CN115223512A - Liquid crystal display panel and compensation method thereof - Google Patents
Liquid crystal display panel and compensation method thereof Download PDFInfo
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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
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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
- 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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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, each sub-pixel comprises a pixel electrode, the pixel electrode and a common electrode form a pixel capacitor, 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 the display gray scale and the value of all the sub-pixels of the current row and the adjustment value corresponding to the display gray scale and the value based on the display gray scale of each sub-pixel of the current row; 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 sum 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. By 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 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 variation of the voltage of the data line (Source line), the voltage on the common electrode (CFCOM) is varied due to the capacitive coupling effect, which further affects the deflection angle of the liquid crystal, and thus affects the gray scale display of the picture.
In a special picture, under the condition that the common electrode is coupled seriously, the picture color cast phenomenon can be caused.
Disclosure of Invention
The present application provides a liquid crystal display panel and a compensation method thereof to improve the color cast of a display frame and further improve the display effect of the display frame.
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, each of the sub-pixels includes a pixel electrode, and the pixel electrode and a common electrode form a pixel capacitor, and the compensation method for 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 the display gray scale and the value of all the sub-pixels of the current row and the adjusting value corresponding to the display gray scale and the value based on the display gray scale of each sub-pixel of the current row; judging whether the adjusting value is larger than a set value or not; if so, acquiring a voltage compensation value corresponding to the display gray scale sum 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 scales of all the sub-pixels of the current row through the output voltage of the common electrode.
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, the voltage of the common electrode connected with the pixel electrode of each sub-pixel is adjusted according to the adjustment value, the display gray scale of the sub-pixel of the current row is adjusted through the output voltage of the common electrode, and the display gray scale of each sub-pixel reaches the expected display gray scale.
Wherein the display gray scale comprises positive gray scale data and negative gray scale data; the step of calculating the display gray scale and the value of all the sub-pixels of the current row and the adjustment value corresponding to the display gray scale and the value based on the display gray scale of each sub-pixel of the current row comprises the following steps: calculating the sum of the display gray scales 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 sum of the display gray scales; and carrying out normalization processing on the display gray scale sum 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 scale of the current row is calculated through the display gray scale to obtain the overall display level of the current row, and the voltage adjustment values of all the sub-pixels of the current row are obtained according to the overall display level.
Wherein, the step of normalizing the display gray scale sum value to obtain the adjustment value comprises: acquiring the maximum display gray scale and the minimum display gray scale of the sub-pixels of the current row; calculating to obtain the maximum sum 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 carrying out normalization processing on 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 obtained through calculation, and the display gray scale sum value is normalized by 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 sum 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 to adjust the display gray scales of all the sub-pixels of the current row by the output voltage of the common electrode includes: acquiring a compensation voltmeter of the common electrode; obtaining the voltage compensation value corresponding to the adjustment value from the compensation voltmeter according to the adjustment value; adjusting the 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, the adjusted output voltage of the common electrode is obtained by the compensation voltmeter.
Wherein the step of obtaining the voltage compensation value corresponding to the adjustment value from the compensation voltmeter according to the adjustment value comprises: judging whether the compensation voltmeter has the adjustment value; if not, rounding the adjustment value, and obtaining the voltage compensation value from the compensation voltmeter by using the rounded adjustment value; and if so, searching 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 or not.
After the step of determining whether the adjustment value is greater than the set value, the method further includes: and if not, not adjusting the output voltage of the common electrode.
Therefore, when the gray scale deviation is not large, no adjustment is needed.
The compensation method of the liquid crystal display panel further comprises the following steps: obtaining the display gray scale of each sub-pixel of the next row through a time sequence controller; calculating the display gray scale and the value of all the sub-pixels of the next row and the adjusting value corresponding to the display gray scale and the value based on the display gray scale of each sub-pixel of the next row; judging whether the adjustment value is larger than a set value or not; if the sum of the display gray scales is larger than the sum of the display gray scales of the next row, acquiring a voltage compensation value corresponding to the sum of the display gray scales 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 scales of all the sub-pixels of the next row through the output voltage of the common electrode.
Therefore, after all the sub-pixels of the current row are charged, the display gray scales and the values of all the sub-pixels of the next row are obtained before the sub-pixels of the next row are charged, the voltage compensation values of the common electrodes corresponding to all the sub-pixels of the next row are obtained according to the display gray scales and the values of the next row, the output voltage of the common electrodes is adjusted when all the sub-pixels of the next row are charged, the charging voltage of all the sub-pixels of the next row is guaranteed to reach the preset voltage, and the display gray scales of all the sub-pixels of the next row are adjusted.
And the polarities of the display gray scales of two adjacent sub-pixels are opposite.
Therefore, the polarity inversion method of the display gray scale of the sub-pixel is limited.
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 common electrode is ensured by externally connecting a push-pull circuit.
The present application further provides a liquid crystal display panel adjusting circuit, which is characterized in that the liquid crystal display panel adjusting 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 time sequence controller, 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 of the current row; calculating the display gray scale and the value of all the sub-pixels of the current row and the adjusting value corresponding to the display gray scale and the value based on the display gray scale of each sub-pixel of the current row; judging whether the adjustment value is larger than a set value or not; if the gray scale sum value is larger than the preset 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 acquires the voltage compensation values of all the sub-pixels of 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 of the current row through the output voltage of the common electrode.
Therefore, the adjusting value of the common voltage is obtained through the time sequence controller, and the display gray scale of each sub-pixel is adjusted 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 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, and the pixel capacitor controls the deflection of the liquid crystal, wherein the time schedule controller is respectively connected with the pixel electrode and the common electrode so as to control the output voltages of the pixel electrode and the common electrode; the time sequence controller is used for acquiring the display gray scale of each sub-pixel of the current row; calculating the display gray scale and the value of all the sub-pixels of the current row and the adjustment value corresponding to the display gray scale and the value based on the display gray scale of each sub-pixel of the current row; judging whether the adjusting value is larger than a set value or not; if the sum value is larger than the preset value, acquiring a voltage compensation value corresponding to the display gray scale sum 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 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 adjusted by the time schedule controller, so that the pixel electrodes of the sub-pixels are influenced by the pixel capacitance of the sub-pixels, the normal charging quantity of the pixel electrodes of all the sub-pixels of the current row is ensured, all the sub-pixels of the current row reach the normal display gray scale, and the color cast phenomenon is avoided.
The beneficial effect of this application is: acquiring the display gray scale of each sub-pixel of the current row through a time sequence controller; calculating the display gray scale and the value of all the sub-pixels of the current row and the adjustment value corresponding to the display gray scale and the value based on the display gray scale of each sub-pixel of the current row; judging whether the adjusting value is larger than a set value or not; if so, acquiring a voltage compensation value corresponding to the display gray scale sum 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, 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 in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flowchart illustrating a compensation method for a liquid crystal display panel according to a first embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram 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 an embodiment of step S13 of the present application;
FIG. 5 is a schematic circuit diagram of an embodiment of a control circuit of an LCD panel according to the present invention;
FIG. 6 is a schematic circuit diagram of an OP compensation in accordance with the prior art embodiment;
FIG. 7 is a simplified circuit schematic of the 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 an array substrate; 82, a color film substrate; 83 a liquid crystal layer; 84 a timing controller; 811 pixel electrodes; 821 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 "plural" includes at least two in general, 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 associated 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 up, down, left, right, front, back, 8230; \8230;) are referred to in the embodiments of the present application, the directional indications are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached 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 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 of the current row through the 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 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 voltage is a voltage greater than the common electrode (CFCOM) voltage, and the negative 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. The display brightness of the pixel or the sub-pixel is adjusted by the voltage difference between two ends of the pixel capacitor in the sub-pixel, namely, the deflection of the liquid crystal of the sub-pixel is controlled by the voltage difference between the pixel electrode and the common electrode so as to control the light flux of the liquid crystal, thereby realizing the display gray scale.
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 by positive polarity voltages, the sub-pixels of the second column are driven by negative polarity voltages, and so on. In another embodiment, the liquid crystal display panel may also be dot-inverted polarity driving, and in yet another embodiment, may also be frame-inverted polarity driving. 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 and the value of all the sub-pixels of the current row and the adjusting value corresponding to the display gray scale and the value based on the display gray scale of each sub-pixel of the current row.
The method specifically comprises the following steps: and calculating the display gray scales and values of all the sub-pixels of the current row according to the display gray scales of all the sub-pixels, and obtaining an adjusting value corresponding to the display gray scales and values.
In the present embodiment, the adjustment value is a voltage adjustment value. In other embodiments, the adjustment value may be a gray level adjustment value.
In a specific calculation manner, the step further includes steps S21 to S22. Specifically, referring to fig. 3, fig. 3 is a flowchart illustrating an embodiment of step S12 in the present application. As shown in fig. 3, step S12 includes:
step S21: and calculating the sum of the display gray scales of the sub-pixel of the positive gray scale data and the sub-pixel of the negative gray scale data of the current line to obtain the sum of the display gray scales.
The display gray scale sum value is the sum of the display gray scales of all the sub-pixels of the current row.
Taking the resolution of the lcd panel as 1920 × 1080 as an example, each row of the lcd panel includes 1920 × 3 sub-pixels, and assuming that there are 960 pixels with a display gray scale of +127, 960 pixels with a display gray scale of-127, 960 pixels with a display gray scale of +255 and 960 pixels with a display gray scale of-0 in the current row, the display gray scales and values of all the sub-pixels in the current row are: (+ 127) × (960 × 3/2) + (-127) × (960 × 3/2) + (+ 255) × (960 × 3/2) + (-0) × (960 × 3/2) = +367200.
In other embodiments, the display gray scale sum value may also be an absolute value of a sum value of display gray scales of all sub-pixels of the current row, which is not limited herein.
Step S22: and carrying out normalization processing on the display gray scale sum value to obtain an adjustment value.
The method comprises the following steps: acquiring the maximum display gray scale and the minimum display gray scale of the sub-pixels 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 an adjustment value.
Wherein the maximum display gray scale is 255 and the minimum display gray scale is 0. And calculating the maximum sum value of the display gray scales according to the maximum display gray scale and the minimum display gray scale, and normalizing the maximum sum value of the display gray scales to be 1.
In this embodiment, the display gray scale sum value is normalized by taking the value of the total number of sub-pixels/2 × 255 in one row as "1".
Taking the resolution of the liquid crystal display panel as 1920 × 1080 for example, the total number of sub-pixels/2 × 255 in one row is equal to 1920 × 3/2 × 255=734400. If the sum of the display gray scales of all the sub-pixels of the current row is +367200, the adjustment value of the current row is +367200/734400= +0.5; if the sum of the display grayscales of all the sub-pixels of the current row is-255000, the adjustment value of the current row is-255000/734400 = -0.347.
In this embodiment, the adjustment value is a ratio of the sum of the display gray levels to the maximum sum of the display gray levels.
Step S13: and judging whether the adjustment value is larger than a 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 more greatly, and adjustment is needed; if the adjustment value is not larger than the set value, the display gray scale of the liquid crystal display panel deviates from the original display gray scale to be smaller, and adjustment is not needed.
It should be noted that, the color cast phenomenon or 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 changes suddenly at this time, when the voltage difference value of the positive and negative polarities in a row is the same, the voltage of the common electrode can be cancelled out, and the voltage of the common electrode can be returned to the original voltage, but when the voltage difference of the positive and negative polarities in a row is too large, the voltage of the common electrode cannot be returned to the original voltage 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 more, the VCOM increases; when the sum of 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 requirement, so that the pixel cannot achieve the normal display gray scale. One end of the pixel capacitor is the voltage of the pixel electrode, and the other end of the pixel capacitor is the voltage of the common electrode. Due to the existence of the capacitive coupling phenomenon, the whole display picture of the liquid crystal display panel deviates from the original display picture, and is embodied in the color cast phenomenon. When the display gray scales of the R pixel and the B pixel in the RGB sub-pixels are the same and are 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 greater than the sum of the display gray scales of the G pixel, so that the liquid crystal capacitance of each green sub-pixel is increased, and the whole picture is greenish, which is a color cast phenomenon. The color cast phenomenon also includes reddening or bluing.
In this embodiment, the absolute value of the setting value is not less than 0.2, and in other embodiments, the setting value may be set according to the lcd panel or the compensation voltage meter.
Step S14: if so, acquiring a voltage compensation value corresponding to the display gray scale sum 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.
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, the output voltage of the common electrode can return to a normal reference voltage after the pixel capacitor is charged under the capacitive coupling phenomenon, the voltage of the common electrode is influenced by the capacitive coupling, and the influence of the 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 timing controller is unchanged, and the voltage difference between the 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.
This step specifically includes steps S31-33, specifically please refer to fig. 4, and fig. 4 is a schematic structural diagram of an embodiment of step S14 in this 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, and reflects the relation between the adjustment value and the compensation voltage of the common electrode.
Specifically, the present application also lists a compensation voltmeter, please refer to the following table:
in this embodiment, the X value is a ratio of the sum of the display gray scales to the maximum sum of the display gray scales. The voltage compensation value of the common electrode has positive and negative values, 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 may not be linearly related to the voltage compensation value, 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 value of X is inversely related to the voltage compensation value. Wherein, the larger the X value is, the smaller the voltage compensation value is, such as 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 larger 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 (which may be set).
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 or not; if so, directly acquiring a voltage compensation value corresponding to the adjustment value from the compensation voltmeter; if not, the adjustment value in the compensation voltmeter needs to be obtained through rounding processing, and the corresponding voltage compensation value is obtained according to the adjustment value.
In this embodiment, one decimal is left after rounding to obtain the adjusted adjustment value.
Step S33: and adjusting the 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.
Specifically, the charging amount of the pixel electrodes of all the sub-pixels in the current row is reduced by the output voltage of the common electrode and is influenced by the capacitive coupling, so that the display gray scales of all the sub-pixels are adjusted to reach the normal display gray scale, wherein the normal display gray scale is 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 also comprises the following steps: obtaining the display gray scale of each sub-pixel of the next row through a time sequence controller; calculating the display gray scale and the value of all the sub-pixels of the next row and the adjustment value corresponding to the display gray scale and the value based on the display gray scale of each sub-pixel of the next row; judging whether the adjusting value is larger than a set value or not; if the sum of the display gray scales is larger than the preset value, acquiring a voltage compensation value corresponding to the sum of the display gray scales 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 scales of all the sub-pixels of the next row through the output voltage of the common electrode.
Wherein the next line refers to any line other than the current line. In this embodiment, the scanning line scans along each row, and the next row refers to the next row of the current row; if the scanning line is scanned every two rows, the next row is the next row of the current row, and the scanning line is not limited herein.
The beneficial effect of this embodiment is: obtaining the display gray scale of each sub-pixel of the current row through a time sequence controller; calculating the display gray scale and the value of all the sub-pixels of the current row and the adjustment value corresponding to the display gray scale and the value based on the display gray scale of each sub-pixel of the current row; judging whether the adjusting value is larger than a set value or not; if so, acquiring a voltage compensation value corresponding to the display gray scale sum 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 sub-pixels of the current line from being influenced by capacitive coupling 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.
Please refer to fig. 5, wherein 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. 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 (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 from the timing controller 101 and the gamma signal from the gamma controller 102 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 display gray scale of each sub-pixel in the selected region is obtained by the timing controller 101, the display gray scale characterization value of each sub-pixel in the selected region is calculated according to the display gray scale of each sub-pixel, and it is determined 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, if so, 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, also called 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 does not change, and the voltage input to the common electrode of the sub-pixel by the gamma controller 102 changes. The voltage of the common electrode of each sub-pixel is changed, the voltage of the pixel electrode is not changed, 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 improved.
The present application further provides a structure using OP (operational amplifier) compensation, please refer to fig. 6, where fig. 6 is a circuit structure diagram of a prior embodiment of OP compensation. As shown in fig. 6, a Vcom signal is collected from the liquid crystal display panel as a first input terminal 61, a 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 connected to ground.
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 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 to ensure that the acquired input voltage of the second input terminal 62 is stable.
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. 6, the existing method using OP compensation includes: collecting Vcom signals of a current line from the liquid crystal display panel and collecting output Vcom signals from a P-gamma IC terminal, 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 present application directly inputs the adjusted Vcom signal into the liquid crystal display panel, and omits OP, peripheral resistor R, capacitor C and other circuits, thereby simplifying the compensation circuit and eliminating the compensation delay. Specifically, referring further to fig. 7, fig. 7 is a simplified circuit diagram of an 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. Compared to fig. 6, the op and its peripheral circuits are omitted, eliminating the latency of the compensation. In this embodiment, the timing controller 101 determines that the voltage corresponding to the display gray scale of the sub-pixels in the current row needs to be compensated, transmits the compensation signal to the gamma controller 102, and directly compensates the voltage of the common electrode of all the pixels in the current row through the gamma controller 102, so as to adjust the display gray scale of all the sub-pixels in the current row through 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.
Fig. 8 is a schematic structural diagram of an embodiment of the liquid crystal display panel of the present application. As shown in fig. 8, the liquid crystal display panel includes: the liquid crystal display panel comprises an array substrate 81, a color filter substrate 82 and a liquid crystal layer 83 located between the array substrate 81 and the color filter substrate 82. The array substrate 81 is provided with a pixel electrode 811, the color filter substrate 82 is provided with a common electrode 821, the pixel electrode 811 and the common electrode 821 form a pixel capacitor, and an electric field formed between the pixel electrode 811 and the common electrode 821 changes to deflect the liquid crystal layer 83 to transmit light, thereby displaying a picture.
The array substrate 81 includes a plurality of sub-pixels, each sub-pixel includes a pixel electrode 811, that is, 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 entire panel voltage on the common electrode 821 through 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 sub-pixel with the same polarity in the three sub-pixels in the pixel is greater than that of the other sub-pixel with the opposite polarity, the color cast phenomenon can be caused to occur.
In order to avoid the color cast phenomenon, the voltage of the common electrode is adjusted to return to the reference voltage, so that the color cast phenomenon is avoided.
Specifically, the liquid crystal display panel further includes a timing controller 84, the timing controller 84 is connected to the common electrode 821 to change the voltage on the two sides of the liquid crystal layer 83 through the common electrode 821, and further control the deflection angle of the liquid crystal layer 83 to control the light flux thereof, so that the charge amount of all the sub-pixels in the current row reaches the preset charge amount, and the sub-pixels reach the desired display gray scale, thereby improving the color cast of the display frame and further improving the display effect of the display frame.
Specifically, the timing controller 84 is configured to obtain a display gray scale of each sub-pixel of the current row; calculating the display gray scale and the value of all the sub-pixels of the current row and the adjustment value corresponding to the display gray scale and the value based on the display gray scale of each sub-pixel of the current row; judging whether the adjusting value is larger than a set value or not; if the sum of the display gray scales of the current row is larger than the sum of the display gray scales of the current row, acquiring a voltage compensation value corresponding to the sum of the display gray scales 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.
In this embodiment, the timing controller 84 controls the writing voltage of the pixel electrode 811 to correspond to the display gray scale while adjusting the output voltage of the common electrode 821, so as to ensure that the voltage across the pixel capacitor is kept constant, thereby enabling the current pixel to display the normal display gray scale.
The beneficial effects of this embodiment: acquiring the display gray scale of each sub-pixel of the current row through a time sequence controller; calculating the display gray scale and the value of all the sub-pixels of the current row and the adjustment value corresponding to the display gray scale and the value based on the display gray scale of each sub-pixel of the current row; judging whether the adjusting value is larger than a set value or not; if so, acquiring a voltage compensation value corresponding to the display gray scale sum 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 to adjust the display gray scales of all the sub-pixels of the current row through the output voltage of the common electrode, so that the display gray scales of the pixels are not influenced by capacitive coupling, the color cast phenomenon of the display picture is avoided, 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 (11)
1. A compensation method of a liquid crystal display panel is disclosed, wherein the liquid crystal display panel comprises a plurality of sub-pixels arranged in an array, each sub-pixel comprises a pixel electrode, and the pixel electrode and a common electrode form a pixel capacitor, 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 the display gray scale and the value of all the sub-pixels of the current row and the adjustment value corresponding to the display gray scale and the value based on the display gray scale of each sub-pixel of the current row;
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 sum 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.
2. The compensation method for liquid crystal display panel according to claim 1, wherein the display gray scale includes positive gray scale data and negative gray scale data;
the step of calculating the display gray scale and the value of all the sub-pixels of the current row and the adjustment value corresponding to the display gray scale and the value based on the display gray scale of each sub-pixel of the current row comprises the following steps:
calculating the sum of the display gray scales 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 sum of the display gray scales;
and carrying out normalization processing on the display gray scale sum value to obtain the adjustment value.
3. The compensation method for liquid crystal display panel according to claim 2, wherein the step of normalizing the display gray scale sum value to obtain the adjustment value comprises:
acquiring the maximum display gray scale and the minimum display gray scale of the sub-pixels of the current row;
calculating to obtain the maximum sum 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.
4. The method as claimed in claim 1, wherein the step of obtaining a voltage compensation value corresponding to the sum of the display gray scales of the current row according to the adjustment value and adjusting the output voltage of the 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 common electrode;
obtaining the voltage compensation value corresponding to the adjustment value from the compensation voltmeter according to the adjustment value;
adjusting the 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.
5. The method according to claim 4, 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 compensation voltmeter has the adjustment value;
if not, rounding the adjustment value, and obtaining the voltage compensation value from the compensation voltmeter by using the rounded adjustment value;
and if so, searching the compensation voltage table according to the adjustment value to obtain the voltage compensation value.
6. The compensation method for liquid crystal display panel according to claim 1, further comprising, after the step of determining whether the adjustment value is greater than a set value:
and if not, not adjusting the output voltage of the common electrode.
7. The compensation method for liquid crystal display panel according to claim 1, further comprising:
obtaining the display gray scale of each sub-pixel of the next row through a time sequence controller;
calculating the display gray scale and the value of all the sub-pixels of the next row and the adjusting value corresponding to the display gray scale and the value based on the display gray scale of each sub-pixel of the next row;
judging whether the adjusting value is larger than a set value or not;
if the sum of the display gray scales is larger than the sum of the display gray scales of the next row, acquiring a voltage compensation value corresponding to the sum of the display gray scales 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 scales of all the sub-pixels of the next row through the output voltage of the common electrode.
8. The compensation method for liquid crystal display panel according to claim 1, wherein the display gray scales of two adjacent sub-pixels have opposite polarities.
9. The compensation method for liquid crystal display panel according to claim 1, wherein the liquid crystal display panel further comprises a push-pull circuit, and the push-pull circuit is connected to the common electrode to increase the output current of the common electrode.
10. The liquid crystal display panel regulating circuit, characterized in that, 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 time sequence controller, 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 of the current row; calculating the display gray scale and the value of all the sub-pixels of the current row and the adjustment value corresponding to the display gray scale and the value based on the display gray scale of each sub-pixel of the current row; judging whether the adjustment value is larger than a set value or not; if the gray scale sum value is larger than the preset 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 acquires the voltage compensation values of all the sub-pixels of 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 of the current row through the output voltage of the common electrode.
11. 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 manner, 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, and the pixel capacitor controls the deflection of the liquid crystal layer;
the time sequence controller is used for acquiring the display gray scale of each sub-pixel of the current row; calculating the display gray scale and the value of all the sub-pixels of the current row and the adjustment value corresponding to the display gray scale and the value based on the display gray scale of each sub-pixel of the current row; judging whether the adjustment value is larger than a set value or not; if the sum of the display gray scales of the current row is larger than the sum of the display gray scales of the current row, acquiring a voltage compensation value corresponding to the sum of the display gray scales 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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