JP2005037787A - Driving method of ac type plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving method of an AC type plasma display panel for suppressing reduction of a wall voltage between faces due to movement of space charge after write discharge, and for driving even with a low maintenance pulse voltage. <P>SOLUTION: One field is composed of multiple subfields, and one subfield 5 is composed of an initiation period 2, a scanning period 3 and a maintenance period 4. In the scanning period 3, a finishing timing 7b of a data pulse 7 is set earlier than a finishing timing 6b of a scanning pulse 6 corresponding to the data pulse 7 by a time t1. The time t1 is set more than 0.2 μsec. Thus, the reduction of the wall voltage formed in a discharge cell by write discharge is suppressed, caused by finishing of the scanning pulse. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for driving a three-electrode AC type plasma display panel.

  Generally, a plasma display panel (hereinafter also referred to as PDP) has many features such as being thin and capable of relatively large screen display, wide viewing angle, and high response speed. Yes. For this reason, it has recently been used as a flat display for wall-mounted televisions, public display boards, and the like. The PDP has a DC discharge type (DC type) PDP that operates by exposing the electrodes to a discharge space filled with a discharge gas and generating a DC discharge between the electrodes, and an electrode as a dielectric layer. Therefore, it is classified into an AC discharge type (AC type) PDP that is not directly exposed to the discharge gas but is operated in an AC discharge state. In the DC type PDP, the discharge continues during the period in which the voltage is applied, and in the AC type PDP, the discharge is sustained by reversing the polarity of the voltage. In addition, there are AC type PDPs having 2 electrodes and 3 electrodes in one cell.

  Hereinafter, the structure and driving method of a conventional three-electrode AC plasma display panel will be described. FIG. 7 is a cross-sectional view showing the structure of the cell in the plasma display panel, and FIG. 8 is a plan view showing the electrode arrangement of the plasma display. As shown in FIG. 7, in this conventional three-electrode AC type plasma display panel, a front substrate 20 and a rear substrate 21 facing the front substrate 20 are provided. The front substrate 20 and the back substrate 21 are made of glass, for example. A plurality of scan electrodes 22 and sustain electrodes 23 are alternately arranged on the surface of the front substrate 20 facing the back substrate 21 with a predetermined interval. The scan electrode 22 and the sustain electrode 23 are transparent electrodes made of ITO or the like, and extend in the direction from the back side to the near side in FIG. Further, a metal trace electrode 32 is laminated on the scan electrode 22 and the sustain electrode 23 in order to reduce the wiring resistance. Further, a transparent dielectric layer 24 is provided so as to cover the scan electrode 22 and the sustain electrode 23, and a protective layer 25 made of MgO or the like is formed on the transparent dielectric layer 24.

  On the other hand, a plurality of data electrodes 29 are provided on the surface of the rear substrate 21 facing the front substrate 20, and the data electrodes 29 extend in a direction perpendicular to the scan electrodes 22 and the sustain electrodes 23. A white dielectric layer 28 and a phosphor layer 27 are provided on the data electrode 29.

  A partition wall 33 is provided between the front substrate 20 and the rear substrate 21. The barrier ribs 33 are formed in a grid pattern (lattice shape) when viewed from a direction perpendicular to the surface of the substrate, and secure a space between the front substrate 20 and the rear substrate 21 as a discharge space 26 and a discharge space. 26 is partitioned as a display cell 31 (see FIG. 8). Each display cell includes one closest portion between the scan electrode 22 and the data electrode 29 and one closest portion between the sustain electrode 23 and the data electrode 29. Note that a distance between the scan electrode 22 and the sustain electrode 23 in the display cell is a surface discharge gap 34. A mixed gas such as He, Ne, and Xe is sealed in the discharge space 26 as a discharge gas.

  Further, as shown in FIG. 8, on the display display screen 30 of the PDP, m scanning electrodes 22 (each scanning electrode is represented by a symbol Si (i = 1 to m)) and m sustaining electrodes 23 (each Sustain electrodes are represented by reference signs Ci (i = 1 to m) and n data electrodes 29 (respective data electrodes are represented by reference signs Dj (j = 1 to n)) so as to include the closest portions. The display cells 31 are arranged in a matrix. Note that m and n are natural numbers. Between the scan electrode Si and the sustain electrode Ci is a surface discharge gap 34 where surface discharge occurs, and between the scan electrode Si and the sustain electrode Ci-1 is a non-discharge gap 35 where no surface discharge occurs. Yes.

  Next, a method for driving this conventional PDP will be described. Conventionally, the mainstream method for driving a PDP is a scan sustaining separation method (ADS method) in which a scanning period and a sustaining period are separated. Hereinafter, a driving method of this scanning maintenance separation method will be described. FIG. 9 is a waveform diagram showing a driving method of a conventional three-electrode AC type plasma display panel. FIGS. 10A to 10D are schematic cross-sectional views showing this conventional PDP driving method, and are diagrams showing the distribution of wall charges on each electrode. 10A to 10D, the scanning electrode S, the sustaining electrode C, and the data electrode D are shown by thick lines, and the polygon drawn on the upper side of these electrodes (thick lines) is a regular wall. The polygon shown on the lower side of the figure indicates the charge 10, the negative wall charge 11, and the distance (height) from each polygonal electrode indicates the magnitude of the charge. Further, FIG. 11 is a waveform diagram showing the temporal relationship between the scan pulse and the data pulse in this conventional PDP driving method.

  As shown in FIG. 9, in a conventional PDP driving method, one field includes a plurality of subfields (hereinafter also referred to as SF), and one subfield 5 includes an initialization period 2, a scanning period 3, and a sustain period. It is composed of four periods. The initialization period 2 includes a sustain erase period 2a, a priming period 2b, and a priming erase period 2c.

  First, the initialization period 2 will be described. In sustain period 1 of the subfield immediately preceding subfield 5, positive potential Vs is applied to scan electrode S of each cell, and ground potential (GND) is applied to sustain electrode C and data electrode D. Yes. The state of the wall charge in the cell at the first time of the initialization period 2 differs depending on whether or not the cell is lit in the maintenance period 1 of the previous SF. Therefore, if the next write discharge is performed immediately after the end of the sustain period 1 of the previous SF, the state of the wall charge in each cell is not uniform, so the write discharge is generated in the cell where the write discharge is to be generated. Or a false discharge occurs in a cell that does not cause a write discharge.

  When discharge occurs in the cell, the electric field in the cell becomes uniform. Accordingly, in a cell that is lit in the sustain period 1 of the previous SF, that is, in a cell in which a sustain discharge has occurred, the electric field in the cell becomes uniform due to the occurrence of the discharge, so FIG. As shown in FIG. 2, negative wall charges 11 are formed in a region corresponding to the scan electrode S on the surface of the transparent dielectric layer 24 (hereinafter referred to as scan electrode S), and maintained on the surface of the transparent dielectric layer 24. A positive wall charge 10 is formed in a region corresponding to the electrode C (hereinafter referred to as the sustain electrode C), and a region corresponding to the data electrode D on the surface of the white dielectric layer 28 (hereinafter referred to as the data electrode D). ) Also forms a positive wall charge 10.

  On the other hand, in the cell in which no sustain discharge is generated in sustain period 1 of the previous SF, negative wall charges 11 are formed on scan electrode S as shown in FIG. 10A, and scan electrode on sustain electrode C is formed. A positive wall charge 10 is formed in a region far from S, a negative wall charge 11 is formed in a region near the scan electrode S on the sustain electrode C, and a positive wall charge 10 is formed on the data electrode D. In the region near the sustain electrode C on the scan electrode S, the positive wall charge continuously decreases as the sustain electrode C is approached. In the region near the scan electrode S on the sustain electrode C, The wall charge continuously decreases from positive to negative. For this reason, the wall potential in the region near the sustain electrode C on the scan electrode S and the wall potential in the region near the scan electrode S in the sustain electrode C are substantially equal to each other.

  One role of the initialization period 2 is to initialize wall charge states in different cells depending on the lighting state in the sustain period 1 of the previous subfield. Further, another role of the initialization period 2 is to obtain a priming effect that makes it easy to generate a write discharge in the scanning period 3.

  In the initialization period 2, the potential of the data electrode is always the ground potential. In the sustain / erase period 2a of the initialization period 2, the potential of the scan electrode S is continuously lowered from the positive potential Vs to the ground potential. Further, the potential of the sustain electrode C is constant at the positive potential Vs. The positive potential Vs is about 170V, for example. As a result, the sustain electrode C becomes positive and the scan electrode S becomes negative. For this reason, in the cell in which the sustain discharge is generated in the sustain period 1 of the previous SF and the wall charge is formed, the wall voltage due to the wall charge is superimposed on the potential difference between the sustain electrode C and the scan electrode S. Discharge occurs between S and the sustaining electrode C (hereinafter also referred to as “between surfaces”). However, since the potential difference between the scan electrode S and the sustain electrode C gradually increases, suddenly strong discharge does not occur and weak discharge (weak discharge) is continuously generated. The weak discharge refers to a weak discharge that is sustained while maintaining the voltage between the discharge gaps substantially at the discharge start voltage. As a result, as shown in FIG. 10A, the wall charges in the vicinity of the surface discharge gap among the wall charges formed on the scan electrodes S and the sustain electrodes C can be reduced.

  On the other hand, in a cell in which no sustain discharge is generated in the sustain period 1 of the previous SF, since the total amount of wall charges formed in the cell is small, weak discharge between the surfaces does not occur. For this reason, the wall charge state remains as shown in FIG.

  As described above, in the sustain erasing period 2a, the weak discharge is generated only in the cells in which the sustain discharge is generated in the sustain period 1 of the previous SF, so that the sustain discharge is generated in the sustain period 1 of the previous SF. It can be in the same state as the wall charge arrangement of the cells that are not. That is, at the end of the sustain erasing period 2a, the wall charge arrangement is as shown in FIG. 10A regardless of the lighting / non-lighting state of the sustain period 1 of the previous SF. In other words, the cell wall charge arrangement can be initialized.

  In the priming period 2b, a priming discharge is generated in order to cause a writing discharge in a later process at a low voltage, thereby obtaining a priming effect. The priming discharge is generated every time in each SF regardless of the lighting / non-lighting state in the sustain period 1 of the previous SF. For this reason, the priming discharge needs to be a weak discharge so that the luminance in black display, that is, the black luminance does not increase. As shown in FIG. 9, in the priming period 2b, the potential of the scan electrode S is increased to the potential Vs, and then continuously increased from the potential Vs to the potential Vp higher than the potential Vs. That is, a positive ramp waveform voltage is applied to the scan electrode S. On the other hand, the potential of the sustain electrode C is set to the ground potential. As a result, scan electrode S has a positive polarity, sustain electrode C has a negative polarity, and a potential difference equal to or greater than the surface discharge start voltage is applied between scan electrode S and sustain electrode C (between surfaces). Weak discharge occurs. This weak discharge is called priming discharge. By the priming discharge, the discharge gas in the cell is ionized, and positive ions and electrons are supplied into the cell. As a result, discharge is likely to occur in a scanning period 3 and a sustain period 4 described later. As a result of the occurrence of the priming discharge, the wall charge arrangement in the cell is such that a negative wall charge is formed on the scan electrode S, a positive wall charge is formed on the sustain electrode C, and a positive wall charge is formed on the data electrode D. In the vicinity of the discharge gap on the scan electrode S and the sustain electrode C, wall charges larger than those in other regions are formed.

  In the priming erasing period 2c, the potential of the scan electrode S is discontinuously decreased to the potential Vs and then continuously decreased from the potential Vs to the ground potential. On the other hand, the potential of the sustain electrode C is set to the potential Vs. Thereby, contrary to the priming period 2b described above, the scan electrode S becomes negative and the sustain electrode C becomes positive. Therefore, a weak discharge opposite to the above-described priming discharge, that is, a priming erasing discharge occurs between the surfaces, and the wall charges formed by the priming discharge can be erased. In order not to increase the black luminance, the priming erasing discharge needs to be a weak discharge like the priming discharge. As a result of the occurrence of the priming erasing discharge, the wall charge arrangement in the cell is in a state as shown in FIG. That is, this wall charge arrangement is the same as the wall charge arrangement before priming discharge. As a result, the initialization period 2 ends. At this time, the potential due to the wall charges formed between the scan electrode S and the data electrode D is substantially the potential Vs, and in the vicinity of the surface discharge gap, the potential on the scan electrode S and the potential on the sustain electrode C are Are approximately equal.

  In the scanning period 3, a write discharge which is a counter discharge is selectively generated only for the cells in which a sustain discharge is to be generated in the subsequent sustain period 4 to form wall charges that are likely to generate a sustain discharge. Note that when generating the write discharge as the counter discharge, it is necessary to cause the positive ions generated by the discharge to collide with the protective layer 25 made of MgO to emit secondary electrons. It is necessary to have negative polarity with respect to D. In general, in a PDP, all drive waveforms are positive in order to reduce circuit cost. Therefore, the negative scan pulse 6 is realized by dropping the potential of the scan electrode S to the ground potential in the form of a pulse with the potential Vbw as a reference.

  That is, in the scanning period 3, the positive potential Vbw is applied to the scanning electrode S, and the positive potential Vs is applied to the sustain electrode C. The potential Vbw is, for example, about 80 to 110 V, and the potential Vs is, for example, about 170 V as described above. In this state, the negative scan pulse 6 is sequentially applied to the scan electrodes S1 to Sm. In accordance with the timing of the scan pulse 6, the data pulse 7 is selectively applied to the data electrodes D1 to Dn based on the display data. The voltage Vd of the data pulse 7 is about 70V, for example. 9 indicates that the data pulse 7 is applied or not depending on the display data.

  As shown in FIG. 11, the start timing of the scan pulse 6 coincides with the start timing of the data pulse 7, and the end timing of the scan pulse 6 coincides with the end timing of the data pulse 7. . In addition, the scan pulse 6 and the scan pulse 6 generated next are separated in time, and the potential of the scan electrode S is the potential Vbw between the scan pulses 6. At this time, the data pulse 7 is not applied to the data electrode D, and the potential of the data electrode D is the ground potential regardless of the video signal.

  In the cell to which the data pulse 7 is applied, the voltage Vd is applied between the scanning electrode S and the data electrode D (hereinafter referred to as “opposite”). As described above, since a wall voltage having a magnitude of approximately Vs is formed between the opposing surfaces, the wall voltage Vs is superimposed on the voltage Vd applied between the opposing surfaces, and a high voltage is applied between the opposing surfaces. The As a result, the potential difference between the counters becomes equal to or higher than the counter discharge start voltage, and write discharge occurs between the counters. Further, since the positive potential Vs is applied to the sustain electrode C, the potential difference between the scan electrode S and the sustain electrode C is Vs. When there is such a potential difference, a surface discharge is induced between the scan electrode S and the sustain electrode C (between surfaces) along with the write discharge, and a charge transfer occurs. As a result, in the cell in which the write discharge has occurred, positive wall charges are formed on the scan electrodes S and negative wall charges are formed on the sustain electrodes C as shown in FIG. The The data electrode D has a positive polarity with respect to the scan electrode S, but has a negative polarity with respect to the sustain electrode C, so that almost no wall charge is formed on the data electrode D.

  On the other hand, in the cell to which the data pulse 7 is not applied, the voltage between the scan electrode S and the data electrode D is 0 V, so that the wall voltage Vs between the scan electrode S and the data electrode D is superimposed on this. However, the voltage between the counters does not exceed the discharge start voltage, and no write discharge occurs. For this reason, the state of the wall charge does not change and remains in the state shown in FIG. Thus, two types of wall charge situations can be created for each cell depending on the presence or absence of the data pulse 7.

  When the scan pulse 6 is applied to all the scan electrodes S1 to Sm, the sustain period 4 is started. In sustain period 4, positive sustain pulses 8 are alternately applied to all scan electrodes S and all sustain electrodes C. The voltage value of sustain pulse 8 is Vs. First, sustain pulse 8 (referred to as a first sustain pulse) is applied to scan electrode S, and a ground potential is applied to sustain electrode C. In the sustain period 5, the potential of the data electrode D always remains at the ground potential. At this time, in the cell in which the write discharge is generated in the scanning period 3, a large positive wall charge is formed on the scan electrode S and a large negative wall charge is formed on the sustain electrode C. The wall voltage due to this positive wall charge is superimposed on the first sustain pulse applied to the surface voltage, the inter-surface voltage becomes equal to or greater than the surface discharge start voltage, and a sustain discharge that is a surface discharge is generated. As a result of this sustain discharge, negative wall charges are formed on the scan electrodes S and positive wall charges are formed on the sustain electrodes C as shown in FIG. On the other hand, in the cells in which no write discharge has occurred in the scanning period 3, no wall voltage is superimposed on the first sustain pulse, and the voltage between the surfaces does not reach the surface discharge start voltage, so no sustain discharge occurs.

  The next sustain pulse (referred to as a second sustain pulse) is applied to sustain electrode C. At the same time, a ground potential is applied to the scan electrode S. At this time, in the cell in which the sustain discharge is generated by the first sustain pulse, the second sustain pulse is superimposed on the wall charges formed by the sustain discharge by the first sustain pulse, and the sustain discharge is generated. As a result, wall charges having a polarity opposite to that when the sustain discharge is generated by the first sustain pulse are formed on the scan electrode S and the sustain electrode C. That is, the arrangement of the wall charges returns to the state shown in FIG. Subsequent discharges are continuously generated on the same principle. That is, by alternately applying sustain pulse 8 to scan electrode S and sustain electrode C, the potential difference due to the wall charges generated by the xth sustain discharge is superimposed on the (x + 1) th sustain pulse, and the sustain discharge continues. . The amount of light emission is determined by the number of sustain discharges. On the other hand, in the pixel in which no writing discharge has occurred, wall charges are not superimposed on the sustain pulse. Since only the sustain pulse does not reach the discharge start voltage, no surface discharge occurs.

  When displaying an image on a PDP, within one field, which is a period for displaying image information on one screen, whether the number of sustain pulses in each subfield is different from each other, and whether each subfield is lit or not lit By selecting and controlling the number of sustain discharges, gradation display of an image can be performed.

  Next, another conventional PDP driving method will be described. FIG. 12 is a waveform diagram showing a temporal relationship between a scan pulse and a data pulse in another conventional PDP driving method. In the conventional example shown in FIG. 11, the data electrode potential is pulled down to the ground potential every time the data pulse 7 ends, and the displacement current flows to the data electrode D each time, so that the power consumption of the data driver increases. . On the other hand, in the conventional example shown in FIG. 12, the end timing of the data pulse 7 and the start timing of the next data pulse 7 are matched. Thereby, when the data pulse 7 is continuously applied, the potential of the data electrode D can be kept constant at the potential Vd. Therefore, the power consumption of the data driver can be reduced by the amount of displacement current as compared with the conventional example shown in FIG.

  Japanese Patent Laid-Open No. 8-305319 (Patent Document 1) discloses a technique in which a data electrode is divided into two blocks and the timing of data pulses is shifted between the blocks. Thereby, the pulse current can be dispersed in time, and the voltage drop in the driving circuit of the PDP can be suppressed.

JP-A-8-305319

  However, the conventional techniques as described above have the following problems. FIGS. 13A to 13C are schematic cross-sectional views showing the charge distribution in the cell after the write discharge is generated in time order in the conventional PDP driving method. In the driving method of the AC type plasma display panel as described above, a large amount of space charge is generated in the cell discharge space by the write discharge. This space charge is attracted by the electric field, adheres to the surface of the dielectric layer on the electrode, becomes a wall charge, and generates a wall voltage. Thus, as shown in FIGS. 10B and 13A, at the end of the scan pulse, the ground potential is applied to the scan electrode S, the positive wall charge 10 is formed on the scan electrode S, and the sustain electrode is formed. The potential Vs is applied to C, the negative wall charge 11 is formed on the sustain electrode C, the potential Vd is applied to the data electrode D, and almost no wall charge is formed on the data electrode D.

  However, as shown in FIG. 13A, not all the space charges become wall charges due to the write discharge, and the space charge 12 exists in the cell even after the write discharge is completed. For this reason, when the potential of the scan electrode S is raised from the ground potential to the potential Vbw with the end of the scan pulse 6, the potential difference between the scan electrode S and the sustain electrode C becomes small. As a result, as shown in FIG. 13B, a new electric field is generated, and space charges having the opposite polarity to the wall charges accumulated on the respective electrodes are attracted to each electrode. That is, negative space charges are attracted onto the scan electrode S, and positive space charges are primarily attracted onto the sustain electrode C. As a result, as shown in FIGS. 10C and 13C, the wall voltage between the scan electrode S and the sustain electrode D decreases.

  Thus, even if a sufficient wall voltage is once formed between the scan electrode S and the sustain electrode C by the write discharge, the wall voltage decreases with the end of the scan pulse 6. For this reason, unless the voltage Vs of sustain pulse 6 is set high in sustain period 4, sustain discharge does not occur normally. In order to set the sustain pulse voltage Vs high, it is necessary to increase the breakdown voltage of the sustain driver, which increases the cost of the PDP. In the conventional driving method described above, the minimum sustain voltage Vdsmin that can be normally operated is about 152V.

  Further, the conventional PDP driving method shown in FIG. 12 and the conventional PDP driving method disclosed in Patent Document 1 also reduce the wall voltage between the surfaces due to the movement of the space charge after the above-described write discharge. Cannot solve the problem.

  The present invention has been made in view of such problems, and suppresses a decrease in wall voltage between planes due to movement of space charge after write discharge, and can be driven even with a low sustain pulse voltage. An object of the present invention is to provide a panel driving method.

  The driving method of the AC type plasma display panel according to the present invention includes a first insulating substrate and a second insulating substrate arranged opposite to each other, and alternately facing the surface of the first insulating substrate facing the second insulating substrate. A plurality of scan electrodes and sustain electrodes provided in the first direction, a first dielectric layer covering the scan electrodes and the sustain electrodes, and a side of the second insulating substrate facing the first insulating substrate A plurality of data electrodes extending in a second direction orthogonal to the first direction, and a second dielectric layer covering the data electrodes, the data electrode being closest to the scan electrode, An AC type plasma display panel in which a display based on display data is performed on an AC type plasma display panel in which pixels are formed in a matrix so as to include one nearest point of contact with the sustain electrode. In the moving method, one field for displaying one image is composed of one or a plurality of subfields, and this subfield sequentially scans the scan electrodes with an initialization period for initializing the charge state in each pixel. A scanning period in which a pulse is applied and a data pulse is applied to the data electrode based on the display data in synchronization with the scanning pulse to selectively form wall charges in the pixel, and the scanning electrode and the sustaining In a pixel in which the wall charges are formed by alternately applying a voltage to the electrodes, a scan electrode region corresponding to the scan electrode and a sustain electrode region corresponding to the sustain electrode on the surface of the first dielectric layer A sustain period in which a sustain discharge is generated, and the data pulse synchronized with the scan pulse ends before the end of each scan pulse. .

  In the present invention, when the data pulse synchronized with the scan pulse is completed before each scan pulse is completed, the space charge in the discharge cell is attracted to the sustain electrode and the data electrode to become wall charge, and the space charge is reduced. Decrease. When the scan pulse ends in this state, the space charge that moves with the end of the scan pulse is small, so that it is possible to suppress cancellation of wall charges between the surfaces once formed.

  Further, it is preferable that the data pulse synchronized with the scan pulse is completed 0.2 μsec or more before the end of each scan pulse. Thereby, the space charge in the discharge cell after the end of the data pulse can be reduced more effectively.

  Further, each data pulse is added to the discharge delay time of the plasma display panel by 0.2 μsec or more from the later time of the start time of the data pulse and the start time of the scan pulse corresponding to the data pulse. It is preferable to end after a lapse of time. Thereby, the write discharge can be surely generated.

  Furthermore, each of the data pulses may start at the same time as or before the start of the scan pulse corresponding to the data pulse, and each data pulse corresponds to the data pulse. It is preferable to start after the end of the scan pulse immediately before the scan pulse. Alternatively, each data pulse may start after the end of the previous data pulse and before the end of the scan pulse corresponding to the previous data pulse. .

  Furthermore, the next data pulse of this data pulse may start simultaneously with the end of each data pulse. Thereby, when a data pulse is continuously applied to a certain data electrode, the potential of the data electrode does not change, and a displacement current does not flow to this data electrode. Thereby, current consumption of the data driver circuit can be reduced.

  As described above, according to the present invention, since the data pulse is terminated before the scanning pulse is terminated in the scanning period, the wall charges between the surfaces once formed are canceled with the termination of the scanning pulse. Can be suppressed, and the minimum sustain voltage that can normally generate the sustain discharge in the sustain period can be reduced. As a result, the sustain pulse voltage can be reduced and the withstand voltage of the sustain driver can be set low. Thereby, the cost of the plasma display panel can be reduced.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. First, a first embodiment of the present invention will be described. FIG. 1 is a waveform diagram showing a temporal relationship between a scanning pulse and a data pulse in the PDP driving method according to this embodiment. The configuration of the PDP in this embodiment is the same as that of the conventional PDP shown in FIGS. In the PDP driving method according to the present embodiment, as shown in FIG. 1, in the scanning period 3, the end timing 7b of the data pulse 7 is more time t1 than the end timing 6b of the scanning pulse 6 corresponding to the data pulse 7. Only getting faster. The start timing 7a of the data pulse 7 is the same as the start timing 6a of the scan pulse 6 corresponding to this data pulse. The driving method other than the above in this embodiment is the same as the driving method of the conventional PDP shown in FIG. That is, as shown in FIG. 9, in the PDP driving method according to this embodiment, one field is composed of a plurality of subfields (SF), and one subfield 5 is an initialization period 2 and a scanning period. 3 and the sustain period 4, and the driving method in the initialization period 2 and the sustain period 4 is the same as the driving method of the conventional PDP.

  Next, the operation in the scanning period 3 in the method for driving the PDP according to the present embodiment will be described in more detail. As described above, the operation in the initialization period 2 in the present embodiment is the same as the above-described conventional PDP driving method. Therefore, at the end of the initialization period 2, wall charges as shown in FIG. 10A are formed in all the cells.

  As shown in FIG. 1, in the scanning period 3, first, the potential of the scanning electrode S1 is changed from the positive potential Vbw to the ground potential, and the scanning pulse 6 is applied to the scanning electrode S1. Then, after a predetermined time has elapsed, the potential of the scan electrode S1 is returned from the ground potential to the positive potential Vbw, and the scan pulse 6 is terminated. Thereafter, after a predetermined blank period t11, the scan pulse 6 is applied to the scan electrode S2. Thereafter, after a blank period t11 again, the scan pulse 6 is applied to the scan electrode S3. Thereafter, similarly, the scan pulse 6 is sequentially applied to the scan electrodes S4, S5,. Then, in synchronization with these scanning pulses 6, a data pulse 7 is selectively applied to the data electrodes D (D1 to Dn) based on display data. At this time, when the data pulse 7 is applied to the data electrode D, the data pulse 7 is started at the same timing as the start of the corresponding scan pulse 6. That is, the start timing 6a of the scan pulse 6 and the start timing 7a of the data pulse 7 are made to coincide with each other. Then, after the data pulse 7 is terminated, the scanning pulse 6 is terminated. That is, the end timing 7b of the data pulse 7 is set before the end timing 6b of the corresponding scan pulse 6 by the time t1. The time t1 is set to 0.2 μsec or more, for example.

  In a certain cell, when the scan pulse 6 and the data pulse 7 are simultaneously applied, a voltage higher than the counter discharge start voltage is applied between the scan electrode S and the data electrode D, and a write discharge is generated between both electrodes. . Precisely, the write discharge is generated after a certain period of time after a voltage higher than the counter discharge start voltage is applied between the scan electrode S and the data electrode D. This phenomenon is called discharge delay. The time required for the discharge varies with each discharge and varies with a probabilistic distribution. Generally, the time until discharge occurs with a probability of 99.9% is defined as the discharge delay time. After a voltage equal to or higher than the counter discharge start voltage is applied between the counter electrodes, if this discharge delay time elapses, a write discharge is generated with a probability that there is substantially no problem. After a lapse of time, it may be considered that the write discharge is normally generated. The width of the data pulse is preferably 0.2 μsec or longer than the discharge delay time.

  2A to 2C are schematic cross-sectional views showing the charge distribution in the cell after the occurrence of the write discharge in time order in the method for driving the PDP according to the present embodiment, and FIG. The state just before the end of the data pulse 7 is shown, (b) shows the state immediately after the end of the data pulse 7, and (c) shows the state just before the end of the scanning pulse 6. When a write discharge is generated between the scan electrode S and the data electrode D in a certain cell, a large amount of space charge is generated in the discharge space of the cell along with the write discharge. Due to the generation of the space charge, a surface discharge is induced between the scan electrode S and the sustain electrode C, and wall charges are also accumulated on the sustain electrode C. As a result, immediately before the end of the data pulse 7, the wall charges and space charges are in the state shown in FIG. That is, the positive wall charge 10 is accumulated on the scan electrode S to which the ground potential is applied, the negative wall charge 11 is accumulated on the sustain electrode C to which the positive potential Vs is applied, and the positive potential Vd is applied. As a result, almost no wall charges are accumulated on the data electrode D whose potential is intermediate between the potential of the scan electrode S and the potential of the sustain electrode C. A large amount of space charge 12 is generated in the discharge space. At this time, the voltage applied in the discharge space is lower than the discharge start voltage due to the generation of the wall voltage, and the space charge does not increase any more.

  From this state, when the potential of the data electrode D decreases to the ground potential as the data pulse 7 ends, a new electric field is generated between the scan electrode S and the data electrode D and between the sustain electrode C and the data electrode D. The wall charges and space charges in the cell are as shown in FIG. At this stage, the scan pulse 6 has not yet ended, and the ground potential is applied to the scan electrode S. As shown in FIG. 2B, when the potential of the data electrode D decreases from the potential Vd to the ground potential, positive space charges are attracted on the data electrode D, and negative space charges are mainly on the sustain electrodes C. Is attracted to the wall charge. It should be noted that the negative space charge is also slightly attracted onto the scan electrode S. At the potential change amount Vd of the data electrode D at this time, no voltage higher than the discharge start voltage is applied in the cell, so that no new discharge is generated and no new space charge is supplied into the cell. Accordingly, the space charge in the discharge space is attracted onto each electrode and rapidly decreases, and the space charge 12 as shown in FIG.

  In this state, the scan pulse 6 ends, and the potential of the scan electrode S is raised from the ground potential to the positive potential Vbw. Since the potential change amount Vbw at this time is smaller than the discharge start voltage, no discharge occurs and no new space charge is generated. At this time, since the potential of the scan electrode S changes positively, negative space charges are attracted to the scan electrode S, and positive space charges are attracted to the sustain electrode C. As a result, wall charges are accumulated in a direction to cancel the wall voltage formed during the write discharge. However, as shown in FIG. 2C, since the space charge 12 in the discharge space is reduced at the end of the scan pulse 6, the wall newly accumulated on the scan electrode S and the sustain electrode C. The amount of charge is extremely small, and the wall voltage change accompanying the end of the scan pulse 6 is significantly smaller than that of the conventional driving method. As a result, in the cell in which the write discharge is generated, the wall voltage formed by the write discharge can be suppressed from decreasing with the end of the scan pulse 6. Thereby, at the end of the scanning period 3, a large wall voltage can be left in the cell in which the write discharge is generated.

  On the other hand, in the conventional PDP driving method, as shown in FIG. 13B, since a large amount of space charge 12 exists in the discharge space immediately before the end of the scan pulse 6, the scan electrode When the potential of S increases from the ground potential to the positive potential Vbw, as shown in FIG. 13C, the space charge 12 moves so as to cancel the wall voltage, and the wall voltage is greatly reduced. As a result, at the end of the scanning period 3, the wall voltage remaining in the cell in which the write discharge is generated becomes small.

  As described above, in the present embodiment, by terminating the data pulse 7 before the end of the scanning pulse 6, a large amount of space charge generated by the write discharge is changed into a space charge by changing the potential of the data electrode D. The space charge can be reduced by drawing the wall charge. Since the scan pulse 6 is terminated in a state where the space charge 12 is reduced, it is possible to suppress the wall charge from being reduced due to a decrease in the potential difference between the scan electrode S and the sustain electrode C. As a result, at the end of the scanning period 3, a large wall voltage can be formed in the cell in which the write discharge is generated. As a result, in the sustain period 4, a sustain discharge can be generated by superimposing a relatively small first sustain pulse on the large wall voltage. That is, in this embodiment, the voltage Vs of the sustain pulse can be reduced as compared with the conventional PDP driving method.

  Next, the driving method of the PDP according to the above-described embodiment will be described by exemplifying specific numerical values. The voltage of each pulse is the same as the conventional driving method described above. That is, the positive potential Vbw applied to the scan electrode S in the scanning period 3 is set to 80 to 110 V, the positive potential Vs applied to the sustain electrode C is set to about 170 V, and the potential Vd applied to the data electrode D is set to about 70 V. The width of the scan pulse 6 is 2.4 μsec (microseconds), and the blank period t11 between the scan pulse 6 and the next scan pulse 6 is 0.3 μsec. Further, the time t1 from the end point of the data pulse 7 to the end point of the corresponding scan pulse 6 is set to about 0.2 to 0.6 μsec. Then, an isolated point display in which only one white display cell is provided in the black display is performed. Under such conditions, the minimum sustain voltage Vdsmin that can operate normally is measured.

  FIG. 3 is a graph showing the dependence of the minimum sustain voltage on the time t1, with the time t1 on the horizontal axis and the minimum sustain voltage Vdsmin on the vertical axis. In FIG. 3, the larger the time t1, the faster the data pulse ends than the scan pulse. When the time t1 is a negative value, the end of the data pulse is later than the end of the scan pulse. It is shown that. As shown in FIG. 3, the conventional minimum sustain voltage Vdsmin is 152 V as described above. In the present embodiment, the minimum sustain voltage Vdsmin is about 142 to 142 V lower than this by 7 to 10 V under the above-described conditions. It can be about 145V.

  FIG. 3 shows the time t1 dependence of the minimum sustain voltage when the width of the scan pulse is changed. As shown in FIG. 3, when the time t1 is increased from −0.2 μsec, the minimum sustain voltage Vdsmin once decreases, reaches a minimum value, and then starts increasing. The reason for the increase is that if the time t1 is too long, the time during which the data pulse is applied is reduced, the duration of the write discharge is shortened, and the amount of generated space charge is insufficient. That is, the original wall charge amount accumulated in the scan electrode S and the sustain electrode C is reduced.

  As the width of the scan pulse is larger, the time t1 at which the minimum sustain voltage Vdsmin becomes the minimum value becomes longer and the absolute value of the minimum value becomes smaller. That is, when the scan pulse width is 1.2 μsec, the minimum sustain voltage Vdsmin takes a minimum value of about 158 V when t1 is 0.2 μsec, but when the scan pulse width is 1.6 μsec, t1 is When 0.4 μsec, the minimum sustain voltage Vdsmin takes a minimum value of about 151 V, and when the scan pulse width is 2.0 μsec, the minimum sustain voltage Vdsmin has a minimum value of about 146 V when t1 is 0.6 μsec. In the case where the width of the scan pulse is 2.4 μsec, the minimum sustain voltage Vdsmin takes a minimum value of about 142 V when t1 is 1.0 μsec.

  Thus, as shown in FIG. 3, even if the width of the scanning pulse is reduced to 1.2 μsec, there is an effect of lowering the minimum sustain voltage Vdsmin by providing the time t1. In addition, when the time t1 is increased from 0 to 0.2 μsec in the range of the scan pulse width of 1.2 to 2.4 μsec, the minimum sustain voltage Vdsmin is significantly lowered. Accordingly, the time t1 is preferably set to 0.2 μsec or more.

  In addition, the discharge delay time in the present embodiment is 0.8 μsec, and the minimum sustain voltage Vdsmin increases abruptly when the data pulse width is reduced to 0.8 μsec in any scan pulse width described above. On the other hand, the minimum sustain voltage Vdsmin can be significantly reduced as compared with the conventional case (t1 = 0 μsec) by making the width of the data pulse longer than the discharge delay time by 0.2 μsec or more. The above-described characteristics can be obtained not only when isolated points are displayed but also when displaying various display patterns.

  Next, a second embodiment of the present invention will be described. FIG. 4 is a waveform diagram showing a temporal relationship between the scan pulse and the data pulse in the PDP driving method according to the present embodiment. The configuration of the PDP in this embodiment is the same as that of the conventional PDP shown in FIGS. In the PDP driving method according to the present embodiment, as shown in FIG. 4, in the scanning period 3, the end timing 7b of the data pulse 7 is more time t1 than the end timing 6b of the scanning pulse 6 corresponding to the data pulse 7. Only getting faster. The start timing 7a of the data pulse 7 is earlier than the start timing 6a of the scan pulse 6 corresponding to this data pulse by a time t2. The driving method other than the above in this embodiment is the same as the driving method of the PDP according to the first embodiment described above.

  In the present embodiment, as in the first embodiment described above, the data pulse 7 ends before the end of the scan pulse 6, and as shown in FIGS. 2B and 2C, the data pulse 7 The space charge 12 in the discharge cell decreases due to the change in the potential of the data electrode D accompanying the end of. For this reason, even if the potential difference between the scan electrode S and the sustain electrode C decreases with the end of the scan pulse 6, it is possible to prevent the wall charges from decreasing.

  In this embodiment, when the time difference t2 between the start timing 7a of the data pulse 7 and the start timing 6a of the scan pulse 6 shown in FIG. 4 is less than the blank time of the scan pulse 6, for example, less than 0.3 μsec, The minimum sustain voltage Vdsmin hardly depends on the time t2, and a characteristic similar to the characteristic shown in FIG. 3 of the first embodiment can be obtained for each scanning pulse width.

  On the other hand, when the time t2 becomes equal to the blank time of the scan pulse 6, for example 0.3 μsec, the start timing 7a of the data pulse 7 becomes the same timing as the end timing 6b of the previous scan pulse 6. At this time, the value of the minimum sustain voltage Vdsmin is increased by about 4 V compared to the case of t2 = 0.2 μsec. The ease with which the first sustain discharge is generated also slightly depends on the wall voltage between the sustain electrode C and the data electrode D. The greater the wall voltage formed between the two electrodes, the more the first sustain discharge is generated. When a pulse is applied, a large potential difference is applied to the discharge space between the sustain electrode C and the data electrode D, and a sustain discharge is likely to occur. When the next data pulse is applied, the potential difference between the sustain electrode C and the data electrode D decreases, but the space charge decreases after the scan pulse 6 ends. The wall voltage hardly changes. On the other hand, when the next data pulse 7 is applied simultaneously with the end of the scan pulse 6, the data electrode potential changes before the space charge decreases due to the end of the scan pulse 6. The wall voltage between and above D decreases. For this reason, the first sustain discharge is less likely to occur, and the minimum sustain voltage Vdsmin increases. Therefore, it is better not to make the start timing 7a of the data pulse 7 coincide with the end timing 6b of the previous scan pulse 6. In this embodiment, the characteristics do not depend on the display content, and the minimum sustain voltage Vdsmin is the same value whether or not the data pulse immediately after the data pulse to be evaluated is applied. is there.

  Further, when the scan pulse 6 starts after the data pulse 7 starts as in the present embodiment, the time obtained by adding a time of 0.2 μsec or more to the discharge delay time after the scan pulse 6 starts. After that, the data pulse 7 is preferably terminated. That is, the time interval between the start timing 6a of the scan pulse 6 and the end timing 7b of the data pulse 7 corresponding to the scan pulse 6 may be a time obtained by adding 0.2 μsec or more to the discharge delay time. preferable.

  Next, a third embodiment of the present invention will be described. FIG. 5 is a waveform diagram showing a temporal relationship between the scan pulse and the data pulse in the PDP driving method according to the present embodiment. The configuration of the PDP in this embodiment is the same as that of the conventional PDP shown in FIGS. In the PDP driving method according to the present embodiment, as shown in FIG. 5, in the scanning period 3, the end timing 7b of the data pulse 7 is more time t1 than the end timing 6b of the scanning pulse 6 corresponding to the data pulse 7. Only getting faster. The start timing 7a of the data pulse 7 is earlier than the start timing 6a of the scan pulse 6 corresponding to the data pulse 7, and is earlier than the end timing 6b of the previous scan pulse 6 by a time t3. The blank time between the data pulses 7 is t4, and therefore t1 = t3 + t4. The time t3 is 0.2 μsec, for example, and the time t4 is 0.4 μsec, for example. The driving method other than the above in this embodiment is the same as the driving method of the PDP according to the first embodiment described above.

  In this embodiment, when the data pulse 7 immediately after a certain data pulse 7 is applied as in “all white display”, the data electrode potential is (potential) before the end of the scanning pulse 6. Vd → ground potential → potential Vd) and changes twice. For this reason, the space charge can be reduced as compared with the first and second embodiments described above. Accordingly, it is possible to suppress a decrease in wall charges accompanying a decrease in the potential difference between the scan electrode S and the sustain electrode C at the end of the scan pulse 6 as compared with the first and second embodiments described above. On the other hand, as for the wall voltage between the sustain electrode C and the data electrode D, the data pulse 7 after the scan pulse 6 is applied before the end of the scan pulse 6, so that the space voltage is larger than in the above two embodiments. A large amount of electric charge will be present, and the wall voltage between the sustain electrode C and the data electrode D will be further reduced. As described above, the wall voltage between the scan electrode S and the sustain electrode C works in the direction of decreasing the minimum sustain voltage Vdsmin, and the wall voltage between the sustain electrode C and the data electrode D is This works in the direction of increasing the minimum sustain voltage Vdsmin. When the minimum sustain voltage Vdsmin was actually measured in the present embodiment, it was possible to obtain the minimum sustain voltage Vdsmin substantially equivalent to the above two embodiments.

  On the other hand, when the next data pulse 7 is not applied to a certain data pulse 7 as in “isolated point display”, the present embodiment is compared with the first and second embodiments described above. Thus, only the start timing of the data pulse 7 is different. If the start timing 7a of the data pulse 7 is the same as the start timing 6a of the scan pulse 6 or is earlier in time, the minimum sustain voltage Vdsmin is constant. For this reason, in such a display, the minimum sustain voltage Vdsmin has a value equivalent to that of the above-described two embodiments.

  Next, a fourth embodiment of the present invention will be described. FIG. 6 is a waveform diagram showing a temporal relationship between the scan pulse and the data pulse in the PDP driving method according to the present embodiment. The configuration of the PDP in this embodiment is the same as that of the conventional PDP shown in FIGS. In the PDP driving method according to this embodiment, as shown in FIG. 6, the start timing 7 a of the data pulse 7 is the same as the end timing 7 b of the previous data pulse 7 in the scanning period 3. . The end timing 7b of the data pulse 7 is earlier than the end timing of the scanning pulse 6 corresponding to the data pulse 7 by a time t5. In the present embodiment, the scanning pulse width is, for example, 1.2 μsec, which is shorter than the first to third embodiments described above. The time t5 from the end timing 7b of the data pulse 7 to the end timing 6b of the corresponding scan pulse 6 is set to 0.2 μsec, for example. The driving method other than the above in this embodiment is the same as the driving method of the PDP according to the first embodiment described above.

  In the present embodiment, the potential of the data electrode D does not change when the data pulse 7 is continuously applied as in “all white display”. For this reason, since no displacement current flows through the data electrode D, the power consumption of the data driver can be reduced. In such a display, the potential of the data electrode D in the present embodiment is the same as that of the conventional PDP driving method shown in FIG. 12, and the value of the minimum sustain voltage Vdsmin is the same as the conventional value, for example, 163V.

  On the other hand, in the case of “isolated point display”, the data pulse 7 ends earlier than the scan pulse 6 and the potential of the data electrode D is lowered, so that the space charge decreases. For this reason, it is possible to suppress a decrease in wall charges accompanying a decrease in potential difference between scan electrode S and sustain electrode C at the end of scan pulse 6. Generally, when the surrounding cells are not lit as in “isolated point display”, the priming effect due to the discharge of the surrounding cells is hardly obtained. For this reason, the discharge delay is larger than in the case of “full white display”. Further, when the scan pulse width is shortened to 1.2 μsec, for example, the time for which wall charges are accumulated by the write discharge becomes insufficient. Therefore, when “isolated point display” is performed in the conventional method shown in FIG. 12, the minimum sustain voltage Vdsmin is about 168 V, which is higher than that in the case of “full white display”. On the other hand, according to the present embodiment, the minimum sustain voltage Vdsmin can be reduced to about 161 V due to the above-described effect. When the minimum sustain voltage Vdsmin varies depending on the display content, the maximum value is the minimum sustain voltage Vdsmin of the driving method. Accordingly, in the case of the conventional method shown in FIG. 12, the minimum sustain voltage Vdsmin is about 168V, for example, but in the present embodiment, the minimum sustain voltage Vdsmin can be reduced to about 163V, for example.

FIG. 4 is a waveform diagram showing a temporal relationship between a scan pulse and a data pulse in the PDP driving method according to the first embodiment of the present invention. (A) thru | or (c) are typical sectional drawings which show the electric charge distribution in the cell after write discharge generate | occur | produces in order of time in the drive method of PDP which concerns on this embodiment, (a) is a data pulse. 7 shows a state just before the end of 7, (b) shows a state immediately after the end of the data pulse 7, and (c) shows a state just before the end of the scanning pulse 6. It is a graph which shows the dependence with respect to the time t1 of the minimum sustain voltage, taking the time t1 on the horizontal axis and taking the minimum sustain voltage Vdsmin on the vertical axis. It is a wave form diagram which shows the temporal relationship of the scanning pulse and data pulse in the drive method of PDP which concerns on the 2nd Embodiment of this invention. It is a wave form diagram which shows the temporal relationship between the scanning pulse and data pulse in the drive method of PDP which concerns on the 3rd Embodiment of this invention. It is a wave form diagram which shows the temporal relationship of the scanning pulse and data pulse in the drive method of PDP which concerns on the 4th Embodiment of this invention. It is sectional drawing which shows the structure of the cell in a plasma display panel. It is a top view which shows electrode arrangement | positioning of this plasma display. It is a wave form diagram which shows the drive method of the conventional 3 electrode AC type | mold plasma display panel. (A) thru | or (d) is typical sectional drawing which shows the drive method of this conventional PDP, and is a figure which shows distribution of the wall charge on each electrode. It is a wave form diagram which shows the temporal relationship between the scanning pulse in this conventional PDP drive method, and a data pulse. It is a wave form diagram which shows the temporal relationship between the scanning pulse and data pulse in the other conventional PDP driving method. (A) thru | or (c) is typical sectional drawing which shows the electric charge distribution in the cell after write-in discharge generate | occur | produces in order of time in the drive method of the conventional PDP.

Explanation of symbols

1; previous subfield 2; initialization period 2a; sustain erasing period 2b; priming period 2c; priming erasing period 3; scanning period 4; sustaining period 5; subfield 6; scan pulse 6a; End timing of pulse 7; Data pulse 7a; Start timing of data pulse 7b; End timing of data pulse 8; Sustain pulse 10; Positive wall charge 11; Negative wall charge 12; Space charge 20; Front substrate 21; Scan electrode 23, C, C1-Cm; sustain electrode 24; transparent dielectric layer 25; protective layer 26; discharge space cell 27; phosphor layer 28; white dielectric layer 29, D, D1 Dn; data electrode 30; display display screen 31; cell 32; metal trace electrode 33; barrier rib 34; 35; non-discharge gaps t1 to t5, t11; time

Claims (7)

First and second insulating substrates disposed opposite to each other, a plurality of scan electrodes provided alternately on the surface of the first insulating substrate facing the second insulating substrate and extending in the first direction; A sustain electrode, a first dielectric layer covering the scan electrode and the sustain electrode, and a second dielectric substrate provided on the surface of the second insulating substrate facing the first insulating substrate and orthogonal to the first direction A plurality of data electrodes extending in a direction, and a second dielectric layer covering the data electrodes, the data electrode including a nearest point of contact with the scan electrode and a nearest point of contact with the sustain electrode. In a driving method of an AC plasma display panel in which display is performed based on display data on an AC plasma display panel in which pixels are formed in a matrix, one field for displaying one image is displayed in one or more fields. The subfield comprises an initializing period for initializing the charge state in each pixel, a scan pulse is sequentially applied to the scan electrodes, and the display data is synchronized with the scan pulse. Based on the scan period in which a data pulse is applied to the data electrode to selectively form a wall charge in the pixel, and the wall charge is formed by alternately applying a voltage to the scan electrode and the sustain electrode. A sustain period for generating a sustain discharge between a scan electrode region corresponding to the scan electrode on the surface of the first dielectric layer in the pixel and a sustain electrode region corresponding to the sustain electrode, and The method of driving an AC type plasma display panel, wherein the data pulse synchronized with the scan pulse ends before the scan pulse ends. 2. The method of driving an AC type plasma display panel according to claim 1, wherein the data pulse synchronized with the scan pulse is finished 0.2 μsec or more before the end of each scan pulse. Each data pulse is a time obtained by adding 0.2 μsec or more to the discharge delay time of the plasma display panel from the later time of the start time of the data pulse and the start time of the scan pulse corresponding to the data pulse. 3. The method of driving an AC type plasma display panel according to claim 1, wherein the method is terminated after elapses. 4. The AC according to claim 1, wherein each data pulse starts at the same time as the start of a scan pulse corresponding to the data pulse or before the start of the scan pulse. 5. Type plasma display panel driving method. 5. The AC type plasma display according to claim 1, wherein each data pulse starts after the end of a scan pulse preceding the scan pulse corresponding to the data pulse. 6. Panel drive method. Each data pulse starts after the end of the previous data pulse and before the end of the scan pulse corresponding to the previous data pulse. The driving method of the AC type plasma display panel according to claim 1. 7. The driving method of an AC type plasma display panel according to claim 1, wherein the next data pulse of the data pulse starts simultaneously with the end of each data pulse.

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