CN102737590B - scan electrode driving method, system and liquid crystal display - Google Patents
scan electrode driving method, system and liquid crystal display Download PDFInfo
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Abstract
The invention discloses a kind of scan electrode driving method, system and liquid crystal display.Wherein, this system comprises: boosting unit, for carrying out boosting process to circuit voltage, to obtain gate turn-on voltage; Pressure unit, for carrying out step-down process to circuit voltage, to obtain gate off voltage, gate off voltage comprises first grid and closes voltage and second grid closedown voltage; Drive element of the grid, closes the output timing of voltage for control gate cut-in voltage, first grid closedown voltage and second grid.By the present invention, feedback can be eliminated and wear voltage, make to avoid display display frame to glimmer, improve Consumer's Experience.
Description
Technical field
The present invention relates to appliance field, in particular to a kind of scan electrode driving method, system and liquid crystal display.
Background technology
Along with the increasingly extensive application of liquid crystal display, the demand of high performance-price ratio product is also strengthened day by day, how to improve display quality, reduce costs, enhancing productivity just becomes the problem of the concern of researcher needs and solution.
Existing liquid crystal panel is divided into two kinds of frameworks: one is completed by gate line gate cabling for memory capacitance; Another kind of to be completed by common reference voltage (common) cabling for memory capacitance.Fig. 1 is the structural representation of the liquid crystal molecule of display panels according to correlation technique, as shown in Figure 1, Clc is liquid crystal capacitance, Cs is storage capacitors, Cgd is the stray capacitance between the own grid of TFT (gate) and drain electrode (drain), and one end of storage capacitors Cs is connected on gate line.
Nowadays the liquid crystal display used, gate drivers is substantially all adopt two-way voltage driven, namely gate driver voltage only has two-way, one road grid opens voltage (VON) and a road gate off voltage (VOFF1), because this display panels adopts thin film transistor (TFT) TFT as control element, stray capacitance is had between the grid and drain electrode of thin film transistor (TFT), stray capacitance is very easily subject to the impact of gate drive voltage, and cause the change of current potential on electric capacity, thus the change of show electrode voltage is had influence on by capacitive coupling, the change of this voltage inevitably creates feedback and wears voltage, therefore cause positive-negative polarity gray scale voltage asymmetric, make GTG quality can be poor, affect image quality to a great extent.
Fig. 2 is the second order driver' s timing figure of display panels according to Fig. 1.Drive waveforms figure as shown in Figure 2, in the process that each grid gate opened successively according to the time that pulse high level is corresponding, although second order drives simpler on the drive voltage, but it inevitably produces feedback and wears voltage, so can film flicker be caused, need to regulate common reference voltage VCOM to improve flicker level by external debugging device, so inevitably increase cost.
For above-mentioned prior art due to two-way Voltag driving circuit produce feedback wear voltage, cause positive-negative polarity gray scale voltage asymmetric, display frame glimmered, affect the problem of display effect, not yet propose effective solution at present.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of scan electrode driving method, system and liquid crystal display, with solve prior art due to two-way Voltag driving circuit produce feedback wear voltage, cause positive-negative polarity gray scale voltage asymmetric, display frame is glimmered, affect 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, for carrying out boosting process to circuit voltage, to obtain gate turn-on voltage; Pressure unit, for carrying out step-down process to circuit voltage, to obtain gate off voltage, gate off voltage comprises first grid and closes voltage and second grid closedown voltage; Drive element of the grid, closes the output timing of voltage for control gate cut-in voltage, first grid closedown voltage and second grid.
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: carry out boosting process, to obtain gate turn-on voltage to circuit voltage; Carry out step-down process to circuit voltage, to obtain gate off voltage, gate off voltage comprises first grid and closes voltage and second grid closedown voltage; Control gate cut-in voltage, first grid close the output timing of voltage and second grid closedown voltage.
To achieve these goals, in accordance with a further aspect of the present invention, provide a kind of display panels, this liquid crystal display comprises any one scan electrode drive system above-mentioned.
To achieve these goals, in accordance with a further aspect of the present invention, provide a kind of liquid crystal display, this liquid crystal display comprises any one scan electrode drive system above-mentioned.
By the present invention, adopt boosting unit, for carrying out boosting process to circuit voltage, to obtain gate turn-on voltage; Pressure unit, for carrying out step-down process to circuit voltage, to obtain gate off voltage, gate off voltage comprises first grid and closes voltage and second grid closedown voltage; Drive element of the grid, the output timing of voltage is closed for control gate cut-in voltage, first grid closedown voltage and second grid, what solve prior art wears voltage because two-way Voltag driving circuit produces feedback, cause positive-negative polarity gray scale voltage asymmetric, display frame is glimmered, affects the problem of display effect, reach elimination feedback and wear voltage, make to avoid display display frame to glimmer, improve the effect of Consumer's Experience.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of the liquid crystal molecule of display panels according to correlation technique;
Fig. 2 is the second order driver' s timing figure of display panels according to Fig. 1;
Fig. 3 is the structural representation of the liquid crystal display according to the embodiment of the present invention;
Fig. 4 is the structural representation of the scan electrode drive system of liquid crystal display according to Fig. 3;
Fig. 5 is the detailed construction schematic diagram of the scan electrode drive system of liquid crystal display according to Fig. 3;
Fig. 6 is the electrical block diagram of the scan electrode drive system of liquid crystal display according to Fig. 3;
Fig. 7 is the schematic diagram of the scan electrode drive system of liquid crystal display according to Fig. 3;
Fig. 8 is three rank drive waveforms figure of liquid crystal display according to Fig. 3;
Fig. 9 is three rank driver' s timing figure of liquid crystal display according to Fig. 3; And
Figure 10 is the process flow diagram of the scan electrode driving method according to the embodiment of the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
The invention provides a kind of scan electrode drive system.Fig. 3 is the structural representation of the liquid crystal display according to the embodiment of the present invention; Fig. 4 is the structural representation of the scan electrode drive system of liquid crystal display according to Fig. 3; Fig. 6 is the electrical block diagram of the scan electrode drive system of liquid crystal display according to Fig. 3.
As shown in Figures 3 and 4, this system comprises: scanning electrode drive and gate drivers, and wherein, scanning electrode drive comprises: boosting unit 1, for carrying out boosting process to circuit voltage, to obtain gate turn-on voltage; Pressure unit 2, for carrying out step-down process to circuit voltage, to obtain gate off voltage, gate off voltage comprises first grid and closes voltage and second grid closedown voltage; And gate drivers comprises drive element of the grid 3, close the output timing of voltage for control gate cut-in voltage, first grid closedown voltage and second grid.
The present invention is by adopting three road voltage driven by gate driver circuit, an i.e. road gate turn-on voltage (positive polarity voltage), two-way gate off voltage (reverse voltage), relative to two traditional road voltage driving modes, add a road negative polarity driving voltage, the feedback that the circuit that two-way reverse voltage is corresponding produces is worn voltage and can be cancelled out each other, therefore the asymmetric phenomenon of positive-negative polarity gray scale voltage can not be produced, so the object of high image quality also can be realized without the need to debugging common reference voltage.Such scheme improves the application circuit of liquid crystal panel display GTG quality, common reference voltage can be regulated can to realize the effect of high image quality, eliminate the operation using external unit to regulate common reference voltage, and save periphery circuit design corresponding to common reference voltage, save cost to a great extent, improve production efficiency.
Fig. 5 is the detailed construction schematic diagram of the scan electrode drive system of liquid crystal display according to Fig. 3.As shown in Figure 5, boosting unit 1 in Fig. 4 of the present invention can comprise: one-level positive electrode charhing unit 11, circuit voltage liter is doubled, to obtain 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 gate turn-on voltage; Pressure unit 2 in Fig. 4 of the present invention comprises: one-level negative electrode discharge cell 21, circuit voltage is reduced by one times, to obtain one-level negative voltage; Secondary negative electrode discharge cell 23, is connected with one-level negative electrode discharge cell, one-level negative voltage is reduced by one times, to obtain gate off voltage.
As shown in Figure 4 and Figure 5, present system also comprises control module 4, concrete can the comprising of this control module 4: positive polarity voltage control module 41, for obtaining gate turn-on voltage, and regulates gate turn-on voltage; And reverse voltage control module 42, for regulating the gate off voltage got, close voltage and second grid closedown voltage to obtain first grid.
To sum up shown in Figure 4 and 5, first grid in above-mentioned steps of the present invention closes voltage and second grid closedown voltage can directly be generated by pressure unit 2, then its output timing is controlled by drive element of the grid 3, in addition, can be controlled according to the time by reverse voltage control module 41 and regulate the gate off voltage that pressure unit 2 generates, thus export first grid and close 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, and one end is connected on the node of the path between positive polarity voltage control module 41 and drive element of the grid 3, other end ground connection; Second filter capacitor C6, one end is connected on the node of the first path between reverse voltage control module 42 and drive element of the grid 3, other end ground connection, and the first path closes voltage for transmitting first grid; 3rd filter capacitor C7, one end is connected on the node of the alternate path between reverse voltage control module 42 and drive element of the grid 3, other end ground connection, and alternate path closes voltage for transmitting second grid.Above-mentioned three filter capacitors, for reducing ripple voltage, improve the stability of voltage.
Preferably, the present invention can comprise timing control unit by drive element of the grid 3, for arranging the first pulse signal STV1, the high level H of the second pulse signal STV2 and enable signal OE and low level L, wherein, work as STV1=H, when STV2=H, OE=L, the grid voltage that drive element of the grid 3 controls the capable gate line of N-1 is gate turn-on voltage Von, work as STV1=H, when STV2=L, OE=H, the grid voltage that drive element of the grid 3 controls the capable gate line of N-1 is that first grid closes voltage VOFF1, and first grid is closed voltage VOFF1 and be saved to storage capacitors Cs, work as STV1=H, STV2=L, during OE=L, the grid voltage that drive element of the grid 3 controls the capable gate line of N-1 is that second grid cuts out voltage VOFF2, the grid voltage that drive element of the grid 3 controls N-th row gate line is gate turn-on voltage Von, and second grid cuts out voltage VOFF2 and gate turn-on voltage Von and be saved to storage capacitors Cs, work as STV1=L, STV2=L, during OE=H, the grid voltage that drive element of the grid 3 controls the capable gate line of N-1 is that first grid closes voltage VOFF1, voltage Ve=VOFF1-VOFF2 is retracted to obtain, the grid voltage that drive element of the grid 3 controls N-th row gate line is that second grid cuts out voltage VOFF2, storage capacitors Cs preserves and retracts voltage Ve, this retracts voltage and the voltage of Cs show electrode end can be caused to change, the magnitude of voltage of change just equals feedback and wears voltage, feedback can be calculated according to principle of charge conservation and wear voltage Δ V=Ve*Cs/ (Cgd+Clc+Cs), therefore solve owing to presenting the problem of wearing the display effect difference that voltage causes.
Preferably, scanning electrode drive of the present invention can be integrated into a circuit unit with gate drivers, and the boosting unit 1 namely in the present invention and pressure unit 2 can be built in drive element of the grid 3, but their logic functions are each other independently.
Fig. 7 is the schematic diagram of the scan electrode drive system of liquid crystal display according to Fig. 3; Fig. 8 is three rank drive waveforms figure of liquid crystal display according to Fig. 3.
Concrete, being described in detail as follows with regard to the embodiment of the present invention:
As Figure 4-Figure 6, the present invention utilizes common diode and triode device, is designed by simple rectification circuit, produces three rank driving voltages required for gate drivers easily, for second order drives, adds a road gate off voltage VOFF2.Known in conjunction with the drive waveforms figure shown in systematic schematic diagram as shown in Figure 7 and Fig. 8, open or close at grid (gate) voltage of gate line in a flash, the change of voltage is the fiercest, nearly 30 volts to 40 volts.When Gate cabling is opened, a feedback upwards can be produced and wear voltage and be applied on show electrode.Due to the cause that gate cabling is opened, source (source) electrode of source electrode line can charge to show electrode, even if can produce larger feedback to wear voltage, but correct voltage still can be added on show electrode by source electrode, thus feedback to wear voltage little to show electrode voltage influence.When gate cabling is closed time, the downward pressure drop of a voltage can be produced equally, about there are 30 to 40 volts, but source electrode no longer charges to show electrode, voltage drop just can be applied on show electrode by Cgd stray capacitance, cause show electrode to have the pressure drop of a feed through, thus the gray-level characteristic of image quality can be affected.And the feed through voltage of this feed through voltage when opening unlike gate cabling, only affecting gray-level characteristic instantaneously, because now source drive (source driver) is no longer to show electrode discharge and recharge, therefore the voltage that (feed through) voltage drop can affect show electrode is always worn in feedback, until next time raster data model (gate driver) cabling voltage open again time after, so this feed through voltage is for the impact of the GTG of display frame, human eye is the existence feeling it that can be clear and definite.Thus, the oscillogram driven from three rank shown in Fig. 8 is found out, gate driving voltage produces gate turn-on voltage, first grid closes voltage and second grid cuts out voltage three kinds of different voltages, when raster data model (gate driver) is closed, can voltage be moved to minimum voltage, closing voltage by first grid closedown voltage and second grid realizes after waiting until that the gate driver cabling of next is also closed, again voltage is retracted, now retract voltage can compensate next line Cgd produce feedback wear (feed through) voltage.That is, when each gate driver cabling is closed, the feed through voltage produced via Cgd, when voltage being retracted by a upper cabling, namely the feed through voltage produced via Cs compensates, and stores the variable quantity that first grid closes voltage and second grid closedown voltage in CS electric capacity.As above principle analysis is known, in conjunction with principle of charge conservation, can calculate the voltage retracted:
(VON-VOFF2) * Cgd/ (Cgd+Clc+Cs)=(VOFF1-VOFF2) * Cs/ (Cgd+Clc+Cs), make to retract voltage Ve=VOFF1-VOFF2=(VON-VOFF2) * Cgd/ (Cs-Cgd), according to principle of charge conservation, magnitude of voltage Δ V=Ve*Cs/ (Cgd+Clc+Cs) is worn in known feedback.Adopt above-mentioned three rank drive schemes, very accurately can adjust the impact of feed through voltage for show electrode,
Fig. 9 is three rank driver' s timing figure of liquid crystal display according to Fig. 3.Three rank driving voltage timing diagrams as shown in Figure 9, work as STV1=H, STV2=H, during OE=L, N-1 capable gate cabling grid corresponds to VGH, work as STV1=H, STV2=L, during OE=H, N-1 is capable, and gate cabling becomes VOFF1, work as STV1=H, STV2=L, during OE=L, N-1 capable gate cabling grid voltage is VOFF2, now, N capable gate cabling grid voltage is VGH, after maintaining the OE high level period time, when OE becomes low level from high level time, N is capable, and corresponding gate drive voltage becomes VOFF1 from VGH, due to the change of Cgd capacitive gate terminal voltage, cause certain feed through voltage.But now, for the capable gate cabling of N-1, grid voltage becomes VOFF1 from VOFF2, the voltage that now the capable corresponding Cs memory capacitance of N-1 is corresponding can change, known in conjunction with principle analysis above, the change of the capable grid voltage of N-1 just waits the capable grid voltage of N to the variable quantity of Cgd voltage to the voltage variety that Cs electric capacity causes, and frequency, the low and high level dutycycle of wherein STV1, STV2 and OE can regulate.
Invention provides a kind of scan electrode driving method.Figure 10 is the process flow diagram of the scan electrode driving method according to the embodiment of the present invention.As shown in Figure 10, the method comprises the steps:
Step S102, carries out boosting process, to obtain gate turn-on voltage to circuit voltage.This step can be realized by the boosting unit 1 in Fig. 3.
Step S104, carries out step-down process to circuit voltage, and to obtain gate off voltage, gate off voltage comprises first grid and closes voltage and second grid closedown voltage.This step can be realized by the pressure unit 2 in Fig. 3 of the present invention.
Step S106, control gate cut-in voltage, first grid close the output timing of voltage and second grid closedown voltage.Above-mentioned steps can be realized by the drive element of the grid 3 in Fig. 3 of the present invention.
The present invention is by adopting three road voltage driven by gate driver circuit, an i.e. road gate turn-on voltage (positive polarity voltage), two-way gate off voltage (reverse voltage), relative to two traditional road voltage driving modes, add a road negative polarity driving voltage, the feedback that the circuit that two-way reverse voltage is corresponding produces is worn voltage and can be cancelled out each other, therefore the asymmetric phenomenon of positive-negative polarity gray scale voltage can not be produced, so the object of high image quality also can be realized without the need to debugging common reference voltage.Such scheme improves the application circuit of liquid crystal panel display GTG quality, common reference voltage can be regulated can to realize the effect of high image quality, eliminate the operation using external unit to regulate common reference voltage, and save periphery circuit design corresponding to common reference voltage, save cost to a great extent, improve production efficiency.
In the above embodiment of the present invention, step-down process is carried out to circuit voltage, to obtain gate off voltage, the step that gate off voltage comprises first grid closedown voltage and second grid closedown voltage can comprise: by one-level negative electrode discharge cell 21, circuit voltage is reduced by one times, to obtain one-level negative voltage; Receive this one-level negative voltage by secondary negative electrode discharge cell 23, and this one-level negative voltage is reduced by one times, again to obtain gate off voltage; The gate off voltage got is regulated, closes voltage and second grid closedown voltage to obtain first grid.
Preferably, can by arranging the first pulse signal STV1, the high level H of the second pulse signal STV2 and enable signal OE and low level L, carry out control gate cut-in voltage, first grid closes voltage and the output timing of second grid closedown voltage, wherein, work as STV1=H, when STV2=H, OE=L, open the capable gate line of N-1, and the grid voltage controlling the capable gate line of N-1 is gate turn-on voltage Von, work as STV1=H, when STV2=L, OE=H, close the capable gate line of N-1, the grid voltage controlling the capable gate line of N-1 is that first grid closes voltage VOFF1, and first grid is closed voltage VOFF1 and be saved to storage capacitors Cs, work as STV1=H, STV2=L, during OE=L, the grid voltage that drive element of the grid 3 controls the capable gate line of N-1 is that second grid cuts out voltage VOFF2, the grid voltage that drive element of the grid 3 controls N-th row gate line is gate turn-on voltage Von, and second grid cuts out voltage VOFF2 and gate turn-on voltage Von and be saved to storage capacitors Cs, work as STV1=L, STV2=L, during OE=H, the grid voltage that drive element of the grid 3 controls the capable gate line of N-1 is that first grid closes voltage VOFF1, voltage Ve=VOFF1-VOFF2 is retracted to obtain, the grid voltage that drive element of the grid 3 controls N-th row gate line is that second grid cuts out voltage VOFF2, storage capacitors Cs preserves and retracts voltage Ve, this retracts voltage and the voltage of Cs show electrode end can be caused to change, the magnitude of voltage of change just equals feedback and wears voltage, feedback can be calculated according to principle of charge conservation and wear voltage Δ V=Ve*Cs/ (Cgd+Clc+Cs), therefore solve owing to presenting the problem of wearing the display effect difference that voltage causes.
The above-mentioned implementation method of the present invention, it is concrete when input voltage is VIN, after one-level positive polarity booster circuit, by the discharge and recharge of the sequential control C1 of SW, voltage can be raised to the vin of two times, through secondary positive polarity booster circuit, by the discharge and recharge of control C2, voltage can be raised to the VIN of three times, by the adjustment by a small margin of positive polarity control circuit, just can reach the output voltage values VGH of needs.In like manner, by one-level negative polarity reduction voltage circuit, the discharge and recharge of control C3, the VIN of voltage output negative pole can be made, by secondary negative polarity circuit, the discharge and recharge of control C4, VIN can be made anti-phase, then pass through the adjustment by a small margin of negative polarity control circuit, just can export VOFF1 and VOFF2.Because VGH, VOFF1, VOFF2 stability requirement to voltage is higher, therefore increase the effect that C5, C6, C7 reach reduction voltage ripple.By the solution of the present invention, accurately can adjust the pressure drop that feed through voltage causes, drive relative to second order, external unit need not be used to debug common reference, therefore can simplify the design of common reference circuit, also can save the input of commissioning device, save very large man power and material.
Present invention also offers a kind of display panels, this liquid crystal display comprises any one scan electrode drive system above-mentioned.
Present invention also offers a kind of liquid crystal display, this liquid crystal display comprises the embodiment of any one scan electrode drive system above-mentioned, and this liquid crystal display display effect is better, and Consumer's Experience sense is higher.
From above embodiment describes, can find out, present invention achieves following technique effect: present invention achieves the more convenient image quality improving liquid crystal panel more simply, reduce cost, improve user's visual experience.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, or they are made into multiple integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a scan electrode drive system, is characterized in that, comprising:
Boosting unit, for carrying out boosting process to circuit voltage, to obtain gate turn-on voltage;
Pressure unit, for carrying out step-down process to described circuit voltage, to obtain gate off voltage, described gate off voltage comprises first grid and closes voltage and second grid closedown voltage;
Drive element of the grid, for controlling described gate turn-on voltage, described first grid closes voltage and the output timing of described second grid closedown voltage;
Described boosting unit comprises: one-level positive electrode charhing unit, is doubled by described circuit voltage liter, to obtain first grid cut-in voltage; Secondary positive electrode charhing unit, is connected with described one-level positive electrode charhing unit, doubles, described first grid cut-in voltage liter to obtain described gate turn-on voltage; Described pressure unit comprises: one-level negative electrode discharge cell, and described circuit voltage is reduced by one times, to obtain one-level negative voltage; Secondary negative electrode discharge cell, is connected with described one-level negative electrode discharge cell, described one-level negative voltage is reduced by one times, to obtain described gate off voltage;
Wherein, described system also comprises: positive polarity voltage control module, for obtaining described gate turn-on voltage, and regulates described gate turn-on voltage; Reverse voltage control module, for regulating the described gate off voltage got, closes voltage and described second grid closedown voltage to obtain described first grid;
Wherein, described system also comprises: the first filter capacitor, and one end is connected on the node of the path between described positive polarity voltage control module and described drive element of the grid, other end ground connection; Second filter capacitor, one end is connected on the node of the first path between described reverse voltage control module and described drive element of the grid, other end ground connection, and described first path closes voltage for transmitting described first grid; 3rd filter capacitor, one end is connected on the node of the alternate path between described reverse voltage control module and described drive element of the grid, other end ground connection, and described alternate path closes voltage for transmitting described second grid.
2. system according to claim 1, is characterized in that, described drive element of the grid comprises timing control unit, for arranging the first pulse signal STV1, the high level H of the second pulse signal STV2 and enable signal OE and low level L, wherein,
Work as STV1=H, when STV2=H, OE=L, the grid voltage that described drive element of the grid controls the capable gate line of N-1 is gate turn-on voltage Von;
Work as STV1=H, when STV2=L, OE=H, the grid voltage that described drive element of the grid controls the capable gate line of described N-1 is that described first grid closes voltage VOFF1, and described first grid closedown voltage VOFF1 is saved to storage capacitors Cs;
Work as STV1=H, STV2=L, during OE=L, the grid voltage that described drive element of the grid controls the capable gate line of described N-1 is that described second grid cuts out voltage VOFF2, the grid voltage that described drive element of the grid controls N-th row gate line is described gate turn-on voltage Von, and described second grid closedown voltage VOFF2 and gate turn-on voltage Von is saved to storage capacitors Cs;
Work as STV1=L, STV2=L, during OE=H, the grid voltage that described drive element of the grid controls the capable gate line of described N-1 is that described first grid closes voltage VOFF1, retract voltage Ve=VOFF1-VOFF2 to obtain, meanwhile, the grid voltage that described drive element of the grid controls described N-th row gate line is that second grid cuts out voltage VOFF2, described storage capacitors Cs preserves and retracts voltage Ve, compensates feedback wear voltage according to the described voltage that retracts.
3. system according to claim 2, is characterized in that, described boosting unit and described pressure unit are built in described drive element of the grid.
4. a scan electrode driving method, is characterized in that, comprising:
Boosting process is carried out, to obtain gate turn-on voltage to circuit voltage;
Carry out step-down process to described circuit voltage, to obtain gate off voltage, described gate off voltage comprises first grid and closes voltage and second grid closedown voltage;
Control described gate turn-on voltage, described first grid closes voltage and the output timing of described second grid closedown voltage;
Step-down process is carried out to described circuit voltage, to obtain gate off voltage, the step that described gate off voltage comprises first grid closedown voltage and second grid closedown voltage comprises: by one-level negative electrode discharge cell, described circuit voltage is reduced by one times, to obtain one-level negative voltage; Secondary negative electrode discharge cell receives described one-level negative voltage, and described one-level negative voltage is reduced by one times again, to obtain described gate off voltage; The described gate off voltage got is regulated, closes voltage and described second grid closedown voltage to obtain described first grid;
Wherein, control described gate turn-on voltage by drive element of the grid, described first grid closes voltage and the output timing of described second grid closedown voltage;
Wherein, described method also comprises: obtain described gate turn-on voltage by positive polarity voltage control module, and regulates described gate turn-on voltage; By reverse voltage control module, the described gate off voltage got is regulated, close voltage and described second grid closedown voltage to obtain described first grid;
Wherein, described method also comprises: be connected on the node of the path between described positive polarity voltage control module and described drive element of the grid by first filter capacitor one end, other end ground connection; Second filter capacitor one end is connected on the node of the first path between described reverse voltage control module and described drive element of the grid, other end ground connection, and described first path closes voltage for transmitting described first grid; 3rd filter capacitor, one end is connected on the node of the alternate path between described reverse voltage control module and described drive element of the grid, other end ground connection, and described alternate path closes voltage for transmitting described second grid.
5. method according to claim 4, it is characterized in that, by arranging the first pulse signal STV1, the high level H of the second pulse signal STV2 and enable signal OE and low level L, control described gate turn-on voltage, described first grid closes voltage and the output timing of described second grid closedown voltage, wherein
Work as STV1=H, when STV2=H, OE=L, open the capable gate line of N-1, and the grid voltage controlling the capable gate line of described N-1 is gate turn-on voltage Von;
Work as STV1=H, when STV2=L, OE=H, close the capable gate line of described N-1, and the grid voltage controlling the capable gate line of described N-1 is described first grid closedown voltage VOFF1, and described first grid closedown voltage VOFF1 is saved to storage capacitors Cs;
Work as STV1=H, STV2=L, during OE=L, the grid voltage that described drive element of the grid controls the capable gate line of described N-1 is that described second grid cuts out voltage VOFF2, the grid voltage that described drive element of the grid controls N-th row gate line is described gate turn-on voltage Von, and described second grid closedown voltage VOFF2 and gate turn-on voltage Von is saved to storage capacitors Cs;
Work as STV1=L, STV2=L, during OE=H, the grid voltage that described drive element of the grid controls the capable gate line of described N-1 is that described first grid closes voltage VOFF1, retract voltage Ve=VOFF1-VOFF2 to obtain, meanwhile, the grid voltage that described drive element of the grid controls described N-th row gate line is that second grid cuts out voltage VOFF2, described storage capacitors Cs retracts voltage Ve described in preserving, and compensates feedback wear voltage according to the described voltage that retracts.
6. a liquid crystal display, is characterized in that, comprises the scan electrode drive system in claim 1-3 described in any one.
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| CN103177682B (en) | 2013-03-26 | 2015-05-13 | 京东方科技集团股份有限公司 | Display drive circuit and drive method thereof as well as display device |
| CN103745706B (en) * | 2013-12-31 | 2016-01-06 | 深圳市华星光电技术有限公司 | The array base palte horizontal drive circuit that three rank drive |
| CN103886846B (en) * | 2014-03-13 | 2016-05-18 | 京东方科技集团股份有限公司 | A kind of control method of gated sweep signal and liquid crystal display |
| JP2016192665A (en) * | 2015-03-31 | 2016-11-10 | ラピスセミコンダクタ株式会社 | Semiconductor device |
| CN109389924B (en) * | 2017-08-07 | 2020-08-18 | 京东方科技集团股份有限公司 | Driving circuit for display panel, driving method thereof and display panel |
| CN107300815B (en) * | 2017-08-14 | 2020-06-05 | 深圳市华星光电技术有限公司 | Array substrate, liquid crystal display panel and dot inversion driving method thereof |
| CN110706668A (en) * | 2019-09-18 | 2020-01-17 | 深圳市华星光电技术有限公司 | GOA circuit driving system and display device |
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| KR101294321B1 (en) * | 2006-11-28 | 2013-08-08 | 삼성디스플레이 주식회사 | Liquid crystal display |
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| CN101944344B (en) * | 2010-09-09 | 2012-12-26 | 昆山龙腾光电有限公司 | Grid drive circuit |
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