CN105469767A - Common voltage compensation circuit, compensation method, display panel and display device - Google Patents

Common voltage compensation circuit, compensation method, display panel and display device Download PDF

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Publication number
CN105469767A
CN105469767A CN201610007056.9A CN201610007056A CN105469767A CN 105469767 A CN105469767 A CN 105469767A CN 201610007056 A CN201610007056 A CN 201610007056A CN 105469767 A CN105469767 A CN 105469767A
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compensation
value
common voltage
control signal
module
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CN105469767B (en
Inventor
苏国火
孙志华
马伟超
刘宝玉
姚树林
张洪林
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BOE Technology Group Co Ltd
Beijing BOE Display Technology Co Ltd
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BOE Technology Group Co Ltd
Beijing BOE Display Technology Co Ltd
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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
    • G09G3/3622—Control of matrices with row and column drivers using a passive matrix
    • G09G3/3625—Control of matrices with row and column drivers using a passive matrix using active addressing
    • 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
    • G09G3/3674—Details of drivers for scan electrodes

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The invention discloses a common voltage compensation circuit, a compensation method, a display panel and a display device. The common voltage compensation circuit converts a common voltage analog signal of a sampling point to a digital signal sampling value via a first conversion module; according to the sampling value, a standard value generated by a decoding module, the preset gain times and the compensation times, through calculation, a processing module determines a signal for common voltage compensation, the compensation signal is thus converted to an analog quantity through a second conversion module, the analog quantity is outputted to a compensation point, real-time common voltage compensation on the display panel is thus realized, and as for a compensation point in a different area, a different compensation value is determined and compensation is carried out; and the common voltage signal adopts a digital quantity through a data bus during a transmission process to be transmitted to the decoding module, accuracy of the common voltage signal value in the case of long-distance transmission can be ensured, the common voltage signal analog quantity is converted into the digital quantity, calculation and comparison are easy to realize, and the design implementation and the operation of the common voltage compensation circuit are facilitated.

Description

Common voltage compensation circuit, compensation method, display panel and display device
Technical Field
The invention relates to the technical field of display, in particular to a common voltage compensation circuit, a compensation method, a display panel and a display device.
Background
In the prior art, the voltage Vcom on the common electrode of the liquid crystal panel has a transient change with the switching of the picture, especially under some specific display pictures, the deviation of Vcom from the initial standard voltage value is very serious, in order to solve the problem of voltage deviation. The technical means adopted in the prior art is that some sampling points of the liquid crystal panel are connected back to the time sequence controller through wires, the operational amplifier is used in the time sequence controller to output and input voltage signals with reversed phases, and then the voltage signals are connected back to the position to be compensated through the wires, so that the deviation compensation of the public voltage is realized. The technical scheme of the common voltage compensation can realize direct voltage compensation, but because the transmission lines are all provided with analog signal quantities, the analog signal quantities are lost along with the transmission of the transmission lines, and the anti-interference performance of the analog signal quantities is poor, so that the analog signals for compensating the common voltage are lost through long-distance transmission, particularly along with the development of large-size display panels, the compensation scheme is adopted for large-size liquid crystal screens (more than 65 inches), and because the compensation analog signal quantities are lost along with the transmission lines, the compensation effect is poor, and the display effect of display pictures is finally influenced.
Therefore, how to implement the compensation of the common voltage, improve the loss of the common voltage compensation signal in the transmission process, and improve the display effect of the display panel is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The embodiment of the invention provides a common voltage compensation circuit, a compensation method, a display panel and a display device, which are used for improving the loss of a common voltage compensation signal in a transmission process and improving the display effect of the display panel.
The embodiment of the invention provides a public voltage compensation circuit, which comprises: the device comprises a first conversion module, a processing module, a second conversion module and a decoding module; wherein,
the first conversion module is used for carrying out analog-to-digital conversion on the common voltage analog signal of the sampling point, generating a corresponding sampling value and outputting the sampling value to the processing module;
the decoding module is used for generating a standard value corresponding to a common voltage data signal from the common voltage data signal input by the data bus, and outputting a preset compensation multiple, a preset gain multiple and the generated standard value to the processing module;
the processing module is used for determining a compensation value for compensating a common voltage signal according to the sampling value input by the first conversion module and the standard value, the compensation multiple and the gain multiple input by the decoding module and outputting the compensation value to the second conversion module;
and the second conversion module is used for performing digital-to-analog conversion on the compensation value output by the processing module and outputting the compensation value to a compensation point.
In a possible implementation manner, in the above-mentioned common voltage compensation circuit provided in an embodiment of the present invention, the processing module is specifically configured to: according to the sampling value, the standard value, the gain multiple and the compensation multiple, determining a compensation value for compensating a common voltage signal according to a preset calculation formula and outputting the compensation value to the second conversion module; wherein, the preset calculation formula is as follows:
Z＝I*Y-T*(X-I*Y)；
wherein Z is a compensation value; x is a sampling value; y is a standard value; t is a compensation multiple, and the initial value of T is a preset value T0; i is the gain multiple of the standard value Y, and the initial value of I is 1.
In a possible implementation manner, the common voltage compensation circuit provided in an embodiment of the present invention further includes: a compensation adjustment module;
the compensation adjusting module is used for comparing the absolute value of the difference between the sampling value and the standard value with a first preset value, judging whether the absolute value of the difference is smaller than the first preset value or not, and if so, outputting the compensation value determined by the processing module to the second conversion module; if not, judging whether the difference value is larger than the first preset value, if so, outputting a first control signal to the decoding module, otherwise, outputting a second control signal to the decoding module;
the decoding module is used for increasing a gain multiple and a compensation multiple when receiving the first control signal; upon receiving the second control signal, decreasing a gain factor and increasing a compensation factor.
In a possible implementation manner, the common voltage compensation circuit provided in an embodiment of the present invention further includes: a compensation adjustment module;
the compensation adjustment module is used for comparing the absolute value of the difference value between the sampling value and the standard value with a second preset value, a third preset value and a fourth preset value;
judging whether the absolute value of the difference value is smaller than the second preset value or not, if so, executing a first step; otherwise, executing the second step;
a first step of outputting the compensation value determined by the processing module to the second conversion module;
a second step of judging whether the absolute value of the difference value is larger than a third preset value or not, if so, executing the third step, otherwise, executing the fourth step;
a third step of judging whether the difference value is larger than a third preset numerical value, if so, executing a fifth step, otherwise, executing a sixth step;
a fourth step of judging whether the absolute value of the difference value is greater than the fourth preset value and smaller than the third preset value, if so, executing the seventh step, otherwise, executing the eighth step;
a fifth step of outputting a third control signal to the decoding module;
a sixth step of outputting a fourth control signal to the decoding module;
a seventh step of judging whether the difference value is larger than the fourth preset value and smaller than the third preset value, if so, executing a ninth step, otherwise, executing a tenth step;
an eighth step of judging whether the absolute value of the difference is larger than the second preset value and smaller than the fourth preset value, if so, executing an eleventh step, otherwise, executing a twelfth step;
a ninth step of outputting a fifth control signal to the decoding module;
a tenth step of outputting a sixth control signal to the decoding module;
eleventh, outputting a seventh control signal to the decoding module;
a twelfth step of outputting an eighth control signal to the decoding module;
the decoding module is used for adjusting the gain multiple to a first gain multiple and increasing a compensation multiple when the third control signal is received; when the fourth control signal is received, adjusting the gain multiple to a second gain multiple, and increasing a compensation multiple; when the fifth control signal is received, adjusting the gain multiple to a third gain multiple, and increasing a compensation multiple; when the sixth control signal is received, adjusting the gain multiple to a fourth gain multiple, and increasing a compensation multiple; when the seventh control signal is received, adjusting the gain multiple to a fifth gain multiple, and increasing a compensation multiple; and when the eighth control signal is received, adjusting the gain multiple to a sixth gain multiple and increasing a compensation multiple.
In a possible implementation manner, in the above-mentioned common voltage compensation circuit provided in an embodiment of the present invention, the decoding module specifically includes: a decoding unit and a gain adjustment unit;
the decoding unit is used for generating a common voltage data signal input by a data bus into a standard value corresponding to the common voltage data signal;
the gain adjusting unit is used for correspondingly adjusting the gain multiple and increasing the compensation multiple when receiving the corresponding control signal input by the compensation adjusting module.
In a possible implementation manner, in the above-mentioned common voltage compensation circuit provided by the embodiment of the present invention, the gain adjustment unit is further configured to initialize the compensation multiple and the gain multiple after the second conversion module outputs the compensation value to a compensation point.
In a possible implementation manner, the common voltage compensation circuit provided in an embodiment of the present invention further includes: the input buffer module and the output buffer module; wherein,
the input buffer module is used for receiving and buffering a common voltage data signal input by the data bus and outputting the common voltage data signal to the decoding module;
and the output buffer module is used for buffering the signal output by the second conversion module and outputting the signal to a compensation point.
The embodiment of the present invention provides a compensation method for the common voltage compensation circuit, which includes:
carrying out analog-to-digital conversion on the common voltage analog signal of the sampling point to generate a corresponding sampling value;
generating a standard value corresponding to a common voltage data signal from a common voltage data signal input by a data bus;
determining a compensation value for compensating the common voltage signal according to the sampling value, the standard value, a preset compensation multiple and a gain multiple;
and D/A converting the compensation value and outputting the converted compensation value to a compensation point.
In a possible implementation manner, in the compensation method of the common voltage compensation circuit provided by an embodiment of the present invention, the determining a compensation value for compensating the common voltage signal according to the sampling value, the standard value, a preset compensation multiple and a preset gain multiple specifically includes:
determining a compensation value for compensating the common voltage signal according to a preset calculation formula according to the sampling value, the standard value, the gain multiple and the compensation multiple; wherein, the preset calculation formula is as follows:
Z＝I*Y-T*(X-I*Y)；
wherein Z is a compensation value; x is a sampling value; y is a standard value; t is a compensation multiple, and the initial value of T is a preset value T0; i is the gain multiple of the standard value Y, and the initial value of I is 1.
In a possible implementation manner, the compensation method of the common voltage compensation circuit provided by the embodiment of the present invention further includes:
comparing the absolute value of the difference between the sampling value and the standard value with a first preset value, judging whether the absolute value of the difference is smaller than the first preset value, if so, outputting the compensation value determined by the processing module to the second conversion module; if not, judging whether the difference value is larger than the first preset value, if so, outputting a first control signal to the decoding module, otherwise, outputting a second control signal to the decoding module;
increasing the gain factor and increasing a compensation factor when the first control signal is received; upon receiving the second control signal, decreasing the gain factor and increasing a compensation factor.
In a possible implementation manner, the compensation method of the common voltage compensation circuit provided by the embodiment of the present invention further includes:
comparing the absolute value of the difference between the sampling value and the standard value with a second preset value, a third preset value and a fourth preset value;
judging whether the absolute value of the difference value is smaller than the second preset value or not, if so, executing a first step; otherwise, executing the second step;
a first step of outputting the compensation value determined by the processing module to the second conversion module;
a second step of judging whether the absolute value of the difference value is larger than a third preset value or not, if so, executing the third step, otherwise, executing the fourth step;
a third step of judging whether the difference value is larger than a third preset numerical value, if so, executing a fifth step, otherwise, executing a sixth step;
a fourth step of judging whether the absolute value of the difference value is greater than the fourth preset value and smaller than the third preset value, if so, executing the seventh step, otherwise, executing the eighth step;
a fifth step of outputting a third control signal to the decoding module;
a sixth step of outputting a fourth control signal to the decoding module;
a seventh step of judging whether the difference value is larger than the fourth preset value and smaller than the third preset value, if so, executing a ninth step, otherwise, executing a tenth step;
an eighth step of judging whether the absolute value of the difference is larger than the second preset value and smaller than the fourth preset value, if so, executing an eleventh step, otherwise, executing a twelfth step;
a ninth step of outputting a fifth control signal to the decoding module;
a tenth step of outputting a sixth control signal to the decoding module;
eleventh, outputting a seventh control signal to the decoding module;
a twelfth step of outputting an eighth control signal to the decoding module;
when the third control signal is received, adjusting the gain multiple to a first gain multiple and increasing a compensation multiple; when the fourth control signal is received, adjusting the gain multiple to a second gain multiple, and increasing a compensation multiple; when the fifth control signal is received, adjusting the gain multiple to a third gain multiple, and increasing a compensation multiple; when the sixth control signal is received, adjusting the gain multiple to a fourth gain multiple, and increasing a compensation multiple; when the seventh control signal is received, adjusting the gain multiple to a fifth gain multiple, and increasing a compensation multiple; and when the eighth control signal is received, adjusting the gain multiple to a sixth gain multiple and increasing a compensation multiple.
In a possible implementation manner, the compensation method of the common voltage compensation circuit provided by the embodiment of the present invention further includes: initializing the compensation multiple and the gain multiple after the compensation value is output to a compensation point.
An embodiment of the present invention provides a display panel, including: the timing controller and the common voltage compensation circuit provided by the embodiment of the invention; wherein,
the time sequence controller is used for inputting a common voltage signal to a common electrode of the display panel, and outputting a standard common voltage signal to the common voltage compensation circuit through a data bus after performing analog-to-digital conversion on the standard common voltage signal;
and the common voltage compensation circuit is used for determining and compensating a common voltage compensation signal according to the signal input by the time sequence controller and the sampled common voltage signal.
In a possible implementation manner, in the display panel provided in an embodiment of the present invention, the timing controller specifically includes: a common voltage generating unit and an analog-to-digital converting unit; wherein,
the common voltage generating unit inputs a common voltage signal to a common electrode of the display panel;
the analog-to-digital conversion unit is used for converting the common voltage analog signal into a common voltage data signal and outputting the common voltage data signal to the common voltage compensation circuit through the data bus.
In a possible implementation manner, the display panel provided in an embodiment of the present invention further includes: a plurality of gate driving chips; the number of the common voltage compensation circuits is multiple;
the plurality of common voltage compensation circuits are respectively integrated on the plurality of gate driving chips.
In a possible implementation manner, in the display panel provided by the embodiment of the present invention, the second conversion module in the common voltage compensation circuit is disposed in a peripheral area on the display panel.
The embodiment of the invention provides a display device, which comprises the display panel.
The embodiment of the invention has the beneficial effects that:
the embodiment of the invention provides a common voltage compensation circuit, a compensation method, a display panel and a display device, wherein a first conversion module in the common voltage compensation circuit performs analog-to-digital conversion on a common voltage analog signal of a sampling point to generate a corresponding sampling value and outputs the sampling value to a processing module; the decoding module generates a standard value corresponding to the public voltage data signal from the public voltage data signal input by the data bus, and outputs a preset compensation multiple, a preset gain multiple and the generated standard value to the processing module; the processing module determines a compensation value for compensating the common voltage signal according to the sampling value, the standard value, the compensation multiple and the gain multiple and outputs the compensation value to the second conversion module; and the second conversion module performs digital-to-analog conversion on the compensation value output by the processing module and outputs the compensation value to a compensation point.
Specifically, a common voltage analog signal of a sampling point is converted into a digital signal sampling value through a first conversion module, a processing module calculates according to the sampling value and a standard value, a preset gain multiple and a preset compensation multiple generated by a decoding module to determine a signal for common voltage compensation, and then the compensation signal is converted into an analog quantity through a second conversion module and output to a compensation point, so that real-time compensation of common voltage on a display panel is realized, and different compensation values can be determined and compensated aiming at compensation points in different areas; meanwhile, the public voltage signal is transmitted to the decoding module through a data bus in the transmission process by adopting a digital quantity, so that the accuracy of the public voltage signal value in long-distance transmission can be ensured, the occurrence of large loss is avoided, the analog quantity of the public voltage signal is converted into the digital quantity, the calculation and the comparison are easy to realize, and the design implementation and the operation processing of the public voltage compensation circuit are facilitated.
Drawings
Fig. 1-3 are schematic structural diagrams of a common voltage compensation circuit according to an embodiment of the present invention;
FIG. 4 is a flowchart of a compensation method of a common voltage compensation circuit according to an embodiment of the present invention;
FIG. 5 is a flowchart of a method for adjusting a gain factor and a compensation factor according to an embodiment of the present invention;
fig. 6 is a second flowchart of a method for adjusting a gain multiple and a compensation multiple according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a display panel according to an embodiment of the present invention.
Detailed Description
The following describes specific embodiments of a common voltage compensation circuit, a compensation method, a display panel, and a display device according to embodiments of the present invention in detail with reference to the accompanying drawings.
An embodiment of the present invention provides a common voltage compensation circuit, as shown in fig. 1, which may include: the device comprises a first conversion module 01, a processing module 02, a second conversion module 03 and a decoding module 04; wherein,
the first conversion module 01 is used for performing analog-to-digital conversion on the common voltage analog signal of the sampling point to generate a corresponding sampling value and outputting the sampling value to the processing module 02; the decoding module 04 is configured to generate a standard value corresponding to the common voltage data signal from the common voltage data signal input by the data bus, and output a preset compensation multiple, a preset gain multiple, and the generated standard value to the processing module 02; the processing module 02 is configured to determine a compensation value for compensating the common voltage signal according to the sampling value input by the first conversion module 01 and the standard value, the compensation multiple and the gain multiple input by the decoding module 04, and output the compensation value to the second conversion module 03; the second conversion module 03 is configured to perform digital-to-analog conversion on the compensation value output by the processing module 02 and output the compensation value to a compensation point.
According to the public voltage compensation circuit provided by the embodiment of the invention, the public voltage analog signal of the sampling point is converted into the digital signal sampling value through the first conversion module, the processing module calculates according to the sampling value and the standard value generated by the decoding module, the preset gain multiple and the compensation multiple to determine the signal for public voltage compensation, and then the compensation signal is converted into the analog quantity through the second conversion module and output to the compensation point, so that the real-time compensation of the public voltage on the display panel is realized, namely different compensation values can be determined and compensated aiming at the compensation points in different areas; meanwhile, the public voltage signal is transmitted to the decoding module through a data bus in the transmission process by adopting a digital quantity, so that the accuracy of the public voltage signal value in long-distance transmission can be ensured, the occurrence of large loss is avoided, the analog quantity of the public voltage signal is converted into the digital quantity, the calculation and the comparison are easy to realize, and the design implementation and the operation processing of the public voltage compensation circuit are facilitated.
In a specific implementation, in the common voltage compensation circuit provided in the embodiment of the present invention, the processing module may be specifically configured to: according to the sampling value, the standard value, the gain multiple and the compensation multiple, determining a compensation value for compensating the common voltage signal according to a preset calculation formula and outputting the compensation value to a second conversion module; wherein, the preset calculation formula is as follows: z ═ I X Y-T (X-I X Y); wherein Z is a compensation value; x is a sampling value; y is a standard value; t is a compensation multiple, and the initial value of T is a preset value T0; i is the gain multiple of the standard value Y, and the initial value of I is 1. Specifically, the processing module is used for calculating a compensation value for compensating the common voltage, the specific calculation mode can adopt the above calculation formula, and then the corresponding compensation value can be calculated according to the sampling values of the sampling points at different positions on the display panel, and then the compensation value can be compensated to the corresponding compensation point in real time, so that the compensation of the common voltage of the display panel can be realized, and the display effect of the display panel is improved.
In specific implementation, as shown in fig. 2, the common voltage compensation circuit provided in the embodiment of the present invention may further include: a compensation adjustment module 05; the compensation adjusting module 05 is configured to compare the absolute value of the difference between the sampling value and the standard value with a first preset value, determine whether the absolute value of the difference is smaller than the first preset value, and if so, output the compensation value determined by the processing module 02 to the second converting module 03; if not, judging whether the difference value is larger than a first preset value, if so, outputting a first control signal to the decoding module 04, otherwise, outputting a second control signal to the decoding module 04; the decoding module 04 is configured to increase the gain multiple and increase the compensation multiple when receiving the first control signal; upon receiving the second control signal, the gain factor is decreased and the compensation factor is increased.
Specifically, in the common voltage compensation circuit provided in the embodiment of the present invention, whether the deviation between the sampling value and the standard value is large may be determined by the compensation adjustment module, and when the absolute value of the difference between the sampling value and the standard value does not exceed the first preset value, the compensation point is directly compensated by the compensation value determined by the processing module; when the absolute value of the difference value between the sampling value and the standard value exceeds a first preset value, the deviation between the common voltage signal value of the sampling point and the standard value is large, the compensation value needs to be increased, the compensation value is input to the compensation point, and the common voltage signal with the large deviation is restored to the standard value as soon as possible. Therefore, in this case, the compensation adjustment module correspondingly outputs the first control signal and the second control signal to the decoding module according to the comparison result between the difference value and the first preset value, and the decoding module correspondingly adjusts the gain multiple and the compensation multiple when receiving the first control signal and the second control signal respectively, so as to change the compensation value for compensation, so that the compensation value input to the compensation point can restore the common voltage signal deviating from the standard value to the standard value as soon as possible.
In specific implementation, as shown in fig. 2, the common voltage compensation circuit provided in the embodiment of the present invention may further include: a compensation adjustment module 05; the compensation adjustment module 05 is configured to compare an absolute value of a difference between the sampling value and the standard value with a second preset value, a third preset value, and a fourth preset value;
judging whether the absolute value of the difference value is smaller than a second preset value or not, if so, executing a first step; otherwise, executing the second step;
the first step, the compensation value determined by the processing module 02 is output to the second conversion module 03;
a second step of judging whether the absolute value of the difference value is larger than a third preset value, if so, executing the third step, otherwise, executing the fourth step;
step three, judging whether the difference value is larger than a third preset value, if so, executing the step five, otherwise, executing the step six;
a fourth step of judging whether the absolute value of the difference is larger than a fourth preset value and smaller than a third preset value, if so, executing the seventh step, otherwise, executing the eighth step;
a fifth step of outputting a third control signal to the decoding module 04;
a sixth step of outputting a fourth control signal to the decoding module 04;
a seventh step of judging whether the difference value is larger than a fourth preset value and smaller than a third preset value, if so, executing the ninth step, otherwise, executing the tenth step;
the eighth step of judging whether the absolute value of the difference is larger than the second preset value and smaller than the fourth preset value, if so, executing the eleventh step, otherwise, executing the twelfth step;
a ninth step of outputting a fifth control signal to the decoding module 04;
a tenth step of outputting a sixth control signal to the decoding module 04;
eleventh, outputting a seventh control signal to the decoding module 04;
a twelfth step of outputting an eighth control signal to the decoding module 04;
the decoding module 04 is configured to adjust the gain multiple to the first gain multiple and increase the compensation multiple when receiving the third control signal; when a fourth control signal is received, the gain multiple is adjusted to be a second gain multiple, and the compensation multiple is increased; when a fifth control signal is received, adjusting the gain multiple to a third gain multiple and increasing the compensation multiple; when a sixth control signal is received, the gain multiple is adjusted to be a fourth gain multiple, and the compensation multiple is increased; when a seventh control signal is received, adjusting the gain multiple to a fifth gain multiple, and increasing the compensation multiple; and when the eighth control signal is received, adjusting the gain multiple to a sixth gain multiple and increasing the compensation multiple.
Specifically, in the common voltage compensation circuit provided in the embodiment of the present invention, whether the deviation between the sampling value and the standard value is large may be determined by the compensation adjustment module, and when the absolute value of the difference between the sampling value and the standard value does not exceed the second preset value, the compensation point is directly compensated by the compensation value determined by the processing module; when the absolute value of the difference value between the sampling value and the standard value exceeds a second preset value, the deviation between the common voltage signal value of the sampling point and the standard value is large, the compensation value needs to be increased, the compensation value is input to the compensation point, and the common voltage signal with the large deviation is restored to the standard value as soon as possible. Therefore, in this case, the compensation adjustment module correspondingly outputs the third control signal, the fourth control signal, the fifth control signal, the sixth control signal, the seventh control signal and the eighth control signal to the decoding module according to the comparison result between the difference value and the second preset value, the third preset value and the fourth preset value (the second preset value < the fourth preset value < the third preset value), and the decoding module correspondingly adjusts the gain multiple and the compensation multiple when receiving the third control signal, the fourth control signal, the fifth control signal, the sixth control signal, the seventh control signal and the eighth control signal, respectively, so as to change the compensation value for compensation, so that the compensation value input to the compensation point can restore the standard value of the common voltage signal deviating from the standard value as soon as possible.
In a specific implementation, as shown in fig. 3, in the common voltage compensation circuit provided in the embodiment of the present invention, the decoding module may specifically include: a decoding unit 041 and a gain adjustment unit 042; the decoding unit 041 is configured to decode the common voltage data signal input by the data bus to generate a standard value; the gain adjustment unit 042 is configured to adjust the gain multiple and increase the compensation multiple when receiving the corresponding control signal input by the compensation adjustment module 05. Specifically, the decoding module generates a standard value through the decoding unit, and adjusts the gain multiple and the compensation multiple through the gain adjusting unit, so as to change the compensation value, so that the compensation value input to the compensation point can restore the common voltage signal deviating from the standard value to the standard value as soon as possible.
In a specific implementation, in the common voltage compensation circuit provided in the embodiment of the present invention, the gain adjustment unit is further configured to initialize the compensation multiple and the gain multiple after the second conversion module outputs the compensation value to the compensation point. Specifically, in the common voltage compensation circuit provided in the embodiment of the present invention, when the deviation between the sampling value and the standard value is large, the compensation adjustment module is required to control the decoding module to change the gain multiple and the compensation multiple, so as to change the compensation value and complete the compensation function, however, before performing the next compensation, the compensation multiple and the gain multiple need to be initialized, so that the compensation multiple and the gain multiple return to the initial values, so as to avoid affecting the next compensation.
In specific implementation, as shown in fig. 3, the common voltage compensation circuit provided in the embodiment of the present invention may further include: an input buffer module 06 and an output buffer module 07; the input buffer module 06 is configured to receive and buffer a common voltage data signal input by the data bus, and output the common voltage data signal to the decoding module 04; the output buffer module 07 is configured to buffer the signal output by the second conversion module 03 and output the signal to a compensation point. Specifically, the input buffer module and the output buffer module can be implemented by using an input buffer and an output buffer in the prior art, and the specific functions and structures of the input buffer module and the output buffer module are the same as those in the prior art, and are not described in detail herein.
Based on the same inventive concept, an embodiment of the present invention provides a compensation method for the common voltage compensation circuit, as shown in fig. 4, the compensation method may specifically include:
s101, carrying out analog-to-digital conversion on the common voltage analog signals of the sampling points to generate corresponding sampling values;
s102, generating a standard value corresponding to a common voltage data signal from the common voltage data signal input by the data bus;
s103, determining a compensation value for compensating the common voltage signal according to the sampling value, the standard value, the preset compensation multiple and the gain multiple;
and S104, performing digital-to-analog conversion on the compensation value and outputting the compensation value to a compensation point.
Specifically, a common voltage analog signal of a sampling point is converted into a digital signal sampling value, calculation is carried out according to the sampling value, a standard value, a preset gain multiple and a compensation multiple, a signal for common voltage compensation is determined, and then the compensation signal is converted into an analog quantity to be output to a compensation point, so that real-time compensation of common voltage on a display panel is realized, namely different compensation values can be determined and compensated aiming at compensation points in different areas; meanwhile, the public voltage signal is transmitted by adopting a digital quantity in the transmission process, so that the accuracy of the public voltage signal value in long-distance transmission can be ensured, the occurrence of larger loss is avoided, the analog quantity of the public voltage signal is converted into the digital quantity, the calculation and the comparison are easy to realize, and the design implementation and the operation processing of the public voltage compensation circuit are convenient.
In specific implementation, the compensation method of the common voltage compensation circuit provided in the embodiment of the present invention, without being limited by S103, may specifically include: determining a compensation value for compensating the common voltage signal according to a preset calculation formula according to the sampling value, the standard value, the gain multiple and the compensation multiple; wherein, the preset calculation formula is as follows: z ═ I X Y-T (X-I X Y); wherein Z is a compensation value; x is a sampling value; y is a standard value; t is a compensation multiple, and the initial value of T is a preset value T0; i is the gain multiple of the standard value Y, and the initial value of I is 1. Specifically, the value of I may be set to 0.5 to 1.1, may be set at 0.1 intervals, T may be an empirical value obtained by experiment, generally 0 to 50, may be set at 10 intervals, and specifically, the values of I and T are set as necessary in practical use and are not limited herein. The above calculation formula can be adopted in specific implementation, and then the corresponding compensation value can be calculated according to the sampling values of the sampling points at different positions on the display panel, and then the compensation value can be compensated to the corresponding compensation point in real time, so that the compensation of the public voltage of the display panel can be realized, and the display effect of the display panel is improved.
Specifically, in the compensation method of the common voltage compensation circuit provided in the embodiment of the present invention, if the deviation between the sampling value and the standard value is large, the compensation value may be changed by adjusting the gain multiple and the compensation multiple, so that the common voltage signal at the compensation point may be quickly restored to the standard value, and the specific adjustment process may adopt the following two implementation manners:
the implementation mode is as follows: in a specific implementation, the compensation method of the common voltage compensation circuit provided in the embodiment of the present invention may further include: comparing the absolute value of the difference between the sampling value and the standard value with a first preset value, as shown in fig. 5, specifically includes:
s1, judging whether the absolute value of the difference value P is smaller than a first preset value m1, if so, executing a step S2; otherwise, executing step S3;
s2, outputting the compensation value determined by the processing module to a second conversion module;
s3, judging whether the difference value P is larger than a first preset value m1, if so, executing a step S4, otherwise, executing a step S5;
s4, outputting the first control signal to a decoding module, wherein the decoding module increases the gain multiple and the compensation multiple when receiving the first control signal;
and S5, outputting the second control signal to the decoding module, and when the decoding module receives the second control signal, reducing the gain multiple and increasing the compensation multiple.
Specifically, the compensation formula is Z ═ I × Y-T (X-I × Y), m1 is set to 2, X ═ 7, Y ═ 8.5, and the initial gain multiple I is set to0And initial compensation multiple T0If all the symbols are initially 1, then | X-Y | ═ 1.5<M1, the absolute value of the difference between X and Y is less than the first preset value, i.e. the common value of the samplesThe deviation of the common voltage signal from the standard value is small, and within a reasonable deviation range, I is I0＝1，T＝T0When the formula is substituted, Z is 10; if X is 10, Y is 8.5, and the absolute value of the difference between X and Y is smaller than a first preset value, that is, the deviation between the sampled common voltage signal and the standard value is small, and is within a reasonable deviation range, the formula Z is substituted into 7, that is, the compensation value for compensating the common voltage is 7;
when m1 is 2, X is 6, and Y is 8.5, then | X-Y |, 2.5>2-m 1, X and Y were judged to be too far off, since X-Y-2.5<2, so the gain factor needs to be reduced, take I<I0And need to ensure | X-I X Y non-calculation<m1, since X is smaller than Y, X is also ensured<I X Y, i.e. 0.71<I<0.94, when I is 0.92, Z is 7.82+1.82 × T, and the compensation factor needs to be adjusted to T>T01, and Z-I Y is required to be ensured>m1, i.e. 7.82+ 1.82T-7.82>2 gives T>1.11, therefore, if T is 5, Z is 7.82+1.82 × 5 is 16.92, and the larger T is, the larger the compensation value Z is, and the smaller the X value is quickly compensated;
when m1 is 2, X is 12, and Y is 8.5, then | X-Y | is 3.5>M1, X is judged to be too far from Y because X-Y is 3.5>2, so take I>I0And must ensure | X-I Y<m1, since X is larger than Y, X is ensured>I X Y, namely 1.18<I<1.41, when I is 1.2, Z is 10.2-1.8T, and T is T>T01 and the value of T must be such that Z-I Y<M1, i.e. T>1.11, if T is 5, Z is 1.2, and the larger T is, the smaller the compensation value Z is, so that an excessively large X value can be compensated quickly;
in summary, the compensation values of the gain multiple I and the compensation multiple T after adjustment enable the common voltage deviating from the standard value to be restored to the standard value as soon as possible. The above is only that simply setting the values indicates that the absolute value of the difference between the compensation value and the standard value is larger after the gain multiple and the compensation multiple are adjusted, so that the common voltage can be compensated with a larger compensation force, so that the common voltage deviating from the standard value can be quickly restored to the standard value, and the value of X, Y, Z, I, T in practical application is not limited to the above-mentioned example values.
The implementation mode two is as follows: in a specific implementation, the compensation method of the common voltage compensation circuit provided in the embodiment of the present invention may further include: comparing the absolute value of the difference P between the sampling value and the standard value with the second preset value, the third preset value, and the fourth preset value, as shown in fig. 6, specifically includes:
s11, judging whether the absolute value of the difference value P is smaller than a second preset value m2, if so, executing a step S12, otherwise, executing a step S13;
s12, outputting the compensation value determined by the processing module to a second conversion module;
s13, judging whether the absolute value of the difference value P is larger than a third preset value m3, if so, executing a step S14, otherwise, executing a step S15;
s14, judging whether the difference value P is larger than a third preset value m3, if so, executing a step S16, otherwise, executing a step S17;
s15, judging whether the absolute value of the difference value P is larger than a fourth preset value m4 and smaller than a third preset value m3, if so, executing S18, otherwise, executing S19;
s16, outputting a third control signal to the decoding module, wherein the decoding module adjusts the gain multiple to a first gain multiple I1 and increases the compensation multiple when receiving the third control signal;
s17, outputting a fourth control signal to the decoding module, wherein the decoding module adjusts the gain multiple to a second gain multiple I2 and increases the compensation multiple when receiving the fourth control signal;
s18, judging whether the difference value P is larger than a fourth preset value m4 and smaller than a third preset value m3, if so, executing S20, otherwise, executing S21;
s19, judging whether the absolute value of the difference value P is larger than the second preset value m2 and smaller than the fourth preset value m4, if so, executing S22, otherwise, executing S23;
s20, outputting a fifth control signal to the decoding module, wherein the decoding module adjusts the gain multiple to a third gain multiple I3 and increases the compensation multiple when receiving the fifth control signal;
s21, outputting a sixth control signal to the decoding module, wherein the decoding module adjusts the gain multiple to a fourth gain multiple I4 and increases the compensation multiple when receiving the sixth control signal;
s22, outputting a seventh control signal to the decoding module, wherein the decoding module adjusts the gain multiple to a fifth gain multiple I5 and increases the compensation multiple when receiving the seventh control signal;
and S23, outputting an eighth control signal to the decoding module, wherein the decoding module adjusts the gain multiple to a sixth gain multiple I6 and increases the compensation multiple when receiving the eighth control signal.
Specifically, if a multi-gear preset value is set, the analysis idea is the same as the basic algorithm idea for setting a preset value, and an algorithm process for analyzing two-gear preset values is taken as an example for explanation;
when m3 is 4, m2 is 2, X is 7, and Y is 8.5, then | X-Y | is 1.5<M2, and if the deviation between X and Y is determined to be in a reasonable range, I is I0＝1，T＝T0When the formula is substituted, Z is 10; likewise, if X is 10 and Y is 8.5, then the formula Z is 7;
when X is 6 and Y is 8.5, m3 is 4, m2 is 2, and m3 is 4>|X-Y|＝2.5>2-m 2, X and Y were judged to be too far off, since X-Y-2.5<2, so take I<I0And must ensure | X-I Y<m2, since X is smaller than Y, X is ensured<I X Y, i.e. 0.71<I<0.94, if I is 0.92, Z is 7.82+1.82 × T, then T is taken>T01 and ensures Z-I Y>m3, i.e. 7.82+ 1.82T-7.82>4, obtaining T>2.2, therefore, if T is 5, Z is 7.82+1.82 × 5 is 16.92, and the larger T is, the larger the compensation value Z is, so that too small a fast compensation can be madeThe value of X of (A); when X is 4 and Y is 8.5, | X-Y | -4.5>M3, X is judged to be too far from Y because X-Y is-4.5<4, so take I<I0And must ensure | X-I Y<m2, since X is smaller than Y, X is ensured<I X Y, namely 0.47<I<0.71, if I is 0.68, Z is 5.78+1.78 × T, then T is taken>T01 and ensures Z-I Y>m3, i.e. T>2.25, if T is 10, Z is 23.58; since the deviation of X-Y is larger under the condition of X-4, Y-8.5, the Z value under the condition of X-4, Y-8.5 must be larger than that under the condition of X-6, Y-8.5, so two levels of T values are defined under the conditions of X-4, Y-8.5 and X-6, Y-8.5, T values may be set separately in advance;
when X is 12 and Y is 8.5, m3 is 4, m2 is 2, m3 is 4>|X-Y|＝3.5>M2, X is judged to be too far from Y because X-Y is 3.5>2, so take I>I0And must ensure | X-I Y<m2, since X is larger than Y, X is ensured>I X Y, i.e. 1.18<I<1.41, if I is 1.2, so Z is 10.2-1.8 × T, then T is taken>T01 and the value of T must be such that Z-I Y<M2, i.e. T>1.11, if T is 5, Z is 1.2; when X is 13 and Y is 8.5, then | X-Y |, 4.5>M3, X is judged to be too far from Y because X-Y is 4.5>2, so take I>I0And must ensure | X-I Y<m2, since X is larger than Y, X is ensured>I X Y, i.e. 1.29<I<1.53, if I is 1.4, Z is 11.9-1.1T, then T is taken>T01 and the value of T must be such that Z-I Y<M2, i.e. T>1.82, if T is 10, Z is 0.9; since X-Y varies more under the condition of X-13 and Y-8.5, the value of Z under the condition of X-13 and Y-8.5 must be smaller than that under the condition of X-12 and Y-8.5, so that two levels of T values are defined under the conditions of X-13, Y-8.5 and X-12 and Y-8.5, and T values are predetermined discrete values;
the above is only the extended algorithm analysis for setting the preset values of the two gears, and if more gears are set, the analysis idea is the same as the two-gear algorithm idea, and the analysis process is not exemplified here.
It should be noted that, in the above example, only under the condition that the deviation between the sampled common voltage value and the standard value can be adjusted, in practical application, when an abnormal condition occurs, for example, the deviation between the sampled common voltage value and the standard value exceeds an adjustable range (for example, a safety adjustment value is set, and when the deviation exceeds the adjustable range), so that the display panel has abnormal display, or even cannot realize a normal display function, the common voltage compensation circuit provided in the embodiment of the present invention does not adjust the gain multiple and the compensation multiple any more, and the display panel correspondingly starts the self-protection mechanism adjustment, for example, resetting or initializing the common voltage input to the display area of the display panel, or performing operations such as shutdown and restart, and the like, which is not limited herein.
It should be noted that the above two implementation manners are only examples, and the adjustment of the gain multiple and the compensation multiple may be implemented by other implementation manners, which is not limited herein.
In a specific implementation, the compensation method of the common voltage compensation circuit provided in the embodiment of the present invention may further include: after the compensation value is output to the compensation point, the compensation multiple and the gain multiple are initialized. Specifically, when the deviation between the sampling value and the standard value is large, the compensation adjustment module is required to control the decoding module to change the gain multiple and the compensation multiple, so as to change the compensation value to complete the compensation function, however, before the next compensation, the compensation multiple and the gain multiple need to be initialized, so that the compensation multiple and the gain multiple return to the initial values, so as to avoid affecting the next compensation.
Based on the same inventive concept, an embodiment of the present invention provides a display panel, as shown in fig. 7, which may include: a timing controller 08, and the common voltage compensation circuit 09 provided in the embodiment of the present invention; the timing controller 08 is configured to input a common voltage signal to a common electrode of the display panel, perform analog-to-digital conversion on the standard common voltage signal, and output the standard common voltage signal to the common voltage compensation circuit 09 through a data bus; the common voltage compensation circuit 09 is configured to determine and compensate a common voltage compensation signal according to a signal input by the timing controller and the sampled common voltage signal. Specifically, the transmission process of the common voltage signal is to directly access the common voltage signal to the near end of the display panel through the timing controller, and to spread the common voltage signal over the entire display panel through the common electrode on the display panel. The time sequence controller can also carry out analog-to-digital conversion on the standard public voltage value to convert the standard public voltage value into digital quantity, and the digital quantity is transmitted to the public voltage compensation circuit through the data line, so that the public voltage compensation circuit can determine and compensate the public voltage compensation signal according to the digital quantity signal input by the time sequence controller and the sampled public voltage signal.
In practical implementation, in the display panel provided in the embodiment of the present invention, as shown in fig. 7, the timing controller 08 may specifically include: a common voltage generation unit 081 and an analog-to-digital conversion unit 082; wherein the common voltage generating unit 081 is used to input a common voltage signal to a common electrode of the display panel; the analog-to-digital conversion unit 082 is used for converting the common voltage analog signal into a common voltage data signal and outputting the common voltage data signal to the common voltage compensation circuit 09 through the data bus. Specifically, the timing controller generates a common voltage signal through the common voltage generating unit and outputs the common voltage signal to the display panel, and converts the common voltage analog signal into a digital signal through the analog-to-digital converting unit and outputs the digital signal to the common voltage compensating circuit to compensate the common voltage.
In a specific implementation, as shown in fig. 7, the display panel provided in the embodiment of the present invention may further include: a plurality of gate driving chips 10; the number of the common voltage compensation circuits 09 is plural; the plurality of common voltage compensation circuits 09 are respectively integrated into the plurality of gate driver chips 10. Specifically, the common voltage compensation circuit with compensation function can be integrated into the gate driving chip, and the number and position of compensation points of the common voltage are determined according to the size of the display panel and the number of the gate driving chips, so that the whole display panel is subjected to partition compensation. Therefore, the display panel can be divided into N areas, the compensation position is 2N, the actual common voltage at each position is different, the compensation multiple is different, and the final effect is that 2N points are equal after compensating the common voltage through the common voltage compensation circuit. Generally, the gate driving chip is bound on the left and right sides of the display panel through glue, and the common voltage compensation circuit is integrated in the gate driving chip, so that the sampling point An and the compensation point Bn appear together in pairs, generally at a position within 5 cm from the edge on the display panel, and if necessary, can also be arranged at a position 1/4 or 1/8 in the transverse direction of the panel, and the corresponding position can be flexibly selected according to implementation and application, without limitation. Compared with the prior art that the compensation circuit is arranged on the time schedule controller, for example, a 55-inch display panel is taken, the farthest acquisition point and the compensation point of the compensation circuit are more than 1 m away from the compensation circuit, and the larger the size of the display panel is, the larger the distance value is, even the distance value can reach 2-3 m.
In a specific implementation, in the display panel provided in the embodiment of the present invention, the second conversion module in the common voltage compensation circuit may be disposed in a peripheral area of the display panel. Specifically, the second conversion module may be disposed in a peripheral area of the display panel at a position near the compensation point, so that a distance between the second conversion module and the compensation point is shortened, and the compensation signal output by the second conversion module does not need to be transmitted over a long distance and then output to the compensation point, thereby ensuring reliability of signal transmission between the second conversion module and the compensation point.
Based on the same inventive concept, the embodiment of the invention provides a display device, which comprises the display panel. The display device can be applied to any product or component with a display function, such as a mobile phone, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Since the principle of the display device to solve the problem is similar to that of the display panel, the display device can be implemented by the display panel, and repeated descriptions are omitted.
The embodiment of the invention provides a common voltage compensation circuit, a compensation method, a display panel and a display device, wherein a first conversion module in the common voltage compensation circuit performs analog-to-digital conversion on a common voltage analog signal of a sampling point to generate a corresponding sampling value and outputs the sampling value to a processing module; the decoding module decodes the public voltage data signal input by the data bus to generate a standard value, and outputs a preset compensation multiple, a preset gain multiple and the generated standard value to the processing module; the processing module determines a compensation value for compensating the common voltage signal according to the sampling value, the standard value, the compensation multiple and the gain multiple and outputs the compensation value to the second conversion module; and the second conversion module performs digital-to-analog conversion on the compensation value output by the processing module and outputs the compensation value to a compensation point.
Specifically, a common voltage analog signal of a sampling point is converted into a digital signal sampling value through a first conversion module, a processing module calculates according to the sampling value and a standard value, a preset gain multiple and a preset compensation multiple generated by a decoding module to determine a signal for common voltage compensation, and then the compensation signal is converted into an analog quantity through a second conversion module and output to a compensation point, so that real-time compensation of common voltage on a display panel is realized, and different compensation values can be determined and compensated aiming at compensation points in different areas; meanwhile, the public voltage signal is transmitted to the decoding module through a data bus in the transmission process by adopting a digital quantity, so that the accuracy of the public voltage signal value in long-distance transmission can be ensured, the occurrence of large loss is avoided, the analog quantity of the public voltage signal is converted into the digital quantity, the calculation and the comparison are easy to realize, and the design implementation and the operation processing of the public voltage compensation circuit are facilitated.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (17)

1. A common voltage compensation circuit, comprising: the device comprises a first conversion module, a processing module, a second conversion module and a decoding module; wherein,
the first conversion module is used for carrying out analog-to-digital conversion on the common voltage analog signal of the sampling point, generating a corresponding sampling value and outputting the sampling value to the processing module;
the decoding module is used for generating a standard value corresponding to a common voltage data signal from the common voltage data signal input by the data bus, and outputting a preset compensation multiple, a preset gain multiple and the generated standard value to the processing module;
the processing module is used for determining a compensation value for compensating a common voltage signal according to the sampling value input by the first conversion module and the standard value, the compensation multiple and the gain multiple input by the decoding module and outputting the compensation value to the second conversion module;
and the second conversion module is used for performing digital-to-analog conversion on the compensation value output by the processing module and outputting the compensation value to a compensation point.
2. The common voltage compensation circuit of claim 1, wherein the processing module is specifically configured to: according to the sampling value, the standard value, the gain multiple and the compensation multiple, determining a compensation value for compensating a common voltage signal according to a preset calculation formula and outputting the compensation value to the second conversion module; wherein, the preset calculation formula is as follows:
Z＝I*Y-T*(X-I*Y)；
wherein Z is a compensation value; x is a sampling value; y is a standard value; t is a compensation multiple, and the initial value of T is a preset value T0; i is the gain multiple of the standard value Y, and the initial value of I is 1.
3. The common voltage compensation circuit of claim 2, further comprising: a compensation adjustment module;
the compensation adjusting module is used for comparing the absolute value of the difference between the sampling value and the standard value with a first preset value, judging whether the absolute value of the difference is smaller than the first preset value or not, and if so, outputting the compensation value determined by the processing module to the second conversion module; if not, judging whether the difference value is larger than the first preset value, if so, outputting a first control signal to the decoding module, otherwise, outputting a second control signal to the decoding module;
the decoding module is used for increasing a gain multiple and a compensation multiple when receiving the first control signal; upon receiving the second control signal, decreasing a gain factor and increasing a compensation factor.
4. The common voltage compensation circuit of claim 2, further comprising: a compensation adjustment module;
the compensation adjustment module is used for comparing the absolute value of the difference value between the sampling value and the standard value with a second preset value, a third preset value and a fourth preset value;
judging whether the absolute value of the difference value is smaller than the second preset value or not, if so, executing a first step; otherwise, executing the second step;
a first step of outputting the compensation value determined by the processing module to the second conversion module;
a second step of judging whether the absolute value of the difference value is larger than a third preset value or not, if so, executing the third step, otherwise, executing the fourth step;
a third step of judging whether the difference value is larger than a third preset value, if so, executing a fifth step, otherwise, executing a sixth step;
a fourth step of judging whether the absolute value of the difference value is larger than a fourth preset value and smaller than a third preset value, if so, executing the seventh step, otherwise, executing the eighth step;
a fifth step of outputting a third control signal to the decoding module;
a sixth step of outputting a fourth control signal to the decoding module;
a seventh step of judging whether the difference value is larger than the fourth preset value and smaller than the third preset value, if so, executing a ninth step, otherwise, executing a tenth step;
an eighth step of judging whether the absolute value of the difference is larger than the second preset value and smaller than the fourth preset value, if so, executing an eleventh step, otherwise, executing a twelfth step;
a ninth step of outputting a fifth control signal to the decoding module;
a tenth step of outputting a sixth control signal to the decoding module;
eleventh, outputting a seventh control signal to the decoding module;
a twelfth step of outputting an eighth control signal to the decoding module;
the decoding module is used for adjusting the gain multiple to a first gain multiple and increasing a compensation multiple when the third control signal is received; when the fourth control signal is received, adjusting the gain multiple to a second gain multiple, and increasing a compensation multiple; when the fifth control signal is received, adjusting the gain multiple to a third gain multiple, and increasing a compensation multiple; when the sixth control signal is received, adjusting the gain multiple to a fourth gain multiple, and increasing a compensation multiple; when the seventh control signal is received, adjusting the gain multiple to a fifth gain multiple, and increasing a compensation multiple; and when the eighth control signal is received, adjusting the gain multiple to a sixth gain multiple and increasing a compensation multiple.
5. The common voltage compensation circuit according to claim 3 or 4, wherein the decoding module specifically comprises: a decoding unit and a gain adjustment unit;
the decoding unit is used for generating a common voltage data signal input by a data bus into a standard value corresponding to the common voltage line data signal;
the gain adjusting unit is used for correspondingly adjusting the gain multiple and correspondingly increasing the compensation multiple when receiving the corresponding control signal input by the compensation adjusting module.
6. The common voltage compensation circuit of claim 5, wherein the gain adjustment unit is further configured to initialize the compensation multiple and the gain multiple after the second conversion module outputs the compensation value to a compensation point.
7. The common voltage compensation circuit of claim 6, further comprising: the input buffer module and the output buffer module; wherein,
the input buffer module is used for receiving and buffering a common voltage data signal input by the data bus and outputting the common voltage data signal to the decoding module;
and the output buffer module is used for buffering the signal output by the second conversion module and outputting the signal to a compensation point.
8. A compensation method of a common voltage compensation circuit according to any one of claims 1 to 7, comprising:
carrying out analog-to-digital conversion on the common voltage analog signal of the sampling point to generate a corresponding sampling value;
generating a standard value corresponding to a common voltage data signal from a common voltage data signal input by a data bus;
determining a compensation value for compensating the common voltage signal according to the sampling value, the standard value, a preset compensation multiple and a gain multiple;
and D/A converting the compensation value and outputting the converted compensation value to a compensation point.
9. The method according to claim 8, wherein determining a compensation value for compensating the common voltage signal according to the sampling value, the standard value, a predetermined compensation multiple and a gain multiple comprises:
determining a compensation value for compensating the common voltage signal according to a preset calculation formula according to the sampling value, the standard value, the gain multiple and the compensation multiple; wherein, the preset calculation formula is as follows:
Z＝I*Y-T*(X-I*Y)；
wherein Z is a compensation value; x is a sampling value; y is a standard value; t is a compensation multiple, and the initial value of T is a preset value T0; i is the gain multiple of the standard value Y, and the initial value of I is 1.
10. The compensation method of the common voltage compensation circuit according to claim 9, further comprising:
comparing the absolute value of the difference between the sampling value and the standard value with a first preset value, judging whether the absolute value of the difference is smaller than the first preset value, if so, outputting the compensation value determined by the processing module to the second conversion module; if not, judging whether the difference value is larger than the first preset value, if so, outputting a first control signal to the decoding module, otherwise, outputting a second control signal to the decoding module;
increasing the gain factor and increasing a compensation factor when the first control signal is received; upon receiving the second control signal, decreasing the gain factor and increasing a compensation factor.
11. The compensation method of the common voltage compensation circuit according to claim 9, further comprising:
comparing the absolute value of the difference between the sampling value and the standard value with a second preset value, a third preset value and a fourth preset value;
judging whether the absolute value of the difference value is smaller than the second preset value or not, if so, executing a first step; otherwise, executing the second step;
a first step of outputting the compensation value determined by the processing module to the second conversion module;
a second step of judging whether the absolute value of the difference value is larger than a third preset value or not, if so, executing the third step, otherwise, executing the fourth step;
a third step of judging whether the difference value is larger than a third preset value, if so, executing a fifth step, otherwise, executing a sixth step;
a fourth step of judging whether the absolute value of the difference value is larger than a fourth preset value and smaller than a third preset value, if so, executing the seventh step, otherwise, executing the eighth step;
a fifth step of outputting a third control signal to the decoding module;
a sixth step of outputting a fourth control signal to the decoding module;
a seventh step of judging whether the difference value is larger than the fourth preset value and smaller than the third preset value, if so, executing a ninth step, otherwise, executing a tenth step;
an eighth step of judging whether the absolute value of the difference is larger than the second preset value and smaller than the fourth preset value, if so, executing an eleventh step, otherwise, executing a twelfth step;
a ninth step of outputting a fifth control signal to the decoding module;
a tenth step of outputting a sixth control signal to the decoding module;
eleventh, outputting a seventh control signal to the decoding module;
a twelfth step of outputting an eighth control signal to the decoding module;
when the third control signal is received, adjusting the gain multiple to a first gain multiple and increasing a compensation multiple; when the fourth control signal is received, adjusting the gain multiple to a second gain multiple, and increasing a compensation multiple; when the fifth control signal is received, adjusting the gain multiple to a third gain multiple, and increasing a compensation multiple; when the sixth control signal is received, adjusting the gain multiple to a fourth gain multiple, and increasing a compensation multiple; when the seventh control signal is received, adjusting the gain multiple to a fifth gain multiple, and increasing a compensation multiple; and when the eighth control signal is received, adjusting the gain multiple to a sixth gain multiple and increasing a compensation multiple.
12. A compensation method of a common voltage compensation circuit according to claim 10 or 11, further comprising: initializing the compensation multiple and the gain multiple after the compensation value is output to a compensation point.
13. A display panel, comprising: a timing controller, and the common voltage compensation circuit according to any one of claims 1 to 7; wherein,
the time sequence controller is used for inputting a common voltage signal to a common electrode of the display panel, and outputting a standard common voltage signal to the common voltage compensation circuit through a data bus after performing analog-to-digital conversion on the standard common voltage signal;
and the common voltage compensation circuit is used for determining and compensating a common voltage compensation signal according to the signal input by the time sequence controller and the sampled common voltage signal.
14. The display panel according to claim 13, wherein the timing controller specifically comprises: a common voltage generating unit and an analog-to-digital converting unit; wherein,
the common voltage generating unit inputs a common voltage signal to a common electrode of the display panel;
the analog-to-digital conversion unit is used for converting the common voltage analog signal into a common voltage data signal and outputting the common voltage data signal to the common voltage compensation circuit through the data bus.
15. The display panel according to claim 13 or 14, further comprising: a plurality of gate driving chips; the number of the common voltage compensation circuits is multiple;
the plurality of common voltage compensation circuits are respectively integrated on the plurality of gate driving chips.
16. The display panel according to claim 13 or 14, wherein the second conversion module in the common voltage compensation circuit is disposed in a peripheral region on the display panel.
17. A display device characterized by comprising the display panel according to any one of claims 13 to 16.
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