CN109377960B - Common voltage regulating circuit and common voltage regulating method - Google Patents
Common voltage regulating circuit and common voltage regulating method Download PDFInfo
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- CN109377960B CN109377960B CN201811535702.4A CN201811535702A CN109377960B CN 109377960 B CN109377960 B CN 109377960B CN 201811535702 A CN201811535702 A CN 201811535702A CN 109377960 B CN109377960 B CN 109377960B
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
Abstract
The invention provides a public voltage regulating circuit and a public voltage regulating method. The common voltage regulating circuit includes: the time schedule controller judges whether the public voltage needs to be compensated or not by monitoring gray scale change of a picture to be displayed of the display panel and according to the gray scale change of the picture to be displayed, and outputs a control signal to the voltage regulation module when the public voltage needs to be compensated so as to control the voltage regulation module to regulate the reference voltage and compensate the public voltage, thereby realizing non-delay real-time compensation of the public voltage, effectively eliminating horizontal crosstalk and improving the display quality.
Description
Technical Field
The invention relates to the technical field of display, in particular to a public voltage regulating circuit and a public voltage regulating method.
Background
With the development of Display technology, flat panel Display devices such as liquid Crystal displays (L liquid Crystal displays, L CDs) have advantages such as high image quality, power saving, thin body, and wide application range, and thus are widely used in various consumer electronics products such as mobile phones, televisions, personal digital assistants, digital cameras, notebook computers, and desktop computers, and are becoming the mainstream of Display devices.
Most of the existing liquid crystal display devices in the market are backlight liquid crystal displays (lcds) including a liquid crystal display panel and a backlight module, in which the liquid crystal display panel includes a Color Filter substrate (CF), an array substrate (TFT), and a liquid crystal (L C, L liquid crystal) sandwiched between the Color Filter substrate and a Thin Film Transistor substrate.
The liquid crystal display panel is internally provided with a plurality of thin film transistors which are arranged in an array, the grid electrode of each row of TFT is correspondingly connected to a grid electrode scanning line in the horizontal direction, the drain electrode of each column of TFT is correspondingly connected to a data line in the vertical direction, the source electrode of each TFT is connected to a pixel electrode, a public electrode is arranged corresponding to the pixel electrode, the public electrode is connected with a public electrode line, public voltage is applied to the public electrode through the public electrode line, each TFT is started in a scanning signal line by line, data voltage is applied to the pixel electrode line by line, and the liquid crystal is driven to rotate through the matching of the public voltage and the data voltage, so that the picture display is realized.
Due to the structural limitation of the liquid crystal display panel, the common voltage is affected by the scanning signal and the data voltage to generate ripples, which causes horizontal crosstalk, and thus, the display picture is reduced. As shown in fig. 1, in order to improve the horizontal crosstalk, the prior art proposes a common voltage adjusting circuit, which includes a digital adjustable resistor DVR ' having one end connected to a power voltage VAA ' and the other end electrically connected to non-inverting inputs of two operational amplifiers OP ', an output of each operational amplifier OP ' outputting a common voltage Vcom ' to a display panel 100 ', an inverting input of each operational amplifier OP ' receiving a feedback voltage Vfb ' of the common voltage Vcom ' from the display panel 100 ', and adjusting the common voltage Vcom ' by the feedback voltage Vfb ' to keep the common voltage Vcom ' stable, as shown in fig. 2, the circuit delays the adjustment of the common voltage Vcom ' from the reception of the feedback voltage Vfb ', in a high-resolution liquid crystal display panel with a short charging time, the delay time may approach or exceed the charging time of a row of sub-pixels, and the circuit will not eliminate the horizontal crosstalk and improve the display quality.
Disclosure of Invention
The invention aims to provide a public voltage regulating circuit which can realize real-time compensation without delay on public voltage, eliminate horizontal crosstalk and improve display quality.
The invention also aims to provide a public voltage adjusting method, which can realize the real-time compensation without delay on the public voltage, eliminate the horizontal crosstalk and improve the display quality.
To achieve the above object, the present invention provides a common voltage adjusting circuit, comprising: the voltage regulation system comprises a voltage generation module, a voltage output module electrically connected with the voltage generation module, a voltage regulation module electrically connected with the voltage output module and the voltage generation module, and a time schedule controller electrically connected with the voltage regulation module;
the voltage generation module is used for receiving power supply voltage and generating reference voltage by using the power supply voltage;
the voltage output module is used for receiving a reference voltage, generating a common voltage according to the reference voltage and inputting the common voltage to the display panel;
the time schedule controller is used for monitoring the gray scale change of a picture to be displayed of the display panel, judging whether the common voltage needs to be compensated according to the gray scale change of the picture to be displayed, and outputting a control signal to the voltage regulating module when the common voltage needs to be compensated;
the voltage adjusting module is used for adjusting the reference voltage under the control of the control signal so as to compensate the common voltage.
And the time schedule controller determines that the public voltage needs to be compensated when the gray scale change of two adjacent lines of sub-pixels in the picture to be displayed exceeds a preset gray scale threshold value.
The time sequence controller outputs a first control signal to the voltage regulation module when the common voltage is determined to need compensation and the gray scale change of two adjacent rows of sub-pixels in a picture to be displayed is changed from high to low;
and the time schedule controller outputs a second control signal to the voltage regulation module when the common voltage is determined to need compensation and the gray scale of two adjacent rows of sub-pixels in the picture to be displayed is changed from low to high.
The voltage regulation module receives a low voltage under the control of a first control signal to pull down the reference voltage by the low voltage;
the voltage regulation module receives a high voltage under the control of a second control signal to pull up the reference voltage by the high voltage.
The voltage generation module includes: a digital adjustable resistor and a first resistor; the first end of the digital adjustable resistor receives a power supply voltage, and the second end of the digital adjustable resistor is electrically connected with the first end of the first resistor; a second end of the first resistor outputs a reference voltage;
the voltage output module includes: a capacitor and at least one operational amplifier; the first end of the capacitor is electrically connected with the second end of the first resistor, and the second end of the capacitor is grounded; the non-inverting input end of each operational amplifier is electrically connected with the second end of the first resistor, the inverting input end of each operational amplifier is electrically connected with the output end of each operational amplifier, and the output ends of the operational amplifiers output common voltage to the display panel;
the voltage regulating module comprises a first triode, a second resistor and a third resistor;
the base electrode of the first triode is electrically connected with the first output end of the time schedule controller for outputting a first control signal, the emitting electrode is electrically connected with the first end of the second resistor, and the collecting electrode is electrically connected with the second end of the first resistor; the second end of the second resistor is connected with low voltage; the base electrode of the second triode is electrically connected with the second output end of the time schedule controller for outputting a second control signal, the emitting electrode is electrically connected with the first end of the third resistor, and the collecting electrode is electrically connected with the second end of the first resistor; and the second end of the third resistor is connected with high voltage.
The preset gray scale threshold is greater than 100.
The invention also provides a public voltage regulating method, which comprises the following steps:
step S1, receiving a power supply voltage, and generating a reference voltage by using the power supply voltage;
step S2, generating a common voltage according to the reference voltage, and inputting the common voltage to the display panel;
step S3, monitoring the gray scale change of the picture to be displayed of the display panel, and judging whether the common voltage needs to be compensated according to the gray scale change of the picture to be displayed;
and step S4, generating a control signal when the common voltage needs to be compensated, and adjusting the reference voltage under the control of the control signal to compensate the common voltage.
In the step S4, when the gray scale variation of two adjacent rows of sub-pixels in the to-be-displayed picture exceeds a preset gray scale threshold, it is determined that the common voltage needs to be compensated.
In the step S4, in the above step,
when the common voltage needs to be compensated and the gray scale of two adjacent rows of sub-pixels in the picture to be displayed changes from high to low, a first control signal is generated, under the control of the first control signal, the reference voltage is connected with a low potential and is pulled down by the low potential, and the common voltage is compensated and kept at a stable potential;
and when the common voltage needs to be compensated and the gray scale of two adjacent rows of sub-pixels in the picture to be displayed changes from low to high, generating a second control signal, wherein under the control of the second control signal, the reference voltage is connected with a high potential and is pulled up by the high potential, and the common voltage is compensated and kept at a stable potential.
The preset gray scale threshold is greater than 100.
The invention has the beneficial effects that: the invention provides a public voltage regulating circuit, comprising: the voltage regulation system comprises a voltage generation module, a voltage output module electrically connected with the voltage generation module, a voltage regulation module electrically connected with the voltage output module and the voltage generation module, and a time schedule controller electrically connected with the voltage regulation module; the time schedule controller judges whether the public voltage needs to be compensated or not by monitoring the gray scale change of a picture to be displayed of the display panel and according to the gray scale change of the picture to be displayed, and outputs a control signal to the voltage regulating module when the public voltage needs to be compensated so as to control the voltage regulating module to regulate the reference voltage and compensate the public voltage, thereby realizing the real-time compensation without delay on the public voltage, effectively eliminating the horizontal crosstalk and improving the display quality. The invention also provides a public voltage adjusting method, which can realize the real-time compensation without delay on the public voltage, eliminate the horizontal crosstalk and improve the display quality.
Drawings
For a better understanding of the nature and technical aspects of the present invention, reference should be made to the following detailed description of the invention, taken in conjunction with the accompanying drawings, which are provided for purposes of illustration and description and are not intended to limit the invention.
In the drawings, there is shown in the drawings,
FIG. 1 is a schematic diagram of a prior art common voltage regulation circuit;
FIG. 2 is a waveform diagram of a conventional common voltage regulator circuit;
FIG. 3 is a schematic diagram of a common voltage regulation circuit of the present invention;
FIG. 4 is a circuit diagram of a preferred embodiment of the common voltage regulation circuit of the present invention;
FIG. 5 is a diagram of a picture to be displayed in a preferred embodiment of the common voltage regulating circuit of the present invention;
FIG. 6 is a waveform diagram of the common voltage regulating circuit of the present invention corresponding to the position A in FIG. 5;
FIG. 7 is a waveform diagram of the common voltage regulating circuit of the present invention corresponding to the position B in FIG. 5;
FIG. 8 is a flow chart of a common voltage regulation method of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
The invention provides a public voltage regulating circuit which is applied to a liquid crystal display panel to eliminate horizontal crosstalk caused by ripples of public voltage and improve display quality.
Referring to fig. 3, the common voltage regulating circuit includes: the voltage regulation circuit comprises a voltage generation module 1, a voltage output module 2 electrically connected with the voltage generation module 1, a voltage regulation module 3 electrically connected with the voltage output module 2 and the voltage generation module 1, and a time schedule controller 4 electrically connected with the voltage regulation module 3.
The voltage generation module 1 is configured to receive a power supply voltage VAA and generate a reference voltage Vcom _ Ref by using the power supply voltage VAA;
the voltage output module 2 is configured to receive a reference voltage Vcom _ Ref, generate a common voltage Vcom according to the reference voltage Vcom _ Ref, and input the common voltage Vcom to the display panel 100;
the timing controller 4 is configured to monitor gray scale changes of a to-be-displayed picture of the display panel 100, determine whether the common voltage Vcom needs to be compensated according to the gray scale changes of the to-be-displayed picture, and output a control signal to the voltage adjustment module 3 when the common voltage Vcom needs to be compensated;
the voltage adjusting module 3 is configured to adjust the reference voltage Vcom _ Ref under the control of the control signal to compensate the common voltage Vcom.
Specifically, the timing controller 4 determines that the common voltage Vcom needs to be compensated when the gray scale variation of two adjacent rows of sub-pixels in the to-be-displayed picture exceeds a preset gray scale threshold.
Preferably, the preset grayscale threshold is greater than 100.
It should be noted that the fact that the gray scale change of two adjacent rows of sub-pixels in the to-be-displayed picture exceeds the preset gray scale threshold specifically means that the gray scale change of a plurality of continuous sub-pixels in the two adjacent rows of sub-pixels in the to-be-displayed picture exceeds the preset gray scale threshold, that is, the change of the gray scale corresponding to the data voltage on the plurality of data lines connected and arranged exceeds the preset gray scale threshold within the charging time of the two adjacent rows of sub-pixels in the to-be-displayed picture, and preferably, the actual number of the plurality of continuous sub-pixels is greater than one fifth of the number of the sub-pixels in one row.
Specifically, the timing controller 4 outputs different control signals to the voltage adjusting module 3 according to different gray scale change directions of two adjacent rows of sub-pixels.
Specifically, when it is determined that the common voltage Vcom needs to be compensated and the gray scale change of the sub-pixels in two adjacent rows in the to-be-displayed picture changes from high to low, the first control signal GPO _ L is output to the voltage adjusting module 3;
when it is determined that the common voltage Vcom needs to be compensated and the gray scale change of two adjacent rows of sub-pixels in the to-be-displayed picture changes from low to high, the timing controller 4 outputs a second control signal GPO _ H to the voltage adjusting module 3.
Specifically, the voltage regulation module 3 receives a low voltage V1 under the control of a first control signal GPO _ L to pull down the reference voltage Vcom _ Ref through the low voltage V1;
the voltage regulating module 3 receives a high voltage V2 under the control of a second control signal GPO _ H to pull up the reference voltage Vcom _ Ref through the high voltage V2.
Specifically, as shown in fig. 4, in a preferred embodiment of the present invention, the voltage generating module 1 includes: a digital adjustable resistor DVR and a first resistor R1;
the voltage output module 2 includes: a capacitor C1 and at least one operational amplifier OP;
the voltage regulation module 3 comprises a first triode M1, a second triode M2, a second resistor R2 and a third resistor R3;
the first end of the digital adjustable resistor DVR receives a power supply voltage VAA, and the second end of the digital adjustable resistor DVR is electrically connected with the first end of the first resistor R1;
a second end of the first resistor R1 outputs a reference voltage Vcom _ Ref;
the first end of the capacitor C1 is electrically connected with the second end of the first resistor R1, and the second end is grounded;
the non-inverting input terminal of each operational amplifier OP is electrically connected to the second terminal of the first resistor R1, the inverting input terminal is electrically connected to the output terminal, and the output terminal outputs the common voltage Vcom to the display panel;
a base electrode of the first triode M1 is electrically connected to a first output end of the timing controller 4 for outputting a first control signal GPO _ L, an emitter electrode is electrically connected to a first end of the second resistor R2, and a collector electrode is electrically connected to a second end of the first resistor R1;
the second end of the second resistor R2 is connected with a low voltage V1;
a base electrode of the second triode M2 is electrically connected to a second output end of the timing controller 4 for outputting a second control signal GPO _ H, an emitter electrode is electrically connected to a first end of the third resistor R3, and a collector electrode is electrically connected to a second end of the first resistor R1;
the second end of the third resistor R3 is connected to a high voltage V2.
Preferably, the low potential V1 is a ground potential.
Specifically, when the first control signal GPO _ L outputs a high pulse, the first transistor M1 is turned on, and when the second control signal GPO _ H and the second transistor M2 outputs a low pulse, the second transistor M2 is turned on.
Preferably, the number of the operational amplifiers OP is 2, although the invention is not limited thereto, and the numerical control of the operational amplifiers OP may be other numbers, such as 1 or 3, if necessary.
It should be noted that, as shown in fig. 5 and fig. 6, at the position a of fig. 5, when the image to be displayed jumps from black to white, that is, when the gray scale of two adjacent rows of sub-pixels changes from low to high, if the compensation is not performed on the common voltage Vcom, the common voltage will have low-potential ripples, so in order to eliminate the low-potential ripples and keep the stability of the common voltage, the second triode M2 is turned on by the second control signal GPO _ H, so that the high-potential V2 is connected, the reference voltage Vcom _ Ref is pulled up by the high voltage V2, so that the common voltage Vcom generated by the reference voltage Vcom _ Ref is also pulled up, and after the low-potential ripples caused by the gray scale change are matched, the waveform of the real-time output common voltage Vcom will remain stable and unchanged, so that the output of the common voltage Vcom is not affected by the gray scale change;
as shown in fig. 5 and 7, at the position B of fig. 5, the to-be-displayed picture jumps from white to black, that is, the gray scale of two adjacent rows of sub-pixels in the to-be-displayed picture changes from high to low, and if the common voltage Vcom is not compensated, the common voltage will have a ripple with a high potential, so that in order to eliminate the ripple with the high potential and keep the common voltage stable, the first triode M1 is turned on by the first control signal GPO _ L, so as to switch in the low potential V1, and the reference voltage Vcom _ Ref is pulled down by the low voltage V1, so that the common voltage Vcom generated by the reference voltage Vcom _ Ref is also pulled down, and after the ripple with the high potential caused by the gray scale change is matched, the waveform of the real-time output common voltage Vcom will keep stable, so that the output of the common voltage Vcom is not affected by the gray scale change.
As can be seen from fig. 5 to 7, the adjustment of the common voltage adjusting circuit according to the present invention can keep the common voltage Vcom input to the display panel 100 stable all the time, so as to effectively eliminate the horizontal crosstalk, and the compensation of the common voltage Vcom is not delayed, and can effectively function in the high-resolution display panel.
Referring to fig. 8, the present invention further provides a method for adjusting a common voltage, including the following steps:
step S1, receiving the power supply voltage VAA, and generating a reference voltage Vcom _ Ref using the power supply voltage VAA;
step S2, generating a common voltage Vcom according to the reference voltage Vcom _ Ref, and inputting the common voltage Vcom to the display panel;
step S3, monitoring the gray scale change of the picture to be displayed of the display panel, and judging whether the common voltage Vcom needs to be compensated according to the gray scale change of the picture to be displayed;
step S4, generating a control signal when the common voltage Vcom needs to be compensated, and adjusting the reference voltage Vcom _ Ref under the control of the control signal to compensate the common voltage Vcom.
Specifically, in step S4, when the gray scale variation of two adjacent rows of sub-pixels in the to-be-displayed image exceeds a preset gray scale threshold, it is determined that the common voltage Vcom needs to be compensated.
Preferably, the preset grayscale threshold is greater than 100.
It should be noted that the fact that the gray scale change of two adjacent rows of sub-pixels in the to-be-displayed picture exceeds the preset gray scale threshold specifically means that the gray scale change of a plurality of continuous sub-pixels in the two adjacent rows of sub-pixels in the to-be-displayed picture exceeds the preset gray scale threshold, that is, the change of the gray scale corresponding to the data voltage on the plurality of data lines connected and arranged exceeds the preset gray scale threshold within the charging time of the two adjacent rows of sub-pixels in the to-be-displayed picture, and preferably, the actual number of the plurality of continuous sub-pixels is greater than one fifth of the number of the sub-pixels in one row.
Specifically, when the common voltage Vcom needs to be compensated and the gray scale change of the sub-pixels in two adjacent rows in the image to be displayed changes from high to low, a first control signal GPO _ L is generated, under the control of the first control signal, the reference voltage Vcom _ Ref is connected to a low potential V1 and is pulled down by the low potential V1, and the common voltage Vcom is compensated and maintained at a stable potential;
when the common voltage Vcom needs to be compensated and the gray scale of the sub-pixels in two adjacent rows in the picture to be displayed changes from low to high, a second control signal GPO _ H is generated, under the control of the second control signal, the reference voltage Vcom _ Ref is connected with a high potential V2 and is pulled high by the high potential V2, and the common voltage Vcom is compensated and kept at a stable potential.
It should be noted that, as shown in fig. 5 and fig. 6, at the position a of fig. 5, when the image to be displayed jumps from black to white, that is, when the gray scale of two adjacent rows of sub-pixels changes from high to low, if the common voltage Vcom is not compensated, the common voltage will have a ripple with a low potential, so that to eliminate the ripple with the low potential and keep the stability of the common voltage, the present invention pulls up the reference voltage Vcom _ Ref through the high voltage V2, so that the common voltage Vcom generated by the reference voltage Vcom _ Ref is also pulled up, and after the ripple with the low potential caused by the gray scale change is matched, the waveform of the real-time output common voltage Vcom will keep stable and unchanged, so that the output of the common voltage Vcom is not affected by the gray scale change;
as shown in fig. 5 and 7, at the position B of fig. 5, the to-be-displayed picture jumps from white to black, that is, the gray scale of two adjacent rows of sub-pixels in the to-be-displayed picture changes from high to low, and if the common voltage Vcom is not compensated, the common voltage will have a ripple with a high potential, so that in order to eliminate the ripple with the high potential and keep the stability of the common voltage, the reference voltage Vcom _ Ref is pulled down by the low voltage V1 in the present invention, so that the common voltage Vcom generated by the reference voltage Vcom _ Ref is also pulled down, and after matching the ripple with the high potential caused by the gray scale change, the waveform of the real-time output common voltage Vcom will keep stable, so that the output of the common voltage Vcom is not affected by the gray scale change.
As can be seen from fig. 5 to 7, the adjustment of the common voltage adjusting circuit according to the present invention can keep the common voltage Vcom input to the display panel 100 stable all the time, so as to effectively eliminate the horizontal crosstalk, and the compensation of the common voltage Vcom is not delayed, and can effectively function in the high-resolution display panel.
In summary, the present invention provides a common voltage regulating circuit, including: the voltage regulation system comprises a voltage generation module, a voltage output module electrically connected with the voltage generation module, a voltage regulation module electrically connected with the voltage output module and the voltage generation module, and a time schedule controller electrically connected with the voltage regulation module; the time schedule controller judges whether the public voltage needs to be compensated or not by monitoring the gray scale change of a picture to be displayed of the display panel and according to the gray scale change of the picture to be displayed, and outputs a control signal to the voltage regulating module when the public voltage needs to be compensated so as to control the voltage regulating module to regulate the reference voltage and compensate the public voltage, thereby realizing the real-time compensation without delay on the public voltage, effectively eliminating the horizontal crosstalk and improving the display quality. The invention also provides a public voltage adjusting method, which can realize the real-time compensation without delay on the public voltage, eliminate the horizontal crosstalk and improve the display quality.
As described above, it will be apparent to those skilled in the art that other various changes and modifications may be made based on the technical solution and concept of the present invention, and all such changes and modifications are intended to fall within the scope of the appended claims.
Claims (7)
1. A common voltage regulation circuit, comprising: the device comprises a voltage generation module (1), a voltage output module (2) electrically connected with the voltage generation module (1), a voltage regulation module (3) electrically connected with the voltage output module (2) and the voltage generation module (1), and a time schedule controller (4) electrically connected with the voltage regulation module (3);
the voltage generation module (1) is used for receiving a power supply Voltage (VAA) and generating a reference voltage (Vcom _ Ref) by using the power supply Voltage (VAA);
the voltage output module (2) is used for receiving a reference voltage (Vcom _ Ref), generating a common voltage (Vcom) according to the reference voltage (Vcom _ Ref), and inputting the common voltage (Vcom) into the display panel (100);
the time schedule controller (4) is used for monitoring gray scale change of a picture to be displayed of the display panel (100), judging whether the common voltage (Vcom) needs to be compensated according to the gray scale change of the picture to be displayed, and outputting a control signal to the voltage regulating module (3) when the common voltage (Vcom) needs to be compensated;
the voltage adjusting module (3) is used for adjusting the reference voltage (Vcom _ Ref) under the control of the control signal so as to compensate the common voltage (Vcom);
the voltage generation module (1) comprises: a digitally tunable resistor (DVR) and a first resistance (R1); the first end of the digital adjustable resistor (DVR) receives a power supply Voltage (VAA), and the second end of the digital adjustable resistor (DVR) is electrically connected with the first end of the first resistor (R1); a second terminal of the first resistor (R1) outputs a reference voltage (Vcom _ Ref);
the voltage output module (2) comprises: a capacitor (C1) and at least one operational amplifier (OP); the first end of the capacitor (C1) is electrically connected with the second end of the first resistor (R1), and the second end is grounded; the non-inverting input end of each operational amplifier (OP) is electrically connected with the second end of the first resistor (R1), the inverting input end of each operational amplifier (OP) is electrically connected with the output end of each operational amplifier, and the output ends of each operational amplifier (OP) output a common voltage (Vcom) to the display panel;
the voltage regulation module (3) comprises a first triode (M1), a second triode (M2), a second resistor (R2) and a third resistor (R3);
the base of the first triode (M1) is electrically connected with a first output end of the time schedule controller (4) and used for outputting a first control signal (GPO _ L), the emitter is electrically connected with a first end of a second resistor (R2), the collector is electrically connected with a second end of a first resistor (R1), a second end of the second resistor (R2) is connected with a low voltage (V1), the base of the second triode (M2) is electrically connected with a second output end of the time schedule controller (4) and used for outputting a second control signal (GPO _ H), the emitter is electrically connected with a first end of a third resistor (R3), the collector is electrically connected with a second end of the first resistor (R1), and a second end of the third resistor (R3) is connected with a high voltage (V2).
2. The common voltage regulating circuit according to claim 1, wherein the timing controller (4) determines that the common voltage (Vcom) needs to be compensated when the gray scale variation of two adjacent rows of sub-pixels in the picture to be displayed exceeds a preset gray scale threshold.
3. The common voltage regulating circuit according to claim 2, wherein the timing controller (4) outputs a first control signal (GPO _ L) to the voltage regulating module (3) when it is determined that the common voltage (Vcom) needs to be compensated and the gray scale change of the sub-pixels of two adjacent rows in the picture to be displayed changes from high to low;
and the time sequence controller (4) outputs a second control signal (GPO _ H) to the voltage regulation module (3) when the common voltage (Vcom) is determined to need compensation and the gray scale change of two adjacent rows of sub-pixels in the picture to be displayed is changed from low to high.
4. A common voltage regulation circuit according to claim 3, characterized in that the voltage regulation module (3) receives a low voltage (V1) under control of a first control signal (GPO _ L) to pull down the reference voltage (Vcom Ref) by the low voltage (V1);
the voltage regulation module (3) receives a high voltage (V2) under control of a second control signal (GPO _ H) to pull up the reference voltage (Vcom _ Ref) by the high voltage (V2).
5. The common voltage regulating circuit according to claim 2, wherein said predetermined gray scale threshold is greater than 100.
6. A public voltage regulation method is characterized by comprising the following steps:
step S1, receiving the power supply Voltage (VAA), and generating a reference voltage (Vcom _ Ref) using the power supply Voltage (VAA);
step S2, generating a common voltage (Vcom) according to the reference voltage (Vcom _ Ref), and inputting the common voltage (Vcom) to the display panel;
step S3, monitoring the gray scale change of the picture to be displayed of the display panel, and judging whether the common voltage (Vcom) needs to be compensated according to the gray scale change of the picture to be displayed;
step S4, generating a control signal when the common voltage (Vcom) needs to be compensated, and adjusting the reference voltage (Vcom _ Ref) under the control of the control signal to compensate the common voltage (Vcom);
in the step S4, when the gray scale variation of two adjacent rows of sub-pixels in the to-be-displayed picture exceeds a preset gray scale threshold, it is determined that the common voltage (Vcom) needs to be compensated;
in the step S4, in the above step,
when the common voltage (Vcom) needs to be compensated and the gray scale change of the sub-pixels in two adjacent rows in the picture to be displayed changes from high to low, a first control signal (GPO _ L) is generated, under the control of the first control signal, the reference voltage (Vcom _ Ref) is connected with a low potential (V1) and is pulled down by the low potential (V1), and the common voltage (Vcom) is compensated and kept at a stable potential;
when the common voltage (Vcom) needs to be compensated and the gray scale change of the sub-pixels in two adjacent rows in the picture to be displayed changes from low to high, a second control signal (GPO _ H) is generated, under the control of the second control signal, the reference voltage (Vcom _ Ref) is connected with a high potential (V2) and is pulled high by the high potential (V2), and the common voltage (Vcom) is compensated and kept at a stable potential.
7. The method according to claim 6, wherein the predetermined gray level threshold is greater than 100.
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| CN110060618A (en) * | 2019-04-02 | 2019-07-26 | 北海惠科光电技术有限公司 | The voltage adjusting method and display device of display panel |
| CN110428788A (en) * | 2019-07-24 | 2019-11-08 | 深圳市华星光电技术有限公司 | A kind of the common voltage compensation circuit and compensation system of display panel |
| CN110930922B (en) * | 2019-11-25 | 2021-09-03 | Tcl华星光电技术有限公司 | Method for improving horizontal crosstalk of display panel |
| CN111477194B (en) * | 2020-05-27 | 2022-02-22 | 京东方科技集团股份有限公司 | Common voltage output circuit, display device and common voltage compensation method |
| CN111833826B (en) * | 2020-07-23 | 2021-11-23 | 昆山龙腾光电股份有限公司 | Common voltage compensation circuit and display device thereof |
| CN116508093A (en) * | 2021-11-26 | 2023-07-28 | 京东方科技集团股份有限公司 | Driving circuit of display panel, driving method of driving circuit and display device |
| CN114639360B (en) * | 2022-03-01 | 2023-04-07 | 深圳市华星光电半导体显示技术有限公司 | Display panel and display device |
| CN115223515B (en) * | 2022-07-22 | 2023-11-28 | 深圳市华星光电半导体显示技术有限公司 | Display device and control method thereof |
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