CN102737590A - Scanning electrode driving method and system and liquid crystal display - Google Patents
Scanning electrode driving method and system and liquid crystal display Download PDFInfo
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- CN102737590A CN102737590A CN2011100858112A CN201110085811A CN102737590A CN 102737590 A CN102737590 A CN 102737590A CN 2011100858112 A CN2011100858112 A CN 2011100858112A CN 201110085811 A CN201110085811 A CN 201110085811A CN 102737590 A CN102737590 A CN 102737590A
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Abstract
The invention discloses a scanning electrode driving method and system and a liquid crystal display. The system comprises a boost unit which is for carrying out boost processing on the working voltage of a circuit to obtain a gate turn-on voltage; a step-down unit which is for carrying out step-down processing on the working voltage of the circuit to obtain a gate turn-off voltage, wherein the gate turn-off voltage comprises a first gate turn-off voltage and a second gate turn-off voltage; a gate driving unit which is for controlling the gate turn-on voltage, and the output time sequence of the first gate turn-off voltage and the second gate turn-off voltage. According to the invention, a feed-through voltage can be eliminated, thus flickers on the display screen are avoided and the experience of a user is improved.
Description
Technical field
The present invention relates to appliance field, in particular to a kind of scan electrode driving method, system and LCD.
Background technology
Along with the increasingly extensive application of liquid crystal display, the high performance-price ratio product demand is also strengthened day by day, how to improve display quality, reduce cost, enhancing productivity just becomes the problem that researcher need be paid close attention to and solve.
Existing liquid crystal panel is divided into two kinds of frameworks: a kind ofly accomplish through gate line gate cabling for MM CAP; Another kind is accomplished through common reference voltage (common) cabling for MM CAP.Fig. 1 is the structural representation according to the liquid crystal molecule of the display panels of correlation technique; As shown in Figure 1, Clc is a liquid crystal capacitance, and Cs is a storage capacitors; Cgd is the stray capacitance between own grid of TFT (gate) and the drain electrode (drain), and the end of storage capacitors Cs is connected on the gate line.
The existing liquid crystal display that nowadays uses, gate drivers basically all are to adopt the two-way driven, and promptly gate driver voltage has only two-way; One road grid opens voltage (VON) and one road grid is closed voltage (VOFF1); Because this display panels adopts thin film transistor (TFT) TFT as control element, between the grid of thin film transistor (TFT) and drain electrode, stray capacitance is arranged, stray capacitance very easily receives the influence of gate drive voltage; And cause the change of current potential on the electric capacity; Thereby have influence on the variation of show electrode voltage through capacitive coupling, the variation of this voltage has inevitably produced feedback and has worn voltage, therefore causes the positive-negative polarity gray scale voltage asymmetric; Make that the GTG quality can be poor, influence image quality to a great extent.
Fig. 2 is the second order driving sequential chart according to display panels shown in Figure 1.Drive waveforms figure as shown in Figure 2; In the process that each grid gate opens according to the pulse high level time corresponding successively; Though it is simpler on driving voltage that second order drives, it can produce feedback inevitably and wear voltage, so can cause film flicker; Need regulate common reference voltage VCOM through external debug equipment and improve flicker level, can increase cost so inevitably.
To above-mentioned prior art wear voltage because the two-way Voltag driving circuit produces feedback, cause the positive-negative polarity gray scale voltage asymmetric, make the display frame flicker, influence the problem of display effect, effective solution is not proposed at present as yet.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of scan electrode driving method, system and LCD; Because producing feedback, the two-way Voltag driving circuit wears voltage with what solve prior art; Cause the positive-negative polarity gray scale voltage asymmetric, make display frame glimmer, influence the problem of display effect.
To achieve these goals, according to an aspect of the present invention, a kind of scan electrode drive system is provided.
Scan electrode drive system according to the present invention comprises: boosting unit is used for to the circuit voltage processing of boosting, to obtain the grid cut-in voltage; Pressure unit is used for that circuit voltage is carried out step-down and handles, and closes voltage to obtain grid, and grid is closed voltage and comprised that first grid is closed voltage and second grid cuts out voltage; Drive element of the grid is used to control grid cut-in voltage, first grid and closes the output timing that voltage and second grid are closed voltage.
To achieve these goals, according to another aspect of the present invention, a kind of scan electrode driving method is provided.
Scan electrode driving method according to the present invention comprises: to the circuit voltage processing of boosting, to obtain the grid cut-in voltage; Circuit voltage is carried out step-down handle, close voltage to obtain grid, grid is closed voltage and is comprised that first grid is closed voltage and second grid cuts out voltage; Control grid cut-in voltage, first grid are closed the output timing that voltage and second grid are closed voltage.
To achieve these goals, in accordance with a further aspect of the present invention, a kind of display panels is provided, this LCD comprises above-mentioned any one scan electrode drive system.
To achieve these goals, in accordance with a further aspect of the present invention, a kind of LCD is provided, this LCD comprises above-mentioned any one scan electrode drive system.
Through the present invention, adopt boosting unit, be used for to the circuit voltage processing of boosting, to obtain the grid cut-in voltage; Pressure unit is used for that circuit voltage is carried out step-down and handles, and closes voltage to obtain grid, and grid is closed voltage and comprised that first grid is closed voltage and second grid cuts out voltage; Drive element of the grid is used to control grid cut-in voltage, first grid and closes the output timing that voltage and second grid are closed voltage, and what solved prior art wears voltage because the two-way Voltag driving circuit produces feedback; Cause the positive-negative polarity gray scale voltage asymmetric; Make display frame glimmer, influence the problem of display effect, reached to eliminate to present and worn voltage; Make and avoid display display frame flicker, improved user experience effect.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation according to the liquid crystal molecule of the display panels of correlation technique;
Fig. 2 is the second order driving sequential chart according to display panels shown in Figure 1;
Fig. 3 is the structural representation according to the LCD of the embodiment of the invention;
Fig. 4 is the structural representation according to the scan electrode drive system of LCD shown in Figure 3;
Fig. 5 is the detailed structure synoptic diagram according to the scan electrode drive system of LCD shown in Figure 3;
Fig. 6 is the electrical block diagram according to the scan electrode drive system of LCD shown in Figure 3;
Fig. 7 is the schematic diagram according to the scan electrode drive system of LCD shown in Figure 3;
Fig. 8 is three rank drive waveforms figure according to LCD shown in Figure 3;
Fig. 9 is the three rank driving sequential chart according to LCD shown in Figure 3; And
Figure 10 is the process flow diagram according to the scan electrode driving method of the embodiment of the invention.
Embodiment
Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.Below with reference to accompanying drawing and combine embodiment to specify the present invention.
The invention provides a kind of scan electrode drive system.Fig. 3 is the structural representation according to the LCD of the embodiment of the invention; Fig. 4 is the structural representation according to the scan electrode drive system of LCD shown in Figure 3; Fig. 6 is the electrical block diagram according to the scan electrode drive system of LCD shown in Figure 3.
Shown in Fig. 3 and 4, this system comprises: scanning electrode drive and gate drivers, and wherein, scanning electrode drive comprises: boosting unit 1 is used for to the circuit voltage processing of boosting, to obtain the grid cut-in voltage; Pressure unit 2 is used for that circuit voltage is carried out step-down and handles, and closes voltage to obtain grid, and grid is closed voltage and comprised that first grid is closed voltage and second grid cuts out voltage; And gate drivers comprises drive element of the grid 3, is used to control grid cut-in voltage, first grid and closes the output timing that voltage and second grid are closed voltage.
The present invention is through adopting gate driver circuit three tunnel driven; Promptly one road grid cut-in voltage (positive polarity voltage), two-way grid are closed voltage (reverse voltage); With respect to two road traditional voltage driving modes; Increased by one tunnel negative polarity driving voltage; The feedback that two-way reverse voltage corresponding electrical circuits produces is worn voltage and can be cancelled out each other, and therefore can not produce the asymmetric phenomenon of positive-negative polarity gray scale voltage, so need not to debug the purpose that common reference voltage also can be realized high image quality.Such scheme has improved the application circuit of liquid crystal panel demonstration GTG quality; Common reference voltage can be regulated and the effect of high image quality can be realized; Saved and used external unit to regulate the operation of common reference voltage; And saved the corresponding periphery circuit design of common reference voltage, practiced thrift cost to a great extent, improved production efficiency.
Fig. 5 is the detailed structure synoptic diagram according to the scan electrode drive system of LCD shown in Figure 3.As shown in Figure 5; Boosting unit 1 among Fig. 4 of the present invention can comprise: one-level positive electrode charhing unit 11 doubles the circuit voltage liter, to obtain the first grid cut-in voltage; And secondary positive electrode charhing unit 13; Be connected with one-level positive electrode charhing unit 11, first grid cut-in voltage liter is doubled, to obtain the grid cut-in voltage; Pressure unit 2 among Fig. 4 of the present invention comprises: one-level negative electrode discharge cell 21, reduce by one times with circuit voltage, to obtain the one-level negative voltage; Secondary negative electrode discharge cell 23 is connected with one-level negative electrode discharge cell, and the one-level negative voltage is reduced by one times, closes voltage to obtain grid.
Like Fig. 4 and shown in Figure 5, system of the present invention also comprises control module 4, and these control module 4 concrete can comprising: positive polarity voltage control module 41 is used to obtain the grid cut-in voltage, and the grid cut-in voltage is regulated; And reverse voltage control module 42, being used for that the grid that gets access to is closed voltage and regulating, first grid is closed voltage and second grid cuts out voltage to obtain.
To sum up shown in the Figure 4 and 5; First grid in the above-mentioned steps of the present invention is closed voltage and second grid and is closed voltage and can directly generate through pressure unit 2; Control its output timing by drive element of the grid 3 then; In addition, can control and regulate the grid that pressure unit 2 generates according to the time through reverse voltage control module 41 and close voltage, thereby the output first grid closes voltage and second grid cuts out voltage.
As shown in Figure 5, the system in the above embodiment of the present invention can also comprise: the first filter capacitor C5, an end are connected on the node of the path between positive polarity voltage control module 41 and the drive element of the grid 3, other end ground connection; The second filter capacitor C6, an end are connected on the node of first path between reverse voltage control module 42 and the drive element of the grid 3, other end ground connection, and first path is used to transmit first grid and closes voltage; The 3rd filter capacitor C7, an end are connected on the node of the alternate path between reverse voltage control module 42 and the drive element of the grid 3, other end ground connection, and alternate path is used to transmit second grid and closes voltage.Above-mentioned three filter capacitors are used to reduce ripple voltage, have improved the stability of voltage.
Preferably; The present invention can comprise timing control unit through drive element of the grid 3, is used to be provided with high level H and the low level L of the first pulse signal STV1, the second pulse signal STV2 and enable signal OE, wherein; Work as STV1=H; STV2=H, during OE=L, the grid voltage of the capable gate line of drive element of the grid 3 control N-1 is grid cut-in voltage Von; Work as STV1=H, STV2=L, during OE=H, the grid voltage of the capable gate line of drive element of the grid 3 control N-1 is that first grid is closed voltage VOFF1, and first grid is closed voltage VOFF1 is saved to storage capacitors Cs; Work as STV1=H; STV2=L; During OE=L; The grid voltage of the capable gate line of drive element of the grid 3 control N-1 is that second grid cuts out voltage VOFF2, and the grid voltage of the capable gate line of drive element of the grid 3 control N is grid cut-in voltage Von, and second grid cuts out voltage VOFF2 and grid cut-in voltage Von is saved to storage capacitors Cs; Work as STV1=L, STV2=L is during OE=H; The grid voltage of the capable gate line of drive element of the grid 3 control N-1 is that first grid is closed voltage VOFF1; Retract voltage Ve=VOFF1-VOFF2 to obtain, the grid voltage of the capable gate line of drive element of the grid 3 control N is that second grid cuts out voltage VOFF2, and storage capacitors Cs preserves and retracts voltage Ve; This retracts voltage and can cause the voltage of Cs show electrode end to change; The magnitude of voltage that changes just equals feedback and wears voltage, can calculate feedback according to principle of charge conservation and wear voltage Δ V=Ve*Cs/ (Cgd+Clc+Cs), has therefore solved because the problem of the display effect difference that voltage causes is worn in feedback.
Preferably, scanning electrode drive of the present invention can be integrated into a circuit unit with gate drivers, and promptly boosting unit among the present invention 1 and pressure unit 2 can be built in drive element of the grid 3, but their logic functions each other are independently.
Fig. 7 is the schematic diagram according to the scan electrode drive system of LCD shown in Figure 3; Fig. 8 is three rank drive waveforms figure according to LCD shown in Figure 3.
Concrete, following with regard to the detailed description of the embodiment of the invention:
Shown in Fig. 4-6, the present invention utilizes common diode and triode device, through simple rectification circuit design, produces the needed three rank driving voltages of gate drivers easily, for second order drives, has increased by one road grid and has closed voltage VOFF2.Can know in conjunction with systematic schematic diagram as shown in Figure 7 and drive waveforms figure shown in Figure 8, open or close in a flash that the variation of voltage is the fiercest, nearly 30 volts to 40 volts at grid (gate) voltage of gate line.When the Gate cabling is opened, can produce a feedback that makes progress and wear voltage and affact on the show electrode.Because the cause that the gate cabling is opened; The source of source electrode line (source) electrode can charge to show electrode; Wear voltage even can produce bigger feedback, but the source electrode can be added to correct voltage on the show electrode still, so that voltage is worn in feedback is little to the show electrode voltage influence.When the gate cabling is closed; Can produce a pressure drop that voltage is downward equally; Have 30 to 40 volts approximately, but the source electrode is no longer to show electrode charging, voltage drop just can affact on the show electrode through the Cgd stray capacitance; Cause show electrode that the pressure drop of a feed through is arranged, thereby can influence the gray-level characteristic of image quality.And the feed through voltage of this feed through voltage when opening unlike the gate cabling is the same; Only influence gray-level characteristic in moment; Because source drive this moment (source driver) no longer discharges and recharges show electrode; Therefore the voltage that (feed through) voltage drop can influence show electrode is always worn in feedback; After when gate driving (gate driver) cabling voltage is next time opened again, thus this feed through voltage for the influence of the GTG of display frame, human eye be can be clear and definite the existence of feeling it.Thus; Find out from the oscillogram that three rank shown in Figure 8 drive; The gate driving voltage produces the grid cut-in voltage, first grid closes voltage and second grid cuts out three kinds of different voltages of voltage; When gate driving (gate driver) when closing, can move voltage to minimum voltage, close voltage and second grid through first grid and close voltage and be implemented in after the gate driver cabling of next bar is also closed by the time; Voltage is retracted, (feed through) voltage is worn in the feedback that Cgd that voltage can compensate next bar line produces that retracts of this moment again.That is to say; When each bar gate driver cabling is closed; Via the feed through voltage that Cgd produced; Be when voltage being retracted, promptly compensate that the storage first grid is closed the variable quantity that voltage and second grid are closed voltage in the CS electric capacity via the feed through voltage that Cs produced by a last cabling.As above principle analysis can be known, in conjunction with principle of charge conservation, can calculate the voltage that retracts:
(VON-VOFF2) * Cgd/ (Cgd+Clc+Cs)=(VOFF1-VOFF2) * Cs/ (Cgd+Clc+Cs); Make and retract voltage Ve=VOFF1-VOFF2=(VON-VOFF2) * Cgd/ (Cs-Cgd); According to principle of charge conservation, can know to present and wear magnitude of voltage Δ V=Ve*Cs/ (Cgd+Clc+Cs).Adopt above-mentioned three rank drive schemes, can very accurately adjust of the influence of feed through voltage for show electrode,
Fig. 9 is the three rank driving sequential chart according to LCD shown in Figure 3.Three rank driving voltage timing diagrams as shown in Figure 9 are worked as STV1=H, and STV2=H is during OE=L; The capable gate cabling of N-1 grid corresponds to VGH, works as STV1=H, and STV2=L is during OE=H; N-1 is capable, and the gate cabling becomes VOFF1, works as STV1=H, and STV2=L is during OE=L; The capable gate cabling of N-1 grid voltage is VOFF2, and at this moment, the capable gate cabling of N grid voltage is VGH, keep the OE high level period time after; When OE is become low level the time by high level, N is capable, and corresponding gate drive voltage becomes VOFF1 by VGH, because the variation of Cgd electric capacity gate terminal voltage causes certain feed through voltage.But this moment; For the capable gate cabling of N-1, grid voltage becomes VOFF1 by VOFF2, and the capable corresponding corresponding voltage of Cs MM CAP of N-1 this moment can change; Principle analysis in conjunction with top can be known; The voltage variety that the variation of the capable grid voltage of N-1 causes Cs electric capacity just waits the variable quantity of the capable grid voltage of N to Cgd voltage, STV1 wherein, and the frequency of STV2 and OE, high-low level dutycycle can be regulated.
Invention provides a kind of scan electrode driving method.Figure 10 is the process flow diagram according to the scan electrode driving method of the embodiment of the invention.Shown in figure 10, this method comprises the steps:
Step S102 is to the circuit voltage processing of boosting, to obtain the grid cut-in voltage.This step can realize through the boosting unit among Fig. 31.
Step S104 carries out step-down to circuit voltage and handles, and closes voltage to obtain grid, and grid is closed voltage and comprised that first grid is closed voltage and second grid cuts out voltage.This step can realize through the pressure unit among Fig. 3 of the present invention 2.
Step S106, control grid cut-in voltage, first grid close the output timing that voltage and second grid are closed voltage.Above-mentioned steps can realize through the drive element of the grid among Fig. 3 of the present invention 3.
The present invention is through adopting gate driver circuit three tunnel driven; Promptly one road grid cut-in voltage (positive polarity voltage), two-way grid are closed voltage (reverse voltage); With respect to two road traditional voltage driving modes; Increased by one tunnel negative polarity driving voltage; The feedback that two-way reverse voltage corresponding electrical circuits produces is worn voltage and can be cancelled out each other, and therefore can not produce the asymmetric phenomenon of positive-negative polarity gray scale voltage, so need not to debug the purpose that common reference voltage also can be realized high image quality.Such scheme has improved the application circuit of liquid crystal panel demonstration GTG quality; Common reference voltage can be regulated and the effect of high image quality can be realized; Saved and used external unit to regulate the operation of common reference voltage; And saved the corresponding periphery circuit design of common reference voltage, practiced thrift cost to a great extent, improved production efficiency.
In the above embodiment of the present invention; Circuit voltage is carried out step-down to be handled; Close voltage to obtain grid; Grid is closed voltage and is comprised that first grid closes voltage and second grid and close the step of voltage and can comprise: through one-level negative electrode discharge cell 21 circuit voltage is reduced by one times, to obtain the one-level negative voltage; Receive this one-level negative voltage through secondary negative electrode discharge cell 23, and this one-level negative voltage is reduced by one times again, close voltage to obtain grid; The grid that gets access to is closed voltage regulate, first grid is closed voltage and second grid cuts out voltage to obtain.
Preferably, can be through high level H and the low level L that the first pulse signal STV1, the second pulse signal STV2 and enable signal OE are set, control grid cut-in voltage, first grid and close the output timing that voltage and second grid are closed voltage; Wherein, Work as STV1=H, STV2=H is during OE=L; Open the capable gate line of N-1, and the grid voltage of controlling the capable gate line of N-1 is grid cut-in voltage Von; Work as STV1=H, STV2=L during OE=H, closes the capable gate line of N-1, and the grid voltage of controlling the capable gate line of N-1 is that first grid is closed voltage VOFF1, and first grid is closed voltage VOFF1 is saved to storage capacitors Cs; Work as STV1=H; STV2=L; During OE=L; The grid voltage of the capable gate line of drive element of the grid 3 control N-1 is that second grid cuts out voltage VOFF2, and the grid voltage of the capable gate line of drive element of the grid 3 control N is grid cut-in voltage Von, and second grid cuts out voltage VOFF2 and grid cut-in voltage Von is saved to storage capacitors Cs; Work as STV1=L, STV2=L is during OE=H; The grid voltage of the capable gate line of drive element of the grid 3 control N-1 is that first grid is closed voltage VOFF1; Retract voltage Ve=VOFF1-VOFF2 to obtain, the grid voltage of the capable gate line of drive element of the grid 3 control N is that second grid cuts out voltage VOFF2, and storage capacitors Cs preserves and retracts voltage Ve; This retracts voltage and can cause the voltage of Cs show electrode end to change; The magnitude of voltage that changes just equals feedback and wears voltage, can calculate feedback according to principle of charge conservation and wear voltage Δ V=Ve*Cs/ (Cgd+Clc+Cs), has therefore solved because the problem of the display effect difference that voltage causes is worn in feedback.
The above-mentioned implementation method of the present invention, concrete is under the situation of VIN at input voltage, behind one-level positive polarity booster circuit; Sequential control C1 through SW discharges and recharges, and voltage can be raised to two times vin, through secondary positive polarity booster circuit; Through discharging and recharging of control C2; Voltage can be raised to three times VIN, through the adjusting by a small margin of positive polarity control circuit, just can reach the output voltage values VGH that needs.In like manner, through one-level negative polarity reduction voltage circuit, control C3 discharges and recharges; Can make the VIN of voltage output negative pole property, through secondary negative polarity circuit, control C4 discharges and recharges; The VIN anti-phase can be made, through the adjusting by a small margin of negative polarity control circuit, just VOFF1 and VOFF2 can be exported again.Because VGH, VOFF1, VOFF2 are higher to the stability requirement of voltage, so increase C5, C6, C7 reach the effect that reduces voltage ripple.Through scheme of the present invention, can accurately adjust the pressure drop that feed through voltage causes, drive with respect to second order; Needn't use external unit debugging common reference; Therefore can simplify the design of common reference circuit, the input that also can save commissioning device is saved very big man power and material.
The present invention also provides a kind of display panels, and this LCD comprises above-mentioned any one scan electrode drive system.
The present invention also provides a kind of LCD, and this LCD comprises the embodiment of above-mentioned any scan electrode drive system, this liquid crystal display displays better effects if, and the user experience sense is higher.
From above embodiment described, can find out that the present invention has realized following technique effect: the present invention had realized the more convenient image quality that improves liquid crystal panel more simply, has reduced cost, has improved user's visual experience.
Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the memory storage and carry out, perhaps they are made into a plurality of integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize by calculation element.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a scan electrode drive system is characterized in that, comprising:
Boosting unit is used for to the circuit voltage processing of boosting, to obtain the grid cut-in voltage;
Pressure unit is used for that said circuit voltage is carried out step-down and handles, and closes voltage to obtain grid, and said grid is closed voltage and comprised that first grid is closed voltage and second grid cuts out voltage;
Drive element of the grid is used to control said grid cut-in voltage, said first grid and closes the output timing that voltage and said second grid are closed voltage.
2. system according to claim 1 is characterized in that,
Said boosting unit comprises:
One-level positive electrode charhing unit doubles said circuit voltage liter, to obtain the first grid cut-in voltage;
Secondary positive electrode charhing unit is connected with said one-level positive electrode charhing unit, said first grid cut-in voltage liter is doubled, to obtain said grid cut-in voltage;
Said pressure unit comprises:
One-level negative electrode discharge cell reduces by one times with said circuit voltage, to obtain the one-level negative voltage;
Secondary negative electrode discharge cell is connected with said one-level negative electrode discharge cell, and said one-level negative voltage is reduced by one times, closes voltage to obtain said grid.
3. system according to claim 2 is characterized in that, said system also comprises:
The positive polarity voltage control module is used to obtain said grid cut-in voltage, and said grid cut-in voltage is regulated;
The reverse voltage control module is used for that the said grid that gets access to is closed voltage and regulates, and said first grid is closed voltage and said second grid cuts out voltage to obtain.
4. system according to claim 3 is characterized in that, said system also comprises:
First filter capacitor, an end are connected on the node of the path between said positive polarity voltage control module and the said drive element of the grid, other end ground connection;
Second filter capacitor, an end are connected on the node of first path between said reverse voltage control module and the said drive element of the grid, other end ground connection, and said first path is used to transmit said first grid and closes voltage;
The 3rd filter capacitor, an end are connected on the node of the alternate path between said reverse voltage control module and the said drive element of the grid, other end ground connection, and said alternate path is used to transmit said second grid and closes voltage.
5. according to each described system among the claim 1-4; It is characterized in that said drive element of the grid comprises timing control unit, be used to be provided with high level H and the low level L of the first pulse signal STV1, the second pulse signal STV2 and enable signal OE; Wherein
Work as STV1=H, STV2=H, during OE=L, the grid voltage that said drive element of the grid is controlled the capable gate line of N-1 is grid cut-in voltage Von;
Work as STV1=H, STV2=L, during OE=H, the grid voltage that said drive element of the grid is controlled the capable gate line of said N-1 is that said first grid is closed voltage VOFF1, and said first grid is closed voltage VOFF1 is saved to storage capacitors Cs;
Work as STV1=H; STV2=L; During OE=L; The grid voltage that said drive element of the grid is controlled the capable gate line of said N-1 is that said second grid cuts out voltage VOFF2, and the grid voltage that said drive element of the grid is controlled the capable gate line of N is said grid cut-in voltage Von, and said second grid cuts out voltage VOFF2 and grid cut-in voltage Von is saved to storage capacitors Cs;
Work as STV1=L, STV2=L is during OE=H; The grid voltage that said drive element of the grid is controlled the capable gate line of said N-1 is that said first grid is closed voltage VOFF1; Retract voltage Ve=VOFF1-VOFF2 to obtain, simultaneously, the grid voltage that said drive element of the grid is controlled the capable gate line of said N is that second grid cuts out voltage VOFF2; Said storage capacitors Cs preserves and retracts voltage Ve, compensates feedback and wears voltage according to the said voltage that retracts.
6. system according to claim 5 is characterized in that, said boosting unit and said pressure unit are built in said drive element of the grid.
7. a scan electrode driving method is characterized in that, comprising:
To the circuit voltage processing of boosting, to obtain the grid cut-in voltage;
Said circuit voltage is carried out step-down handle, close voltage to obtain grid, said grid is closed voltage and is comprised that first grid is closed voltage and second grid cuts out voltage;
Control said grid cut-in voltage, said first grid and close the output timing that voltage and said second grid are closed voltage.
8. method according to claim 7 is characterized in that, said circuit voltage is carried out step-down handle, and closes voltage to obtain grid, and said grid is closed voltage and comprised that first grid closes voltage and second grid and close the step of voltage and comprise:
Through one-level negative electrode discharge cell said circuit voltage is reduced by one times, to obtain the one-level negative voltage;
Secondary negative electrode discharge cell receives said one-level negative voltage, and said one-level negative voltage is reduced by one times again, closes voltage to obtain said grid;
The said grid that gets access to is closed voltage regulate, said first grid is closed voltage and said second grid cuts out voltage to obtain.
9. according to claim 7 or 8 described methods; It is characterized in that; Through high level H and the low level L that the first pulse signal STV1, the second pulse signal STV2 and enable signal OE are set; Control said grid cut-in voltage, said first grid and close the output timing that voltage and said second grid are closed voltage, wherein
Work as STV1=H, STV2=H during OE=L, opens the capable gate line of N-1, and the grid voltage of controlling the capable gate line of said N-1 is grid cut-in voltage Von;
Work as STV1=H, STV2=L during OE=H, closes the capable gate line of said N-1, and the grid voltage of controlling the capable gate line of said N-1 is that said first grid is closed voltage VOFF1, and said first grid is closed voltage VOFF1 is saved to storage capacitors Cs;
Work as STV1=H; STV2=L; During OE=L; The grid voltage that said drive element of the grid is controlled the capable gate line of said N-1 is that said second grid cuts out voltage VOFF2, and the grid voltage that said drive element of the grid is controlled the capable gate line of N is said grid cut-in voltage Von, and said second grid cuts out voltage VOFF2 and grid cut-in voltage Von is saved to storage capacitors Cs;
Work as STV1=L, STV2=L is during OE=H; The grid voltage that said drive element of the grid is controlled the capable gate line of said N-1 is that said first grid is closed voltage VOFF1; Retract voltage Ve=VOFF1-VOFF2 to obtain, simultaneously, the grid voltage that said drive element of the grid is controlled the capable gate line of said N is that second grid cuts out voltage VOFF2; Said storage capacitors Cs preserves the said voltage Ve that retracts, and compensates feedback and wears voltage according to the said voltage that retracts.
10. a LCD is characterized in that, comprises any described scan electrode drive system among the claim 1-6.
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| CN201110085811.2A CN102737590B (en) | 2011-04-06 | 2011-04-06 | scan electrode driving method, system and liquid crystal display |
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| CN201110085811.2A CN102737590B (en) | 2011-04-06 | 2011-04-06 | scan electrode driving method, system and liquid crystal display |
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| CN102737590A true CN102737590A (en) | 2012-10-17 |
| CN102737590B CN102737590B (en) | 2015-09-16 |
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| CN201110085811.2A Active CN102737590B (en) | 2011-04-06 | 2011-04-06 | scan electrode driving method, system and liquid crystal display |
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