CN100373439C - Driving method and circuit for liquid crystal display - Google Patents
Driving method and circuit for liquid crystal display Download PDFInfo
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- CN100373439C CN100373439C CNB031573630A CN03157363A CN100373439C CN 100373439 C CN100373439 C CN 100373439C CN B031573630 A CNB031573630 A CN B031573630A CN 03157363 A CN03157363 A CN 03157363A CN 100373439 C CN100373439 C CN 100373439C
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Abstract
The present invention relates to a driving method for a liquid crystal display, particularly to a driving method which is relative with liquid crystal polarity inversion. The known driving modes, such as, a driving method of reference potential inversion (regarded as Vcom inversion or common toggle) which is derived to reduce power consumption, are not applicable to a self-aligned manufacturing procedure so that the purpose of reducing the power consumption and decreasing the size of a transistor simultaneously can not be achieved. Consequently, the purpose of the present invention is to provide the driving method in which liquid crystal capacitance in pixels and the joint reference potential of storage capacitors are respectively changed so as to be supplied to different alternating current signals. The driving mode with the inversion of the reference potential can be applied to a self-aligned manufacturing procedure, and the power consumption can be reduced so as to correct the defects of the existing driving methods.
Description
Technical field
The invention relates to a kind of driving method and driving circuit thereof of LCD, and particularly relevant for a kind of driving method and driving circuit thereof of liquid crystal reversal of poles of LCD.
Background technology
The type of drive of known active LCD, for example picture frame reversal of poles (frameinversion), row reversal of poles (column inversion), row reversal of poles (row inversion) and some reversal of poles (dot inversion) or the like mode.According to the demand of different image qualities, power consumption and driving complexity, and select one.Though picture frame reversal of poles is the simplest, the image quality of its generation is the poorest, so more seldom adopt.Point reversal of poles can produce best image quality, but the complexity of its power consumption and driving also relatively significantly improves.Under the less demanding situation of image quality, the type of drive of row reversal of poles and row reversal of poles then is compromise method.
Fig. 1 illustrates the equivalent electrical circuit of known active liquid crystal display-driving pixel method.Sweep signal among the figure (scan signal) VS102 connects the gate of transistor 110 to control its path or closed circuit.Signal of video signal (data signal) VD104 is connected in the source electrode of transistor 110.When transistor 110 is channel status, signal of video signal 104 will get a builtin voltage 112 (being the magnitude of voltage V1c in the icon) by this transistor 110.Builtin voltage 112 is stored in storage capacitors 130 (being the capacitor C st in the icon) and liquid crystal capacitance 120 (being the capacitor C 1c in the icon).Poor by builtin voltage 112 with the current potential (being the dc voltage value Vcom in the icon) of direct current signal 106, and the liquid crystal angle in the driving liquid crystal capacitance 120.When transistor 110 is closed circuit state, driving liquid crystal capacitance 120 required potential difference (PD) will be continued to provide by storage capacitors 130.
Fig. 2 is based on aforementioned various reversal of poles driving methods, and cooperating Fig. 1 equivalent electrical circuit is example, illustrates further the sequential relationship of each drive signal.Please refer to Fig. 2, direct current signal (Vcom) 206 is a reference voltage.When sweep signal (VS) 202 is noble potential, make signal of video signal (VD) 204 import a pixel inside, and to aforesaid storage capacitors 130 and liquid crystal capacitance 120 chargings.Because of electric capacity charging, make builtin voltage 212 be kept a burning voltage, and then provide foregoing liquid crystal electric capacity 120 required potential difference (PD) 210.
Aforesaid reversal of poles type of drive, because this signal of video signal is done reversal of poles after must writing pixel each time, therefore high voltage amplitude and reversal frequency makes consumed power significantly improve.For reducing consumed power, generally its type of drive can be made an amendment slightly, and the type of drive of adopting reference potential counter-rotating (Vcominversion, or title common toggle).The amplitude of voltage when this type of drive can significantly reduce the signal of video signal counter-rotating, the power consumption in the time of therefore can reducing the display running.
The pixel equivalent circuit of Fig. 2 explanation changing reference potential inversion driving mode of adopting known active LCD.The gate that sweep signal 302 connects transistor 310 among the figure is to control its path or closed circuit, and signal of video signal 304 is connected in the source electrode of transistor 310.When transistor 310 was channel status, signal of video signal 304 got a builtin voltage 312 by it.Builtin voltage 312 is stored in storage capacitors 330 and liquid crystal capacitance 320.Storage capacitors 330 is connected the drain of transistor 310 with first end of liquid crystal capacitance 320, storage capacitors 330 is connected AC signal 306 jointly with second end (common electrode) of liquid crystal capacitance 320.By the potential difference (PD) of builtin voltage 312 with AC signal 306, and the liquid crystal angle in the driving liquid crystal capacitance 320.When transistor 310 is closed circuit state, liquid crystal capacitance 320 required potential difference (PD) will be continued to provide by storage capacitors 330.
Fig. 4 is based on above-mentioned reference current potential inversion driving method, and cooperating Fig. 2 equivalent electrical circuit is example, illustrates further the sequential relationship of each drive signal.Please refer to Fig. 4, drive the required reference voltage of liquid crystal and change AC signal (Vcom) 406 into.When sweep signal (VS) 402 is noble potential, make signal of video signal (VD) 404 import a pixel inside, and to aforesaid storage capacitors 330 and liquid crystal capacitance 320 chargings, and get builtin voltage 412.By builtin voltage 412 and AC signal 406, get a driving liquid crystal potential difference (PD) 410 and act on the foregoing liquid crystal electric capacity 320.
Can reduce the amplitude of signal of video signal 404 according to the driving method of above-mentioned reference current potential counter-rotating, and then reduce consumed power.Yet because of the common electrode (commonelectrode) of liquid crystal capacitance 320 and storage capacitors 330 is connected to same current potential, if storage capacitors 330 is one to have the asymmetric electric capacity of polarity, the driving method of above-mentioned reference current potential counter-rotating can't use.
Along with the progress of process technique, and thin film transistor (TFT) (Thin Film Transistor, size TFT) will be dwindled thereupon, and this moment, the requirement of alignment accuracy just improved relatively.Therefore traditional optical contraposition mode will not applied requiredly, and must adopt the processing procedure mode of self-aligned (self-aligned) to reach.Yet, when using the processing procedure mode of self-aligned, though can improve the performance of thin film transistor (TFT), relatively will cause between gate electrode and polysilicon (polycrystalline silicon) electrode formed storage capacitors is one to have the asymmetric electric capacity (as shown in Figure 8) of polarity.Therefore, the driving method of known reference potential counter-rotating can't be suitable for, and can't reach the purpose that reduces power consumption.
Summary of the invention
Therefore the object of the present invention is to provide a kind of type of drive of LCD, the type of drive of reference potential counter-rotating can be applied in the processing procedure of self-aligned, power consumption in the time of dwindling simultaneously transistor size and reduce the display running is to correct the shortcoming of known driving method.
The present invention proposes a kind of driving method of LCD, and this LCD is made up of a plurality of pixels (pixel), in each pixel, has a transistor, a liquid crystal capacitance and a storage capacitors respectively.The method changes the liquid crystal capacitance in the known pixel and the common reference current potential of storage capacitors into and supplies with two kinds of different AC signal respectively.These two kinds of AC signal are synchronous, and the latter is than the former a big direct current displacement (DC offset) voltage.The method that the present invention proposes comprises: in pixel, provide one scan signal, a signal of video signal, one first AC signal and one second AC signal respectively 1..2 impose sweep signal in this transistor, with the open and close of oxide-semiconductor control transistors.3. wherein when transistor during in opening, impose signal of video signal in first end of liquid crystal capacitance and first end of storage capacitors, wherein liquid crystal capacitance couples mutually with first end of storage capacitors.4. impose first AC signal and second AC signal respectively in second end of liquid crystal capacitance and second end of storage capacitors, wherein first AC signal and second AC signal are synchronous, and second AC signal is greatly more always than first AC signal voltage that drifts.5. transistor is when channel status, and signal of video signal is imported pixel and storage capacitors and liquid crystal capacitance are charged, and gets builtin voltage, and then drives liquid crystal.Transistor is when closed circuit state, and builtin voltage is continued to provide by storage capacitors, drives the liquid crystal potential difference (PD) and keep, to continue to drive the liquid crystal of pixel.
According to the driving method of the described LCD of a preferred embodiment of the present invention, wherein direct current shift voltage value is at least greater than storage capacitors critical voltage value and the peaked summation of driving liquid crystal potential difference (PD).The critical voltage value of the equivalent thin film transistor (TFT) of storage capacitors can be by for example adjusting the change of its doping (doping) amount, to reduce this direct current shift voltage.Select among the embodiment one in addition, the critical voltage value of the equivalent thin film transistor (TFT) of this storage capacitors more can be different with the critical voltage value of the thin film transistor (TFT) of controlling pixel switch.
The present invention proposes a kind of driving circuit of LCD in addition, cooperates aforesaid driving method.Wherein this LCD is made up of most pixels (pixel), and each pixel is put a liquid crystal display drive circuit, and this liquid crystal display drive circuit comprises: a transistor, a liquid crystal capacitance and a storage capacitors.Wherein transistorized gate connects sweep signal, and transistorized source electrode connects signal of video signal.First end of liquid crystal capacitance connects transistorized drain, and second end of liquid crystal capacitance connects first AC signal.Fill out with liquid crystal the transmittance that changes this liquid crystal according to first end and the voltage difference between second end of liquid crystal capacitance in the liquid crystal capacitance.First end of storage capacitors connects transistorized drain, and second end of liquid crystal capacitance connects second AC signal.
According to the driving circuit of the described LCD of another preferred embodiment of the present invention, wherein (thin filmtransistor TFT) implements this transistor with a thin film transistor (TFT).In addition, formed storage capacitors more can self-aligned (self-aligned) process technique apply between gate electrode and the polysilicon electrode, and is one the asymmetric electric capacity of polarity to be arranged.
The driving method of LCD of the present invention is because of adopting different AC signal, the liquid crystal capacitance reference voltage different with storage capacitors in one pixel is provided respectively, for keeping the voltage difference on storage capacitors and the liquid crystal capacitance, two AC signal are synchronously necessary and amplitude is identical.Other is connected to the AC signal many direct current displacement voltages of the AC signal of storage capacitors than liquid crystal capacitance, makes storage capacitors maintain a maximum value.So, corrected the shortcoming of known driving method, and can be adopted the processing procedure of self-aligned and cpable of lowering power consumption.
Description of drawings
Fig. 1 is the equivalent circuit diagram of known driving one pixel.
Fig. 2 is known based on various reversal of poles driving methods and cooperate Fig. 1 that the sequential chart of each drive signal is described.
Fig. 2 changes the pixel equivalent circuit figure that adopts known reference potential inversion driving mode.
Fig. 4 is based on known reference potential inversion driving method and cooperates Fig. 2 that the sequential chart of each drive signal is described.
Fig. 5 is driving method and the driving circuit according to LCD of the present invention, in the liquid crystal display drive circuit of the preferred embodiment that is provided, and the equivalent circuit diagram of a pixel wherein.
Fig. 6 is the driving method according to preferred embodiment of the present invention, and cooperates Fig. 5 that the sequential chart of each drive signal is described.
Fig. 7 is according to the driving method of LCD of the present invention and the preferred embodiment that driving circuit is enumerated.Shown in the figure the wherein driving circuit of a pixel of LCD, with reference to the practical circuit diagram that Fig. 5 finished.
Fig. 8 is driving method and the driving circuit according to LCD of the present invention, the preferred embodiment that is provided.Show the terminal voltage of storage capacitors and the graph of a relation of permittivity among the figure, and in processing procedure different dopings to the properties influence of storage capacitors.
Graphic description of symbols:
102,202,302,402,502,602 sweep signals
104,204,304,404,504,604: signal of video signal
106,206: direct current signal
110,310,510: transistor
112,212,312,412,512,612: builtin voltage
120,320,520: liquid crystal capacitance
130,330,530: storage capacitors
210,410,610: the potential difference (PD) that drives liquid crystal
306,406: AC signal
506,606: first AC signal
508,608: second AC signal
620: the potential difference (PD) of storage capacitors
630: the direct current displacement voltage
81: change the preceding critical voltage of doping
82: change the preceding storage capacitors family curve of doping
83: the storage capacitors family curve after the change doping
84: the critical voltage after the change doping
Embodiment
For above and other objects of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail below:
Please refer to Fig. 5, it illustrates a kind of figure according to a preferred embodiment of the present invention.This figure illustrates in the liquid crystal display-driving mode of the present invention, wherein the equivalent electrical circuit of a pixel.Sweep signal among the figure (being the signal VS in the icon) 502 connects the gate of transistor 510 to control its path or closed circuit.Signal of video signal (being the signal VD in the icon) 504 is connected in the source electrode of transistor 510.When transistor 510 was channel status, signal of video signal 504 got a builtin voltage 512 (being the magnitude of voltage Vlc in the icon) by it.Builtin voltage 512 is stored in storage capacitors (being the capacitor C st in the icon) 530 and liquid crystal capacitance (being the capacitor C lc in the icon) 520.Storage capacitors 530 is connected the drain of transistor 510 with first end of liquid crystal capacitance 520.Second end of storage capacitors 530 is connected to second AC signal (V2) 508, and second end of liquid crystal capacitance 520 connects first AC signal (V1) 506.The oscillogram of Lower Half promptly illustrates the sequential relationship between first AC signal (V1) and second AC signal (V2) among the figure.In the present embodiment, first AC signal (V1) is all identical with amplitude of vibration (Vb), frequency and the phase place of second AC signal (V2), and second AC signal (V2) is than the many direct current displacement voltages (Va) of first AC signal (V1).This direct current displacement voltage value (Va) must be at least drives the peaked summation of liquid crystal potential difference (PD) greater than the critical voltage value of the equivalent thin film transistor (TFT) of storage capacitors 530 and this.By the potential difference (PD) of the builtin voltage 512 and first AC signal 506, and the liquid crystal angle in the driving liquid crystal capacitance 520.When transistor 510 is closed circuit state, liquid crystal capacitance 520 required potential difference (PD) will be continued to provide by storage capacitors 530.
Fig. 6 is based on driving method of the present invention, and cooperating Fig. 5 equivalent electrical circuit is example, illustrates further the sequential relationship of each drive signal.Fig. 7 is with reference to the equivalent electrical circuit of Fig. 5 and the driving method of Fig. 6, enumerates a specific embodiment according to liquid crystal display drive circuit of the present invention.Please refer to Fig. 6, drive the required potential difference (PD) 610 of liquid crystal, provided by the potential difference (PD) of the builtin voltage 612 and first AC signal 606.When sweep signal (VS) 602 is noble potential, make signal of video signal (VD) 604 import a pixel inside, and to aforesaid storage capacitors 530 and liquid crystal capacitance 520 chargings.After 520 chargings of storage capacitors 530 and liquid crystal capacitance, builtin voltage 612, and then provide foregoing liquid crystal electric capacity 520 required potential difference (PD) 610.Again because second AC signal (V2) 608 than first AC signal (V1) more than 606 one direct current displacement voltages 630.In a preferred embodiment, select the value of this direct current displacement voltage 630, can make this direct current displacement voltage 630 at least greater than the critical voltage value and the summation that drives liquid crystal potential difference (PD) 610 maximum voltage value of the equivalent thin film transistor (TFT) of storage capacitors 530.So secondary signal 608 is able to greater than builtin voltage 612 1 storage capacitors potential difference (PD) 620, and makes storage capacitors 530 keep same polar orientation and keep an electric capacity maximum value.Aforementioned first AC signal 606 and second AC signal 608 need to cooperate the sequential of current potential counter-rotating and synchronously, and the amplitude need are identical, just can make the cross-pressure on the liquid crystal capacitance keep a stationary value.So driving method of the present invention is suitable for the self-aligned processing procedure.
According to a preferred embodiment of the present invention, the critical voltage value of the equivalent thin film transistor (TFT) of storage capacitors can be by for example adjusting the change of its doping (doping) amount, to reduce this direct current shift voltage.Fig. 8 is the both end voltage difference of storage capacitors and the graph of a relation of its permittivity.The electric capacity that shows storage capacitors among the figure forms nonlinearities change with its terminal voltage of person.With curve 82 is example, and its terminal voltage must just be able to stored voltage greater than critical voltage 81.Be the voltage of reduction driving circuit, and then reduce power consumption, can be at this by changing doping to reach the purpose that reduces power consumption.The storage capacitors family curve that curve 82 expressions originally had a certain doping, after changing its doping, curve 82 is moved to the left, and gets a new features curve 83.In this simultaneously, original critical voltage 81 also is reduced to new critical voltage 84.Select among the embodiment one, if according to the needs in the design, the critical voltage value of the equivalent thin film transistor (TFT) of this storage capacitors can be set at negative value.Select among the embodiment one in addition, the critical voltage value of the equivalent thin film transistor (TFT) of this storage capacitors more can be different with the critical voltage value of the thin film transistor (TFT) of controlling pixel switch.
Method of the present invention provides the liquid crystal capacitance reference voltage different with storage capacitors in the pixel respectively because of adopting different AC signal, therefore makes discharging and recharging of storage capacitors be maintained certain polarity.These AC signal adopt in this embodiment synchronously and amplitude identical, other is connected to the AC signal many direct current displacement voltages of the AC signal of storage capacitors than liquid crystal capacitance.So, corrected the shortcoming of known driving method, and can be applicable to the processing procedure of self-aligned and cpable of lowering power consumption.
Though the present invention discloses as above with a preferred embodiment; right its is not in order to limiting the present invention, anyly has the knack of this skill person, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the accompanying Claim person of defining.
Claims (8)
1. the driving method of a LCD, wherein this LCD is made up of a plurality of pixel, and each this pixel comprises a transistor, a storage capacitors, a liquid crystal capacitance, and this driving method comprises:
Impose the one scan signal in this transistor, with these transistorized open and close of control, wherein when this transistor during in an opening,
Impose a signal of video signal in one first end of this liquid crystal capacitance and one first end of this storage capacitors, wherein these first ends couple mutually;
Impose one first AC signal and one second AC signal one second end respectively with respect to first end of this storage capacitors with respect to one second end of first end of this liquid crystal capacitance and this storage capacitors in this liquid crystal capacitance, wherein this first AC signal and this second AC signal are synchronous, and this second AC signal is greatly more always than this first AC signal voltage that drifts.
2. the driving method of LCD as claimed in claim 1, wherein this first AC signal is identical with the amplitude of this second AC signal.
3. the driving method of LCD as claimed in claim 2, wherein this direct current shift voltage value drives the peaked summation of liquid crystal potential difference (PD) greater than a critical voltage value of an equivalent thin film transistor (TFT) of this storage capacitors and this at least.
4. the driving method of LCD as claimed in claim 3, wherein this critical voltage value of this equivalence thin film transistor (TFT) of this storage capacitors can be by adjusting its doping change, to reduce this direct current shift voltage.
5. the driving method of LCD as claimed in claim 3, wherein the critical voltage value of this storage capacitors more can be different with this transistor.
6. the driving circuit of a LCD, wherein this LCD is made up of a plurality of pixel, and each this pixel arrangement has a liquid crystal display drive circuit, and this liquid crystal display drive circuit comprises:
One transistor, this transistorized gate connects the one scan signal, and this transistorized one source pole connects a signal of video signal;
One liquid crystal capacitance, one first end of this liquid crystal capacitance connects this transistorized drain, one second end that this liquid crystal capacitance corresponds to this first end connects one first AC signal, fill out in this liquid crystal capacitance with a liquid crystal, change a transmittance of this liquid crystal according to the voltage difference between this first end and this second end; And
One storage capacitors, one first end of this storage capacitors connects this transistorized this drain, and one second end that this liquid crystal capacitance corresponds to this first end connects one second AC signal.
7. the driving circuit of LCD as claimed in claim 6, wherein this transistor is implemented with a thin film transistor (TFT).
8. the driving circuit of LCD as claimed in claim 7, wherein this storage capacitors with a self-aligned process technique apply finish one the asymmetric electric capacity of polarity is arranged.
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| CNB031573630A CN100373439C (en) | 2003-09-18 | 2003-09-18 | Driving method and circuit for liquid crystal display |
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| CNB031573630A CN100373439C (en) | 2003-09-18 | 2003-09-18 | Driving method and circuit for liquid crystal display |
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| CN100373439C true CN100373439C (en) | 2008-03-05 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100461248C (en) * | 2005-09-29 | 2009-02-11 | 中华映管股份有限公司 | Shared voltage modification circuit and method |
| CN101350172B (en) * | 2007-07-20 | 2012-07-04 | 奇美电子股份有限公司 | Flat display panel, flat display device and control method for pixel polarity inversion |
| TWI436342B (en) * | 2009-04-03 | 2014-05-01 | Innolux Corp | Control method and image display system utilizing the same |
| CN102778796B (en) * | 2012-07-06 | 2015-11-11 | 京东方科技集团股份有限公司 | A kind of thin-film transistor array base-plate and driving method thereof and liquid crystal display |
| CN103869515A (en) * | 2013-12-24 | 2014-06-18 | 中国科学院微电子研究所 | Alternating current driving method of liquid crystal materials |
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| US6239779B1 (en) * | 1998-03-06 | 2001-05-29 | Victor Company Of Japan, Ltd. | Active matrix type liquid crystal display apparatus used for a video display system |
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