CN106328035A - Common voltage compensating circuit, common voltage compensating method, display panel and display device - Google Patents
Common voltage compensating circuit, common voltage compensating method, display panel and display device Download PDFInfo
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- CN106328035A CN106328035A CN201610711009.2A CN201610711009A CN106328035A CN 106328035 A CN106328035 A CN 106328035A CN 201610711009 A CN201610711009 A CN 201610711009A CN 106328035 A CN106328035 A CN 106328035A
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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
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Abstract
The invention discloses a common voltage compensating circuit, a common voltage compensating method, a display panel and a display device. The common voltage compensating circuit comprises a first amplifying module and a second amplifying module, wherein the first amplifying module is used for amplifying a signal at a common voltage signal end, generating a corresponding amplified voltage signal and transmitting the corresponding amplified voltage signal to the first input end of the second amplifying module. The second amplifying module is used for generating and outputting a corresponding compensating voltage signal according to the amplified voltage signal and the signal at the feedback signal end. The common voltage compensating circuit has advantages of relatively high input impedance and higher flexibility in gain adjustment. The common voltage compensating circuit can realize maximization of output signal-to-noise ratio and improves common mode rejection ratio.
Description
Technical field
The present invention relates to Display Technique field, espespecially a kind of common electric voltage compensate circuit, its compensation method, display floater and
Display device.
Background technology
Common-mode voltage is the meansigma methods of the vectorial voltage occurred between each conductor and reference point of defined, common mode electricity
Pressure can make greatly amplifier depart from linear amplification region to a certain extent, so our common mode disturbances to be suppressed.
For improving picture quality, it is generally required to the public electrode Vcom on display floater (panel) is compensated, and right
Public electrode Vcom is compensated and is typically realized by Vcom compensation circuit.Owing to Vcom compensation circuit can be along with common mode electricity
The interference of pressure, general employing differential input amplifier suppresses, as it is shown in figure 1, specifically, the supply voltage (Vcom) of panel
Be input to operational amplifier (OP) normal phase input end (in Fig. 1 "+" one end), panel feedback signal voltage (Feed_L) input
To the inverting input (one end of "-" in Fig. 1) of operational amplifier, it is then passed through defeated after operational amplifier is amplified processing
Go out terminal voltage (Vcom_O) and be input to panel again, thus weaken the fluctuation of the Vcom voltage of panel own, and then improve panel
Display quality.From figure 1 it appears that amplification k=of operational amplifier (Vcom_O Vcom)/(Feed_L Vcom)
=R0 '/R0.The common mode rejection ratio of the most general operational amplifier is up to 80dB.
The circuit structure of differential input amplifier is simple at present, but input impedance is less, gain-adjusted difficulty so that it is application
Time be limited by very large.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of common electric voltage compensate circuit, its compensation method, display floater and show
Showing device, it is possible to achieve the maximization of output signal-to-noise ratio, improves common mode rejection ratio.
Therefore, embodiments provide a kind of common electric voltage and compensate circuit, including: the first amplification module and second is put
Big module；Wherein,
The first input end of described first amplification module is connected with public voltage signal end, and the second input is with earth terminal even
Connecing, outfan is connected with the first input end of described second amplification module；Described first amplification module is for believing common electric voltage
The signal of number end is amplified processing, and generates and corresponding amplify voltage signal and transmit the first defeated of extremely described second amplification module
Enter end；
The first input end of described second amplification module is connected with feedback signal terminal, and the second input is connected with earth terminal,
Outfan is used for exporting compensation voltage signal；Described second amplification module is for according to described amplification voltage signal and described feedback
The signal of signal end, generates corresponding compensation voltage signal and exports.
In a kind of possible implementation, the above-mentioned common electric voltage provided in the embodiment of the present invention compensates in circuit, institute
State the first amplification module to specifically include: the first operational amplifier, the first resistance, the second resistance and the 3rd resistance；Wherein,
One end of described first resistance is connected with described public voltage signal end, the other end respectively with described second resistance
The negative-phase input of one end and described first operational amplifier connects；
The other end of described second resistance is connected with the outfan of described first operational amplifier；
One end of described 3rd resistance is connected with the normal phase input end of described first operational amplifier, and the other end connects with described
Ground end connects.
In a kind of possible implementation, the above-mentioned common electric voltage provided in the embodiment of the present invention compensates in circuit, institute
State the second amplification module to specifically include: the second operational amplifier, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance,
Eight resistance and electric capacity；Wherein,
One end of described 4th resistance is connected with the outfan of described first amplification module, and the other end is respectively with the described 5th
The negative-phase input of one end of resistance, one end of described 6th resistance and described second operational amplifier connects；
One end of described electric capacity is connected with described feedback signal terminal, and the other end is connected with the other end of described 5th resistance；
The other end of described 6th resistance is connected with the outfan of described second operational amplifier；
One end of described 7th resistance is connected with the normal phase input end of described second operational amplifier, and the other end connects with described
Ground end connects；
One end of described 8th resistance is connected with the outfan of described second operational amplifier, and the other end is used for exporting compensation
Voltage signal.
In a kind of possible implementation, the above-mentioned common electric voltage provided in the embodiment of the present invention compensates in circuit, institute
The resistance stating the 3rd resistance is identical with the resistance after described first resistance and the second resistor coupled in parallel.
In a kind of possible implementation, the above-mentioned common electric voltage provided in the embodiment of the present invention compensates in circuit, institute
The resistance stating the 7th resistance is identical with the resistance after described 4th resistance, the 5th resistance and the 6th resistor coupled in parallel.
The embodiment of the present invention additionally provides the compensation of the above-mentioned common electric voltage compensation circuit that a kind of embodiment of the present invention provides
Method, including:
The signal of public voltage signal end is amplified processing by the first amplification module, generates corresponding amplification voltage signal
And transmit the first input end to described second amplification module；
Second amplification module, according to described amplification voltage signal and the signal of described feedback signal terminal, generates corresponding compensation
Voltage signal also exports.
The embodiment of the present invention additionally provides a kind of display floater, and the above-mentioned common electric voltage provided including the embodiment of the present invention is mended
Repay circuit.
The embodiment of the present invention additionally provides a kind of display device, the above-mentioned display floater provided including the embodiment of the present invention.
The beneficial effect of the embodiment of the present invention includes:
A kind of common electric voltage that the embodiment of the present invention provides compensates circuit, its compensation method, display floater and display device,
It is provided with the first amplification module and the second amplification module in common electric voltage compensates circuit；Wherein, the first of the first amplification module
Input is connected with public voltage signal end, and the second input is connected with earth terminal, outfan and the first of the second amplification module
Input connects；First amplification module, for the signal of public voltage signal end is amplified process, generates corresponding amplification
Voltage signal the first input end transmitted to the second amplification module；The first input end of the second amplification module and feedback signal terminal
Connecting, the second input is connected with earth terminal, and outfan is used for exporting compensation voltage signal；Second amplification module is for according to putting
Big voltage signal and the signal of feedback signal terminal, generate corresponding compensation voltage signal and export.The above-mentioned public affairs that the present invention provides
The input impedance that common voltage compensates circuit is higher, and gain-adjusted is more flexible, it is possible to achieve the maximization of output signal-to-noise ratio, improves
Common mode rejection ratio.
Accompanying drawing explanation
Fig. 1 is the structural representation that in prior art, common electric voltage compensates circuit；
Fig. 2 compensates the structural representation of circuit for the common electric voltage that the embodiment of the present invention provides；
Fig. 3 compensates the concrete structure schematic diagram of circuit for the common electric voltage that the embodiment of the present invention provides；
Fig. 4 compensates the compensation method flow chart of circuit for the common electric voltage that the embodiment of the present invention provides.
Detailed description of the invention
In order to make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing the present invention made into
One step ground describes in detail, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole enforcement
Example.Based on the embodiment in the present invention, those of ordinary skill in the art are obtained under not making creative work premise
All other embodiments, broadly fall into the scope of protection of the invention.
Below in conjunction with the accompanying drawings, the common electric voltage provided the embodiment of the present invention compensates circuit, its compensation method, display floater
And the detailed description of the invention of display device is described in detail.
Embodiments provide a kind of common electric voltage and compensate circuit, as shown in Figures 2 and 3, including: first amplifies mould
Block 1 and the second amplification module 2；Wherein,
The first input end of the first amplification module 1 is connected with public voltage signal end Vcom, the second input and earth terminal
GND connects, and the first input end of outfan and the second amplification module 2 connects；First amplification module 1 is for by public voltage signal
The signal of end Vcom is amplified processing, generate corresponding amplify voltage signal and transmit to the second amplification module 2 first defeated
Enter end；
The first input end of the second amplification module 2 is connected with feedback signal terminal Feed_L, the second input and earth terminal GND
Connecting, outfan is used for exporting compensation voltage signal Vcom_O；Second amplification module 2 is for according to amplifying voltage signal and feedback
The signal of signal end Feed_L, generates corresponding compensation voltage signal Vcom_O and exports.
The above-mentioned common electric voltage provided in the embodiment of the present invention compensates circuit, compensates in circuit at common electric voltage and is provided with the
One amplification module and the second amplification module；Wherein, the first input end of the first amplification module is connected with public voltage signal end, the
Two inputs are connected with earth terminal, and the first input end of outfan and the second amplification module connects；First amplification module is used for will
The signal of public voltage signal end is amplified processing, and generates corresponding amplifying voltage signal and transmit to the second amplification module
First input end；The first input end of the second amplification module is connected with feedback signal terminal, and the second input is connected with earth terminal, defeated
Go out end for exporting compensation voltage signal；Second amplification module is used for according to amplifying voltage signal and the signal of feedback signal terminal,
Generate corresponding compensation voltage signal and export.The above-mentioned common electric voltage that the present invention provides compensates circuit, utilizes the first amplification mould
Cooperating of block and the second amplification module so that it is input impedance is higher, and gain-adjusted is more flexible, it is possible to achieve output noise
The maximization of ratio, improves common mode rejection ratio.
Below in conjunction with specific embodiment, the present invention is described in detail.It should be noted that the present embodiment is in order to
Preferably explain the present invention, but be not intended to the present invention.
In the specific implementation, the above-mentioned common electric voltage provided in the embodiment of the present invention compensates in circuit, as it is shown on figure 3, the
One amplification module 1 specifically may include that the first operational amplifier N1, the first resistance R1, the second resistance R2 and the 3rd resistance R3；Its
In,
One end of first resistance R1 is connected with public voltage signal end Vcom, the other end respectively with one end of the second resistance R2
Connect with the negative-phase input of the first operational amplifier N1；
The other end of the second resistance R2 and the outfan of the first operational amplifier N1 connect；
One end of 3rd resistance R3 is connected with the normal phase input end of the first operational amplifier N1, the other end and earth terminal GND
Connect.
Specifically, as it is shown on figure 3, the signal of public voltage signal end Vcom is amplified place by the first operational amplifier N1
Reason, generates corresponding amplification voltage signal V01And transmit the first input end to described second amplification module 2, now
More than being merely illustrative of the concrete structure of the first amplification module in image element circuit, in the specific implementation, first puts
The concrete structure of big module is not limited to the said structure that the embodiment of the present invention provides, it is also possible to skilled person will appreciate that
Other structures, do not limit at this.
In the specific implementation, the above-mentioned common electric voltage provided in the embodiment of the present invention compensates in circuit, as it is shown on figure 3, the
Two amplification modules 2 specifically may include that the second operational amplifier N2, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6,
Seven resistance R7, the 8th resistance R8 and electric capacity C；Wherein,
One end of 4th resistance R4 is connected with the outfan of the first amplification module 1, and the other end is respectively with the 5th resistance R5's
The negative-phase input of one end, one end of the 6th resistance R6 and the second operational amplifier N2 connects；
One end of electric capacity C is connected with feedback signal terminal Feed_L, and the other end of the other end and the 5th resistance R5 connects；
The other end of the 6th resistance R6 and the outfan of the second operational amplifier N2 connect；
One end of 7th resistance R7 is connected with the normal phase input end of the second operational amplifier N2, and the other end is with earth terminal even
Connect；
One end of 8th resistance R8 is connected with the outfan of the second operational amplifier N2, and the other end is used for exporting compensation voltage
Signal Vcom_O.
Specifically, voltage signal V is amplified01It is input to the negative input of the second operational amplifier, same feedback signal terminal
The signal of Feed_L also enters into the negative input of the second operational amplifier, and then the outfan output of the second operational amplifier
Signal, i.e. compensation voltage signal Vcom_O is
Assume common-mode signalDifference mode signal Vid=Vcom-VFeed_L
Have,
So,
Substitution has
Common mode rejection ratio CMRR has
Being computed, the above-mentioned common electric voltage that the embodiment of the present invention provides compensates the common mode rejection ratio of circuit up to 120dB, phase
Compensating circuit for existing common electric voltage, its common mode rejection ratio improves certain level.
For ideal amplifier, input impedance is infinitely great, and output impedance is zero.But the input of amplifying circuit hinders
Anti-can not be infinitely great, input impedance is the highest, and the noise of input is the biggest, the most not all in the case of be desirable that amplifying circuit
There is high input impedance, but the output signal-to-noise ratio of amplifying circuit should be made to reach with the output matches impedances of input signal
To maximum.
WhenVFeed_L=VcomTime, output obtains zero common-mode voltage gaim, output only difference mode signal, i.e. common mode
Signal is suppressed.
WhenTime,
I.e. haveIt is capable of the Contrary compensation to Vcom feedback, compensates multiple
For
Additionally, capacitance C is 1uF electric capacity, protective resistance R8 is the resistance of 10 Ω.
More than being merely illustrative of the concrete structure of the second amplification module in image element circuit, in the specific implementation, second puts
The concrete structure of big module is not limited to the said structure that the embodiment of the present invention provides, it is also possible to skilled person will appreciate that
Other structures, do not limit at this.
In the specific implementation, the above-mentioned common electric voltage provided in the embodiment of the present invention compensates in circuit, as it is shown on figure 3, be
The symmetrical precision of coupling outer meeting resistance, makes common mode inhibition capacity best, specifically, and the resistance of the 3rd resistance R3 and the first resistance
Resistance after R1 and the second resistance R2 parallel connection could be arranged to identical, i.e. R3=R1 ∥ R2.
Further, in the specific implementation, the above-mentioned common electric voltage provided in the embodiment of the present invention compensates in circuit, in order to
The symmetrical precision of coupling outer meeting resistance, makes common mode inhibition capacity best, the resistance of the 7th resistance R7 and the 4th resistance R4, the 5th electricity
Resistance after resistance R5 and the 6th resistance R6 parallel connection could be arranged to identical, i.e. R7=R4 ∥ R5 ∥ R6.
It should be noted that the above-mentioned common electric voltage compensation circuit requirement outer meeting resistance that the embodiment of the present invention provides is the most flat
Weighing apparatus symmetry, and requires that amplifier has ideal characterisitics, and otherwise amplifier will have common-mode error to export, its size both with external electricity
The symmetrical precision of resistance is correlated with, relevant to the common mode inhibition capacity of amplifier again.
Based on same inventive concept, the embodiment of the present invention additionally provides the above-mentioned common electrical that a kind of embodiment of the present invention provides
Pressure compensates the compensation method of circuit, owing to the principle of the method solution problem is similar to aforementioned a kind of common electric voltage compensation circuit,
Therefore the enforcement of the method may refer to common electric voltage and compensates the enforcement of circuit, repeats no more in place of repetition.
In the specific implementation, the compensation method of the common electric voltage compensation circuit that the embodiment of the present invention provides, as shown in Figure 4,
Specifically include following steps:
The signal of public voltage signal end is amplified processing by S401, the first amplification module, generates corresponding amplification electricity
Pressure signal the first input end transmitted to the second amplification module；
S402, the second amplification module, according to amplifying voltage signal and the signal of feedback signal terminal, generate corresponding compensation electricity
Pressure signal also exports.
The above-mentioned common electric voltage that the embodiment of the present invention provides compensates the compensation method of circuit, it is possible to achieve output signal-to-noise ratio
Maximize, improve common mode rejection ratio.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of display floater, carries including the embodiment of the present invention
The above-mentioned common electric voltage of confession compensates circuit.Owing to this display floater solves the principle of problem and aforementioned a kind of common electric voltage compensation electricity
Road is similar, and therefore the enforcement of the compensation of the common electric voltage in this display floater circuit may refer to common electric voltage compensation in previous examples
The enforcement of circuit, repeats no more in place of repetition.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of display device, carries including the embodiment of the present invention
The above-mentioned display floater of confession, this display device can be: mobile phone, panel computer, television set, display, notebook computer, number
Any product with display function such as photo frame, navigator or parts.Other requisite composition for this display device
Part is and it will be apparent to an ordinarily skilled person in the art that have, and does not repeats at this, also should not be used as the present invention's
Limit.The enforcement of this display device may refer to above-mentioned display floater or the embodiment of common electric voltage compensation circuit, in place of repetition
Repeat no more.
A kind of common electric voltage that the embodiment of the present invention provides compensates circuit, its compensation method, display floater and display device,
Including: the first amplification module and the second amplification module；Wherein, the first input end of the first amplification module and public voltage signal end
Connecting, the second input is connected with earth terminal, and the first input end of outfan and the second amplification module connects；First amplification module
For the signal of public voltage signal end being amplified process, generating corresponding amplification voltage signal and transmitting to the second amplification
The first input end of module；The first input end of the second amplification module is connected with feedback signal terminal, the second input and earth terminal
Connecting, outfan is used for exporting compensation voltage signal；Second amplification module is for according to amplifying voltage signal and feedback signal terminal
Signal, generate corresponding compensation voltage signal and export.The above-mentioned common electric voltage that the present invention provides compensates the input resistance of circuit
Anti-higher, gain-adjusted is more flexible, it is possible to achieve the maximization of output signal-to-noise ratio, improves common mode rejection ratio.
Obviously, those skilled in the art can carry out various change and the modification essence without deviating from the present invention to the present invention
God and scope.So, if these amendments of the present invention and modification belong to the scope of the claims in the present invention and equivalent technologies thereof
Within, then the present invention is also intended to comprise these change and modification.
Claims (8)
1. a common electric voltage compensates circuit, it is characterised in that including: the first amplification module and the second amplification module；Wherein,
The first input end of described first amplification module is connected with public voltage signal end, and the second input is connected with earth terminal,
Outfan is connected with the first input end of described second amplification module；Described first amplification module is for by public voltage signal end
Signal be amplified processing, generate the corresponding voltage signal transmitting to the first of described second amplification module of amplifying and input
End；
The first input end of described second amplification module is connected with feedback signal terminal, and the second input is connected with earth terminal, output
End is used for exporting compensation voltage signal；Described second amplification module is for according to described amplification voltage signal and described feedback signal
The signal of end, generates corresponding compensation voltage signal and exports.
2. common electric voltage as claimed in claim 1 compensates circuit, it is characterised in that described first amplification module specifically includes:
First operational amplifier, the first resistance, the second resistance and the 3rd resistance；Wherein,
One end of described first resistance is connected with described public voltage signal end, the other end respectively with one end of described second resistance
Connect with the negative-phase input of described first operational amplifier；
The other end of described second resistance is connected with the outfan of described first operational amplifier；
One end of described 3rd resistance is connected with the normal phase input end of described first operational amplifier, the other end and described earth terminal
Connect.
3. common electric voltage as claimed in claim 1 compensates circuit, it is characterised in that described second amplification module specifically includes:
Second operational amplifier, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance and electric capacity；Wherein,
One end of described 4th resistance is connected with the outfan of described first amplification module, the other end respectively with described 5th resistance
One end, one end of described 6th resistance and described second operational amplifier negative-phase input connect；
One end of described electric capacity is connected with described feedback signal terminal, and the other end is connected with the other end of described 5th resistance；
The other end of described 6th resistance is connected with the outfan of described second operational amplifier；
One end of described 7th resistance is connected with the normal phase input end of described second operational amplifier, the other end and described earth terminal
Connect；
One end of described 8th resistance is connected with the outfan of described second operational amplifier, and the other end is used for exporting compensation voltage
Signal.
4. common electric voltage as claimed in claim 2 compensates circuit, it is characterised in that the resistance of described 3rd resistance and described the
Resistance after one resistance and the second resistor coupled in parallel is identical.
5. common electric voltage as claimed in claim 3 compensates circuit, it is characterised in that the resistance of described 7th resistance and described the
Resistance after four resistance, the 5th resistance and the 6th resistor coupled in parallel is identical.
6. a common electric voltage as described in any one of claim 1-5 compensates the compensation method of circuit, it is characterised in that including:
The signal of public voltage signal end is amplified processing by the first amplification module, generates corresponding amplification voltage signal and passes
Transport to the first input end of described second amplification module；
Second amplification module, according to described amplification voltage signal and the signal of described feedback signal terminal, generates corresponding compensation voltage
Signal also exports.
7. a display floater, it is characterised in that include that the common electric voltage as described in any one of claim 1-5 compensates circuit.
8. a display device, it is characterised in that include display floater as claimed in claim 7.
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| CN201610711009.2A CN106328035A (en) | 2016-08-23 | 2016-08-23 | Common voltage compensating circuit, common voltage compensating method, display panel and display device |
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| CN201610711009.2A CN106328035A (en) | 2016-08-23 | 2016-08-23 | Common voltage compensating circuit, common voltage compensating method, display panel and display device |
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Application publication date: 20170111 |
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| RJ01 | Rejection of invention patent application after publication |