CN102956187A - Method for controlling drive waveform in maintenance period of plasma display screen - Google Patents
Method for controlling drive waveform in maintenance period of plasma display screen Download PDFInfo
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- CN102956187A CN102956187A CN201210520971XA CN201210520971A CN102956187A CN 102956187 A CN102956187 A CN 102956187A CN 201210520971X A CN201210520971X A CN 201210520971XA CN 201210520971 A CN201210520971 A CN 201210520971A CN 102956187 A CN102956187 A CN 102956187A
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Abstract
The embodiment of the invention discloses a method for controlling a drive waveform in a maintenance period of a plasma display screen. The method is characterized by comprising the following steps of determining a position of an intersection point of a descending edge of a first electrode maintenance pulse of the display screen and a rising edge of a second electrode maintenance pulse; when and only when a control time sequence is arranged at a descending edge stage of the second electrode maintenance pulse, keeping low level energy to recover an ERL control at an opening state; and when and only when the control time sequence is arranged at the intersection point, starting high level energy recovery ERH-2 control of a second electrode. The method for controlling the drive waveform in the maintenance period of the plasma display screen, disclosed by the invention, not only eliminates an incidental image problem of the display screen, but also eliminates athe probability that a self-discharge site of the displace screen is arranged between two pulses, improvesso a display effect of the displace screen is improved, and solves problems of the existing method for controlling the drive waveform in the maintenance period of the display screen are solved.
Description
Technical field
The present invention relates to the plasma panel field, relate in particular to a kind of plasma panel maintenance phase drive waveforms control method.
Background technology
Plasma panel video picture principle is extremely to apply a kind of drive waveforms at the X of the display screen utmost point and Y, makes gas discharge discharge and impact fluorescent powder as pixel cell, forms image.This drive waveforms generally comprises three parts: convalescence, address period and maintenance phase.Convalescent effect is to remove residual wall electric charge after the discharge, and the effect of address period is to finish address discharge, and the pixel that needs are lighted chooses, and the effect of maintenance phase is to keep the display screen discharge, namely lights the pixel that address period selects and keeps.
Be applied to the X utmost point of display screen and the maintenance phase drive waveforms of the Y utmost point and be approximately square wave, Fig. 1 shows theoretical waveform and the control sequential (cycle is T ') of this driving ripple.Its control method makes drive waveforms rise to maximum level by minimum level for recover (X_ERH and Y_ERH) control by the high level energy, the drive waveforms of two electrodes drops to minimum level by maximum level when recovering (X/Y_ERL) control by the low level energy, and controls and keep pulses low (X_SUSL and Y_SUSL) control and make the drive waveforms of this electrode maintain respectively maximum level and minimum level by the pulse high level (X_SUSH and Y_SUSH) of keeping of each electrode.Under this control method, if display screen can cause serious image retention problem out of order, reduce the display effect of screen; And keeping the pulse negative edge stage of an electrode, another electrode keep waveform very likely for minimum level, thereby cause display screen self discharge low discharge (selfdischarge low discharge is called for short SELD), can affect equally the display effect of screen.
Summary of the invention
In view of this, the object of the invention is to provide a kind of plasma panel maintenance phase drive waveforms control method, to solve prior art when eliminating image retention, can't guarantee the problem of the display effect of plasma panel.
For achieving the above object, the invention provides following technical scheme:
A kind of plasma panel maintenance phase drive waveforms control method comprises:
Determine that the first electrode of described display screen keeps the negative edge of pulse and the position of intersecting point that the second electrode is kept the rising edge of pulse;
Control sequential that and if only if is kept pulse at described the second electrode and is in negative edge during the stage, keeps the low level energy to recover ERL control and is in opening;
When control sequential that and if only if arrives described intersection point place, open the second electrode high level energy and recover ERH_2 control.
Preferably, described method also comprises: when the control sequential reached described the second electrode and keeps the peak of rising edge of a pulse, the pulses low SUSL_1 that keeps that keeps pulse high level SUSH_2 control and the first electrode that opens the second electrode controlled.
Preferably, described method also comprises: when the control sequential arrived described the first electrode and keeps the negative edge starting point of pulse, that closes the first electrode kept pulse high level SUSH_1 control.
Preferably, described method also comprises: whether the display effect of judging described display screen meets the demands, and if not, then redefines the position of described intersection point; Wherein,
The described position that redefines described intersection point comprises the time interval that changes described SUSH_1 control close moment and described ERH_2 control start-up time.
Can find out from above-mentioned technical scheme, the present invention is by making the first electrode keep the negative edge of pulse and rising edge that the second electrode is kept pulse intersects, the situation of " electrode keep pulse is in negative edge, another electrode is kept waveform and is in minimum level " so that can not occur between these two pulses, thereby eliminated the possibility that the local point of display screen self discharge between these two pulses, occurs, improved the display effect of display screen.Simultaneously under constant prerequisite of the cycle that two electrodes are kept waveform, two pulses are intersected, being equivalent to that the second electrode is kept waveform moves to left at the time transverse axis, shortened the time interval of twice discharge, improved the brightness of display screen, and ERH_2 control is not opened when the second electrode rising edge has just begun, to a certain degree in (two electrodes are kept the intersection point place of waveform) time, just open but rise to thereon, namely shortened the action time of ERH_2, can improve equally the brightness of display screen, so that the display screen image retention problem is solved.As seen, the above embodiment of the present invention has been eliminated the display screen image retention problem, has improved its display effect, has solved the problem that existing display screen maintenance phase drive waveforms control method exists.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 drives the theoretical waveforms of ripple and the sequential chart of control signal for existing plasma panel maintenance phase;
The process flow diagram of the plasma panel maintenance phase drive waveforms control method that Fig. 2 provides for the embodiment of the invention;
Fig. 3 drives the theoretical waveforms of ripple and the sequential chart of control signal for the plasma panel maintenance phase that the embodiment of the invention provides;
The structure diagram of the plasma panel maintenance phase drive waveforms control circuit that Fig. 4 provides for the embodiment of the invention;
Fig. 5 drives the theoretical waveforms of ripple and the sequential chart of control signal for the plasma panel maintenance phase that the embodiment of the invention provides;
The process flow diagram of the plasma panel maintenance phase drive waveforms control method that Fig. 6 provides for the embodiment of the invention;
The control effect contrast figure of the control method that Fig. 7 provides for existing control method and the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The embodiment of the invention discloses a kind of plasma panel maintenance phase drive waveforms control method, to solve prior art when eliminating image retention, can't guarantee the problem of the display effect of plasma panel.
With reference to Fig. 2, the plasma panel maintenance phase drive waveforms control method that the embodiment of the invention provides comprises step:
201: the first electrode of determining display screen is kept the negative edge of pulse and the position of intersecting point that the second electrode is kept the rising edge of pulse;
According to the display effect of current display screen, the staff designs theoretical waveforms that the first electrode and the second electrode maintenance phase drive ripple as the control target, mainly comprises: selected the first electrode is kept 1 S on the negative edge of pulse
0(t, V) keeps the intersection point of rising edge of a pulse as itself and the second electrode, and namely controlling effect is that at t constantly, the rising edge voltage that the second electrode is kept pulse reaches V.As shown in Figure 3, selected S (t4, V) is intersection point.Need to prove that the t1 ~ t6 among Fig. 3 is the relative timing in one-period T.
202: the negative edge that control sequential that and if only if is kept pulse at the second electrode kept the low level energy to recover ERL control and is in opening during the stage;
As shown in Figure 3,, should make the second electrode maintenance phase drive ripple and drop to minimum level by maximum level in the time period at t1 ~ t2, recover ERL control so open the low level energy.And do not open ERL control in the first electrode maintenance phase driving ripple decline stage.
203: when control sequential that and if only if arrives above-mentioned intersection point place, open the second electrode high level energy and recover ERH_2 control.
As shown in Figure 3, at t4 constantly, the first electrode maintenance phase drives ripple and drops to point of intersection S (namely the second electrode maintenance phase drives ripple and rises to point of intersection S), open the second electrode high level energy and reply ERH_2 control, the second electrode maintenance phase driving ripple continuation rising (the first electrode maintenance phase drives ripple continuation decline simultaneously).
In the above-mentioned control method, the negative edge of only keeping pulse at the second electrode when the control sequential was opened the low level energy and is recovered ERL control during the stage, forced the second electrode to keep waveform and dropped to minimum level by maximum level; And keep the pulse negative edge stage at the first electrode, do not open ERL control, so that the electric charge on the first electrode moves to the second electrode, when namely the first electrode is kept pulse and is begun to descend, the second electrode is kept pulse and is begun to rise, when the quantity of electric charge of two electrodes equated, the waveform of keeping of two electrodes intersected; Open again the second electrode high level energy and recover ERH_2 control, make the electric charge that forces the first electrode continue to move to the second electrode, thereby the first electrode is kept pulse and is dropped to minimum level, and the second electrode is kept pulse and risen to maximum level simultaneously, finishes the intersection that two electrodes are kept waveform.
Can be found out by said method, embodiment of the invention control method makes the first electrode keep the negative edge of pulse and rising edge that the second electrode is kept pulse intersects, the situation of " electrode keep pulse is in negative edge, another electrode is kept waveform and is in minimum level " so that can not occur between these two pulses, thereby eliminated the possibility that the local point of display screen self discharge between these two pulses, occurs, improved the display effect of display screen.Simultaneously under constant prerequisite of the cycle that two electrodes are kept waveform, two pulses are intersected, being equivalent to that the second electrode is kept waveform moves to left at the time transverse axis, shortened the time interval of twice discharge, improved the brightness of display screen, and ERH_2 control is not opened when the second electrode rising edge has just begun, to a certain degree in (two electrodes are kept the intersection point place of waveform) time, just open but rise to thereon, namely shortened the action time of ERH_2, can improve equally the brightness of display screen, so that the display screen image retention problem is solved.As seen, the above embodiment of the present invention has been eliminated the display screen image retention problem, has improved its display effect, has solved the problem that existing display screen maintenance phase drive waveforms control method exists.
In other embodiments of the invention, the described method of above-described embodiment also comprises step: when the second electrode was kept pulse and risen to peak, the pulses low SUSL_1 that keeps that keeps pulse high level SUSH_2 control and the first electrode that opens the second electrode controlled.When the second electrode is kept pulse and is risen to peak, when namely the first electrode is kept pulse and is dropped to minimum point, also namely the maintenance phase drive waveforms of two electrodes is finished when intersecting, open SUSH_2 control, make the waveform of keeping of the second electrode remain on maximum level, open SUSL_1, make the waveform of keeping of the first electrode remain on minimum level.
Further, the described method of above-mentioned all embodiment includes step: whether the display effect of judging described display screen meets the demands, and if not, then redefines the position of described intersection point.
In addition, except again changing the position of intersection point, also can improve display effect by changing two electrode maintenance phases drivings wave period (being equivalent to change the number of keeping pulse in the maintenance phase).The staff can determine to make the display effect of display screen to reach best point of intersection S and cycle T by repeatedly testing.
In the practical application, arbitrary in extremely of the X utmost point of display screen and Y extremely all can be used as above-mentioned the first electrode, and another utmost point is as the second electrode.The below is described in detail said method with X the first electrode, Y the second electrode very very.
Before implementing control, determine that at first the X utmost point keeps the negative edge of pulse and the position of intersecting point that the Y utmost point is kept the rising edge of pulse: the staff rule of thumb definite waveform cycle (generally, the X utmost point is identical wave period with the driving of Y utmost point maintenance phase), and the selected X utmost point is kept the position of the point of intersection S of the negative edge of pulse and the rising edge that the Y utmost point is kept pulse, obtain the theoretical waveforms that maintenance phase drives ripple, as shown in Figure 5.
After the theoretical waveforms of maintenance phase driving ripple is determined, can utilize circuit shown in Figure 4 to implement the described control method of the embodiment of the invention, wherein Cp is plasma panel, and ER Cap is that energy recovers auxiliary circuit.
Fig. 6 shows how to utilize circuit generation shown in Figure 4 X utmost point maintenance phase driving ripple shown in Figure 5 and Y utmost point maintenance phase driving ripple.Because wave form varies is periodic, so being in the moment that minimum level, the Y utmost point be in maximum level, the selected X utmost point begins to describe as cycle starting point; Take other constantly as the control method of cycle starting point similarly, therefore not to repeat here.
601: keep pulses low X_SUSL control and the Y utmost point at the X utmost point and keep in the situation that pulse high level Y_SUSH control all closes, open the low level energy and recover ERL control, Y utmost point level is descended, i.e. the t1 moment among Fig. 5; This moment, Y utmost point electric charge moved to ER Cap, formed the negative edge that the Y utmost point is kept pulse.
602: when Y utmost point level decline rate is slack-off under the control at ERL, open Y_SUSL control, namely t2 constantly; Under Y_SUSL control, Y utmost point level drops to minimum, i.e. in the t3 moment, this moment, ERL control was inoperative, so it can be closed; Under Y_SUSL control, Y utmost point level maintains minimum.
603: keep in the situation that pulses low X_SUSL closes at the X utmost point, open the high level energy of X and recover X_ERH control, namely t4 rises X utmost point level constantly gradually, forms the rising edge of a pulse of keeping of the X utmost point;
604: under the control at X_ERH, X utmost point electrical level rising to a certain degree the time, the discharge of the X utmost point, level stops to rise, and opens the X utmost point this moment and keeps pulse high level X_SUSH control, namely t5 is constantly; Under X_SUSH control, X utmost point level continues to rise and maintain mxm., and X_ERH this moment effect out of hand can be closed it.
605: close X_SUSH and Y_SUSL control, namely t6 constantly.Because ERL control is not opened and X utmost point level far above the Y utmost point, so X utmost point electric charge is moving to the Y Ghandler motion, carry out simultaneously with Y utmost point electrical level rising so that X utmost point level descends;
606: when the X utmost point and the Y utmost point quantity of electric charge are stable, level equates between the X utmost point and the Y utmost point, reach point of intersection S, electric charge can not continue automated movement; Open the high level energy of Y this moment and recover Y_ERH control, namely t7 forces the continuation of X utmost point electric charge moving to the Y Ghandler motion constantly, and Y utmost point level continues to raise, X utmost point level continues decline.
607: under the control at Y_ERH, Y utmost point electrical level rising to a certain degree, after the Y utmost point discharge, level stops to rise, namely t8 constantly.At this moment, opening the X utmost point keeps pulses low X_SUSL control and the Y utmost point and keeps pulse high level Y_SUSH and control; Y_ERH effect out of hand can be closed it.Under the control of X_SUSL, X utmost point level maintains minimum, comes Temporarily Closed until the X utmost point is kept rising edge of a pulse; Under Y_SUSH control, Y utmost point level continues to rise and maintain mxm., comes Temporarily Closed until the Y utmost point is kept the pulse negative edge, returns step 601.
Adopt said method that display screen is carried out cycle control, and observe the display effect of display screen, if can not meet the demands, then change the position of point of intersection S, re-start cycle control, until display effect meets the demands.The position of point of intersection S mainly can change by following dual mode:
(1) change X_SUSH and close (being t6) to the time interval T ' between the Y_ERH unlatching (being t7)=t7-t6, T ' is less, and the level of point of intersection S is higher;
(2) change the energy storage capacity of energy recovery circuit ER Cap, as change its inductance value, thereby change X utmost point level decline rate (or Y utmost point electrical level rising speed), reach the purpose that changes the point of intersection S position.
Fig. 7 will contrast by existing the control method drive waveforms (actual waveform one) that obtains and the drive waveforms (actual waveform two) that obtains by the described control method of the embodiment of the invention.As seen, in identical situation of cycle, adopt the described control method of the embodiment of the invention, can shorten that the X utmost point is kept rising edge of a pulse and the upper Y utmost point that is adjacent is kept time interval between the rising edge of a pulse, namely shortened the time interval of twice discharge, thereby improved the brightness of display screen, eliminated afterimage phenomena.Simultaneously, when keeping pulse and be in negative edge with respect to the X utmost point in the existing control method, the Y utmost point is in minimum level, when the described method of the embodiment of the invention makes the X utmost point keep pulse to be in negative edge, the Y utmost point is kept pulse and is in rising edge, thereby makes the possibility that the SELD phenomenon occurs reduce half.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can in the situation that does not break away from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (4)
1. a plasma panel maintenance phase drive waveforms control method is characterized in that, comprising:
Determine that the first electrode of described display screen keeps the negative edge of pulse and the position of intersecting point that the second electrode is kept the rising edge of pulse;
Control sequential that and if only if is kept pulse at described the second electrode and is in negative edge during the stage, keeps the low level energy to recover ERL control and is in opening;
When control sequential that and if only if arrives described intersection point place, open the second electrode high level energy and recover ERH_2 control.
2. method according to claim 1, it is characterized in that, also comprise: when the control sequential reached described the second electrode and keeps the peak of rising edge of a pulse, the pulses low SUSL_1 that keeps that keeps pulse high level SUSH_2 control and the first electrode that opens the second electrode controlled.
3. method according to claim 1 and 2 is characterized in that, also comprises: when the control sequential arrived described the first electrode and keeps the negative edge starting point of pulse, that closes the first electrode kept pulse high level SUSH_1 control.
4. method according to claim 3 is characterized in that, also comprises: whether the display effect of judging described display screen meets the demands, and if not, then redefines the position of described intersection point; Wherein,
The described position that redefines described intersection point comprises the time interval that changes described SUSH_1 control close moment and described ERH_2 control start-up time.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1319221A (en) * | 1998-09-23 | 2001-10-24 | 松下电器产业株式会社 | Positive column AC plasma display |
| CN1551070A (en) * | 2003-05-16 | 2004-12-01 | 富士通日立等离子显示器股份有限公司 | Plasma display device |
| CN1573856A (en) * | 2003-06-18 | 2005-02-02 | 株式会社日立制作所 | Plasma display device |
| JP2005157338A (en) * | 2003-11-04 | 2005-06-16 | Matsushita Electric Ind Co Ltd | Method of driving plasma display panel and plasma display device |
| US20070205964A1 (en) * | 2004-04-12 | 2007-09-06 | Matsushita Electric Industrial Co., Ltd. | Plasma display panel display device |
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- 2012-12-06 CN CN201210520971XA patent/CN102956187A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1319221A (en) * | 1998-09-23 | 2001-10-24 | 松下电器产业株式会社 | Positive column AC plasma display |
| CN1551070A (en) * | 2003-05-16 | 2004-12-01 | 富士通日立等离子显示器股份有限公司 | Plasma display device |
| CN1573856A (en) * | 2003-06-18 | 2005-02-02 | 株式会社日立制作所 | Plasma display device |
| JP2005157338A (en) * | 2003-11-04 | 2005-06-16 | Matsushita Electric Ind Co Ltd | Method of driving plasma display panel and plasma display device |
| US20070205964A1 (en) * | 2004-04-12 | 2007-09-06 | Matsushita Electric Industrial Co., Ltd. | Plasma display panel display device |
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Application publication date: 20130306 |