KR100934325B1 - Plasma display device - Google Patents

Abstract

In the plasma display device of the present invention, the waveform of the drive voltage outputted by the drive unit of the plasma display device includes a sustain period in which a sustain pulse voltage for sustaining discharge is alternately applied to the scan electrode and the sustain electrode, Has a removal period in which an inclined waveform voltage having a different polarity is applied to an electrode different from the electrode to which the last sustain pulse voltage is applied, and misdischarge is suppressed and stable image display becomes possible.

Description

Plasma display device {PLASMA DISPLAY APPARATUS}

1 is a timing chart of waveforms of driving voltages output by a driving unit of a plasma display device according to a first embodiment of the present invention;

2 is a cross-sectional view showing a state of charge in the panel portion of the plasma display device of Embodiment 1 of the present invention;

3 is a timing chart of waveforms of drive voltages output by a drive unit of the plasma display device according to the second embodiment of the present invention;

4 is a timing chart of waveforms of drive voltages output by a drive unit of the plasma display device according to the second embodiment of the present invention;

5 is a timing chart of waveforms of drive voltages output by a drive unit of the plasma display device of Embodiment 3 of the present invention;

6 is a timing chart of waveforms of drive voltages output by a drive unit of the plasma display device of Embodiment 3 of the present invention;

7 is a timing chart of waveforms of drive voltages output by a drive unit of a plasma display device according to another embodiment of the present invention;

8 is a sectional perspective view showing the structure of a panel portion of a general plasma display device;                 

9 is a diagram showing a schematic configuration of a driving unit of a general plasma display device and a connection state of each electrode of the panel unit;

10A and 10B are cross-sectional views showing a state of charge in the panel portion of a conventional plasma display device.

<Description of the symbols for the main parts of the drawings>

1 substrate 2 scanning electrode

3: sustain electrode 4: dielectric layer

5: protective film 6: substrate

7 data electrode 8 dielectric layer

9: partition 10: phosphor

The present invention relates to a plasma display device which is known as a thin, lightweight display device on a large screen.

In the plasma display device, ultraviolet rays are generated by gas discharge, and phosphors are excited by the ultraviolet rays to emit light to perform color display.

There are two types of plasma display apparatus, which are AC type and DC type in driving, and there are two types of discharge type in surface discharge type and counter discharge type, but they are manufactured according to high precision, large size and simple structure. From the simplicity of the present invention, in the present situation, a surface discharge type plasma display device having a three-pole structure is mainstream. The general structure of the panel part of this plasma display apparatus is shown in FIG.

On the transparent and insulating substrate 1 such as glass, the scan electrode 2 and the sustain electrode 3 are disposed to face each other by a distance MG (hereinafter referred to as a main discharge gap MG), Further, a plurality of pairs of scan electrodes 2 and sustain electrodes 3 are arranged apart by a distance IPG (hereinafter, referred to as a gap IPG between adjacent discharge cells). The dielectric layer 4 and the protective film 5 are provided to cover the scan electrode 2 and the sustain electrode 3. Further, a large number of data electrodes 7 are provided on an insulating substrate 6 such as glass, and a dielectric layer 8 is provided to cover the data electrodes 7. The partition 9 is provided on the dielectric layer 8 between the data electrodes 7 in parallel with the data electrodes 7. The fluorescent substance 10 is provided in the surface of the dielectric layer 8 and the side surface of the partition 9. Subsequently, the substrate 1 and the substrate 6 are disposed to face each other such that the scan electrode 2, the sustain electrode 3, and the data electrode 7 are perpendicular to each other, and the pair of the scan electrode 2 and the sustain electrode 3 are paired. The portion where) crosses the data electrode 7 becomes the discharge cell 11. The discharge cell 11 is filled with at least one gas of helium, neon and argon and xenon as discharge gas.

The schematic structure of the drive part which outputs the drive voltage for driving the panel part shown in FIG. 8, and the wire connecting state of each electrode of the panel part are shown in FIG. The arrangement of the electrodes in the panel portion is a matrix structure of m × n. The data electrodes 7 for addressing are arranged in m columns in the column direction, and the scan electrodes 2 and sustains for holding discharge in the row directions. The electrodes 3 are paired and arranged in n rows.                         

The drive section includes a data write drive circuit 12, a scan drive circuit 13, an initialization circuit 14, and a sustain drive circuit 15. The data write driving circuit 12 is a circuit for outputting a driving voltage to the data electrode 7 and is connected to m output terminals with respect to each of the data electrodes 7. The scan drive circuit 13 is a circuit for outputting a drive voltage to the scan electrode 2 and is connected to n output terminals with respect to each of the scan electrodes 2. The sustain driving circuit 15 is a circuit for outputting a driving voltage to the sustain electrode 3, and is commonly connected to the sustain electrode 3. The initialization circuit 14 is a circuit for performing an initialization operation which is a drive operation for accumulating initial charges in each electrode which has no accumulation of charge before energization.

However, in the plasma display device including the panel portion and the driving portion described above, a problem is that misdischarge occurs when the discharge cell pitch is made small, particularly for high precision, in the Y direction in the panel portion shown in FIG. 8. Occurs.

This cause is caused by the following mechanism. For example, the state of the wall voltage on the surface of the protective film 5 on the scan electrode SCNi after the last sustain discharge is applied is changed from negative to positive. This is realized when positive ions reach the surface of the protective film 5. However, since the moving speed μion of the positive ions is very slow compared to the moving speed μe of the electrons, for example, switching in the vicinity of the main discharge gap MG where the moving distance of the positive ions becomes short is easily performed. However, there is a high probability that the positive ions are not reached at the time of switching outside the scan electrode SCNi, which requires a long moving distance with respect to the positive ions, and eventually near the gap IPG between the adjacent discharge cells. The negative charge 16 is left without neutralizing near the outside of the SCNi and eventually near the gap IPG between the adjacent discharge cells. This state is shown in Fig. 10A. FIG. 10A is a view seen from the arrow direction of the cross section 10A-10A in FIG. 8, where "+" and "-" show electric charges, but are conceptual only, and the number and the like are not exact.

Then, when the operation in the subsequent erasing period and the wall voltage adjustment period is performed while the negative charge 16 remains, the wall voltage is adjusted, but the unnecessary negative charge 16 remaining near the gap IPG between adjacent discharge cells is performed. Will remain the same.

If the scan pulse voltage Vad (V) is applied to the scan electrode SCNi and the write pulse voltage Vw (V) is applied to the data electrode Dj by the write operation in the write period in this state, The discharge 17 is generated between the unnecessary negative charge 16 remaining near the gap IPG between the adjacent discharge cells and the data electrode Dj (FIG. 10B), and at the same time a large amount of discharge is generated in accordance with the discharge 17. Priming effect particles (semi-stable atoms, ions, etc.) are generated. Here, priming effect particles generated when the discharge 17 is generated near the adjacent discharge cell gap IPG easily enter the adjacent discharge cell, which is remarkable when the pitch of the discharge cell 11 is narrow for high precision. Become. And in the Y direction shown in FIG. 8, since the discharge area | region as shown in the partition 9 in the X direction is not physically regulated, priming effect particle | grains mainly flow in the adjacent discharge cell of a Y direction, and the priming which flowed in is introduced. Since the effect particles change the wall voltage of the discharge cell 11, as a result, there is a problem of erroneous discharge such as writing in the Y direction and poor writing.

 A plasma panel having a substrate in which a plurality of pairs of scan electrodes and sustain electrodes are formed; a panel unit in which data substrates are formed so as to be orthogonal to scan electrodes and sustain electrodes; and a driving unit for outputting a driving voltage for driving the panel unit. In the display device, a sustain period in which a sustain pulse voltage for sustaining discharge is alternately applied to the scan electrode and the sustain electrode, and an electrode to which the last sustain pulse voltage is applied to an inclined waveform voltage having a different polarity from the sustain pulse voltage. A plasma display device having a removal period applied to an electrode different from is provided.

(Embodiment 1)

EMBODIMENT OF THE INVENTION Below, Embodiment 1 of this invention is described using drawing. In addition, the panel part in Embodiment 1 is the same as the panel part shown in FIG. 8, The schematic structure of the drive part which outputs the drive voltage for driving this panel part, and the connection state with each electrode of a panel part are shown in FIG. Same as shown. Therefore, their explanation is omitted.

FIG. 1 is a diagram showing waveforms of drive voltages output by a drive unit for driving the panel unit of the plasma display device of the first embodiment. The initialization period for accumulating the initial charge and the subsequent one field period are shown for each electrode having no charge accumulation before energization.

One screen is displayed in one field period and is composed of, for example, a plurality of first to eighth subfields. One subfield is constituted by the wall voltage adjusting period, the writing period, the holding period, and the removing period. The operation in each of these periods will be described below.

First, the operation in the initialization period will be described. In this initialization period, first, all data electrodes D1 to Dm and all scan electrodes SCN1 to SCNn are held at 0 (V), and all scan electrodes from SUS1 to SUSn are all scanned from 0 (V). A bipolar waveform driving voltage rapidly rises to the potential Vpu (V) which becomes the discharge start voltage or less with respect to the electrodes SCN1 to SCNn, and then slowly rises to the potential Vru (V) that exceeds the discharge start voltage. Is applied. In this gentle rising process, in each discharge cell 11, the first weakness from all sustain electrodes SUS1 to SUSn to all data electrodes D1 to Dm and all scan electrodes SCN1 to SCNn is weak. Initialization discharge occurs, negative wall voltage is accumulated on the surface of the protective film 5 on the sustain electrodes SUS1 to SUSn, the surface of the phosphor 10 on the data electrodes D1 to Dm, and the protective film on the scan electrodes SCN1 to SCNn. (5) The positive wall voltage is accumulated on the surface. From this state, the potentials of all the sustain electrodes SUS1 to SUSn are lowered toward 0 (V) with the gentleness that the discharge does not occur between the electrodes. By the above, the initialization operation by an initialization period is complete | finished.

Next, the operation in the wall voltage adjustment period will be described. In this wall voltage adjustment period, 0 (V) is applied to all sustain electrodes SUS1 to SUSn and all data electrodes D1 to Dn, and from 0 (V) to Vrc (for all scan electrodes SCN1 to SCNn). A driving voltage of a bipolar waveform that rises gently toward V) is applied. In this gentle ascending process, in all the discharge cells 11, all the sustain electrodes SUS1 to SUSn are negative, and a weak discharge is made positive for all the scan electrodes SCN1 to SCNn, and all the scan electrodes SCN1 are generated. The positive wall voltage of the surface of the protective film 5 on ˜SCNn and the negative wall voltage of the surface of the protective film 5 on the sustain electrodes SUS1 to SUSn are written once in the writing period performed after the wall voltage adjustment period. Adjusted to the wall voltage suitable for operation. Subsequently, after 0 (V) is applied to all the scan electrodes SCN1 to SCNn, a driving voltage having a waveform slowly falling toward Vns (V) is applied to all of the sustain electrodes SUS1 to SUSn. A driving voltage of a waveform slowly rising from 0 (V) to Ve (V) is applied. At the time of application of these drive voltages, a slight discharge occurs in which all sustain electrodes SUS1 to SUSn and all data electrodes D1 to Dm are positive, and all scan electrodes SCN1 to SCNn are negative, and all data electrodes are generated. Positive wall voltage on the surface of the phosphor 10 on D1 to Dm and negative wall voltage on the surface of the protective film 5 on all the sustain electrodes SUS1 to SUSn and the protective film 5 on all the scan electrodes SCN1 to SCNn. The positive wall voltage of the surface is adjusted to a wall voltage suitable for the writing operation in the writing period performed after the wall voltage adjusting period. By the above, the wall voltage adjustment period ends.

Next, the operation in the writing period will be described. In this writing period, the potential Vsc (V) is applied to all the scan electrodes SCN1 to SCNn, and the potential Ve is subsequently applied to all the sustain electrodes SUS1 to SUSn. In addition, the positive potential Vw (to the predetermined data electrode Dj (j represents an integer of 1 to m) corresponding to the discharge cell 11 to be displayed on the first row among the data electrodes D1 to Dm. The write pulse voltage of V)) is applied, and the potential Vad (V) of negative polarity is applied to the scan electrode SCN1 of the first row. At this time, the potential difference between the surface of the phosphor 10 at the intersection (first intersection) of the predetermined data electrode Dj and the scan electrode SCN1 and the surface of the protective film 5 on the scan electrode SCN1 is The potential Vw of the data waveform is added to the positive wall voltage of the surface of the phosphor 10 on the data electrode Dj by subtracting the negative wall voltage of the surface of the protective film 5 on the scan electrode SCN1 (that is, the absolute value). Add-in), write discharge occurs between the predetermined data electrode Dj and the scan electrode SCN1 at the first crossing portion. At the same time, the write discharge is caused, and at the first crossing portion, the write discharge also occurs between the sustain electrode SUS1 and the scan electrode SCN1, and the surface of the protective film 5 on the scan electrode SCN1 of the first intersection portion is positive. The wall voltage is accumulated, and a negative wall voltage is accumulated on the surface of the protective film 5 on the sustain electrode SUS1 of the first crossing portion.

The same operation is continued until the nth line, and the writing operation of the writing period is finished.

Next, the operation in the sustain period will be described. In this sustain period, the sustain waveforms of the potential Vst (V) are alternately applied to all the scan electrodes SCN1 to SCNn and all the sustain electrodes SUS1 to SUSn, thereby causing the discharge cells 11 to generate the write discharge. Sustain discharge is continuously performed. Visible light emission from the phosphor 10 excited with ultraviolet rays generated by the sustain discharge is used for display.

Here, the states of the wall voltages of the scan electrode SCNi and the sustain electrode SUSi of the discharge cell 11 in which sustain discharge is continuously performed are as follows. First, when Vst (V) is applied to the scan electrode SCNi and 0 (V) is applied to the sustain electrode SUSi, a discharge is generated from the scan electrode SCNi toward the sustain electrode SUSi. Positive ions move from SCNi toward sustain electrode SUSi, and electrons move from sustain electrode SUSi toward scan electrode SCNi, and as a result, the wall voltage on the surface of protective film 5 on sustain electrode SUSi. By the positive amount, the wall voltage on the surface of the protective film 5 on the scan electrode SCNi becomes negative. Next, when the application of the sustain pulse voltage Vst (V) is switched, 0 (V) is applied to the scan electrode SCNi, and Vst (V) is applied to the sustain electrode SUSi, the sustain electrode SUSi. Discharge occurs from the toward scan electrode SCNi, and the same positive ions and electrons move accordingly, so that the wall voltage on the surface of the protective film 5 on the sustain electrode SUSi is positive to negative, and the scan electrode SCNi The wall voltage of the surface of the protective film 5 on the phase is switched from negative to positive. After the above operation is repeated, sustain discharge ends with Vst (V) applied to sustain electrode SUSi and 0 (V) applied to scan electrode SCNi. At this time, the wall voltage of the surface of the protective film 5 on the sustain electrode SUSI is changed from positive to negative, and the wall voltage of the surface of the protective film 5 on the scan electrode SCNi is switched from negative to positive. The maintenance period ends in this state.

Next, the operation in the removal period will be described. In this removal period, the data electrode Dj is held at Vrd (V) and the sustain electrode SUSi at 0 (V), and in this state, the data electrode Dj is gently lowered toward the Vnr (V) with respect to the scan electrode SCNi. A ramp waveform voltage is applied. Then, as shown in FIG. 2, a weak discharge 18 is generated while the data electrode Dj is positive and the scan electrode SCNi is negative while the inclined waveform voltage is lowered. Since unnecessary negative charges 16 remaining on the protective film 5 on (SCNi) are removed, it is possible to suppress the occurrence of erroneous discharges. Here, FIG. 2 is a figure seen from the arrow direction of the 10A-10A cross section in FIG.                     

As a result, the erase operation in the removal period is completed.

Then, by repeating the operation of the subfield period starting from the wall voltage adjustment period, one field period is constituted, and image display is performed.

As described above, in the present invention, generation of erroneous discharge is provided by providing a removal period in which an inclined waveform voltage having a different polarity from the sustain pulse voltage is applied to an electrode different from the electrode to which the last sustain pulse voltage is applied. It becomes possible to suppress it. Therefore, a plasma display device capable of performing stable image display even in a highly accurate discharge cell structure can be obtained.

In addition, in the above description, when the scan electrode is set to A and the sustain electrode is set to B, the example in which the arrangement of the substrate 1 is repeated is ABAB. The same effect can be obtained also in an ABBA array in which electrodes of the same kind are arranged in between. Here, when the precision is high, the number of discharge cells increases, so that the capacitance between the electrodes in the panel portion increases and the reactive power increases in the ABAB array, but the ABBA array reduces the capacitance in the gap between adjacent cells. In this way, it is possible to suppress the generation of reactive power, and thus to suppress the power consumption of the plasma display device.

In addition, the minimum voltage value Vnr (V) of the ramp waveform voltage applied in the removal period is equal to the discharge start voltage value Vf1 (V) between the data electrode Dj and the scan electrode SCNi. Vf1-60)? Vnr? -30 is preferable because the effect in Embodiment 1 is further enhanced.                     

(Embodiment 2)

Next, Embodiment 2 of this invention is described using drawing. In addition, the panel part in Embodiment 2 is the same as the panel part shown in FIG. 8, The schematic structure of the drive part which outputs the drive voltage for driving this panel part, and the connection state with each electrode of a panel part are shown in FIG. Same as shown. Therefore, the description thereof is omitted, and the second embodiment is different from the conventional one by using FIG. 3 below.

FIG. 3 is a diagram showing waveforms of drive voltages output by the drive unit for driving the panel unit of the plasma display device according to the second embodiment, showing sustain periods, wall voltage adjustment periods, and write periods.

The second embodiment differs from the prior art in that the peak voltage Vsh (V) of the last sustain pulse in the sustain period is changed from the peak voltage Vst (V) of the sustain pulse before it and the discharge start voltage Vf2 ( For V)), Vst ≤ Vsh <Vf2.

This action is as follows. Since the peak voltage Vsh (V) of the last sustain pulse is larger than the peak voltage Vst (V) of the previous sustain pulse, the electrical attraction force for both ions during the last sustain discharge of the sustain period. Because of this increase, the positive ions can reach the outside of the scan electrode SCNi, which requires a long moving distance with respect to the positive ions, and eventually near the gap IPG between the adjacent discharge cells. As a result, the negative to positive switching of the surface wall voltage of the protective film 5 on the scan electrode SCNi after the last sustain discharge is applied is sufficiently performed, and unnecessary negative charges do not remain. It is said to disappear.                     

As described above, the peak voltage value Vsh (V) of the last sustain pulse voltage is the peak voltage value Vst (V) of the previous sustain pulse voltage and the discharge start voltage between the scan electrode and the sustain electrode. With respect to the value Vf2 (V), it becomes possible to suppress erroneous discharge by setting the relationship such that Vst < = Vsh &lt; Vf2. Therefore, a plasma display device capable of performing stable image display even in a highly accurate discharge cell structure can be obtained.

Here, as the waveform of the driving voltage, unnecessary negative charges remaining in the waveform of the driving voltage in the second embodiment as shown in FIG. 4 in the vicinity of the gap IPG between the adjacent discharge cells as shown in the first embodiment. It is preferable to apply the waveform of the driving voltage in the removal period for removing the electrons because the effect of removing unnecessary negative charges is further enhanced.

Further, the voltage value Vsh (V) of the last sustain pulse voltage is Vst ≤ Vsh <Vf2, preferably (Vf2-, with respect to the discharge start voltage value Vf2 (V) between the scan electrode and the sustain electrode. 50)? Vsh <(Vf2-30) is preferable because the effect of Embodiment 2 is further enhanced.

(Embodiment 3)

EMBODIMENT OF THE INVENTION Below, Embodiment 3 of this invention is described using drawing. In addition, the panel part used in Embodiment 3 is the same as the panel part shown in FIG. 8, The schematic structure of the drive part which outputs the drive voltage for driving this panel part, and the connection state with each electrode of a panel part are shown in FIG. Same as shown. Therefore, the description thereof is omitted, and the third embodiment will be described below with reference to FIG.                     

FIG. 5 is a diagram showing waveforms of driving voltages output by the driving unit for driving the panel unit of the plasma display device of the third embodiment, showing sustain periods, wall voltage adjustment periods, and writing periods. The third embodiment differs from the prior art in that the third embodiment makes the pulse width ts2 of the last sustain pulse in the sustain period wider than the pulse width ts1 of the sustain pulse before it.

This action is as follows. Since the pulse width ts2 of the last sustain pulse voltage is larger than the pulse width ts1 of the previous sustain pulse voltage, the movement time of the positive ions becomes longer during the last sustain discharge of the sustain period, so that the positive ions Positive ions can reach the outside of the scan electrode SCNi, which requires a long moving distance, and eventually near the gap IPG between adjacent discharge cells. Therefore, since the wall voltage on the surface of the protective film 5 on the scan electrode SCNi is sufficiently switched from negative to positive, and unnecessary negative charges do not remain, the occurrence of erroneous discharge is eliminated.

As described above, erroneous discharge can be suppressed by making the pulse width ts2 of the last sustain pulse voltage larger than the pulse width ts1 of the previous sustain pulse voltage. Therefore, a plasma display device capable of performing stable image display even in a highly accurate discharge cell structure can be obtained.

Here, as the waveform of the driving voltage, unnecessary negative charges remaining in the waveform of the driving voltage in the third embodiment as shown in FIG. 6 in the vicinity of the gap IPG between the adjacent discharge cells as shown in the first embodiment. It is preferable to add a waveform of the driving voltage in the removal period for removing the electrons because the effect of removing unnecessary negative charges is further enhanced.

In addition, if the pulse width ts2 (k) of the last sustain pulse in the sustain period is assumed to be (ts1 + 2) ts2 ≦ 20 with respect to the previous sustain pulse width ts1 (b), It is preferable because the effect in the form 3 becomes higher.

In the above description, the driving method in which the pulse width of the last sustain pulse in the sustain period is expanded from the pulse width of the previous sustain pulse is used, but the present invention is not limited to this, but it is not limited to this. Needless to say, the same effect can be obtained even by using the driving method in which the pulse width of the sustain pulses after the third and the third pulses is larger than the pulse widths of the sustain pulses before that.

In Embodiments 1 to 3, the maximum voltage value Vrc (V) of the inclined waveform voltage applied to the scan electrode in the wall voltage adjustment period starts discharge between the data electrode Dj and the scan electrode SCNi. It is preferable to have a relationship such that (Vf1-50)? Vrc <Vf1 with respect to the voltage value Vf1 (V).

Further, in the first to third embodiments, the inclinations of the inclination waveform voltages in the removal period and the wall voltage adjustment period are required to be rapidly switched and smooth enough to not cause unnecessary discharge. It is preferable to set it as the range of 0.5V / Pa or more and 20V / Pa or less from a similar viewpoint.

In addition, as can be clearly seen from the above description, the scan electrodes SCN1 to SCNn and the sustain electrodes SUS1 to SUSn are completely the same in the panel portion, and are distinguished by the driving voltage applied. Therefore, the waveforms of the driving voltages applied to the scan electrodes SCN1 to SCNn and the waveforms of the driving voltages applied to the sustain electrodes SUS1 to SUSn shown in Embodiments 1 to 3 have the same effect. Needless to say.

In the above description, in the initialization period, from all the sustain electrodes SUS1 to SUSn, from 0 (V) to the potential Vpu (V) which is equal to or less than the discharge start voltage for all the scan electrodes SCN1 to SCNn. After a rapid rise, a driving voltage of a bipolar waveform slowly rising to the potential Vru (V) exceeding the discharge start voltage was applied. However, as shown in Fig. 7, the discharge starts from the beginning to the sustain electrodes SUS1 to SUSn. The rectangular pulse voltage of the potential Vru (V) exceeding the voltage may be applied.

As can be clearly seen from the above description, according to the plasma display device according to the present invention, the waveform of the drive voltage outputted by the drive unit is a slope waveform voltage having a different polarity from the sustain pulse voltage. It has a removal period applied to an electrode different from the applied electrode, thereby eliminating unnecessary residual charge remaining in the vicinity between adjacent discharge cells that cause erroneous discharge, and consequently, erroneous discharge is suppressed.

Therefore, a plasma display device capable of performing stable image display even in a highly accurate discharge cell structure can be obtained.

Claims (11)

A panel portion in which a substrate on which a plurality of pairs of scan electrodes and sustain electrodes are formed and a substrate on which data electrodes are formed orthogonal to the scan electrodes and the sustain electrodes are disposed to face each other; In the plasma display device having a driving unit for outputting a driving voltage for driving the panel unit, A write period for applying a write pulse voltage to the data electrode to cause a write discharge; After the writing period, a sustain pulse voltage for performing sustain discharge to the discharge cells to be displayed is alternately applied to the scan electrode and the sustain electrode, and a last sustain pulse voltage is applied among the scan electrode and the sustain electrode. The maintenance period to apply to either After the sustaining period has a removal period for continuously applying a ramp waveform voltage different in polarity from the sustaining pulse voltage, In the removal period, an inclination waveform voltage different in polarity from the sustain pulse voltage is applied to the scan electrode or the sustain electrode different from the electrode to which the last sustain pulse voltage is applied, and the write pulse voltage is applied to the data electrode. And a period for applying a voltage in the same polarity direction. The method of claim 1, The last sustain pulse voltage is positive, and the minimum voltage value Vnr (V) of the ramp waveform voltage in the removal period is the discharge start voltage value Vf1 () between the electrode and the data electrode which input the ramp waveform voltage. And (Vf1-60) &lt; = Vnr &lt; =-30, with respect to V)). delete delete delete delete delete delete The method of claim 1, The inclination of the inclined waveform voltage in the removal period is not less than 0.5V / mV and less than 20V / mV. delete delete

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