CN102013235B - TFT-LCD (Thin Film Transistor-Liquid Crystal Display) drive circuit - Google Patents
TFT-LCD (Thin Film Transistor-Liquid Crystal Display) drive circuit Download PDFInfo
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- CN102013235B CN102013235B CN 200910091998 CN200910091998A CN102013235B CN 102013235 B CN102013235 B CN 102013235B CN 200910091998 CN200910091998 CN 200910091998 CN 200910091998 A CN200910091998 A CN 200910091998A CN 102013235 B CN102013235 B CN 102013235B
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Abstract
The invention discloses a TFT-LCD (Thin Film Transistor-Liquid Crystal Display) drive circuit comprising a public electrode signal generating module and a compensating circuit, wherein the public electrode signal generating module is used for generating public electrode signals; the compensating circuit is connected with the public electrode signal generating module and an electrode which is arranged on a panel and is used for receiving the public electrode signals, the compensating circuit is used for compensating the voltage of the electrode used for receiving the public electrode signals so that the voltage of the electrodes for receiving the public electrode signals in different positions on the panel achieves respective target voltage. The TFT-LCD drive circuit can reduce TFT-LCD picture scintillation and residual direct-current components.
Description
Technical field
The present invention relates to the liquid crystal display-driving technology, relate in particular to a kind of Thin Film Transistor-LCD (Thin Film Transistor Liquid Crystal Display is called for short TFT-LCD) driving circuit.
Background technology
TFT-LCD mainly comprises liquid crystal panel, gate driver circuit, source electrode drive circuit, time schedule controller and backlight.Liquid crystal panel by array base palte and color membrane substrates and the liquid crystal during being arranged on consist of, data line and grid line are formed on the array base palte, the thin film transistor (TFT) (Thin Film Transistor is called for short TFT) that is arranged on grid line and data line infall is used for data-signal is sent to the pixel electrode of array base palte.Be illustrated in figure 1 as a kind of TFT-LCD driving circuit structure synoptic diagram in the prior art, time schedule controller (Timing Controller, abbreviation TCON) 1 is used for generating the control signal that is used for controlling the control signal of source electrode drive circuit 2 and is used for control gate driver circuit 3 according to the synchronizing signal of input, synchronizing signal comprises effective (Data Enable, vehicle economy) signal of horizontal-drive signal, vertical synchronizing signal and data etc.; Power module 4 is used for signal and the common electrode signal (this area be commonly referred to VCOM signal) required according to the required signal of the required signal of input reference voltage Generation Liquid crystal display, source electrode drive circuit 2, gate driver circuit 3; The signal that source electrode drive circuit that gamma generation module 5 is used for generating according to power module 42 is required generates a plurality of voltage signals that determine the gamma GTG, and a plurality of voltage signals of the decision gamma GTG that generates are input to source electrode drive circuit 2; Gate driver circuit 3 is used for the signal required according to the gate driver circuit 3 of time schedule controller 1 input, generates to be used for the signal that the control grid line is opened or closed; The required signal of source electrode drive circuit that source electrode drive circuit 2 generates according to time schedule controller 1 generates and drives the required data-signal of liquid crystal, and data-signal is input in the pixel electrode on the panel 6.Source electrode drive circuit 2 comprises a plurality of source drive electronic circuits, for example comprises the first source drive electronic circuit 2a, the second source drive electronic circuit 2b and the 3rd source drive electronic circuit 2c, and each source drive electronic circuit is responsible for driving a part of data line.Gate driver circuit 3 comprises a plurality of grid drive sub-circuits, for example comprises first grid drive sub-circuits 3a, second grid drive sub-circuits 3b and the 3rd grid drive sub-circuits 3c, and each grid drive sub-circuits is responsible for driving a part of grid line.Among Fig. 1, the circuit diagram that the electric capacity on the panel 6 and resistance form is equivalent load (LOAD) synoptic diagram of panel 6.
Common electrode signal and the voltage difference that is applied between the data-signal on the pixel electrode drive the liquid crystal molecule counter-rotating.Aging for fear of liquid crystal molecule, the polarity that is applied to the voltage of liquid crystal molecule both sides changes once every a frame, namely during the n frame, be applied to the voltage of the data-signal on the pixel electrode greater than the voltage of common electrode signal, the voltage that is applied to the liquid crystal molecule both sides is positive polarity, during the n+1 frame, be applied to the voltage of the data-signal on the pixel electrode less than the voltage of common electrode signal, n frame and n+1 frame keep common electrode signal voltage constant, and the voltage that is applied to the liquid crystal molecule both sides is negative polarity.
Be illustrated in figure 2 as in the prior art synoptic diagram that common electrode signal is input in the panel, the common electrode signal that power module generates is directly inputted to flexible PCB (Chip on Film, be called for short COF) certain point of fixity 7a on 7, the electrode that is used for the reception common electrode signal on this point of fixity 7a and the panel 6 is connected.The common electrode signal that is input on each electrode that is used for the reception common electrode signal is same.Passed through source electrode drive circuit 2 although be used for the line of expression common electrode signal among Fig. 2, in fact each source drive electronic circuit in the source electrode drive circuit does not participate in the processing to common electrode signal.
The problem that driving method shown in Fig. 2 exists is: each voltage for the signal of inputting on the electrode that receives common electrode signal is all identical on the panel, in fact, because everywhere load is different on the panel, the voltage of the common electrode signal that diverse location needs on the display panels is different, for example, the common electrode signal that the zone that the data line that the first source drive electronic circuit is responsible for driving covers needs may be 5.8 volts signal, the common electrode signal that the zone that the data line that the second source drive electronic circuit is responsible for driving covers needs may be 5.5 volts signal, and the common electrode signal that the zone that the data line that the 3rd source drive electronic circuit is responsible for driving covers needs may be 5.3 volts signal.If adopt method of the prior art, each voltage for the signal of inputting on the electrode that receives common electrode signal is all identical on the panel, then can cause TFT-LCD film flicker (flicker), and can cause the existence of residual flip-flop (being commonly referred to residual DC in this area), affect picture disply.
Summary of the invention
The objective of the invention is for problems of the prior art, a kind of TFT-LCD driving circuit is provided, can reduce the TFT-LCD film flicker, and can reduce residual flip-flop.
For achieving the above object, the invention provides a kind of TFT-LCD driving circuit, comprise for the common electrode signal generation module that generates common electrode signal, also comprise compensating circuit, being connected the electrode that is used for the reception common electrode signal with panel with described common electrode signal generation module is connected, the voltage that is used for being used on the described panel receiving on the electrode of common electrode signal compensate, so that the voltage on the electrode of common electrode signal of being used for receiving of diverse location reaches separately target voltage on the described panel.
Wherein, compensating circuit comprises the first compensating circuit and the second compensating circuit at least;
The first compensating circuit, be connected with described common electrode signal generation module is connected primary importance with panel the electrode that be used for to receive common electrode signal respectively, be used for the voltage on the electrode that is used for the reception common electrode signal of described primary importance is compensated, so that the voltage on the electrode that is used for the reception common electrode signal of described primary importance reaches first object voltage;
The second compensating circuit, be connected with described common electrode signal generation module is connected the second place with panel the electrode that be used for to receive common electrode signal respectively, be used for the voltage on the electrode that is used for the reception common electrode signal of the described second place is compensated, so that the voltage on the electrode that is used for the reception common electrode signal of the described second place reaches the second target voltage.
Wherein, the first compensating circuit comprises: the first electric capacity, the first resistance, the second resistance and the first operational amplifier;
The two ends of described the first electric capacity respectively with described panel on primary importance the electrode that be used for to receive common electrode signal be connected resistance and be connected, described the first resistance respectively with described the first electric capacity be connected the inverting input of the first operational amplifier and be connected, described the second resistance respectively with the inverting input of described the first operational amplifier be connected the output terminal of the first operational amplifier and be connected, the in-phase input end of described the first operational amplifier is connected with described common electrode signal generation module, and the electrode that is used for receiving common electrode signal of primary importance is connected on the output terminal of described the first operational amplifier and the described panel.
The second compensating circuit comprises: the second electric capacity, the 3rd resistance, the 4th resistance and the second operational amplifier;
The two ends of described the second electric capacity are connected with the 3rd resistance with the second detecting module respectively, described the 3rd resistance respectively with described the second electric capacity be connected the inverting input of the second operational amplifier and be connected, described the 4th resistance respectively with the inverting input of described the second operational amplifier be connected the output terminal of the second operational amplifier and be connected, the in-phase input end of described the second operational amplifier is connected with described common electrode signal generation module, and the electrode that is used for receiving common electrode signal of the second place is connected on the output terminal of described the second operational amplifier and the described panel.
The first compensating circuit and the second compensating circuit can be arranged in the source electrode drive circuit, and perhaps the first compensating circuit and the second compensating circuit can be arranged in the gate driver circuit.
TFT-LCD driving circuit provided by the invention, adopt compensating circuit, to compensate for the voltage on the electrode that receives common electrode signal on the panel, so that the voltage on the electrode that be used for to receive common electrode signal of diverse location can reach respectively separately target voltage on the panel, thereby can reduce TFT-LCD film flicker (flicker), and can reduce residual flip-flop, improve picture display effect.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Figure 1 shows that a kind of TFT-LCD driving circuit structure synoptic diagram in the prior art;
Figure 2 shows that in the prior art synoptic diagram that common electrode signal is input in the panel;
Figure 3 shows that TFT-LCD driving circuit structure synoptic diagram of the present invention;
Figure 4 shows that the structural representation of TFT-LCD driving circuit the first embodiment of the present invention;
Figure 5 shows that the principle of work synoptic diagram of Fig. 4;
Figure 6 shows that the structural representation of TFT-LCD driving circuit the second embodiment of the present invention;
Figure 7 shows that the structural representation of TFT-LCD driving circuit the 3rd embodiment of the present invention;
Figure 8 shows that the structural representation of TFT-LCD driving circuit the 4th embodiment of the present invention.
Embodiment
Be illustrated in figure 3 as TFT-LCD driving circuit structure synoptic diagram of the present invention, this driving circuit comprises for the common electrode signal generation module 1A and the compensating circuit 1B that generate common electrode signal, compensating circuit 1B is connected the electrode that is used for the reception common electrode signal with common electrode signal generation module 1A respectively and is connected with panel, the voltage that is used for being used on the panel receiving on the electrode of common electrode signal compensate, so that the voltage on the electrode of common electrode signal of being used for receiving of diverse location reaches separately target voltage on the described panel.
TFT-LCD driving circuit provided by the invention, adopt compensating circuit, to compensate for the voltage on the electrode that receives common electrode signal on the panel, so that the voltage on the electrode that be used for to receive common electrode signal of diverse location can reach respectively separately target voltage on the panel, thereby can reduce TFT-LCD film flicker (flicker), and can reduce residual flip-flop, improve picture display effect.
Be illustrated in figure 4 as the structural representation of TFT-LCD driving circuit the first embodiment of the present invention,, among this embodiment, compensating circuit 1B comprises the first compensating circuit 12 and the second compensating circuit 13 at least; The first compensating circuit 12 is connected with common electrode signal generation module 1A is connected primary importance with array base palte the electrode that be used for to receive common electrode signal respectively, be used for the voltage on the electrode that is used for the reception common electrode signal of primary importance is compensated, so that the voltage on the electrode that is used for the reception common electrode signal of primary importance reaches first object voltage; The second compensating circuit 13 is connected with common electrode signal generation module 1A is connected the second place with panel the electrode that be used for to receive common electrode signal respectively, be used for the voltage on the electrode that is used for the reception common electrode signal of the described second place is compensated, so that the voltage on the electrode that is used for the reception common electrode signal of the described second place reaches the second target voltage.By detecting the characteristic of panel, the picture disply flicker (flicker) that can obtain panel is the voltage swing of the actual required common electrode signal in each position of hour panel, that is to say, the characteristic of first object voltage and the second target voltage and panel has relation, can obtain by detecting in advance.
Among Fig. 4, the common electrode signal generation module can be various modules for generating common electrode signal, for example can be the power module among Fig. 1.
Figure 5 shows that the principle of work synoptic diagram of Fig. 4, the principle of work of driving circuit shown in Figure 4 is: on the panel 6 because everywhere load is different, so the voltage of the common electrode signal that each position needs is not identical yet, suppose that the common electrode signal voltage that primary importance A needs on the panel 6 is first object voltage, the common electrode signal voltage that second place B needs is the second target voltage.The common electrode signal that common electrode signal generation module 1A generates is input in the first compensating circuit 12, the first compensating circuit 12 compensates this common electrode signal, so that the common electrode signal voltage after the compensation reaches first object voltage, then common electrode signal is input to the electrode that is used for receiving common electrode signal of primary importance A on the panel 6; Similarly, the common electrode signal that common electrode signal generation module 1A generates is input in the second compensating circuit 13, the second compensating circuit 13 compensates this common electrode signal, so that the common electrode signal voltage after the compensation reaches the second target voltage, then common electrode signal is input to the electrode that is used for receiving common electrode signal of second place B on the panel 6.
The TFT-LCD driving circuit that first embodiment of the invention provides, adopt the first compensating circuit and the second compensating circuit, voltage on the electrode that is used for the reception common electrode signal of primary importance on the panel and the second place is compensated, so that the voltage on the electrode that is used for the reception common electrode signal of primary importance and the second place can reach respectively target voltage separately, thereby can reduce TFT-LCD film flicker (flicker), and can reduce residual flip-flop, improve picture display effect.
Be illustrated in figure 6 as the structural representation of TFT-LCD driving circuit the second embodiment of the present invention, wherein, the first compensating circuit 12 comprises: the first capacitor C 1, the first resistance R 1, the second resistance R 2 and the first operational amplifier OP1; The two ends of the first capacitor C 1 respectively with panel 6 on primary importance the electrode (not shown) that be used for to receive common electrode signal be connected resistance R 1 and be connected, the first resistance R 1 respectively with the first capacitor C 1 be connected the inverting input OP1a of operational amplifier OP1 and be connected, the second resistance R 2 respectively with the inverting input OP1b of the first operational amplifier OP1 be connected the output terminal OP1c of operational amplifier OP1 and be connected, the in-phase input end OP1b of the first operational amplifier OP1 is connected with common electrode signal generation module 1A, and the electrode that is used for receiving common electrode signal of primary importance is connected on the output terminal OP1c of the first operational amplifier and the panel 6.
The second compensating circuit 13 comprises: the second capacitor C 2, the 3rd resistance R 3, the 4th resistance R 4 and the second operational amplifier OP2; The two ends of the second capacitor C 2 respectively with panel 6 on the electrode (not shown) that be used for to receive common electrode signal of the second place be connected with the 3rd resistance R 3, the 3rd resistance R 3 respectively with the second capacitor C 2 be connected the inverting input OP2a of operational amplifier OP2 and be connected, the 4th resistance R 4 respectively with the inverting input OP2a of the second operational amplifier OP2 be connected the output terminal OP2c of operational amplifier OP2 and be connected, the in-phase input end OP2b of the second operational amplifier OP2 is connected with common electrode signal generation module 1A, and the electrode that is used for receiving common electrode signal of the second place is connected on the output terminal OP2c of the second operational amplifier OP 2 and the panel 6.Among Fig. 6, two circuit on the panel 6 are used for the equivalent load (LOAD) on the expression panel.
Among the embodiment shown in Figure 6, the compensating circuit that the first compensating circuit and the second compensating circuit adopt two operational amplifiers and each resistance, electric capacity to form is realized.For the first compensating circuit, just can realize different compensation by the ratio that the first resistance and the resistance of the second resistance are set.For example, the resistance of the first resistance is set to 4.1 kilo-ohms, the prevention of the second resistance is set to 3.1 kilo-ohms, the concrete resistance how the first resistance and the second resistance are set need to be determined according to the difference between the target voltage of the voltage of the common electrode signal of common electrode signal generation module output and primary importance.Similarly, for the second compensation point, the ratio of the resistance by the 3rd resistance and the 4th resistance are set also can realize required compensation, how the resistance of the 3rd resistance and the 4th resistance is set, need to determines according to the difference between the target voltage of the voltage of the common electrode signal of common electrode signal generation module output and the second place.In addition, the capacitance size of the first electric capacity and the second electric capacity also can be adjusted according to each compensating circuit actual needs.The first operational amplifier and the second operational amplifier also comprise power end and earth terminal usually, and the signal of power end and earth terminal input is so that operational amplifier work.
The common electrode signal generation module can be as shown in Figure 6, and the common electrode signal that the common electrode signal generation module generates is to carry out dividing potential drop by the 5th resistance R 5 and 6 pairs of power supplys of the 6th resistance R to obtain.
Comprise two compensating circuits in the driving circuit shown in Figure 4, in fact, can comprise more compensating circuits, for example, panel is divided into a plurality of positions, the corresponding compensating circuit in each position, each compensating circuit is connected with the electrode that is used for the reception common electrode signal of common electrode signal generation module and each position respectively, each compensating circuit carries out different compensation with the common electrode signal that the common electrode signal generation module generates, so that the voltage on the electrode that is used for the reception common electrode signal of each position all can reach target voltage separately.
Common electrode signal is input to the electrode that is used for receiving common electrode signal on the panel after can being generated by the common electrode signal generation module; Common electrode signal also can be input in the source electrode drive circuit, and then common electrode signal is input to the electrode that is used for receiving common electrode signal on the panel by source electrode drive circuit; Common electrode signal also can be input in the gate driver circuit, and then common electrode signal is input to the electrode that is used for receiving common electrode signal on the panel by gate driver circuit.
If be input to the electrode that is used for receiving common electrode signal on the panel by source electrode drive circuit during common electrode signal, then the first compensating circuit and the second compensating circuit can be arranged in the source electrode drive circuit among Fig. 4.Be illustrated in figure 7 as the structural representation of TFT-LCD driving circuit the 3rd embodiment of the present invention, usually source electrode drive circuit comprises a plurality of source drive electronic circuits, two source drive electronic circuits have been drawn among Fig. 7, be specially the first source drive electronic circuit 2a and the second source drive electronic circuit 2b, the first source drive electronic circuit 2a is responsible for driving a part of data line, and the second source drive electronic circuit 2b is responsible for driving another part data line.The first compensating circuit 12 is arranged among the first source drive electronic circuit 2a, the first compensating circuit 12 is connected with the common electrode signal generation module is connected primary importance with panel the electrode that be used for to receive common electrode signal respectively, and primary importance can be the zone of the first source drive electronic circuit 2a data line covering of being responsible for driving.The second compensating circuit 13 is arranged among the second source drive electronic circuit 2b, the second compensating circuit 13 is connected with the common electrode signal generation module is connected the second place with panel the electrode that be used for to receive common electrode signal respectively, and the second place can be the zone of the second source drive electronic circuit data line covering of being responsible for driving.
The first compensating circuit 12 be connected compensating circuit 13 and can be connected by the electrode that is used for the reception common electrode signal of diverse location on the different point of fixity on the flexible PCB 7 and the panel, for example, among Fig. 7, the first compensating circuit 12 is connected with the electrode that is used for the reception common electrode signal of primary importance by the first point of fixity P1 on the flexible PCB 7, and the second compensating circuit 13 is connected with the electrode for receiving common electrode signal of the second place by the second point of fixity P2 on the flexible PCB 7.The first point of fixity P1 and the second point of fixity P2 can regard two feedback points as, these two feedback points are given the first compensating circuit 12 and the second compensating circuit 13 with the Voltage Feedback of the common electrode signal of primary importance and the second place respectively, the first compensating circuit 12 and the second compensating circuit 13 are input to respectively this two feedback points with the common electrode signal after the compensation after respectively the voltage of the voltage that feeds back to and the input of common electrode signal generation module being carried out computing.
If common electrode signal is to be input to the electrode that is used for receiving common electrode signal on the panel by gate driver circuit, then the first compensating circuit and the second compensating circuit can be arranged in the gate driver circuit among Fig. 4.Be illustrated in figure 8 as TFT-LCD driving circuit the 4th example structure synoptic diagram of the present invention, usually source electrode drive circuit comprises a plurality of grid drive sub-circuits, two grid drive sub-circuits have been drawn among Fig. 8, be specially first grid drive sub-circuits 3a and second grid drive sub-circuits 3b, first grid drive sub-circuits 3a is responsible for driving a part of grid line, and second grid drive sub-circuits 3b is responsible for driving another part grid line.The first compensating circuit 12 is arranged among the first grid drive sub-circuits 3a, the first compensating circuit 12 is connected with the common electrode signal generation module is connected primary importance with panel the electrode that be used for to receive common electrode signal respectively, and primary importance can be the zone of the first grid drive sub-circuits 3a grid line covering being responsible for driving.The second compensating circuit 13 is arranged among the second grid drive sub-circuits 3b, the second compensating circuit is connected with the common electrode signal generation module is connected the second place with panel the electrode that be used for to receive common electrode signal respectively, and the second place can be the zone of the second grid drive sub-circuits 3b data line covering being responsible for driving.
The first compensating circuit 12 be connected compensating circuit 13 and also can be connected by the electrode that is used for the reception common electrode signal of diverse location on the different point of fixity on the flexible PCB 7 and the panel, for example, among Fig. 8, the first compensating circuit 12 is connected with the electrode that is used for the reception common electrode signal of primary importance by the first point of fixity P1 on the flexible PCB 7, and the second compensating circuit 13 is connected with the electrode for receiving common electrode signal of the second place by the second point of fixity P2 on the flexible PCB 7.The first point of fixity P1 and the second point of fixity P2 can regard two feedback points as, these two feedback points are given the first compensating circuit and the second compensating circuit with the Voltage Feedback of the common electrode signal of primary importance and the second place respectively, after the first compensating circuit and the second compensating circuit carry out computing with the voltage of the voltage that feeds back to and the input of common electrode signal generation module respectively, the common electrode signal after the compensation is input to respectively this two each and every one feedback point.
Among the TFT-LCD, form memory capacitance between common electrode signal line on the array base palte and the pixel electrode, public electrode on the color membrane substrates and the voltage difference of the pixel electrode on the array base palte drive the liquid crystal molecule counter-rotating, usually all input common electrode signal on the public electrode on common electrode signal line and the color membrane substrates, in the various embodiments of the present invention, the electrode that be used for to receive common electrode signal can be common electrode signal line on the array base palte or the public electrode on the color membrane substrates.Among the TFT-LCD that has public electrode being arranged on the array base palte, also can be public electrode on the array base palte so be used for to receive the electrode of common electrode signal.
In an embodiment of the present invention, because the voltage on the electrode that is used for the reception common electrode signal of diverse location is different, so being used for the electrode of reception common electrode signal should be to arrange according to the diverse location on the panel, for example, primary importance a public electrode is set, the second place arranges a public electrode, and should not be that whole panel arranges same public electrode.
It should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not limit it, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment or be equal to replacement technical scheme of the present invention, and these modifications or be equal to replacement and also can not make amended technical scheme break away from the spirit and scope of technical solution of the present invention.
Claims (7)
1. a TFT-LCD driving circuit is connected with panel, and described driving circuit comprises for the common electrode signal generation module that generates common electrode signal, it is characterized in that,
Described panel is divided into a plurality of positions;
Described driving circuit also comprises a plurality of compensating circuits, the corresponding compensating circuit in each position, each compensating circuit is connected with described common electrode signal generation module is connected each position with panel the electrode that be used for to receive common electrode signal respectively, the voltage that is used for being used on the described panel receiving on the electrode of common electrode signal compensate, so that the voltage on the electrode of common electrode signal of being used for receiving of each diverse location reaches separately target voltage on the described panel;
Described a plurality of compensating circuit all is arranged in the source electrode drive circuit or all is arranged in the gate driver circuit; Further, described a plurality of compensating circuit is arranged in the different source drive electronic circuits of source electrode drive circuit; Or described a plurality of compensating circuit is arranged in the different grid drive sub-circuits of gate driver circuit;
Each compensating circuit comprises two resistance, electric capacity and amplifiers, realizes different voltage compensations by the ratio that resistance is set.
2. TFT-LCD driving circuit according to claim 1 is characterized in that, described a plurality of compensating circuits comprise the first compensating circuit and the second compensating circuit at least;
Described the first compensating circuit, be connected with described common electrode signal generation module is connected primary importance with panel the electrode that be used for to receive common electrode signal respectively, be used for the voltage on the electrode that is used for the reception common electrode signal of described primary importance is compensated, so that the voltage on the electrode that is used for the reception common electrode signal of described primary importance reaches first object voltage;
Described the second compensating circuit, be connected with described common electrode signal generation module is connected the second place with panel the electrode that be used for to receive common electrode signal respectively, be used for the voltage on the electrode that is used for the reception common electrode signal of the described second place is compensated, so that the voltage on the electrode that is used for the reception common electrode signal of the described second place reaches the second target voltage.
3. TFT-LCD driving circuit according to claim 2 is characterized in that, described the first compensating circuit comprises: the first electric capacity, the first resistance, the second resistance and the first operational amplifier;
The two ends of described the first electric capacity respectively with described panel on primary importance the electrode that be used for to receive common electrode signal be connected resistance and be connected, described the first resistance respectively with described the first electric capacity be connected the inverting input of the first operational amplifier and be connected, described the second resistance respectively with the inverting input of described the first operational amplifier be connected the output terminal of the first operational amplifier and be connected, the in-phase input end of described the first operational amplifier is connected with described common electrode signal generation module, and the electrode that is used for receiving common electrode signal of primary importance is connected on the output terminal of described the first operational amplifier and the described panel.
4. TFT-LCD driving circuit according to claim 3 is characterized in that, described the second compensating circuit comprises: the second electric capacity, the 3rd resistance, the 4th resistance and the second operational amplifier;
The two ends of described the second electric capacity respectively with described panel on the electrode that be used for to receive common electrode signal of the second place be connected with the 3rd resistance, described the 3rd resistance respectively with described the second electric capacity be connected the inverting input of the second operational amplifier and be connected, described the 4th resistance respectively with the inverting input of described the second operational amplifier be connected the output terminal of the second operational amplifier and be connected, the in-phase input end of described the second operational amplifier is connected with described common electrode signal generation module, and the electrode that is used for receiving common electrode signal of the second place is connected on the output terminal of described the second operational amplifier and the described panel.
5. TFT-LCD driving circuit according to claim 4 is characterized in that, described the first compensating circuit and the second compensating circuit are arranged in the source electrode drive circuit, and perhaps described the first compensating circuit and the second compensating circuit are arranged in the gate driver circuit.
6. TFT-LCD driving circuit according to claim 5, it is characterized in that, described the first compensating circuit is arranged in the first source drive electronic circuit of described source electrode drive circuit, and described the second compensating circuit is arranged in the second source drive electronic circuit of described source electrode drive circuit; Perhaps
Described the first compensating circuit is arranged in the first grid drive sub-circuits of described gate driver circuit, and described the second compensating circuit is arranged in the second grid drive sub-circuits of described gate driver circuit.
7. the described TFT-LCD driving circuit of arbitrary claim according to claim 2-6, it is characterized in that described the first compensating circuit is connected by the electrode that is used for receiving common electrode signal of primary importance on the first point of fixity on the flexible PCB and the described panel;
Described the second compensating circuit is connected by the electrode that is used for receiving common electrode signal of the second place on the second point of fixity on the described flexible PCB and the described panel.
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|---|---|---|---|
| CN 200910091998 CN102013235B (en) | 2009-09-04 | 2009-09-04 | TFT-LCD (Thin Film Transistor-Liquid Crystal Display) drive circuit |
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| CN 200910091998 CN102013235B (en) | 2009-09-04 | 2009-09-04 | TFT-LCD (Thin Film Transistor-Liquid Crystal Display) drive circuit |
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| CN102013235B true CN102013235B (en) | 2013-04-17 |
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| CN102842295B (en) * | 2012-08-15 | 2015-01-21 | 京东方科技集团股份有限公司 | Common electrode Vcom voltage regulation method and device |
| CN103514854B (en) * | 2013-10-28 | 2015-06-03 | 京东方科技集团股份有限公司 | Public electrode voltage compensation control circuit and method, array substrate and display device |
| CN104299593B (en) * | 2014-11-07 | 2017-01-25 | 深圳市华星光电技术有限公司 | Liquid crystal display device |
| CN105096854B (en) * | 2015-07-16 | 2017-11-17 | 深圳市华星光电技术有限公司 | A kind of drive circuit and liquid crystal display panel |
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| CN106782397A (en) * | 2017-01-03 | 2017-05-31 | 京东方科技集团股份有限公司 | The compensation method of display panel and its common electric voltage, display device |
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