CN101452683A - Electric voltage generating system - Google Patents
Electric voltage generating system Download PDFInfo
- Publication number
- CN101452683A CN101452683A CNA2007101971493A CN200710197149A CN101452683A CN 101452683 A CN101452683 A CN 101452683A CN A2007101971493 A CNA2007101971493 A CN A2007101971493A CN 200710197149 A CN200710197149 A CN 200710197149A CN 101452683 A CN101452683 A CN 101452683A
- Authority
- CN
- China
- Prior art keywords
- generating system
- voltage generating
- control module
- electric voltage
- control signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention relates to a voltage generating system applicable to a display drive device. The system dynamically adjusts the frequency of alternate current common voltage through changing a time point of polarity inversion carried out by a signal on a pixel electrode and a signal on a common electrode, so as to achieve the frequency of noise caused by the switch of the disperse alternate current common voltage, and further reduce energy of audio noise and high-frequency noise.
Description
Technical field
The present invention is relevant for a kind of electric voltage generating system, and particularly relevant for a kind of electric voltage generating system that is applicable to LCD.
Background technology
In recent years, flourish along with semiconductor science and technology, to such an extent as to portable electronic product and flat-panel screens product also with rise.And in the middle of the type of numerous flat-panel screens, LCD has become the main flow of each display product immediately based on advantage such as its low voltage operating, radiationless line scattering, in light weight and volume be little.Also also because of so, the display panels during now little chi also often is disposed in the digital camera, watches to the user with this picture that shows that in real time phtographic lens is about to take or recorded.
And well known ground, if when applying the pixel of fixed-bias transistor circuit in display panels for a long time, it can cause the liquid crystal molecule of pixel that the phenomenon of polarization takes place.In order to solve this phenomenon; in display panels; usually signal on the pixel electrode (pixel electrode) and the signal on the common electrode (commonelectrode) can be carried out reversal of poles; just can eliminate the polarization phenomena of liquid crystal molecule effectively with this; in addition, in undersized display panels, in order to cooperate aforesaid operation; the common voltage that is taken place is a common voltage that exchanges, with the voltage difference as pixel electrode and common electrode.
See also Fig. 1 at this, Fig. 1 is the synoptic diagram of known voltage generation systems 100.As shown in Figure 1, the clock generator 121 in the time schedule controller 120 is used to provide a clock signal clk, just exchanges common voltage VCOM according to clock signal clk and exchange common voltage generation circuit 110.
Yet, in known technology, aforesaid clock signal clk is the clock signal of a fixed frequency, in addition, in order to meet the image characteristics showed, this fixed frequency can fall into (approximately about 20Hz-20KHz) in the audiorange just, thus, just can on this fixed frequency, also can have a stronger energy according to the interchange common voltage VCOM that clock signal clk took place, thereby the audible audio-frequency noise of people's ear (that is noise of 20Hz-20KHz) takes place.
In addition, known as industry, charge pump circuit is used for power supply and is used as the supply unit of its related needs voltage source for LCD or drive IC.And charge pump circuit also can suffer from identical problem, please continue to consult Fig. 1 at this, as shown in Figure 1, charge pump circuit 130 is also according to clock signal clk generation predetermined voltage Vg, for instance, charge pump circuit 130 inside generally can have a plurality of switches, and the state of these switches can change according to aforesaid clock signal clk, with the operation that discharges and recharges of decision charge pump circuit 130, and then predetermined voltage Vg takes place; In the same manner, because the state blocked operation of switch also carries out according to clock signal clk, therefore also can face the problem of audio-frequency noise.
Summary of the invention
In view of this, purpose of the present invention is for providing a kind of electric voltage generating system, be applicable to display drive apparatus, the time point that it carries out reversal of poles by signal on the change pixel electrode and the signal on the common electrode, dynamically adjust exchanging the frequency of common voltage, and then reduce the energy of audio-frequency noise.
In addition, another object of the present invention is applicable to display drive apparatus for another kind of electric voltage generating system is provided, and it is by changing the tr pt of the inner switching signal of charge pump circuit, with the frequency of this inside switching signal of dynamic adjustment, and then the energy of reduction audio-frequency noise.
The present invention proposes a kind of electric voltage generating system, is applicable to display drive apparatus, and it comprises the interchange common voltage generation circuit and first control module.Wherein, first control signal is in order to taking place in first control module, and by changing first control signal at least one time point of changing takes place, and dynamically adjusts the frequency of first control signal.Couple first control module and exchange common voltage generation circuit.And, exchange common voltage generation circuit and exchange common voltage according to control signal.
In one embodiment of the invention, when display drive apparatus was in vertical drive interval (verticalactive region), the time point that exchanges common voltage generation transformation was defined energy dissipating (gate-off) interval that can only fall within sweep trace.
In one embodiment of the invention, when display drive apparatus was in vertical blanking interval (verticalblanking region), the time point that exchanges common voltage generation transformation can change arbitrarily.
In one embodiment of the invention, wherein first control signal takes place according to a sequence in first control module.
In one embodiment of the invention, it also includes a sequencer, is coupled to first control module, in order to above-mentioned sequence to take place.
In one embodiment of the invention, wherein above-mentioned sequence is random number sequence row, and sequencer is random number sequence row generator.
In one embodiment of the invention, sequence wherein is made up of a plurality of digital signals.Arbitrary digital signal includes the direction position in a plurality of digital signals, and at least one time position.And first control module postpones according to the direction position or shifts to an earlier date above-mentioned fringe time point, and the amplitude that decides these fringe time points to postpone or do sth. in advance according to the time position in this digital signal.Also can begin the amplitude that decides these fringe time points to postpone according to the time position this digital signal from the foremost entirely as being the time position.
In one embodiment of the invention, wherein when display drive apparatus was in the vertical drive interval, the digital signal of being exported by random number sequence row generator had one first figure place.And when this display drive apparatus was in vertical blanking interval, the digital signal of being exported by random number sequence row generator had a second order digit.Second order digit wherein is greater than first figure place.
In one embodiment of the invention, wherein above-mentioned first control module and sequencer are arranged in the time schedule controller.
In one embodiment of the invention, wherein above-mentioned electric voltage generating system also includes charge pump circuit.This charge pump circuit is coupled to first control module, and charge pump circuit is in order to according to the first above-mentioned control signal generation predetermined voltage.
In one embodiment of the invention, the first wherein above-mentioned control module is used for taking place second control signal in addition.Above-mentioned electric voltage generating system then also includes charge pump circuit.This charge pump circuit is coupled to first control module, and in order to according to the second above-mentioned control signal, predetermined voltage takes place.
In one embodiment of the invention, the first wherein above-mentioned control module changes at least one time point that transformation takes place second control signal, and dynamically adjusts the frequency of second control signal with this.
In one embodiment of the invention, wherein above-mentioned electric voltage generating system also includes second control module and the charge pump circuit that is used for taking place second control signal.Wherein second control module is dynamically adjusted the frequency of this second control signal by changing at least one time point that transformation takes place this second control signal.Charge pump circuit then is coupled to second control module.This charge pump circuit is in order to according to second control signal predetermined voltage to take place.
In one embodiment of the invention, wherein above-mentioned electric voltage generating system, wherein second control signal comprises that the phase place by moving first control signal takes place.
In one embodiment of the invention, wherein above-mentioned electric voltage generating system, wherein first control module and second control module can be switched on separately or turn-off.
In one embodiment of the invention, wherein above-mentioned first control module and second control module are arranged in the time schedule controller.
The present invention proposes another kind of electric voltage generating system, is equally applicable to display drive apparatus, and it comprises control module and charge pump circuit.Control module generation control signal wherein.And charge pump circuit couples control module.Its purpose uses for the pixel of display drive apparatus for predetermined voltage takes place.And this charge pump circuit changes the time point of its inside in order to the transformation of the switching signal of generation predetermined voltage according to control signal, dynamically to adjust the frequency of this switching signal.
Display drive apparatus proposed by the invention and method are because of the time point that carries out reversal of poles by signal on the adjustment pixel electrode and the signal on the common electrode, and dynamically adjust to exchange the frequency of common voltage, and then reach the frequency of disperseing to exchange the noise that is caused when common voltage switches, can suppress the energy of audio-frequency noise and high frequency noise effectively with this.
In view of the above, the digital camera that uses display drive apparatus proposed by the invention and method because the audio-frequency noise that digital camera itself is taken place can be suppressed effectively, does not have noise so can guarantee its tonequality of recording when making video recording.Moreover, using the display drive apparatus proposed by the invention and the LCD of method, the electromagnetic interference (EMI) index of itself also can be suppressed effectively.
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail as follows.
Description of drawings
Fig. 1 is the synoptic diagram of known voltage generation systems 100.
Fig. 2 is the calcspar of the electric voltage generating system 200 of first embodiment of the invention.
What Fig. 3 was represented is the driving sequential chart of a display drive apparatus.
Fig. 4 exchanges the sequential chart of common voltage VCOM in the vertical drive interval for the present invention.
Fig. 5 is for exchanging the sequential chart of common voltage VCOM when vertical blanking interval.
Fig. 6 is the synoptic diagram of an embodiment of one 4/7 linear feedback shift register 600.
Fig. 7 is the calcspar of the electric voltage generating system of second embodiment of the invention.
Fig. 8 is the calcspar of the electric voltage generating system of third embodiment of the invention.
Fig. 9 is the calcspar of the electric voltage generating system of fourth embodiment of the invention.
Figure 10 represents the calcspar of the electric voltage generating system of fifth embodiment of the invention.
The main element symbol description
100,200, A00: electric voltage generating system
120,220,920, A20: time schedule controller
121: clock generator
110,210,810,910, A10: exchange common voltage generation circuit
221,821,823,921,922, A21: control module
222,822,923,924, A22: random number sequence row generator
130,230,830,930, A30: charge pump circuit
600: linear feedback shift register
610-670: register
680: XOR gate
690: multiplexer
722: the fixed sequence program generator
PN1, PN2: sequence
CLK: clock signal
C1, C2: control signal
VSD: vertical synchronizing signal
HSD: horizontal-drive signal
DEN: signal is enabled in data output
T1: frame period
T2: vertical drive interval
T3: vertical blanking interval
Gate: signal
VCOM: exchange common voltage
A1-A3: tr pt
TL: line period
T: apart time between tr pt
N1-N2: adjusted value
Embodiment
One of the technology effect that the present invention desired to reach mainly is audio-frequency noise and the high frequency noise that is caused when signal on the pixel electrode and the signal on the common electrode carry out reversal of poles in order to suppress.And following content will encyclopaedize at the technical characterictic of this case, has and knows that usually the knowledgeable considers and examines to offer field of the present invention.
Fig. 2 is the calcspar of the electric voltage generating system 200 of first embodiment of the invention.Please refer to Fig. 2, electric voltage generating system 200 comprises that one exchanges common voltage generation circuit 210, time schedule controller 220 and a charge pump circuit 230.Wherein, time schedule controller 220 includes control module 221 and random number sequence row generator 222.
In present embodiment, when the LCD (not shown) is activated, exchanges common voltage generation circuit 210 and exchange common voltage VCOM according to the control signal C1 that control module 221 is taken place, use for the pixel on the display panels.Note that at this control signal C1 is not is the clock signal of a fixed frequency, but the signal with different cycles, therefore, the interchange common voltage VCOM that is taken place according to control signal C1 just can reduce the problem of audio-frequency noise.
In present embodiment, control signal C1 takes place according to the random number sequence row that random number sequence row generator 222 is taken place in control module 221.For instance, control module 221 to be dynamically changing the tr pt of control signal C1, and then dynamically adjusts the frequency of control signal C1.Thus, the interchange common voltage VCOM that is taken place according to control signal C1 also can change the time point (this is equivalent to the frequency that dynamic adjustment exchanges common voltage VCOM) of its transformation accordingly; And in present embodiment, charge pump circuit 230 also according to control signal C1 take place display interior must predetermined voltage Vg.
Please note at this, because it is roughly the same in order to the occurring mode of the inside switched voltage of generation predetermined voltage Vg to exchange common voltage VCOM and charge pump circuit 230, therefore in thereafter open, will exchange that the method for generation of common voltage VCOM and its sequential set forth at the present invention.
What deserves to be mentioned is earlier that in this in the driving sequential of display drive apparatus, complete frame (frame) cycle includes vertical drive interval and vertical blanking interval.Please be simultaneously with reference to Fig. 3, what Fig. 3 was represented is the driving sequential chart of a display drive apparatus.Shown in the 3rd figure, frame period T1 starts from vertical synchronizing signal VSD and is converted to 0 by 1, and end at vertical synchronizing signal next time be converted to 0 by 1.In a frame period T1, comprised the operation of a lot of line scannings (line scan), and parallel synchronizing signal HSD to be converted to 0 by 1 each time promptly be the generation of representing each line scanning operation.It then is that expression has data can be sent to display panel that signal DEN is enabled in data output, and just being illustrated in data output, to enable signal DEN be 1 o'clock, and the pixel of display panel can be driven.
Please contrast the signal sequence on Fig. 3, when vertical synchronizing signal VSD was converted to 0 by 1, the frame period, T1 began.And the line scanning operation begins to carry out synchronously.Also therefore parallel synchronizing signal HSD begins the transformation that goes round and begins again by 1 to 0,0 to 1.From the narration of the preceding paragraph, can understand, parallel synchronizing signal HSD each time by 1 be converted to a row of 0 expression scan operation.And in the front that frame period T1 has just started during several line scanning start, data output is enabled signal DEN and was not activated, and remains on 0 always.And when the last several line scanning start of frame period T1, data output is enabled signal DEN and was not activated too and remains on 0.The zone that signal DEN is not activated is enabled in this two segment datas output, is called vertical blanking interval (vertical blanking region) T3 at this.Relative, signal DEN is enabled in data output the zone that is activated, and then is called vertical drive interval (verticalactive region) T2.
Note that in a preferred embodiment of the present invention that at this control signal C1 has different restrictions in vertical blanking interval with the vertical drive interval, so the amplitude that its frequency is adjusted is different.
Please continue with reference to Fig. 2 and Fig. 3.Note that when electric voltage generating system 200 is in vertical drive interval T2 that at this time point that exchanges common voltage VCOM (control signal C1) generation transformation must fall within the energy dissipating interval of sweep trace; Aforesaid sweep trace energy dissipating interval is gate turn-off interval (gate-offregion).This restriction is to lead because of can putting bright pixel in display during at the interval T2 of vertical drive, if (gate-on region) changes and exchange common voltage VCOM in the gate turn-on interval, can make picture that the phenomenon of flicker takes place.Therefore, in a preferred embodiment of the present invention, exchange common voltage VCOM and change,, so just can avoid the phenomenon that picture is influenced or glimmer because this moment, grid was an off state in the gate turn-off interval.
On the other hand, when electric voltage generating system 200 was in vertical blanking interval T3, because this moment, panel pixel was not driven, the time point that exchanges common voltage VCOM generation transformation can't be subjected to above-mentioned restriction, so its time point can fall within any interval.
See also Fig. 4, Fig. 4 exchanges common voltage VCOM (control signal C1) in the sequential chart in vertical drive interval for the present invention.In Fig. 4, signal Gate represents that grid is switched on when 1 level, promptly is so-called gate turn-on interval.Signal Gate then is that the expression grid is turned off when 0 level, promptly is so-called gate turn-off interval.As previously described, the influenced or flicker for fear of picture, tr pt A1, the tr pt A2 and the tr pt A3 that exchange common voltage VCOM (control signal C1) all are controlled in the gate turn-off interval; But, please note at this, the time point that changes each time that exchanges common voltage VCOM is neither together, the former fixed cycle that exchanges common voltage VCOM (control signal C1) in this hypothesis is TL, control module 221 can be listed as according to the random number sequence that random number sequence row generator 222 is taken place so, the amplitude that the cycle (or tr pt position) is changed when deciding each the transformation, for example when changing for the first time (tr pt A1), the cycle (or tr pt position) is just changed into TL-N1 by TL originally.
In other words, the frequency that exchanges common voltage VCOM is dynamically adjusted in meeting of the present invention, and thus, the energy that exchanges common voltage VCOM transformation just can not concentrate on a specific frequency, has therefore just improved the problem that audio-frequency noise takes place common voltage VCOM that exchanges.
See also Fig. 5, Fig. 5 is for exchanging the sequential chart of common voltage VCOM (control signal C1) when vertical blanking interval.In Fig. 5, display is in vertical blanking interval, and as previously mentioned, because this moment, panel pixel was not driven, therefore, the tr pt that exchanges common voltage VCOM can drop on any interval, and is not limited only to aforesaid gate turn-off interval.As shown in Figure 5, the frequency that exchanges common voltage VCOM equally continues dynamically adjusting, and because the adjustable extent in the cycle (tr pt position) of the interchange common voltage VCOM of this moment more strengthens, make the transformation energy that exchanges common voltage VCOM can be dispersed to wider frequency band, so the effect that just can make noise reduce is more remarkable.
Actually, aforesaid mechanism has for this field knows that usually the knowledgeable should not embarrass, and please continue with reference to Fig. 2 at this, and as previously mentioned, random number sequence row generator 222 is used for taking place random number sequence row.In present embodiment, the number that this random number sequence is classified a multidigit that continuously changes as constitutes, and this number that continues the multidigit of change can be formulated for the combination of direction position with the time position of numeral.Wherein the direction position is in order to control lag or exchange the time point that common voltage VCOM changes in advance.The time position then is with deciding time point delay that exchanges common voltage VCOM transformation or the amplitude of doing sth. in advance.In addition, these random number sequence row also can be treated as the combination of the time position that is numeral entirely, with the amplitude of the time point delay that decides interchange common voltage VCOM to change.
Please refer to Fig. 4 this moment.In the expression of Fig. 4, each time T that exchanges between the tr pt of common voltage VCOM is apart all changing always.Wherein represented tr pt A1 of Fig. 4 and tr pt A2 the time apart deduct adjusted value N1 for line period TL.The time phase reducing here, the time point that is exactly expression interchange common voltage VCOM transformation is just controlled by the direction position by ahead of time.And adjusted value N1 shifts to an earlier date amplitude by the time that the time position is decided.Give one example again, tr pt A2 and tr pt A3 the time apart add adjusted value N2 for line period TL, wherein the operation of time addition represents that the time point that exchanges common voltage VCOM transformation is delayed, and adjusted value N2 delays amplitude by the time that the time position is decided.
Please note at this, in general, desirable random number sequence row have unpredictability, and the number of times that each random numerical value occurs should be identical, therefore, adopt random number sequence row to make to exchange the time point that common voltage VCOM changes can be, and then make and exchange that common voltage VCOM changes and the noise that takes place is distributed on the different frequency effectively, thereby make noise reduce function to reach the best by the change on evenness ground.For instance, if aforesaid number series has the different random numerical value of k kind, so in theory, exchange that common voltage VCOM changes and the noise that takes place will be dispersed to the different frequency of k kind, thereby reduced audio-frequency noise.
Therefore, in present embodiment, the present invention adopts a linear feedback shift register, and (linearfeedback shift register is LFSR) as random number generator 222 usefulness.See also Fig. 6 at this, Fig. 6 is the synoptic diagram of an embodiment of one 4/7 linear feedback shift register 600.As shown in Figure 6, linear feedback shift register 600 is finished by seven shift register 610-670, an XOR gate (XORgate) 680 and a multiplexer 690; At this, because the function of linear feedback shift register 600 has been that industry is known with running, so its detail operations is not just given unnecessary details in this.Yet, this note that multiplexer 690 usefulness decide feed back to XOR gate 680 signal why.For instance, if only beard and hair is given birth to 4 random number sequence row, so much multiplexer 690 just can select signal that shift register 640 exported as feedback signal; On the other hand, if beard and hair is given birth to 7 random number sequence row, so much multiplexer 690 just can select signal that shift register 670 exported as feedback signal.
Such structure is in order to cooperate aforesaid mechanism, as previously mentioned, when vertical drive is interval, preferably fall within grid energy dissipating zone (gate-off region) owing to exchange the tr pt of common voltage VCOM, the figure place of the random number sequence row that therefore taken place must be less, so that it is less to exchange the time point skew of common voltage VCOM (control signal C1) transformation, therefore, in present embodiment, when display is in the vertical drive interval, multiplexer 690 just can select signal that shift register 640 exported as feedback signal, to export 4 random number sequence row.On the other hand, when in vertical blanking interval, can fall within the optional position owing to exchange the tr pt of common voltage VCOM, therefore just can adopt the bigger random number sequence row of figure place, therefore, in present embodiment, when display is in vertical blanking interval, multiplexer 690 just can select signal that shift register 670 exported as feedback signal, to export 7 random number sequence row.
Note that at this aforesaid linear feedback shift register 600 only is an embodiment of random number generator, but not its restriction.In realization, the dealer can adopt the random number generator of other kinds.In addition, the quantity of shift register is also unrestricted in the linear feedback shift register 600, and the dealer can adopt more or less shift register, and so corresponding variation also belongs to category of the present invention.
In addition, though in foregoing disclose, adopt a random number sequence to be listed as generation foundation as control signal, yet, the also non-restriction of the present invention of such structure, adopt the reason of random number sequence row to be that random number sequence row can reach certain random degree, can be so that energy be distributed on the different frequency more fifty-fifty.Yet in practical application, the dealer also can adopt a fixed sequence program (such as sequence of one-period property), dynamically adjusts the frequency that exchanges common voltage, and so corresponding variation also belongs to category of the present invention.
See also Fig. 7 at this, Fig. 7 is the calcspar of the electric voltage generating system of second embodiment of the invention.In present embodiment, the present invention adopts a fixed sequence program generator 722 to replace the random number sequence row generator 222 of Fig. 2, because its principle states in foregoing disclosure that this field has knows that usually the knowledgeable should understand and be realized, so do not give unnecessary details in this in addition.
See also Fig. 8 at this, Fig. 8 is the calcspar of the electric voltage generating system of third embodiment of the invention.In present embodiment, random number sequence row generator 822 is exported different random number sequence row PN1, PN2 respectively to control module 821,823, therefore, different control signal C1, C2 can take place according to random number sequence row PN1, PN2 respectively in control module 821,823, and therefore interchange common voltage generation circuit 810 thereafter and charge pump circuit 830 are taken place exchanges common voltage VCOM and charge pump circuit 830 is also different in order to the sequential of the inside switched voltage of generation predetermined voltage Vg.
Aforesaid design is in order to disperse to exchange common voltage VCOM and the charge pump circuit 830 fringe time point in order to inside switched voltage that predetermined voltage Vg takes place, make the energy when exchanging common voltage VCOM changes with the inside switched voltage of charge pump circuit 830 can not fall within identical frequency in the same time, the benefit of energy dispersive is so just more arranged, and then reduce audio-frequency noise.
In addition, when when charge pump circuit 830 is turned off (when for example Suo Shu display drive apparatus uses plug-in power supply), control module 823 can be turned off separately.And relative, when exchanging common voltage generation circuit 810 and be turned off (for example display panel is not lighted, and in the display drive apparatus other element also when work), control module 821 can also be turned off separately, to save power consumption.
And aforesaid design has for this field and knows the not so difficult realization of the knowledgeable usually, linear feedback shift register 600 with Fig. 6 is an example, in general, each is combined by four outputs of shift register 610,620,630,640 respectively in one 4 the random logarithmic data; In other words, only four of shift register 610,620,630,640 must be exported permutation and combination in addition, just can draw several 4 different random logarithmic datas; Therefore, utilize aforesaid principle, the dealer can be coupled to control module 821,823 respectively the different node of linear feedback shift register 600, receiving different random number sequence row PN1, PN2, and then disperse to exchange the fringe time point of the inside switched voltage of common voltage VCOM and charge pump circuit 830.
See also Fig. 9 at this, Fig. 9 is the calcspar of the electric voltage generating system of fourth embodiment of the invention.In present embodiment, adopt two random number sequence row generators 923,924, to export different random number sequence row PN1, PN2 respectively to control module 921,922.Therefore, different control signal C1, C2 just can take place according to random number sequence row PN1, PN2 respectively in control module 921,922, therefore interchange common voltage generation circuit 910 thereafter and charge pump circuit 930 are taken place exchanges common voltage VCOM, also different with the sequential of the inside switched voltage of charge pump circuit 930, and then the fringe time point of the inside switched voltage of dispersion interchange common voltage VCOM and charge pump circuit 930, to reach the purpose that reduces audio-frequency noise.
Below see also Figure 10 again, Figure 10 represents the calcspar of the electric voltage generating system of fifth embodiment of the invention.Wherein, electric voltage generating system A00 comprises that one exchanges common voltage generation circuit A10, time schedule controller A20 and a charge pump circuit A30.Time schedule controller A20 includes control module A21 and random number sequence row generator A22, wherein exchange common voltage generation circuit A10 and take place to exchange common voltage VCOM, and predeterminated voltage Vg takes place charge pump circuit A30.
Note that in the 5th embodiment that at this two groups of different control signal C1 and control signal C2 take place respectively control module A21.Exchange common voltage generation circuit A10 and charge pump circuit A30 and then receive control signal C1 and control signal C2 respectively, use for exchanging common voltage generation circuit A10 and charge pump circuit A30.So the practice electric voltage generating system 200 more mentioned than first embodiment has more effect.Yet, such mechanism has for this field knows the not so difficult realization of the knowledgeable usually, for instance, control signal C1 can take place according to random number sequence row earlier in control module A21, then control signal C2 takes place in the phase place by mobile control signal C1, aforesaid mechanism also belongs to category of the present invention.
Compared to known technology, electric voltage generating system of the present invention can effectively reduce the noise that audio-frequency noise brings, and therefore, the electronic installation (as digital camera, PDA etc.) of using voltage generation circuit of the present invention more can not be subjected to the interference of noise when making video recording.
Though the present invention with preferred embodiment openly as above, so it is not in order to limit the present invention.Those of ordinary skill under any in the technical field under the situation that does not break away from the spirit and scope of the present invention, can carry out various changes and modification.Therefore, protection scope of the present invention is as the criterion with the scope of the claim that proposed.
Claims (28)
1. an electric voltage generating system is applicable to display drive apparatus, and this electric voltage generating system comprises:
One first control module in order to one first control signal to take place, and changes this first control signal at least one time point of changing takes place, dynamically to adjust the frequency of this first control signal; And
One exchanges common voltage generation circuit, couples this first control module, in order to according to this control signal, takes place one and exchanges common voltage.
2. electric voltage generating system as claimed in claim 1, wherein when this display drive apparatus was in vertical drive interval, this time point that this first control signal takes place to change changed in the energy dissipating interval of sweep trace.
3. electric voltage generating system as claimed in claim 1, wherein when display drive apparatus was in a vertical blanking interval, this time point of this first control signal can change arbitrarily.
4. electric voltage generating system as claimed in claim 1, wherein this first control signal takes place according to a sequence in this first control module.
5. electric voltage generating system as claimed in claim 4, it also includes:
One sequencer couples this first control module, in order to this sequence to take place.
6. electric voltage generating system as claimed in claim 5, wherein this sequence is random number sequence row, and this sequencer is a random number sequence row generator.
7. electric voltage generating system as claimed in claim 6, wherein this sequence is made up of a plurality of digital signals, arbitrary digital signal includes a direction position in these a plurality of digital signals, and at least one time position, this first control module postpones according to this direction position or this time point in advance, and the amplitude that decides this time point to postpone or do sth. in advance according to the time position in this digital signal.
8. electric voltage generating system as claimed in claim 7, wherein when this display drive apparatus is in this vertical drive interval, digital signal by this unrest number sequence row generator output has one first figure place, and when this display drive apparatus is in this vertical blanking interval, digital signal by this unrest number sequence row generator output has a second order digit, and this second order digit is greater than this first figure place.
9. electric voltage generating system as claimed in claim 5, wherein this first control module and this sequencer are arranged in the time schedule controller.
10. electric voltage generating system as claimed in claim 1, it also includes:
One charge pump circuit couples this first control module, in order to according to this first control signal, a predetermined voltage takes place.
11. electric voltage generating system as claimed in claim 1, wherein this first control module is used for taking place one second control signal in addition, and this electric voltage generating system also includes:
One charge pump circuit couples this first control module, in order to according to this second control signal, a predetermined voltage takes place.
12. electric voltage generating system as claimed in claim 11, wherein this first control module changes at least one time point that transformation takes place this second control signal, dynamically to adjust the frequency of this second control signal.
13. electric voltage generating system as claimed in claim 11, wherein this second control signal takes place by the phase place that moves this first control signal in this first control module.
14. electric voltage generating system as claimed in claim 1, it also includes:
One second control module is used for taking place one second control signal, and changes at least one time point that transformation takes place this second control signal, dynamically to adjust the frequency of this second control signal; And
One charge pump circuit couples this second control module, in order to according to this second control signal, a predetermined voltage takes place.
15. electric voltage generating system as claimed in claim 14, wherein this first control module and this second control module can be switched on separately or turn-off.
16. electric voltage generating system as claimed in claim 14, wherein this first control module and this second control module are arranged in the time schedule controller.
17. electric voltage generating system as claimed in claim 14, wherein this first control signal takes place according to one first sequence in this first control module, and this second control module according to one second sequence this second control signal takes place.
18. electric voltage generating system as claimed in claim 17, it also includes:
One sequencer couples this first control module and this second control module, in order to this first sequence and this second sequence to take place.
19. electric voltage generating system as claimed in claim 18, wherein this first sequence and this second sequence are all random number sequence row, and this sequencer is a random number sequence row generator.
20. electric voltage generating system as claimed in claim 17, it also includes:
One first sequencer couples this first control module, in order to this first sequence to take place; And
One second sequencer couples this second control module, in order to this this second sequence to take place.
21. electric voltage generating system as claimed in claim 20, wherein this first sequence and this second sequence are all random number sequence row, and this first sequencer and this second sequencer are all a random number sequence row generator.
22. an electric voltage generating system is applicable to display drive apparatus, this electric voltage generating system comprises:
One control module in order to a control signal to take place, and is dynamically adjusted this control signal the time point that changes is taken place, to change the frequency of this control signal; And
One charge pump circuit couples this control module, in order to according to this control signal, a predetermined voltage takes place.
23. electric voltage generating system as claimed in claim 22, wherein this control signal takes place according to a sequence in this control module.
24. electric voltage generating system as claimed in claim 23, it also includes:
One sequencer couples this control module, in order to this sequence to take place.
25. electric voltage generating system as claimed in claim 24, wherein this sequence is random number sequence row, and this sequencer is a random number sequence row generator.
26. electric voltage generating system as claimed in claim 25, wherein this sequence is made up of a plurality of digital signals, arbitrary digital signal includes a direction position in these a plurality of digital signals, and at least one time position, this control module postpones according to this direction position or this time point in advance, and the amplitude that decides this time point to postpone or do sth. in advance according to the time position in this digital signal.
27. electric voltage generating system as claimed in claim 26, wherein when this display drive apparatus is in vertical drive interval, digital signal by this unrest number sequence row generator output has one first figure place, and when this display drive apparatus is in a vertical blanking interval, digital signal by this unrest number sequence row generator output has a second order digit, and this second order digit is greater than this first figure place.
28. electric voltage generating system as claimed in claim 22, wherein this control module and this sequencer are arranged in the time schedule controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101971493A CN101452683B (en) | 2007-12-05 | 2007-12-05 | Electric voltage generating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101971493A CN101452683B (en) | 2007-12-05 | 2007-12-05 | Electric voltage generating system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101452683A true CN101452683A (en) | 2009-06-10 |
| CN101452683B CN101452683B (en) | 2010-10-13 |
Family
ID=40734888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101971493A Expired - Fee Related CN101452683B (en) | 2007-12-05 | 2007-12-05 | Electric voltage generating system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101452683B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475213A (en) * | 2013-08-16 | 2013-12-25 | 矽创电子股份有限公司 | Power supply circuit with multi-stage charge pump |
| CN103869859A (en) * | 2012-12-12 | 2014-06-18 | 硕颉科技股份有限公司 | Shared voltage generating circuit |
| CN108694922A (en) * | 2018-04-03 | 2018-10-23 | 昆山龙腾光电有限公司 | Common voltage driving method, device and display device |
| CN111210775A (en) * | 2018-11-21 | 2020-05-29 | 乐金显示有限公司 | Display device and driving method thereof |
| CN111383609A (en) * | 2018-12-29 | 2020-07-07 | 咸阳彩虹光电科技有限公司 | Time sequence control method, time sequence controller and display device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6067363A (en) * | 1996-06-03 | 2000-05-23 | Ericsson Inc. | Audio A/D convertor using frequency modulation |
| JP2003235244A (en) * | 2002-02-06 | 2003-08-22 | Seiko Instruments Inc | Rash current limiting/noise reducing circuit for pfm control charge pump |
| US7151413B2 (en) * | 2004-12-02 | 2006-12-19 | Via Technologies Inc. | Low noise charge pump for PLL-based frequence synthesis |
-
2007
- 2007-12-05 CN CN2007101971493A patent/CN101452683B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103869859A (en) * | 2012-12-12 | 2014-06-18 | 硕颉科技股份有限公司 | Shared voltage generating circuit |
| CN103475213A (en) * | 2013-08-16 | 2013-12-25 | 矽创电子股份有限公司 | Power supply circuit with multi-stage charge pump |
| CN103475213B (en) * | 2013-08-16 | 2017-03-01 | 矽创电子股份有限公司 | Power supply circuit with multi-stage charge pump |
| CN108694922A (en) * | 2018-04-03 | 2018-10-23 | 昆山龙腾光电有限公司 | Common voltage driving method, device and display device |
| CN108694922B (en) * | 2018-04-03 | 2020-11-03 | 昆山龙腾光电股份有限公司 | Common voltage driving method and device and display device |
| CN111210775A (en) * | 2018-11-21 | 2020-05-29 | 乐金显示有限公司 | Display device and driving method thereof |
| CN111383609A (en) * | 2018-12-29 | 2020-07-07 | 咸阳彩虹光电科技有限公司 | Time sequence control method, time sequence controller and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101452683B (en) | 2010-10-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10380965B2 (en) | Power circuit of displaying device | |
| CN101231836B (en) | Display control drive device and display system | |
| CN106951123B (en) | Touch-control driving unit and its driving method, touch drive circuit, display device | |
| CN101452683B (en) | Electric voltage generating system | |
| CN101996684B (en) | Shift register and touch controller | |
| US20090135171A1 (en) | Voltage generating system | |
| CN104750339A (en) | Display device with integrated touch screen and driving method thereof | |
| CN104464600A (en) | Shifting register unit, driving method of shifting register unit, shifting register circuit and display device | |
| CN101246676A (en) | Liquid crystal display | |
| CN103474095B (en) | Shift register circuit and operation method thereof | |
| CN1346123A (en) | Driver for indicator | |
| CN102201192B (en) | Level shift circuit, data driver and display device | |
| KR20140097891A (en) | Display device | |
| JP2014170170A (en) | Driver ic | |
| CN100514404C (en) | Electric charge sharing apparatus for display panel | |
| CN100356417C (en) | Data drive and electronic optical device | |
| CN100419820C (en) | Display driver, electro-optical device, and control method for display driver | |
| CN108877731A (en) | Driving method, the display panel of display panel | |
| CN103412672A (en) | Touch display device and driving method thereof | |
| CN106847159B (en) | A kind of shift register, gate driving circuit and display panel | |
| CN105206234A (en) | Shift register unit, grid drive method, circuit and grid drive device | |
| CN116386558A (en) | Driving method and driving circuit of display device and display device | |
| CN113570996B (en) | Driving circuit of display panel and display device | |
| CN104966497A (en) | Scanning driving circuit and touch liquid crystal display device | |
| CN203338322U (en) | Touch display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101013 Termination date: 20121205 |