JP2003263127A - Plasma display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display device capable of performing stable operation by suppressing erroneous discharges across adjacent cells generated owing to making high definition. <P>SOLUTION: The waveform of a driving voltage outputted from a driving part of the plasma display device comprises a sustaining period for alternately applying sustaining pulse voltage for sustaining the discharge to scanning electrodes and sustaining electrodes, and a removal period for applying sloping waveform voltage differing in polarity from the sustaining pulse voltage to an electrode different from the one to which the last sustaining pulse voltage is applied. This arrangement suppresses erroneous discharges, and makes it possible to obtain the plasma display device capable of stably displaying an image. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a large screen, thin type,
The present invention relates to a plasma display device known as a lightweight display device.

[0002]

2. Description of the Related Art In a plasma display device, ultraviolet rays are generated by a gas discharge, and the ultraviolet rays excite phosphors to emit light, thereby performing color display.

Plasma display devices are roughly classified into AC type and DC type in terms of driving, and there are two types of discharge types: surface discharge type and counter discharge type. High definition, large screen and structure. Due to the simplicity of manufacturing due to the simplicity of the above, at present, a surface discharge type plasma display device having a three-electrode structure is predominant. FIG. 7 shows a general structure of the panel portion of this plasma display device.

On a transparent and insulating substrate 1 such as glass, scan electrodes 2 and sustain electrodes 3 are arranged in pairs at a distance MG (hereinafter referred to as a main discharge gap MG). The scanning electrode 2 and the sustaining electrode 3 forming a pair have a distance IPG (hereinafter, referred to as a gap IPG between adjacent discharge cells).
Are arranged apart from each other. Dielectric layer 4 and protective film 5 are provided so as to cover scan electrode 2 and sustain electrode 3. Further, a plurality of data electrodes 7 are provided on an insulating substrate 6 such as glass, and a dielectric layer 8 is provided so as to cover the data electrodes 7. And the data electrode 7
Partition walls 9 are provided in parallel with the data electrodes 8 on the dielectric layer 8 between them. A phosphor 10 is provided on the surface of the dielectric layer 8 and the side surface of the partition wall 9. Then, the substrate 1 and the substrate 6 are arranged to face each other so that the scan electrodes 2 and the sustain electrodes 3 and the data electrodes 7 are orthogonal to each other, and the pair of scan electrodes 2 and the sustain electrodes 3 intersect the data electrodes 7. Becomes the discharge cell 11. The discharge cell 11 is filled with at least one of helium, neon, and argon and xenon as a discharge gas.

FIG. 8 shows a schematic structure of a driving section for outputting a driving voltage for driving the panel section shown in FIG. 7 and a connection state with each electrode of the panel section. The electrodes of the panel section are arranged in an m × n matrix, the data electrodes 7 for addressing are arranged in m columns in the column direction, and the scanning electrodes 2 for maintaining discharge in the row direction. And sustain electrode 3
Are paired and arranged in n columns.

The drive unit is a data write drive circuit 12
A scan drive circuit 13, an initialization circuit 14, and a sustain drive circuit 15. Data write drive circuit 12
Is a circuit for outputting a drive voltage to the data electrode 7, and is connected to each of the data electrodes 7 by m output terminals. The scan drive circuit 13 is a circuit for outputting a drive voltage to the scan electrodes 2, and is connected to each scan electrode 2 by n output terminals. The sustain drive circuit 15 is a circuit that outputs a drive voltage to the sustain electrodes 3 and is commonly connected to the sustain electrodes 3. The initialization circuit 14 is a circuit for performing an initialization operation, which is a driving operation for accumulating the initial charge in each electrode in which no charge is accumulated before energization.

FIG. 9 shows the waveform of the drive voltage output by this drive section. The waveform of the drive voltage shown in FIG. 9 shows an initialization period for accumulating initial charges in each electrode in which there is no charge accumulation before energization, and one field period after that.

One field period is a waveform for displaying one screen, and is composed of a plurality of first to eighth subfields, for example. One subfield is composed of a wall voltage adjustment period, a writing period, a sustaining period and an erasing period. The operation in each of these periods will be described below.

First, the operation during the initialization period will be described. In this initialization period, first, all the data electrodes D1 to Dm and all the scan electrodes SCN1 to SCNn are held at 0 (V), and all the sustain electrodes SUS1 to SUSn are scanned from 0 (V). A potential Vru (V) that exceeds the discharge start voltage after rapidly rising to a potential Vpu (V) that is less than or equal to the discharge start voltage with respect to the electrodes SCN1 to SCNn
A drive voltage having a positive waveform that gradually rises to is applied. In this gradual rising process, in each discharge cell 11, all the sustain electrodes SUS1 to SUSn to all the data electrodes D1 to Dm and all the scan electrodes SCN1 to SCn.
The first weak initializing discharge toward Nn occurs, a 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 scan electrode SCN1. A positive wall voltage is accumulated on the surface of the protective film 5 on the SCNn. Then, from this state, all the sustain electrodes SU are so gently as not to generate a discharge between the electrodes.
The potential of S1 to SUSn is decreased toward 0 (V).
With the above, the initialization operation in the initialization period is completed.

Next, the operation during the wall voltage adjustment period will be described. In this wall voltage adjustment period, all sustain electrodes SUS1 to SUSn and all data electrodes D1 to
Applying 0 (V) to Dn, all scan electrodes SCN1 to SC
A driving voltage having a positive waveform that gradually increases from 0 (V) to Vrc (V) is applied to Nn. In this gradual rising process, in all the discharge cells 11, all the sustain electrodes SUS1 to SUSn are negative and all the scan electrodes S are negative.
A weak discharge with CN1 to SCNn being positive occurs, and a positive wall voltage on the surface of the protective film 5 on all the scan electrodes SCN1 to SCNn and a negative wall voltage on the surface of the protective film 5 on the sustain electrodes SUSi are The wall voltage is once adjusted to a wall voltage suitable for the write operation in the write period performed after the wall voltage adjustment period. Then, further, 0 is applied to all the scan electrodes SCN1 to SCNn.
After (V) is applied, a drive voltage having a waveform that gradually decreases toward Vns (V) is applied, and all sustain electrodes SUS1 to SUSn are gradually increased from 0 (V) to Ve (V). A drive voltage having a waveform to be applied is applied. All of the sustain electrodes SUS1 to SUSn are applied when these driving voltages are applied.
A weak discharge occurs in which all the data electrodes D1 to Dm are positive and all the scan electrodes SCNi are negative, and the positive wall voltage on the surface of the phosphor 10 on all the data electrodes D1 to Dm and all the sustain electrodes SUS1. ~ The negative wall voltage on the surface of the protective film 5 on SUSn and the positive wall voltage on the surface of the protective film 5 on all the scan electrodes SCN1 to SCNn are suitable for the write operation in the write period performed after the wall voltage adjustment period. Adjusted to the wall voltage. With the above, the wall voltage adjustment period ends.

Next, the operation during 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 continuously applied to all the sustain electrodes SUS1 to SUSn. In addition, of the data electrodes D1 to Dm, a predetermined data electrode Dj corresponding to the discharge cell 11 to be displayed in the first row.
A writing pulse voltage having a positive potential Vw (V) is applied to (j represents an integer of 1 to m) and a potential Vad (V) having a negative polarity is applied to the scan electrode SCN1 in the first row. At this time, the predetermined data electrode Dj and scan electrode SCN1
The potential difference between the surface of the phosphor 10 and the surface of the protective film 5 on the scan electrode SCN1 at the intersection (first intersection) with is positive for the potential Vw of the data waveform on the surface of the phosphor 10 on the data electrode Dj. Since the negative wall voltage on the surface of the protective film 5 on the scan electrode SCN1 is subtracted from that to which the wall voltage is added (that is, the absolute value is added), at the first intersection,
A write discharge occurs between a predetermined data electrode Dj and scan electrode SCN1. At the same time, triggered by this writing discharge,
Sustain electrode SUS1 and scan electrode SCN1 at the first intersection
Write discharge also occurs between and, and a positive wall voltage is accumulated on the surface of the protective film 5 on the scan electrode SCN1 at the first intersection,
A negative wall voltage is accumulated on the surface of the protective film 5 on the sustain electrode SUS1 at the first intersection.

The same operation is continuously performed up to the n-th row, and the writing operation in the writing period ends.

Next, the operation during the sustain period will be described. During this sustain period, all scan electrodes SCN
By alternately applying the sustain waveform of the potential Vst (V) to 1 to SCNn and all the sustain electrodes SUS1 to SUSn,
The sustain discharge is continuously performed in the discharge cells 11 in which the write discharge has occurred. Visible light emission from the phosphor 10 excited by ultraviolet rays generated by this sustain discharge is used for display.

Here, the states of the wall voltage of the scan electrode SCNi and the sustain electrode SUSi of the discharge cell 11 in which the sustain discharge is continuously performed are as follows. First, the scan electrode SCNi
When Vst (V) is applied to the sustain electrode SUSi and 0 (V) is applied to the sustain electrode SUSi, a discharge is generated from the scan electrode SCNi toward the sustain electrode SUSi, and accordingly, a positive voltage is applied from the scan electrode SCNi toward the sustain electrode SUSi. Ions are the sustain electrodes SU
Electrons move from Si to scan electrode SCNi, and as a result, the wall voltage on the surface of protective film 5 on sustain electrode SUSi becomes positive and the wall voltage on the surface of protective film 5 on scan electrode SCNi becomes negative. Then, at the next moment, when the application of the sustain pulse voltage Vst (V) is switched and 0 (V) is applied to the scan electrode SCNi and Vh (V) is applied to the sustain electrode SUSi, the sustain electrode SUSi moves toward the scan electrode SCNi. Discharge occurs,
Correspondingly, similar migration of positive ions and electrons occurs, the wall voltage on the surface of the protective film 5 on the sustain electrode SUSi switches from positive to negative, and the wall voltage on the surface of the protective film 5 on the scan electrode SCNi switches from positive to negative. . After the above operation is repeated, Vst (V) is applied to the sustain electrode SUSi and the scan electrode SC
The sustain discharge ends with 0 (V) applied to Ni. At this time, the wall voltage on the surface of the protective film 5 on the sustain electrode SUSi is switched from positive to negative, and the wall voltage on the surface of the protective film 5 on the scan electrode SCNi is switched from negative to positive. The sustain period ends in the above state.

Next, the operation during the erase period will be described. In this erase period, all scan electrodes SCN
A drive voltage having a waveform that gradually rises from 0 (V) to the potential Vd (V) is applied to 1 to SCNn. In the discharge cell 11 that has generated the sustain discharge, a weak erase discharge is generated between the sustain electrode SUSi (i represents an integer of 1 to n) and the scan electrode SCNi in the process of the waveform gradually rising, and the scan electrode The positive wall voltage on the surface of the protective film 5 on the SCNi and the negative wall voltage on the surface of the protective film 5 on the sustain electrode SUSi are weakened, and the discharge is stopped. Thus, the erase operation in the erase period is completed.

Then, the operation in the sub-field period starting from the wall voltage adjustment period is repeated again to set 1
A field period is configured and an image is displayed.

[0017]

However, in the plasma display device provided with the panel portion and the driving portion described above, the discharge cell pitch is made smaller in the Y direction in the panel portion shown in FIG. 7 for the purpose of particularly high definition. In that case, there arises a problem that erroneous discharge occurs.

This cause is considered to be due to 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 should be a state in which the wall voltage is switched from negative to positive as described above. It is realized by the positive ions reaching the surface of the film 5. However, since the moving speed μion of the positive ions is much slower than the moving speed μe of the electrons, for example, switching can be easily performed in the vicinity of the main discharge gap MG where the moving distance of the positive ions is short. Scan electrode S that requires a long moving distance with respect to
There is a high probability that positive ions do not reach outside the CNi, that is, near the gap IPG between adjacent discharge cells, and as a result, negative charges 16 are present outside the scan electrode SCNi, that is, near the gap IPG between adjacent discharge cells. It remains in a state where it is not neutralized. This state is shown in FIG.
It shows in (a). FIG. 10 is a sectional view taken along the line ZZ in FIG. 7, and “+” and “−” indicate electric charges, but they are conceptual only and the number thereof is not strict.

When the negative charge 16 remains and the subsequent erase period and wall voltage adjusting period are performed,
Although the wall voltage is adjusted as described above, the unnecessary negative charge 16 remaining in the vicinity of the gap IPG between adjacent discharge cells remains.

In this state, when 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 Di by the write operation in the write period, the adjacent discharge cells are discharged. Gap I
A discharge 17 is generated between the unnecessary negative charge 16 remaining near the PG and the data electrode Di (see FIG. 10).
(B)), a large amount of priming effect particles (metastable atoms, ions, etc.) are simultaneously generated with the discharge 17.
Here, the place where the discharge 17 is generated is the adjacent discharge cell gap IP.
The priming effect particles generated from the vicinity of G easily flow into the adjacent discharge cells, which becomes remarkable when the pitch of the discharge cells 11 is narrow for high definition. In the Y direction shown in FIG. 7, there is nothing that physically restricts the discharge region as shown by the barrier ribs 9 in the X direction, so the priming effect particles mainly flow into the adjacent discharge cells in the Y direction, Since the priming effect particles that have flowed in change the wall voltage of the discharge cell 11, as a result, a problem of erroneous discharge such as erroneous writing in the Y direction or writing failure occurs.

The present invention has been made in view of the above situation, and an object thereof is to obtain a plasma display device capable of suppressing erroneous discharge and performing stable image display even with a high-definition discharge cell structure. .

[0022]

In a plasma display device of the present invention for achieving the above object, a substrate having scan electrodes and sustain electrodes formed in parallel with each other and a data electrode are orthogonal to the scan electrodes and the sustain electrodes. A plasma display device comprising: a panel unit having a substrate formed so as to face each other; and a drive unit outputting a drive voltage for driving the panel unit, wherein the waveform of the drive voltage maintains discharge. A sustain pulse voltage for alternately applying the sustain pulse voltage to the scan electrode and the sustain electrode, and a ramp waveform voltage having a polarity different from that of the sustain pulse voltage to an electrode different from the electrode to which the last sustain pulse voltage is applied. And a removal period to be applied.

In the plasma display device of the present invention to achieve the above object, a substrate having scan electrodes and sustain electrodes formed in parallel with each other and a data electrode are formed so as to be orthogonal to the scan electrodes and the sustain electrodes. A plasma display device comprising: a panel section in which a substrate is disposed opposite to the substrate section; and a drive section that outputs a drive voltage for driving the panel section, wherein the waveform of the drive voltage is a sustain pulse for maintaining discharge. There is a sustain period in which a voltage is alternately applied to the scan electrodes and the sustain electrodes, and the voltage value Vsh (V) of the last sustain pulse voltage is the voltage value Vst (V) of the previous sustain pulse voltage and the scan electrode. Vst ≦ Vsh <V with respect to the discharge start voltage value Vf2 (V) between the discharge electrode and the sustain electrode
The relationship is f2.

In the plasma display device of the present invention to achieve the above object, a substrate having scan electrodes and sustain electrodes formed in parallel with each other and a data electrode are formed so as to be orthogonal to the scan electrodes and the sustain electrodes. A plasma display device comprising: a panel section in which a substrate is disposed opposite to the substrate section; and a drive section that outputs a drive voltage for driving the panel section, wherein the waveform of the drive voltage is a sustain pulse for maintaining discharge. There is a sustain period in which a voltage is alternately applied to the scan electrodes and the sustain electrodes, and the pulse width ts2 of the last sustain pulse voltage is larger than the pulse width ts1 of the sustain pulse voltage before that.

According to the above, it is possible to obtain a plasma display device capable of suppressing erroneous discharge and performing stable image display even with a high-definition discharge cell structure.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) An embodiment of the present invention will be described below with reference to the drawings. The panel section in the present embodiment is the same as the panel section shown in FIG. 7, and the schematic configuration of the drive section that outputs a drive voltage for driving this panel section and each electrode of the panel section The connection state of is the same as that shown in FIG. Therefore, their description will be omitted.

FIG. 1 is a diagram showing a waveform of a drive voltage output by the drive unit for driving the panel unit of the plasma display device according to the embodiment of the present invention, and there is no accumulation of electric charge before energization. It shows an initialization period for accumulating initial charges for each electrode, and one subfield period thereafter.

One field period is a waveform for displaying one screen, and is composed of, for example, a plurality of first to eighth subfields. One subfield is composed of a wall voltage adjusting period, a writing period, a sustaining period and a removing period. The difference of this embodiment from the conventional one is that after the sustain period, a removal period is provided in which a ramp waveform voltage having a polarity different from that of the sustain pulse voltage is applied to an electrode different from the electrode to which the last sustain pulse voltage is applied. It is that.

The operation during this maintenance period and possible effects are as follows. In the removal period, the data electrode Di is Vrd (V) and the sustain electrode SUSi is 0 (V).
To Vnr with respect to the scan electrode SCNi.
A ramp waveform voltage that gradually decreases toward (V) is applied. Then, while the ramp waveform voltage is decreasing, as shown in FIG.
As shown in FIG. 5, a weak discharge 18 is generated with the data electrode Di being positive and the scan electrode SCNi being negative, and unnecessary negative charges 16 remaining on the protective film 5 on the scan electrode SCNi are removed, so that an erroneous discharge is generated. It is possible to suppress the occurrence of discharge. Here, FIG. 2 is a view taken along the line ZZ in FIG.

As described above, by providing the removal period in which the ramp waveform voltage having a polarity different from that of the sustain pulse voltage is applied to the electrode different from the electrode to which the last sustain pulse voltage is applied, erroneous discharge occurs. Can be suppressed. Therefore, it is possible to obtain a plasma display device capable of stable image display even with a high-definition discharge cell structure.

In the above description, when the scan electrode is A and the sustain electrode is B, the example in which the array on the substrate 1 is repeated ABAB is shown, but other than this, for example, it is adjacent. A with electrodes of the same type placed between cells
The same effect can be obtained with the BBA sequence. Here, in the case of high definition, the number of discharge cells increases, so that in the ABAB array, the capacitance between the electrodes in the panel section increases and the reactive power increases, but by using the ABBA array, It is possible to obtain the effect of reducing the electrostatic capacitance in the gap between adjacent cells and suppressing the generation of reactive power, thus suppressing the power consumption of the plasma display device.

Further, the minimum voltage value Vnr (V) of the ramp waveform voltage applied during the removal period is − with respect to the discharge start voltage value Vf1 (V) between the data electrode Di and the scan electrode SCNi.
The relationship of (Vf1-60) ≦ Vnr ≦ −30 is preferable because the effect of the present embodiment is further enhanced.

(Second Embodiment) Next, another embodiment of the present invention will be described with reference to the drawings. The panel section in the present embodiment is the same as the panel section shown in FIG. 7, and the schematic configuration of the drive section that outputs a drive voltage for driving this panel section and each electrode of the panel section The connection state of is the same as that shown in FIG. Therefore, the description thereof is omitted, and the difference of the present embodiment from the conventional one will be described below with reference to FIG.

FIG. 3 is a diagram showing a waveform of a drive voltage output by the drive unit for driving the panel unit of the plasma display device of the present embodiment, showing a sustain period, a wall voltage adjustment period and a writing period. ing.

This embodiment is different from the conventional one in that the peak voltage Vsh (V) of the last sustain pulse in the sustain period is
Vst <Vsh <V with respect to the peak voltage Vst (V) and the discharge start voltage Vf (V) of the sustain pulse before that.
The relationship is f.

The effect of this is considered to be as follows. Peak voltage Vsh of last sustain pulse
(V) is the peak voltage Vst of the sustain pulse before that
Since it is larger than (V), the electric attraction to the positive ions is large during the last sustaining discharge in the sustaining period, so that a long moving distance for the positive ions is outside the scan electrode SCNi, that is, the adjacent discharge. Inter-cell gap IP
Positive ions can reach near G as well. As a result, the scan electrodes SCNi after the last sustain discharge is applied
The wall voltage on the surface of the upper protective film 5 is sufficiently switched from negative to positive, and unnecessary negative charges do not remain, so that erroneous discharge does not occur.

As described above, the voltage value Vsh (V) of the last sustain pulse voltage is the voltage value Vst (V) of the previous sustain pulse voltage and the discharge start voltage value between the scan electrode and the sustain electrode. Vst ≦ Vsh with respect to Vf2 (V)
By setting the relationship to be <Vf2, it is possible to suppress erroneous discharge. Therefore, it is possible to obtain a plasma display device capable of stable image display even in a high-definition discharge cell structure.

Here, as the waveform of the drive voltage, as shown in FIG. 4, the waveform of the drive voltage in the present embodiment remains in the vicinity of the inter-adjacent discharge cell gap IPG as shown in the first embodiment. It is preferable to add a waveform of the driving voltage in the removal period for removing the unnecessary negative charges because the effect of removing the unnecessary negative charges is further enhanced.

The voltage value Vs of the last sustain pulse voltage
h (V) is Vst ≦ Vsh <Vf2, preferably (Vf2-50) ≦ Vsh <(Vf2-30) with respect to the discharge start voltage value Vf2 (V) between the scan electrode and the sustain electrode.
It is considered that the relationship of the following is satisfied, because the effect of the present embodiment is considered to be further enhanced.

(Third Embodiment) Another embodiment of the present invention will be described below with reference to the drawings. The panel section used in the present embodiment is the same as the panel section shown in FIG. 7, and the schematic configuration of the drive section that outputs the drive voltage for driving this panel section and each electrode of the panel section The connection state of is the same as that shown in FIG. Therefore, description thereof will be omitted, and the difference of the present embodiment from the conventional one will be described below with reference to FIG.

FIG. 5 is a diagram showing the waveform of the drive voltage output by the drive unit for driving the panel unit of the plasma display device of the present embodiment, showing the sustain period, the wall voltage adjustment period, and the write period. There is. The present embodiment is different from the conventional one in that this embodiment is different from the conventional one in that the pulse width ts2 (μs) of the last sustain pulse of the sustain period is the pulse width ts1 (μs of the previous sustain pulse). ) Is wider than that.

The effect of this is considered to be as follows. Since the pulse width ts2 of the last sustain pulse voltage is larger than the pulse width ts1 of the sustain pulse voltage before that, the migration time of the positive ions becomes long at the last sustain discharge of the sustain period. It becomes possible for positive ions to reach the outside of the scan electrode SCNi, which requires a long moving distance, that is, near the gap IPG between adjacent discharge cells. Switching to is sufficiently performed, and unnecessary negative charges do not remain, so that erroneous discharge does not occur.

As described above, erroneous discharge can be suppressed by setting the pulse width ts2 of the last sustain pulse voltage to be larger than the pulse width ts1 of the previous sustain pulse voltage. Therefore, it is possible to obtain a plasma display device capable of stable image display even in a high-definition discharge cell structure.

Here, as the waveform of the driving voltage, as shown in FIG. 6, the waveform of the driving voltage in the present embodiment remains in the vicinity of the inter-adjacent discharge cell gap IPG as shown in the first embodiment. It is preferable to add a waveform of the driving voltage in the removal period for removing the unnecessary negative charges because the effect of removing the unnecessary negative charges is further enhanced.

Further, the pulse width ts2 (μs) of the last sustain pulse in the sustain period is set to the sustain pulse width ts1 before that.
A relationship of (ts1 + 2) ≦ ts2 ≦ 20 with respect to (μs) is preferable because the effect of the present embodiment is considered to be further enhanced.

Further, in the above description, the driving method in which the pulse width of the last sustain pulse of the sustain period is made wider than the pulse width of the sustain pulse before that is used, but the present invention is not limited to this. From the second to the last of the maintenance period,
It goes without saying that the same effect can be obtained by using a driving method in which the pulse widths of the third and subsequent sustain pulses are made wider than the pulse widths of the sustain pulses before that.

In the first to third embodiments, the maximum voltage value Vrc (V) of the ramp waveform voltage applied to the scan electrodes during the wall voltage adjustment period is the discharge between the data electrode Di and the scan electrode SCNi. For the starting voltage value Vf1 (V),
It is preferable to have a relationship of (Vf1-50) ≦ Vrc <Vf1.

In the first to third embodiments, the gradients of the respective ramp waveform voltages in the erase period and the wall voltage adjusting period are so gradual that they need to be switched quickly and at the same time unnecessary discharge is not generated. Is required, and from such a viewpoint, 0.5 V / μs or more, 20 V
The range is preferably / μs or less.

As is clear from the above description, the scan electrodes SCN1 to SCNn and the sustain electrodes SUS1 to SUSn are exactly the same in the panel portion, and are distinguished by the applied drive voltage. Therefore, the first
To the scan electrode SCN1 shown in the third embodiment
~ Waveform of drive voltage applied to SCNn and sustain electrode SU
It goes without saying that the same effect can be obtained with the waveform of the drive voltage applied to S1 to SUSn even if both are interchanged.

[0050]

As is apparent from the above description, according to the plasma display device of the present invention, the waveform of the driving voltage output by the driving unit is the final ramp waveform voltage having a polarity different from the sustain pulse voltage. There is a removal period that is applied to an electrode that is different from the electrode to which the sustain pulse voltage is applied, and it is thought that this will erase unnecessary residual charges that remain near adjacent discharge cells that cause erroneous discharge. As a result, erroneous discharge is suppressed.

Therefore, it is possible to obtain a plasma display device capable of stable image display even in a high-definition discharge cell structure.

[Brief description of drawings]

FIG. 1 is a timing chart of a waveform of a drive voltage output by a drive unit of a plasma display device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a charge state inside the panel portion of the plasma display device according to the embodiment of the present invention.

FIG. 3 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.

FIG. 4 is a timing chart of waveforms of drive voltages output from a drive unit of a plasma display device according to another embodiment of the present invention.

FIG. 5 is a timing chart of waveforms of drive voltages output from a drive unit of a plasma display device according to another embodiment of the present invention.

FIG. 6 is a timing chart of waveforms of drive voltages output from a drive unit of a plasma display device according to another embodiment of the present invention.

FIG. 7 is a sectional perspective view showing a structure of a panel portion of a general plasma display device.

FIG. 8 is a diagram showing a schematic configuration of a drive unit of a general plasma display device and a connection state with each electrode of a panel unit.

FIG. 9 is a timing chart of waveforms of drive voltages output from a drive unit of a conventional plasma display device.

FIG. 10 is a cross-sectional view showing a charge state inside a panel portion of a conventional plasma display device.

[Explanation of symbols]

2 scanning electrodes 3 sustain electrodes 7 data electrodes 11 discharge cells 12 Data write drive circuit 13 Scan drive circuit 14 Initialization circuit 15 Sustaining drive circuit

Continued front page    (72) Inventor Bronze Victory             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Shunichi Wakabayashi             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F term (reference) 5C080 AA05 DD07 DD09 DD10 EE19                       EE29 FF12 HH02 HH04 HH05                       HH07

Claims (8)

[Claims] 1. A panel portion in which a substrate having a plurality of pairs of scan electrodes and sustain electrodes and a substrate having data electrodes formed so as to be orthogonal to the scan electrodes and the sustain electrodes are arranged to face each other, and a panel portion. A plasma display device comprising: a drive unit that outputs a drive voltage for driving a discharge voltage, wherein a waveform of the drive voltage alternately applies a sustain pulse voltage for sustaining discharge to the scan electrodes and the sustain electrodes. A plasma display device having a sustain period and a removal period in which a ramp waveform voltage having a polarity different from that of the sustain pulse voltage is applied to an electrode different from the electrode to which the last sustain pulse voltage is applied. 2. The minimum sustain pulse voltage is positive and the minimum voltage value Vnr (V) of the ramp waveform voltage in the erase period.
2. The plasma display according to claim 1, wherein has a relationship of − (Vf1-60) ≦ Vnr ≦ −30 with respect to the discharge start voltage value Vf1 (V) between the electrode for inputting the ramp waveform voltage and the data electrode. apparatus. 3. A panel section in which a substrate having a plurality of pairs of scan electrodes and sustain electrodes and a substrate having data electrodes formed so as to be orthogonal to the scan electrodes and the sustain electrodes are arranged to face each other, and a panel section. A plasma display device comprising: a drive unit that outputs a drive voltage for driving a discharge voltage, wherein a waveform of the drive voltage alternately applies a sustain pulse voltage for sustaining discharge to the scan electrodes and the sustain electrodes. It has a sustain period and the voltage value Vsh of the last sustain pulse voltage.
(V) is the voltage value Vst of the sustain pulse voltage before that
A plasma display device having a relationship of Vst ≦ Vsh <Vf2 with respect to (V) and a discharge start voltage value Vf2 (V) between the scan electrode and the sustain electrode. 4. The voltage value Vsh of the last sustain pulse voltage
The plasma according to claim 3, wherein (V) has a relationship of (Vf2-50) ≦ Vsh <(Vf2-30) with respect to a discharge start voltage value Vf2 (V) between the scan electrode and the sustain electrode. Display device. 5. A panel section in which a substrate having a plurality of pairs of scan electrodes and sustain electrodes and a substrate having data electrodes formed so as to be orthogonal to the scan electrodes and the sustain electrodes are arranged to face each other, and a panel section. A plasma display device comprising: a drive unit that outputs a drive voltage for driving a discharge voltage, wherein a waveform of the drive voltage alternately applies a sustain pulse voltage for sustaining discharge to the scan electrodes and the sustain electrodes. It has a sustain period and the pulse width ts2 of the last sustain pulse voltage.
, Which is larger than the pulse width ts1 of the sustain pulse voltage before that. 6. The pulse width ts2 of the last sustain pulse voltage
(Μs) is the pulse width ts of the sustain pulse voltage before that
The plasma display device according to claim 5, wherein the relationship (ts1 + 2) ≦ ts2 ≦ 20 is satisfied with respect to 1 (μs). 7. The waveform of the driving voltage is further after the sustain period,
The plasma display apparatus according to claim 3, further comprising a removal period in which a ramp waveform voltage having a polarity different from that of the last sustain pulse voltage is applied to an electrode different from the electrode to which the last sustain pulse voltage is applied. 8. The plasma display device according to claim 1, wherein the slope of the ramp waveform voltage in the removal period is 0.5 V / μs or more and 20 V / μs or less.