JP2000231361A - Driving method for plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the driving method of a plasma display panel capable of obtaining the stable drive without erroneous discharge and erroneous lights- out with a small number of pulses. SOLUTION: The drive is made possible with a small number of pulses by enabling obtaining priming effects of the same order in the case a front subfield 1 is lighting and in the case the field 1 is non-lighting while providing preliminary discharging pulses such as discharging with pulses respectively different with each other in both cases and while making them to be voltage values in accordance with respective wall electric charge amounts and, moreover, by facilitating the erasing of subsequent wall electric charges while making the potential of data electrodes in a preliminary discharging period 2 to be the intermediate potential between the potential of scanning electrodes and the potential of common electrodes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for driving a plasma display panel, and more particularly to a method for driving an AC discharge type plasma display panel.

[0002]

2. Description of the Related Art Generally, a plasma display panel (hereinafter abbreviated as "PDP") has many features such as being thin and capable of relatively easily displaying a large screen, having a wide viewing angle, and having a high response speed. have. For this reason, in recent years, it has been used as a flat display, such as a wall-mounted television or a public display board. PDP is
According to the operation method, the electrode is exposed to a discharge space (discharge gas) and operates in a DC discharge state.
Type) and an AC discharge type (AC type) in which an electrode is covered with a dielectric layer and is not directly exposed to a discharge gas and is operated in an AC discharge state.

[0003] In the DC type, discharge occurs during a period in which a voltage is applied. In the AC type, discharge is sustained by inverting the polarity of the voltage.

Further, the AC type includes a type having two electrodes in one cell and a type having three electrodes in one cell.

Here, the structure and driving method of a conventional three-electrode AC plasma display panel will be described. FIG. 7 is a view for explaining a configuration of a conventional plasma display panel, and is a view showing a cross section of a cell.

Referring to FIG. 7, an AC 3-electrode type plasma display panel comprises a front substrate 20 and a rear substrate 21 facing each other, a plurality of scanning electrodes 22 and a common electrode 23 disposed between the two substrates 20, 21. And data electrode 29, scan electrode 22, common electrode 23 and data electrode 2
And 9 display cells arranged in a matrix at each intersection.

A glass substrate or the like is used as the front substrate 20,
The scanning electrode 22 and the common electrode 23 are provided at a predetermined interval. On these, a transparent dielectric layer 24 and a protective layer 25 made of MgO or the like for protecting the transparent dielectric layer 24 from discharge are formed. A glass substrate or the like is used as the rear substrate 21, and the data electrodes 29 are provided so as to be orthogonal to the scanning electrodes 22 and the common electrodes 23. Further, a white dielectric layer 28 and a phosphor layer 27 are provided on the data electrode 29.

[0008] A partition wall is formed between these two glass substrates at a predetermined interval in parallel with the paper surface. The partition walls serve to secure the discharge space 26 and separate the pixels.

In the discharge space 26, a mixed gas of He, Ne, Xe or the like is sealed as a discharge gas. As such a conventional structure, for example, a document (Society for
Information display 98 digest,
279-281, May 1998 (SID 98 DIGEST, p.
279-281, May, 1998)).

FIG. 8 is a plan view of a conventional three-electrode AC type plasma display panel. Referring to FIG. 8, Si of scan electrode 22 and Ci of common electrode 23 (i = 1 to 1)
m) and Dj (j = 1 to n) of the data electrode 29, the display cells 31 are arranged in a matrix.

Next, a method of driving the PDP will be described.
At present, the mainstream driving method is a scanning sustaining separation method (referred to as “ADS method”) in which a scanning period and a sustaining period are separated. Hereinafter, the driving method of the scan maintaining and separating method will be described. FIG. 6 shows one subfield 1 of the three-electrode AC type plasma display panel (hereinafter referred to as “subfield 1”).
FIG. 5 is a diagram illustrating an example of a driving waveform of “SF”.

One subfield 1 includes a preliminary discharge period 2,
The scanning period is composed of three periods: a scanning period 3 and a sustaining period 4.

First, the preliminary discharge period 2 will be described.
The preliminary discharge pulse 12 is applied to the common electrode 23. This resets and initializes the difference in the state of formation of wall charges at the end of the previous SF due to the light emission state of the previous SF, and at the same time, forcibly discharges all pixels, and reduces the subsequent write discharge. Provides a priming effect to be triggered by voltage. Therefore, the pre-discharge pulse 12 must discharge a higher voltage than the scan pulse and the sustain pulse in order to discharge all the pixels.

In FIG. 6, the number of preliminary discharge pulses is one, but after applying a sustain erasure pulse for resetting the state of the previous SF, a priming pulse for discharging all pixels to cause a priming effect is applied. In some cases, the pulse is applied while separating the two roles. At this time, the sustain erase pulse is not limited to one time, and a different pulse may be applied plural times.

Further, the priming effect is not always required for every SF.
This is not necessary, and there is a driving method in which a priming pulse is applied only once every several SFs.

Since the priming pulse causes all pixels to emit light irrespective of the display, the luminance during black display can be reduced by reducing the number of times the priming pulse is applied.

When the pre-discharge pulse 12 is used as in the example shown in FIG. 6, the priming effect of forcibly discharging all the pixels is set to once every several SFs. In some cases, the preliminary discharge pulse 12 may be lowered to perform only the role of reset.

At this time, different pulses can be applied a plurality of times instead of the pre-discharge pulse in order to surely perform the reset.

Next, a preliminary discharge erasing pulse 7 is applied. Thereby, the wall charges on the dielectric formed by the preliminary discharge are erased or controlled to an appropriate amount.

In the example shown in FIG. 6, the pre-discharge erasing pulse is one time. However, a plurality of pre-discharge erasing pulses are used in order to reliably perform the role of the pulse, to suppress in-plane variation, and to cope with a change in display load. Or may be applied to other electrodes.

Next, a scanning period 3 starts. In scanning period 3,
The scanning pulse 8 is sequentially applied to the scanning electrodes 22 of S1 to Sm in FIG. The data pulse 9 is applied to the data electrodes 30 of D1 to Dn in FIG.

In the pixel to which the data pulse 9 is applied, a high voltage is applied between the scan electrode 22 and the data electrode 30, so that a write discharge occurs, and a large positive wall charge is applied to the scan electrode 22 side. Is formed, and negative wall charges are formed on the data electrode 30 side.

On the other hand, in the pixel to which the data pulse 9 is not applied, the applied voltage becomes low, so that no discharge occurs and the state of the wall charge does not change.

As described above, two types of wall charges can be created depending on the presence or absence of the data pulse 9. In FIG. 6, the oblique line of the data pulse 9 means that the presence or absence of the data pulse 9 changes depending on the display data.

When the application of the scanning pulse 8 to all the lines is completed, the operation proceeds to the sustain period 4. The sustain pulse 10 is alternately applied to all the scan electrodes 22 and all the common electrodes 23.

The voltage value of sustain pulse 10 is set to a voltage at which discharge does not start with its own voltage.

Therefore, since the wall charge is small in the pixel where no write discharge has occurred, no discharge occurs even if the sustain pulse is applied. On the other hand, in the pixel in which the write discharge has occurred, since a large positive wall charge exists on the scan electrode 22 side, the first negative sustain pulse applied to the common electrode 23 (referred to as “first sustain pulse”) Positive wall charges are superimposed, a voltage higher than the discharge starting voltage is applied to the discharge space,
Sustain discharge occurs.

Due to the sustain discharge, negative wall charges are accumulated on the scan electrode 22 side, and positive wall charges are accumulated on the common electrode 23 side.

The next sustain pulse (referred to as "second sustain pulse") is applied to the scanning electrode 22 side, and the above-mentioned wall charges are superimposed, so that a sustain discharge is also generated here, and is opposite to the first sustain pulse. Is accumulated on the scanning electrode 22 side and the common electrode 23 side.

Thereafter, discharge is continuously generated according to the same principle. That is, the potential difference due to the wall charges generated by the x-th sustain discharge is superimposed on the (x + 1) -th sustain pulse, and the sustain discharge is maintained. The amount of light emission is determined by the number of times of sustain discharge.

The above-described sustain erase period 2, scan period 3, and sustain period 4 are collectively called a "subfield". In the case of performing the gradation display, 1 which is a period for displaying image information of one screen.
A field is made up of these multiple sub-feeds. The gradation display can be performed by changing the number of sustain pulses in each subfield and lighting or not lighting each subfield.

[0032]

However, in the method in which the pre-discharge pulse 12 is applied once in the pre-discharge period 2 to perform the reset and the priming effect at the same time as in the above-mentioned conventional driving method, the prior SF is used. The voltage applied to the discharge space when the preliminary discharge pulse 12 is applied differs depending on the state of formation of the wall charges. That is, a voltage obtained by superimposing the wall charge voltage on the applied pulse voltage is applied to the discharge space, and the amount of wall charge formed differs depending on the lighting / non-lighting state of the previous SF. At the time of application, different voltages are applied to the discharge space depending on the state of the previous SF. The magnitude of the priming effect varies depending on the voltage applied to the discharge space, and the discharge starting voltage of the subsequent write discharge varies.

For this reason, a problem that a pixel which should not be lit is liable to be lit or a pixel which should be lit is liable to be erroneously turned off depending on whether the previous SF is lit or not lit. There is a point.

On the other hand, when the sustaining erase pulse and the priming pulse are used in the pre-discharge period 2, since the priming pulse is applied after resetting once by the sustaining erase pulse, the erroneous lighting or erroneous lighting as described above is performed. Lighting out is unlikely to occur.

In this case, however, the pre-discharge period 2
Therefore, if the period of one subfield 1 is fixed, the sustain period 4 must be shortened. And
When the maintenance period 4 is shortened, there is a problem that the luminance is reduced and the image quality is reduced. Incidentally, for example, Japanese Patent Laid-Open No. 6-43
No. 829 discloses an address period in which display data is written in the entire screen by forming wall charges necessary for sustain discharge in accordance with the display data, and a sustain period in which sustain discharge for emitting light is repeated. A driving method for driving the plasma display by separating the driving and driving the plasma display, and driving the sequential driving for forming wall charges according to the display data in the sustain period by skipping one line at a time, thereby increasing the luminance and performing stable driving. Has been proposed.

Accordingly, the present invention has been made in view of the above problems, and has as its object to surely reset the state of the previous subfield during a short preliminary discharge period, so that the previous subfield is lit. It is an object of the present invention to provide a method of driving a plasma display panel that can obtain the same priming effect regardless of whether it is turned on or not, and make it possible to equalize the discharge start voltage of the subsequent write discharge.

[0037]

According to the present invention, there is provided a method for driving an AC type plasma display panel, comprising the steps of: providing a wall charge on a dielectric layer on a plurality of electrodes in pixels arranged in a matrix; A scanning period in which write discharges are sequentially performed to form a discharge based on a display signal, a sustain period in which discharge is performed to light based on the wall charges formed in the scan period, and a discharge in the sustain period. An AC-type plasma display panel having a preliminary discharge period for resetting the state of formation of wall charges which differs depending on whether or not the discharge has occurred, and performing a discharge for lowering the discharge start voltage of the write discharge in the next scanning period A first preliminary discharge pulse that causes a discharge only when a discharge occurs in the sustain period immediately before the preliminary discharge period; And a second pre-discharge pulse that causes a discharge only when no discharge is generated in the sustain period immediately before, during the pre-discharge period, is applied between the electrodes. . The above object can be achieved by any one of the second to tenth aspects of the present invention.

[0038]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments and examples of the present invention will be described below. First, the principle and operation of the present invention will be described.

As a result of intensive studies, the present inventors have found that in order to solve the above-mentioned problem, the sustain erase pulse is eliminated,
Instead, the discharge state during the sustain period of the previous SF, that is,
By applying two types of pulses in consideration of the amount of wall charges formed at the end of the sustain period of the previous SF, the sustained erase of the previous SF is performed with each of the two types of pulses, and both are approximately the same. Has come to know a driving method of giving an appropriate priming effect.

Further, in the case of a three-electrode AC type plasma display, when different large wall charges are formed on three electrodes, it is difficult to eliminate all wall charges by one pulse application.

Therefore, in the present invention, the wall charges on the data electrode are set to near zero at the same time as applying the above two types of pulses, thereby facilitating the erasure of the wall charges thereafter.

That is, in the driving method of the AC type plasma display panel according to the present invention, the wall charges are formed on the dielectric layer on the plurality of electrodes in the pixels arranged in a matrix on the basis of the display signal. Scanning period (3 in FIG. 1) in which write discharge is sequentially performed, a sustain period (4 in FIG. 1) in which discharge for lighting is performed based on the wall charges formed in the scanning period, and the sustain period. A pre-discharge period (2 in FIG. 1) in which the state of formation of wall charges, which differs depending on whether or not a discharge is generated, is reset, and a discharge for lowering the discharge start voltage of the write discharge in the next scanning period is performed. And 1
In the driving method included in the subfield (1 in FIG. 1),
In the sustain period (4) immediately before the pre-discharge period, a first pre-discharge pulse (5 in FIG. 1) that causes discharge only when a discharge is occurring, Second pre-discharge pulse (6 in FIG. 1) that causes a discharge only when no discharge occurs during sustain period (4).
Is applied between the scan electrode and the common electrode during the preliminary discharge period (2 in FIG. 1).

In the present invention, preferably, in order to keep the pulse voltage low, it is preferable that (a) the electrode (for example, a scanning electrode and a common electrode) to which the first preliminary discharge pulse (5 in FIG. 1) is applied. The potential difference is smaller than the potential difference between the electrodes (for example, the scanning electrode and the common electrode) when the second preliminary discharge pulse (6 in FIG. 1) is applied, or (b) or the same preliminary discharge period Wherein the first pre-discharge pulse (5 in FIG. 1) is applied before the second pre-discharge pulse (6 in FIG. 1), or (c) or the first pre-discharge pulse The discharge pulse (5 in FIG. 1) and the second pre-discharge pulse (6 in FIG. 1) correspond to the sustain period (4 in FIG. 1).
A sustain pulse (10 in FIG. 1) is applied between the electrodes to which the sustain pulse is applied to maintain the light emission of the display, and the potential difference between the electrodes when the sustain pulse is applied is opposite to that when the sustain pulse is applied. Make it polar. At this time, preferably, the potential difference between the electrodes when the first pre-discharge pulse is applied is smaller than the potential difference between the electrodes when the second pre-discharge pulse is applied, only the sustain pulse voltage. By lowering the intensity, the first preliminary discharge and the second preliminary discharge can have the same intensity, and the priming effect can be equalized.

Further, in the AC type plasma display panel, a scanning electrode (22 in FIGS. 7 and 8) and a common electrode (23 in FIGS. 7 and 8) are provided on one substrate, and the scanning electrode is provided on the other substrate. And a data electrode (29 in FIGS. 7 and 8) provided so as to intersect with the common electrode. The driving method of the present invention is applied to the three-electrode plasma display panel. In this case, both the voltage of the first pre-discharge pulse and the voltage of the second pre-discharge pulse are applied between the scan electrode and the common electrode, so that the previous sub-field (S
The wall charge generated by the sustain pulse of F) can be reduced to an appropriate amount by the first preliminary discharge pulse.

At this time, preferably, during the period in which the first preliminary discharge pulse and the second preliminary discharge pulse are applied, the potential of the data electrode is changed to the potential of the scan electrode and the potential of the common electrode. By setting the interval, the wall charge amount on the data electrode can be reduced.

Further, in the present invention, preferably,
By making the potential difference between the scanning electrode and the data electrode half of the potential difference between the scanning electrode and the common electrode, the amount of wall charges on the data electrode can be made substantially zero. According to such a driving method, the subsequent wall charges on the other electrodes are easily erased, so that the erase can be performed with a small number of pulses.

Further, preferably, the potential of the data electrode is one of two types of potentials applied to the data electrode based on display data of lighting and non-lighting during the scanning period. It is not necessary to newly provide a setting voltage for the data driver, and it is possible to suppress an increase in cost.

Preferably, when the potential of the data electrode is grounded, the voltage of the first preliminary discharge pulse and the voltage of the second preliminary discharge pulse can be reduced.

As described above, when the wall charges on the electrodes other than the electrodes to which the first preliminary discharge pulse and the second preliminary discharge pulse are applied are substantially zero, the first preliminary discharge pulse and the second preliminary discharge pulse After applying the preliminary discharge pulse, only the wall charges on the scan electrode and the common electrode need to be erased.
To achieve this, a round pulse (7 in FIG. 1) or a triangular pulse (7 in FIG. 2) in which the voltage gradually changes with time is applied to the first preliminary discharge pulse and the second preliminary discharge pulse. When the discharge pulse is applied, the potential difference generated between the electrodes to which the first preliminary discharge pulse and the second preliminary discharge pulse are applied has a potential difference opposite in polarity to that at the end of the round pulse or the triangular pulse. To Hereinafter, a detailed description will be given in accordance with various embodiments.

[0050]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

[Embodiment 1] FIG. 1 is a waveform diagram for explaining a first embodiment of the present invention, and shows a driving waveform of one scanning-separated sub-field of a three-electrode AC type plasma display. FIG. The plasma display panel in which the driving method of the present invention is implemented has the same panel structure and cell structure as those of the conventional one, and has, for example, the configuration shown in FIGS. 7 and 8. In the description of one embodiment of the present invention, the scanning electrode 2
2, FIG. 7 and FIG. 8 are appropriately referred to for the common electrode 23, the data electrode 29, and the like.

In FIG. 1, scanning period 3 and sustain period 4
Is the same as the conventional drive waveform described with reference to FIG. The voltage of the scanning pulse 8 is set to about -180 to -200 V, and the pulse width is set to 2 to 3 microseconds ([mu] sec).

The voltage (amplitude) of the data pulse 9 is 80 to 9
The pulse width is set to about 0 V and the pulse width is set to 3 to 4 microseconds. Sustain pulse 10 is set at about -160 to -180V.

Next, the pre-discharge period 2 which characterizes the present invention is described.
Will be described. The last sustain pulse in the sustain period 4 is applied to the scan electrode 22. On the other hand, both the first preliminary discharge pulse 5 and the second preliminary discharge pulse 6 are configured by applying a positive pulse to the scan electrode 22 and a negative pulse of the same voltage to the common electrode 23. I have.

That is, the potential difference between the scanning electrode 22 and the common electrode 23 is set to have a polarity opposite to that of the last sustain pulse in the sustain period 4.

The voltage value of the first pre-discharge pulse 5 is set to 80 to 90 V which is about half of the sustain pulse 10. The voltage value of the second preliminary discharge pulse 6 is approximately the same as that of the sustain pulse 10, and is set to 160 to 180V. The first pre-discharge pulse 5 and the second pre-discharge pulse 6 are applied continuously, and both have a pulse width of 3 to 5 microseconds.

While the first and second pre-discharge pulses 5 and 6 are being applied, the potential of the data electrode 29 is kept at the ground potential.

Next, after all the electrodes are once grounded, the pre-discharge erase pulse 7 is applied to the scanning electrodes 22.

In the present embodiment, a rounding pulse whose waveform is blunted using a capacitance and a resistance is used as the preliminary discharge erasing pulse 7. The pulse width is 80 to 150 microseconds, and the final voltage value is -180 to -210V.

Next, the operation at this time will be described.
First, a case where the previous SF (subfield) is not lit will be described. In this case, since no discharge has occurred since the preliminary discharge period 2 of the previous SF, almost no wall charge is formed. In this state, when the first pre-discharge pulse 5 is applied, the potential difference between the scan electrode 22 and the common electrode 23 is 160 to the potential difference of the first pre-discharge pulse because there is almost no wall charge. It becomes 180V.

The discharge starting voltage of this panel was found to be around 200 V, depending on the data electrode potential, and no discharge occurred at the above potential difference.

Next, the second preliminary discharge pulse 6
Is applied. At this time, the scanning electrode 22 and the common electrode 23
During this period, a voltage of about 320 to 360 V is applied, and a strong discharge occurs.

As a result, charged particles increase in the cell,
The discharge starting voltage in the subsequent scanning period can be reduced. At this time, the potential of the data electrode 29 is
The potential of the common electrode 23 is grounded so as to be exactly intermediate between the potentials of the common electrode 23 and the common electrode 23.

As a result, the data electrode 29 is also left on the data electrode 29 due to the opposing discharge between the scan electrode 22 or the common electrode 23 and the data electrode 29 and the adsorption of charged particles due to the surface discharge between the scan electrode 22 and the common electrode 23. Almost no wall charge is formed. This means that in the subsequent preliminary discharge erasing pulse 7, only the wall charges on the scan electrode 22 and the common electrode 23 need to be erased, and the erasure becomes easy, and it is not necessary to apply many pulses. be able to.

On the other hand, due to this discharge, a large negative wall charge is formed on the scan electrode 22 side and a large positive wall charge is formed on the common electrode 23 side.
The wall charges generate a potential difference of the opposite polarity between the electrodes when the second pre-discharge pulse 6 falls, thereby causing a self-erasing discharge, whereby a certain amount of wall charges can be eliminated.

In order to further reduce the wall charge,
A predischarge erase pulse 7 is applied.

In the present embodiment, as the preliminary discharge erasing pulse 7, a rising pulse is slowed down and a blunt pulse whose voltage gradually rises is used. The amount gradually decreased so that it became almost zero at the end of the pulse.

Next, the case where the previous SF is turned on will be described. Since the last sustain pulse 10 (referred to as the last sustain pulse) in the sustain period 4 of the previous SF has a negative pulse applied to the scan electrode 22, the last sustain pulse discharges the positive sustain wall 10 on the scan electrode 22. An electric charge and a negative wall electric charge are formed on the common electrode 23.

Since the potential of the data electrode 29 is set to the ground potential, it is considered that negative wall charges are formed on the data electrode 29. It is considered that a potential difference of about 160 to 180 V is generated in the transparent dielectric layer 24 on the scan electrode 22 and the common electrode 23 by the wall charges.

In this state, when the first preliminary discharge pulse 5 is applied, the potential difference between the scan electrode 22 and the common electrode 23 becomes
The potential difference between the first preliminary discharge pulse and the transparent dielectric layer 2
320 to 360 in which the potential difference applied to 4 is superimposed
It is considered that the voltage is about V.

Therefore, a voltage substantially equal to that when the previous SF is not lit is applied, and the same priming effect can be obtained regardless of whether the previous SF is lit or not lit. Thereby, the discharge start voltage during the scanning period can be made uniform,
Erroneous write discharges such as erroneous lights and erroneous lights are no longer generated.

Further, at the time of this discharge, the data electrode 29
Is set as the ground potential so that the potential is exactly intermediate between the potentials of the scanning electrode 22 and the common electrode 23.

As in the case where the previous SF is not lit, this makes it easier to erase the subsequent pre-discharge erase pulse 7, and it is not necessary to apply many pulses.

As described above, according to the present embodiment, the wall charge state of the previous SF can be reliably reset with a small number of pulses.
At the same time, the same priming effect was obtained irrespective of the lighting state of the previous SF, the occurrence of erroneous lighting and erroneous extinction was eliminated, and stable driving was achieved.

In the above-described embodiment, the case where the last sustain pulse is a negative pulse on the scan electrode 22 side has been described. By switching the drive waveforms applied to the scan electrode 22 and the common electrode 23 during the pre-discharge period 2, a drive with the same effect can be obtained. The same can be said for the other embodiments described below.

[Second Embodiment] A second embodiment of the present invention will be described with reference to FIG. The panel structure and the cell structure are the same as those of the first embodiment.

This embodiment is the same as the first embodiment except that the waveform of the pre-discharge erase pulse 7 is a triangular pulse (sawtooth wave).

By using a triangular pulse, there is no steep rising portion of the voltage at the beginning of the round pulse, and erroneous discharge there can be eliminated.

[Embodiment 3] A third embodiment of the present invention will be described with reference to FIG. The panel structure and the cell structure are the same as those of the first embodiment.

In FIG. 3, scanning period 3 and sustain period 4
Is the same as the conventional drive waveform shown in FIG. The voltage of the scanning pulse 8 was set to about -180 to -200 V, and the pulse width was set to 2 to 3 microseconds.

The voltage of the data pulse 9 was set to about 70 to 90 V, and the pulse width was set to 3 to 4 μm. The sustain pulse 10 was set at about -160 to -180V.

Next, the preliminary discharge period 2 will be described.
The last sustain pulse in the sustain period 4 is applied to the scan electrode 22. On the other hand, in the first preliminary discharge pulse 5, a positive pulse is applied to the scan electrode 22, and in the second preliminary discharge pulse 6,
It is configured by applying a positive pulse to the scanning electrode 22 and a negative pulse of the same voltage to the common electrode 23.

That is, the potential difference between the scanning electrode 22 and the common electrode 23 is set to have a polarity opposite to that when the final sustain pulse is applied. The voltage value of the first preliminary discharge pulse was set to 160 to 180 V, which is almost the same as that of the sustain pulse 10. The voltage value of the second preliminary discharge pulse is set to be approximately equal to that of the sustain pulse 10,
A pulse of 160-180 V was applied between both electrodes. The first pre-discharge pulse 5 and the second pre-discharge pulse were continuously applied, and both had a pulse width of 3 to 5 microseconds.

During the period in which the first preliminary discharge pulse 5 was applied, a data bias pulse having the same voltage value as the data pulse 9 was applied to the data electrode 29.

Next, after all the electrodes are once grounded, the preliminary discharge erasing pulse 7 is applied to the scanning electrodes 22. In the present embodiment, a rounding pulse whose waveform is blunted using a capacitance and a resistance is used as the preliminary discharge erasing pulse 7.

The pulse width is set to 80 to 150 microseconds.
The final voltage value was -180 to -210V. In FIG.
Although the preliminary discharge erasing pulse 7 is a round pulse, a similar effect can be obtained by applying a triangular pulse as in the second embodiment of the present invention.

[Fourth Embodiment] A fourth embodiment of the present invention will be described in detail with reference to FIG.
The panel structure and the cell structure are the same as those of the first embodiment.

In FIG. 4, scanning period 3 and sustain period 4
Is the same as the conventional drive waveform shown in FIG. The voltage of the scanning pulse 8 was set to about -180 to -200 V, and the pulse width was set to 2 to 3 microseconds. The voltage of the data pulse 9 was set to about 70 to 90 V, and the pulse width was set to 3 to 4 microseconds. The sustain pulse 10 was set at about -160 to -180V.

Next, the preliminary discharge period 2 will be described.
The last sustain pulse in the sustain period 4 is applied to the scan electrode 22. On the other hand, both the first preliminary discharge pulse 5 and the second preliminary discharge pulse 6 are configured by applying a positive pulse to the scan electrode 22 and applying a negative pulse of the same voltage to the common electrode 23. I have.

That is, the potential difference between the scanning electrode 22 and the common electrode 23 is set to have a polarity opposite to that when the final sustain pulse is applied. The first pre-discharge pulse is constituted by applying a pulse of about 80 to 90 V about half of the sustain pulse 10 between both electrodes, and the second pre-discharge pulse is the same as the first pre-discharge pulse. A voltage pulse is applied to the common electrode 23, and at the same time, about 2/3 of the sustain pulse 10
It is constituted by applying a pulse of 0 to 270 V. In each case, the pulse width was 3 to 5 microseconds.
During the period in which the second preliminary discharge pulse 6 was applied, a data bias pulse having the same voltage value as the data pulse 9 was applied to the data electrode 29.

Next, after all the electrodes are once grounded, the preliminary discharge erasing pulse 7 is applied to the scanning electrodes 22. In the present embodiment, a rounding pulse whose waveform is blunted using a capacitance and a resistance is used as the preliminary discharge erasing pulse 7. The pulse width is 8
0 to 150 microseconds, and the final voltage value is -180 to-
210V.

In FIG. 4, the preliminary discharge erasing pulse 7 is a round pulse, but similar effects can be obtained by applying a triangular pulse, as in the second embodiment of the present invention.

[Fifth Embodiment] A fifth embodiment of the present invention will be described in detail with reference to FIG. The panel structure and the cell structure are the same as those of the first embodiment.

In FIG. 5, scanning period 3 and sustain period 4
Is the same as the conventional drive waveform shown in FIG. The voltage of the scanning pulse 8 was set to about -180 to -200 V, and the pulse width was set to 2 to 3 microseconds. The voltage of the data pulse 9 was set to about 70 to 90 V, and the pulse width was set to 3 to 4 microseconds. The sustain pulse 10 was set at about -160 to -180V.

Next, the preliminary discharge period 2 will be described.
The last sustain pulse in the sustain period 4 is applied to the scan electrode 22. On the other hand, in the first preliminary discharge pulse 5, a positive pulse is applied to the scan electrode 22, and in the second preliminary discharge pulse 6,
It is configured by applying a positive pulse to the scanning electrode 22 and a negative pulse of the same voltage to the common electrode 23.

That is, the potential difference between the scanning electrode 22 and the common electrode 23 is set to have the opposite polarity to that when the final sustain pulse is applied. The voltage value of the first pre-discharge pulse 5 was set to 160 to 180 V, which is almost the same as that of the sustain pulse 10. The second preliminary discharge pulse 6 includes a pulse of 240 V to 270 V, which is about 3/2 of the sustain pulse 10 applied to the scan electrode 22,
About -1/2 of the sustain pulse 10 applied to the common electrode
It is constituted by a pulse of 80 to -90V.

The first pre-discharge pulse 5 and the second pre-discharge pulse 6 are continuously applied, and both have a pulse width of 3 to 5.
Microseconds. During the period in which the first preliminary discharge pulse 5 was applied, a data bias pulse having the same voltage value as the data pulse 9 was applied to the data electrode.

Next, after all the electrodes are once grounded, the preliminary discharge erasing pulse 7 is applied to the scanning electrodes 22. In the present embodiment, a rounding pulse whose waveform is blunted using a capacitance and a resistance is used as the preliminary discharge erasing pulse 7. The pulse width is 80 to 150 microseconds, and the final voltage value is -180.
-210 V.

In the eleventh example of the waveform shown in FIG. 5, the preliminary discharge erasing pulse 7 is a round pulse. However, similar to the second embodiment of the present invention, the same effect can be obtained by applying a triangular pulse. Can be

[0100]

As described above, according to the present invention,
Without providing the sustain erasing pulse, the same priming effect can be obtained regardless of whether the previous SF is turned on or off.

Further, according to the present invention, it is possible to easily erase the wall charges after the preliminary discharge, and to obtain a stable drive with a small number of pulses without erroneous discharge or erroneous turn-off.

[Brief description of the drawings]

FIG. 1 is a diagram showing a driving waveform of one subfield in a first embodiment of the present invention.

FIG. 2 is a diagram showing a driving waveform of one subfield in a second embodiment of the present invention.

FIG. 3 is a diagram showing a driving waveform of one subfield in a third embodiment of the present invention.

FIG. 4 is a diagram showing a driving waveform of one sub-field in a fourth embodiment of the present invention.

FIG. 5 is a diagram showing a driving waveform of one subfield in a fifth embodiment of the present invention.

FIG. 6 is a diagram showing a driving waveform of one subfield of a conventional three-electrode AC plasma display panel.

FIG. 7 is a diagram showing a cell cross section of a three-electrode AC type plasma display panel.

FIG. 8 is a plan view of a three-electrode AC type plasma display panel.

[Explanation of symbols]

 Reference Signs List 1 1 subfield 2 preliminary discharge period 3 scan period 4 sustain period 5 first preliminary discharge pulse 6 second preliminary discharge pulse 7 preliminary discharge erase pulse 8 scan pulse 9 data pulse 10 sustain pulse 11 data bias pulse 12 preliminary discharge pulse REFERENCE SIGNS LIST 20 upper insulating substrate 21 lower insulating substrate 22 scan electrode 23 sustain electrode 24 transparent dielectric layer 25 protective layer 26 discharge space cell 27 phosphor layer 28 white dielectric layer 29 data electrode 30 display screen 31 1 cell

Claims (17)

[Claims] A scanning period for sequentially performing a writing discharge for forming a wall charge based on a display signal on a dielectric layer on a plurality of electrodes in pixels arranged in a matrix; Resetting a sustaining period for performing a discharge for lighting based on the wall charges formed on the wall, and a state of forming wall charges that differ depending on whether or not a discharge occurs during the sustaining period, A method for driving an AC plasma display panel having a preliminary discharge period for performing a discharge for lowering a discharge start voltage of a write discharge, wherein a discharge occurs in the sustain period immediately before the preliminary discharge period. A first pre-discharge pulse that causes a discharge only in the first pre-discharge pulse; and a second pre-discharge pulse that causes a discharge only when no discharge occurs in the sustain period immediately before the pre-discharge period. If the in the preliminary discharge period is applied between the electrodes, AC-type plasma display panel driving method which is characterized in that. 2. The method according to claim 1, wherein a potential difference between the electrodes to which the first pre-discharge pulse is applied is smaller than a potential difference between the electrodes to which the second pre-discharge pulse is applied. The driving method of the plasma display panel described in the above. 3. The method according to claim 1, wherein during the same preliminary discharge period, the first preliminary discharge pulse is applied earlier than the second preliminary discharge pulse. Driving method of a plasma display panel. 4. The method according to claim 1, wherein the first pre-discharge pulse and the second pre-discharge pulse are applied between the same electrodes to which a sustain pulse applied for sustaining light emission of display during the sustain period is applied. Applied, so that the potential difference between the electrodes when the sustain pulse is applied and the electrodes have opposite polarities,
4. The method of driving a plasma display panel according to claim 1, wherein: 5. A potential difference between the electrodes when the first preliminary discharge pulse is applied is lower than a potential difference between the electrodes when the second preliminary discharge pulse is applied by the sustain pulse voltage. The method of driving a plasma display panel according to claim 4, wherein: 6. The scanning sustaining separation drive in which the preliminary discharge period, the scanning period, and the sustaining period are identical in driving all the pixels. A method for driving a plasma display panel according to any one of the preceding claims. 7. The AC plasma display panel according to claim 1, wherein a scanning electrode and a common electrode are provided on one substrate, and a data electrode is provided on the other substrate so as to intersect the scanning electrode and the common electrode. 7. The method of driving a plasma display panel according to claim 1, wherein the method is a three-electrode type plasma display panel. 8. The voltage of the first pre-discharge pulse and the voltage of the second pre-discharge pulse are both applied between the scan electrode and the common electrode.
3. The method for driving a plasma display panel according to item 1. 9. A potential of the data electrode is between a potential of the scan electrode and a potential of the common electrode during a period in which the first preliminary discharge pulse and the second preliminary discharge pulse are applied. The method of driving a plasma display panel according to claim 8, wherein: 10. The driving method of a plasma display panel according to claim 9, wherein a potential difference between said scan electrode and said data electrode is の of a potential difference between said scan electrode and said common electrode. 11. The data electrode according to claim 1, wherein the potential of the data electrode is one of two types of potential applied to the data electrode based on display data of lighting and non-lighting during the scanning period. The method for driving a plasma display according to 9 or 10. 12. The method according to claim 6, wherein the potential of the data electrode is grounded. 13. Applying a round pulse or a triangular pulse whose voltage gradually changes with time during the preliminary discharge period after applying the first preliminary discharge pulse and the second preliminary discharge pulse, When the first pre-discharge pulse and the second pre-discharge pulse are applied, a potential difference having a polarity opposite to a potential difference generated between the electrodes to which the first pre-discharge pulse and the second pre-discharge pulse are applied. The method according to any one of claims 1 to 12, further comprising the step of ending the round pulse or the triangular pulse. 14. A method of resetting the formation state of wall charges which differs depending on whether or not a discharge is generated during a sustain period, and performing a discharge for lowering a discharge starting voltage of a write discharge in a next scanning period. Scanning for sequentially performing a preliminary discharge period to be performed and (b) writing discharge for forming a wall charge on a dielectric layer on a plurality of electrodes provided in pixels arranged in a matrix based on a display signal. In a method for driving an AC-type plasma display panel, wherein a sub-field includes a period and (c) a sustain period in which a discharge for lighting based on the wall charges formed in the scanning period is performed in one sub-field. By providing two types of pre-discharge pulses in the pre-discharge period so as to discharge with different pulses in the case of lighting and the case of non-lighting, and by setting the voltage value according to each wall charge amount, A driving method for a plasma display panel, wherein the same priming effect can be obtained regardless of whether the previous subfield is lit or not. 15. The two types of pre-discharge pulses are both applied to a scan electrode and a common electrode. At this time, the potential difference between the scan electrode and the common electrode has a polarity opposite to that of the last sustain pulse in the sustain period when applied. The driving method of a plasma display according to claim 14, wherein the potential of the data electrode is set to the ground potential while the two types of preliminary discharge pulses are applied. 16. The driving method of a plasma display panel according to claim 14, wherein the potential of the data electrode during the preliminary discharge period is set to an intermediate potential between the scanning electrode and the common electrode. 17. After the application of the two types of pre-discharge pulses, a pre-discharge erasing pulse composed of a pulse having a reduced waveform or a triangular pulse is applied to the scan electrode during the pre-discharge period. 16. The method of driving a plasma display according to claim 15, wherein the amount of wall charges is made substantially zero in the step (c).