CN102402938A - Method and device for scanning plasma display screen - Google Patents
Method and device for scanning plasma display screen Download PDFInfo
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- CN102402938A CN102402938A CN2011104511854A CN201110451185A CN102402938A CN 102402938 A CN102402938 A CN 102402938A CN 2011104511854 A CN2011104511854 A CN 2011104511854A CN 201110451185 A CN201110451185 A CN 201110451185A CN 102402938 A CN102402938 A CN 102402938A
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Abstract
The invention discloses a method and device for scanning a plasma display screen. The method comprises the following steps: setting the Y electrode voltage of the lower half part of a plasma display screen to be higher than the Y electrode voltage of the upper half part of the plasma display screen, and starting to scan the upper half part of the plasma display screen; and when finishing scanning the upper half part of the plasma display screen, resetting the lower half part of the plasma display screen, and starting to scan the lower half part of the plasma display screen. The invention solves the problem in related art that the plasma display screen discharges wrongly at high temperature in the addressing period and achieves the technical effect of improving the reliability of discharge of the plasma display screen in the addressing period.
Description
Technical field
The present invention relates to plasma and show the field, in particular to a kind of scan method and device of plasma panel.
Background technology
Color AC-PDP (ac plasma, Alternating Current-Plasma Display Panel are called for short AC-PDP) is based on the ultimate principle development of gas discharge, realizes showing through the ultraviolet excitation light-emitting phosphor that gas discharge sends.At present; Three-electrode surface discharge type AC-PDP is the most competitive a kind of PDP (Plasma Display Panel, Plasmia indicating panel) type, adopts addressing and display separation technology to realize what gray scale showed mostly for this AC-PDP; Promptly; A TV Field is divided into successively luminous 8 or 10 or 12 sub-field, and every sub-field is formed by preparatory stage, address period and the phase of keeping, and just can realize that through the combination of suitable son 256 grades gray scale shows.
Three electrode quadrature shapes of three-electrode surface discharge type AC-PDP are distributed on the front-back baseboard, and discharge is then carried out between two substrates.The prebasal plate horizontal distribution and is kept electrode (X electrode) and scan electrode (Y electrode), and addressing electrode (A electrode) is vertically distributing on metacoxal plate.X electrode and Y electrode are parallel to each other, and with A electrode quadrature.
Fig. 1 is the drive waveforms of first sub-field in the display separation actuation techniques, and is as shown in Figure 1, and the driving process is divided into preparatory stage, address period and keeps the phase.In the preparatory stage, three electrodes cooperatively interact, and wipe the wall electric charge that a son field is left over, and make full frame all display units reach consistent original state, and using two, to wipe be for making full frame consistance better; In address period, driving circuit carries out addressing to each row of Y electrode according to top-down order, writes image coded data at the A electrode simultaneously, and the unit that all will be shown in this child field has accumulated suitable wall electric charge; In the phase of keeping, Y electrode and X electrode alternately add high pressure, make the unit generation discharge that has accumulated the wall electric charge in address period, thereby realize the demonstration of image.
Preparatory stage is when beginning; It all is 0V that three electrodes are attend institute's making alive; But be added on the X electrode because last when finishing of last or the last son field phase of keeping kept pulse, and kept discharge back negative wall electric charge of accumulation on the X electrode, on the Y electrode, accumulated positive wall electric charge; Therefore, on the Y electrode, add wide positive ramp voltage V earlier much larger than firing voltage
Setup(V
Setup≈ 320V), makes between X and Y electrode and discharge, accumulated positive wall electric charge and negative wall electric charge respectively on discharge back X, two electrodes of Y, on the Y electrode, add a wide negative ramp voltage V subsequently
y(V
y≈ 190V), on the X electrode, add a positive voltage V
s(V
s≈ 190V), makes between X and the Y electrode slowly to reach firing voltage, discharge, neutralize wall electric charge positive on X and the Y electrode and negative wall electric charge, make the state of full frame all unit reach the consistent state that extinguishes, the rising ramp voltage V that adds subsequently at last
Setup(V
Setup≈ 190V) with decline ramp voltage V
y(V
y≈ 190V) is better, adds a positive plateau voltage V this moment on the X electrode for the state consistency that makes full frame all discharge cells
b(V
b≈ 100V), the address period of following again just can be addressed to each unit accurately; When the address period end phase of keeping began, X, Y electrode voltage equaled 0V earlier, and the Y electrode voltage equals V then
s, make the voltage of discharge cell reach firing voltage, the discharge beginning, the negative wall electric charge of Y electrode accumulation simultaneously, the wall electric charge that the accumulation of X electrode is positive, the Y electrode voltage becomes 0V subsequently, and the X electrode voltage equals V simultaneously
s, make the voltage of discharge cell reach firing voltage and discharge, the negative wall electric charge of X electrode accumulation simultaneously, the wall electric charge that the accumulation of Y electrode is positive, the X electrode voltage becomes 0V then, and the Y electrode voltage equals V simultaneously
s, carry out a new round and keep discharge.After the phase of keeping finishes, get into the demonstration of next sub-field.
In drive waveforms shown in Figure 1,, scan as adopting progressive scan mode in address period; First row of plasma panel can increase along with the raising of display resolution with the trace interval of last column, owing to the wall electric charge that accumulates on the plasma panel discharge cell can reduce along with the increase of time, and along with the rising of temperature; This minimizing can aggravate; If the minimizing quantity of wall electric charge is big, will influence addressing, occur misplacing.
Occur the problem that high temperature misplaces electricity to correlation technique ionic medium display screen in address period, do not propose effective solution at present as yet.
Summary of the invention
The invention provides a kind of scan method and device of plasma panel, the problem that high temperature misplaces electricity occurs in address period to solve correlation technique ionic medium display screen.
According to an aspect of the present invention, a kind of scan method of plasma panel is provided, has comprised: the Y electrode voltage of the following half screen of plasma panel is set to be higher than the Y electrode voltage of the last half screen of plasma panel, and begins last half screen is scanned; When the end of scan of last half screen, following half screen is resetted, and following half screen is scanned.
Preferably; The step of Y electrode voltage that the Y electrode voltage of the following half screen of plasma panel is set to be higher than the last half screen of plasma panel comprises: control Y electrode drive circuit is exported two groups of control signals; Wherein, Two groups of control signals comprise: first control signal is used to control the Y electrode voltage of half screen; Second control signal is used to control down the Y electrode voltage of half screen.
Preferably, the step that following half screen is resetted comprises: the wall electric charge on the following half screen carries out erasure discharge.
Preferably; The step of Y electrode voltage that the Y electrode voltage of the following half screen of plasma panel is set to be higher than the last half screen of plasma panel comprises: when the reset period of drive waveforms finished, the Y electrode voltage of the following half screen of plasma panel was set to be higher than the Y electrode voltage of half screen.
Preferably; The step that control Y electrode drive circuit is exported two groups of control signals comprises: make through first control signal half screen the Y electrode drive circuit output on half screen a negative edge appears when scanning, and in maintenance high-impedance state when half screen scans down; Make down through second control signal half screen the Y electrode drive circuit output on half screen keep high-impedance state when scanning, and a negative edge is appearring when half screen scans down.
According to a further aspect in the invention, a kind of scanister of plasma panel is provided, has comprised: the unit is set, and the Y electrode voltage of the following half screen of plasma panel is set to be higher than the Y electrode voltage of the last half screen of plasma panel; Scanning element; Be used for Y electrode voltage at the following half screen of plasma panel be set to be higher than plasma panel on after the Y electrode voltage of half screen, begin last half screen is scanned, when the end of scan of last half screen; Following half screen is resetted, and following half screen is scanned.
Preferably, the unit is set comprises: output control module, be used to control the Y electrode drive circuit and export two groups of control signals, wherein, two groups of control signals comprise: first control signal is used to control the Y electrode voltage of half screen; Second control signal is used to control down the Y electrode voltage of half screen.
Preferably, scanning element comprises: wipe module, be used in the process that following half screen is resetted the wall electric charge on the following half screen being carried out erasure discharge.
Preferably, the unit is set comprises: voltage is provided with module, is used for when the reset period of drive waveforms finishes, and the Y electrode voltage of the following half screen of plasma panel is set to be higher than the Y electrode voltage of half screen.
Preferably; Output control module comprises: first controlling sub; Be used for through first control signal make half screen the Y electrode drive circuit output on half screen a negative edge appears when scanning, and keeping high-impedance state when half screen scans down; Second controlling sub, be used for through second control signal make down half screen the Y electrode drive circuit output on half screen keep high-impedance state when scanning, and a negative edge is appearring when half screen scans down.
Through the present invention; Scanning during plasma panel to this plasma display screen on half screen control respectively with following half screen; Thereby down will descend the quantity minimizing of the wall electric charge of half screen to be controlled within certain scope during half screen in scanning; Solved correlation technique ionic medium display screen and the problem that high temperature misplaces electricity occurred, reached the technology of dependability effect that improves the plasma display address discharge in address period.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the drive waveforms according to first sub-field in the display separation actuation techniques in the correlation technique;
Fig. 2 is a kind of preferred process flow diagram according to the scan method of the plasma panel of the embodiment of the invention;
Fig. 3 is a kind of preferred construction block diagram according to the scanister of the plasma panel of the embodiment of the invention;
Fig. 4 is the another kind of preferred construction block diagram according to the scanister of the plasma panel of the embodiment of the invention;
Fig. 5 is according to a kind of Y driving circuit structure figure commonly used in the correlation technique;
Fig. 6 is according to the Y driving circuit structure figure in the scan method of the plasma panel of the embodiment of the invention;
Fig. 7 is according to a kind of preferred drive waveforms in the scan method of the plasma panel of the embodiment of the invention.
Embodiment
Hereinafter will and combine embodiment to specify the present invention with reference to accompanying drawing.Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.
Embodiment 1
The invention provides a kind of scan method of plasma panel, concrete, as shown in Figure 2, this method comprises:
S202, the Y electrode voltage of the following half screen of plasma panel are set to be higher than the Y electrode voltage of the last half screen of plasma panel, and begin last half screen is scanned;
S204 when the end of scan of last half screen, resets to following half screen, and following half screen is scanned.
In the above-mentioned embodiment; Scanning during plasma panel to this plasma display screen on half screen control respectively with following half screen; Thereby down will descend the quantity minimizing of the wall electric charge of half screen to be controlled within certain scope during half screen in scanning; Solved correlation technique ionic medium display screen and the problem that high temperature misplaces electricity occurred, reached the technology of dependability effect that improves the plasma display address discharge in address period.
The present invention also provides the preferred scheme of the Y electrode voltage of the last half screen that a kind of Y electrode voltage of following half screen of plasma panel is set to be higher than plasma panel; Concrete; This scheme comprises: control Y electrode drive circuit is exported two groups of control signals; Wherein, two groups of control signals comprise: first control signal is used to control the Y electrode voltage of half screen; Second control signal is used to control down the Y electrode voltage of half screen.In the above-mentioned optimal technical scheme, control the Y electrode, realized controlling respectively the last half screen of plasma display Y electrode and the technique effect of following half screen through exporting two groups of control signals.
Preferably, the step that following half screen is resetted comprises: the wall electric charge on the following half screen carries out erasure discharge.Through to descending the wall electric charge on the half screen to carry out erasure discharge, the quantity of descending the wall electric charge on the half screen is reduced to can accomplish address discharge, guarantee the smooth completion of addressing process.
The present invention also provides the scheme of the Y electrode voltage of the last half screen that a kind of Y electrode voltage of following half screen of preferred plasma panel is set to be higher than plasma panel; Concrete; This scheme comprises: when the reset period of drive waveforms finished, the Y electrode voltage of the following half screen of plasma panel was set to be higher than the Y electrode voltage of half screen.Implement technique scheme when finishing, guarantee that the quantity that has just controlled the wall electric charge on time half screen in the address period incipient stage reduces, and the problem that high temperature misplaces electricity occurs thereby further solved effectively in address period through reset period in drive waveforms.
The present invention also provides a kind of Y of control electrode drive circuit to export the scheme of two groups of control signals; Concrete; As shown in Figure 7; This scheme comprises: make through first control signal half screen the Y electrode drive circuit output on half screen a negative edge appears when scanning, and keeping high-impedance state when half screen scans down; Make down through second control signal half screen the Y electrode drive circuit output on half screen keep high-impedance state when scanning, and a negative edge is appearring when half screen scans down.Through the enforcement of technique scheme, guarantee that the Y electrode voltage of the following half screen of plasma panel is higher than the Y electrode voltage of half screen when the reset period of drive waveforms finishes, thereby avoided plasma display to misplace the problem of electricity at address period high temperature effectively.
Embodiment 2
The invention provides a kind of scanister of plasma panel; Concrete; As shown in Figure 3, this device comprises: unit 302 is set, and the Y electrode voltage that is used for the following half screen of plasma panel is set to be higher than the Y electrode voltage of the last half screen of plasma panel; Scanning element 304; Be used for Y electrode voltage at the following half screen of plasma panel be set to be higher than plasma panel on after the Y electrode voltage of half screen, begin last half screen is scanned, when the end of scan of last half screen; Following half screen is resetted, and following half screen is scanned.
In the above-mentioned embodiment; Scanning during plasma panel to this plasma display screen on half screen control respectively with following half screen; Thereby down will descend the quantity minimizing of the wall electric charge of half screen to be controlled within certain scope during half screen in scanning; Solved correlation technique ionic medium display screen and the problem that high temperature misplaces electricity occurred, improved the reliability of plasma display address discharge in address period.
The present invention also improves the above-mentioned unit 302 that is provided with; Concrete, as shown in Figure 4, unit 302 is set comprises: output control module 3022; Be used to control the Y electrode drive circuit and export two groups of control signals; Wherein, two groups of control signals comprise: first control signal is used to control the Y electrode voltage of half screen; Second control signal is used to control down the Y electrode voltage of half screen.In the above-mentioned optimal technical scheme, control the Y electrode, realized controlling respectively the last half screen of plasma display Y electrode and the technique effect of following half screen through two groups of control signals of output control module 3022 outputs.
The present invention also improves above-mentioned scanning element 304, and preferred, as shown in Figure 4, scanning element 304 comprises: wipe module 3042, be used in the process that following half screen is resetted the wall electric charge on the following half screen being carried out erasure discharge.Wall electric charge through wiping on 3042 pairs of following half screens of module carries out erasure discharge, the quantity of descending the wall electric charge on the half screen is reduced to can accomplish address discharge, guarantees the smooth completion of addressing process.
The present invention has also carried out further improvement to unit 302 is set; Concrete; As shown in Figure 4; Unit 302 is set to be comprised: voltage is provided with module 3024, is used for when the reset period of drive waveforms finishes, and the Y electrode voltage of the following half screen of plasma panel is set to be higher than the Y electrode voltage of half screen.The enforcement of above-mentioned optimal technical scheme guarantees that the quantity that has just controlled the wall electric charge on time half screen in the address period incipient stage reduces, and the problem that high temperature misplaces electricity occurs thereby further solved effectively in address period.
The present invention also improves output control module 3022; Concrete; As shown in Figure 4; Output control module 3022 comprises: first controlling sub 30222, be used for through first control signal make half screen the Y electrode drive circuit output on half screen a negative edge appears when scanning, and keeping high-impedance state when half screen scans down; Second controlling sub 30224, be used for through second control signal make down half screen the Y electrode drive circuit output on half screen keep high-impedance state when scanning, and a negative edge is appearring when half screen scans down.The enforcement of technique scheme guarantees that the Y electrode voltage of the following half screen of plasma panel is higher than the Y electrode voltage of half screen when the reset period of drive waveforms finishes, thereby has avoided plasma display to misplace the problem of electricity at address period high temperature effectively.
Embodiment 3
The invention provides a kind of improved Y driving circuit and drive waveforms, explanation for ease, following image resolution ratio is that example is explained with 1920*1080.
Fig. 5 is a kind of Y driving circuit structure synoptic diagram of plasma panel commonly used, and wherein, the dotted portion from Fig. 5 can find out that Y driving circuit output control is to be accomplished by one group of control signal; Fig. 6 is a kind of improved Y driving circuit structure synoptic diagram provided by the invention; In improved plan, plasma panel is divided into upper and lower half screen, and controls the last half screen and following half screen of ion display screen respectively; Wherein, Dotted portion can be found out among Fig. 6, and the output control of Y driving circuit is accomplished by two groups of control signals, realizes the control respectively of the upper and lower half screen of plasma panel.
Fig. 7 is the part drive waveforms after the present invention improves; Have only reset period (preferred, reset period can be the rear half stage of preparatory stage among Fig. 1) and address period, wherein; YOUT U representes the drive waveforms of the last half screen Y electrode of plasma panel; YOUT D representes the drive waveforms of the following half screen Y electrode of plasma panel, and AOUT representes the drive waveforms of plasma panel addressing electrode, and XOUT representes the drive waveforms of plasma panel X electrode.When the reset period of drive waveforms finishes, make the Y electrode voltage of the following half screen of plasma panel be higher than the Y electrode voltage of half screen, make wall electric charge that half screen X, Y electrode down keep wall electric charge greater than last half screen X, the reservation of Y electrode.
When descending half screen to reset, last half screen control makes YOUT_U be output as drive waveforms shown in Figure 7, when following half screen soon finishes at reset period Y electrode decline oblique wave; Make the output of Y driving circuit keep high-impedance state through the control signal effect; Because this moment, the X driving circuit also was in high-impedance state, the decline oblique wave that can form half screen Y electrode drags down the voltage of X electrode downwards, owing to all X electrodes of display screen connect together; The X electrode will descend the Y electrode voltage of half screen to drag down again; This is because the electric capacity of X, Y electrode causes, under the effect that control signal and these interelectrode capacitance voltages can not suddenly change, realizes the drive waveforms of YOUT_D as shown in Figure 7, XOUT; Make down half screen Y electrode voltage when resetting end, be higher than half screen Y electrode voltage; Because the decline oblique wave of reset period is an erasure discharge, following half screen voltage is higher than half screen voltage, and the wall electric charge under making in the half screen discharge cell is higher than the wall electric charge of half screen discharge cell.Behind the last half screen end of scan, following half screen resets, because this moment, down the wall charge ratio on the half screen was more, need carry out erasure discharge, the quantity of wall electric charge is reduced to can accomplish address discharge.Through upper and lower half screen is controlled respectively; Behind the last half screen end of scan; Control half screen down resets, and the longest interval of end rear wall charge retention time that will reset shortens to 539 scanning impulses by 1079 scanning impulses, reduces the minimizing of wall electric charge; Improve the reliability of address discharge, reduce because of the discharge cell inner wall charge increases the addressing that brings with temperature rising minimizing in time misplacing film sound.
From above description, can find out that the present invention controls respectively through display screen being divided into shield up and down; When the reset period of drive waveforms finishes, make down the Y electrode voltage of half screen be higher than the Y electrode voltage of half screen, behind the last half screen end of scan; Following half screen is resetted; Descend half screen scanning then, solved correlation technique ionic medium display screen and the problem that high temperature misplaces electricity occurred, reached the technology of dependability effect that improves the plasma display address discharge in address period.
Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the memory storage and carry out, and in some cases, can carry out step shown or that describe with the order that is different from here by calculation element; Perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the scan method of a plasma panel is characterized in that, comprising:
The Y electrode voltage of the following half screen of plasma panel is set to be higher than the Y electrode voltage of the last half screen of said plasma panel, and begins the said half screen of going up is scanned;
On said, during the end of scan of half screen, said half screen is down resetted, and said half screen is down scanned.
2. method according to claim 1 is characterized in that, the step of Y electrode voltage that the Y electrode voltage of the following half screen of plasma panel is set to be higher than the last half screen of said plasma panel comprises:
Control Y electrode drive circuit is exported two groups of control signals, and wherein, said two groups of control signals comprise: first control signal is used to control the said Y electrode voltage of going up half screen; Second control signal is used to control the said Y electrode voltage of half screen down.
3. method according to claim 1 is characterized in that, the step that said half screen is down resetted comprises:
Wall electric charge on the said half screen down carries out erasure discharge.
4. method according to claim 1 and 2 is characterized in that, the step of Y electrode voltage that the Y electrode voltage of the following half screen of plasma panel is set to be higher than the last half screen of said plasma panel comprises:
When the reset period of drive waveforms finished, the Y electrode voltage of the following half screen of said plasma panel was set to be higher than the said Y electrode voltage of going up half screen.
5. method according to claim 2 is characterized in that, the step that control Y electrode drive circuit is exported two groups of control signals comprises:
Make said output of going up the Y electrode drive circuit of half screen a negative edge when half screen on said is scanned, occur through said first control signal, and when half screen under said is scanned, keep high-impedance state;
Make the said output of the Y electrode drive circuit of half screen down when half screen on said is scanned, keep high-impedance state through said second control signal, and when half screen under said is scanned, a negative edge occurs.
6. the scanister of a plasma panel is characterized in that, comprising:
The unit is set, and the Y electrode voltage that is used for the following half screen of plasma panel is set to be higher than the Y electrode voltage of the last half screen of said plasma panel;
Scanning element; Be used for Y electrode voltage at the following half screen of plasma panel be set to be higher than said plasma panel on after the Y electrode voltage of half screen; Begin the said half screen of going up is scanned; On said, during the end of scan of half screen, said half screen is down resetted, and said half screen is down scanned.
7. device according to claim 6 is characterized in that, the said unit that is provided with comprises:
Output control module is used to control the Y electrode drive circuit and exports two groups of control signals, and wherein, said two groups of control signals comprise: first control signal is used to control the said Y electrode voltage of going up half screen; Second control signal is used to control the said Y electrode voltage of half screen down.
8. device according to claim 6 is characterized in that, said scanning element comprises:
Wipe module, be used for the wall electric charge on the said half screen down being carried out erasure discharge in the process that said half screen is down resetted.
9. according to claim 6 or 7 described devices, it is characterized in that the said unit that is provided with comprises:
Voltage is provided with module, is used for when the reset period of drive waveforms finishes, and the Y electrode voltage of the following half screen of said plasma panel is set to be higher than the said Y electrode voltage of going up half screen.
10. device according to claim 7 is characterized in that, said output control module comprises:
First controlling sub is used for making said output of going up the Y electrode drive circuit of half screen a negative edge when half screen on said is scanned, occur through said first control signal, and when half screen under said is scanned, keeps high-impedance state;
Second controlling sub is used for making the said output of the Y electrode drive circuit of half screen down when half screen on said is scanned, keep high-impedance state through said second control signal, and when half screen under said is scanned, a negative edge occurs.
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Application publication date: 20120404 |