CN100370499C - AC plasma display screen maintaining drive method - Google Patents
AC plasma display screen maintaining drive method Download PDFInfo
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- CN100370499C CN100370499C CNB200410073524XA CN200410073524A CN100370499C CN 100370499 C CN100370499 C CN 100370499C CN B200410073524X A CNB200410073524X A CN B200410073524XA CN 200410073524 A CN200410073524 A CN 200410073524A CN 100370499 C CN100370499 C CN 100370499C
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Abstract
The present invention discloses a method for maintaining and driving an AC plasma display screen. A positive impulse sequence is alternately executed between a scanning electrode and a maintaining electrode of the present invention, when the voltage of the scanning electrode or the maintaining electrode is changed from positive impulse voltage to zero or from zero to the positive impulse voltage, the connection of electricity and air of the maintaining electrode or the scanning electrode is broken to maintain a high-resistance state, and thereby, the loss of wall charges in units during two-time maintaining discharge is prevented; the margin of AC-PDP maintaining voltage and the stability of maintaining discharge are enhanced, and simultaneously, the maintaining voltage can be reduced.
Description
Technical field
The present invention relates to a kind of AC plasma display screen (hereinafter to be referred as AC-PDP) field, relate in particular to a kind of driving method of keeping of AC plasma display screen.
Background technology
General plasma display panel (PDP) all adopts AC type three-electrode surface discharge structure at present.The discharge cell of AC-PDP is only lighted and is extinguished two states, and in order to use the AC-PDP gray scale images, the sub-field technology of addressing display separation (hereinafter to be referred as ADS) is adopted widely.In the ADS technology, the demonstration of a two field picture is divided into several height field and carries out.With 8 son fields is example, one two field picture is divided into 8 son fields and shows, 8 son weights are encoded to [1248163264128], because the frequency of led pulse is very high, integral characteristic according to human eye, brightness sensation to each son also satisfies this proportionate relationship, and wherein each son field can be controlled luminously or not luminous separately, and adopting the luminous and not luminous of each son of control is the demonstration of 256 gray levels of realization capable of being combined.In order to control the whether luminous of son, each son field is divided into 3 phases: preparatory stage, address period and keep the phase.Preparatory stage makes that all discharge cells reach consistent state among the AC-PDP, for addressing with show ready.Address period makes among the AC-PDP each discharge cell enter to light according to view data or extinguishes state.The phase of keeping is kept discharge to all discharge cells, and the unit of illuminating state is luminous, and the unit that extinguishes state is not luminous.
AC-PDP keeps discharge at the scan electrode of coplane with keep between the electrode and carry out.For the unit that is in illuminating state in address period, because the existence of this unit mesospore electric charge, to give scan electrode and keep electrode in the phase of keeping alternately to apply and keep pulse, discharge is constantly kept in this unit.For being in the unit that extinguishes state in address period, because there is not the wall electric charge in this unit, to give scan electrode and keep electrode in the phase of keeping alternately to apply and keep pulse, discharge can not kept in this unit.
Keep driving method for tradition, there are three kinds of states in discharge cell institute making alive: positive voltage state, zero-voltage state, negative voltage state.In chronological order, positive voltage state and negative voltage state are alternately arranged, and zero-voltage state is between positive voltage state and the negative voltage state.For the unit of illuminating state, at positive voltage state and negative voltage state, all can discharge, and accumulation wall electric charge.The key of AC-PDP AC driving, the wall voltage that is produced by the wall electric charge is kept the voltage stack with adding exactly, makes total voltage that the unit adds surpass firing voltage and keeps discharge, keeps voltage thereby reduction adds.Keep in the driving method in tradition, when discharge cell is in zero-voltage state, the wall loss of charge can take place, thus the decline that causes keeping the instability of discharge next time and keep the voltage headroom degree.
Summary of the invention
The objective of the invention is to propose a kind of AC plasma display screen maintaining drive method, the loss of wall electric charge when preventing zero-voltage state, thus improve the stability of keeping discharge and keep the voltage headroom degree.
During technical scheme of the present invention is achieved in that and keeps, at scan electrode with keep electrode and alternately apply the positive pulse sequence, when scan electrode with keep voltage difference between the electrode when keeping voltage Vs and descend, disconnect scan electrode or keep being electrically connected of electrode and make it keep high-impedance state.
Keep for one and comprise the positive pulse that alternately appears on the scan electrode in the cycle and keep a positive pulse on the electrode,, disconnect and keep being electrically connected of electrode, keep high-impedance state when keeping pulse when keeping voltage Vs and reduce to zero on the scan electrode; On keeping electrode, keep pulse when keeping voltage Vs and reduce to zero, disconnect the connection of scan electrode, keep high-impedance state.
Keep for one and comprise the positive pulse that alternately appears on the scan electrode in the cycle and keep a positive pulse on the electrode, the pulse of keeping on keeping electrode reduces to zero or be upgraded to when keeping voltage Vs by above freezing by keeping voltage Vs, disconnect being electrically connected of scan electrode, keep high-impedance state.
Keep for one and comprise the positive pulse that alternately appears on the scan electrode in the cycle and keep a positive pulse on the electrode, when the pulse of keeping on the scan electrode reduces to zero or be upgraded to when keeping voltage Vs by above freezing by keeping voltage Vs, being electrically connected of electrode kept in disconnection, keeps high-impedance state.
Keep for one and comprise the positive pulse that alternately appears on the scan electrode in the cycle and keep a positive pulse on the electrode,, disconnect and keep being electrically connected of electrode, keep high-impedance state when the pulse of keeping on the scan electrode is upgraded to when keeping voltage Vs by above freezing; The pulse of keeping on keeping electrode is upgraded to when keeping voltage Vs by above freezing, disconnects being electrically connected of scan electrode, keeps high-impedance state.
The present invention has adopted show electrode to keep high-impedance state to prevent the loss of wall electric charge between the phase of keeping twice discharge process, thereby has improved the stability of keeping the voltage headroom degree and keeping discharge.
Description of drawings
Fig. 1 is that the high resistant that the present invention proposes is kept drive pulse waveform;
Fig. 2 is the comparison diagram of wall electric charge size when adopting tradition to keep high resistant that driving method and the present invention propose respectively to keep driving method;
Fig. 3 adopts tradition to keep the comparison diagram of keeping voltage headroom degree size when high resistant that driving method and the present invention propose is kept driving method respectively;
Fig. 4 is one of embodiments of the invention;
Fig. 5 is when adopting circuit shown in Figure 4, the sequential chart of each switch conduction;
Fig. 6 is two of embodiments of the invention;
Fig. 7 is when adopting circuit shown in Figure 6, the sequential chart of each switch conduction;
Fig. 8 is three of embodiments of the invention;
Fig. 9 is when adopting circuit shown in Figure 8, the sequential chart of each switch conduction;
Figure 10 is four of embodiments of the invention;
Figure 11 is when adopting circuit shown in Figure 10, the sequential chart of each switch conduction;
Figure 12 is five of embodiments of the invention;
Figure 13 is when adopting circuit shown in Figure 12, the sequential chart of each switch conduction.
Embodiment
Accompanying drawing is specific embodiments of the invention;
Below in conjunction with embodiment content of the present invention is described further:
With reference to shown in Figure 1, for the high resistant that the present invention proposes is kept drive pulse waveform.Cycle of keeping comprises scan electrode (Y electrode) and keeps each one at electrode (X electrode) and keep voltage (Vs) pulse.When scan electrode (Y electrode) applies when keeping voltage (Vs) pulse, to keep electrode (X electrode) and remain no-voltage, once discharge takes place in the AC-PDP discharge cell, carries out once luminous; Apply when keeping voltage (Vs) pulse when keeping electrode (X electrode), scan electrode (Y electrode) remains no-voltage, and the AC-PDP discharge cell takes place once to discharge again, and it is luminous to carry out another time., keep electrode (X electrode) and remain high-impedance state when keeping voltage (Vs) and reduce to zero at scan electrode (Y electrode) voltage, at this moment, scan electrode and keep electrode and do not have the galvanic circle does not have the loss of wall electric charge.When keeping electrode (X electrode) voltage when keeping voltage (Vs) and reduce to zero, scan electrode (Y electrode) remains high-impedance state, and at this moment, scan electrode and keep electrode and do not have the galvanic circle does not have the wall loss of charge yet.Like this, utilize high resistant to keep driving method, prevented the wall loss of charge between twice discharge effectively, significantly improved the stability of keeping the voltage headroom degree and keeping discharge.
With reference to shown in Figure 2, be the comparison diagram of wall electric charge size when adopting tradition to keep high resistant that driving method and the present invention propose respectively to keep driving method.As can be seen from the figure, the high resistant that adopts the present invention to propose is kept driving method, and same keeping under the voltage, the wall electric charge is significantly improved.
With reference to shown in Figure 3, be when adopting tradition to keep high resistant that driving method and the present invention propose respectively to keep driving method, under different addressing voltages, keep voltage headroom degree comparison diagram.As can be seen from the figure, the high resistant that proposes of the present invention is kept driving method and can be increased significantly and keep the voltage headroom degree.
With reference to shown in Figure 4, the drive waveforms generating means of keeping of the present invention comprises Y electrode holding circuit 101 that is used for scan electrode and 102 two parts of X electrode holding circuit that are used to keep electrode.Y electrode holding circuit 101 is by switch S 11, S12, S13, S14, S15, inductance L 11, and capacitor C 11, diode D11, D12 constitute.X electrode holding circuit is by switch S 21, S22, S23, S24, S25, inductance L 21, and capacitor C 21, diode D21, D22 constitute.In Y electrode holding circuit 101, capacitor C 11 1 ends are connected to ground, and the other end is by parallel circuit 103, and inductance L 11, switch S 15 are connected to PDP screen scan electrode.Diode D11 connects with switch S 13, and diode D12 connects with switch S 14, the two formation parallel circuit 103 in parallel again.Power supply Vs is connected to AC-PDP display screen scan electrode by switch S 11, S15.Switch S 12 1 ends are connected to ground, and the other end is connected to AC-PDP display screen scan electrode by switch S 15.In X electrode holding circuit 102, capacitor C 21 1 ends are connected to ground, and the other end passes through parallel circuit 104, inductance L 21, and switch S 25 is connected to the AC-PDP display screen and keeps electrode.Diode D21 connects with switch S 23, and diode D22 connects with switch S 24, the two formation parallel circuit 104 in parallel again.Power supply Vs is connected to the AC-PDP display screen by switch S 21, S25 and keeps electrode.Switch S 22 1 ends are connected to ground, and the other end is connected to the AC-PDP display screen by switch S 25 and keeps electrode.
Fig. 5 is the switch conduction sequential chart of one of embodiment of the invention.From t
1To t
11Being one keeps the cycle.There is shown the conducting sequential chart and the corresponding scan electrode of each switch among one of embodiment and keep electrode and keep waveform.t
1-t
2Each switch conduction state is: S13, S15, S22, S25 closure, other switches disconnect.At this moment, Y electrode holding circuit connects AC-PDP display screen scan electrode to capacitor C 11 through diode D11, switch S 13, inductance L 11, switch S 15, and capacitor C 11 is given the charging of AC-PDP display screen.X electrode holding circuit is kept electrode through switch S 25, S22 with the AC-PDP display screen and is connected to ground, and the AC-PDP display screen is kept electrode and kept no-voltage.t
2-t
3Each switch conduction state is: S11, S15, S22, S25 closure, other switches disconnect.At this moment, Y electrode holding circuit is connected to power supply Vs through switch S 11, S15 with AC-PDP display screen scan electrode, AC-PDP display screen scan electrode sustaining voltage Vs.X electrode holding circuit is kept electrode through switch S 25, S22 with the AC-PDP display screen and is connected to ground, and the AC-PDP display screen is kept electrode and kept no-voltage.t
3-t
4Each switch conduction state is: S11, S15, S22 closure, other switches disconnect.At this moment, Y electrode holding circuit is connected to power supply Vs through switch S 11, S15 with AC-PDP display screen scan electrode, AC-PDP display screen scan electrode sustaining voltage Vs.X electrode holding circuit disconnects keeps being connected of electrode with the AC-PDP display screen, and the AC-PDP display screen is kept electrode and entered high-impedance state.t
4-t
5Each switch conduction state is: S14, S15, S22 closure, other switches disconnect.At this moment, Y electrode holding circuit is through switch S 15, inductance L 11, switch S 14, and diode D12 is connected to capacitor C 11 with AC-PDP display screen scan electrode, and the AC-PDP display screen gives capacitor C 11 chargings.X electrode holding circuit disconnects keeps being connected of electrode with the AC-PDP display screen, and the AC-PDP display screen is kept electrode and kept high-impedance state.t
5-t
6Each switch conduction state is: S12, S15, S22 closure, other switches disconnect.At this moment, Y electrode holding circuit is connected to ground through switch S 15, switch S 12 with AC-PDP display screen scan electrode, and AC-PDP display screen scan electrode keeps no-voltage.X electrode holding circuit disconnects keeps being connected of electrode with the AC-PDP display screen, and the AC-PDP display screen is kept electrode and kept high-impedance state.t
6-t
7Each switch conduction state is: S12, S15, S23, S25 closure, other switches disconnect.At this moment, Y electrode holding circuit is connected to ground through switch S 15, S12 with AC-PDP display screen scan electrode, and AC-PDP display screen scan electrode keeps no-voltage.X electrode holding circuit is through switch S 25, inductance L 11, switch S 23, and diode D21 connects the AC-PDP display screen and keeps electrode to capacitor C 21, and capacitor C 21 is given the charging of AC-PDP display screen.t
7-t
8Each switch conduction state is: S12, S15, S21, S25 closure, other switches disconnect.At this moment, Y electrode holding circuit is connected to ground through switch S 15, S12 with AC-PDP display screen scan electrode, and AC-PDP display screen scan electrode keeps no-voltage.X electrode holding circuit connects the AC-PDP display screen through switch S 25, S21 and keeps electrode to power supply Vs, and the AC-PDP display screen is kept electrode sustaining voltage Vs.t
8-t
9Each switch conduction state is: S12, S21, S25 closure, other switches disconnect.At this moment, Y electrode holding circuit disconnects the connection of AC-PDP display screen scan electrode, and AC-PDP display screen scan electrode keeps high-impedance state.X electrode holding circuit connects the AC-PDP display screen through switch S 25, S21 and keeps electrode to power supply Vs, and the AC-PDP display screen is kept electrode sustaining voltage Vs.t
9-t
10Each switch conduction state is: S12, S24, S25 closure, other switches disconnect.At this moment, Y electrode holding circuit disconnects the connection of AC-PDP display screen scan electrode, and AC-PDP display screen scan electrode keeps high-impedance state.X electrode holding circuit is through switch S 25, inductance L 21, switch S 24, and diode D22 connects the AC-PDP display screen and keeps electrode to capacitor C 21, and the AC-PDP display screen gives capacitor C 21 chargings.t
10-t
11Each switch conduction state is: S12, S22, S25 closure, other switches disconnect.At this moment, Y electrode holding circuit disconnects the connection of AC-PDP display screen scan electrode, and AC-PDP display screen scan electrode keeps high-impedance state.X electrode holding circuit connects the AC-PDP display screen through switch S 25, S22 and keeps electrode to ground, and the AC-PDP display screen is kept electrode and kept no-voltage.So just having finished one keeps the cycle.
Fig. 6 is two of embodiments of the invention.
Keep (102) two parts of X electrode holding circuit that the drive waveforms generating means comprises the Y electrode holding circuit (101) that is used for scan electrode and is used to keep electrode.Y electrode holding circuit is by switch S 11, S12, S13, S14, S15, inductance L 11, and capacitor C 11, diode D11, D12 constitute.X electrode holding circuit is by switch S 21, S22, S23, S24, inductance L 21, and capacitor C 21, diode D21, D22 constitute.In Y electrode holding circuit 101, capacitor C 11 1 ends are connected to ground, and the other end is by parallel circuit 103, and inductance L 11, switch S 15 are connected to PDP screen scan electrode.Diode D11 connects with switch S 13, and diode D12 connects with switch S 14, the two formation parallel circuit 103 in parallel again.Power supply Vs is connected to AC-PDP display screen scan electrode by switch S 11, S15.Switch S 12 1 ends are connected to ground, and the other end is connected to AC-PDP display screen scan electrode by switch S 15.In X electrode holding circuit 102, capacitor C 21 1 ends are connected to ground, and the other end is by parallel circuit 104, and inductance L 21 is connected to the AC-PDP display screen and keeps electrode.Diode D21 connects with switch S 23, and diode D22 connects with switch S 24, the two formation parallel circuit 104 in parallel again.Power supply Vs is connected to the AC-PDP display screen by switch S 21 and keeps electrode, and switch S 22 1 ends are connected to ground, and the other end is connected to the AC-PDP display screen and keeps electrode.
Fig. 7 is two a switch conduction sequential chart of the embodiment of the invention.From t
1To t
11Being one keeps the cycle.There is shown embodiment two in each switch conducting sequential chart and corresponding scan electrode and keep electrode and keep waveform.t
1-t
2Each switch conduction state is: S13, S15, S22 closure, other switches disconnect.At this moment, Y electrode holding circuit connects AC-PDP display screen scan electrode to capacitor C 11 through diode D11, switch S 13, inductance L 11, switch S 15, and capacitor C 11 is given the charging of AC-PDP display screen.X electrode holding circuit is kept electrode through switch S 22 with the AC-PDP display screen and is connected to ground, and the AC-PDP display screen is kept electrode and kept no-voltage.t
2-t
3Each switch conduction state is: S11, S15, S22 closure, other switches disconnect.At this moment, Y electrode holding circuit is connected to Vs by switch S 11, S15 with AC-PDP display screen scan electrode, AC-PDP display screen scan electrode sustaining voltage Vs.X electrode holding circuit is kept electrode through switch S 22 with the AC-PDP display screen and is connected to ground, and the AC-PDP display screen is kept electrode and kept no-voltage.t
3-t
4Each switch conduction state is: S11, S22 closure, other switches disconnect.At this moment, Y electrode holding circuit disconnects the connection of AC-PDP display screen scan electrode, AC-PDP display screen scan electrode enters high-impedance state, and X electrode holding circuit connects the AC-PDP display screen through switch S 22 and keeps the electrode electrode to ground, and the AC-PDP display screen is kept electrode and kept no-voltage.t
4-t
5Each switch conduction state is: S11, S23 closure, other switches disconnect.At this moment, Y electrode holding circuit disconnects the connection of AC-PDP display screen scan electrode, and AC-PDP display screen scan electrode keeps high-impedance state.X electrode holding circuit connects the AC-PDP display screen through inductance L 11, switch S 23, diode D21 and keeps electrode to capacitor C 21, and capacitor C 21 is given the charging of AC-PDP display screen.t
5-t
6Each switch conduction state is: S11, S21 closure, other switches disconnect.At this moment, Y electrode holding circuit disconnects the connection of AC-PDP display screen scan electrode, and AC-PDP display screen scan electrode keeps high-impedance state.X electrode holding circuit connects the AC-PDP display screen through switch S 21 and keeps electrode to power supply Vs, and the AC-PDP display screen is kept electrode sustaining voltage Vs.t
6-t
7Each switch conduction state is: S14, S15, S21 closure, other switches disconnect.At this moment, Y electrode holding circuit is through switch S 15, inductance L 11, switch S 14, and diode D12 is connected to capacitor C 11 with AC-PDP display screen scan electrode, and the AC-PDP display screen gives capacitor C 11 chargings.X electrode holding circuit connects the AC-PDP display screen through switch S 21 and keeps electrode to power supply Vs, and the AC-PDP display screen is kept electrode sustaining voltage Vs.t
7-t
8Each switch conduction state is: S12, S15, S21 closure, other switches disconnect.At this moment, Y electrode holding circuit is connected to ground through switch S 15, S12 with AC-PDP display screen scan electrode, and AC-PDP display screen scan electrode keeps no-voltage.X electrode holding circuit connects the AC-PDP display screen through switch S 21 and keeps electrode to power supply Vs, and the AC-PDP display screen is kept electrode sustaining voltage Vs.t
8-t
9Each switch conduction state is: S12, S21 closure, other switches disconnect.At this moment, Y electrode holding circuit disconnects the connection of AC-PDP display screen scan electrode, and AC-PDP display screen scan electrode keeps high-impedance state.The X electrode drive circuit connects the AC-PDP display screen through switch S 21 and keeps electrode to power supply Vs, and the AC-PDP display screen is kept electrode sustaining voltage Vs.t
9-t
10Each switch conduction state is: S12, S24 closure, other switches disconnect.At this moment, Y electrode holding circuit disconnects the connection of AC-PDP display screen scan electrode, and AC-PDP display screen scan electrode keeps high-impedance state.X electrode holding circuit connects the AC-PDP display screen through inductance L 21, switch S 24, diode D22 and keeps electrode to capacitor C 21, and the AC-PDP display screen gives capacitor C 21 chargings.t
10-t
11Each switch conduction state is: S12, S22 closure, other switches disconnect.At this moment, Y electrode holding circuit disconnects the connection of AC-PDP display screen scan electrode, and AC-PDP display screen scan electrode keeps high resistant.X electrode holding circuit connects the AC-PDP display screen through switch S 22 and keeps electrode to ground, and the AC-PDP display screen is kept electrode and kept no-voltage.So just having finished one keeps the cycle.
Fig. 8 is three of embodiments of the invention.
Keep (102) two parts of X electrode holding circuit that the drive waveforms generating means comprises the Y electrode holding circuit (101) that is used for scan electrode and is used to keep electrode.Y electrode holding circuit is by switch S 11, S12, S13, S14, inductance L 11, and capacitor C 11, diode D11, D12 constitute.X electrode holding circuit is by switch S 21, S22, S23, S24, S25, inductance L 21, and capacitor C 21, diode D21, D22 constitute.In Y electrode holding circuit 101, capacitor C 11 1 ends are connected to ground, and the other end is by parallel circuit 103, and inductance L 11 is connected to PDP screen scan electrode.Diode D11 connects with switch S 13, and diode D12 connects with switch S 14, the two formation parallel circuit 103 in parallel again.Power supply Vs is connected to AC-PDP display screen scan electrode by switch S 11, and switch S 12 1 ends are connected to ground, and the other end is connected to AC-PDP display screen scan electrode.In X electrode holding circuit 102, capacitor C 21 1 ends are connected to ground, and the other end is by parallel circuit 104, and inductance L 21, switch S 25 are connected to the PDP screen and keep electrode.Diode D21 connects with switch S 23, and diode D22 connects with switch S 24, the two formation parallel circuit 104 in parallel again.Power supply Vs is connected to the AC-PDP display screen by switch S 21, S25 and keeps electrode.Switch S 22 1 ends are connected to ground, and the other end is connected to the AC-PDP display screen by switch S 25 and keeps electrode.
Fig. 9 is three a switch conduction sequential chart of the embodiment of the invention.From t
1To t
11Being one keeps the cycle.There is shown embodiment three in each switch conducting sequential chart and corresponding scan electrode and keep electrode and keep waveform.t
1-t
2Each switch conduction state is: S23, S25, S12 closure, other switches disconnect.At this moment, X electrode holding circuit connects the AC-PDP display screen through diode D21, switch S 23, inductance L 21, switch S 25 and keeps electrode to capacitor C 21, and capacitor C 21 is given the charging of AC-PDP display screen.Y electrode holding circuit is connected to ground through switch S 12 with AC-PDP display screen scan electrode, and AC-PDP display screen scan electrode keeps no-voltage.t
2-t
3Each switch conduction state is: S21, S25, S12 closure, other switches disconnect.At this moment, X electrode holding circuit is kept electrode through switch S 21, switch S 25 with the AC-PDP display screen and is connected to Vs, and the AC-PDP display screen is kept electrode sustaining voltage Vs.Y electrode holding circuit is connected to ground through switch S 12 with AC-PDP display screen scan electrode, and AC-PDP display screen scan electrode keeps no-voltage.t
3-t
4Each switch conduction state is: S21, S12 closure, other switches disconnect.At this moment, X electrode holding circuit disconnects the connection that the AC-PDP display screen is kept electrode, and the AC-PDP display screen is kept electrode and entered high-impedance state.Y electrode holding circuit connects AC-PDP display screen scan electrode to ground through switch S 12, and AC-PDP display screen scan electrode keeps no-voltage.t
4-t
5Each switch conduction state is: S21, S13 closure, other switches disconnect.At this moment, X electrode holding circuit disconnects the connection that the AC-PDP display screen is kept electrode, and the AC-PDP display screen is kept electrode and kept high-impedance state.Y electrode holding circuit connects AC-PDP display screen scan electrode to capacitor C 11 by inductance L 11, switch S 13, diode D11, and capacitor C 11 is given the charging of AC-PDP display screen.t
5-t
6Each switch conduction state is: S21, S11 closure, other switches disconnect.At this moment, X electrode holding circuit disconnects the connection that the AC-PDP display screen is kept electrode, and the AC-PDP display screen is kept electrode and kept high-impedance state.Y electrode holding circuit connects AC-PDP display screen scan electrode to power supply Vs through switch S 11, AC-PDP display screen scan electrode sustaining voltage Vs.t
6-t
7Each switch conduction state is: S24, S25, S11 closure, other switches disconnect.At this moment, X electrode holding circuit is through switch S 25, inductance L 21, switch S 24, and diode D22 keeps electrode with the AC-PDP display screen and is connected to capacitor C 21, and the AC-PDP display screen gives capacitor C 21 chargings.Y electrode holding circuit connects AC-PDP display screen scan electrode to power supply Vs through switch S 11, AC-PDP display screen scan electrode sustaining voltage Vs.t
7-t
8Each switch conduction state is: S22, S25, S11 closure, other switches disconnect.At this moment, X electrode holding circuit is kept electrode through switch S 25, switch S 22 with the AC-PDP display screen and is connected to ground, and the AC-PDP display screen is kept electrode and kept no-voltage.Y electrode holding circuit connects AC-PDP display screen scan electrode to power supply Vs by switch S 11, AC-PDP display screen scan electrode sustaining voltage Vs.t
8-t
9Each switch conduction state is: S22, S11 closure, other switches disconnect.At this moment, X electrode holding circuit disconnects the connection that the AC-PDP display screen is kept electrode, and the AC-PDP display screen is kept electrode and kept high-impedance state.Y electrode holding circuit connects AC-PDP display screen scan electrode to power supply Vs through switch S 11, AC-PDP display screen scan electrode sustaining voltage Vs.t
9-t
10Each switch conduction state is: S22, S14 closure, other switches disconnect.At this moment, X electrode holding circuit disconnects the connection that the AC-PDP display screen is kept electrode, and the AC-PDP display screen is kept electrode and kept high resistant.Y electrode holding circuit connects AC-PDP display screen scan electrode to capacitor C 11 through inductance L 11, switch S 14, diode D12, and the AC-PDP display screen gives capacitor C 11 chargings.t
10-t
11Each switch conduction state is: S22, S12 closure, other switches disconnect.At this moment, X electrode holding circuit disconnects the connection that the AC-PDP display screen is kept electrode, and the AC-PDP display screen is kept electrode and kept high-impedance state.Y electrode holding circuit connects AC-PDP display screen scan electrode to ground through switch S 12, and AC-PDP display screen scan electrode keeps no-voltage.So just having finished one keeps the cycle.
Figure 10 is four of embodiments of the invention.
Keep (102) two parts of X electrode holding circuit that the drive waveforms generating means comprises the Y electrode holding circuit (101) that is used for scan electrode and is used to keep electrode.Y electrode holding circuit is by switch S 11, S12, S13, S14, inductance L 11, and capacitor C 11, diode D11, D12, D101 constitute.X electrode holding circuit is by switch S 21, S22, S23, S24, inductance L 21, and capacitor C 21, diode D21, D22, D201 constitute.In Y electrode holding circuit 101, capacitor C 11 1 ends are connected to ground, and the other end is by parallel circuit 103, and inductance L 11 is connected to AC-PDP display screen scan electrode.Diode D11 connects with switch S 13, and diode D12 connects with switch S 14, the two formation parallel circuit 103 in parallel again.Diode D101 positive pole is connected to power supply Vs, and the other end is connected to AC-PDP display screen scan electrode by switch S 11, and switch S 12 1 ends are connected to ground, and the other end is connected to AC-PDP display screen scan electrode.In X electrode holding circuit 102, capacitor C 21 1 ends are connected to ground, and the other end is by parallel circuit 104, and inductance L 21 is connected to AC-PDP display screen scan electrode.Diode D21 connects with switch S 23, and diode D22 connects with switch S 24, the two formation parallel circuit 104 in parallel again.Diode D201 positive pole is connected to power supply Vs, and the other end is connected to AC-PDP display screen scan electrode by switch S 21, and switch S 22 1 ends are connected to ground, and the other end is connected to the AC-PDP display screen and keeps electrode.
Figure 11 is four a switch conduction sequential chart of the embodiment of the invention.From t
1To t
11Being one keeps the cycle.There is shown embodiment four in each switch conducting sequential chart and corresponding scan electrode and keep electrode and keep waveform.t
1-t
2Each switch conduction state is: S14, S21 closure, other switches disconnect.At this moment, Y electrode holding circuit is through inductance L 11, switch S 14, and diode D12 is connected to capacitor C 11 with AC-PDP display screen scan electrode, and the AC-PDP display screen gives capacitor C 11 chargings.X electrode holding circuit is kept electrode through switch S 21 with the AC-PDP display screen and is connected to power supply Vs, and the AC-PDP display screen is kept electrode sustaining voltage Vs.t
2-t
4Each switch conduction state is: S12, S21 closure, other switches disconnect.At this moment, Y electrode holding circuit is connected to ground through switch S 12 with AC-PDP display screen scan electrode, and AC-PDP display screen scan electrode keeps no-voltage.X electrode holding circuit is kept electrode through diode D201, switch S 21 with the AC-PDP display screen and is connected to power supply Vs, and the AC-PDP display screen is kept electrode sustaining voltage Vs.t
4-t
5Each switch conduction state is: S13, S21 closure, other switches disconnect.At this moment, Y electrode holding circuit is connected to capacitor C 11 through diode D11, inductance L 11, switch S 13 with AC-PDP display screen scan electrode, and capacitor C 11 is given the charging of AC-PDP display screen.X electrode holding circuit is kept being connected of electrode because the effect of diode D201 disconnects with the AC-PDP display screen, and AC-PDP display screen X electrode keeps high-impedance state.t
5-t
6Each switch conduction state is: S11, S21 closure, other switches disconnect.At this moment, Y electrode holding circuit is through diode D101, and switch S 11 is connected to power supply Vs with AC-PDP display screen scan electrode, AC-PDP display screen scan electrode sustaining voltage Vs.X electrode holding circuit is kept being connected of electrode because the effect of diode D201 disconnects with the AC-PDP display screen, and the AC-PDP display screen is kept electrode and kept high-impedance state.t
6-t
7Each switch conduction state is: S11, S24 closure, other switches disconnect.At this moment, Y electrode holding circuit is connected to power supply Vs through diode D101, switch S 11 with AC-PDP display screen scan electrode, AC-PDP display screen scan electrode sustaining voltage Vs.X electrode holding circuit connects the AC-PDP display screen through switch S 24, inductance L 21, diode D22 and keeps electrode to capacitor C 21, and the AC-PDP display screen gives capacitor C 21 chargings.t
7-t
9Each switch conduction state is: S11, S22 closure, other switches disconnect.At this moment, Y electrode holding circuit is connected to power supply Vs through switch S 11 with AC-PDP display screen scan electrode, AC-PDP display screen scan electrode sustaining voltage Vs.X electrode holding circuit connects the AC-PDP display screen through switch S 22 and keeps electrode to ground, and the AC-PDP display screen is kept electrode and kept no-voltage.t
9-t
10Each switch conduction state is: S11, S23 closure, other switches disconnect.At this moment, Y electrode holding circuit disconnects the connection of AC-PDP display screen scan electrode because of diode D101, and AC-PDP display screen scan electrode keeps high resistant.X electrode holding circuit connects the AC-PDP display screen through switch S 23, inductance L 21, diode D21 and keeps electrode to capacitor C 21, and capacitor C 21 is given the charging of AC-PDP display screen.t
10-t
11Each switch conduction state is: S11, S21 closure, other switches disconnect.At this moment, Y electrode holding circuit diode disconnects the connection of AC-PDP display screen scan electrode because of D101, and AC-PDP display screen scan electrode keeps high-impedance state.X electrode holding circuit connects the AC-PDP display screen through switch S 21 and keeps electrode to power supply Vs, and the AC-PDP display screen is kept electrode sustaining voltage Vs.So just having finished one keeps the cycle.
Figure 12 is five of embodiments of the invention.
Keep (102) two parts of X electrode holding circuit that the drive waveforms generating means comprises the Y electrode holding circuit (101) that is used for scan electrode and is used to keep electrode.Y electrode holding circuit is by switch S 11, S12, S13, S14, inductance L 11, and capacitor C 11, diode D11, D12, D111 constitute.X electrode holding circuit is by switch S 21, S22, S23, S24, inductance L 21, and capacitor C 21, diode D21, D22, D211 constitute.In Y electrode holding circuit 101, capacitor C 11 1 ends are connected to ground, and the other end is by parallel circuit 103, and inductance L 11 is connected to AC-PDP screen scan electrode.Diode D11 connects with switch S 13, and diode D12 connects with switch S 14, the two formation parallel circuit 103 in parallel again.Power supply Vs is connected to AC-PDP display screen scan electrode by switch S 11, and diode D111 negative pole end is connected to ground, and positive terminal is connected to AC-PDP display screen scan electrode by switch S 12.In X electrode holding circuit 102, capacitor C 21 1 ends are connected to ground, and the other end is by parallel circuit 104, and inductance L 21 is connected to the AC-PDP display screen and keeps electrode.Diode D21 connects with switch S 23, and diode D22 connects with switch S 24, the two formation parallel circuit 104 in parallel again.Power supply Vs is connected to the AC-PDP display screen by switch S 21 and keeps electrode, and diode D211 negative pole end is connected to ground, and positive terminal is connected to the AC-PDP display screen by switch S 22 and keeps electrode.
Figure 13 is five a switch conduction sequential chart of the embodiment of the invention.From t
1To t
11Being one keeps the cycle.There is shown embodiment five in each switch conducting sequential chart and corresponding scan electrode and keep electrode and keep waveform.t
1-t
2Each switch conduction state is: S13, S22 closure, other switches disconnect.At this moment, Y electrode holding circuit connects AC-PDP display screen scan electrode to capacitor C 11 through diode D11, switch S 13, inductance L 11, and capacitor C 11 is given the charging of AC-PDP display screen.X electrode holding circuit is through switch S 22, and diode D211 keeps electrode with the AC-PDP display screen and is connected to ground, and the AC-PDP display screen is kept electrode and kept no-voltage.t
2-t
4Each switch conduction state is: S11, S22 closure, other switches disconnect.At this moment, Y electrode holding circuit is connected to power supply Vs through switch S 11 with AC-PDP display screen scan electrode, AC-PDP display screen scan electrode sustaining voltage Vs.X electrode holding circuit is kept electrode through diode D211, switch S 22 with the AC-PDP display screen and is connected to ground, and the AC-PDP display screen is kept electrode and kept no-voltage.t
4-t
5Each switch conduction state is: S14, S22 closure, other switches disconnect.At this moment, Y electrode holding circuit is connected to capacitor C 11 through inductance L 11, switch S 14, diode D12 with AC-PDP display screen scan electrode, and the AC-PDP display screen gives capacitor C 11 chargings.The X electrode drive circuit is kept being connected of electrode because the effect of diode D211 disconnects with the AC-PDP display screen, and the AC-PDP display screen is kept electrode and kept high-impedance state.t
5-t
6Each switch conduction state is: S12, S22 closure, other switches disconnect.At this moment, Y electrode holding circuit is connected to ground through diode D111, switch S 12 with AC-PDP display screen scan electrode, and AC-PDP display screen scan electrode keeps no-voltage.X electrode holding circuit is kept being connected of electrode because the effect of diode D211 disconnects with the AC-PDP display screen, and the AC-PDP display screen is kept electrode and kept high-impedance state.t
6-t
7Each switch conduction state is: S12, S23 closure, other switches disconnect.At this moment, Y electrode holding circuit is connected to ground through diode D111, switch S 12 with AC-PDP display screen scan electrode, and AC-PDP display screen scan electrode keeps no-voltage.X electrode holding circuit connects the AC-PDP display screen through inductance L 11, switch S 23, diode D21 and keeps electrode to capacitor C 21, and capacitor C 21 is given the charging of AC-PDP display screen.t
7-t
9Each switch conduction state is: S12, S21 closure, other switches disconnect.At this moment, Y electrode holding circuit is connected to ground through switch S 12 with AC-PDP display screen scan electrode, and AC-PDP display screen scan electrode keeps no-voltage.X electrode holding circuit connects the AC-PDP display screen through switch S 21 and keeps electrode to power supply Vs, and the AC-PDP display screen is kept electrode sustaining voltage Vs.t
9-t
10Each switch conduction state is: S12, S24 closure, other switches disconnect.At this moment, Y electrode holding circuit is because the effect of diode D111 disconnects the connection of AC-PDP display screen scan electrode, and AC-PDP display screen scan electrode keeps high-impedance state.X electrode holding circuit connects the AC-PDP display screen through inductance L 21, switch S 24, diode D22 and keeps electrode to capacitor C 21, and the AC-PDP display screen gives capacitor C 21 chargings.t
10-t
11Each switch conduction state is: S12, S22 closure, other switches disconnect.At this moment, Y electrode holding circuit is because the effect of diode D111 disconnects the connection of AC-PDP display screen scan electrode, and AC-PDP display screen scan electrode keeps high resistant.X electrode holding circuit connects the AC-PDP display screen through switch S 22 and keeps electrode to ground, and the AC-PDP display screen is kept electrode and kept no-voltage.So just having finished one keeps the cycle.
In sum, the present invention also has the following advantages:
1) high resistant that adopts the present invention to propose is kept driving method, can significantly prevent in the sustain discharge process The loss of wall electric charge.
2) high resistant that adopts the present invention to propose is kept driving method, can significantly improve and keep the voltage headroom degree.
3) high resistant that adopts the present invention to propose is kept driving method, can significantly improve the stable of sustain discharge The property.
Claims (5)
1. an AC plasma display screen keeps driving method, it is characterized in that: during keeping, at scan electrode with keep electrode and alternately apply the positive pulse sequence, when scan electrode with keep voltage difference between the electrode when keeping voltage Vs and descend, disconnect scan electrode or keep being electrically connected of electrode and make it keep high-impedance state.
2. AC plasma display screen maintaining drive method according to claim 1, it is characterized in that: keep for one and comprise the positive pulse that alternately appears on the scan electrode in the cycle and keep a positive pulse on the electrode, when keeping pulse when keeping voltage Vs and reduce to zero on the scan electrode, being electrically connected of electrode kept in disconnection, keeps high-impedance state; On keeping electrode, keep pulse when keeping voltage Vs and reduce to zero, disconnect the connection of scan electrode, keep high-impedance state.
3. AC plasma display screen maintaining drive method according to claim 1, it is characterized in that: keep for one and comprise the positive pulse that alternately appears on the scan electrode in the cycle and keep a positive pulse on the electrode, the pulse of keeping on keeping electrode reduces to zero or be upgraded to when keeping voltage Vs by above freezing by keeping voltage Vs, disconnect being electrically connected of scan electrode, keep high-impedance state.
4. AC plasma display screen maintaining drive method according to claim 1, it is characterized in that: keep for one and comprise the positive pulse that alternately appears on the scan electrode in the cycle and keep a positive pulse on the electrode, when the pulse of keeping on the scan electrode reduces to zero or be upgraded to when keeping voltage Vs by above freezing by keeping voltage Vs, being electrically connected of electrode kept in disconnection, keeps high-impedance state.
5. AC plasma display screen maintaining drive method according to claim 1, it is characterized in that: keep for one and comprise the positive pulse that alternately appears on the scan electrode in the cycle and keep a positive pulse on the electrode, when the pulse of keeping on the scan electrode is upgraded to when keeping voltage Vs by above freezing, being electrically connected of electrode kept in disconnection, keeps high-impedance state; The pulse of keeping on keeping electrode is upgraded to when keeping voltage Vs by above freezing, disconnects being electrically connected of scan electrode, keeps high-impedance state.
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| CN100370499C true CN100370499C (en) | 2008-02-20 |
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| CN102760401B (en) * | 2012-07-18 | 2016-04-27 | 西安交通大学 | Alternating-current plasma display adaptive voltage maintenance method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001125537A (en) * | 1999-10-29 | 2001-05-11 | Matsushita Electric Ind Co Ltd | Panel display device and driving method for gas discharge panel |
| CN1339771A (en) * | 2000-08-24 | 2002-03-13 | 松下电器产业株式会社 | Plasma display flat panel display device and its driving method |
| CN1381863A (en) * | 2002-06-11 | 2002-11-27 | 西安交通大学 | Surface discharge type plasma display screen with dual discharge spaces |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001125537A (en) * | 1999-10-29 | 2001-05-11 | Matsushita Electric Ind Co Ltd | Panel display device and driving method for gas discharge panel |
| CN1339771A (en) * | 2000-08-24 | 2002-03-13 | 松下电器产业株式会社 | Plasma display flat panel display device and its driving method |
| CN1381863A (en) * | 2002-06-11 | 2002-11-27 | 西安交通大学 | Surface discharge type plasma display screen with dual discharge spaces |
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