JP2003142001A - Plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance luminous efficiency without increasing power consumption in a plasma display panel used in the image display of a computer, a television, or the like. SOLUTION: This plasma display panel is constituted so that a scanning electrodes and a sustaining electrodes are divided into first scanning electrodes 41, second scanning electrodes 42, first sustaining electrodes 51, and second sustaining electrodes 52, and when voltage Va and voltage Vb are applied to the scanning electrodes and the sustaining electrodes with the relation Va>Vb, the relation of Va2>Va1>Vb1>Vb2 is established between a potential Va1 on the surface of a dielectric covering the first scanning electrodes 41 and a potential Va2 on the surface of the dielectric covering the second scanning electrodes 42, a potential Vb1 on the surface of the dielectric covering the first sustaining electrodes 51 and a potential Vb2 on the surface of the dielectric covering the second sustaining electrodes 52. Thereby, discharge of high luminous efficiency over a long path is realized without making structure complex.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a plasma display panel.

[0002]

2. Description of the Related Art Conventionally, FIG. 13 is a perspective view of an AC surface discharge type plasma display panel, and FIG. 14 is a view of an electrode structure.
Shown in.

As shown in FIG. 13, in a conventional panel 1, a front substrate 2 made of glass and a rear substrate 3 made of glass are arranged to face each other, and ultraviolet rays are radiated into the gap between them by discharge. A gas, such as neon and xenon, is enclosed.

On the surface substrate 2, an electrode group consisting of a pair of scan electrodes 4 and sustain electrodes 5 forming a pair is formed in parallel with each other so as to form a counter gap therebetween. There is. A dielectric layer 6 is formed so as to cover the scan electrodes 4 and the sustain electrodes 5, and a protective layer 7 is formed thereon.

On the rear substrate 3, strip-shaped write electrodes 11 covered with a dielectric layer 10 are arranged in parallel to each other in a column direction orthogonal to the scan electrodes 4 and the sustain electrodes 5, and each write electrode 11 is arranged. Strip-shaped barrier ribs 8 are provided between the write electrodes 11 to isolate the electrodes from each other and to form a discharge space. In addition, a phosphor layer 9 is formed on the dielectric layer 10 and on the side surface of the partition wall 8.

FIG. 14 shows the positional relationship among the scan electrodes 4, the sustain electrodes 5, the partition walls 8 and the write electrodes 11. Figure 1
As shown in FIG. 4, the scan electrodes 4 and the sustain electrodes 5 are composed of metal buses 4a and 5a and transparent electrodes 4b and 5b, respectively, for increasing conductivity. Transparent electrodes 4b, 5
b has a function of spreading the discharge so that the discharge occurs in a larger volume.

The panel 1 is designed so that an image display can be seen from the side of the front substrate 2, and the phosphor layer 9 is made to irradiate by the ultraviolet rays generated by the discharge between the scan electrode 4 and the sustain electrode 5 in the discharge space. It is excited and the visible light from the phosphor layer 9 is utilized for display light emission. At the intersection of the scan electrode 4 and the sustain electrode 5 and the write electrode 11, two partition walls 8 are formed.
One discharge cell is formed in the region sandwiched between. A discharge gap is formed between the scan electrode 4 and the sustain electrode 5.

Next, a conventional PDP driving method will be described with reference to FIG. As a conventional plasma display panel driving method, a subfield method is often used. This sub-field method divides one TV field into a plurality of sub-fields, applies a weighted number of pulses so that each sub-field displays a predetermined brightness, and combines the sub-fields to produce a gray scale. Is to express. In the following description, 1
The voltage applied to each electrode of panel 1 during one subfield will be described.

FIG. 15 shows an example of a voltage waveform applied to each electrode of the scan electrode 4, the sustain electrode 5, and the write electrode 11 for driving the conventional PDP. In FIG. 15, first, an initialization pulse Vset is applied to the scan electrode 4 to initialize the wall charges in the discharge cells of the panel. The bias voltage Vscan is applied to the scan electrodes 4 other than the cell to be selected next, and the bias voltage Vscan is removed from the cell to be selected, and at the same time, the write pulse Vd is applied to the write electrode 11.
By applying ata, write discharge is generated.
By this writing discharge, wall charges are accumulated on the surfaces of the dielectric layer 6, the protective layer 7, and the phosphor layer 9. The same write operation is sequentially performed over the entire panel to select the cell to be displayed.

Next, in order to perform the sustain discharge, the write electrode 11 is grounded, and the sustain pulse Vsus is alternately applied to the scan electrode 4 and the sustain electrode 5, so that the protective layer is formed in the cell in which the wall charges are accumulated. 7 When the potential on the surface exceeds the discharge start voltage, discharge is generated, and sustain discharge is repeatedly performed during the period in which the sustain pulse is applied (sustain period).

After that, by applying the erase pulse Verase, the wall charges are extinguished and the erase is performed. Note that the drive waveform shown in FIG. 15 is an example, and there are cases where an initialization waveform having a shape other than that shown in FIG. 15 is applied and cases where a voltage is applied in the negative direction.

[0012]

Conventionally, in the plasma display panel as shown in FIG. 13, low luminous efficiency has been a problem. In this conventional panel, only less than 1% of the power consumed in the discharge is utilized as visible light. Due to such low luminous efficiency, in the plasma display using this panel, the power consumption increases as the brightness increases.

Luminous efficiency is generally known to increase when a long-path discharge is used. For example, Japanese Patent Application Laid-Open No. 2
The discharge having a long path as disclosed in Japanese Patent Application Laid-Open No. 001-236884 allows not only a large positive column region that consumes a small amount of energy to be taken in the glow discharge, but also a vicinity of the phosphor in the glow discharge. Since the ultraviolet light is emitted in the above step, the loss due to the ultraviolet light re-exciting the discharge gas particles (self-absorption) can be reduced, so that the light emission efficiency is improved. However, such a long path discharge requires a high drive voltage. As a means of improving this, society
Four Information Display '00 Digest pages 106-109 (Schemerh
orn et. al, SID'00 Digest p
p. 106-109) have been proposed. A similar configuration is also disclosed in Japanese Patent Laid-Open No. 2001-210243.

In the structure proposed here, in addition to the scan electrode 4 and the sustain electrode 5 which cause a discharge of a long path, a trigger electrode which causes a trigger discharge is arranged. By applying a voltage to this trigger electrode in synchronism with the application of a voltage that causes a sustain discharge to the scan electrode 4 and the sustain electrode 5, a discharge is started between the trigger electrodes, and the priming is used to The discharge is also made between the scan electrode 4 and the sustain electrode 5, which is a long discharge path. According to this structure, it has been reported that this discharge form certainly increased the luminous efficiency.

However, actually, there is a big problem when trying to realize this structure as a plasma display panel. That is, the number of electrodes extending in the row direction is doubled from the conventional two electrodes per row to four electrodes per row. This not only complicates the structure of the drive circuit, but also doubles the number of connecting portions between the drive circuit and the panel, that is, the number of lead-out portions of the electrodes, which makes it extremely difficult to achieve high definition.

The present invention has been made in view of the problems of the prior art as described above, and realizes discharge of a long path at a low voltage without adding an electrode for applying another potential, and discharge having high luminous efficiency. The purpose is to realize.

[0017]

In order to solve the above problems, in the plasma display panel of the present invention, the scan electrode and the sustain electrode are divided into two or more parts, and the same potential is applied to each divided part. At this time, the potentials appearing on the surface of the dielectric covering the divided portions are different from each other.

In particular, the scan electrode is divided into the first scan electrode and the second scan electrode from the side closer to the discharge gap, and the sustain electrode is further divided into the first sustain electrode and the second sustain electrode from the side closer to the discharge gap. The same potential Va is applied to the first scan electrode and the second scan electrode, and the same potential Vb is applied to the first sustain electrode and the second sustain electrode.
When given in the relationship of a> Vb, the potential Va1 of the surface of the dielectric covering the first scan electrode, the potential Va2 of the surface of the dielectric covering the second scan electrode, and the potential of the surface of the dielectric covering the first sustain electrode. Vb1, the potential Vb of the surface of the dielectric that covers the second sustain electrode
2 and Va2>Va1>Vb1> Vb2.

As a result, the luminous efficiency can be improved without complicating the structure.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS That is, the invention according to claim 1 of the present invention is such that the scan electrodes and the sustain electrodes are arranged with a discharge gap therebetween and are arranged so as to cover the scan electrodes and the sustain electrodes. A first substrate having a dielectric layer formed thereon,
The first substrate has a second substrate which is opposed to the first substrate so as to form a discharge space between the first substrate and a write electrode, and the intersection of the scan electrode and the sustain electrode with the write electrode. A plasma display panel having discharge cells formed therein, wherein the scan electrode is divided into a first scan electrode and a second scan electrode from a portion closer to the discharge gap, and the sustain electrode is closer to the discharge gap. Is divided into a first sustain electrode and a second sustain electrode, the same potential Va is applied to the first scan electrode and the second scan electrode, and the same potential Vb is applied to the first sustain electrode and the second sustain electrode. > Vb, the surface potential Va1 of the dielectric layer covering the first scan electrodes, the surface potential Va2 of the dielectric layer covering the second scan electrodes, and the dielectric covering the first sustain electrodes. layer Potential of the surface Vb1, between a potential Vb2 of the second sustain cover the electrode surface of the dielectric layer of, Va2
The configuration is such that the relationship of>Va1>Vb1> Vb2 is obtained.

Further, according to the present invention, the potential Va is applied to the first scan electrode and the second scan electrode, and Vb is applied to the first sustain electrode and the second sustain electrode.
And the potential distribution on the surface of the dielectric has an inflection point between the first scan electrode and the second scan electrode and between the first sustain electrode and the second sustain electrode. Is.

In the present invention, the width of the first scan electrode and the first sustain electrode is W1, the distance between the first scan electrode and the second scan electrode is Wdc, the distance between the first sustain electrode and the second sustain electrode is Wdc, and the dielectric constant is Wdc. When the thickness of the body layer is D, D ≧ 2.5 × D-2 × W
It is set to a range satisfying 1 + 48.0, and more preferably set to a range satisfying D ≧ 2.8 × D−1.6 × W1 + 48.0.

Further, in the present invention, the first scan electrode and the second scan electrode
A scan electrode, a connecting portion electrically connecting the first sustain electrode and the second sustain electrode, and connecting the first scan electrode and the second scan electrode, a first sustain electrode and a second sustain electrode, respectively. And a connecting portion for connecting the same are not arranged in the same discharge cell.

Further, according to the present invention, the dielectric layer covering the first scan electrodes and the first sustain electrodes is thicker than the dielectric layer covering the second scan electrodes and the second sustain electrodes. Or the relative dielectric constant of the dielectric layer covering the first scan electrode and the first sustain electrode is smaller than the relative dielectric constant of the dielectric layer covering the second scan electrode and the second sustain electrode, or Alternatively, the first scan electrodes and the first sustain electrodes are made thinner than the second scan electrodes and the second sustain electrodes.

Further, according to the present invention, the discharge is started between the first scan electrode and the first sustain electrode, and the priming effect causes the discharge to be started between the second scan electrode and the second sustain electrode. The discharge that occurs between the second scan electrode and the second sustain electrode starts with the discharge between one of the second scan electrode or the second sustain electrode and the write electrode. Then, the discharge is extended toward the other electrode to perform the sustain discharge.

FIG. 1 shows an embodiment of the present invention.
~ It demonstrates using FIG.

(Embodiment 1) FIG. 1 shows an electrode structure of an AC type plasma display panel according to Embodiment 1 of the present invention, and FIG. 2 is a sectional view taken along a writing electrode 11.
The panel of the present embodiment is characterized by the electrode structure, and the other structure is almost the same as the conventional panel shown in FIG.

That is, in the panel according to the present invention, the front substrate 2 made of glass and the rear substrate 3 made of glass are arranged so as to face each other so as to form a discharge space therebetween. On the surface substrate 2, a plurality of pairs of electrodes composed of scan electrodes and sustain electrodes which are covered with the dielectric layer 6 and are arranged in the row direction with a discharge gap provided therebetween are formed in an array. Has been done.

The scan electrode and the sustain electrode are respectively the first
Scan electrode 41 and second scan electrode 42, and first sustain electrode 51 and second sustain electrode 52 are formed separately. Each electrode is formed using a metal or a transparent electrode. The resistance value of the electrode can be reduced by forming it with a metal electrode,
Since it blocks light emission, it is better to partially use the transparent electrode. In FIG. 1, the first scan electrode 41 and the first sustain electrode 51 are formed of transparent electrodes, and the second scan electrode 42 and the second sustain electrode 52 are metal electrodes 42a and 52a.
However, the combination of the metal electrode and the transparent electrode does not matter. Further, in the cross-sectional view of FIG. 2, the distinction between the transparent electrode and the metal electrode is omitted for easy understanding.

Then, a dielectric layer 6 is formed so as to cover these electrodes, and magnesium oxide (Mg
A protective film 7 made of a material having a high secondary electron emission coefficient such as O) having a high sputter resistance is formed.

On the rear substrate 3, the write electrode 1 extends in the column direction and is orthogonal to the scan electrodes and the sustain electrodes.
1 are arranged in an array, the write electrodes 11 are covered with a dielectric layer 10, and strip-shaped partition walls 8 for separating each write electrode 11 and forming a discharge space are formed on the write electrode 11. It is provided between. A phosphor layer 9 is formed between the adjacent barrier ribs 8 so as to cover the dielectric layer 10 and the side surface of the barrier rib 8. As the phosphor layer 9, phosphor materials of the same color are used in the direction parallel to the writing electrode 11, and phosphor materials of three primary colors are sequentially used in the direction orthogonal to the write electrode 11 in the order of red, green, and blue, for example. ing.

The discharge space is filled with a mixed gas of xenon (Xe) and neon (He) as a discharge gas.

This panel is designed so that the image display can be seen from the surface substrate 2 side which is the display surface side, and the phosphor layer 9 is excited by the ultraviolet rays generated by the discharge in the discharge space and the generated visible light is generated. It is used for display light emission.

That is, in the present invention, the first scan electrode 41
And a second scan electrode 42 and a pair of scan electrodes
1 at a crossing point which is a crossing point between one write electrode 11 and one set of sustain electrodes 51 and second sustain electrodes 52.
One display pixel is formed by forming one discharge cell and making a set of a plurality of discharge cells displaying different colors. It is described that the scan electrode 4 and the sustain electrode 5 are divided into the first scan electrode 41 and the second scan electrode 42, and the first sustain electrode 51 and the second sustain electrode 52, respectively. The second scan electrode 42 and the second sustain electrode 52 play the roles of the electrode 4 and the sustain electrode 5, and the structure of the present invention has the first scan electrode 41 and the first sustain electrode 51 inside them. It is provided. The first scan electrode 41 and the first sustain electrode 51 are the second scan electrode 42 and the second sustain electrode 5, respectively.
2 has a function different from that of the first scan electrode
Since the same potential is applied to the scan electrodes, the first sustain electrodes, and the second sustain electrodes, the scan electrodes 4 and the sustain electrodes 5 are the same.

As is clear from FIG. 2, in the AC type plasma display panel of the related art and the present invention, the electrodes face the discharge space through the dielectric without being exposed to the discharge space. As a result, the potential applied to the electrodes is not applied to the discharge space as it is, but due to the formation of the electric field distribution due to the structure of the discharge space and the discharge cells, the shape is more blunt than that actually applied to the electrodes. Is applied to the discharge space.

For example, the structure shown by the broken line in FIG. 3 has a conventional structure (the arrangement is shown in the lower part of the drawing). When 100 V is applied to the scan electrode 4 and 0 V is applied to the sustain electrode 5, the dielectric is obtained. This is a potential distribution that appears on the surface of the body layer 6 (the surface in contact with the discharge space). The horizontal axis represents the position of the surface of the dielectric layer 6 in the direction along the write electrode 11, where 0 μm is the center of the discharge gap, the positive region is the sustain electrode 5 side, and the negative region is the scan electrode 4 side. According to this, it is understood that the surface potential of the dielectric layer 6 covering the scanning electrodes 4 is lower than 100 V, and that the potential is further lowered near the discharge gap due to the influence of the potential on the sustain electrode 5 side. This characteristic is affected by the thickness of the dielectric layer 6, the dielectric constant, the electrode arrangement, the height of the discharge space, and the like.

In the present invention, the potential actually applied to the discharge space thus appears on the surface of the dielectric layer 6 by paying attention to the characteristic that the potential of the dielectric layer 6 is blunted and devising the electrode structure. By controlling the electric potential, it is possible to realize the control of discharge that has not been heretofore available.

The potential distribution on the surface of the dielectric layer 6 in the present embodiment is shown by the thick solid line in FIG. This characteristic shows the potential distribution when 100 V is applied to the first scan electrode 41 and the second scan electrode 42 and 0 V is applied to the first sustain electrode 51 and the second sustain electrode 52 and the write electrode 11 by electrostatic field simulation. . The arrangement of the electrodes used in the simulation is shown in the upper part of the figure. Even when the applied voltage changes, the same distribution is expected, although the absolute value changes.

First scan electrode 4 in the present embodiment
The electrode widths Wc1, Wc2, Ws1, and Ws2 of the first and second scan electrodes 42, the first sustain electrodes 51, and the second sustain electrodes 52, and the distance Wd between the first scan electrodes 41 and the second scan electrodes 42.
c, the distance Wds between the first sustain electrode 51 and the second sustain electrode 52
Has the values shown in the table. The dielectric layer 6 covering these electrodes has a relative permittivity of 10 and a thickness of 30 μm.

[0040]

[Table 1]

With the structure according to the present embodiment, as shown by the thick line in FIG. 3, the potential on the surface of the dielectric layer 6 on the first scanning electrode 41 and the potential on the surface of the dielectric layer 6 on the second scanning electrode 42. It can be seen that there is a stepwise potential difference between and. The potential difference is about 6V, that is, 6% of the applied voltage difference.
Equivalent to. Accordingly, the first scan electrode 41 and the second scan electrode 42 can be made to function as different electrodes while being given the same potential. More generally, the scan electrode 4 (the first scan electrode 41 and the second scan electrode 42) has a potential Va and the sustain electrode 5 (the first sustain electrode 51 and the second sustain electrode 5).
2) when the potential Vb is applied under the relationship of Va> Vb, the surface of the dielectric layer 6 covering the first scan electrode 41, the second scan electrode 42, the first sustain electrode 51, and the second sustain electrode 52, respectively. Between the potentials Va1, Va2, Vb1, Vb2 of
The relationship of 2>Va1>Vb1> Vb2 can be obtained. Of course, the same applies when the scan electrodes 4 and the sustain electrodes 5 are replaced.

The potential difference can be adjusted by adjusting the electrode width and the electrode interval. The idea will be described below. In the following description, the case where a positive voltage (for example, 100 V) is applied to the first scan electrode and the second scan electrode will be described. The same idea can be applied when a positive voltage is applied to the first sustain electrode and the second sustain electrode.

First, the electrode width of the first scanning electrode 41, which is the electrode closest to the discharge gap, needs to be appropriately thin. By making it thin, the dullness of the potential is increased and the potential is made lower than that of the second scan electrode 42.

FIG. 4 shows the potential of the surface of the dielectric layer 6 near the discharge gap when a voltage of 100 V is applied to the scanning electrode 4 of the conventional structure covered with the dielectric layer 6 (relative permittivity of 10). . It is shown that the discharge gap is set to 40 μm and 60 μm. According to this, even at the position on the scanning electrode 4 in the vicinity of the discharge gap, the electric potential on the surface of the dielectric layer 6 does not rise completely and appears to be dull. For example, when looking at the position of 30 μm from the discharge gap, that is, the position of −60 μm on the curve (solid line) of the discharge gap of 60 μm,
Since the potential still reaches about 92 V, if the discharge gap is set to 60 μm and the width of the first scanning electrode 41 is set to 30 μm in the structure of the present embodiment, the dielectric layer covering the first scanning electrode 41 is formed. The potential of the six surfaces can be estimated to be about 92V, even if estimated high. The potential on the dielectric layer 6 covering the second scan electrode 42 can be set to about 97 V, which is the potential reached at a position apart from the gap in FIG. 4, so that the potential difference is about 5 V. By setting a space between the second scan electrode 42 and the second scan electrode 42, a larger potential difference can be actually obtained.

Next, the first scanning electrode 41 and the second scanning electrode 4
The distance between the two must be a proper distance. If this is too close, the stepwise potential as shown in FIG. 3 is not realized, and the surface potential on the first scanning electrode 41 and the surface potential on the second scanning electrode 42 are continuous, and the effect of the present invention is I can't get it. FIG. 5 shows the width Wc1 of the first scan electrode 41.
And the distance Wd between the first scanning electrode 41 and the second scanning electrode 42.
The electric potential distribution on the dielectric layer 6 when c is changed is shown.
5A, 5B, and 5C, the width Wc1 of the first scan electrode 41 is set to 30 μm, 40 μm, and 50 μm, respectively, and the first scan electrode 41 and the second scan electrode 42 are respectively formed. The interval Wdc is changed. The horizontal axis is Fig. 3,
Similar to FIG. 4, it represents the position on the surface of the dielectric layer 6, and position 0 represents the middle of the discharge gap. The reason that the potential drops far from the discharge gap is that the electrode is
This is because the size is limited to 340 μm. Second scan electrode 42
If you take a wide enough, it will not fall like this,
Actually, such a limit appears due to the influence of the cell pitch.

As shown in FIG. 5, the dielectric layer 6 covering the first scanning electrode 41 and the second scanning electrode 42 as the distance Wdc is increased.
It can be seen that the surface potential of is discontinuous and independent.
In each case, it is considered that the distance Wdc needs to be approximately 80 μm. In addition, the width W of the first scan electrode 41
If c1 is changed, the dielectric layer 6 on the first scan electrode 41 is changed.
It can be seen that the surface potential of the changes. First scan electrode 41
The width Wc1 of the first scan electrode 41 may be made thin if the upper surface potential is to be lowered, and thick if it is to be made high.

This design will of course vary with the dielectric layer 6. This is because the degree of “dullness” of the electric potential changes depending on the capacitance of the dielectric layer 6 per unit area. The capacitance is controlled by the relative permittivity or the film thickness of the material in terms of design. In the following, the film thickness will be discussed, but it is equivalent even if the relative dielectric constant is changed.

While changing the film thickness of the dielectric layer 6, FIG.
The same simulations as in (a), (b), and (c) are performed, and the potentials on the respective first scan electrodes 41 (Va in the figure)
The value of 1) is plotted in FIG. The horizontal axis represents the electrode spacing Wdc, and the vertical axis plots the potential of the surface of the dielectric layer 6 on the first scanning electrode 41. And the dielectric layer 6
And the width Wc1 of the first scanning electrode 41 are changed.

In FIG. 6, each plot shows the electrode spacing W.
Wdc shorter than that is stopped at the shorter dc
In the above, since the potential of the surface of the dielectric layer 6 on the first scanning electrode 41 is continuous with the potential of the surface of the dielectric layer 6 on the second scanning electrode 42, the effect of the present invention cannot be obtained. Is. The curve shown by the dotted line in the figure is a curve showing the limit, and by reading the value under each condition, the range of design values necessary to obtain the effect of the present invention can be obtained. Wdc
At = 0, the potential of the surface of the dielectric layer 6 on the second scan electrode 42 under each condition is shown. It can be seen that as the electrode spacing Wdc becomes smaller, the potential on the surface of the dielectric layer 6 on the first scanning electrode 41 approaches the potential on the surface of the dielectric layer 6 on the second scanning electrode 42.

The film thickness of the dielectric layer 6, the width Wc1 of the first scanning electrode 41, and the required minimum value Wdc-min of the electrode spacing Wdc.
When multiple regression analysis was performed between and, the following relational expression 1 was obtained.

Wdc-min = 2.5 × Ddel−2 × Wc1 + 49.0 (1) That is, the film thickness of the dielectric layer 6 and the width W of the first scanning electrode 41.
The configuration of the present invention can be obtained by designing the three parameters of c1 and the electrode spacing Wdc in a range that satisfies the following Expression 2.

Wdc ≧ 2.5 × Ddel−2 × Wc1 + 49.0 (2) However, the region in the vicinity of the equal sign in the above equation 2 is the first scanning electrode 4
The potential on the surface of the dielectric layer 6 is substantially continuous from 1 to above the second scanning electrode 42, and the effect is small. When the value of Wdc-min that can obtain a clearer effect is obtained again and the necessary Wdc is recalculated, the condition of the above expression 2 becomes the following expression 3
become that way.

Wdc ≧ 2.8 × Ddel−1.6 × Wc1 + 49.0 (3) Therefore, in order to obtain the effect of the present invention, it is necessary to design the parameters of the relation of Expression 2, and more preferably It can be said that the parameters of the relation of Expression 3 are necessary in order to enhance the effect.

By performing an electrostatic field simulation as shown in FIG. 3 within this range, the potential on the surface of the dielectric layer 6 covering the first scanning electrodes 41 can be adjusted to a desired value.

The influences of the distance of the discharge gap, the height of the discharge space (which is adjusted by the height of the barrier ribs 8), the relative permittivity of the material of the dielectric layer 6 and the like, which have been fixed up to this point, cannot be ignored. . With respect to this effect as well, it is possible to perform a design in which the effect of the present invention is obtained by performing a similar electrostatic field simulation.

Next, the discharge mode of this embodiment will be described.

First, the Japanese Patent Laid-Open No. 2001 described in the prior art.
According to Japanese Patent Laid-Open No. 236884, this discharge mode is shown in FIG.
It is realized by the structure shown in FIG. 9A, and the scan electrodes 4 and the sustain electrodes 5 are arranged with a sufficient space therebetween. A schematic diagram of the discharge is shown in FIG. In the structure as shown in FIG. 3A, at the time of sustain discharge, discharge is first started between the scan electrode 4 and the write electrode 11. This discharge erases the wall charges on the phosphor layer 9 and extends toward the sustain electrode 5 while being pulled by the potential on the sustain electrode 5 side. As a result, a long discharge path that crawls near the phosphor layer 9 is realized. Subsequent to this, the roles of the scan electrode 4 and the sustain electrode 5 are exchanged, and the same discharge is generated. As a result, discharge with high luminous efficiency is realized.

There are two reasons why this discharge form exhibits high luminous efficiency. First, the discharge path is long.
In the glow discharge that is generally used for plasma display panels at present, the negative glow part with a large potential gradient and low luminous efficiency does not change its thickness even if the discharge path becomes long. By this, the electric power injection into the positive column portion having a small potential gradient and high UV emission efficiency is increased, and the efficiency is improved.

The other is that the discharge path is near the phosphor, so that the ratio of ultraviolet rays reaching the phosphor increases. An ultraviolet ray source that is generally used in plasma display panels at present is a resonance line of xenon (Xe), but since this is a resonance level, it is absorbed again by Xe particles while propagating in space (self-absorption). It is known that the spatial attenuation is large (for example, Yoshioka et al. IEICE Technical Report EID-99-87, pp.77 (2000)). Therefore, the closer the position where the ultraviolet rays are generated to the phosphor, the higher the luminous efficiency.

In obtaining the discharge form as shown in FIG. 7B, when the discharge is first started between the scan electrode 4 and the write electrode 11, the scan electrode 4 side is the cathode and the write electrode 11 side. It is desirable to apply a drive pulse having a polarity such that the anode is the anode. One is that the discharge starting voltage can be suppressed low by forming a material having a high secondary electron emission coefficient (MgO or the like) on the surface of the dielectric layer 6, and the other is that The point is to prevent deterioration of the phosphor layer 9 due to ion bombardment by causing the phosphor layer 9 side to always act as an anode.

However, this conventional structure has the above-mentioned problems. That is, the driving voltage is higher than that of the conventional structure. A higher voltage is required for discharging a long path, but in the above-mentioned conventional technique, the voltage rise is suppressed by discharging it through the write electrode 11. However, even if the discharge is started between the scan electrode 4 and the write electrode 11, the voltage is required because the distance to the sustain electrode 5 for extending the discharge is long after that.

On the other hand, the Society for Information Display 'is a technology that is devised so that the voltage does not rise while realizing a similar discharge form.
00 ・ Digest pages 106-109 (Sche
merhorn et. al, SID'00 Dige
st pp. 106-109), and Japanese Patent Laid-Open No.
There is a technique disclosed in JP-A No. 01-210243. This configuration is shown in FIG. This configuration is in addition to the conventional configuration described above,
A trigger electrode is provided in the central portion of the discharge cell. By generating a trigger discharge between the trigger electrodes 14 and 15, priming particles are generated, and the priming effect induces discharge of a long path at a low voltage.

However, in such a configuration, the trigger electrode arranged in the central portion of the discharge cell must be supplied with another potential different from those of the scan electrode 4 and the sustain electrode 5, which is a scale of the drive circuit. Not only is the number increased, but the number of lead-out terminals is doubled at the connection between the panel and the drive circuit, which makes it more difficult to make a high-definition panel.

The structure according to the present invention controls the voltage applied in the discharge cell by devising the electrode,
While applying the same potential to each of the scan electrode 41 and the second scan electrode 42 and the first sustain electrode 51 and the second sustain electrode 52, another potential is applied to the first scan electrode 41 and the first sustain electrode 51 as if they were trigger electrodes. The above effect can be obtained, and a specific driving method will be described later.

Further, in the present invention, each electrode has a particularly thin first scanning electrode 41 and a first sustaining electrode so as not to affect the characteristics of the panel when an unexpected disconnection occurs due to a manufacturing trouble. The first scan electrode 41, the second scan electrode 42, and the first scan electrode 41 are arranged so that the resistance value of the electrode 51 does not increase.
It is preferable to provide a portion for electrically connecting sustain electrode 51 and second sustain electrode 52 as appropriate. However, it is necessary to prevent the effects of the present invention from being impaired by the presence of this connecting portion. For example, when a connecting portion that connects the first scanning electrode 41 and the second scanning electrode 42 is provided, the electrode interval W is provided near the connecting portion.
Since there is no dc, the potential on the dielectric layer 6 covering the first scan electrode 41 is continuous with the potential on the dielectric layer 6 covering the second scan electrode 42.

Therefore, it is desirable to provide as few connecting portions as possible, that is, on the partition walls 8 and other portions that do not face the discharge spaces of the discharge cells. Originally, the presence of the partition wall 8 has an effect that the dielectric layer 6 is locally thickened in the vicinity of the partition wall 8, the potential of the surface is lowered, and the vicinity of the partition wall 8 is affected by the wall surface loss of plasma. , Electric discharge is hard to occur. Therefore, the effect of the present invention can be maintained by forming the connecting portion so as to overlap the partition wall 8.

In addition, the first scanning electrode 41 and the second scanning electrode 4
In order to minimize the influence of the connection portion, the connection portion with 2 should not be formed in the same discharge cell as the connection portion between the first sustain electrode 51 and the second sustain electrode 52.

Here, there are some examples of the constitution itself of dividing the electrodes before the present invention. For example, the electrode may be divided in parallel with the longitudinal direction of the electrode.

In this conventional structure, the discharge current is reduced by dividing the electrodes, and the luminous efficiency is improved. Here, it is assumed that the same voltage is applied to the divided electrodes and the same potential is applied to the discharge space. The effect of power reduction by dividing the electrodes is
The discharge appears when a conventional surface discharge is performed, and for that purpose, the discharge needs to smoothly move between the divided electrodes. This is also apparent from the fact that the first peak is dominant in the current waveform, and the effect of the change with the potential on the dielectric layer 6 covering the second scan electrode 42 as in the present invention can be obtained. Absent.

That is, according to the present invention, not only the electrodes are divided, but also the thickness of the dielectric layer, the width of each electrode, and the interval are set to appropriate values to obtain the action and effect.

Next, a method of driving the panel of this embodiment will be described with reference to FIG.

The driving method of the present invention is the same as the conventional method.
The subfield method can be used. In the subfield method, one field is divided into a plurality of subfields, a predetermined number of pulses are applied to each subfield to represent different brightness, and further gradation is represented by a combination thereof. . In the following description, an example of the driving method in each subfield will be shown.

In the present invention, the first scan electrode 41 and the second scan electrode 42, the first sustain electrode 51 and the second sustain electrode 5 are used.
2. Further, it can be considered as a method of driving by using five kinds of electrodes of the writing electrode 11. However, the second scan electrode 42 and the second sustain electrode 52 are the same as the first scan electrode 4 respectively.
The voltage applied to the first and first sustain electrodes 51 needs to be equal.

To facilitate understanding, the first scanning electrode 4
The voltage waveforms applied to the first and second scan electrodes 42 are collectively shown in FIG. 9A as the voltage waveforms applied to the scan electrode 4, and the voltage waveforms applied to the first sustain electrode 51 and the second sustain electrode 52 are shown in FIG. 9B shows the voltage waveforms applied to the sustain electrodes 5 collectively.

In FIG. 9A, the voltage waveforms applied to the scan electrodes of the first scan electrode 41 and the second scan electrode 42 are indicated by solid lines, and the dielectric layers on the first scan electrode 41 and the second scan electrode 42 are shown. The potentials due to the wall charges on the six surfaces are shown by a broken line and a dashed line, respectively. Similarly, in FIG. 9B, the first sustain electrode 51 is formed.
The voltage waveform applied to the sustain electrodes of the second sustain electrode 52 is indicated by a solid line on the first sustain electrode 51 and the second sustain electrode 52.
The potentials due to the wall charges on the surface of the upper dielectric layer 6 are shown by a broken line and a dashed line, respectively.

FIG. 9 (c) schematically shows the voltage waveform applied to the write electrode 11, and FIG. 9 (d) schematically shows the ultraviolet light emission waveform due to discharge. The potentials due to the wall charges are shown with their polarities reversed. Therefore, the difference between the applied voltage and the potential due to the wall charge represents the voltage applied to the cell. Further, the wall charges are those of the discharge cells in which the writing discharge has occurred.

The same waveform of FIG. 9A is applied to the first scanning electrode 41 and the second scanning electrode 42. However, as described above, the surface of the dielectric layer 6 covering each electrode is applied. The potential is different when viewed. It can be considered that the waveform of FIG. 9A changes in a similar manner at a rate corresponding to the panel design. That is, the potential of the surface of the dielectric layer 6 that covers the first scan electrode 41 and the potential of the surface of the dielectric layer 6 that covers the second scan electrode 42 are similar-transformed with respect to the waveform of FIG. It is considered to be a thing. Obviously, the wall charge value is considered to be similarly deformed at the same ratio, but for simplicity, it is described here as a value corresponding to the applied voltage. The same applies to the sustain electrodes 5.

What is necessary for driving the panel of the present invention is that the first scan electrode 41, the second scan electrode 42, the first sustain electrode 51, and the second sustain electrode 52 have the following characteristics. It is that.

Conventionally, when considering discharge for driving a plasma display panel, strong discharge in which wall charges move so as to completely cancel an applied voltage and weak discharge in which wall charges gradually move while maintaining a discharge start voltage. Consider two types. The second scan electrode 42 and the second sustain electrode 52 of the present invention are
Since they are located far from each other, the wall charges cannot move in the weak discharge. In other words, the wall charges move only during strong discharge.

Therefore, during weak discharge using a ramp waveform or the like, the wall charge is adjusted only between the first scan electrode 41 and the first sustain electrode 51, while strong discharge causes The wall charges of the second scan electrode 42 and the second sustain electrode 52 also change. As a result, the wall charges change as shown in FIGS. 9A and 9B.

Next, the driving method will be specifically described. First, at time t1, a positive voltage is applied to the sustain electrodes and a negative voltage is applied to the scan electrodes to cause discharge. Then, negative wall charges are formed on dielectric layer 6 covering first sustain electrode 51 and second sustain electrode 52. In addition, the first scan electrode 4
Positive wall charges are formed on the dielectric layer 6 covering the first and second scan electrodes 42.

Next, the first scan electrode 4 is formed by using the inclined waveform.
1. Adjust the wall charge on the surface of the dielectric layer 6 on the first sustain electrode 51. Here, the second scan electrode 42 and the second sustain electrode 52
Cannot discharge because it is far from the discharge gap. When a weak discharge is generated by using the ramp waveform, the wall charge can be adjusted on the surface of the dielectric layer 6 covering the first scan electrode 41 and the second sustain electrode 52 in a state close to the discharge start voltage. The wall charge is adjusted at the next time t3.
The voltage is set so that writing discharge occurs.

At time t3, a scanning pulse is applied to the scanning electrode and a writing pulse is applied to the writing electrode 11. The scan pulse corresponds to removing the bias voltage Vscan applied to the scan electrode of the row in which writing is not performed. Since the bias voltage Vscan is applied to the polarity for stopping the discharge, the write discharge does not occur in the row to which the scan pulse is not applied. The write discharge changes the wall charges on the surface of the dielectric layer 6 on the first scan electrodes 41 and the first sustain electrodes 51. Positive wall charges are formed on the surface of the dielectric layer 6 on the first scan electrode 41 where the writing discharge has occurred, and negative wall charges are formed on the surface of the dielectric layer 6 on the first sustain electrode.

This writing discharge occurs only between the first scan electrode 41 and the first sustaining electrode 51, and the spatial spread is small, so that the current accompanying the writing discharge is small and the discharge to the adjacent cell is also made. There is also an advantage that so-called crosstalk discharge, which is affected by, is unlikely to occur.

By this writing discharge, positive wall charges are both applied on the dielectric layer 6 covering the first scan electrode 41 and the second scan electrode 42, and a dielectric covering the first sustain electrode 51 and the second sustain electrode 52. Negative wall charges are formed on the layer 6 together, and then a sustain discharge can be performed. In the discharge cell in which the write discharge has not occurred, the sustain discharge cannot be started because the potential on the dielectric layer 6 covering the first scan electrode 41 and the first sustain electrode 51 is not appropriate.

At time t4, the potential of scan electrode 4 is raised to sustain voltage Vsus, and the potential of sustain electrode 5 is grounded. As a result, the negative wall charges on the surface of the dielectric layer 6 on the first sustain electrode 51 and the second sustain electrode 52, and the first sustain electrode
Sustain discharge is generated by using the positive wall charges on the surface of the dielectric layer 6 on the scan electrode 41 and the second scan electrode 42. The sustain discharge is performed by the first sustain electrode 51 and the first scan electrode 4 as described above.
The discharge between the second sustain electrode 52 and the write electrode 11 is extended toward the second scan electrode 42 by using the discharge between the first sustain electrode 52 and the write electrode 11 as a trigger. At this time, it should be noted that the second sustain electrode 52 works as a cathode.

The operation of the sustain discharge is continued a predetermined number of times while reversing the roles of the scan electrode and the sustain electrode, and the last is the sustain discharge that occurs when the scan electrode side is grounded. Since the arrangement of the wall charges at this time is almost the same as the state at the time t2, the operation at the time t1 is not necessary in the next subfield, and the operation may be started after the time t2 (time t2 ′ in the figure). ). The discharge at the time t1 occurs regardless of the presence or absence of display, and therefore reduces the contrast. Therefore, by reducing the number of discharges once per field, it is possible to prevent a decrease in contrast.

In the above description, an example of a driving method that makes the best use of the characteristics of the panel of the present invention is shown. However, the driving method is as shown in FIG. 9 as long as the effects of the present invention can be obtained. Not limited to In particular, other driving methods can be considered for the potential relationship at the time of writing discharge and the initialization waveform from t1 to t3.

In this embodiment, the first scan electrode 41 and the first sustain electrode 51 are transparent electrodes in FIG.
The second scan electrode 42 and the second sustain electrode 52 are formed by a combination of the transparent electrode and the bus electrode made of metal, but the combination of the transparent electrode and the metal electrode is not limited to this, and the first scan electrode 41 and the first sustain electrode 51. May be formed of a metal electrode.

In addition, the second scan electrode 42 and the second sustain electrode 5
2 may be further divided to incorporate the effect of power reduction, but in that case, the second scan electrode 42 and the second sustain electrode 5 are used.
In order to prevent the potential of the second scanning electrode 41 and the first sustaining electrode 51 from being blunted, it is necessary to prevent the space between the divided portions from becoming unnecessarily large.

(Second Embodiment) FIG. 10 shows an electrode structure of a plasma display panel according to a second embodiment of the present invention. In the present embodiment, in order to make the potentials that appear on the surface of the dielectric layer 6 that covers the first scan electrode 41 and the second scan electrode 42 and the first sustain electrode 51 and the second sustain electrode 52 different, The thickness of the body layer 6 is changed.
Since the thickness of the dielectric layer 6 covering the first scan electrode 41 is larger than the thickness of the dielectric covering the second scan electrode 42,
The electric potential on the dielectric layer 6 changes.

Similar to the first embodiment, first scan electrode 41 and second scan electrode 42, first sustain electrode 51 and second sustain electrode 5 are formed.
The same voltage is applied to 2 respectively. The effect of the present embodiment is similar to the effect of the first embodiment, and the driving method can be the same method as the first embodiment.
It should be noted that, when combined with the electrode design described in the first embodiment, the design latitude is further expanded.

(Embodiment 3) FIG. 11 shows an electrode structure of a plasma display panel according to Embodiment 3 of the present invention. In the present embodiment, in order to make the potentials that appear on the surface of the dielectric layer 6 that covers the first scan electrode 41 and the second scan electrode 42 and the first sustain electrode 51 and the second sustain electrode 52 different, The relative dielectric constant of the body layer 6 is changed. Since the relative dielectric constant of the dielectric layer 6 covering the first scanning electrode 41 is smaller than the relative dielectric constant of the dielectric covering the second scanning electrode 42, the potential on the dielectric layer 6 changes. .

Similar to the first and second embodiments, the first scanning electrode 4
The same voltage is applied to the first and second scan electrodes 42 and the first and second sustain electrodes 51 and 52, respectively. The effect of the present embodiment is similar to the effect of the first embodiment, and the driving method can be the same method as the first embodiment. When combined with the electrode design described in the first embodiment and the dielectric thickness design described in the second embodiment, the design margin can be further expanded.

(Embodiment 4) FIG. 12 shows an electrode structure of a plasma display panel according to Embodiment 4 of the present invention. In the present embodiment, in order to make the potentials that appear on the surface of the dielectric layer 6 covering the first scan electrode 41 and the second scan electrode 42 and the first sustain electrode 51 and the second sustain electrode 52 different, respectively, the electrodes are made different. The thickness of is changed. Since the thickness of the first scanning electrode 41 is made smaller than the thickness of the second scanning electrode 42, the potential on the dielectric layer 6 changes. In order to change the thickness of each electrode, it is desirable to use a thick film forming method such as a printing method for the second scan electrode 42 and the second sustain electrode 52 which are formed relatively thick.

In this embodiment, the same voltage is applied to the first scan electrode 41 and the second scan electrode 42, and the first sustain electrode 51 and the second sustain electrode 52, as in the first and second embodiments. It The effects of this embodiment are similar to those of the first embodiment, and the method described in the first embodiment can be applied to the driving method. When combined with the electrode design described in the first embodiment and the dielectric design described in the second and third embodiments, the design latitude is further expanded.

[0097]

As described above, according to the present invention, the scan electrode and the sustain electrode are divided into the first scan electrode and the second scan electrode, respectively, and the sustain electrode is divided into the first sustain electrode and the second sustain electrode.
The electric potential of the dielectric surface covering each electrode is different according to a predetermined relationship, so that discharge control can be performed as if using four parallel electrodes without complicating the structure. Therefore, it is possible to provide a plasma display panel with high luminous efficiency by realizing discharge with a long path and high luminous efficiency.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram for explaining an electrode structure of a plasma display panel according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is an explanatory diagram showing a potential distribution on a dielectric surface in the present invention and a conventional structure.

FIG. 4 is a characteristic diagram showing a potential of a dielectric surface in a conventional structure.

FIG. 5 is a characteristic diagram showing the relationship between the design value and the potential distribution on the dielectric surface in the first embodiment of the present invention.

FIG. 6 is a characteristic diagram showing the relationship between the potential of the dielectric surface on the first scanning electrode and each design value in the present invention.

FIG. 7A is a cross-sectional view showing a structure for causing discharge in a long path in a conventional example, and FIG. 7B is a schematic view showing discharge in a long path in the conventional example.

FIG. 8 is a cross-sectional view showing a structure including a trigger electrode in a conventional example.

FIG. 9 is a signal waveform diagram for explaining an example of the driving method of the plasma display panel of the present invention.

FIG. 10 is a sectional view showing an electrode structure of a plasma display panel according to a second embodiment of the present invention.

FIG. 11 is a sectional view showing an electrode structure of a plasma display panel according to a third embodiment of the present invention.

FIG. 12 is a sectional view showing an electrode structure of a plasma display panel according to a fourth embodiment of the present invention.

FIG. 13 is a perspective view showing a structure of a conventional plasma display panel.

FIG. 14 is a schematic configuration diagram showing an electrode structure of a conventional panel.

FIG. 15 is a signal waveform diagram showing an example of a conventional plasma display panel driving method.

[Explanation of symbols]

1 panel 2 front substrate 3 back substrate 4 scanning electrodes 5 sustaining electrodes 6 Dielectric layer 7 protective layer 8 partitions 9 Phosphor layer 10 Dielectric layer 11 Writing electrode 41 first scan electrode 42 Second scan electrode 51 First sustaining electrode 52 Second sustain electrode

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yusuke Takada             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 5C040 FA01 FA04 GB03 GB14 GC02                       GC11 LA10 LA12 LA14 MA03                       MA12

Claims (12)

[Claims] 1. A first substrate formed by arranging scan electrodes and sustain electrodes with a discharge gap provided therebetween and forming a dielectric layer so as to cover the scan electrodes and sustain electrodes, and the first substrate. The substrate has a second substrate which is opposed to the substrate so as to form a discharge space between the substrate and a write electrode, and a discharge cell is provided at an intersection of the scan electrode and the sustain electrode with the write electrode. In the formed plasma display panel, the scan electrode is divided into a first scan electrode and a second scan electrode from a portion closer to the discharge gap, and the sustain electrode is first sustained than a portion closer to the discharge gap. An electrode and a second sustain electrode are divided and the same potential Va is applied to the first scan electrode and the second scan electrode, and the same potential Vb is applied to the first sustain electrode and the second sustain electrode Va> Vb. Of the dielectric layer covering the first scan electrode, the potential Va1 of the surface of the dielectric layer covering the first scan electrode, the potential Va2 of the surface of the dielectric layer covering the second scan electrode, and the dielectric layer covering the first sustain electrode. Between the surface potential Vb1 and the surface potential Vb2 of the dielectric layer covering the second sustain electrode, V
A plasma display panel, characterized in that the relationship of a2>Va1>Vb1> Vb2 is obtained. 2. A potential Va is applied to the first scan electrode and the second scan electrode.
2. The plasma display panel according to claim 1, wherein the potential distribution on the dielectric surface has an inflection point between the first scanning electrode and the second scanning electrode when given. . 3. The potential Vb is applied to the first sustain electrode and the second sustain electrode.
2. The plasma display according to claim 1, wherein the electric potential distribution on the surface of the dielectric body has an inflection point between the first sustain electrode and the second sustain electrode when given. panel. 4. The plasma according to claim 1, wherein the first scan electrode is provided with a width narrower than that of the second scan electrode and at a constant interval in parallel with the second scan electrode. Display panel. 5. The plasma according to claim 1, wherein the first sustain electrode has a width narrower than that of the second sustain electrode and is provided in parallel with the second sustain electrode with a constant interval. Display panel. 6. The distance between the first scan electrode and the second scan electrode and the distance between the first sustain electrode and the second sustain electrode are set to W.
When the width of the first scan electrode and the first sustain electrode is W1 and the thickness of the dielectric layer is D, Wdc ≧ 2.5.
The plasma display panel according to claim 1, wherein the plasma display panel is configured to satisfy a relationship of xD-2xW1 + 48.0. 7. The distance between the first scan electrode and the second scan electrode and the distance between the first sustain electrode and the second sustain electrode are W.
When the width of the first scan electrode and the first sustain electrode is W1 and the thickness of the dielectric layer is D, Wdc ≧ 2.8.
The plasma display panel according to claim 1, wherein the plasma display panel is configured to satisfy a relationship of xD-1.6xW1 + 48.0. 8. The plasma display panel according to claim 1, wherein the first scan electrode and the second scan electrode, and the first sustain electrode and the second sustain electrode are electrically connected to each other. 9. A structure in which a connection portion connecting the first scan electrode and the second scan electrode and a connection portion connecting the first sustain electrode and the second sustain electrode are not arranged in the same discharge cell. The plasma display panel according to claim 8, wherein: 10. The film thickness of the dielectric layer covering the first scan electrodes and the first sustain electrodes is thicker than the film thickness of the dielectric layer covering the second scan electrodes and the second sustain electrodes. The plasma display panel according to claim 1. 11. The dielectric constant of a dielectric layer covering the first scan electrode and the first sustain electrode is smaller than the dielectric constant of a dielectric layer covering the second scan electrode and the second sustain electrode. The plasma display panel according to claim 1, wherein: 12. The plasma display panel according to claim 1, wherein the first scan electrodes and the first sustain electrodes have a thickness smaller than that of the second scan electrodes and the second sustain electrodes.