CN115223512B - Liquid crystal display panel and compensation method thereof - Google Patents
Liquid crystal display panel and compensation method thereof Download PDFInfo
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- 241001270131 Agaricus moelleri Species 0.000 claims abstract description 67
- 239000000758 substrate Substances 0.000 claims description 22
- 239000003990 capacitor Substances 0.000 claims description 16
- 230000000694 effects Effects 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 11
- 230000008878 coupling Effects 0.000 description 9
- 238000010168 coupling process Methods 0.000 description 9
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- 238000010606 normalization Methods 0.000 description 6
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- 230000001808 coupling effect Effects 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3614—Control of polarity reversal in general
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0242—Compensation of deficiencies in the appearance of colours
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- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
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- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
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, each sub-pixel comprises a pixel electrode, the pixel electrode and a common electrode form a pixel capacitance, and the compensation method of the liquid crystal display panel comprises the following steps: acquiring the display gray scale of each sub-pixel of the current row through a time sequence controller; calculating display gray scales of all the sub-pixels of the current line based on the display gray scales of all the sub-pixels of the current line to obtain display gray scales and values of all the sub-pixels of the current line and adjustment values corresponding to the display gray scales and values; judging whether the adjustment value is larger than a set value; if so, acquiring a voltage compensation value corresponding to the display gray scale and the value of the current line according to the adjustment value, and adjusting the output voltage of the common electrode based on the voltage compensation value so as to adjust the display gray scale of all the sub-pixels of the current line through the output voltage of the common electrode. Through the structure, the color cast phenomenon of the display picture is improved, and the display effect of the display picture is further improved.
Description
Technical Field
The present application relates to the field of display panels, and in particular, to a liquid crystal display panel and a compensation method thereof.
Background
As a main display panel in the market, a liquid crystal display (Liquid Crystal Display, LCD) is a main display panel in the market, and the LCD deflects liquid crystal by different angles to realize different transmittance through an electric field formed by a voltage difference between a pixel electrode and a common electrode, thereby realizing display of different gray scales.
However, since the voltage of the data line (Source line) is continuously refreshed to update the image, and in order to prevent polarization of the liquid crystal, the liquid crystal is driven to deflect by changing the positive and negative polarities, the positive and negative polarities are referenced to a common electrode (CFCOM), a positive polarity voltage higher than the common electrode, and a negative polarity voltage lower than the common electrode. Because of the continuous 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, so that the deflection angle of the liquid crystal is affected, and the gray scale display of the picture is affected.
Under special pictures, the picture color cast phenomenon can be caused under the condition that the common electrode is extremely seriously coupled.
Disclosure of Invention
The application mainly solves the technical problem of providing a liquid crystal display panel and a compensation method thereof so as to improve the color cast phenomenon of a display picture and further improve the display effect of the display picture.
In order to solve the above problems, the present application provides a compensation method of a liquid crystal display panel, wherein the liquid crystal display panel includes a plurality of sub-pixels arranged in an array, each of the sub-pixels includes a pixel electrode, the pixel electrode and a common electrode form a pixel capacitance, the compensation method of the liquid crystal display panel includes: acquiring the display gray scale of each sub-pixel of the current row through a time sequence controller; calculating display gray scales of all the sub-pixels of the current line based on the display gray scales of all the sub-pixels of the current line, and obtaining display gray scales and values of all the sub-pixels of the current line and adjustment values corresponding to the display gray scales and values; judging whether the adjustment value is larger than a set value or not; if so, acquiring a voltage compensation value corresponding to the display gray scale and the display gray scale of the current row according to the adjustment value, and adjusting the output voltage of the common electrode based on the voltage compensation value so as to adjust the display gray scale of all the sub-pixels of the current row through the output voltage of the common electrode.
Therefore, due to the existence of the capacitive coupling effect, the actual display gray scale of each sub-pixel deviates from the original display gray scale, the gray scale adjustment value of the current row is calculated by the time sequence controller according to the gray scale data of each sub-pixel of the current row, the voltage of the common electrode connected with the pixel electrode of each sub-pixel is adjusted according to the adjustment value, and the display gray scale of the sub-pixel of the current row is adjusted by the output voltage of the common electrode, so that the display gray scale of each sub-pixel reaches the expected display gray scale.
Wherein the display gray scale includes positive gray scale data and negative gray scale data; the step of calculating the display gray scale sum value of all the sub-pixels of the current line and the adjustment value corresponding to the display gray scale sum value based on the display gray scale of each sub-pixel of the current line comprises the following steps: calculating the display gray scale sum of the sub-pixels of the positive gray scale data and the sub-pixels of the negative gray scale data of the current line to obtain the display gray scale sum value; and carrying out normalization processing on the display gray scale and the display gray scale value to obtain the adjustment value.
Therefore, the display gray scale comprises positive gray scale data and negative gray scale data, the sum of the display gray scales of the current line is calculated through the display gray scale, the overall display level of the current line is obtained, and the voltage adjustment values of all the sub-pixels of the current line are obtained according to the overall display level.
The step of normalizing the display gray scale and the value to obtain the adjustment value includes: obtaining the maximum display gray level and the minimum display gray level of the subpixels of the current row; calculating to obtain the maximum sum value of the display gray scales of all the sub-pixels of the current row based on the maximum display gray scale and the minimum display gray scale; and normalizing the display gray scale sum value by using the display gray scale maximum sum value to obtain the adjustment value.
Therefore, the maximum sum value of the display gray scale is calculated, and the normalization processing is carried out on the display gray scale and the value by utilizing the maximum sum value of the display gray scale, so that the adjustment value is obtained.
The step of obtaining a voltage compensation value corresponding to the display gray scale and the value of the current row according to the adjustment value, and adjusting the output voltage of the common electrode based on the voltage compensation value so as to adjust the display gray scale of all the sub-pixels of the current row through the output voltage of the common electrode comprises the following steps: acquiring a compensation voltmeter of the public electrode; obtaining the voltage compensation value corresponding to the adjustment value from the compensation voltmeter according to the adjustment value; and adjusting the voltage of the common electrode based on the voltage compensation value to adjust the display gray scale of all the sub-pixels of the current row through the output voltage of the common electrode.
Thus, the adjusted output voltage of the common electrode is obtained by the compensation voltmeter.
The step of obtaining the voltage compensation value corresponding to the adjustment value from the compensation voltmeter according to the adjustment value includes: judging whether the adjustment value exists in the compensation voltmeter or not; if not, rounding the adjustment value, and obtaining the voltage compensation value from the compensation voltage table by using the rounded adjustment value; if yes, searching from the compensation voltage table according to the adjustment value to obtain the voltage compensation value.
Therefore, the voltage compensation value is accurately obtained from the compensation voltmeter by judging whether the adjustment value is in the compensation voltmeter.
Wherein, after the step of judging whether the adjustment value is greater than the set value, the method further comprises: if not, the output voltage of the common electrode is not adjusted.
Therefore, if no, the display gray level deviation is not large, and no adjustment is performed.
The compensation method of the liquid crystal display panel further comprises the following steps: acquiring the display gray scale of each sub-pixel of the next row through a time sequence controller; calculating display gray scales of all the sub-pixels in the next row based on the display gray scales of all the sub-pixels in the next row, and obtaining adjustment values corresponding to the display gray scales and the adjustment values; judging whether the adjustment value is larger than a set value or not; and if the display gray scale is larger than the display gray scale, acquiring a voltage compensation value corresponding to the display gray scale and the display gray scale of the next row according to the adjustment value, and adjusting the output voltage of the common electrode based on the voltage compensation value so as to adjust the display gray scale of all the sub-pixels of the next row through the output voltage of the common electrode.
Therefore, after charging all the subpixels of the current row is completed, the display gray scale and the value of all the subpixels of the next row are obtained before charging all the subpixels of the next row, the voltage compensation value of the common electrode corresponding to all the subpixels of the next row is obtained according to the display gray scale and the value of the next row, and the output voltage of the common electrode is regulated when all the subpixels of the next row are charged, so that the charging voltage of all the subpixels of the next row reaches the preset voltage, and the display gray scale of all the subpixels of the next row is regulated.
Wherein, the polarities of the display gray scales of two adjacent sub-pixels are opposite.
Therefore, the polarity inversion scheme of the display gray scale of the sub-pixel is defined.
The liquid crystal display panel further comprises a push-pull circuit, and the push-pull circuit is connected with the common electrode to improve the output current of the common electrode.
Therefore, the normal output of the public electrode is ensured by externally connecting a push-pull circuit.
The application also provides a liquid crystal display panel regulating circuit, which is characterized by comprising: the liquid crystal display comprises a time sequence controller, a source electrode driver, a liquid crystal display panel and a gamma controller, wherein the source electrode driver is electrically connected with the time sequence controller, the liquid crystal display panel is electrically connected with the source electrode driver, and the gamma controller is electrically connected with the time sequence controller, the source electrode driver and the liquid crystal display panel; the time schedule controller is used for obtaining the display gray scale of each sub-pixel of the current row; calculating display gray scales of all the sub-pixels of the current line based on the display gray scales of all the sub-pixels of the current line, and obtaining display gray scales and values of all the sub-pixels of the current line and adjustment values corresponding to the display gray scales and values; judging whether the adjustment value is larger than a set value or not; if the display gray scale sum value is larger than the display gray scale sum value, acquiring a voltage compensation value corresponding to the display gray scale sum value of the current line according to the adjustment value; the gamma controller obtains the voltage compensation values of all the sub-pixels in the current row, and adjusts the output voltage of the common electrode of the liquid crystal display panel based on the voltage compensation values so as to adjust the display gray scale of all the sub-pixels in the current row through the output voltage of the common electrode.
Therefore, the application obtains the adjustment value of the common voltage through the time sequence controller, and adjusts the display gray scale of each sub-pixel through the voltage of the common electrode of the gamma controller.
The application also provides a liquid crystal display panel, which comprises an array substrate, a color film substrate and liquid crystal 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, each sub-pixel comprises a pixel electrode, each pixel electrode and a common electrode on the color film substrate form a pixel capacitance of the sub-pixel, the deflection of the liquid crystal is controlled by the pixel capacitance, and the time schedule controller is respectively connected with the pixel electrode and the common electrode so as to control the output voltage of the pixel electrode and the common electrode; the time schedule controller is used for obtaining the display gray scale of each sub-pixel of the current row; calculating display gray scales of all the sub-pixels of the current line based on the display gray scales of all the sub-pixels of the current line, and obtaining display gray scales and values of all the sub-pixels of the current line and adjustment values corresponding to the display gray scales and values; judging whether the adjustment value is larger than a set value or not; if the display gray scale is larger than the display gray scale, acquiring a voltage compensation value corresponding to the display gray scale and the display gray scale of the current row according to the adjustment value, and adjusting the output voltage of the common electrode based on the voltage compensation value so as to adjust the display gray scales of all the sub-pixels of the current row through the output voltage of the common electrode.
Therefore, the voltage of the common electrode is regulated by the time sequence controller, so that the pixel electrode of the sub-pixel is influenced by the pixel capacitance of the sub-pixel, and the normal charge quantity of the pixel electrodes of all the sub-pixels in the current row is ensured, so that all the sub-pixels in the current row reach the normal display gray level, and the color cast phenomenon is avoided.
The beneficial effects of the application are as follows: acquiring the display gray scale of each sub-pixel of the current row through a time sequence controller; calculating display gray scales of all the sub-pixels of the current line based on the display gray scales of all the sub-pixels of the current line to obtain display gray scales and values of all the sub-pixels of the current line and adjustment values corresponding to the display gray scales and values; judging whether the adjustment value is larger than a set value; if so, acquiring a voltage compensation value corresponding to the display gray scale and the value of the current line according to the adjustment value, and adjusting the output voltage of the common electrode based on the voltage compensation value so as to adjust the display gray scales of all the sub-pixels of the current line through the output voltage of the common electrode, thereby avoiding the color cast phenomenon of the display picture and further improving the display effect of the display picture.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a first embodiment of a compensation method of a liquid crystal display panel according to the present application;
FIG. 2 is a schematic diagram illustrating a polar arrangement of sub-pixels according to an embodiment of the present application;
FIG. 3 is a flowchart of the step S12 according to an embodiment of the present application;
FIG. 4 is a schematic structural diagram of an embodiment of the step S13 of the present application;
FIG. 5 is a schematic circuit diagram of an embodiment of a control circuit of a liquid crystal display panel according to the present application;
FIG. 6 is a schematic diagram of the circuit structure of the OP compensation conventional embodiment;
FIG. 7 is a simplified circuit schematic of one embodiment of FIG. 5;
fig. 8 is a schematic structural diagram of an embodiment of a liquid crystal display panel according to the present application.
81 array base plate; 82 color film substrate; 83 a liquid crystal layer; 84 timing controller; 811 a pixel electrode; 821 common electrode.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terminology used in the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in 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" generally includes at least two, but does not exclude the case of at least one.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are 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 phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present application, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), 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 may be included in at least one embodiment of the application. The appearances of such phrases 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. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Referring to fig. 1, fig. 1 is a schematic flow chart of 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 of the current row through a time sequence controller.
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 luminance of the sub-pixel generated by the positive polarity voltage, and the negative gray scale data refers to the display gray scale luminance of the sub-pixel generated by the negative polarity voltage. Thus, 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 a plurality of pixels or sub-pixels which need to reach the display brightness, and the display picture which the liquid crystal display panel wants to display can be obtained through enabling the pixels or the sub-pixels to reach the required display brightness. The display brightness of the pixel or the sub-pixel is regulated by the voltage difference between two ends of a pixel capacitor in the sub-pixel, namely, the deflection of liquid crystal of the sub-pixel is controlled by the voltage difference between a pixel electrode and a common electrode so as to control the light passing quantity of the liquid crystal, thereby realizing the gray scale display.
In this embodiment, the polarities of the voltages of the sub-pixels of two adjacent columns are opposite, that is, the liquid crystal display panel is polarity-driven by column inversion. If the subpixels of the first column are driven with positive polarity voltages, the subpixels of the second column are driven with negative polarity voltages, and so on. In another embodiment, the liquid crystal display panel may be dot-inverted polarity driving, and in still another embodiment, frame-inverted polarity driving. Referring to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of a polarity arrangement of sub-pixels according to the present application. As shown in fig. 2, the pixel includes R, G, B three sub-pixels, which are arranged in columns, but may be arranged in rows or other arrangements in other embodiments, which are not limited herein. The voltage polarities of the two adjacent columns of sub-pixels are opposite, the first column is positive voltage, and the second column is negative voltage.
Step S12: and calculating display gray scales of all the sub-pixels of the current line and adjusting values corresponding to the display gray scales and the display gray scales based on the display gray scales of all the sub-pixels of the current line.
The method specifically comprises the following steps: and calculating the display gray scale and the display value of all the sub-pixels of the current row according to the display gray scale of each sub-pixel, and obtaining an adjustment value corresponding to the display gray scale and the display value.
In this embodiment, the adjustment value is a voltage adjustment value. In other embodiments, the adjustment value may also be a gray scale adjustment value, or the like.
In a specific calculation mode, the present step further includes steps S21 to S22. Referring to fig. 3 in particular, fig. 3 is a flow chart illustrating an embodiment of step S12 of the present application. As shown in fig. 3, step S12 includes:
step S21: and calculating the display gray scale sum of the sub-pixels of the positive gray scale data and the sub-pixels of the negative gray scale data of the current line to obtain the display gray scale sum value.
Wherein the display gray scale sum value is the sum value of the display gray scales of all the sub-pixels of the current row.
Taking the example of a resolution of 1920×1080 of the liquid crystal display panel, each row of the liquid crystal display panel includes 1920×3 sub-pixels, assuming that there are 960 pixels with display gray scale +127, 960 pixels with display gray scale-127, 960 pixels with display gray scale +255, and 960 pixels with display gray scale-0 in the current row, the display gray scales and values of all the sub-pixels in the current row are: (+127) x (960×3/2) +(-127) x (960×3/2) +(+255) x (960×3/2) +(-0) x (960×3/2) = +367200.
In other embodiments, the display gray scale sum value may be the absolute value of the sum value of the display gray scales of all the sub-pixels of the current row, which is not limited herein.
Step S22: and carrying out normalization processing on the display gray scale and the display gray scale value to obtain an adjustment value.
The method comprises the following steps: obtaining the maximum display gray level and the minimum display gray level of the subpixels of the current row; calculating to obtain the maximum sum value of the display gray levels of all the sub-pixels of the current line based on the maximum display gray level and the minimum display gray level; and carrying out normalization processing on the display gray scale sum value by using the display gray scale maximum sum value to obtain an adjustment value.
Wherein, the maximum display gray level is 255, and the minimum display gray level is 0. Calculating the maximum sum value of the display gray levels according to the maximum display gray levels and the minimum display gray levels, taking the maximum sum value of the display gray levels as 1, and carrying out normalization processing on the display gray levels and the values.
In this embodiment, a value of one row of total sub-pixel number/2×255 is taken as "1", and normalization processing is performed on the display gray scale and the value.
Taking the resolution of the liquid crystal display panel as 1920×1080 as an example, the total number of subpixels per 2×255 in one line is equal to 1920×3/2×255= 734400. If the display gray scale sum value of all the sub-pixels of the current row is +367200, the adjustment value of the current row is +3674200/734400= +0.5; if the display gray scale sum value of all the sub-pixels of the current line is-255000, the adjustment value of the current line is-255000/734400= -0.347.
In this embodiment, the adjustment value is a ratio of the display gray scale sum value to the display gray scale maximum sum value.
Step S13: and judging whether the adjustment value is larger than the set value.
Specifically, if the adjustment value is greater than the set value, it indicates that the display gray scale of the liquid crystal display panel deviates from the original display gray scale greatly, and adjustment is needed; if the adjustment value is not greater than the set value, the display gray scale of the liquid crystal display panel is smaller than the original display gray scale, and adjustment is not needed.
It should be noted that, the color shift phenomenon or the crosstalk phenomenon is caused by the capacitive coupling effect, when the TFT is turned on, a source line (data line) sends a data voltage to the pixel capacitor, due to the capacitive coupling effect, the voltage of the common electrode will generate abrupt change at this time, when the difference between the positive and negative voltages in one row is equal, the voltage of the common electrode will cancel each other, and the voltage of the common electrode will return to the original voltage, but when the difference between the positive and negative voltages in one row is too large, the voltage of the common electrode will not return to the original voltage before the TFT is turned off, the voltage of the common electrode deviates from the original value, and when the sum of the positive voltages is more, VCOM increases; when the negative polarity voltage is more, VCOM is reduced, and finally the voltage at two ends of the pixel capacitor is different from the actual demand, so that the pixel cannot achieve normal gray scale display. One end of the pixel capacitor is the voltage of the pixel electrode, and the other end is the voltage of the common electrode. The integral display picture of the liquid crystal display panel deviates from the original display picture due to the existence of the capacitive coupling phenomenon, and the color cast phenomenon is particularly shown. When the display gray scales of the R pixel and the B pixel in the RGB sub-pixels are the same and opposite to the display gray scale of the G pixel, the sum of the display gray scales of the R pixel and the B pixel of the display panel is larger than the sum of the display gray scales of the G pixel, so that the liquid crystal capacitance of each green sub-pixel becomes larger, and the whole picture is greenish, namely the color cast phenomenon. Wherein the color shift phenomenon also comprises reddening or bluing and the like.
In this embodiment, the absolute value of the set value is not less than 0.2, and in other embodiments, the set value may be set according to the lcd panel or the compensation voltmeter.
Step S14: if so, acquiring a voltage compensation value corresponding to the display gray scale and the value of the current line according to the adjustment value, and adjusting the output voltage of the common electrode based on the voltage compensation value so as to adjust the display gray scale of all the sub-pixels of the current line through the output voltage of the common electrode.
Specifically, the output voltage of the common electrode is adjusted through the time sequence controller so as to compensate the voltage of the common electrode, so that the output voltage of the common electrode can return to the normal reference voltage after charging the pixel capacitor under the capacitive coupling phenomenon, the influence of capacitive coupling on the voltage of the common electrode is reduced, and the influence of capacitive coupling on the display gray scale of the sub-pixel is reduced through the common electrode. The output voltage of the common electrode may be greater than the reference voltage, may be less than the reference voltage, or may be equal to the reference voltage.
In this embodiment, the charging voltage of the pixel electrode by the time schedule controller is unchanged, and the voltage difference between two ends of the pixel capacitor is adjusted by adjusting the voltage on the common electrode, so as to control the display gray scale of the pixel.
The present step specifically includes steps S31-33, referring to fig. 4, fig. 4 is a schematic structural diagram of an embodiment of step S14 of the present application. As shown in fig. 4, step S14 includes:
step S31: and acquiring a compensation voltmeter of the common electrode.
The compensation voltage table is a table established in advance, reflecting the relationship between the adjustment value and the compensation voltage of the common electrode.
Specifically, the application also enumerates a compensation voltmeter, please refer to the following table:
in this embodiment, the X value is a ratio of a display gray scale sum value to a display gray scale maximum sum value. The voltage compensation value of the common electrode is positive or negative, the positive value is to increase the output voltage of the common electrode, and the negative value is to decrease the output voltage of the common electrode.
In this embodiment, the X value is linearly related to the voltage compensation value, and in other embodiments, the X value and the voltage compensation value may not be linearly related, which is not limited herein. The larger the absolute value of the X value is, the larger the absolute value of the voltage compensation value is.
In this embodiment, the X value is inversely related to the voltage compensation value. Wherein, the larger the X value is, the smaller the voltage compensation value is, for example, when the X value reaches the maximum value 1, the voltage compensation value reaches the minimum value-5 (can be set); the voltage compensation value is greater when the value of X is smaller, such as when the value of X reaches a minimum value of-1, the voltage compensation value reaches a maximum value of 5 (settable).
Step S32: and obtaining a voltage compensation value corresponding to the adjustment value from the compensation voltmeter according to the adjustment value.
The step also comprises judging whether the adjustment value is in the compensation voltmeter; if yes, directly acquiring a voltage compensation value corresponding to the adjustment value from the compensation voltmeter; if not, the adjustment value in the compensation voltmeter is obtained through rounding, and the corresponding voltage compensation value is obtained according to the adjustment value.
In this embodiment, one decimal place is reserved after rounding to obtain an adjusted adjustment value.
Step S33: the voltage of the common electrode is adjusted based on the voltage compensation value to adjust the display gray scale of all the subpixels of the current row through the output voltage of the common electrode.
Specifically, the output voltage of the common electrode reduces the charge amount of the pixel electrodes of all the sub-pixels in the current row, and is influenced by capacitive coupling, so that the display gray scale of all the sub-pixels is adjusted to reach the normal display gray scale, wherein the normal display gray scale refers to the display gray scale free from the influence of the capacitive coupling.
Step S15: if not, the output voltage of the common electrode is not adjusted.
The method further comprises the following steps: acquiring the display gray scale of each sub-pixel of the next row through a time sequence controller; calculating display gray scales of all the sub-pixels of the next row based on the display gray scales of all the sub-pixels of the next row to obtain display gray scales and values of all the sub-pixels of the next row and adjustment values corresponding to the display gray scales and values; judging whether the adjustment value is larger than a set value; if the voltage compensation value is larger than the preset value, the voltage compensation value corresponding to the display gray scale and the value of the next row is obtained according to the adjustment value, and the output voltage of the common electrode is adjusted based on the voltage compensation value, so that the display gray scale of all the sub-pixels of the next row is adjusted through the output voltage of the common electrode.
Wherein the next row refers to any row other than the current row. In this embodiment, the scan line is scanned along each line, and the next line refers to the next line of the current line; if the scan line is scanned in every two rows, the next row is the downstream of the current row, which is not limited herein.
The beneficial effects of this embodiment are: acquiring the display gray scale of each sub-pixel of the current row through a time sequence controller; calculating display gray scales of all the sub-pixels of the current line based on the display gray scales of all the sub-pixels of the current line to obtain display gray scales and values of all the sub-pixels of the current line and adjustment values corresponding to the display gray scales and values; judging whether the adjustment value is larger than a set value; if so, acquiring a voltage compensation value corresponding to the display gray scale and the value of the current line according to the adjustment value, and adjusting the output voltage of the common electrode based on the voltage compensation value so as to adjust the display gray scales of all the sub-pixels of the current line through the output voltage of the common electrode to avoid the influence of capacitive coupling, thereby avoiding the color cast phenomenon of the display picture and further improving the display effect of the display picture.
The application also provides a circuit diagram of a liquid crystal display panel, referring to fig. 5, fig. 5 is a schematic circuit diagram of an embodiment of a control circuit of the liquid crystal display panel according to the application. As shown in fig. 5, 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 (Pannel) 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 level that the liquid crystal display panel wants to display, determine whether the input voltage of each sub-pixel of the display panel needs to be compensated according to the display gray level, 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 the reference voltage for the pixel electrode, also known as 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, so as to convert the digital signal of the voltage control signal into an analog signal, and send the analog signal of the voltage control signal to each sub-pixel of the liquid crystal display panel 104.
In this embodiment, the timing controller 101 obtains the display gray scale of each sub-pixel in the selected area, calculates the display gray scale representation value of each sub-pixel in the selected area according to the display gray scale of each sub-pixel, and determines 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, if so, obtains the input voltage of the actual output gray scale corresponding to the display gray scale. 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 the digital signal of the input voltage into an analog signal. The source driver 103 transmits an analog signal of the input voltage to each of the sub-pixels of the selected area of the liquid crystal display panel 104 to drive/compensate the pixel electrode of each of the sub-pixels of the selected area based on the input voltage, so as to adjust the input voltage of the pixel electrode. Meanwhile, the gamma controller 103 inputs a common voltage (Vcom), which is a voltage of a common electrode, also referred to as a reference voltage, to the pixels of the liquid crystal display panel 104. In the present embodiment, the voltage input to the pixel electrode of each sub-pixel by the timing controller 101 is not changed, and the voltage input to the common electrode of the sub-pixel by the gamma controller 102 is changed. The voltage of the common electrode of each sub-pixel is changed without changing the voltage of the pixel electrode, so that the voltage difference of two sides of the liquid crystal layer is changed, the deflection angle of the liquid crystal is further 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 a display picture is improved, and the display effect of the display picture is further improved.
The present application also provides a structure using OP (operational amplifier) compensation, referring to fig. 6, fig. 6 is a schematic diagram of a circuit structure of an OP compensation conventional embodiment. As shown in fig. 6, the Vcom signal is collected from the liquid crystal display panel as a first input terminal 61, and the Vcom signal is collected from the P-gamma IC terminal as a second input terminal 62, and the first input terminal 61 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 grounded.
The non-inverting input terminal of the operational amplifier OP is electrically connected to the second input terminal 62 through the third resistor R3. The non-inverting input terminal of the operational amplifier OP is further electrically connected to the power source 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 that the collected input voltage of the second input end 62 is stable.
The compensated Vcom signal is input into the liquid crystal display panel through the fourth resistor R4 at the input end of the operational amplifier OP. The fourth resistor R4 is a current limiting resistor, and is used for avoiding heat generated by excessive output current.
In the prior embodiment, the ratio of the first resistor R1 to the second resistor R2 reflects the amplification factor of the operational amplifier OP, and the larger the R1/R2 is, the larger the amplification factor of the OP is.
Taking line scan as an example, as can be seen from fig. 6, the existing method using OP compensation includes: collecting the Vcom signal of the current line from the liquid crystal display panel and collecting the output Vcom signal from the P-gamma IC end, and comparing; when the Vcom voltage is increased by coupling, the operational amplifier outputs a value less than Vcom in the opposite direction and outputs the value less than Vcom into the liquid crystal display panel at the next line scanning for counteracting the change of Vcom.
Because OP compensation is realized by collecting an in-plane Vcom signal and then by an OP reverse compensation mode, when the values of an in-plane wiring R (resistor) and a C (capacitor) 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 the adjusted Vcom signal into the liquid crystal display panel, and circuits such as OP, peripheral resistor R, capacitor C and the like are omitted, so that a compensation circuit is simplified, and the compensating delay is eliminated. Specifically, referring to fig. 7, fig. 7 is a simplified circuit schematic of the embodiment of fig. 5. As shown in fig. 7, 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. In comparison with fig. 6, the ops and their peripheral circuits are omitted, eliminating the delay of compensation. In this embodiment, the timing controller 101 determines that the voltage corresponding to the display gray level of the sub-pixel in the current row needs to be compensated, and transmits the compensation signal to the gamma controller 102, and the gamma controller 102 directly compensates the voltage of the common electrode of all the pixels in the current row, so as to adjust the display gray level of all the sub-pixels in the current row by the voltage of the common electrode. In the present embodiment, the timing controller 101 is also connected to the gamma controller 102 to transmit a voltage adjustment value required to adjust the common electrode to the gamma controller 102.
The application also provides a liquid crystal display panel, and fig. 8 is a schematic structural diagram of an embodiment of the liquid crystal display panel. As shown in fig. 8, the liquid crystal display panel includes: an array substrate 81, a color film substrate 82, and a liquid crystal layer 83 between the array substrate 81 and the color film substrate 82. The array substrate 81 is provided with a pixel electrode 811, the color film substrate 82 is provided with a common electrode 821, the pixel electrode 811 and the common electrode 821 form a pixel capacitance, and the liquid crystal layer 83 is deflected to pass light by the change of an electric field formed between the pixel electrode 811 and the common electrode 821, so that a picture is displayed.
The array substrate 81 includes a plurality of sub-pixels, each sub-pixel includes a pixel electrode 811, i.e., the array substrate 81 is provided with a plurality of pixel electrodes 811, and the common electrode 821 is the entire surface of the color film substrate 82 and is a whole plate.
The voltage variation on the pixel electrode 811 affects the whole panel voltage on the common electrode 821 by the pixel capacitive coupling effect, so that the voltage on the common electrode 821 deviates from the reference voltage, and the display gray scale of the sub-pixel deviates from the original display gray scale. Particularly, when the voltage of the same polarity sub-pixel is larger than the voltage of the other opposite polarity sub-pixel in the three sub-pixels in the pixel, the color cast phenomenon is caused.
In order to avoid the occurrence of the color cast phenomenon, the voltage of the common electrode is returned to the reference voltage by adjusting the voltage of the common electrode, so that the color cast phenomenon is avoided.
Specifically, the liquid crystal display panel further includes a timing controller 84, where the timing controller 84 is connected to the common electrode 821 to change the voltages at two sides of the liquid crystal layer 83 through the common electrode 821, so as to control the deflection angle of the liquid crystal layer 83 to control the luminous flux thereof, so that the charge amounts of all the sub-pixels in the current row reach a preset charge amount, and the sub-pixels reach the desired display gray level, thereby improving the color cast phenomenon of the display screen and further improving the display effect of the display screen.
Specifically, the timing controller 84 is configured to obtain a display gray level of each sub-pixel of the current row; calculating display gray scales of all the sub-pixels of the current line based on the display gray scales of all the sub-pixels of the current line to obtain display gray scales and values of all the sub-pixels of the current line and adjustment values corresponding to the display gray scales and values; judging whether the adjustment value is larger than a set value; if the voltage compensation value is larger than the preset threshold value, acquiring a voltage compensation value corresponding to the display gray scale and the display gray scale of the current line according to the adjustment value, and adjusting the output voltage of the common electrode based on the voltage compensation value so as to adjust the display gray scale of all the sub-pixels of the current line through the output voltage of the common electrode.
In this embodiment, the timing controller 84 controls the writing voltage of the pixel electrode 811 to correspond to the display gray level while adjusting the output voltage of the common electrode 821, thereby ensuring that the voltage across the pixel capacitor remains constant, and thus the current pixel displays a normal display gray level.
The beneficial effects of this embodiment are: acquiring the display gray scale of each sub-pixel of the current row through a time sequence controller; calculating display gray scales of all the sub-pixels of the current line based on the display gray scales of all the sub-pixels of the current line to obtain display gray scales and values of all the sub-pixels of the current line and adjustment values corresponding to the display gray scales and values; judging whether the adjustment value is larger than a set value; if so, acquiring a voltage compensation value corresponding to the display gray scale and the value of the current line according to the adjustment value, and adjusting the output voltage of the common electrode based on the voltage compensation value so as to adjust the display gray scales of all the sub-pixels of the current line through the output voltage of the common electrode, so that the display gray scales of the pixels are free from the influence of capacitive coupling, the color cast phenomenon of a display picture is avoided, and the display effect of the display picture is further improved.
The foregoing is only illustrative of the present application and is not to be construed as limiting the scope of the application, and all equivalent structures or equivalent flow modifications which may be made by the teachings of the present application and the accompanying drawings or which may be directly or indirectly employed in other related art are within the scope of the application.
Claims (10)
1. The compensation method of a liquid crystal display panel, wherein the liquid crystal display panel includes a plurality of sub-pixels arranged in an array, each sub-pixel includes a pixel electrode, the pixel electrode and a common electrode form a pixel capacitance, the compensation method of the liquid crystal display panel includes:
acquiring the display gray scale of each sub-pixel of the current row through a time sequence controller; wherein the display gray scale includes positive gray scale data and negative gray scale data;
calculating display gray scales of all the sub-pixels of the current line based on the display gray scales of all the sub-pixels of the current line; the method specifically comprises the following steps: calculating the display gray scale sum of the sub-pixels of the positive gray scale data and the sub-pixels of the negative gray scale data of the current line to obtain the display gray scale sum value;
normalizing the display gray scale and the display value to obtain an adjustment value corresponding to the display gray scale and the display value;
judging whether the adjustment value is larger than a set value or not;
if so, acquiring a voltage compensation value corresponding to the display gray scale and the display gray scale of the current row according to the adjustment value, and adjusting the output voltage of the common electrode based on the voltage compensation value so as to adjust the display gray scale of all the sub-pixels of the current row through the output voltage of the common electrode.
2. The method for compensating a liquid crystal display panel according to claim 1, wherein the step of normalizing the display gray scale and the value to obtain the adjustment value comprises:
obtaining the maximum display gray level and the minimum display gray level of the subpixels of the current row;
calculating to obtain the maximum sum value of the display gray scales of all the sub-pixels of the current row based on the maximum display gray scale and the minimum display gray scale;
and normalizing the display gray scale sum value by using the display gray scale maximum sum value to obtain the adjustment value.
3. The method according to claim 1, wherein the step of obtaining a voltage compensation value corresponding to the display gray scale and value of the current row according to the adjustment value, and adjusting an output voltage of a common electrode based on the voltage compensation value to adjust the display gray scales of all the sub-pixels of the current row by the output voltage of the common electrode comprises:
acquiring a compensation voltmeter of the public electrode;
obtaining the voltage compensation value corresponding to the adjustment value from the compensation voltmeter according to the adjustment value;
and adjusting the voltage of the common electrode based on the voltage compensation value to adjust the display gray scale of all the sub-pixels of the current row through the output voltage of the common electrode.
4. The method of compensating for a liquid crystal display panel according to claim 3, wherein the step of obtaining the voltage compensation value corresponding to the adjustment value from the compensation voltage table according to the adjustment value comprises:
judging whether the adjustment value exists in the compensation voltmeter or not;
if not, rounding the adjustment value, and obtaining the voltage compensation value from the compensation voltage table by using the rounded adjustment value;
if yes, searching from the compensation voltage table according to the adjustment value to obtain the voltage compensation value.
5. The method according to claim 1, wherein after the step of determining whether the adjustment value is greater than a set value, further comprising:
if not, the output voltage of the common electrode is not adjusted.
6. The method of compensating for a liquid crystal display panel according to claim 1, further comprising:
acquiring the display gray scale of each sub-pixel of the next row through a time sequence controller;
calculating display gray scales of all the sub-pixels in the next row based on the display gray scales of all the sub-pixels in the next row, and obtaining adjustment values corresponding to the display gray scales and the adjustment values;
Judging whether the adjustment value is larger than a set value or not;
and if the display gray scale is larger than the display gray scale, acquiring a voltage compensation value corresponding to the display gray scale and the display gray scale of the next row according to the adjustment value, and adjusting the output voltage of the common electrode based on the voltage compensation value so as to adjust the display gray scale of all the sub-pixels of the next row through the output voltage of the common electrode.
7. The method of claim 1, wherein the polarities of the display gray scales of two adjacent sub-pixels are opposite.
8. The method of claim 1, further comprising a push-pull circuit connected to the common electrode to increase an output current of the common electrode.
9. A liquid crystal display panel adjusting circuit, characterized in that the liquid crystal display panel adjusting circuit comprises: the liquid crystal display comprises a time sequence controller, a source electrode driver, a liquid crystal display panel and a gamma controller, wherein the source electrode driver is electrically connected with the time sequence controller, the liquid crystal display panel is electrically connected with the source electrode driver, and the gamma controller is electrically connected with the time sequence controller, the source electrode driver and the liquid crystal display panel;
The time schedule controller is used for obtaining the display gray scale of each sub-pixel of the current row; wherein the display gray scale includes positive gray scale data and negative gray scale data; calculating the display gray scale and the value of all the sub-pixels of the current line based on the display gray scale of each sub-pixel of the current line, wherein the method specifically comprises the following steps: calculating the display gray scale sum of the sub-pixels of the positive gray scale data and the sub-pixels of the negative gray scale data of the current line to obtain the display gray scale sum value; normalizing the display gray scale and the display value to obtain an adjustment value corresponding to the display gray scale and the display value; judging whether the adjustment value is larger than a set value or not; if the display gray scale sum value is larger than the display gray scale sum value, acquiring a voltage compensation value corresponding to the display gray scale sum value of the current line according to the adjustment value;
the gamma controller obtains the voltage compensation values of all the sub-pixels in the current row, and adjusts the output voltage of the common electrode of the liquid crystal display panel based on the voltage compensation values so as to adjust the display gray scale of all the sub-pixels in the current row through the output voltage of the common electrode.
10. The liquid crystal display panel is characterized by comprising 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, each sub-pixel comprises a pixel electrode, each pixel electrode and a common electrode on the color film substrate form a pixel capacitor of the sub-pixel, the deflection of the liquid crystal layer is controlled by the pixel capacitor, and the liquid crystal display panel further comprises a time sequence controller, and is characterized in that the time sequence controller is respectively connected with the pixel electrode and the common electrode so as to control the output voltage of the pixel electrode and the common electrode;
The time schedule controller is used for obtaining the display gray scale of each sub-pixel of the current row; wherein the display gray scale includes positive gray scale data and negative gray scale data; calculating the display gray scale and the value of all the sub-pixels of the current line based on the display gray scale of each sub-pixel of the current line, wherein the method specifically comprises the following steps: calculating the display gray scale sum of the sub-pixels of the positive gray scale data and the sub-pixels of the negative gray scale data of the current line to obtain the display gray scale sum value; normalizing the display gray scale and the display value to obtain an adjustment value corresponding to the display gray scale and the display value; judging whether the adjustment value is larger than a set value or not; if the display gray scale is larger than the display gray scale, acquiring a voltage compensation value corresponding to the display gray scale and the display gray scale of the current row according to the adjustment value, and adjusting the output voltage of the common electrode based on the voltage compensation value so as to adjust the display gray scales of all the sub-pixels of the current row through the output voltage of the common electrode.
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