JP2000305515A - Ac plasma display device and driving method of ac plasma display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an AC plasma display device and its driving method capable of preventing image quality degradation by suppression of a cross talk during an address period, and improved in luminous efficiency. SOLUTION: In this AC plasma display device, first electrodes and second electrodes of plural-rows covered with a first dielectric layer are formed alternately in the row direction on one substrate, a third electrode group covered with a second dielectric layer is formed in the column direction on the other substrate facing to the substrate, the intervals between the first electrodes and the second electrodes are set wider than the intervals between the first electrodes and the third electrodes, and one discharge cell is composed on an intersection point of the three electrodes. In this case, during an address period when display data are written in each discharge cell, when the first electrode Xi+1 on the (i+1)th row is scanned, a bias voltage (-Vb) is applied on the second electrode Yi on the ith row, so that a discharge is not generated between the second electrode Yi and the first electrode Xi+1 on an adjacent row.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device for displaying an image by using discharge between electrodes, and more particularly, to an AC plasma display in which an AC voltage is applied to the electrodes during a sustain period to maintain the discharge. The present invention relates to a panel structure and a driving method.

[0002]

2. Description of the Related Art The configuration of a conventional AC plasma display panel is shown in FIG. As shown in FIG.
A C-type plasma display panel (hereinafter referred to as “panel”) 15 has a first glass substrate 1 with a discharge space 2 interposed therebetween.
3 and the second glass substrate 4 are arranged to face each other. The first glass substrate 13 is a transparent glass substrate,
On the first glass substrate 13, a plurality of strip-shaped scan electrodes 7 and sustain electrodes 8 covered with a dielectric layer 5 and a protective layer 6 are provided.
And are alternately arranged in parallel. In the drawing, only a pair of the scanning electrode 7 and the sustain electrode 8 are shown. The scanning electrode 7 and the sustaining electrode 8 are respectively composed of transparent electrodes 7a, 8a and metal bus bars 7b, 8b for increasing conductivity.

On the second glass substrate 4, a plurality of band-shaped data electrodes 9 are arranged in parallel in a direction perpendicular to the scanning electrodes 7 and the sustaining electrodes 8. In the figure, only one data electrode 9 is shown. Between the data electrodes 9,
A strip-shaped partition wall 10 for isolating each data electrode 9 and forming the discharge space 2 is provided. In addition, a phosphor 11 is formed from above the data electrode 9 to the side surface of the partition wall 10. The discharge space 2 is filled with a mixed gas of at least one kind of rare gas and xenon among helium, neon, and argon. Scan electrode 7 and sustain electrode 8
One discharge cell is formed at the intersection of the data electrode 9 and the data electrode 9.

[0004] The panel 15 is configured to view an image display from the first glass substrate 13 side which is the display surface side.
The panel 15 emits the fluorescent material 1 by ultraviolet rays generated by a discharge between the scan electrode 7 and the sustain electrode 8 in the discharge space 2.
1 is excited, and visible light from the phosphor 11 generated by the excitation is used for display light emission.

Next, a method of displaying image data on the conventional panel 15 will be described. In order to display image data, an initialization period for initializing the discharge cells, an address period for writing data to the discharge cells, and a sustain period for maintaining the light emission of the discharge cells are set, and a different signal waveform is applied to each electrode in each period. Is applied.

That is, in the initialization period, for example,
A pulse voltage of a positive polarity is applied to all the scan electrodes 7 with respect to the sustain electrodes 8 and the data electrodes 9, and wall charges are accumulated on the protective layer 6 and the phosphor 11.

Thereafter, during the address period, a positive data pulse is applied to the data electrode 9 only when display data is present, while sequentially applying a negative pulse to the scan electrode 7. At this time, a discharge between the scan electrode 7 and the sustain electrode 8 is induced by a discharge generated between the data electrode 9 and the scan electrode 7, and a wall charge is formed on the dielectric layer 5 according to the presence or absence of a data pulse. . The formation of the wall charges indicates a state in which data is written in the discharge cells.

In the subsequent sustain period, a voltage sufficient to maintain a discharge is applied between scan electrode 7 and sustain electrode 8 for a certain period. Thus, the scanning electrode 7 and the sustain electrode 8
Discharge plasma is generated at the intersection of
11 is excited to emit light. In a discharge space where no data pulse is applied during the address period, that is, in a discharge cell where no data is written, no light emission due to discharge occurs.

In such a conventional panel, the scanning electrodes 7
The interval 12 between the electrode and the sustain electrode 8 is set close to a value at which a minimum discharge voltage determined by Paschen's law is obtained. This is to reduce the external sustain voltage V _{su s} applied between the sustain electrodes 8 and the scanning electrode 7 in the sustain period.
That is, when the discharge start voltage between the sustain electrode 8 and the scan electrode 7 is V _fss, and the wall voltage between them is V _wss , there is a relationship of V _fss <V _sus + V _wss (1). By designing the panel so that V _fss is minimized, the display discharge can be maintained at a lower applied voltage V _sus . The lower the external sustain voltage V _sus is, the easier the circuit design is, and the loss due to the reactive power can be reduced.

At present, it is known that the luminous efficiency of the panel manufactured is highest when the total pressure of the filled gas is about 50 to 60 KPa and the partial pressure of the xenon gas is 5 to 10%. At this time, when the interval 12 between the scan electrode 7 and the sustain electrode 8 is 80 to 100 μm, the external sustain voltage V _sus
Is extremely small, and V _sus = 180 to 200 V is obtained.

[0011]

The above-mentioned conventional panel has a drawback that the light emission efficiency is extremely low as compared with a display device such as a CRT. For example, the above interval 1
In the case of a panel having a thickness of 2 to 80 μm, the luminous efficiency is 1
/ W) about 1/5 of the CRT before and after.

It is generally known that the luminous efficiency of discharge increases as the length between the electrodes increases. This is because there is a large voltage drop near the electrode serving as the cathode, and the ratio of light emission to the power consumed there is small. Increasing the electrode-to-electrode length increases luminous efficiency, but the discharge starting voltage V
_fss also rises sharply according to the Paschen curve, making driving difficult.

When the interval 12 is increased, as a result, the interval between the electrodes of adjacent cells is reduced, so that an undesirable discharge, that is, crosstalk, is likely to occur between adjacent discharge cells. If the crosstalk occurs during the above address period, an erroneous write occurs in which data is written to a cell adjacent to a cell to which data is to be written even though data write is unnecessary, and image display is not performed. There is a problem of disorder.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in consideration of the above problem.
It is an object of the present invention to provide a plasma display device and a method for driving an AC plasma display device.

[0015]

In order to solve the above problems, an AC type plasma display device according to the present invention has the following configuration. In the AC type plasma display device, two substrates are arranged opposite to each other with a partition therebetween, and a first electrode and a second electrode in a plurality of rows covered with a first dielectric layer in a row direction are provided on one of the substrates. A third electrode group formed alternately and covered with a second dielectric layer in the column direction is formed on the other substrate, and the distance between the first electrode and the second electrode is set to the first electrode and the third electrode. The distance is set wider than the distance between the electrodes, and one discharge cell is formed at the intersection of the three electrodes. Also, A
The C-type plasma display device initializes each discharge cell in an initialization period, writes data row by row in a discharge cell to emit light in an address period, and writes first data belonging to a discharge cell in which data is written in a sustain period. Light emission is maintained by repeating discharge between the electrode and the second electrode. At this time, the AC type plasma display device includes an electrode driving unit for applying a predetermined bias voltage to the second electrode.

When data is written to the discharge cells belonging to the even-numbered rows during the address period, the electrode driving means applies the second electrodes belonging to the odd-numbered rows to the second electrodes and the even-numbered rows adjacent to the odd-numbered rows. When applying a predetermined bias voltage that does not cause a discharge between the first electrodes belonging to the cell and writing data to the discharge cells belonging to the odd rows,
A bias voltage is applied to the second electrode belonging to the even-numbered row such that no discharge occurs between the second electrode and the first electrode belonging to the odd-numbered row adjacent to the even-numbered row.

[0017] Alternatively, the electrode driving means may include, during the address period, an even-row writing period for writing data only to the discharge cells belonging to the even-numbered rows and an odd-row writing period for writing data only to the discharge cells belonging to the odd-numbered rows. In the even-line writing period, the second electrodes of the even-numbered rows are controlled to a first constant potential capable of discharging with the first electrodes of the same row, and the second electrodes of the odd-numbered rows are connected to the adjacent even-numbered rows. Is controlled to a second constant potential such that no discharge occurs between the first electrode and the first electrode of the same row during the odd-row writing period. In addition to controlling the potential to the first constant potential, the second electrodes in the even-numbered rows are controlled to the second constant potential so that no discharge occurs between the adjacent first electrodes in the odd-numbered rows.

In the above AC type plasma display device, the amplitude of the voltage pulse applied to the first electrode and the second electrode during the sustain period is set to the first electrode or the second electrode when the first dielectric layer is on the cathode side. When the discharge is present between the first and second electrodes and the third electrode and is higher than the discharge start voltage between the electrodes and the third electrode, a half of the discharge start voltage between the first and second electrodes is generated. It may be set to be larger than 1. Alternatively, the amplitude of the voltage pulse applied to the first electrode and the second electrode during the sustain period may be set to be smaller than one half of the firing voltage between the first electrode and the second electrode. Alternatively, the amplitude of the voltage pulse applied to the first electrode and the second electrode during the sustain period is set to be smaller than the discharge starting voltage between the first electrode or the second electrode and the third electrode when the third electrode is a cathode. You may set it small.

In the driving method of an AC type plasma display device according to the present invention, two substrates are arranged opposite to each other with a partition wall interposed therebetween, and one substrate is covered with a first dielectric layer in a row direction in a plurality of rows. The first electrode and the second electrode are alternately formed, and a third electrode group covered with a second dielectric layer is formed on the other substrate in the column direction, and the first electrode and the second electrode The interval is set wider than the interval between the first electrode and the third electrode, and one discharge cell is formed at the intersection of the three electrodes. In the address period, data is written to the discharge cells that emit light in each row. And a method of driving an AC plasma display apparatus that maintains light emission by repeating a discharge between a first electrode and a second electrode belonging to a discharge cell in which data is written during a sustain period.

The driving method is as follows.
a) When data is written to a discharge cell belonging to an even-numbered row, a discharge is generated between a second electrode belonging to an odd-numbered row and a first electrode belonging to an even-numbered row adjacent to the odd-numbered row. Apply a predetermined bias voltage that does not occur,
b) When data is written to a discharge cell belonging to an odd-numbered row, a discharge is generated between a second electrode belonging to an even-numbered row and a first electrode belonging to an odd-numbered row adjacent to the even-numbered row. A predetermined bias voltage that does not occur is applied.

Alternatively, in the driving method, in the address period, an even-row writing period for writing data only to the discharge cells belonging to the even-numbered rows and an odd-row writing period for writing data only to the discharge cells belonging to the odd-numbered rows. A) In the even-number row writing period, the second
The electrodes are controlled to a first constant potential capable of discharging between the first electrodes in the same row, and the second electrodes in odd rows are not discharged between adjacent first electrodes in even rows. Second
B) In the odd-numbered row writing period, the second electrodes in the odd-numbered rows are controlled to the first constant potential that can be discharged between the first electrodes in the same row, and the second electrodes in the odd-numbered rows are also controlled. The two electrodes are controlled to a second constant potential so that no discharge occurs between the adjacent first electrodes in the odd-numbered rows.

According to the above configuration, during the scanning of a certain row in the address period, the first electrode belonging to the row and the second electrode belonging to the adjacent row have the same potential. Discharge or crosstalk between the electrode and the second electrode is prevented, that is, erroneous writing is prevented. As a result, the distance between the first electrode and the second electrode contributing to the sustain discharge can be increased, and an AC plasma display device can be realized in which the luminous efficiency is greatly improved without deteriorating the image quality.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an AC type plasma display panel according to the present invention will be described below in detail with reference to the accompanying drawings.

<First Embodiment> (Structure of Plasma Display Panel) FIG. 1 shows an AC type plasma display panel (hereinafter referred to as "panel").
It is sectional drawing which shows a structure of. FIG. 1B is a cross-sectional view taken along the line EE ′ in FIG.

As shown in FIG. 1, in a panel 1, a first glass substrate 3 and a second glass substrate 4 are arranged to face each other with a discharge space 2 interposed therebetween. The first glass substrate 3 is a transparent glass substrate.
On the upper side, an electrode group consisting of a pair of strip-shaped first and second electrodes X and Y covered with a dielectric layer 5 and a protective layer 6 is arranged in parallel with each other. For the protective layer 6, a material having a high secondary electron emission coefficient such as MgO (magnesium oxide) is used.

On the second glass substrate 4, a strip-shaped third electrode A is arranged in a direction orthogonal to the first electrode X and the second electrode Y. The plurality of third electrodes A are arranged in parallel on the second glass substrate 4 in the panel 1. A strip-shaped partition 10 for isolating each third electrode A and forming a discharge space 2 is provided between each third electrode A. Further, the phosphor 11 is formed from the third electrode A to the side surface of the partition wall 10. The discharge space 2 is filled with a mixed gas of at least one kind of rare gas and xenon among helium, neon, and argon. One discharge cell is formed near a point where the first electrode X and the second electrode Y intersect with the third electrode A.

The panel 1 is configured to view an image display from the first glass substrate 3 side which is the display surface side, and excites the phosphor 11 by ultraviolet rays generated by the discharge in the discharge space 2. The visible light from the phosphor 11 generated by the excitation is used for display light emission.

FIG. 2 is a view for explaining the arrangement of the first and second electrodes X and Y and the third electrode A on the first glass substrate 3 of the panel 1. It is assumed that there are a total of n electrodes X and Y. A discharge gap (hereinafter referred to as “main discharge gap”) d _ss is formed between a set of the first electrode X and the second electrode Y belonging to the same row. Further, a discharge cell C is formed at the intersection of each of the electrodes X, Y, and A. In this way, the discharge cells C are arranged in a matrix in the panel 1 in which a set of the first electrode X and the second electrode Y is a row and the third electrode A is a column. FIG. 2 shows a first electrode driving circuit 31x, a second electrode driving circuit 31y, and a third electrode driving circuit 31a for driving the first electrode X, the second electrode Y, and the third electrode A, respectively. I have. 1st electrode drive circuit 31x, 2nd
The electrode drive circuit 31y and the third electrode drive circuit 31a drive the first electrode X, the second electrode Y, and the third electrode A by controlling the respective potentials to predetermined potentials.

FIG. 3 shows the first panel 1 of the panel 1 of the present embodiment.
FIG. 3 is a diagram illustrating a distance between an electrode X and a second electrode Y. As shown in the drawing, in the panel of the present embodiment, the main discharge gap d _ss is 430 μm, and the gap between the third electrode A and the first electrode X (or the second electrode Y) (hereinafter referred to as “sub discharge gap”). "hereinafter.) d _sa has a 130μm, and is set to wide spacing of the main discharge gap d _ss to the sub-discharge gap d _{s a.} As a result, high luminous efficiency can be obtained unlike the related art in which the main discharge gap d _ss <the sub discharge gap d _sa . Here, examples of the design values of the panel of the present embodiment are shown below. Cell interval: 1080 μm Main discharge gap: 430 μm Partition height: 130 μm Electrode width: 100 μm Gas composition: Xe (5%), Ne (95%) Gas pressure: 60 kpa

In FIG. 3, the second electrode Y of the cell in the i-th row
and _i, the gap between the first electrode X _{i +1} (i + 1) th row of the cell d
_aj is 450 μm, and the main discharge gap d _ss (= 430
μm). That is, the first electrode X _i and the discharge start voltage between the second electrodes Y _i in the same cell (e.g.,
720 V) and the discharge start voltage (eg, 750 V) between the first electrode X _{i + 1} and the second electrode Y _i between different cells is reduced (30 V), so that the electrodes Y _i and X
Discharge across the cell between _{i + 1} , that is, crosstalk is likely to occur. Since the crosstalk disturbs the image display, some means for preventing the crosstalk is required. The panel of the present embodiment controls image display so as to prevent crosstalk as described later.

(Control of Plasma Display Panel) Control for displaying the panel 1 of the present embodiment will be described below. First, the firing voltage between the electrodes referred to in the following description is defined as follows. V _fss: discharge start voltage between the first electrode X and the second electrode Y in the same cell V _{f a j:} when a discharge is caused between different cells, and the first electrode X of one cell, one cell Of the other cell adjacent to
Discharge starting voltage V _fsa between electrode Y and first electrode X (or second electrode Y) when first electrode X (or second electrode Y) is used as a cathode (cathode).
_Firing voltage _Vfas between the first electrode X and the third electrode A when the third electrode A is a cathode
(Or the second electrode Y) and the discharge starting voltage V _fssa between the third electrode A: the first electrode X (or the second electrode Y) and the third electrode A
Discharge start voltage between the first electrode X and the second electrode Y when a discharge exists between the first electrode X and the second electrode Y

Here, V _fss is the same as the discharge starting voltage between the scan electrode 7 and the sustain electrode 8 in the conventional panel, but in the present embodiment, the gap between the first electrode X and the second electrode Y is increased. Since it is larger than in the conventional case, its value is higher than the discharge starting voltage in the conventional case. Also, V _fsa and V _fas differ only in the polarity of discharge, but MgO having a high secondary electron emission coefficient is provided on the first electrode X, and an electron emission coefficient of MgO is provided on the third electrode A. V _{fs a}
The relationship of faV _fas holds. Further, the first electrode X and the third electrode X
When a discharge (hereinafter, referred to as “preliminary discharge”) occurs in advance between the electrode A and the electrode A, a large amount of initial charge is generated.
For this reason, when the discharge is performed between the first electrode X and the second electrode Y immediately after the preliminary discharge, the discharge starting voltage is greatly reduced as compared with the case where the preliminary discharge is not performed. That is, V _fssa ≪
V _fss .

In the panel of the present embodiment, the discharge starting voltages were V _fss = 720 V V _faj = 750 V V _fsa = 250 V V _fas = 350 V V _fssa = 450 V.

FIG. 4 is a diagram showing an example of voltage waveforms applied to the electrodes X, Y and A by the electrode drive circuits 31x, 31y and 31a to display an image on the panel of the present embodiment. This diagram shows the voltage waveforms applied to each of the first electrode X, the second electrode Y, and the third electrode A in the i-th row and the (i + 1) -th row. FIG. 4A shows the i-th
FIG. 4B shows a voltage waveform applied to the first electrode X _i in the row, and FIG. 4B shows a voltage waveform applied to the second electrode Y _i in the i-th row. 4C shows a voltage waveform applied to the first electrode X _{i + 1} in the (i + 1) th row, and FIG. 4D shows a voltage waveform applied to the second electrode X _{i + 1} in the (i + 1) th row.
3 shows a voltage waveform applied to an electrode Y _{i + 1} . (E) of FIG.
Indicates a voltage waveform applied to the third electrode A.

As shown in FIG. 4, in order to display image data on the panel 1, an initialization period for initializing cells, an address period for writing display data in each cell, and a sustain period for maintaining light emission are respectively provided. Then, different signal waveforms (pulses) are applied to the electrodes in each period. Hereinafter, each period will be described.

(Control of Initialization Period) In the initialization period, for example, as shown in FIG. 4, a positive voltage waveform is applied to all the first electrodes X, and a wall is formed on the protective layer 6 and the phosphor 11. Accumulate charge. The voltage waveform in the initialization period is set so that the voltage applied between the protective layer 6 on the first electrode X and the phosphor 11 on the third electrode A becomes almost V _fsa at the end of the initialization period. Have been. When the initialization period ends, the operation shifts to the address period.

(Control of Address Period) In the address period, the first electrodes X are scanned while sequentially applying a negative pulse (hereinafter referred to as a “scan pulse”) to each of the first electrodes X. While one first electrode X is being scanned, a positive data pulse is applied to the third electrode A of a plurality of cells to which display data is to be written among the plurality of cells connected to the first electrode X. I do. Only when a positive data pulse is applied to the third electrode A, a discharge occurs between the third electrode A and the first electrode X, and this discharge induces a discharge between the first electrode X and the second electrode Y. Then, wall charges are formed on the protective layer 6 according to the presence or absence of the data pulse. In the subsequent sustain period, display light emission is performed using the wall charges. While the first electrode is sequentially scanned, the second electrode Y is controlled to a predetermined potential.

Here, control of the second electrode Y will be described. To initiate the discharge between the first electrode X and the second electrodes Y, as shown in FIG. 4, when applying a scan pulse to the first electrode X _i of the i-th row, the voltage to the second electrode Y _i applying a pulse of V _b. Voltage V _b is set to a value that satisfies the relationship of _{V b + V wss> V fssa} . Here, V _wss is the sum of wall voltages due to wall charges between the first electrode X and the second electrode Y.

[0039] Incidentally, conventionally, when writing data to the cells connected to the first electrode X _i of the i-th row, the scan pulse is applied to the first electrode X _i of the i-th row, the first electrode X _i Was set to 0 V, and a bias _Vb was applied to all the second electrodes Y. However, in this case, as described above, since the inter-electrode distance in the same cell and the inter-electrode distance between the cells are substantially equal, the electrode X _i in the cell in the i-th row is
There is a high possibility that a discharge will occur across the cell between the second electrode Y _i-1 in the adjacent row. That is, since the _firing voltage V _fss (= 720 V) in the same cell and the _firing voltage V _faj (= 750 V) between the electrodes beyond the cell become substantially equal, there is a possibility that crosstalk may occur. high. Therefore, there is a problem that erroneous writing occurs.

Therefore, in the present embodiment, in order to prevent such erroneous writing, when data writing is performed in the address period, the first electrode X of the row to which the cell to be written belongs and a row adjacent to the first electrode X are arranged. The potential of the second electrode Y is controlled so that the potential of the second electrode Y to which it belongs is the same.

For example, as shown in FIGS. 4B and 4C, the first electrode X _{i +1} in the (i + 1) -th row and the second electrode in the i-th (or i + 2) -th row adjacent to that row. Y _i (or Y _i
+2 ) and the same potential. That is, at the timing when the first electrode X _{i in} a certain row is scanned (that is, when the scanning pulse is applied), the voltage of the second electrode Y _i-1 or Y _{i + 1 in} the adjacent row is changed to the voltage V _b only lowered to the first electrode X _i and same potential. For this reason, as shown in FIGS. 4B and 4D, the adjacent first electrode Y is connected to the second electrode Y.
Pulse waveform voltage by V _b for each of the scan pulse to the electrode X is applied is reduced is applied. By controlling the potential of the second electrode in the address period in this way,
It is possible to prevent undesired discharge, that is, crosstalk, that exceeds the cell between the first electrode X and the second electrode Y, that is, to prevent occurrence of erroneous writing.

(Control of Sustain Period) When the sustain period starts after the address period, an AC pulse (hereinafter, referred to as a “sustain pulse”) is applied to all the electrodes X and Y, and the cells selected in the address period are applied. That is, a pulse discharge is continuously generated in the cell in which the wall charges are formed.

Here, in the present embodiment, the value of the external sustain voltage V _sus when driving the panel 1 is set so as to satisfy the following relationship. V _fsa <V _wsa <V _fas (2) V _fssa <V _sus + V _wss <V _fss (3) where V _wsa is a wall voltage between the second electrode Y and the third electrode A. At this time, V _{w ss} ≒ V _sus, since it is V _wsa ≒ V _sus, the above equation (2), (3), _{respectively, V fsa <V sus <V} fas (2 ') V fssa / 2 <V sus <V _fss / 2 (3 ′).

By applying such a sustain pulse,
A second electrode Y and a third electrode A having the second electrode Y as a cathode side;
The discharge between the first electrode X and the second electrode Y is induced by the preliminary discharge during the period, and the voltage V _lower than the normal discharge start voltage _Vfss
Discharge starts at _fssa . In this embodiment, V _fss −V _fssa
= 720V-450V = 270V voltage reduction was realized.

In FIG. 4, a period t ₁ in the sustain period is shown.
Then, in the electrode pair of each row, the first electrode X and the third electrode A
The first electrode X becomes negative with respect to the third electrode A due to wall charges between the first electrode X and the first electrode X as a cathode.
A preliminary discharge occurs between the electrode X and the third electrode A, and a discharge between the first electrode X and the second electrode Y is induced by the preliminary discharge. In the next period t _2, in each row electrode pair, the second
Due to wall charges between the electrode Y and the third electrode A, the second electrode Y
Has a negative polarity with respect to the third electrode A, a preliminary discharge occurs between the second electrode Y having the second electrode Y as a cathode and the third electrode A, and the first electrode X and the second electrode Discharge between the electrodes Y is induced. In this way, after that, in each discharge cell, the first electrode X or the second electrode that causes the preliminary discharge with the third electrode A is switched, and the discharge (display) between the first electrode X and the second electrode Y is performed. Discharge) is repeated.

As described above, in the sustain period, the first
The preliminary discharge between the electrode X or the second electrode Y and the third electrode A causes a discharge in the main discharge gap between the first electrode X and the second electrode Y. Compared to conventional panels that generate sustain discharge,
The panel of the present embodiment having a wide main discharge gap can be easily driven.

As described above, it is possible to obtain an AC-type plasma display panel in which the luminous efficiency is increased while suppressing an increase in the drive voltage of each electrode and the occurrence of crosstalk.

<Second Embodiment> Next, a second embodiment of the plasma display panel according to the present invention will be described. The plasma display panel of the present embodiment has a first
The first embodiment in the address period is different from the first embodiment.
The control of the electrode and the second electrode is different. That is, in this embodiment, the address period is divided into the first and second half periods,
In the first half, first, only the electrodes belonging to the odd rows are sequentially scanned, and in the second half, only the electrodes belonging to the even rows are sequentially scanned. In each period, the potential of the Y electrode is maintained at a predetermined value, and the Y electrode is used to prevent the occurrence of crosstalk as in the first embodiment.
The potential of the electrode is controlled to be equal to the potential of the X electrode adjacent to the cell beyond the cell. By performing such control, erroneous writing due to crosstalk during the address period can be prevented, and power loss can be reduced by removing the AC component of the voltage applied to the second electrode Y.

FIG. 5 shows the i-th row and the i-th row in this embodiment.
The first electrode X, the second electrode Y, and the third electrode A in the +1 row
FIG. 4 is a diagram showing an example of a voltage waveform applied to each of the above. In FIG. 5, for convenience of explanation, i is an odd number. The initialization period and the sustain period are the same as in the first embodiment shown in FIG.

In the first embodiment, since the negative bias voltage is applied to the second electrode Y every scan pulse of the first electrode X during the address period, the voltage of the second electrode Y changes up and down. . On the other hand, in the present embodiment, a constant voltage is applied to the second electrode Y during a predetermined period during the address period as shown in FIG. That is, they are controlled to the respective predetermined values in the first half and the second half of the address period. Therefore, the AC component of the voltage applied to the second electrode Y is removed, and the power loss due to the stray capacitance of the panel is reduced.

FIG. 6 is a diagram showing the scanning order of the first and second electrodes X and Y in this embodiment. In the present embodiment, the first electrodes X in the odd rows are scanned in the first half of the address period, and the first electrodes X in the even rows are scanned in the second half of the address period.

That is, in the first half of the address period, only the odd-numbered first electrodes X are scanned as shown in FIG. During this time, the positive bias voltage _Vb is applied to the second electrodes Y in the odd rows, the same voltage 0 as the scanning pulse is applied to the second electrodes Y in the even rows, and the first electrodes X in the odd rows are sequentially scanned. Pulses are applied. In the latter half of the address period, only the first electrodes X in the even-numbered rows are scanned as shown in FIG. During this time, the same voltage 0 as the scan pulse is applied to the second electrodes Y in the odd rows, the positive bias voltage _Vb is applied to the Y electrodes in the even rows, and the scan pulses are sequentially applied to the first electrodes X in the even rows. I will do it.

By applying a bias voltage to each electrode as described above, a scanning pulse is applied to the first electrode X being scanned and the second electrode Y in a row adjacent to the row of the first electrode X. Because it is always at the same potential as the X electrode
The occurrence of crosstalk can be prevented.

In the first embodiment, since a pulse voltage is continuously applied to the second electrode Y in accordance with the scanning of the first electrode X during the address period, power loss is caused by charging / discharging the stray capacitance of the panel. appear. On the other hand, in the present embodiment, since the voltage applied to the second electrode Y during the address period is substantially DC, such a power loss can be reduced.

As described above, in this embodiment, in addition to the effects of the first embodiment, it is possible to obtain an AC type plasma display panel in which the power loss during the address period is further reduced.

In the above embodiment, the first electrode,
The second electrode, even number, odd number, and the like are set for the sake of convenience, and the basic operation is exactly the same even if they are interchanged. Further, the applied voltage waveform in the initialization period does not necessarily need to be the same as that in the above-described example, and may be any as long as wall charges for facilitating subsequent sustain discharge are formed in the address period. Furthermore, the initialization period, the address period, and the sustain period do not need to be separated from each other as in this embodiment, and the respective periods may overlap each other.

[0057]

According to the present invention, in an AC plasma display device in which the distance between the first electrode and the second electrode is widened, the distance between the first electrode and the second electrode in the same discharge cell and the distance between the adjacent cells are reduced. Even when the distance between the first electrode and the second electrode is substantially equal, it is possible to prevent crosstalk between the first electrode and the second electrode during the address period and prevent erroneous writing. As a result, it is possible to realize an AC plasma display device with improved luminous efficiency without deteriorating image quality.

[Brief description of the drawings]

FIG. 1 is a sectional view of an AC plasma display panel according to the present invention.

FIG. 2 is a diagram showing an arrangement of electrodes of an AC type plasma display panel according to the present invention and a drive circuit for driving them.

FIG. 3 is a diagram showing a distance between first and second electrodes of the AC type plasma display panel according to the present invention.

FIG. 4 is a view for explaining a drive voltage waveform of each electrode of the AC plasma display panel according to the first embodiment.

FIG. 5 is a diagram illustrating a drive voltage waveform of each electrode of an AC plasma display panel according to a second embodiment.

FIGS. 6A and 6B are diagrams illustrating (a) the scanning order of the first and second electrodes in an odd-numbered row and (b) the scanning order of the first and second electrodes in an even-numbered row in the second embodiment. .

FIG. 7 is a sectional view of a conventional AC plasma display panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 AC type plasma display panel 2 Discharge space 3 1st glass substrate 4 2nd glass substrate 5 Dielectric layer 6 Protective layer 10 Partition 11 Fluorescent substance 31x 1st electrode drive circuit 31y 2nd electrode drive circuit 31a 3rd electrode drive Circuit X First electrode Y Second electrode A Third electrode C Discharge cell

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01J 11/02 H01J 11/02 B (72) Inventor Koji Ito 1006 Kazuma Kazuma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Yoshihisa Oe 1006 Kazuma, Kazuma, Osaka Pref. Matsushita Electric Industrial Co., Ltd.F-term (reference) JJ04 JJ06

Claims (7)

[Claims] 1. Two substrates are arranged opposite to each other with a partition wall interposed therebetween. On one of the substrates, a plurality of rows of first and second electrodes covered with a first dielectric layer are alternately arranged in a row direction. A third electrode group is formed on the other substrate and covered with a second dielectric layer in the column direction, and the first electrode and the second electrode group are formed on the other substrate.
The distance between the electrodes is set wider than the distance between the first electrode and the third electrode, and one discharge cell is formed at the intersection of the three electrodes. Is written for each row, and in the sustain period, the discharge is repeated between the first electrode, the second electrode, and the third electrode belonging to the discharge cell in which data is written, and the AC type plasma display device maintains the light emission, In the case where data is written to the discharge cells belonging to the even-numbered rows during the address period, the second electrodes belonging to the odd-numbered rows are connected between the second electrodes and the first electrodes belonging to the even-numbered rows adjacent to the odd-numbered rows. In the case where a predetermined bias voltage that does not generate a discharge is applied, and when data is written to the discharge cells belonging to the odd-numbered rows, the second electrodes and the second electrodes belonging to the even-numbered rows are An AC-type plasma display device comprising an electrode driving means for applying a predetermined bias voltage such that no discharge occurs between the first electrode belonging to an odd-numbered row and an even-numbered row. 2. A plurality of first electrodes and a plurality of rows of first and second electrodes covered with a first dielectric layer are alternately arranged in a row direction on one of the two substrates with a partition wall interposed therebetween. A third electrode group is formed on the other substrate and covered with a second dielectric layer in the column direction, and the first electrode and the second electrode group are formed on the other substrate.
The distance between the electrodes is set wider than the distance between the first electrode and the third electrode, one discharge cell is formed at the intersection of the three electrodes, and the discharge cells emit light for each row in the address period. Data is written to the first electrodes belonging to the discharge cells in which the data is written during the sustain period.
An AC-type plasma display device for maintaining light emission by repeating discharge between a second electrode and a third electrode, wherein in the address period, an even-row write period for writing data only to discharge cells belonging to an even-row, An odd-row writing period in which data is written only to the discharge cells belonging to the row; and in the even-row writing period, a first electrode capable of discharging the second electrode of the even-row with the first electrode of the same row. In addition to controlling the potential at a constant potential, the second electrode in the odd-numbered row is controlled to a second constant potential that does not cause a discharge between the adjacent first electrode in the even-numbered row. And controlling the second electrodes in the odd rows to a first constant potential that can be discharged between the first electrodes in the same row and the second electrodes in the even rows with the first electrodes in the adjacent odd rows. Discharge AC comprising electrode driving means for controlling the potential to a second constant potential that does not occur.
Type plasma display device. 3. An amplitude of a voltage pulse applied to the first electrode and the second electrode during the sustain period is equal to the first pulse.
When the dielectric layer of the first electrode or the second electrode is higher than the discharge starting voltage between the first electrode or the second electrode and the third electrode when the dielectric layer is on the cathode side,
The first electrode and the second electrode when a discharge exists between the electrodes;
3. The AC-type plasma display device according to claim 1, wherein the discharge start voltage between the electrodes is larger than one half. 4. The method according to claim 1, wherein the amplitude of the voltage pulse applied to the first electrode and the second electrode during the sustain period is equal to the first pulse.
The AC plasma display device according to any one of claims 1 to 3, wherein the discharge start voltage between the electrode and the second electrode is set to be less than half. 5. An amplitude of a voltage pulse applied to the first electrode and the second electrode during the sustain period is equal to the third pulse.
5. The discharge start voltage between the first electrode or the second electrode and the third electrode when the electrode is a cathode is set to be lower than the discharge start voltage. 4. The AC type plasma display device according to item 1. 6. A plurality of rows of first and second electrodes covered with a first dielectric layer in a row direction are alternately arranged on one of the two substrates with a partition wall interposed therebetween. A third electrode group is formed on the other substrate and covered with a second dielectric layer in the column direction, and the first electrode and the second electrode group are formed on the other substrate.
The distance between the electrodes is set wider than the distance between the first electrode and the third electrode, and one discharge cell is formed at the intersection of the three electrodes. Is written for each row, and during the sustain period, the discharge between the first electrode, the second electrode, and the third electrode belonging to the discharge cell to which data is written is repeated to maintain the light emission, thereby driving the AC plasma display apparatus. In the address period, a) when data is written to a discharge cell belonging to an even-numbered row, a second electrode belonging to an odd-numbered row is compared with a second electrode belonging to an even-numbered row adjacent to the second electrode belonging to the odd-numbered row. B) applying a predetermined bias voltage such that no discharge occurs between one electrode and b) when writing data to the discharge cells belonging to the odd-numbered rows, The driving method of the AC type plasma display apparatus characterized by applying a predetermined bias voltage that discharge is not generated between the first electrode belonging to the odd row adjacent to the even row and the second electrode. 7. A plurality of rows of first and second electrodes covered with a first dielectric layer in a row direction are alternately arranged on one of the two substrates with a partition wall interposed therebetween. A third electrode group is formed on the other substrate and covered with a second dielectric layer in the column direction, and the first electrode and the second electrode group are formed on the other substrate.
The distance between the electrodes is set wider than the distance between the first electrode and the third electrode, one discharge cell is formed at the intersection of the three electrodes, and the discharge cells emit light for each row in the address period. Data is written to the first electrodes belonging to the discharge cells in which the data is written during the sustain period.
A method for driving an AC plasma display device that maintains light emission by repeating discharge between a second electrode and a third electrode, wherein in the address period, an even-row write period in which data is written only to discharge cells belonging to an even-row. And an odd-row writing period in which data is written only to the discharge cells belonging to the odd-row. A) In the even-row writing period, the second row of the even-row is written.
The electrodes are controlled to a first constant potential capable of discharging between the first electrodes in the same row, and the second electrodes in odd rows are not discharged between adjacent first electrodes in even rows. Second
B) In the odd-numbered row writing period, the second potential of the odd-numbered row is controlled.
The electrodes are controlled to a first constant potential capable of discharging between the first electrodes in the same row, and the second electrodes in the even rows are not discharged between the adjacent first electrodes in the odd rows. Second
A method for driving an AC type plasma display device, characterized in that the potential is controlled to a constant potential.