CN102013235A - 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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- CN102013235A CN102013235A CN200910091998XA CN200910091998A CN102013235A CN 102013235 A CN102013235 A CN 102013235A CN 200910091998X A CN200910091998X A CN 200910091998XA CN 200910091998 A CN200910091998 A CN 200910091998A CN 102013235 A CN102013235 A CN 102013235A
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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 constitute, 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 to control the control signal of source electrode drive circuit 2 and is used to 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; Gamma generation module 5 is used for the required signal of the source electrode drive circuit that generates according to power module 42, generates a plurality of voltage signals of decision 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 to control the signal that 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 electrode drive sub-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 gate driving electronic circuits, for example comprises first grid drive sub-circuits 3a, second grid drive sub-circuits 3b and the 3rd gate driving electronic circuit 3c, and each gate driving electronic circuit is responsible for driving a part of grid line.Among Fig. 1, the circuit diagram that electric capacity on the panel 6 and resistance are formed 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, promptly during the n frame, be applied to the voltage of the voltage of the data-signal on the pixel electrode greater than 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 voltage of the data-signal on the pixel electrode less than 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 to receive 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 to receive common electrode signal is same.Though be used among Fig. 2 represent that the line of common electrode signal has passed through source electrode drive circuit 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: on the panel each to be used to receive the voltage of signals of importing on the electrode of common electrode signal all identical, in fact, because everywhere load difference on the panel, the voltage difference of the common electrode signal that diverse location needs on the display panels, 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 a 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 a 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 a signal.If adopt method of the prior art, on the panel each to be used to receive the voltage of signals of importing on the electrode of common electrode signal all identical, 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), influence picture and show.
Summary of the invention
The objective of the invention is at 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 the common electrode signal generation module that is used to generate common electrode signal, also comprise compensating circuit, be connected with the electrode that is used to receive common electrode signal on described common electrode signal generation module and the panel, the voltage that is used for being used on the described panel to receive on the electrode of common electrode signal compensates, and makes the voltage on the electrode of common electrode signal of being used to receive of diverse location on the described panel reach separately target voltage.
Wherein, compensating circuit comprises first compensating circuit and second compensating circuit at least;
First compensating circuit, be connected with the electrode that is used to receive common electrode signal of primary importance on described common electrode signal generation module and the panel respectively, be used for the voltage that is used to receive on the electrode of common electrode signal of described primary importance is compensated, make the voltage that is used to receive on the electrode of common electrode signal of described primary importance reach first target voltage;
Second compensating circuit, be connected with the electrode that is used to receive common electrode signal of the second place on described common electrode signal generation module and the panel respectively, be used for the voltage that is used to receive on the electrode of common electrode signal of the described second place is compensated, make the voltage that is used to receive on the electrode of common electrode signal of the described second place reach second target voltage.
Wherein, first compensating circuit comprises: first electric capacity, first resistance, second resistance and first operational amplifier;
The two ends of described first electric capacity respectively with described panel on the electrode that is used to receive common electrode signal of primary importance be connected with first resistance, described first resistance is connected with the inverting input of described first electric capacity and described first operational amplifier respectively, described second resistance is connected with the inverting input of described first operational amplifier and the output terminal of described first operational amplifier respectively, the in-phase input end of described first operational amplifier is connected with described common electrode signal generation module, and the electrode that is used to receive common electrode signal of primary importance is connected on the output terminal of described first operational amplifier and the described panel.
Second compensating circuit comprises: second electric capacity, the 3rd resistance, the 4th resistance and second operational amplifier;
The two ends of described second electric capacity are connected with the 3rd resistance with second detecting module respectively, described the 3rd resistance is connected with the inverting input of described second electric capacity and described second operational amplifier respectively, described the 4th resistance is connected with the inverting input of described second operational amplifier and the output terminal of described second operational amplifier respectively, the in-phase input end of described second operational amplifier is connected with described common electrode signal generation module, and the electrode that is used to receive common electrode signal of the second place is connected on the output terminal of described second operational amplifier and the described panel.
First compensating circuit and second compensating circuit can be arranged in the source electrode drive circuit, and perhaps first compensating circuit and second compensating circuit can be arranged in the gate driver circuit.
TFT-LCD driving circuit provided by the invention, adopt compensating circuit, the voltage that is used on the panel to receive on the electrode of common electrode signal is compensated, make being used to receive voltage on the electrode of common electrode signal and can reaching separately target voltage respectively of diverse location 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 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 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 common electrode signal generation module 1A and the compensating circuit 1B that is used to generate common electrode signal, compensating circuit 1B respectively with common electrode signal generation module 1A and panel on be used to receive common electrode signal electrode be connected, the voltage that is used for being used on the panel to receive on the electrode of common electrode signal compensates, and makes the voltage on the electrode of common electrode signal of being used to receive of diverse location on the described panel reach separately target voltage.
TFT-LCD driving circuit provided by the invention, adopt compensating circuit, the voltage that is used on the panel to receive on the electrode of common electrode signal is compensated, make being used to receive voltage on the electrode of common electrode signal and can reaching separately target voltage respectively of diverse location 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 first embodiment of the present invention,, among this embodiment, compensating circuit 1B comprises first compensating circuit 12 and second compensating circuit 13 at least; First compensating circuit 12 is connected with the electrode that is used to receive common electrode signal of primary importance on common electrode signal generation module 1A and the array base palte respectively, be used for the voltage that is used to receive on the electrode of common electrode signal of primary importance is compensated, make the voltage that is used to receive on the electrode of common electrode signal of primary importance reach first target voltage; Second compensating circuit 13 is connected with the electrode that is used to receive common electrode signal of the second place on common electrode signal generation module 1A and the panel respectively, be used for the voltage that is used to receive on the electrode of common electrode signal of the described second place is compensated, make the voltage that is used to receive on the electrode of common electrode signal of the described second place reach second target voltage.By detecting the characteristic of panel, the picture that can obtain panel shows the voltage swing of the actual required common electrode signal in each position of hour panel of flicker (flicker), that is to say, the characteristic of first target voltage and second target voltage and panel has relation, can obtain by detecting in advance.
Among Fig. 4, the common electrode signal generation module can be the various modules that are used to generate 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 difference, so the voltage of the common electrode signal that each position needs is also inequality, suppose that the common electrode signal voltage that primary importance A needs on the panel 6 is first target voltage, the common electrode signal voltage that second place B needs is second target voltage.The common electrode signal that common electrode signal generation module 1A generates is input in first compensating circuit 12, first compensating circuit 12 compensates this common electrode signal, make the common electrode signal voltage after the compensation reach first target voltage, then common electrode signal is input to the electrode that is used to receive 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 second compensating circuit 13, second compensating circuit 13 compensates this common electrode signal, make the common electrode signal voltage after the compensation reach second target voltage, then common electrode signal is input to the electrode that is used to receive common electrode signal of second place B on the panel 6.
The TFT-LCD driving circuit that first embodiment of the invention provides, adopt first compensating circuit and second compensating circuit, the voltage that is used to receive on the electrode of common electrode signal of the primary importance on the panel and the second place is compensated, make being used to receive voltage on the electrode of common electrode signal and can reaching separately target voltage respectively of the primary importance and the second place, 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 second embodiment of the present invention, wherein, first compensating circuit 12 comprises: first capacitor C 1, first resistance R 1, second resistance R 2 and the first operational amplifier OP1; The two ends of first capacitor C 1 respectively with panel 6 on the electrode (not shown) that is used to receive common electrode signal of primary importance be connected with first resistance R 1, first resistance R 1 is connected with the inverting input OP1a of first capacitor C 1 with the first operational amplifier OP1 respectively, second resistance R 2 is connected with the inverting input OP1b of the first operational amplifier OP1 and the output terminal OP1c of the first operational amplifier OP1 respectively, 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 to receive common electrode signal of primary importance is connected on the output terminal OP1c of first operational amplifier and the panel 6.
Second compensating circuit 13 comprises: second capacitor C 2, the 3rd resistance R 3, the 4th resistance R 4 and the second operational amplifier OP2; The two ends of second capacitor C 2 respectively with panel 6 on the electrode (not shown) that is used to receive common electrode signal of the second place be connected with the 3rd resistance R 3, the 3rd resistance R 3 is connected with the inverting input OP2a of second capacitor C 2 with the second operational amplifier OP2 respectively, the 4th resistance R 4 is connected with the inverting input OP2a of the second operational amplifier OP2 and the output terminal OP2c of the second operational amplifier OP2 respectively, 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 to receive common electrode signal of the second place is connected on the output terminal OP2c of the second operational amplifier OP2 and the panel 6.Among Fig. 6, two circuit on the panel 6 are used to represent the equivalent load (LOAD) on the panel.
Among the embodiment shown in Figure 6, the compensating circuit that first compensating circuit and second compensating circuit adopt two operational amplifiers and each resistance, electric capacity to form is realized.For first compensating circuit, just can realize different compensation by the ratio that first resistance and the resistance of second resistance are set.For example, the resistance of first resistance is set to 4.1 kilo-ohms, the prevention of second resistance is set to 3.1 kilo-ohms, the concrete resistance how first resistance and second resistance are set need 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 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 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 first electric capacity and second electric capacity also can be adjusted according to each compensating circuit actual needs.First operational amplifier and second operational amplifier also comprise power end and earth terminal usually, and the signal of power end and earth terminal input makes 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 a plurality of 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 to receive 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, and makes being used to receive voltage on the electrode of common electrode signal and all can reaching separately target voltage of each position.
Common electrode signal is input to the electrode that is used to receive 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 to receive 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 to receive common electrode signal on the panel by gate driver circuit.
If be input to the electrode that is used to receive common electrode signal on the panel by source electrode drive circuit during common electrode signal, then first compensating circuit and 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 electrode drive sub-circuits, two source drive electronic circuits have 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.First compensating circuit 12 is arranged among the first source drive electronic circuit 2a, first compensating circuit 12 is connected with the electrode that is used to receive common electrode signal of primary importance on common electrode signal generation module and the panel respectively, and primary importance can be the zone that data line that the first source drive electronic circuit 2a is responsible for driving covers.Second compensating circuit 13 is arranged among the second source drive electronic circuit 2b, second compensating circuit 13 is connected with the electrode that is used to receive common electrode signal of the second place on common electrode signal generation module and the panel respectively, and the second place can be the zone that data line that the second source drive electronic circuit is responsible for driving covers.
First compensating circuit 12 and second compensating circuit 13 can be connected by the electrode that is used to receive 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, first compensating circuit 12 is connected by the electrode that is used to receive common electrode signal of the first point of fixity P1 on the flexible PCB 7 and primary importance, and second compensating circuit 13 is connected by the electrode that is used to receive common electrode signal of the second point of fixity P2 on the flexible PCB 7 and the second place.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 first compensating circuit 12 and second compensating circuit 13 with the Voltage Feedback of the common electrode signal of the primary importance and the second place respectively, first compensating circuit 12 and second compensating circuit 13 are input to this two feedback points respectively 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 to receive common electrode signal on the panel by gate driver circuit, then first compensating circuit and 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 gate driving electronic circuits, two gate driving electronic circuits have 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.First compensating circuit 12 is arranged among the first grid drive sub-circuits 3a, first compensating circuit 12 is connected with the electrode that is used to receive common electrode signal of primary importance on common electrode signal generation module and the panel respectively, and primary importance can be the zone that grid line that first grid drive sub-circuits 3a is responsible for driving covers.Second compensating circuit 13 is arranged among the second grid drive sub-circuits 3b, second compensating circuit is connected with the electrode that is used to receive common electrode signal of the second place on common electrode signal generation module and the panel respectively, and the second place can be the zone that data line that second grid drive sub-circuits 3b is responsible for driving covers.
First compensating circuit 12 and second compensating circuit 13 also can be connected by the electrode that is used to receive 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, first compensating circuit 12 is connected by the electrode that is used to receive common electrode signal of the first point of fixity P1 on the flexible PCB 7 and primary importance, and second compensating circuit 13 is connected by the electrode that is used to receive common electrode signal of the second point of fixity P2 on the flexible PCB 7 and the second place.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 first compensating circuit and second compensating circuit with the Voltage Feedback of the common electrode signal of the primary importance and the second place respectively, after first compensating circuit and 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 this two each and every one feedback point respectively.
Among the TFT-LCD, form memory capacitance between common electrode signal line on the array base palte and the pixel electrode, the 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 import 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 is used 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 to receive the electrode of common electrode signal.
In an embodiment of the present invention, because being used to of diverse location receives the voltage difference on the electrode of common electrode signal, so being used to receive the electrode of common electrode signal should be to be provided with according to the diverse location on the panel, for example, primary importance a public electrode is set, the second place is provided with a public electrode, and should not be that whole front panel is provided with 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 the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that: it still can make 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. TFT-LCD driving circuit, comprise the common electrode signal generation module that is used to generate common electrode signal, it is characterized in that, also comprise compensating circuit, be connected with the electrode that is used to receive common electrode signal on described common electrode signal generation module and the panel, the voltage that is used for being used on the described panel to receive on the electrode of common electrode signal compensates, and makes the voltage on the electrode of common electrode signal of being used to receive of diverse location on the described panel reach separately target voltage.
2. TFT-LCD driving circuit according to claim 1 is characterized in that, described compensating circuit comprises first compensating circuit and second compensating circuit at least;
Described first compensating circuit, be connected with the electrode that is used to receive common electrode signal of primary importance on described common electrode signal generation module and the panel respectively, be used for the voltage that is used to receive on the electrode of common electrode signal of described primary importance is compensated, make the voltage that is used to receive on the electrode of common electrode signal of described primary importance reach first target voltage;
Described second compensating circuit, be connected with the electrode that is used to receive common electrode signal of the second place on described common electrode signal generation module and the panel respectively, be used for the voltage that is used to receive on the electrode of common electrode signal of the described second place is compensated, make the voltage that is used to receive on the electrode of common electrode signal of the described second place reach second target voltage.
3. TFT-LCD driving circuit according to claim 2 is characterized in that, described first compensating circuit comprises: first electric capacity, first resistance, second resistance and first operational amplifier;
The two ends of described first electric capacity respectively with described panel on the electrode that is used to receive common electrode signal of primary importance be connected with first resistance, described first resistance is connected with the inverting input of described first electric capacity and described first operational amplifier respectively, described second resistance is connected with the inverting input of described first operational amplifier and the output terminal of described first operational amplifier respectively, the in-phase input end of described first operational amplifier is connected with described common electrode signal generation module, and the electrode that is used to receive common electrode signal of primary importance is connected on the output terminal of described first operational amplifier and the described panel.
4. TFT-LCD driving circuit according to claim 3 is characterized in that, described second compensating circuit comprises: second electric capacity, the 3rd resistance, the 4th resistance and second operational amplifier;
The two ends of described second electric capacity are connected with the 3rd resistance with second detecting module respectively, described the 3rd resistance is connected with the inverting input of described second electric capacity and described second operational amplifier respectively, described the 4th resistance is connected with the inverting input of described second operational amplifier and the output terminal of described second operational amplifier respectively, the in-phase input end of described second operational amplifier is connected with described common electrode signal generation module, and the electrode that is used to receive common electrode signal of the second place is connected on the output terminal of described second operational amplifier and the described panel.
5. TFT-LCD driving circuit according to claim 4 is characterized in that, described first compensating circuit and second compensating circuit are arranged in the source electrode drive circuit, and perhaps described first compensating circuit and 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 first compensating circuit is arranged in the first source drive electronic circuit of described source electrode drive circuit, and described second compensating circuit is arranged in the second source drive electronic circuit of described source electrode drive circuit; Perhaps
Described first compensating circuit is arranged in the first grid drive sub-circuits of described gate driver circuit, and described second compensating circuit is arranged in the second grid drive sub-circuits of described gate driver circuit.
7. according to the described TFT-LCD driving circuit of arbitrary claim among the claim 2-6, it is characterized in that described first compensating circuit is connected by the electrode that is used to receive common electrode signal of primary importance on first point of fixity on the flexible PCB and the described panel;
Described second compensating circuit is connected by the electrode that is used to receive common electrode signal of the second place on 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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| KR101136318B1 (en) * | 2005-04-29 | 2012-04-19 | 엘지디스플레이 주식회사 | Liquid Crystal Display device |
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