CN107993628B - Common voltage compensation circuit, compensation method thereof, display panel and display device - Google Patents
Common voltage compensation circuit, compensation method thereof, display panel and display device Download PDFInfo
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- CN107993628B CN107993628B CN201810078845.0A CN201810078845A CN107993628B CN 107993628 B CN107993628 B CN 107993628B CN 201810078845 A CN201810078845 A CN 201810078845A CN 107993628 B CN107993628 B CN 107993628B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
- G09G3/3655—Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
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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
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0421—Structural details of the set of electrodes
- G09G2300/0426—Layout of electrodes and connections
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- 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
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- 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
- G09G2320/0223—Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
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Abstract
The invention discloses a public voltage compensation circuit, a compensation method thereof, a display panel and a display device, comprising: the device comprises a filtering module, a high-impedance input module, an inverting module and an amplifying module; the filtering module receives the feedback signal, filters the feedback signal to obtain a noise signal, and provides the noise signal to the high-impedance input module; the high-impedance input module receives a noise signal without voltage loss, amplifies the received noise signal and provides the amplified noise signal to the phase inversion module; the inverting module inverts the received noise signal and provides the inverted noise signal to the amplifying module; the amplifying module generates a compensated common voltage signal according to the noise signal and the common voltage signal output by the inverting module, and provides the compensated common voltage signal to the signal output end. Therefore, the noise signal in the feedback signal is input into the high-impedance input module without voltage loss and matched with other modules, and the common voltage signal is compensated according to the received noise signal, so that the compensation precision is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a common voltage compensation circuit, a compensation method thereof, a display panel and a display device.
Background
In a Liquid Crystal Display (LCD), a common voltage fluctuates due to a coupling capacitance between a common electrode and a part of signal lines, so that a picture Display is not good. In order to improve the display effect, a common voltage compensation circuit is generally disposed in the display panel to compensate the common voltage.
Currently, as shown in fig. 1, a general common voltage compensation circuit includes: and the negative phase input end of the operational amplifier receives the feedback signal Vf, the positive phase input end of the operational amplifier receives the common voltage signal Vcom, and the output end of the operational amplifier outputs the compensated common voltage signal Vcout so as to compensate the common voltage signal according to the feedback signal through the operational amplifier. However, the feedback signal is a signal generated by collecting a common voltage on a common electrode in the LCD display panel. The feedback signal is weak, and the impedance of the circuit generating the feedback signal is larger than that of the common voltage compensation circuit, so that the circuit generating the feedback signal divides the voltage of the feedback signal, the voltage of the feedback signal cannot be completely input into the common voltage compensation circuit, and the compensation effect on the common voltage is poor and the precision is reduced.
Disclosure of Invention
The embodiment of the invention provides a common voltage compensation circuit, a compensation method thereof, a display panel and a display device, which are used for solving the problems of poor compensation effect and low precision in the prior art.
Therefore, an embodiment of the present invention provides a common voltage compensation circuit, including: the device comprises a filtering module, a high-impedance input module, an inverting module and an amplifying module; wherein the content of the first and second substances,
the filtering module is used for receiving a feedback signal, filtering the feedback signal to obtain a noise signal and providing the noise signal to the high-impedance input module;
the high impedance input module is used for receiving the noise signal without voltage loss, amplifying the received noise signal and providing the amplified noise signal to the phase inversion module;
the inverting module is used for inverting the noise signal output by the high-impedance input module and then providing the inverted noise signal to the amplifying module;
the amplifying module is used for generating a compensated common voltage signal according to the noise signal and the common voltage signal output by the inverting module and providing the compensated common voltage signal to a signal output end.
Optionally, in the above-mentioned common voltage compensation circuit provided in the embodiment of the present invention, the high impedance input module includes: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first operational amplifier and a second operational amplifier; wherein the content of the first and second substances,
the first end of the first resistor is connected with the filtering module and used for receiving the noise signal output by the filtering module, and the second end of the first resistor is respectively connected with the first end of the second resistor and the negative phase input end of the first operational amplifier;
the positive phase input end of the first operational amplifier is connected with the first end of the third resistor, and the output end of the first operational amplifier is connected with the inverting module and used for providing the amplified noise signal to the inverting module;
a negative phase input end of the second operational amplifier is connected with a first end of the fourth resistor and a first end of the fifth resistor respectively, a positive phase input end of the second operational amplifier is connected with a first end of the sixth resistor, and an output end of the second operational amplifier is connected with a second end of the fifth resistor and a first end of the seventh resistor respectively;
the second end of the second resistor is respectively connected with the second end of the fourth resistor and the output end of the first operational amplifier;
the second end of the third resistor and the second end of the sixth resistor are both connected with a ground terminal;
and the second end of the seventh resistor is connected with the first end of the first resistor.
Optionally, in the common voltage compensation circuit provided in the embodiment of the present invention, a resistance of the first resistor is equal to a resistance of the seventh resistor, a resistance of the second resistor is equal to a resistance of the fourth resistor, and a resistance of the fifth resistor is 2 times as large as a resistance of the first resistor.
Optionally, in the common voltage compensation circuit provided in the embodiment of the present invention, a resistance of the second resistor is greater than a resistance of the first resistor.
Optionally, in the above-mentioned common voltage compensation circuit provided in the embodiment of the present invention, the filtering module includes: a filter capacitor;
and the first end of the filter capacitor is used for receiving the feedback signal, and the second end of the filter capacitor is connected with the high-impedance input module and used for outputting the filtered noise signal.
Optionally, in the above-mentioned common voltage compensation circuit provided in the embodiment of the present invention, the inverting module includes: an eighth resistor, a ninth resistor, a tenth resistor, and a third operational amplifier; wherein the content of the first and second substances,
a first end of the eighth resistor is connected with the high-impedance input module and used for receiving the noise signal output by the high-impedance input module, and a second end of the eighth resistor is respectively connected with a first end of the ninth resistor and a negative phase input end of the third operational amplifier;
a positive phase input end of the third amplifier is connected with a first end of the tenth resistor, and an output end of the third operational amplifier is connected with the amplifying module and used for providing the noise signal after phase inversion to the amplifying module;
a second end of the ninth resistor is connected with an output end of the third operational amplifier;
and the second end of the tenth resistor is connected with the ground terminal.
Optionally, in the above-mentioned common voltage compensation circuit provided in the embodiment of the present invention, the amplifying module includes: an eleventh resistor, a twelfth resistor, and a differential amplifier; wherein the content of the first and second substances,
a first end of the eleventh resistor is connected to the inverting module and configured to receive the noise signal output by the inverting module, and a second end of the eleventh resistor is connected to a first end of the twelfth resistor and a negative-phase input end of the differential amplifier, respectively;
the positive phase input end of the differential amplifier is used for receiving the common voltage signal, and the output end of the differential amplifier is connected with the signal output end and used for providing the compensated common voltage signal to the signal output end;
and the second end of the twelfth resistor is connected with the output end of the differential amplifier.
Correspondingly, the embodiment of the invention also provides a display panel which comprises any one of the public voltage compensation circuits provided by the embodiment of the invention.
Correspondingly, the embodiment of the invention also provides a display device which comprises the display panel provided by the embodiment of the invention.
Correspondingly, an embodiment of the present invention further provides a compensation method for any one of the above-mentioned common voltage compensation circuits provided by the embodiment of the present invention, including:
the filtering module receives the feedback signal, filters the feedback signal to obtain the noise signal, and provides the noise signal to the high-impedance input module;
the high-impedance input module receives the noise signal without voltage loss, amplifies the received noise signal and provides the amplified noise signal to the phase inversion module;
the phase inversion module inverts the noise signal output by the high impedance input module and provides the inverted noise signal to the amplification module;
the amplifying module generates a compensated common voltage signal according to the noise signal and the common voltage signal output by the inverting module, and provides the compensated common voltage signal to the signal output end.
The embodiment of the invention has the beneficial effects that:
the embodiment of the invention provides a common voltage compensation circuit, a compensation method thereof, a display panel and a display device, which comprise: the device comprises a filtering module, a high-impedance input module, an inverting module and an amplifying module; the filtering module receives a feedback signal, filters the feedback signal to obtain a noise signal, and provides the noise signal to the high-impedance input module; the high-impedance input module receives a noise signal without voltage loss, amplifies the received noise signal and provides the amplified noise signal to the phase inversion module; the inverting module inverts the received noise signal and provides the inverted noise signal to the amplifying module; the amplifying module generates a compensated common voltage signal according to the noise signal and the common voltage signal output by the inverting module, and provides the compensated common voltage signal to the signal output end. Therefore, the noise signal in the feedback signal is input into the high-impedance input module without voltage loss and is matched with other modules, the common voltage signal can be compensated according to the received noise signal, and the compensation precision is improved.
Drawings
FIG. 1 is a schematic diagram of a common voltage compensation circuit in the prior art;
fig. 2 is a schematic structural diagram of a common voltage compensation circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a common voltage compensation circuit according to an embodiment of the present invention;
fig. 4 is a flowchart of a compensation method of a common voltage compensation circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, specific embodiments of a common voltage compensation circuit, a compensation method thereof, a display panel and a display device according to an embodiment of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments described below are only for illustrating and explaining the present invention and are not to be used for limiting the present invention. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
In the LCD display panel, the common voltage is unstable and fluctuates due to the coupling capacitance between the common electrode and a part of the signal lines, so that the picture display is not good, and thus, it is necessary to compensate the common voltage by using the feedback signal. The feedback signal is generated by collecting the common voltage in the LCD display panel, but in the collecting process, due to the effect of the coupling capacitance formed between the common electrode and a part of the signal lines, the feedback signal includes two parts, namely a dc voltage signal related to the common voltage signal and a noise signal with an ac voltage caused by the coupling capacitance. When the fluctuation of the common voltage signal is compensated, the fluctuation of the common voltage signal is generally compensated according to the noise signal in the feedback signal, so that the compensated common voltage signal has no fluctuation theoretically, and the display effect is improved.
Based on this, an embodiment of the present invention provides a common voltage compensation circuit, as shown in fig. 2, including a filtering module 1, a high impedance input module 2, an inverting module 3, and an amplifying module 4; wherein the content of the first and second substances,
the filtering module 1 is used for receiving the feedback signal Vf, filtering the feedback signal Vf to obtain a noise signal, and providing the noise signal to the high-impedance input module 2;
the high-impedance input module 2 is used for receiving a noise signal without voltage loss, amplifying the received noise signal and providing the amplified noise signal to the phase inversion module 3;
the inverting module 3 is used for inverting the noise signal output by the high-impedance input module 2 and providing the inverted noise signal to the amplifying module 4;
the amplifying module 4 is configured to generate a compensated common voltage signal according to the noise signal and the common voltage signal Vcom output by the inverting module, and provide the compensated common voltage signal to the signal output terminal Vout.
In the common voltage compensation circuit provided by the embodiment of the invention, the filtering module receives the feedback signal, filters the feedback signal to obtain a noise signal, and provides the noise signal to the high-impedance input module; the high-impedance input module receives a noise signal without voltage loss, amplifies the received noise signal and provides the amplified noise signal to the phase inversion module; the inverting module inverts the received noise signal and provides the inverted noise signal to the amplifying module; the amplifying module generates a compensated common voltage signal according to the noise signal and the common voltage signal output by the inverting module, and provides the compensated common voltage signal to the signal output end. Therefore, the noise signal in the feedback signal is input into the high-impedance input module without voltage loss and is matched with other modules, the common voltage signal can be compensated according to the received noise signal, and the compensation precision is improved.
In practical implementation, in the common voltage compensation circuit provided in the embodiment of the present invention, as shown in fig. 2, the filtering module 1 receives the feedback signal Vf and is connected to the high impedance input module 2. The high-impedance input module 2 is connected with the phase inversion module 3, the phase inversion module 3 is also connected with the amplification module 4, and the amplification module 4 is also connected with the signal output end Vout.
The present invention will be described in detail with reference to specific examples. It should be noted that the present embodiment is intended to better explain the present invention, but not to limit the present invention.
In order to obtain the noise signal of the ac voltage from the feedback signal, in a specific implementation, in the common voltage compensation circuit provided in the embodiment of the present invention, as shown in fig. 3, the filtering module 1 may specifically include: a filter capacitor C1;
a first end of the filter capacitor C1 is configured to receive the feedback signal Vf, and a second end of the filter capacitor C1 is connected to the high-impedance input module 2, and outputs a filtered noise signal.
In practical implementation, in the common voltage compensation circuit provided in the embodiment of the present invention, as shown in fig. 3, the filter capacitor C1 may filter the feedback signal Vf to obtain a filtered noise signal Vf1, and provide the filtered noise signal Vf1 to the high-impedance input module 2.
Specifically, in the implementation, in the common voltage compensation circuit provided in the embodiment of the present invention, as shown in fig. 3, the high impedance input module 2 may specifically include: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first operational amplifier N1 and a second operational amplifier N2;
a first end of the first resistor R1 is connected to the filtering module 1 for receiving the noise signal output by the filtering module, and a second end of the first resistor R1 is connected to a first end of the second resistor R2 and a negative-phase input end of the first operational amplifier N1, respectively;
the non-inverting input end of the first operational amplifier N1 is connected to the first end of the third resistor R3, and the output end of the first operational amplifier N1 is connected to the inverting module 3, for providing the amplified noise signal to the inverting module 3;
a negative phase input end of a second operational amplifier N2 is respectively connected with a first end of a fourth resistor R4 and a first end of a fifth resistor R5, a positive phase input end of the second operational amplifier N2 is connected with a first end of a sixth resistor R6, and an output end of a second operational amplifier N2 is respectively connected with a second end of a fifth resistor R5 and a first end of a seventh resistor R7;
a second end of the second resistor R2 is connected to a second end of the fourth resistor R4 and the output end of the first operational amplifier N1, respectively;
the second end of the third resistor R3 and the second end of the sixth resistor R6 are both connected to the ground GND;
a second terminal of the seventh resistor R7 is connected to a first terminal of the first resistor R1.
In a specific implementation, in the common voltage compensation circuit provided in the embodiment of the invention, as shown in fig. 3, the first to seventh resistors R1 to R7, the first operational amplifier N1, and the second operational amplifier N2 may form a bootstrap high input impedance circuit. Specifically, the first resistor R1 receives the noise signal Vf1 outputted from the filtering module and provides the noise signal Vf1 to the first operational amplifier N1, so as to amplify the noise signal Vf1 through the first operational amplifier N1 and generate an amplified noise signal V1, wherein,
wherein Vf1Representing the voltage, V, of the noise signal Vf1 output by the filtering module1Representing the voltage, r, of the amplified noise signal V11And r2Respectively representing the resistance of the first resistor R1 and the second resistor R2. The amplified noise signal V1 is transmitted to the second operational amplifier N2 and processed by the second operational amplifier N2 to generate a corresponding voltage signal V2, wherein,
wherein V2Representing the voltage, r, of the voltage signal V24And r5Respectively representing the resistance of the fourth resistor R4 and the fifth resistor R5. The current generated by the voltage signal V2 flows through the seventh resistor R7 and the first resistor R1 and is fed back to the first operational amplifier N1.
With i0Representing the current, i, of the noise signal Vf1 output by the filtering module 11Representing the current, i, input to the negative input of the first operational amplifier N12Represents the current output by the output of the second operational amplifier N2, then i0、i1And i2The following formula can be satisfied:
wherein r is7Representing the resistance of the seventh resistor R7.
According to the above formula, when r1＝r7When i is00, i1＝i2The current i input to the first operational amplifier N1 is explained1The current i that can be output entirely by the second operational amplifier N22Provided is a method. Therefore, the equivalent impedance of the bootstrap high input impedance circuit formed by the first to seventh resistors R1 to R7, the first operational amplifier N1, and the second operational amplifier N2 is infinite, so that the potential of the input end of the noise signal is equal to the potential of the output end of the circuit generating the noise signal within the error allowable range, the noise signal Vf1 is not divided by the circuit generating the feedback signal Vf, the current demanded by the input common voltage compensation circuit is reduced, and the voltage of the noise signal Vf1 is input to the first operational amplifier N1 after being input to the first resistor R1 without voltage loss, so as to perform amplification processing.
In a specific implementation, the resistance of the first resistor may be equal to the resistance of the seventh resistor, the resistance of the second resistor may be equal to the resistance of the fourth resistor, and the resistance of the fifth resistor may be 2 times the resistance of the first resistor. In this way, the impedance of the bootstrap high input impedance circuit including the first to seventh resistors, the first operational amplifier, and the second operational amplifier can be made infinite, and the voltage of the noise signal can be input to the first operational amplifier through the first resistor without voltage loss.
In a specific implementation, the resistance of the second resistor may be greater than the resistance of the first resistor. This makes it possible to amplify the noise signal Vf 1.
Specifically, in the implementation, in the common voltage compensation circuit provided in the embodiment of the present invention, as shown in fig. 3, the inverting module 3 may specifically include: an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and a third operational amplifier N3;
a first end of the eighth resistor R8 is connected to the high impedance input module 2, and is configured to receive the noise signal V1 output by the high impedance input module 2, and a second end of the eighth resistor R8 is connected to a first end of the ninth resistor R9 and a negative phase input end of the third operational amplifier N3, respectively;
the non-inverting input terminal of the third amplifier N3 is connected to the first terminal of the tenth resistor R10, and the output terminal of the third operational amplifier N3 is connected to the amplifying block 4, for providing the noise signal after phase inversion to the amplifying block 4;
a second end of the ninth resistor R9 is connected to the output end of the third operational amplifier N3;
a second terminal of the tenth resistor R10 is connected to the ground GND.
In a specific implementation, in the common voltage compensation circuit provided in the embodiment of the present invention, the third operational amplifier N3 may receive the noise signal V1 output by the high impedance input block 2 and perform an inversion process on the noise signal V1 to generate an inverted noise signal V3. So that the voltage of the noise signal V3 after the inversion has the same sign as the voltage of the noise signal Vf 1.
Specifically, in a specific implementation, in the common voltage compensation circuit provided in the embodiment of the present invention, as shown in fig. 3, the amplifying module 4 may specifically include: an eleventh resistor R11, a twelfth resistor R12, and a differential amplifier N4;
a first end of the eleventh resistor R11 is connected to the inverting module 3 and configured to receive the noise signal V3 output by the inverting module 3, and a second end of the eleventh resistor R11 is connected to a first end of the twelfth resistor R12 and a negative phase input end of the differential amplifier N4, respectively;
the positive phase input end of the differential amplifier N4 is used for receiving a common voltage signal Vcom, and the output end of the differential amplifier N4 is connected with the signal output end Vout and used for providing the compensated common voltage signal to the signal output end Vout;
a second terminal of the twelfth resistor R12 is connected to the output terminal of the differential amplifier N4.
In specific implementation, in the common voltage compensation circuit provided in the embodiment of the present invention, the common voltage signal Vcom is input to the positive phase input terminal of the differential amplifier, the inverted noise signal V3 is input to the negative phase input terminal of the differential amplifier, and the voltage V of the compensated common voltage signal Vcomout output by the differential amplifier is output by the differential amplifiercomoutComprises the following steps:
wherein, VcomVoltage, r, representing a common voltage signal Vcom8、r9、r11And r12Respectively represent the resistance values of the eighth resistor R8, the ninth resistor R9, the eleventh resistor R11 and the twelfth resistor R12.
In a specific implementation, the resistance of the twelfth resistor may be greater than that of the eleventh resistor, so that the common voltage V may be enabledcomAmplification is performed.
To further couple the common voltage VcomWhen the amplification is performed, the common voltage compensation circuit provided in the embodiment of the present invention may further include: a fourth operational amplifier, a thirteenth resistor, a fourteenth resistor, and a fifteenth resistor; the first end of the thirteenth resistor is used for receiving the common voltage signal, and the second end of the thirteenth resistor is connected with the non-inverting input end of the fourth operational amplifier. The negative phase input end of the fourth operational amplifier is connected with the first end of the fourteenth resistor and the first end of the fifteenth resistor, and the output end of the fourth operational amplifier is respectively connected with the second end of the fifteenth resistor and the positive phase input end of the differential amplifier. A second end of the fourteenth resistor is connected to the ground terminal.
In a specific implementation, the fourth operational amplifier, the thirteenth resistor, the fourteenth resistor and the fifteenth resistor cooperate with each other to amplify the voltage of the input common voltage signal and provide the amplified voltage to the differential amplifier.
In practical applications, specific values of the resistance values of the resistors need to be designed and determined according to practical application environments, and are not limited herein.
In a specific implementation, the specific structures of the operational amplifiers and the differential amplifiers may also be the same as those in the prior art, and are not described herein again.
The above is merely an example of the specific structure of each module in the common voltage compensation circuit provided in the embodiment of the present invention, and in the implementation, the specific structure of each module is not limited to the structure provided in the embodiment of the present invention, and may be other structures known to those skilled in the art, and is not limited herein.
The following describes in detail the operation process of the common voltage compensation circuit provided in the embodiment of the present invention, taking the specific structure of the common voltage compensation circuit shown in fig. 3 as an example.
The feedback signal Vf is input into the filter capacitor C1, and is filtered by the filter capacitor C1, so as to obtain a noise signal Vf1 in the feedback signal Vf. The bootstrap high input impedance circuit composed of the first to seventh resistors R1 to R7, the first operational amplifier N1 and the second operational amplifier N2 receives the noise signal Vf1 without voltage loss. The first operational amplifier N1 amplifies the noise signal Vf1 to generate an amplified noise signal V1, wherein,
the amplified noise signal V1 is input to the negative input terminal of the third operational amplifier N3 through the eighth resistor R8, and the noise signal V1 is inverted by the third operational amplifier N3 to generate an inverted noise signal V3, wherein,
wherein V3Representing the voltage of the inverted noise signal V3. From the above formula, the voltage V of the noise signal V3 after inversion3With the voltage V of the noise signal Vf1f1Are the same as the symbols in (a).
The inverted noise signal V3 is input to the negative input terminal of the differential amplifier N4 through the eleventh resistor R11, the common voltage signal Vcom is input to the positive input terminal of the differential amplifier N4, and the voltage V of the compensated common voltage signal Vcomout output by the differential amplifier N4comoutComprises the following steps:
wherein the content of the first and second substances,
is originalCommon voltage VcomThe magnification of (a) is higher than the magnification of (b),
voltage V being noise signal Vf1f1The magnification of (1). Then, the voltage V of the compensated common voltage signal Vcomout can be known from the above formulacomoutTo be at the original common voltage VcomThe voltage V of the noise signal Vf1 is removedf1Thereby realizing the common voltage VcomCompensation of (2).
In the common voltage compensation circuit provided in the embodiment of the present invention, the first to seventh resistors R1 to R7, the first operational amplifier N1, and the second operational amplifier N2 form a bootstrap high input impedance circuit, so that a noise signal in a feedback signal can be input into the common voltage compensation circuit without voltage loss, thereby improving a compensation effect. In addition, the differential amplifier has the characteristic of inhibiting common mode interference and can effectively work at an operating point, so that the compensation effect on the common voltage can be improved on the basis of not reducing the common mode rejection ratio.
Based on the same inventive concept, an embodiment of the present invention further provides a compensation method for the common voltage compensation circuit, as shown in fig. 4, which specifically includes the following steps:
s401, the filtering module receives the feedback signal, filters the feedback signal to obtain a noise signal, and provides the noise signal to the high-impedance input module;
s402, the high-impedance input module receives a noise signal without voltage loss, amplifies the received noise signal and provides the amplified noise signal to the phase inversion module;
s403, the phase inversion module inverts the noise signal output by the high-impedance input module and provides the inverted noise signal to the amplification module;
s404, the amplifying module generates a compensated common voltage signal according to the noise signal and the common voltage signal output by the inverting module, and provides the compensated common voltage signal to the signal output end.
The compensation method provided by the embodiment of the invention can realize the input high-impedance input module without voltage loss of the noise signal in the feedback signal, and can be matched with other modules to compensate the common voltage signal according to the received noise signal, thereby improving the compensation precision. .
Based on the same inventive concept, the embodiment of the invention also provides a display panel, which comprises the common voltage compensation circuit provided by the embodiment of the invention. Since the principle of the display panel to solve the problem is similar to that of the common voltage compensation circuit, the implementation of the display panel can be referred to the implementation of the common voltage compensation circuit, and the repeated points are not repeated herein.
In a specific implementation, the display panel provided by the embodiment of the invention may be an LCD display panel. At this time, the LCD display panel includes: the liquid crystal display panel comprises an array substrate, an opposite substrate and a liquid crystal layer, wherein the array substrate and the opposite substrate are oppositely arranged, and the liquid crystal layer is packaged between the array substrate and the opposite substrate. In practical applications, the common electrode may be located on the array substrate or the opposite substrate, and is not limited herein.
Based on the same inventive concept, the embodiment of the invention further provides a display device, which comprises the display panel provided by the embodiment of the invention. The implementation of the display device can refer to the above embodiments of the common voltage compensation circuit, and repeated descriptions are omitted.
In specific implementation, the display device provided in the embodiment of the present invention may further include a driving chip for generating a common voltage. The common voltage compensation circuit can be arranged in the driving chip to improve the integration level of the circuit. In practical applications, the driving chip may be disposed on a Printed Circuit Board (PCB).
In specific implementation, the display device provided in the embodiment of the present invention may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the invention.
The embodiment of the invention provides a common voltage compensation circuit, a compensation method thereof, a display panel and a display device, which comprise: the device comprises a filtering module, a high-impedance input module, an inverting module and an amplifying module; the filtering module receives a feedback signal, filters the feedback signal to obtain a noise signal, and provides the noise signal to the high-impedance input module; the high-impedance input module receives a noise signal without voltage loss, amplifies the received noise signal and provides the amplified noise signal to the phase inversion module; the inverting module inverts the received noise signal and provides the inverted noise signal to the amplifying module; and finally, the amplifying module generates a compensated common voltage signal according to the noise signal and the common voltage signal output by the inverting module and provides the compensated common voltage signal to the signal output end. Therefore, the noise signal in the feedback signal is input into the high-impedance input module without voltage loss and is matched with other modules, the common voltage signal can be compensated according to the received noise signal, and the compensation precision is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A common voltage compensation circuit, comprising: the device comprises a filtering module, a high-impedance input module, an inverting module and an amplifying module; wherein the content of the first and second substances,
the filtering module is used for receiving a feedback signal, filtering the feedback signal to obtain a noise signal and providing the noise signal to the high-impedance input module;
the high impedance input module is used for receiving the noise signal without voltage loss, amplifying the received noise signal and providing the amplified noise signal to the phase inversion module;
the inverting module is used for inverting the noise signal output by the high-impedance input module and then providing the inverted noise signal to the amplifying module;
the amplifying module is used for generating a compensated common voltage signal according to the noise signal and the common voltage signal output by the inverting module and providing the compensated common voltage signal to a signal output end;
the inversion module includes: an eighth resistor, a ninth resistor, a tenth resistor, and a third operational amplifier; wherein the content of the first and second substances,
a first end of the eighth resistor is connected with the high-impedance input module and used for receiving the noise signal output by the high-impedance input module, and a second end of the eighth resistor is respectively connected with a first end of the ninth resistor and a negative phase input end of the third operational amplifier;
a positive phase input end of the third operational amplifier is connected with a first end of the tenth resistor, and an output end of the third operational amplifier is connected with the amplifying module and used for providing the noise signal after phase inversion to the amplifying module;
a second end of the ninth resistor is connected with an output end of the third operational amplifier;
and the second end of the tenth resistor is connected with the ground terminal.
2. The common voltage compensation circuit of claim 1, wherein the high impedance input module comprises: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first operational amplifier and a second operational amplifier; wherein the content of the first and second substances,
the first end of the first resistor is connected with the filtering module and used for receiving the noise signal output by the filtering module, and the second end of the first resistor is respectively connected with the first end of the second resistor and the negative phase input end of the first operational amplifier;
the positive phase input end of the first operational amplifier is connected with the first end of the third resistor, and the output end of the first operational amplifier is connected with the inverting module and used for providing the amplified noise signal to the inverting module;
a negative phase input end of the second operational amplifier is connected with a first end of the fourth resistor and a first end of the fifth resistor respectively, a positive phase input end of the second operational amplifier is connected with a first end of the sixth resistor, and an output end of the second operational amplifier is connected with a second end of the fifth resistor and a first end of the seventh resistor respectively;
the second end of the second resistor is respectively connected with the second end of the fourth resistor and the output end of the first operational amplifier;
the second end of the third resistor and the second end of the sixth resistor are both connected with a ground terminal;
and the second end of the seventh resistor is connected with the first end of the first resistor.
3. The common voltage compensation circuit as claimed in claim 2, wherein the first resistor has a resistance equal to that of the seventh resistor, the second resistor has a resistance equal to that of the fourth resistor, and the fifth resistor has a resistance 2 times greater than that of the first resistor.
4. The common voltage compensation circuit of claim 2, wherein the second resistor has a resistance value greater than that of the first resistor.
5. The common voltage compensation circuit of claim 1, wherein the filtering module comprises: a filter capacitor;
and the first end of the filter capacitor is used for receiving the feedback signal, and the second end of the filter capacitor is connected with the high-impedance input module and used for outputting the filtered noise signal.
6. The common voltage compensation circuit of claim 1, wherein the amplification module comprises: an eleventh resistor, a twelfth resistor, and a differential amplifier; wherein the content of the first and second substances,
a first end of the eleventh resistor is connected to the inverting module and configured to receive the noise signal output by the inverting module, and a second end of the eleventh resistor is connected to a first end of the twelfth resistor and a negative-phase input end of the differential amplifier, respectively;
the positive phase input end of the differential amplifier is used for receiving the common voltage signal, and the output end of the differential amplifier is connected with the signal output end and used for providing the compensated common voltage signal to the signal output end;
and the second end of the twelfth resistor is connected with the output end of the differential amplifier.
7. A display panel, comprising: a common voltage compensation circuit as claimed in any one of claims 1 to 6.
8. A display device, comprising: the display panel of claim 7.
9. A compensation method of a common voltage compensation circuit according to any one of claims 1 to 6, comprising:
the filtering module receives the feedback signal, filters the feedback signal to obtain the noise signal, and provides the noise signal to the high-impedance input module;
the high-impedance input module receives the noise signal without voltage loss, amplifies the received noise signal and provides the amplified noise signal to the phase inversion module;
the phase inversion module inverts the noise signal output by the high impedance input module and provides the inverted noise signal to the amplification module;
the amplifying module generates a compensated common voltage signal according to the noise signal and the common voltage signal output by the inverting module, and provides the compensated common voltage signal to the signal output end.
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| CN111640404B (en) * | 2020-06-10 | 2022-06-14 | 昆山龙腾光电股份有限公司 | Wide-narrow viewing angle switching circuit and display device thereof |
| CN114267309B (en) * | 2021-12-25 | 2023-03-10 | 重庆惠科金渝光电科技有限公司 | Public voltage detection circuit, display module and display device |
| CN115622579A (en) * | 2022-11-08 | 2023-01-17 | 杭州地芯科技有限公司 | Open-loop compensation circuit based on phase inverter operational amplifier, receiver and radio frequency transceiver |
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