gray scale and an adjustment value, a second output gray scale is searched from the gray scale adjustment table according to the second display gray scale and the adjustment value, and an actual output gray scale corresponding to the display gray scale between the first display gray scale and the second display gray scale is calculated by utilizing a linear relation between the first display gray scale and the first output gray scale and a linear relation between the second display gray scale and the second output gray scale, namely the display gray scale and the actual output gray scale meet the linear relation.

Specifically, the present application further discloses a gray level adjustment table, please refer to the following table:

in this embodiment, the X value is an absolute value of a ratio of the display gray scale representation value to the maximum display gray scale. In other embodiments, the X value is a ratio of the display gray scale characterization value to the maximum display gray scale, and includes positive and negative, wherein the gray scale adjustment of positive and negative X is the same, which is not limited herein.

As can be seen from the above table, the actual output gray level of + -255 gray levels of the sub-pixels of the region 2 is + -241, while the actual output gray levels of the region 3 and the region 4 are calculated from (64, 51) and (128, 111), the actual output gray level of-127 gray level is-110 gray level, and the actual output gray level of +127 gray level is +110 gray level.

Generally, when the input voltage corresponding to the actual output gray scale is normally driving the pixel electrode of the sub-pixel, the sub-pixel can display the actual output gray scale. However, due to the existence of the crosstalk phenomenon, the sub-pixels display the display gray scale, so that the effect of adjusting the display picture of the sub-pixels is achieved, the crosstalk phenomenon of the display picture is improved, and the display effect of the display picture is improved.

This step is followed by: step S54: if not, the actual output gray scale of the sub-pixel is not adjusted.

The beneficial effect of this embodiment is: the display gray scale of each sub-pixel of the current row is obtained through the time sequence controller, the display gray scale representation value of each sub-pixel of the current row is calculated, whether the display gray scale representation value is not smaller than the set multiple of the maximum display gray scale of the sub-pixel in the current row is judged, if yes, the input voltage of the actual output gray scale corresponding to the display gray scale is obtained, the pixel electrode of each sub-pixel of the current row is driven based on the input voltage, the voltage on two sides of the liquid crystal layer is changed through the pixel electrode of the sub-pixel, and then the deflection angle of the liquid crystal is controlled to control the luminous flux of the liquid crystal, so that the sub-pixel reaches the display gray scale in the presence of crosstalk, the crosstalk phenomenon of a display picture is improved, and the display effect of the display picture is improved.

In other embodiments, the grouping adjustment may also be performed, specifically including: dividing each sub-pixel of the selected area into a plurality of pixel groups; acquiring the display gray scale of each pixel group in the selected area through a time sequence controller; calculating a display gray scale representation value of each pixel group in the selected area, and judging whether the display gray scale representation value is not less than a set multiple of the maximum display gray scale of the pixel group in the selected area; if yes, acquiring input voltage of actual output gray scale of each pixel group, and driving the pixel electrode of each pixel group in the selected area based on the input voltage so as to change the light transmission quantity of the liquid crystal layer through the pixel electrode and enable each pixel group in the selected area to achieve display gray scale. And will not be described in detail herein.

Fig. 7 is a schematic circuit diagram of a liquid crystal display panel, and fig. 7 is a schematic circuit structure diagram of an embodiment of a control circuit of a liquid crystal display panel according to the present application. As shown in fig. 7, the liquid crystal display panel control circuit includes a timing controller (TCON IC) 101, a gamma controller (P-gamma IC) 102, a source driver (source driver) 103, and a liquid crystal display panel (panel) 104.

The timing controller 101 is electrically connected to the source driver 103, and the timing controller 101 is configured to monitor a display gray scale to be displayed by the liquid crystal display panel, determine whether an input voltage of each sub-pixel of the display panel needs to be compensated according to the display gray scale, and input a voltage control signal to the source driver 103 when the input voltage of each sub-pixel needs to be compensated.

The gamma controller 102 is electrically connected to the source driver 103 and the liquid crystal display panel 104, respectively, and the gamma controller 102 inputs a gamma signal to the source driver 103 and a Vcom signal to the liquid crystal display panel 104. Vcom is a reference voltage of the pixel electrode, also referred to as a voltage of the common electrode (CF-com).

The source driver 103 is electrically connected to the liquid crystal display panel 104, and the source driver 103 receives the voltage control signal of the timing controller 101 and the gamma signal of the gamma controller 102 to convert the digital signal of the voltage control signal into an analog signal and transmit the analog signal of the voltage control signal to each sub-pixel of the liquid crystal display panel 104.

In this embodiment, the display gray scale of each sub-pixel in the selected region is obtained by the timing controller 101, the display gray scale representation value of each sub-pixel in the selected region is calculated according to the display gray scale of each sub-pixel, and whether the display gray scale representation value is not less than the set multiple of the maximum display gray scale of the sub-pixel in the selected region is determined, if yes, the input voltage of the actual output gray scale corresponding to the display gray scale is obtained. The timing controller 101 transmits the input voltage to the source driver 103, and the gamma controller 102 inputs a gamma signal to the source driver 103 to convert a digital signal of the input voltage into an analog signal. The source driver 103 transmits the analog signal of the input voltage to each sub-pixel of the selected area of the liquid crystal display panel 104 to drive/compensate the pixel electrode of each sub-pixel of the selected area based on the input voltage to adjust the input voltage of the pixel electrode. Meanwhile, the gamma controller 103 inputs a common voltage (Vcom), which is a voltage of the common electrode and is also referred to as a reference voltage, to the pixels of the liquid crystal display panel 104. In the present embodiment, the common voltage does not change. The voltage difference at two sides of the liquid crystal layer is changed by changing the input voltage (also writing voltage) of the pixel electrode of each sub-pixel and not changing the voltage of the common electrode, so that the deflection angle of the liquid crystal is controlled to control the luminous flux of the liquid crystal, each sub-pixel achieves the display gray scale to be displayed, the crosstalk phenomenon of the display picture is improved, and the display effect of the display picture is improved.

Please refer to fig. 8, in which fig. 8 is a schematic circuit diagram of an OP (operational amplifier) compensation prior embodiment. As shown in fig. 8, a Vcom signal is collected from the liquid crystal display panel as a first input terminal 81, a Vcom signal is collected from the P-gamma IC terminal as a second input terminal 82, and the first input terminal 81 is electrically connected to the inverting input terminal of the operational amplifier OP through a first capacitor C1 and a first resistor R1. The inverting input terminal of the operational amplifier OP is electrically connected to the output terminal of the operational amplifier OP through the second resistor R2. The inverting input of the operational amplifier OP is also connected to ground.

The non-inverting input terminal of the operational amplifier OP is electrically connected to the second input terminal 82 through the third resistor R3. The non-inverting input terminal of the operational amplifier OP is further electrically connected to the power supply VAA and grounded through the second capacitor C2. The second capacitor C2 is a filter capacitor or a voltage stabilizing capacitor, and is used for ensuring the stability of the collected input voltage of the second input terminal 82.

The input terminal of the operational amplifier OP inputs the compensated Vcom signal into the liquid crystal display panel through the fourth resistor R4. The fourth resistor R4 is a current-limiting resistor, and is used to prevent the output current from being too large to cause heat generation.

In the prior embodiment, the ratio of the first resistor R1 and the second resistor R2 reflects the amplification factor of the operational amplifier OP, and the larger R1/R2 is, the larger the amplification factor of OP is.

Taking the line scan as an example, as can be seen from fig. 8, the existing method using OP compensation includes: collecting Vcom signals of a current line and Vcom signals output by a P-gamma IC end 82 from the liquid crystal display panel, and comparing; when the Vcom voltage is coupled to increase, the operational amplifier reversely outputs a value less than Vcom, and outputs the value less than Vcom to the liquid crystal display panel at the next line scanning for offsetting the change of Vcom.

Because the OP compensation is realized by collecting the in-plane Vcom signal and then carrying out OP reverse compensation, when the values of the in-plane wiring R (resistance) and C (capacitance) are larger, the OP compensation has larger delay, and the effect of timely compensation cannot be achieved.

The P-gamma IC in the application directly inputs Vcom signals into the liquid crystal display panel, and circuits such as OP, a peripheral resistor R, a capacitor C and the like are omitted, so that a compensation circuit is simplified, and the delay of compensation is eliminated. Specifically, referring further to fig. 9, fig. 9 is a simplified circuit diagram of the embodiment of fig. 7. As shown in fig. 9, the gamma controller 102 is electrically connected to the liquid crystal display panel 104 through a resistor R to input a common voltage Vcom signal to the liquid crystal display panel 104. Compared with fig. 8, the op and its peripheral circuits are omitted, eliminating the delay of compensation.

Fig. 10 is a schematic structural diagram of an embodiment of the liquid crystal display panel according to the present application. As shown in fig. 10, the liquid crystal display panel includes: the liquid crystal display panel comprises an array substrate 71, a color filter substrate 72 and a liquid crystal layer 73 positioned between the array substrate 71 and the color filter substrate 72. The array substrate 71 is provided with a pixel electrode 711, the color filter substrate 72 is provided with a common electrode 721, the pixel electrode 711 and the common electrode 721 form a pixel capacitor, and an electric field formed between the pixel electrode 711 and the common electrode 721 changes to deflect the liquid crystal layer 73 to transmit light, so that a picture is displayed.

The array substrate 71 includes a plurality of sub-pixels, each sub-pixel includes a pixel electrode 711, that is, the array substrate 71 is provided with a plurality of pixel electrodes 711, and the common electrode 721 is the entire surface of the color filter substrate 72 and is a whole plate.

The voltage change on the pixel electrode 711 affects the entire panel voltage on the common electrode 721 through the pixel capacitive coupling effect, and then is fed back to the adjacent pixel electrode 711 through the common electrode 721, so that the adjacent pixel electrode 711 deviates from the voltage corresponding to the original display gray scale, and the adjacent pixel deviates from the original display gray scale, which is the occurrence process of the crosstalk phenomenon.

In this embodiment, the liquid crystal display panel further includes a timing controller 74, wherein the timing controller 74 controls the driving voltage on the pixel electrode 711 through the data line, so as to change the voltages on the two sides of the liquid crystal layer 73 through the pixel electrode 711, and further control the deflection angle of the liquid crystal layer 73 to control the light flux thereof, so that the sub-pixels can achieve the desired display gray scale in the presence of the crosstalk phenomenon, thereby improving the crosstalk phenomenon of the display frame and further improving the display effect of the display frame.

Specifically, the time sequence controller is used for acquiring the display gray scale of each sub-pixel in the selected area; the display gray scale comprises positive gray scale data and negative gray scale data; calculating a display gray scale representation value of each sub-pixel in the selected area, and judging whether the display gray scale representation value is not less than a set multiple of the maximum display gray scale of the sub-pixel in the selected area; the display gray scale representation value represents the whole level of the display gray scale of the selected area; if so, acquiring an input voltage of an actual output gray scale corresponding to the display gray scale, and driving the pixel electrode of each sub-pixel in the selected area based on the input voltage so as to change the light transmission quantity of the liquid crystal layer through the pixel electrode and enable each sub-pixel in the selected area to achieve the display gray scale.

The beneficial effects of this embodiment: the input voltage of the pixel electrode is controlled by the time schedule controller, the voltages at two sides of the liquid crystal are changed by the pixel electrode, and then the deflection angle of the liquid crystal is controlled to control the luminous flux of the liquid crystal, so that the sub-pixel can also achieve the desired display gray scale in the presence of the crosstalk phenomenon, the crosstalk phenomenon of the display picture is improved, and the display effect of the display picture is improved.

The above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of the present application.

Claims

1. A compensation method of a liquid crystal display panel, wherein the liquid crystal display panel comprises a plurality of sub-pixels arranged in an array, is characterized by comprising the following steps:

acquiring the display gray scale of each sub-pixel in the selected area through a time sequence controller; wherein the display gray scale comprises positive gray scale data and negative gray scale data;

calculating a display gray scale representation value of each sub-pixel in a selected area, and judging whether the display gray scale representation value is not less than a set multiple of the maximum display gray scale of the sub-pixel in the selected area; wherein the display gray scale characterization value characterizes an overall level of display gray scale of the selected region;

if so, acquiring an input voltage of an actual output gray scale corresponding to the display gray scale, and driving the pixel electrode of each sub-pixel of the selected area based on the input voltage so as to change the light transmission quantity of the liquid crystal layer through the pixel electrode and enable each sub-pixel of the selected area to reach the display gray scale.

2. The compensation method for LCD panel according to claim 1, wherein the selected area is a current row;

the step of obtaining the display gray scale of each sub-pixel of the selected area through the time sequence controller comprises the following steps:

acquiring the display gray scale of each sub-pixel of the current row;

the step of calculating the display gray scale representation value of each sub-pixel in the selected area and judging whether the display gray scale representation value is not less than the set multiple of the maximum display gray scale of the sub-pixel in the selected area comprises the following steps:

calculating a display gray scale representation value of each sub-pixel of the current row, and judging whether the display gray scale representation value is larger than a set multiple of the maximum display gray scale of the sub-pixel of the current row;

the step of acquiring an input voltage of an actual output gray scale corresponding to the display gray scale, and driving the pixel electrode of each sub-pixel of the selected area based on the input voltage to change the amount of light passing through the liquid crystal layer by the pixel electrode, so that each sub-pixel of the selected area reaches the display gray scale includes:

acquiring input voltage of each sub-pixel of the current row, and driving a pixel electrode of each sub-pixel of the current row based on the input voltage so as to change the light flux of a liquid crystal layer through the pixel electrode and enable each sub-pixel of the current row to reach the display gray scale.

3. The method as claimed in claim 1, wherein the step of calculating the display gray scale characterization value of each sub-pixel in the selected region and determining whether the display gray scale characterization value is not less than a set multiple of the maximum display gray scale of the sub-pixel in the selected region comprises:

calculating gray scales and values of the sub-pixels of the positive gray scale data and the sub-pixels of the negative gray scale data of the selected area;

and carrying out normalization processing on the gray scale sum value to obtain the display gray scale representation value.

4. The method as claimed in claim 3, wherein the step of calculating the display gray scale characterization value of each sub-pixel in the selected region and determining whether the display gray scale characterization value is not less than a predetermined multiple of the sub-pixel with the largest display gray scale in the selected region comprises:

calculating the sum of the maximum display gray scales of all the sub-pixels in the current area to obtain a maximum sum;

calculating the ratio of the absolute value of the gray scale sum value to the maximum sum value to obtain the multiple of the display gray scale representation value and the maximum display gray scale of the sub-pixels in the selected area;

judging whether the multiple is not less than the set multiple or not;

wherein the multiple is between 0 and 1, and the set multiple is not less than 0.2.

5. The method according to claim 1, wherein if yes, acquiring an input voltage of an actual output gray level corresponding to the display gray level, and driving a pixel electrode of each sub-pixel of the selected area based on the input voltage to change an amount of light passing through a liquid crystal layer by the pixel electrode so that each sub-pixel of the selected area reaches the display gray level, the method comprising:

and if so, calculating to obtain an adjustment value of the display gray scale according to the display gray scale representation value and the maximum display gray scale.

6. The method according to claim 5, wherein the step of obtaining an input voltage of an actual output gray scale corresponding to the display gray scale and driving the pixel electrode of each sub-pixel of the selected area based on the input voltage to change an amount of light passing through the liquid crystal layer by the pixel electrode so that each sub-pixel of the selected area reaches the display gray scale comprises:

acquiring a gray scale adjustment table of the current liquid crystal display panel;

searching the actual output gray scale of each sub-pixel from the gray scale adjustment table according to the display gray scale and the adjustment value;

and driving the pixel electrode of each sub-pixel based on the input voltage corresponding to the actual output gray scale so as to change the light transmission quantity of the liquid crystal layer through the pixel electrode and enable each sub-pixel in the selected area to reach the display gray scale.

7. The compensation method as claimed in claim 6, wherein the step of searching the actual output gray scale of each sub-pixel from the gray scale adjustment table according to the display gray scale and the adjustment value comprises:

judging whether the display gray scale exists in the gray scale adjusting table or not;

if not, acquiring a first display gray scale and a second display gray scale adjacent to the display gray scale, a first output gray scale corresponding to the first display gray scale and a second output gray scale corresponding to the second display gray scale from the gray scale adjustment table based on the display gray scale of the sub-pixels and the adjustment value, and calculating by using a linear interpolation method to obtain the actual output gray scale corresponding to the display gray scale;

and if so, searching the gray scale adjustment table according to the display gray scale and the set multiple to obtain the actual output gray scale of the sub-pixel.

8. The method as claimed in claim 1, further comprising, after the step of determining whether the display gray scale characterization value is not less than a set multiple of a maximum display gray scale of the sub-pixels in the selected region:

if not, the actual output gray scale of the sub-pixel is not adjusted.

9. The compensation method for liquid crystal display panel according to claim 1, further comprising:

dividing each sub-pixel of the selected area into a plurality of pixel groups;

the step of obtaining the display gray scale of each sub-pixel of the selected area through the time schedule controller comprises the following steps:

acquiring the display gray scale of each pixel group in a selected area through a time sequence controller;

calculating a display gray scale representation value of each pixel group in a selected area, and judging whether the display gray scale representation value is not less than a set multiple of the maximum display gray scale of the pixel group in the selected area;

if so, acquiring an input voltage of an actual output gray scale corresponding to the display gray scale, and driving the pixel electrode of each sub-pixel of the selected area based on the input voltage so as to change the light flux of the liquid crystal layer through the pixel electrode and enable each sub-pixel of the selected area to reach the display gray scale, wherein the step comprises the following steps of:

if yes, acquiring an input voltage of an actual output gray scale of each pixel group, and driving the pixel electrode of each pixel group in the selected area based on the input voltage so as to change the light transmission quantity of the liquid crystal layer through the pixel electrode and enable each pixel group in the selected area to reach the display gray scale.

10. The liquid crystal display panel regulating circuit is characterized by comprising: the liquid crystal display comprises a time sequence controller, a source electrode driver electrically connected with the time sequence controller, a liquid crystal display panel electrically connected with the source electrode driver, and a gamma controller electrically connected with the source electrode driver and the liquid crystal display panel;

the time sequence controller is used for acquiring the display gray scale of each sub-pixel in the selected area; calculating a display gray scale representation value of each sub-pixel in a selected area, and judging whether the display gray scale representation value is not less than a set multiple of the maximum display gray scale of the sub-pixel in the selected area; if so, acquiring an input voltage of an actual output gray scale corresponding to the display gray scale, and transmitting the input voltage to the source driver;

the source driver is used for receiving an input voltage of the time sequence controller and driving the pixel electrode of each sub-pixel of the selected area in the liquid crystal display panel based on the input voltage;

the gamma controller simultaneously supplies a gamma signal to the source driver and inputs a constant common voltage to a common electrode of the liquid crystal display panel.

11. The liquid crystal display panel comprises an array substrate, a color film substrate and a liquid crystal layer positioned between the array substrate and the color film substrate, wherein the array substrate comprises a plurality of sub-pixels which are arranged in an array manner, each sub-pixel comprises a pixel electrode, and the pixel electrode and a common electrode on the color film substrate form a pixel capacitor so as to control the deflection of the liquid crystal layer;

the time sequence controller is used for acquiring the display gray scale of each sub-pixel in the selected area; wherein the display gray scale comprises positive gray scale data and negative gray scale data; calculating a display gray scale representation value of each sub-pixel in a selected area, and judging whether the display gray scale representation value is not less than a set multiple of the maximum display gray scale of the sub-pixel in the selected area; wherein the display gray scale characterization value characterizes an overall level of display gray scale of the selected region; and if so, acquiring input voltage of actual output gray scale corresponding to the display gray scale, and driving the pixel electrode of each sub-pixel of the selected area based on the input voltage so as to change the light flux of the liquid crystal layer through the pixel electrode and enable each sub-pixel of the selected area to reach the display gray scale.