CN111477194A - Common voltage output circuit, display device and common voltage compensation method - Google Patents
Common voltage output circuit, display device and common voltage compensation method Download PDFInfo
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- CN111477194A CN111477194A CN202010462758.2A CN202010462758A CN111477194A CN 111477194 A CN111477194 A CN 111477194A CN 202010462758 A CN202010462758 A CN 202010462758A CN 111477194 A CN111477194 A CN 111477194A
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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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Abstract
The utility model provides a public voltage output circuit, wherein, a compensation voltage output module is connected with an input voltage end, a reference voltage end and a first end of a first capacitor, an initial public voltage end is connected with a first end of a buffer resistor, a second end of the buffer resistor is connected with a second end of the first capacitor, and the second end of the first capacitor is also connected with a voltage output end; the compensation voltage output module is configured to enable a reference voltage provided by the reference voltage end to be written into the first end of the first capacitor in a non-compensation stage; and in the compensation stage, generating a currently required compensation voltage based on the input voltage provided by the input voltage end, writing the compensation voltage into the first end of the first capacitor so as to compensate the initial common voltage output by the initial common voltage end, and outputting the initial common voltage through the voltage output end. The disclosure also provides a display device and a common voltage compensation method.
Description
Technical Field
The embodiment of the disclosure relates to the technical field of display, and in particular relates to a common voltage output circuit, a display device and a common voltage compensation method.
Background
The thin film transistor liquid crystal display (TFT-L CD) based on the ADS display mode has good display characteristics including good viewing angle characteristics, color gamut and the like, so that the thin film transistor liquid crystal display has wide market prospect.
However, a large-sized TFT-L CD screen usually has a poor Crosstalk in some frame display pictures (Pattern), which is because parasitic capacitance exists between the pixel electrode and the common electrode, when the gray scale corresponding to some adjacent row and column pixels jumps in the same direction, it is easy to cause the coupling of common Voltage (VCOM) and instantaneous jump (Ripple), so as to cause the horizontal Crosstalk (Crosstalk) of the row pixels with gray scale jump, and the horizontal Crosstalk makes the VCOM deviate from the initial value, specifically, it is shown that the horizontal bright/dark line exists in the row pixels with gray scale jump, which affects the display characteristics.
Disclosure of Invention
The disclosed embodiments are directed to at least one of the technical problems in the prior art, and provide a common voltage output circuit, a display device and a common voltage compensation method.
In a first aspect, an embodiment of the present disclosure provides a common voltage output circuit, including: the compensation voltage output module, the first capacitor, the initial common voltage end, the buffer resistor and the voltage output end; the compensation voltage output module is connected with an input voltage end, a reference voltage end and a first end of the first capacitor, the initial common voltage end is connected with a first end of the buffer resistor, a second end of the buffer resistor is connected with a second end of the first capacitor, and the second end of the first capacitor is also connected with the voltage output end;
the compensation voltage output module is configured to enable a reference voltage provided by the reference voltage end to be written into the first end of the first capacitor in a non-compensation stage; in the compensation stage, generating a currently required compensation voltage based on an input voltage provided by the input voltage end, writing the compensation voltage into the first end of the first capacitor so as to compensate the initial common voltage output by the initial common voltage end, and outputting the initial common voltage through the voltage output end;
the initial common voltage terminal is configured to write the initial common voltage to the second terminal of the first capacitor in the non-compensation phase to output the initial common voltage through the voltage output terminal.
In some embodiments, the compensation voltage output module comprises: the voltage divider comprises a plurality of switch circuits, switch control ends corresponding to the switch circuits and voltage dividing resistors which are arranged in one-to-one correspondence with the switch circuits;
the input ends of the switch circuits are connected with the input voltage end, and the corresponding divider resistors of the switch circuits are connected in series; the output end of each switch circuit is connected with the first end of the corresponding divider resistor; except the divider resistor positioned at the last position, the second end of each divider resistor is connected with the first end of the adjacent divider resistor, and the second end of the divider resistor positioned at the last position is connected with the reference voltage end; the first end of the first capacitor is connected to the first end of the divider resistor at the last position;
the control end of each switch circuit is connected with the corresponding switch control end, and the switch circuit is configured to be switched on or switched off in response to the control of the corresponding switch control end.
In some embodiments, the plurality of switch circuits includes a first switch circuit, a second switch circuit, a third switch circuit, and a fourth switch circuit, and the voltage dividing resistor corresponding to each switch circuit is sequentially a first voltage dividing resistor, a second voltage dividing resistor, a third voltage dividing resistor, and a fourth voltage dividing resistor;
the first switch circuit comprises a first switch transistor and a second switch transistor, wherein a first pole of the first switch transistor is connected with the input voltage end, a second pole of the first switch transistor is connected with a first pole of the second switch transistor, and a control pole of the first switch transistor is connected with a first switch control end; a second pole of the second switching transistor is connected with a first end of the first voltage-dividing resistor, a control pole of the second switching transistor is connected with a second switching control end, and a second end of the first voltage-dividing resistor is connected with a first end of the second voltage-dividing resistor;
the second switch circuit comprises a third switch transistor and a fourth switch transistor, wherein the first pole of the third switch transistor is connected with the input voltage end, the second pole of the third switch transistor is connected with the first pole of the fourth switch transistor, and the control pole of the third switch transistor is connected with the control end of the third switch transistor; a second pole of the fourth switching transistor is connected with a first end of the second voltage-dividing resistor, a control pole of the fourth switching transistor is connected with a fourth switch control end, and a second end of the second voltage-dividing resistor is connected with a first end of the third voltage-dividing resistor;
the third switch circuit comprises a fifth switch transistor and a sixth switch transistor, wherein the first pole of the fifth switch transistor is connected with the input voltage end, the second pole of the fifth switch transistor is connected with the first pole of the sixth switch transistor, and the control pole of the fifth switch transistor is connected with the first switch control end; a second pole of the sixth switching transistor is connected to the first terminal of the third voltage dividing resistor, a control pole of the sixth switching transistor is connected to the control terminal of the fourth switch, and a second terminal of the third voltage dividing resistor is connected to the first terminal of the fourth voltage dividing resistor;
the fourth switching circuit comprises a seventh switching transistor and an eighth switching transistor, wherein the first pole of the seventh switching transistor is connected with the input voltage end, the second pole of the seventh switching transistor is connected with the first pole of the eighth switching transistor, and the control pole of the seventh switching transistor is connected with the control end of the third switch; a second pole of the eighth switching transistor is connected to a first end of the fourth voltage-dividing resistor, a control pole of the eighth switching transistor is connected to the control end of the second switch, and a second end of the fourth voltage-dividing resistor is connected to the reference voltage end;
the first end of the first capacitor is connected to the first end of the fourth voltage-dividing resistor.
In some embodiments, the common voltage output circuit further comprises a compensation control module, the compensation control module is connected with the input voltage terminal;
the compensation control module is configured to provide the input voltage to the input voltage terminal during the compensation phase; and in the compensation stage, providing a conducting signal to a switch control end corresponding to one of the switch circuits to enable the switch circuit corresponding to the switch control end to be conducted, and providing a closing signal to switch control ends corresponding to the other switch circuits to enable the other switch circuits to be closed.
In some embodiments, the common voltage output circuit is for a display panel comprising a plurality of pixels arranged in an array, the compensation control module being specifically configured to:
in the scanning stage of the pixels of the current row, counting the gray scale change value of each row of pixels of the next row of pixels relative to the row of pixels of the current row of pixels; determining whether the common voltage corresponding to the next row of pixels needs to be compensated or not according to the gray scale change value corresponding to each row of pixels of the next row of pixels, and determining the current corresponding compensation grade;
after determining that the common voltage corresponding to the next row of pixels needs to be compensated and the current corresponding compensation level, providing the input voltage to the input voltage end in the scanning stage of the next row of pixels and in the compensation stage; and determining the switch circuit needing to be conducted according to the current corresponding compensation grade so as to provide a conducting signal for the switch control end corresponding to the switch circuit and provide a closing signal for the switch control ends corresponding to the other switch circuits.
In some embodiments, the display panel can display L gray scales, N compensation levels are preset, N is more than or equal to 2, each compensation level is correspondingly provided with a switch circuit, and for each row of pixels of the next row of pixels, the gray scale change value corresponding to the row of pixels of the next row of pixels is the difference value between the gray scale corresponding to the row of pixels of the next row of pixels and the gray scale corresponding to the row of pixels of the current row of pixels;
the determining whether the common voltage corresponding to the next row of pixels needs to be compensated according to the change value of the gray scale corresponding to each row of pixels of the next row of pixels and determining the current corresponding compensation level includes:
aiming at gray scale change values corresponding to all rows of pixels in the next row of pixels, when the ratio of the number of gray scale change values which are greater than or equal to N × L/(N +1) in the gray scale change values which change in the same direction to the total number of rows of pixels in the next row is greater than or equal to a preset ratio, determining that the common voltage corresponding to the pixels in the next row needs to be compensated and the current corresponding compensation grade is the Nth grade;
when the ratio of the number of gray scale change values in the same-direction change to the total number of columns of the next row of pixels is greater than or equal to i L/(N +1), and the ratio of the number of gray scale change values in the same-direction change to the total number of columns of the next row of pixels is greater than or equal to a preset ratio, and the ratio of the number of gray scale change values in the same-direction change to the total number of columns of the next row of pixels is less than (i +1) × L/(N +1), determining that the common voltage corresponding to the next row of pixels needs to be compensated, the current corresponding compensation grade is the ith grade, and i is greater than or equal to 1 and less than or equal to (N-1);
when the ratio of the number of the gray scale change values with the absolute value smaller than 1 × L/(N +1) to the total column number of the next row of pixels in the gray scale change values with the same direction change is larger than (1-preset ratio), determining that the common voltage corresponding to the next row of pixels does not need to be compensated;
wherein, the same direction change means that the same positive value or the same negative value is used.
In some embodiments, a diode is further disposed between the input voltage terminal and the compensation voltage output module, a first terminal of the diode is connected to the input voltage terminal, and a second terminal of the diode is connected to the compensation voltage output module.
In some embodiments, an operational amplifier is further disposed between the second end of the first capacitor and the voltage output end;
the first input end of the operational amplifier is connected with the second end of the first capacitor, the second input end of the operational amplifier is connected with the output end of the operational amplifier, and the output end of the operational amplifier is connected with the voltage output end.
In some embodiments, the common voltage output circuit further comprises a second capacitor, a first terminal of the second capacitor is connected to the output terminal of the operational amplifier, and a second terminal of the second capacitor is connected to the reference voltage terminal.
In a second aspect, embodiments of the present disclosure provide a display device including a display panel and the common voltage output circuit provided in any one of the above embodiments.
In a third aspect, an embodiment of the present disclosure provides a common voltage compensation method, which is based on the common voltage output circuit provided in any of the foregoing embodiments, and the method includes:
in a non-compensation stage, the compensation voltage output module enables a reference voltage provided by the reference voltage end to be written into a first end of the first capacitor, and the initial common voltage end writes the initial common voltage into a second end of the first capacitor so as to output the initial common voltage through the voltage output end;
in the compensation stage, the compensation voltage output module generates a currently required compensation voltage based on an input voltage provided by the input voltage terminal, and writes the compensation voltage into the first terminal of the first capacitor, so as to compensate an initial common voltage output by the initial common voltage terminal, and output the initial common voltage through the voltage output terminal.
In some embodiments, the common voltage output circuit includes the above common voltage output circuit including a plurality of switch circuits and a compensation control module, and the common voltage output circuit is used for a display panel including a plurality of pixels arranged in an array;
before the compensation stage, the compensation voltage output module generates a currently required compensation voltage based on the input voltage provided by the input voltage terminal, the method further includes:
in the scanning stage of the pixels of the current row, the compensation control module counts the gray scale change value of each row of pixels of the next row relative to the row of pixels of the current row; determining whether the common voltage corresponding to the next row of pixels needs to be compensated or not according to the gray scale change value corresponding to each row of pixels of the next row of pixels, and determining the current corresponding compensation grade;
after determining that the common voltage corresponding to the next row of pixels needs to be compensated and the current corresponding compensation grade, the compensation control module provides the input voltage to the input voltage end in the scanning stage of the next row of pixels and in the compensation stage, and determines the switch circuit needing to be switched on according to the current corresponding compensation grade so as to provide a switching-on signal to the switch control end corresponding to the switch circuit and provide a switching-off signal to the switch control ends corresponding to the other switch circuits.
Drawings
Fig. 1 is a schematic structural diagram of a common voltage output circuit according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a compensation voltage output module shown in FIG. 1;
FIG. 3 is a schematic diagram of an embodiment of the compensation voltage output module shown in FIG. 2;
fig. 4 is a schematic structural diagram of another common voltage output circuit provided in the embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of another common voltage output circuit provided in the embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a common voltage jump caused by a gray scale jump;
fig. 7 is a flowchart of a common voltage compensation method provided by an embodiment of the present disclosure;
fig. 8 is a flowchart of another common voltage compensation method provided in the embodiments of the present disclosure.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the embodiments of the present disclosure, the technical solutions of the common voltage output circuit, the display device and the common voltage compensation method provided by the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings of the embodiments of the present disclosure.
The accompanying drawings, which are included to provide a further understanding of the embodiments of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the principles of the disclosure and not to limit the disclosure.
Example embodiments will be described more fully hereinafter with reference to the accompanying drawings, but which may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements/structures, these elements/structures should not be limited by these terms. These terms are only used to distinguish one element/structure from another element/structure.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As shown in fig. 1, an embodiment of the present disclosure provides a common voltage output circuit, including: the compensation voltage OUTPUT module 10, the first capacitor C1, an initial common voltage terminal U0 for providing an initial common voltage Vcom0, a buffer resistor R0, and a voltage OUTPUT terminal OUTPUT, wherein the compensation voltage OUTPUT module 10 is connected to the INPUT voltage terminal INPUT, the reference voltage terminal Ref, and a first terminal of the first capacitor C1, the initial common voltage terminal U0 is connected to a first terminal of the buffer resistor R0, a second terminal of the buffer resistor R0 is connected to a second terminal of the first capacitor C1, and a second terminal of the first capacitor C1 is further connected to the voltage OUTPUT terminal OUTPUT.
Wherein, the compensated voltage output module 10 is configured to, during the non-compensation phase, cause the reference voltage Vref provided by the reference voltage terminal Ref to be written into the first terminal of the first capacitor C1; and in the compensation phase, generating a currently required compensation voltage Vj based on the INPUT voltage Vin provided by the INPUT voltage terminal INPUT, and writing the compensation voltage Vj to the first terminal of the first capacitor C1 to compensate the initial common voltage Vcom0 OUTPUT by the initial common voltage terminal U0, and outputting the compensation voltage via the voltage OUTPUT terminal OUTPUT.
The initial common voltage terminal U0 is configured to write an initial common voltage Vcom0 to the second terminal of the first capacitor C1 in an uncompensated stage to OUTPUT the initial common voltage Vcom0 through the voltage OUTPUT terminal OUTPUT. Here, the initial common voltage Vcom0 is an initial predetermined reference common voltage.
In the embodiment of the disclosure, the common voltage OUTPUT circuit is applied to a display panel, the display panel includes a plurality of pixels arranged in an array, in a scanning display process, when gray scales corresponding to a plurality of rows of pixels in adjacent rows have large jumps in the same direction, a compensation voltage OUTPUT module 10 generates a currently required compensation voltage, and compensates an initial common voltage Vcom0 provided by an initial common voltage end U0 through a first capacitor C1, and finally OUTPUTs the compensated common voltage to a common electrode of the display panel through a voltage OUTPUT end OUTPUT, so as to compensate transient jumps (Ripple) of the common voltage due to gray scale jumps caused by coupling, thereby effectively improving a bad lateral crosstalk phenomenon of the row pixels having gray scale jumps, and effectively improving a display effect of the display panel.
In the embodiment of the present disclosure, the compensation voltage output module 10 includes: the voltage divider comprises a plurality of switch circuits, switch control ends corresponding to the switch circuits and voltage dividing resistors arranged in one-to-one correspondence with the switch circuits.
The INPUT ends of the switch circuits are connected with an INPUT voltage end INPUT, and the corresponding divider resistors of the switch circuits are connected in series; the output end of each switch circuit is connected with the first end of the corresponding divider resistor; in the series direction, except for the voltage-dividing resistor located at the last position, the second end of each voltage-dividing resistor is connected with the first end of the adjacent voltage-dividing resistor, and the second end of the voltage-dividing resistor located at the last position is connected to the reference voltage terminal Ref; a first terminal of the first capacitor C1 is connected to a first terminal of the voltage dividing resistor at the last bit.
The control end of each switch circuit is connected with the corresponding switch control end, and the switch circuit is configured to be switched on or switched off in response to the control of the corresponding switch control end, so that the input end and the output end of the switch circuit are communicated when the switch circuit is switched on. In the compensation stage, one switch circuit is controlled to be switched on by one switch control end, and the other switch circuits are controlled to be switched off by the other switch control ends. According to the principle of resistance voltage division, it can be understood that when different switch circuits are turned on, different compensation voltages are written into the first end of the first capacitor, that is, each switch circuit corresponds to one compensation voltage.
As shown in fig. 2, in some embodiments, the plurality of switch circuits includes a first switch circuit 101, a second switch circuit 102, a third switch circuit 103, and a fourth switch circuit 104, voltage dividing resistors corresponding to each switch circuit are a first voltage dividing resistor R1, a second voltage dividing resistor R2, a third voltage dividing resistor R3, and a fourth voltage dividing resistor R4, and switch control terminals corresponding to each switch circuit are a switch control terminal D01, a switch control terminal D0 '1', a switch control terminal D01 ', and a switch control terminal D0' 1, respectively. It should be noted that fig. 2 only illustrates a case where the plurality of switch circuits includes four switch circuits, and the embodiment of the present disclosure includes but is not limited to this, and the embodiment of the present disclosure may also include a case where 2 switch circuits, 3 switch circuits, or more switch circuits.
In some embodiments, each of the first switch circuit 101, the second switch circuit 102, the third switch circuit 103, and the fourth switch circuit 104 includes a switch transistor, wherein a first pole of the switch transistor is connected to the INPUT voltage terminal INPUT, a second pole of the switch transistor is connected to a first end of the corresponding voltage dividing resistor, and a control pole of the switch transistor is connected to a corresponding switch control terminal. Note that this case is not shown in the drawings.
As shown in fig. 3, in some embodiments, the first switching circuit 101 includes a first switching transistor T1, a second switching transistor T2, a first pole of the first switching transistor T1 is connected to the INPUT voltage terminal INPUT, a second pole of the first switching transistor T1 is connected to a first pole of the second switching transistor T2, and a control pole of the first switching transistor T1 is connected to the first switch control terminal D0; a second pole of the second switching transistor T2 is connected to a first terminal of a first voltage-dividing resistor R1, a control pole of the second switching transistor T2 is connected to a second switch control terminal D1, and a second terminal of the first voltage-dividing resistor R1 is connected to a first terminal of a second voltage-dividing resistor R2.
The second switching circuit 102 includes a third switching transistor T3, a fourth switching transistor T4, a first pole of the third switching transistor T3 is connected to the INPUT voltage terminal INPUT, a second pole of the third switching transistor T3 is connected to a first pole of the fourth switching transistor T4, and a control pole of the third switching transistor T3 is connected to a third switching control terminal D0'; a second pole of the fourth switching transistor T4 is connected to a first terminal of the second voltage-dividing resistor R2, a control pole of the fourth switching transistor T4 is connected to a fourth switch control terminal D1', and a second terminal of the second voltage-dividing resistor R2 is connected to a first terminal of the third voltage-dividing resistor R3.
The third switching circuit 103 includes a fifth switching transistor T5, a sixth switching transistor T6, a first pole of the fifth switching transistor T5 is connected to the INPUT voltage terminal INPUT, a second pole of the fifth switching transistor T5 is connected to a first pole of the sixth switching transistor T6, and a control pole of the fifth switching transistor T5 is connected to the first switch control terminal D0; a second pole of the sixth switching transistor T6 is connected to a first terminal of a third voltage-dividing resistor R3, a control pole of the sixth switching transistor T6 is connected to a fourth switch control terminal D1', and a second terminal of the third voltage-dividing resistor R3 is connected to a first terminal of a fourth voltage-dividing resistor R4.
The fourth switching circuit 104 includes a seventh switching transistor T7, an eighth switching transistor T8, a first pole of the seventh switching transistor T7 is connected to the INPUT voltage terminal INPUT, a second pole of the seventh switching transistor T7 is connected to the first pole of the eighth switching transistor T8, and a control pole of the seventh switching transistor T7 is connected to the third switch control terminal D0'; a second pole of the eighth switching transistor T8 is connected to the first end of the fourth voltage-dividing resistor R4, a control pole of the eighth switching transistor T8 is connected to the second switch control end D1, and a second end of the fourth voltage-dividing resistor R4 is connected to the reference voltage terminal Ref; a first terminal of the first capacitor C1 is connected to a first terminal of a fourth voltage-dividing resistor R4.
Wherein one of the first switch control terminal D0 and the third switch control terminal D0' provides a high level signal, and the other provides a low level signal; one of the second switch control terminal D1 and the fourth switch control terminal D1' provides a high level signal, and the other provides a low level signal. However, the specific signals provided by the switch control terminals of the embodiments of the present disclosure are not limited, and the signals provided by the first switch control terminal D0, the third switch control terminal D0 ', the second switch control terminal D1, and the fourth switch control terminal D1' may be configured according to actual needs. When a switch circuit needs to be turned on, a level signal for turning on the switch circuit may be provided to a switch control terminal corresponding to the switch circuit, for example, when the first switch circuit 101 needs to be turned on, a level signal for turning on the first switch transistor T1 is provided to the first switch control terminal D0, and a level signal for turning on the second switch transistor T2 is provided to the second switch control terminal D1, so that the first switch circuit 101 is turned on.
In some embodiments, the first to eighth switching transistors T1 to T8 may all adopt an N-type thin film transistor or a P-type thin film transistor, or one portion of them adopts an N-type thin film transistor and the other portion adopts a P-type thin film transistor, which may be configured according to practical situations, and the embodiment of the present disclosure does not limit this.
In some embodiments, the values of the snubber resistor R0, the first divider resistor R1, the second divider resistor R2, the third divider resistor R3, and the fourth divider resistor R4 are the same, for example, the values of the snubber resistor R0, the first divider resistor R1, the second divider resistor R2, the third divider resistor R3, and the fourth divider resistor R4 are all 1K Ω. However, this embodiment of the disclosure is not limited to this, the respective resistance values of the buffer resistor R0, the first divider resistor R1, the second divider resistor R2, the third divider resistor R3, and the fourth divider resistor R4 may also be set according to actual needs, for example, the resistance values of the first divider resistor R1, the second divider resistor R2, the third divider resistor R3, and the fourth divider resistor R4 may be set according to actual needed compensation voltage, and meanwhile, the size of the first capacitor C1 may also be set according to actual needs.
In some embodiments, the reference voltage terminal Ref is a ground terminal, and the reference voltage Vref may be 0V. In some embodiments, the INPUT voltage Vin provided by the INPUT voltage terminal INPUT may be a square wave voltage signal, for example, a square wave voltage signal with a high level of 1.2V, and the duration of the high level of the square wave voltage signal may be a scanning time of one row of pixels.
As shown in fig. 4, in some embodiments, the common voltage output circuit may further include a diode D disposed between the INPUT voltage terminal INPUT and the compensation voltage output module 10, that is, the INPUT voltage terminal INPUT is connected to the compensation voltage output module 10 through the diode D. A first end of the diode D is connected to the INPUT voltage terminal INPUT, and a second end of the diode D is connected to the compensation voltage output module 10. Specifically, the diode D is a forward conducting diode, an anode (a first end) of the diode D is connected to the INPUT voltage terminal INPUT, and a cathode (a second end) of the diode D is connected to the compensation voltage output module 10.
As shown in fig. 4, in some embodiments, an operational amplifier OP may be further disposed between the second end of the first capacitor C1 and the voltage OUTPUT terminal OUTPUT, a first input terminal of the operational amplifier OP is connected to the second end of the first capacitor C1, a second input terminal of the operational amplifier OP is connected to an OUTPUT terminal of the operational amplifier OP, an OUTPUT terminal of the operational amplifier OP is connected to the voltage OUTPUT terminal OUTPUT, V + is an operating voltage of the operational amplifier OP, and the operational amplifier OP can increase a voltage carrying capacity.
As shown in fig. 4, in some embodiments, the common voltage output circuit may further include a second capacitor C2, a first end of the second capacitor C2 is connected to the output end of the operational amplifier OP, a second end of the second capacitor C2 is connected to the reference voltage terminal Ref, and the second capacitor C2 may improve filtering effect and stability of the voltage output.
As shown in fig. 5, in some embodiments, the common voltage output circuit further includes a compensation control module 20, and the compensation control module 20 is connected to the INPUT voltage terminal INPUT. The compensation control module 20 is configured to provide an INPUT voltage Vin to the INPUT voltage terminal INPUT during a compensation phase; and in the compensation stage, providing a conducting signal to the switch control end corresponding to one of the switch circuits to enable the switch circuit corresponding to the switch control end to be conducted, and providing a closing signal to the switch control ends corresponding to the other switch circuits to enable the other switch circuits to be closed.
In particular, the compensation control module 20 is specifically configured to: in the scanning stage of the pixels of the current row, counting the gray scale change value of each row of pixels of the next row of pixels relative to the row of pixels of the current row of pixels; determining whether the common voltage corresponding to the next row of pixels needs to be compensated or not according to the gray scale change value corresponding to each row of pixels of the next row of pixels, and determining the current corresponding compensation grade; after determining that the common voltage corresponding to the next row of pixels needs to be compensated and the current corresponding compensation level, providing an INPUT voltage Vin to an INPUT voltage end INPUT in a scanning stage and a compensation stage of the next row of pixels; and determining the switch circuit needing to be conducted according to the current corresponding compensation grade so as to provide a conducting signal for the switch control end corresponding to the switch circuit and provide a closing signal for the switch control ends corresponding to the other switch circuits. Wherein the scanning phase for the next row of pixels comprises a compensation phase, which in some embodiments is a scanning phase for a row of pixels.
Wherein, for each row of pixels of the next row of pixels, the gray scale variation value corresponding to the row of pixels of the next row of pixels is the difference value between the gray scale corresponding to the row of pixels of the next row of pixels and the gray scale corresponding to the row of pixels of the current row of pixels. For example, if the gray scale corresponding to the row of pixels in the next row is 255 and the gray scale corresponding to the row of pixels in the current row is 200, the gray scale variation value corresponding to the row of pixels in the next row is 55.
In some embodiments, a switch circuit is disposed corresponding to each compensation level, and the compensation control module 20 may pre-store the corresponding relationship between the compensation level and the switch circuit, and may pre-configure the corresponding relationship between the compensation level and the on signal or the off signal provided by each switch control terminal. After determining the current corresponding compensation level, the compensation control module 20 may query the switch circuit to be turned on and the signal to be provided to the corresponding switch control terminal from the pre-stored corresponding relationship.
For example, as shown in table 1, 4 compensation levels are preset, which are L evel1, L evel2, L evel3 and L1 evel4 respectively, 4 switch circuits are correspondingly configured, as shown in fig. 2, 3 and 5, L evel1 corresponds to the first switch circuit 101, 1evel 1 corresponds to the second switch circuit 102, 1evel 1 corresponds to the third switch circuit 103, 1evel 1 corresponds to the fourth switch circuit 104, when it is determined that the common voltage corresponding to the next row of pixels needs to be compensated and the current corresponding compensation level is 1evel 1, it is determined that the switch circuit that needs to be turned on is the first switch circuit 101, the compensation control module 20 provides a turn-on signal to both the first switch control terminal D1 and the second switch control terminal D1 in the first switch circuit 101 according to the corresponding relationship of table 1, and the first switch control terminal D1 and the second switch control terminal D1 are turned on again by analogy, and the situation that the first switch control circuit 1 is determined that the first switch circuit 1 is the first switch 1, and the switch circuits 1 and the above-mentioned may be repeated.
TABLE 1
It is understood that the turn-on signal refers to a signal that can turn on a switching transistor in the switching circuit, such as a high level signal or a low level signal, and may be determined according to a transistor type of the switching transistor. Similarly, the turn-off signal refers to a signal that can turn off a switching transistor in a switching circuit.
When it is determined that the common voltage corresponding to the next row of pixels does not need to be compensated, the compensation control module 20 does not need to provide the INPUT voltage Vin to the INPUT voltage terminal INPUT, nor does it need to provide a turn-on signal to the switch circuit, at this time (during the non-compensation phase), the reference voltage terminal Ref keeps writing the reference voltage Vref to the first terminal of the first capacitor C1 through the fourth voltage dividing resistor R4, and the initial common voltage terminal U0 writes the initial common voltage Vcom0 to the second terminal of the first capacitor C1 through the buffer resistor R0, and OUTPUTs the initial common voltage Vcom0 through the voltage OUTPUT terminal OUTPUT.
In the present disclosure, the display panel can display L gray scales, and the total number of gray scales L that the display panel can display in the present disclosure is not limited, for example, the display panel can display 0 to 255 gray scales, that is, 256 gray scales, that is, L equals to 256, N compensation levels are preset, N is greater than or equal to 2, which can be written as L evel1 to L evelN, where each compensation level has a corresponding preset level dividing condition.
For the Nth-level compensation level, the corresponding level division condition is that for the gray scale change values corresponding to all rows of pixels of the next row of pixels, when the ratio of the number of gray scale change values which are greater than or equal to N × L/(N +1) to the total number of columns of the next row of pixels in the gray scale change values which change in the same direction is greater than or equal to a preset ratio, the compensation level currently corresponding to the next row of pixels is the Nth level (L evelN).
Aiming at the ith compensation grade, i is more than or equal to 1 and less than or equal to (N-1), and the corresponding grade division condition is that aiming at the gray scale change values corresponding to all the rows of pixels of the next row of pixels, when the ratio of the number of the gray scale change values, which is more than or equal to i L/(N +1), to the total number of the rows of pixels in the next row, is more than or equal to a preset ratio, and the ratio of the number of the gray scale change values, which is less than (i +1) L/(N +1), to the total number of the rows of pixels in the next row, is more than (1-preset ratio), the compensation grade corresponding to the next row of pixels at present is the ith grade (L evel), wherein the equidirectional change refers to the positive value or the negative value.
When the ratio of the number of gray scale change values with the absolute value less than 1 × L/(N +1) to the total number of columns of the next row of pixels in the gray scale change values with the same direction change is greater than (1-preset ratio), it is determined that the common voltage corresponding to the next row of pixels does not need to be compensated.
For example, assuming that L is 256, N is 4, the display panel has 1000 columns of pixels in total, and the predetermined ratio is 40%, then according to the above-mentioned gradation dividing condition, when the absolute value of 40% or more of the gray scale variation values corresponding to 1000 columns of pixels in a row of pixels is greater than or equal to 4 256/5 ≈ 204, it is determined that the currently corresponding compensation level of the row of pixels is 4 th level (L even 4), when the absolute value of 40% or more of the gray scale variation values in the same direction is greater than or equal to 3 256/5 ≈ 153, and when the absolute value of 60% or more of the gray scale variation values in the same direction is less than 204, it is determined that the currently corresponding compensation level of the row of pixels is 3 rd level (L even35), when the absolute value of 40% or more of the gray scale variation values in the same direction is greater than or equal to 3 × 256/5 ≈ 153, and when the absolute value of 60% of the gray scale variation values in the same direction is greater than 204, it is determined that the currently corresponding compensation level is equal to 3 rd level (L even34 th level) or more than the absolute value of the gray scale variation values in the row of the same direction, and when the absolute value of 40% or more than the absolute value of the gray scale variation values in the same direction is equal to 5 th level of the corresponding gray scale variation values in the row of the same direction, it is determined that the gray scale variation values of the compensation level is equal to the absolute value of the corresponding pixels, it is equal to 102, it is equal to or less than or equal to the absolute value of 30%, and equal to the absolute value of the corresponding compensation level of 30 th level (when the absolute value of the row of 30 th level of.
Therefore, according to the gradation dividing condition of the compensation level, after the compensation control module 20 counts the gray scale change value corresponding to each row of pixels in the next row of pixels, it can determine whether compensation needs to be performed on the common voltage corresponding to the next row of pixels and the current corresponding compensation level according to the gradation dividing condition of the compensation level.
In the embodiment of the present disclosure, the magnitude of the corresponding compensation voltage may be configured according to the compensation levels, for example, according to the principle that the compensation levels are from small to large, by reasonably configuring the resistance values of the voltage dividing resistors, the compensation voltage may be configured from small to large according to the corresponding compensation levels, that is, the compensation voltage corresponding to the 1 st compensation level is less than the compensation voltage corresponding to the 2 nd compensation level is less than … … and less than the compensation voltage corresponding to the nth compensation level.
The operation of the common voltage output circuit according to the embodiment of the present disclosure is further explained with reference to fig. 5 and 6.
As shown in fig. 6, when the data voltage Vdata supplied to the pixel electrode by the data line (Source line) changes, that is, when the gray level jumps, the common voltage Vcom0 of the common electrode is also liable to generate a transient jump (Ripple) due to the coupling effect of the parasitic capacitance, wherein, in the actual test, as shown in fig. 6, when the data voltage Vdata supplied to the pixel electrode by the data line (Source line) increases or decreases, the common voltage Vcom0 generates a jump that rises after falling. Thereby easily causing the horizontal Crosstalk (Crosstalk) of the row pixels with gray level jump.
To solve the above problem, in the embodiment of the present disclosure, before the scanning phase of the next row of pixels starts, the compensation control module 20 determines whether the common voltage corresponding to the row of pixels needs to be compensated and the compensation level according to the gray scale variation values corresponding to all columns of pixels of the next row of pixels, and at the beginning of the scanning phase (compensation phase) of the next row of pixels, while the data line (Source line) provides the corresponding data voltage to the correspondingly connected pixels (pixel electrodes), the compensation control module 20 provides the INPUT voltage Vin to the INPUT voltage terminal INPUT, for example, the INPUT voltage Vin is a square wave voltage signal with a high level of 1.2V, and provides a conducting signal to the corresponding switch circuit according to the determined compensation level, so as to write the currently required compensation voltage Vj. to the first end of the first capacitor C1, for example, as shown in fig. 5, assuming that the determined compensation level is the 1 st level (L ev 1), the first switch circuit 101 is turned on, and the compensation voltage Vj is equivalent to Vj — vr 4R 31 + R31/(R2), and the second compensation level is assumed to be the second switch 2/(R9).
After the compensation voltage Vj is written into the first end of the first capacitor C1, under the bootstrap action of the first capacitor C1, the voltage at the second end of the first capacitor C1 changes accordingly, so that the voltage at the second end of the first capacitor C1 changes from the initial supply voltage Vcom0 to the sum of the initial common voltage Vcom0 and the compensation voltage Vj in the compensation stage, thereby compensating for the jump of the initial common voltage Vcom0 caused by the gray scale jump when the initial common voltage Vcom0 is output to the common electrode. The time and the rate of change of the voltage can be controlled by configuring the size of the first capacitor C1 and the size of the buffer resistor R0.
In the embodiments of the present disclosure, the display panel may be a thin film transistor liquid crystal display panel (TFT-L CD) based on advanced super dimension field switching technology (ADS) display mode.
In the disclosed embodiment, the common voltage output circuit includes a timing control chip (TCON IC), and the compensation control module 20 may be disposed in the timing control chip.
The common voltage output circuit provided by the embodiment of the disclosure is applied to a display panel, the display panel comprises a plurality of pixels arranged in an array, in a scanning display process, when gray scales corresponding to a plurality of rows of pixels in adjacent rows have large jumps in the same direction, a compensation voltage required currently is generated by a compensation voltage output module, an initial common voltage Vcom0 provided by an initial common voltage end is compensated by a first capacitor, and finally the compensated common voltage is output to a common electrode of the display panel through a voltage output end, so that instantaneous jumps (Ripple) generated by coupling of the common voltage due to the gray scale jumps are compensated, a transverse crosstalk bad phenomenon existing in the row pixels with the gray scale jumps is effectively improved, and a display effect of the display panel is effectively improved.
The embodiment of the present disclosure further provides a display device, where the display device includes a display panel and a common voltage output circuit, the common voltage output circuit includes the common voltage output circuit provided in any of the foregoing embodiments, and for specific description of the common voltage output circuit, reference may be made to the description of any of the foregoing embodiments, and details are not repeated here.
As shown in fig. 7, an embodiment of the present disclosure provides a common voltage compensation method, which is implemented based on the common voltage output circuit provided in any of the foregoing embodiments, and the method includes:
step S1, in the non-compensation stage, the compensation voltage output module writes the reference voltage provided by the reference voltage terminal into the first terminal of the first capacitor, and the initial common voltage terminal writes the initial common voltage into the second terminal of the first capacitor, so as to output the initial common voltage through the voltage output terminal.
Step S2, in the compensation stage, the compensation voltage output module generates a currently required compensation voltage based on the input voltage provided by the input voltage terminal, and writes the compensation voltage into the first terminal of the first capacitor, so as to compensate the initial common voltage output by the initial common voltage terminal, and output the initial common voltage through the voltage output terminal.
In some embodiments, in the case that the compensation voltage output module includes a plurality of switch circuits, and the common voltage output circuit further includes a compensation control module, and the common voltage output circuit is used for a display panel including a plurality of pixels arranged in an array, as shown in fig. 8, the method further includes, before step S2:
step S201, in the scanning stage of the pixels in the current row, the compensation control module counts a gray scale variation value of each row of pixels of the pixels in the next row relative to the row of pixels of the pixels in the current row.
Step S202, the compensation control module determines whether compensation needs to be performed on the common voltage corresponding to the next row of pixels according to the gray scale change value corresponding to each row of pixels in the next row of pixels, and determines the current corresponding compensation level.
Step S203, after determining that the common voltage corresponding to the next row of pixels needs to be compensated and the current corresponding compensation level, the compensation control module provides the input voltage to the input voltage terminal in the scanning stage and the compensation stage of the next row of pixels, and determines the switch circuit needing to be turned on according to the current corresponding compensation level, so as to provide the on signal to the switch control terminal corresponding to the switch circuit and provide the off signal to the switch control terminals corresponding to the other switch circuits.
In addition, for specific descriptions of the common voltage output circuit and the common voltage compensation method according to the embodiments of the disclosure, reference may be made to the related descriptions of the foregoing embodiments, and details are not repeated herein.
It is to be understood that the above embodiments are merely exemplary embodiments that are employed to illustrate the principles of the present disclosure, and that the present disclosure is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the disclosure, and these are to be considered as the scope of the disclosure.
Claims (12)
1. A common voltage output circuit, comprising: the compensation voltage output module, the first capacitor, the initial common voltage end, the buffer resistor and the voltage output end; the compensation voltage output module is connected with an input voltage end, a reference voltage end and a first end of the first capacitor, the initial common voltage end is connected with a first end of the buffer resistor, a second end of the buffer resistor is connected with a second end of the first capacitor, and the second end of the first capacitor is also connected with the voltage output end;
the compensation voltage output module is configured to enable a reference voltage provided by the reference voltage end to be written into the first end of the first capacitor in a non-compensation stage; in the compensation stage, generating a currently required compensation voltage based on an input voltage provided by the input voltage end, writing the compensation voltage into the first end of the first capacitor so as to compensate the initial common voltage output by the initial common voltage end, and outputting the initial common voltage through the voltage output end;
the initial common voltage terminal is configured to write the initial common voltage to the second terminal of the first capacitor in the non-compensation phase to output the initial common voltage through the voltage output terminal.
2. The common voltage output circuit according to claim 1, wherein the compensation voltage output module comprises: the voltage divider comprises a plurality of switch circuits, switch control ends corresponding to the switch circuits and voltage dividing resistors which are arranged in one-to-one correspondence with the switch circuits;
the input ends of the switch circuits are connected with the input voltage end, and the corresponding divider resistors of the switch circuits are connected in series; the output end of each switch circuit is connected with the first end of the corresponding divider resistor; except the divider resistor positioned at the last position, the second end of each divider resistor is connected with the first end of the adjacent divider resistor, and the second end of the divider resistor positioned at the last position is connected with the reference voltage end; the first end of the first capacitor is connected to the first end of the divider resistor at the last position;
the control end of each switch circuit is connected with the corresponding switch control end, and the switch circuit is configured to be switched on or switched off in response to the control of the corresponding switch control end.
3. The common voltage output circuit according to claim 2, wherein the plurality of switch circuits includes a first switch circuit, a second switch circuit, a third switch circuit, and a fourth switch circuit, and a voltage dividing resistor corresponding to each switch circuit is a first voltage dividing resistor, a second voltage dividing resistor, a third voltage dividing resistor, and a fourth voltage dividing resistor in this order;
the first switch circuit comprises a first switch transistor and a second switch transistor, wherein a first pole of the first switch transistor is connected with the input voltage end, a second pole of the first switch transistor is connected with a first pole of the second switch transistor, and a control pole of the first switch transistor is connected with a first switch control end; a second pole of the second switching transistor is connected with a first end of the first voltage-dividing resistor, a control pole of the second switching transistor is connected with a second switching control end, and a second end of the first voltage-dividing resistor is connected with a first end of the second voltage-dividing resistor;
the second switch circuit comprises a third switch transistor and a fourth switch transistor, wherein the first pole of the third switch transistor is connected with the input voltage end, the second pole of the third switch transistor is connected with the first pole of the fourth switch transistor, and the control pole of the third switch transistor is connected with the control end of the third switch transistor; a second pole of the fourth switching transistor is connected with a first end of the second voltage-dividing resistor, a control pole of the fourth switching transistor is connected with a fourth switch control end, and a second end of the second voltage-dividing resistor is connected with a first end of the third voltage-dividing resistor;
the third switch circuit comprises a fifth switch transistor and a sixth switch transistor, wherein the first pole of the fifth switch transistor is connected with the input voltage end, the second pole of the fifth switch transistor is connected with the first pole of the sixth switch transistor, and the control pole of the fifth switch transistor is connected with the first switch control end; a second pole of the sixth switching transistor is connected to the first terminal of the third voltage dividing resistor, a control pole of the sixth switching transistor is connected to the control terminal of the fourth switch, and a second terminal of the third voltage dividing resistor is connected to the first terminal of the fourth voltage dividing resistor;
the fourth switching circuit comprises a seventh switching transistor and an eighth switching transistor, wherein the first pole of the seventh switching transistor is connected with the input voltage end, the second pole of the seventh switching transistor is connected with the first pole of the eighth switching transistor, and the control pole of the seventh switching transistor is connected with the control end of the third switch; a second pole of the eighth switching transistor is connected to a first end of the fourth voltage-dividing resistor, a control pole of the eighth switching transistor is connected to the control end of the second switch, and a second end of the fourth voltage-dividing resistor is connected to the reference voltage end;
the first end of the first capacitor is connected to the first end of the fourth voltage-dividing resistor.
4. The common voltage output circuit according to claim 2 or 3, further comprising a compensation control module, wherein the compensation control module is connected to the input voltage terminal;
the compensation control module is configured to provide the input voltage to the input voltage terminal during the compensation phase; and in the compensation stage, providing a conducting signal to a switch control end corresponding to one of the switch circuits to enable the switch circuit corresponding to the switch control end to be conducted, and providing a closing signal to switch control ends corresponding to the other switch circuits to enable the other switch circuits to be closed.
5. The common voltage output circuit of claim 4, wherein the common voltage output circuit is used for a display panel comprising a plurality of pixels arranged in an array, the compensation control module being specifically configured to:
in the scanning stage of the pixels of the current row, counting the gray scale change value of each row of pixels of the next row of pixels relative to the row of pixels of the current row of pixels; determining whether the common voltage corresponding to the next row of pixels needs to be compensated or not according to the gray scale change value corresponding to each row of pixels of the next row of pixels, and determining the current corresponding compensation grade;
after determining that the common voltage corresponding to the next row of pixels needs to be compensated and the current corresponding compensation level, providing the input voltage to the input voltage end in the scanning stage of the next row of pixels and in the compensation stage; and determining the switch circuit needing to be conducted according to the current corresponding compensation grade so as to provide a conducting signal for the switch control end corresponding to the switch circuit and provide a closing signal for the switch control ends corresponding to the other switch circuits.
6. The common voltage output circuit as claimed in claim 5, wherein the display panel is capable of displaying L gray scales, N compensation levels are preset, N is greater than or equal to 2, each compensation level is provided with a corresponding switch circuit, and for each row of pixels of the next row, the gray scale variation value corresponding to the row of pixels of the next row is the difference between the gray scale corresponding to the row of pixels of the next row and the gray scale corresponding to the row of pixels of the current row;
the determining whether the common voltage corresponding to the next row of pixels needs to be compensated according to the change value of the gray scale corresponding to each row of pixels of the next row of pixels and determining the current corresponding compensation level includes:
aiming at gray scale change values corresponding to all rows of pixels in the next row of pixels, when the ratio of the number of gray scale change values which are greater than or equal to N × L/(N +1) in the gray scale change values which change in the same direction to the total number of rows of pixels in the next row is greater than or equal to a preset ratio, determining that the common voltage corresponding to the pixels in the next row needs to be compensated and the current corresponding compensation grade is the Nth grade;
when the ratio of the number of gray scale change values in the same-direction change to the total number of columns of the next row of pixels is greater than or equal to i L/(N +1), and the ratio of the number of gray scale change values in the same-direction change to the total number of columns of the next row of pixels is greater than or equal to a preset ratio, and the ratio of the number of gray scale change values in the same-direction change to the total number of columns of the next row of pixels is less than (i +1) × L/(N +1), determining that the common voltage corresponding to the next row of pixels needs to be compensated, the current corresponding compensation grade is the ith grade, and i is greater than or equal to 1 and less than or equal to (N-1);
when the ratio of the number of the gray scale change values with the absolute value smaller than 1 × L/(N +1) to the total column number of the next row of pixels in the gray scale change values with the same direction change is larger than (1-preset ratio), determining that the common voltage corresponding to the next row of pixels does not need to be compensated;
wherein, the same direction change means that the same positive value or the same negative value is used.
7. The common voltage output circuit according to claim 1, wherein a diode is further disposed between the input voltage terminal and the compensation voltage output module, a first terminal of the diode is connected to the input voltage terminal, and a second terminal of the diode is connected to the compensation voltage output module.
8. The common voltage output circuit according to claim 1, wherein an operational amplifier is further provided between the second terminal of the first capacitor and the voltage output terminal;
the first input end of the operational amplifier is connected with the second end of the first capacitor, the second input end of the operational amplifier is connected with the output end of the operational amplifier, and the output end of the operational amplifier is connected with the voltage output end.
9. The common voltage output circuit according to claim 8, further comprising a second capacitor, wherein a first terminal of the second capacitor is connected to the output terminal of the operational amplifier, and a second terminal of the second capacitor is connected to the reference voltage terminal.
10. A display device comprising a display panel and the common voltage output circuit according to any one of claims 1 to 9.
11. A common voltage compensation method based on the common voltage output circuit according to any one of claims 1 to 9, the method comprising:
in a non-compensation stage, the compensation voltage output module enables a reference voltage provided by the reference voltage end to be written into a first end of the first capacitor, and the initial common voltage end writes the initial common voltage into a second end of the first capacitor so as to output the initial common voltage through the voltage output end;
in the compensation stage, the compensation voltage output module generates a currently required compensation voltage based on an input voltage provided by the input voltage terminal, and writes the compensation voltage into the first terminal of the first capacitor, so as to compensate an initial common voltage output by the initial common voltage terminal, and output the initial common voltage through the voltage output terminal.
12. The common voltage compensation method according to claim 11, wherein the common voltage output circuit is the common voltage output circuit according to claim 5, the common voltage output circuit is used for a display panel, and the display panel comprises a plurality of pixels arranged in an array;
before the compensation stage, the compensation voltage output module generates a currently required compensation voltage based on the input voltage provided by the input voltage terminal, the method further includes:
in the scanning stage of the pixels of the current row, the compensation control module counts the gray scale change value of each row of pixels of the next row relative to the row of pixels of the current row; determining whether the common voltage corresponding to the next row of pixels needs to be compensated or not according to the gray scale change value corresponding to each row of pixels of the next row of pixels, and determining the current corresponding compensation grade;
after determining that the common voltage corresponding to the next row of pixels needs to be compensated and the current corresponding compensation grade, the compensation control module provides the input voltage to the input voltage end in the scanning stage of the next row of pixels and in the compensation stage, and determines the switch circuit needing to be switched on according to the current corresponding compensation grade so as to provide a switching-on signal to the switch control end corresponding to the switch circuit and provide a switching-off signal to the switch control ends corresponding to the other switch circuits.
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