CN1588191A - Reference voltage driving circuit with compensating circuit and its compensating method - Google Patents
Reference voltage driving circuit with compensating circuit and its compensating method Download PDFInfo
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- CN1588191A CN1588191A CN 200410077889 CN200410077889A CN1588191A CN 1588191 A CN1588191 A CN 1588191A CN 200410077889 CN200410077889 CN 200410077889 CN 200410077889 A CN200410077889 A CN 200410077889A CN 1588191 A CN1588191 A CN 1588191A
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- 239000003990 capacitor Substances 0.000 description 28
- 238000006243 chemical reaction Methods 0.000 description 10
- 239000011159 matrix material Substances 0.000 description 10
- 239000004973 liquid crystal related substance Substances 0.000 description 9
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- 239000010409 thin film Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 230000003412 degenerative effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005499 laser crystallization Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 1
- 230000008713 feedback mechanism Effects 0.000 description 1
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Abstract
The invention is a voltage reference drive circuit with compensating circuit and its compensating method, where the voltage reference compensating circuit is coupled to an operational amplifier in the voltage reference drive circuit and a voltage reference is inputted into the display panel through the operational amplifier. The compensating circuit includes a first capacitance, a second capacitance and a first switch, where the first capacitance stores a potential of the voltage reference, the second capacitance is coupled to the operational amplifier to store the voltage difference between the input and output ends of the operational amplifier, and the first switch is connected with the two capacitances. As the first switch is turn-on, the potentials stored in the two capacitances are added to the operational amplifier to make the operational amplifier output a potential substantially equal to the voltage reference.
Description
Technical field
The invention relates to a kind of LCD (Liquid Crystal Display that is used for, LCD) reference voltage driving circuit (gray scale display reference voltagecircuit) and the How It Works thereof of GTG demonstration, especially a kind of have a compensating circuit, to eliminate fabrication errors for the reference voltage driving circuit of the influence of reference voltage and the method for compensation thereof.
Background technology
(Active Matrix Liquid Crystal Display AMLCD) is the light transmittance that utilizes the electric field controls liquid crystal, to reach the purpose of display frame to active matrix liquid crystal display.Please refer to shown in Figure 1A, a typical active-matrix formula LCD 1 comprises a display panels 10 and a drive system 20.Has a PEL matrix 12 on the display panels 10.Each pixel 120 in this PEL matrix 12 has a liquid crystal capacitance 122 and a thin film transistor (TFT) 124 respectively.Wherein, liquid crystal capacitance 122 is made of with a liquid crystal layer a pixel capacitors (pixel electrode), community electrode (common electrode).Pixel capacitors and common interelectrode potential difference (PD) are the transmittances that has determined liquid crystal layer.And thin film transistor (TFT) 124 is to be connected to pixel capacitors, uses an on-off element as and whether feeds pixel capacitors with decision pixel voltage (pixel voltage).
Drive system 20 comprises a control circuit 22, one source pole driving circuit (source driver) 24 and scan driving circuit (scanning driver) 26.Wherein, control circuit 22 provide digital displaying data (digital display data, DD) with control signal (controlsignal, CS) to source electrode drive circuit 24, simultaneously, (Scanning Signal is SS) to scan drive circuit 26 also to provide sweep signal.Please refer to Figure 1B simultaneously, source electrode drive circuit 24 comprises a latch circuit (latch circuit) 246, a plurality of D/A conversion circuit (Digital to AnalogConverter, DAC) 242 and one reference voltage driving circuit (reference voltage drivingcircuit) 244.Wherein, latch circuit 246 is according to the defined scanning sequence of control signal CS (scanning sequence), bolt-lock digital displaying data DD, and the video data behind the bolt-lock seen through D/A conversion circuit 242, be converted to source drive voltage Vs, import thin film transistor (TFT) 124 in the PEL matrix 12 line by line via data line 32.Scan drive circuit 26 is that this sweep signal SS is converted in the turntable driving voltage Vg input pixel array 12, to see through sweep trace 34 by the thin film transistor (TFT) 124 in the row unlatching PEL matrix 12.
Because the height of the voltage level of source drive voltage Vs is the luminosity that directly has influence on corresponding pixel.Therefore, for the video data DD that makes numeral can accurately be converted to picture signal, must see through reference voltage driving circuit 244 provides each pixel to correspond to the reference voltage level of different GTG brightness.Whereby, the reference voltage level that provided according to this reference voltage driving circuit 244 is provided source electrode drive circuit 24, and video data DD accurately is converted to source drive voltage Vs.Otherwise,, promptly can influence the correctness that picture shows if the reference voltage level that reference voltage driving circuit 244 is provided can't correspond to desirable an ancient woman's ornament Maqu line (gamma curve).
Please refer to shown in Figure 2ly, is the circuit diagram of an exemplary reference Voltag driving circuit 244.This reference voltage driving circuit 244 is to be main body with a resistance string (by a plurality of resistance R 0, the R1...Rk serial connection forms).One end ground connection GND of this resistance string, the other end are connected to a voltage source (not icon) to feed a voltage level VCC.And, in adjacent two resistance R 0, between R1...Rk, having an output node P0 respectively, P1...Pk so that the reference voltage level of a plurality of not coordination standards to be provided, corresponds to the different GTG brightness of each pixel.Please refer to simultaneously shown in Figure 1B, aforementioned each output node P0, the reference voltage level that P1...Pk provided is in the direct feed-in D/A conversion circuit 242.That is to say that each D/A conversion circuit 242 is to see through these output nodes P0, P1...Pk connects resistance string so far.Therefore, the resistance value of each D/A conversion circuit 242 will be to each output node P0, and the voltage level of P1...Pk impacts.In order to reduce the influence of D/A conversion circuit 242 for reference voltage level, normally at output node P0,242 of P1...Pk and D/A conversion circuits are connected in series the degenerative operational amplifier of a tool (operation amplifier, OA) OA0, OA1...OAk is as buffer circuit.
Yet, these are connected in series the operational amplifier OA0 to resistance string, and OA1...OAk also can cause output node P1, the voltage level of P2...Pk with in fact by operational amplifier OA0, the output terminal of OA1...OAk provides to the reference voltage of D/A conversion circuit 242 and produces deviation.For example, as shown in Figure 3, suppose that gain (gain) multiple that operational amplifier OAi is provided is g, and the reference voltage level that resistance string provided is Vin.Through the running of operational amplifier OAi, the magnitude of voltage Vout that output terminal provided is equivalent to Vin (g/ (1+g)).That is to say that the negative feedback mechanism of operational amplifier OAi has caused the deviation of Vin (1/ (1+g)) for the voltage level Vin of reference voltage level.
Generally speaking, in order to reduce this deviation, the most direct method is to improve the pressure reduction of VDD and VSS in the operational amplifier.Yet, along with display panels now develops towards the direction of low-voltage and low power consuming gradually, improve in the operational amplifier way of pressure reduction between VDD and VSS, obviously developing goal is inconsistent therewith.
On the other hand, along with the progress of semiconductor fabrication techniques, the especially exploitation of laser crystallization low temperature polycrystalline silicon manufacturing technologies such as (lasercrystallization) makes that making polycrystalline SiTFT on glass substrate becomes possibility.Therefore, one of development priority of current display panels, be towards drive system is integrated on the display panels (System on Glass just, SOG), to reduce the dimension and weight of LCD.Yet current low temperature polycrystalline silicon manufacturing technology still can't make the operational amplifier that is made on the glass substrate that good consistance is arranged.Therefore, if the reference voltage driving circuit 244 of Fig. 2 is made on the glass substrate, each operational amplifier OA1 between the output voltage and input voltage of OA2...OAk, will produce the deviation that can not expect.
So, how to overcome aforementioned because of the attended operation amplifier to resistance string, and the deviation that causes reference voltage level to produce, simultaneously, get rid of the low temperature polycrystalline silicon processing procedure to the variation that each operational amplifier caused, become in the LCD circuit design a considerable effort target.
Summary of the invention
Fundamental purpose of the present invention is at traditional reference voltage driving circuit, because of connecting the degenerative operational amplifier of tool, and causes reference voltage level to produce the problem of deviation, proposes the method for a solution.
Another object of the present invention is when being made in each operational amplifier on the glass substrate, because of the low temperature polycrystalline silicon processing procedure, to the variation that each operational amplifier caused, proposes a kind of method of solution.
The invention provides the compensating circuit of a compensate for reference voltage, be coupled to the operational amplifier in the reference voltage driving circuit, and this reference voltage is to see through this operational amplifier input display panel.This compensating circuit comprises one first electric capacity, one second electric capacity and one first switch.Wherein, first electric capacity is in order to store the voltage level of this reference voltage.Second electric capacity is to be coupled to operational amplifier, with the input end that stores this operational amplifier and the pressure reduction of output terminal.First switch is to electrically connect with first electric capacity and second electric capacity.By conducting first switch, make the voltage level addition input operation amplifier of first electric capacity and second electric capacity, so that the voltage level of operational amplifier output equals the voltage level of above-mentioned reference voltage.
The present invention provides a kind of reference voltage driving circuit in addition, it is characterized in that described reference voltage driving circuit comprises at least: two resistance are to be electrically connected at mutually between two different voltage levels, and have a voltage output end between this two resistance; One operational amplifier is to be electrically connected at this voltage output end, and has an input end and output terminal; One first electric capacity is to be coupled to this voltage output end, and is the voltage level that stores this reference voltage; One second electric capacity is to be coupled to this operational amplifier, with the input end that stores this operational amplifier and the cross-pressure of output terminal; One first switch is to be electrically connected at this first electric capacity and this second electric capacity, by this first switch of conducting, makes the voltage level of this first electric capacity and this second electric capacity import this operational amplifier.
According to aforementioned reference voltage compensating circuit of the present invention, compensate for reference voltage method of the present invention as can be known is at first to store in a reference voltage to one first electric capacity of input operation amplifier.The cross-pressure that stores the input end of this operational amplifier and output terminal then is in second electric capacity.Subsequently, with this reference voltage and cross-pressure input operation amplifier, so that the voltage level substantial equivalence of operational amplifier output is in above-mentioned reference voltage.
Description of drawings
Figure 1A is the calcspar of a typical active-matrix formula LCD;
Figure 1B is the calcspar of a typical source electrode drive circuit;
Fig. 2 is the circuit diagram of an exemplary reference Voltag driving circuit;
Fig. 3 shows the degenerative operational amplifier of a tool, the difference of its input voltage signal and output voltage signal;
Fig. 4 is the circuit diagram of reference voltage driving circuit one preferred embodiment of the present invention;
It is preferable that Fig. 5 A and Fig. 5 B are that the reference voltage compensating circuit of Fig. 3 carries out the process one of voltage compensation
The circuit diagram of embodiment;
Before Fig. 6 A is reference voltage compensating circuit compensation of the present invention, the oscillogram of the output signal of operational amplifier;
After Fig. 6 B is reference voltage compensating circuit compensation of the present invention, the oscillogram of the output signal of operational amplifier.
Symbol description:
Active-matrix formula LCD～1 display panels～10
Drive system～20 PEL matrix～12
Source electrode drive circuit～24 scan drive circuits～26
Control circuit～22 data lines～32
Sweep trace～34 pixels～120
Liquid crystal capacitance～122 thin film transistor (TFT)s～124
D/A conversion circuit～242 reference voltage driving circuits～244
Latch circuit～246 reference voltage compensating circuit～300
Embodiment
Please refer to shown in Figure 4ly, is the circuit diagram of reference voltage driving circuit one preferred embodiment of the present invention.As shown in FIG., this reference voltage driving circuit comprises a plurality of resistance R 0, R1...Rk, a plurality of operational amplifier OA0, OA1...OAk and a plurality of reference voltage compensating circuit 300.Wherein, a plurality of resistance R 0, R1...Rk is mutual serial connection, to constitute a resistance string.One end ground connection GND of this resistance string, the other end are connected to a voltage source (not icon) obtaining a voltage level VCC, and make the two ends of this resistance string have different voltage level.In addition, adjacent two resistance R 0 in resistance string between R1...Rk, have an output node P0 respectively, and P1...Pk so that a plurality of different reference voltage levels to be provided, corresponds to different GTG brightness.
(i=0～k) is electrically connected with an operational amplifier OAi (i=0～k) to each voltage output end Pi.And (i=0～k) is to have negative feedback to each operational amplifier OAi, with the influence of isolated D/A conversion circuit (please simultaneously with reference to shown in Figure 1B) for reference voltage driving circuit.
Each reference voltage compensating circuit 300 is a respectively corresponding operational amplifier OAi (i=0～k), and comprise one first capacitor C 1, one second capacitor C 2, one first switch SW 1, a second switch SW2, one the 3rd switch SW 3 and one the 4th switch SW 4.Wherein, the first end X1 of first capacitor C 1 is electrically connected to corresponding voltage input end Pi (i=0～k), and the second end X2 is ground connection GND.Therefore, first capacitor C 1 is that voltage input end Pi (voltage level of i=0～k) provided, the just corresponding operational amplifier OAi (voltage level of input end Z1 of i=0～k) are provided.Second capacitor C 2 is to be coupled to operational amplifier OAi (i=0～k).Furthermore, the first end Y1 of second capacitor C 2 is electrically connected to operational amplifier OAi (the input end Z1 of i=0～k), the second end Y2 is electrically connected to operational amplifier OAi (the output terminal Z2 of i=0～k) is with the store operation amplifier OAi (pressure reduction of input end Z1 of i=0～k) and output terminal Z2.
One end of first switch SW 1 is the first end X1 that is electrically connected to first capacitor C 1, and the other end is the second end Y2 that is electrically connected to second capacitor C 2, and first switch SW 1 and first capacitor C 1 and second capacitor C 2 are electrically connected.One end of the 3rd switch SW 3 is to be electrically connected to voltage input end Pi (i=0～k), the other end is to be electrically connected to operational amplifier OAi (i=0～input end Z1 k) and the first end Y1 of second capacitor C 2 simultaneously.Therefore, the 3rd switch SW 3 not only is electrically connected to second capacitor C 2 and voltage input end Pi (i=0～k) simultaneously, also is electrically connected to voltage input end Pi (i=0～k) and operational amplifier OAi (the input end Z1 of i=0～k).
The end of second switch SW2 is the first end X1 that is electrically connected to first capacitor C 1, and the other end is to be electrically connected to the 3rd switch SW 3 and operational amplifier OAi (on the circuit between the input end Z1 of i=0～k).Therefore, second switch SW2 not only is electrically connected to first capacitor C 1 and operational amplifier OAi (the input end Z1 of i=0～k) also is electrically connected to first capacitor C 1 and the 3rd switch SW 3 simultaneously.One end of the 4th switch SW 4 is the second end Y2 and first switch SW 1 that are electrically connected to second capacitor C 2 simultaneously, and the other end is to be electrically connected to operational amplifier OAi (the output terminal Z2 of i=0～k).Therefore, the 4th switch SW 4 is to be electrically connected to second capacitor C 2 and operational amplifier OAi (the output terminal Z2 of i=0～k).
Please refer to shown in Fig. 5 A and Fig. 5 B displayed map 4 reference voltage compensating circuits 300 of the present invention, the preferred embodiment that the voltage level of the reference voltage of voltage input end Pi is compensated.At first, shown in Fig. 5 A, first switch SW 1 is formed opens circuit and second switch SW2 and 3 conductings of the 3rd switch SW, with the voltage level of storage reference voltage in first capacitor C 1.Simultaneously, make 4 conductings of the 4th switch SW, with the cross-pressure that stores this operational amplifier OAi input end Z1 and output terminal Z2 in second capacitor C 2.
Subsequently, shown in Fig. 5 B, the 3rd switch SW 3 is formed open circuit, open circuit so that form between the input end Z1 of this operational amplifier OAi and voltage input end Pi.Simultaneously, 1 conducting of first switch SW and second switch SW2 and the 4th switch SW 4 are formed to open circuit, so that the input end Z1 of the voltage level addition input operation amplifier OAi of first capacitor C 1 and second capacitor C 2, and replace originally the voltage level of the reference voltage that is provided by voltage input end Pi.
It should be noted that, in Fig. 5 B, the voltage level of input operation amplifier OAi input end Z1 is that reference voltage (being stored in first capacitor C 1) that essence is equivalent to voltage input end Pi adds the pressure reduction (being stored in second capacitor C 2) between operational amplifier OAi input end Z1 and output terminal Z2.In other words, the input voltage of operational amplifier OAi and the deviation of output voltage are that over-compensation is proofreaied and correct, and provide again to operational amplifier OAi.Also therefore, the voltage level of the voltage level of the operational amplifier OAi output terminal Z2 of Fig. 5 B reference voltage that to be substantial equivalence provided in voltage output end Pi.
Please refer to shown in Fig. 6 A and Fig. 6 B, show reference voltage compensating circuit 300 of the present invention, for the improvement of the signal output waveform of operational amplifier OAi output terminal Z2.Under the situation that not enabled reference voltage compensating circuit 300 compensates, as shown in Figure 6A, between the voltage level OUT of the voltage level REF of the reference voltage that voltage output end Pi is provided and the output terminal Z2 of operational amplifier OAi, there is a deviate.And as described in the prior art, this deviate is the gain multiple that comes from operational amplifier OAi self, and the variation that this operational amplifier OAi is caused of low temperature polycrystalline silicon processing procedure.Simultaneously, this error amount is to be equivalent among Fig. 5 A, is stored in operational amplifier OAi input end Z1 in second capacitor C 2 and the pressure reduction between output terminal Z2.
Shown in Fig. 6 B, after reference voltage compensating circuit 300 compensation of the present invention, the waveform of the voltage level OUT ' of operational amplifier OAi output terminal Z2, be to divide into former and later two part a with different voltage levels and b, correspond to the state of reference voltage compensating circuit 300 respectively at Fig. 5 A and Fig. 5 B.Wherein, the voltage level of the forward part a of this waveform is to be equivalent among Fig. 6 A, the voltage level OUT of the operational amplifier OAi output terminal Z2 of not compensated.And the voltage level of the rear section b of this waveform (just corresponding to Fig. 5 B) through compensated voltage position standard, the voltage level REF of the reference voltage that to be substantial equivalence provided in voltage output end Pi.
Basically, reference voltage driving circuit 300 provides each pixel and corresponds to the required reference voltage level of different GTG brightness, and this reference voltage level must be quite accurate, can guarantee that each pixel can present correct GTG brightness.Shown in Fig. 6 B, waveform through reference voltage compensating circuit 300 compensated voltage position standards of the present invention, though have the part a and the b of former and later two different voltage levels, but the voltage level of its posterior part b is that the voltage level REF essence of the reference voltage that provided with voltage output end Pi is identical.Therefore, source electrode drive circuit (as shown in Figure 2) is can be according to the voltage level of this rear section b, and changing out video data DD accurately, source drive voltage Vs shows to drive pixel.
Hence one can see that, compared to conventional art, utilizes the gain multiple that improves operational amplifier to reduce the influence of operational amplifier for the voltage level of reference voltage.Shown in Fig. 5 B, reference voltage compensating circuit 300 provided by the present invention is the direct feedbacks of pressure reduction with input end Z1 and the output terminal Z2 of operational amplifier OAi, and does not concern with operational amplifier OAi gain height.Also therefore, the present invention is also applicable to the operational amplifier of low gain multiple.In addition, the compensation method of reference voltage compensating circuit 300 of the present invention, also it doesn't matter with the gain multiple size of each operational amplifier OAi.Therefore, even cause the gain multiple of each operational amplifier OAi to be had nothing in common with each other because of the low temperature polycrystalline silicon processing procedure, also can see through reference voltage compensating circuit 300 of the present invention, respectively each operational amplifier OAi is compensated automatically, export reference voltage level accurately to guarantee reference voltage driving circuit.
Claims (12)
1, a kind of compensating circuit of compensate for reference voltage is characterized in that described compensating circuit is to be coupled to an operational amplifier with an input end and an output terminal, comprising:
One first electric capacity is the voltage level that stores this reference voltage;
One second electric capacity is to couple this operational amplifier;
One first switch is to be electrically connected at this first electric capacity and this second electric capacity, and by this first switch of conducting, the voltage level that makes this first electric capacity and this second electric capacity is this operational amplifier of input.
2, the compensating circuit of compensate for reference voltage according to claim 1 is characterized in that: this second electric capacity is to store the input end of this operational amplifier and the cross-pressure of output terminal.
3, the compensating circuit of compensate for reference voltage according to claim 1, it is characterized in that: more comprise a second switch, be electrically connected to the input end of this first electric capacity and this operational amplifier, by being formed, this first switch opens circuit and this second switch conducting, so that the voltage level of this reference voltage is stored in this first electric capacity, and by being formed, this first switch conduction and this second switch open circuit, so that this operational amplifier is imported in the voltage level addition of this first electric capacity and this second electric capacity.
4, the compensating circuit of compensate for reference voltage according to claim 1 is characterized in that: more comprise:
One the 3rd switch is electrically connected to the input end of this second electric capacity and this operational amplifier;
One the 4th switch is electrically connected to the output terminal of this second electric capacity and this operational amplifier;
By being formed, this first switch opens circuit and the 3rd switch and the 4th switch conduction, so that the pressure reduction of this operational amplifier input end and output terminal is stored in this second electric capacity, and by being formed, this first switch conduction and the 3rd switch and the 4th switch open circuit, so that this operational amplifier is imported in the voltage level addition of this first electric capacity and this second electric capacity.
5, the compensating circuit of compensate for reference voltage according to claim 1, it is characterized in that: by making the stored voltage level of this first electric capacity and this second electric capacity input to this operational amplifier, so that the voltage level substantial equivalence of this operational amplifier output is in this reference voltage.
6, a kind of reference voltage driving circuit is characterized in that described reference voltage driving circuit comprises at least:
Two resistance are to be electrically connected at mutually between two different voltage levels, and have a voltage output end between this two resistance;
One operational amplifier is to be electrically connected at this voltage output end, and has an input end and output terminal;
One first electric capacity is to be coupled to this voltage output end, and is the voltage level that stores this reference voltage;
One second electric capacity is to be coupled to this operational amplifier, with the input end that stores this operational amplifier and the cross-pressure of output terminal;
One first switch is to be electrically connected at this first electric capacity and this second electric capacity, by this first switch of conducting, makes the voltage level of this first electric capacity and this second electric capacity import this operational amplifier.
7, reference voltage driving circuit according to claim 6, it is characterized in that: comprise that more a second switch is electrically connected to the input end of this first electric capacity and this operational amplifier, by being formed, this first switch opens circuit and this second switch conducting, so that the voltage level of this reference voltage is stored in this first electric capacity, and by being formed, this first switch conduction and this second switch open circuit, so that this operational amplifier is imported in the voltage level addition of this first electric capacity and this second electric capacity.
8, reference voltage driving circuit according to claim 6 is characterized in that described reference voltage driving circuit more comprises:
One the 3rd switch is electrically connected to the input end of this second electric capacity and this operational amplifier;
One the 4th switch is electrically connected to the output terminal of this second electric capacity and this operational amplifier;
By being formed, this first switch opens circuit and the 3rd switch and the 4th switch conduction, so that in this second electric capacity that the pressure reduction of this operational amplifier input end and output terminal is stored in, and by being formed, this first switch conduction and the 3rd switch and the 4th switch open circuit, so that this operational amplifier is imported in the voltage level addition of this first electric capacity and this second electric capacity.
9, reference voltage driving circuit according to claim 6, it is characterized in that: by making the stored voltage level of this first electric capacity and this second electric capacity input to this operational amplifier, so that the voltage level substantial equivalence of this operational amplifier output is in this reference voltage.
10, a kind of method of compensate for reference Voltag driving circuit, this reference voltage driving circuit comprises two resistance and operational amplifiers that electrically connect mutually at least, and this two resistance is to be electrically connected between two different voltage levels and to have a voltage output end to export a reference voltage, and this operational amplifier is to be electrically connected to this voltage output end, and this method comprises:
Store in reference voltage to one first electric capacity of this voltage output end;
The cross-pressure that stores this operational amplifier input end and output terminal is in one second electric capacity;
This reference voltage and this cross-pressure are imported this operational amplifier, so that the voltage level substantial equivalence of this operational amplifier output is in this reference voltage.
11, the method for compensate for reference Voltag driving circuit according to claim 10, wherein, this first electric capacity and this second electric capacity are to be electrically connected at one first switch, and the input end of this first electric capacity and this operational amplifier is to be electrically connected at a second switch, by being formed, this first switch opens circuit and this second switch conducting, be stored in this first electric capacity with reference voltage with this voltage output end, and, by being formed, this second switch opens circuit and this first switch of conducting, with this operational amplifier this reference voltage and this cross-pressure addition input.
12, the method of compensate for reference Voltag driving circuit according to claim 11, wherein, the input end of this second electric capacity and this operational amplifier is to be electrically connected at one the 3rd switch, and the output terminal of this second electric capacity and this operational amplifier is to be electrically connected at one the 4th switch, by being formed, this first switch opens circuit and the 3rd switch and the 4th switch conduction, with the cross-pressure that stores this operational amplifier input end and output terminal in this second electric capacity, and, by being formed, the 3rd switch and the 4th switch open circuit, so that this reference voltage and this cross-pressure addition are imported this operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410077889XA CN100343732C (en) | 2004-09-16 | 2004-09-16 | Reference voltage driving circuit with compensating circuit and its compensating method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410077889XA CN100343732C (en) | 2004-09-16 | 2004-09-16 | Reference voltage driving circuit with compensating circuit and its compensating method |
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| Publication Number | Publication Date |
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| CN1588191A true CN1588191A (en) | 2005-03-02 |
| CN100343732C CN100343732C (en) | 2007-10-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB200410077889XA Expired - Fee Related CN100343732C (en) | 2004-09-16 | 2004-09-16 | Reference voltage driving circuit with compensating circuit and its compensating method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100461256C (en) * | 2005-08-16 | 2009-02-11 | 爱普生映像元器件有限公司 | Amplifier circuit and display device |
| CN101131807B (en) * | 2006-08-24 | 2010-05-12 | 联咏科技股份有限公司 | Voltage buffer and its source electrode driver |
| CN101551982B (en) * | 2008-04-02 | 2012-02-01 | 奇景光电股份有限公司 | Liquid crystal driving circuit |
| CN102622980A (en) * | 2011-04-08 | 2012-08-01 | 矽创电子股份有限公司 | Driving circuit for display panel |
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| US4707624A (en) * | 1986-09-10 | 1987-11-17 | National Semiconductor Corp. | Offset cancellation scheme for a differential reset stabilized latch |
| JP3998343B2 (en) * | 1998-10-05 | 2007-10-24 | 三菱電機株式会社 | Offset voltage compensation circuit |
| CN1455515A (en) * | 2002-04-30 | 2003-11-12 | 旭宏通讯股份有限公司 | Digital-to-analogue converting apparatus and method |
| JP4269582B2 (en) * | 2002-05-31 | 2009-05-27 | ソニー株式会社 | Liquid crystal display device, control method thereof, and portable terminal |
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- 2004-09-16 CN CNB200410077889XA patent/CN100343732C/en not_active Expired - Fee Related
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| CN100461256C (en) * | 2005-08-16 | 2009-02-11 | 爱普生映像元器件有限公司 | Amplifier circuit and display device |
| CN101131807B (en) * | 2006-08-24 | 2010-05-12 | 联咏科技股份有限公司 | Voltage buffer and its source electrode driver |
| CN101551982B (en) * | 2008-04-02 | 2012-02-01 | 奇景光电股份有限公司 | Liquid crystal driving circuit |
| CN102622980A (en) * | 2011-04-08 | 2012-08-01 | 矽创电子股份有限公司 | Driving circuit for display panel |
| CN105242804A (en) * | 2015-09-21 | 2016-01-13 | 京东方科技集团股份有限公司 | Touch compensation circuit, compensating method for touch compensation circuit, touch screen and display apparatus |
| CN105242804B (en) * | 2015-09-21 | 2017-11-24 | 京东方科技集团股份有限公司 | Touch-control compensation circuit, its compensation method, touch-screen and display device |
| WO2020010910A1 (en) * | 2018-07-09 | 2020-01-16 | 京东方科技集团股份有限公司 | Gamma voltage compensation circuit and compensation method, source driver, and display panel |
| US11341915B2 (en) | 2018-07-09 | 2022-05-24 | Boe Technology Group Co., Ltd. | Gamma voltage compensation circuit and gamma voltage compensation method, source driver, and display panel |
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| CN100343732C (en) | 2007-10-17 |
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