JPH11297209A - Plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plasma display panel capable of discharging with a low voltage in a discharge space. SOLUTION: This plasma display panel is provided with a front board 11 and a back board 21 to form a discharge space 30 composed of multiple discharge cells, display electrodes X, Y formed in parallel with each other interposing a gap region Z on the back board 21 side of the front board 11, and dielectric layers 17x, 17y covering at least the back board side of the display electrodes X, Y; and the dielectric layers 17x, 17y present a recessed part in the gap region Z in the discharge cells.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a plasma display (hereinafter, referred to as a PDP), and to a structure of a discharge cell.

[0002]

2. Description of the Related Art FIG.
Patent Document 9 discloses a conventional AC type three-electrode surface discharge type PD.
It is a perspective view which shows the structure of P. 11 is a front substrate, X and Y
Is a display electrode disposed on the surface of the front substrate 11, 17 is a dielectric layer covering the display electrodes X and Y, 18 is a protective layer of MgO or the like covering the surface of the dielectric layer 17, 21 is a rear substrate, 22 is a rear surface. Address electrodes arranged on the substrate 21, 30 is a discharge space of a discharge cell, 28 is a phosphor provided in the discharge space 30,
29 is a partition for partitioning the discharge cell, 41 is a strip-shaped transparent electrode film (hereinafter, referred to as a transparent electrode) made of a tin oxide-based material,
42 is Cr-Cu-C for supplementing the conductivity of the transparent electrode 41
r, a strip-shaped metal film (hereinafter, referred to as a metal electrode) composed of a multilayer film of Cr—Al—Cr, etc.
EU is a protective layer covering the address electrodes 22, EU is a unit light emitting region emitting red (R), green (G) or blue (B) light, and EG is a pixel composed of three unit light emitting regions EU.

FIG. 13A is a plan view of the PDP shown in FIG. However, to avoid complication, the front substrate 1
1 illustrates a portion existing between the protective layer 51 and the protective layer 51. The dielectric layer 17 and the protective layer 18 are provided on the entire surface of the region illustrated in FIG. FIG. 13B shows FIG.
2 shows a section taken along section line XIII-XIII of FIG. In FIG. 12, the partition wall 29 and the protective layer 18 are drawn apart for easy understanding, but they are actually in contact (FIG. 13B).

The display electrodes X and Y are constituted by a transparent electrode 41 and a metal electrode 42 additionally provided thereon. The transparent electrodes 41 of the display electrodes X and Y are arranged in parallel with each other with a gap region Z having a predetermined length (discharge gap).

The partition 2 provided between the protective layers 18 and 51
9 defines the height of the discharge space 30 and the discharge space 30
Are partitioned in a stripe shape along the extending direction of the display electrodes X and Y. The discharge space 30 is filled with a mixed gas of a rare gas such as Xe and Ne as a discharge gas.

By applying an AC pulse voltage between the display electrodes X and Y, a discharge is generated in the discharge space 30 and the light emission of the discharge cells is maintained. This discharge is caused by the discharge gas X
e atoms are excited, and resonance vacuum ultraviolet rays (wavelength: 147 n
m). The ultraviolet light is emitted in all directions, and a part of the ultraviolet light reaches the phosphor 28. Part of the ultraviolet light that has reached the phosphor 28 is absorbed by the phosphor 28. Phosphor 2
The ultraviolet light absorbed by 8 excites the phosphor 28 and is converted into visible light of red (R), green (G), and blue (B) according to the type of the phosphor 28.

It is known that the dielectric layer 17 plays a role of limiting an alternating current flowing between the display electrodes X and Y and enabling discharge even if a pulse voltage applied to the display electrodes X and Y is low. Have been.

[0008]

However, in the conventional three-electrode surface discharge type PDP, the dielectric layer 17 covers the display electrodes X and Y, and the discharge space 30 extends from the gap region Z to the thickness of the dielectric layer 17. It is in a position shifted by just that. Therefore, the potential difference in the discharge space 30 is lower than the pulse voltage applied to the display electrodes X and Y, and the electric field strength in the discharge space 30 is weaker than that in the gap region Z. Therefore, the conventional three-electrode surface discharge type PDP requires a higher pulse voltage to generate a discharge in the discharge space 30 as compared with, for example, a conventional opposed discharge type PDP in which a discharge space is interposed between two electrodes. There was a problem.

The present invention has been made to solve this problem, and an object of the present invention is to provide a PDP capable of discharging at a low voltage in a discharge space.

[0010]

According to a first aspect of the present invention, there is provided a first and a second substrates which are opposed to each other to form a discharge space comprising a plurality of discharge cells; On the second substrate side of the substrate, first and second electrodes formed in parallel with each other with a gap region interposed therebetween, and a dielectric covering at least the second substrate side of the first and second electrodes. Wherein the dielectric has a concave portion at least in the gap region in the discharge cell.

[0011] In the means for solving problems according to claim 2 of the present invention, the dielectric is provided over the plurality of discharge cells, and the recess is a single groove extending over the plurality of discharge cells.

[0012] The problem solving means according to claim 3 of the present invention is:
And a partition provided on the first substrate side of the second substrate to partition the plurality of discharge cells, wherein the first and second electrodes are arranged in each of the plurality of discharge cells more than in the partition. It has a protrusion extending into the recess.

[0013] The problem solving means according to claim 4 of the present invention is as follows.
The apparatus further includes a partition provided on the first substrate side of the second substrate to partition the plurality of discharge cells, and the recess is separated from the discharge cells by the partition.

According to a fifth aspect of the present invention, the bottom of the recess is the first substrate.

In a sixth aspect of the present invention, the bottom of the concave portion is inside the first substrate.

According to another aspect of the present invention, the bottom of the concave portion is inside the dielectric.

[0017] In the means for solving problems according to claim 8 of the present invention, the dielectric also covers the first substrate side of the first and second electrodes, and the bottom of the concave portion is connected to the first substrate. Between the first and second electrodes.

According to a ninth aspect of the present invention, the distance from the first and second electrodes to the surface of the dielectric is longer as the distance from the concave portion increases.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 An AC three-electrode surface-discharge PDP according to the first embodiment will be described.
The three-electrode surface discharge type PDP of the first embodiment has the same structure as that shown in FIG.
The difference is that 7x and 17y are provided.

FIG. 1 shows the structure of an AC type three-electrode surface discharge type PDP in the first embodiment. FIGS. 1 (a) and 1 (b) are plan views corresponding to FIGS. 13 (a) and 13 (b), respectively. FIG. In the figure, reference numeral 19 denotes a concave portion.

The concave portion 19 has a shape defined by the surface of the dielectric layer 17, and is not defined by the protective layer 18. For example, it can be said that the bottom of the recess 19 is the front substrate 11.

The dielectric layers 17x and 17y surround the display electrodes X and Y together with the front substrate 11, but are separated from each other at the concave portion 19. That is, the concave portion 19 forms a part of the dielectric layer 17 located in the gap region Z with the display electrodes X,
Y is obtained by being omitted so as not to be exposed.

In the first embodiment, the concave portion 19 is a single linear groove extending over a plurality of discharge cells, as shown in FIG. Since the concave portion 19 communicates with the discharge space 30, the discharge space 30 protrudes into the gap region Z.

The protective layer 18 is made of MgO having a thickness of, for example, less than 1 μm, and includes dielectric layers 17 x and 17 y and concave portions 19.
Is added to the exposed surface of the front substrate 11 and is very thin as compared with the dielectric layer 17 having a thickness of, for example, 10 μm or more.

Next, the operation will be described. Discharge space 30
To generate a discharge, and apply a pulse voltage between the display electrodes X and Y to maintain the light emission of the discharge cells. The pulse voltage is substantially divided by the dielectric layers 17x and 17y and the concave portion 19 in the gap region Z. The relative permittivity of the dielectric layers 17x and 17y is, for example, about 13, which is considerably larger than the relative permittivity of the discharge gas in the concave portion 19 (= 1). Therefore, most of the pulse voltage is applied to the concave portion 19,
The potential difference in the concave portion 19 is substantially equal to the pulse voltage applied to the display electrodes X and Y. Moreover, the electric field strength in the concave portion 19 is
Stronger than the discharge space 30 other than the recess 19. As a result, the discharge starts in the concave portion 19 at a lower pulse voltage than in the conventional case without the concave portion 19.

The concave portion 19 of the first embodiment can be obtained by using the following method. That is, using the screen printing method, the dielectric layer 17
x, 17y, a method of once forming the dielectric layer 17 uniformly over the entire surface, and then removing the portion that becomes the concave portion 19 by using sandblasting or the like, a method of uniformly forming the dielectric layer over the entire surface For example, a method in which a concave portion 19 is provided by performing a mechanical press on 17.

As described above, by covering the display electrodes X and Y with the dielectric layers 17x and 17y separated in the gap region Z, respectively, the concave portions 19 communicating with the discharge space 30 are provided, so that the pulse which is lower than the conventional one is obtained. It can be discharged by voltage.

Further, since a low pulse voltage is required, the cost of the drive circuit for generating the pulse voltage can be reduced, the loss in the drive circuit can be reduced, and the electromagnetic noise can be reduced.

A method of increasing the pressure of the discharge gas in order to increase the luminous efficiency is known. However, in this method, it is necessary to increase the pulse voltage according to Paschen's law in order to discharge the discharge space 30. There is. On the other hand, according to Embodiment 1, even if the pressure of the discharge gas is increased in order to increase the luminous efficiency, the provision of the concave portion 19 does not require a high pulse voltage.

Further, in the first embodiment, since the concave portion 19 is a single groove extending over a plurality of discharge cells, it is easy to form the dielectric layer 17 provided with the concave portion 19.

Further, the concave portion 19 can be formed while forming the dielectric layers 17x and 17y by using a screen printing method.

Embodiment 2 FIG. In the first embodiment,
Since the recess 19 forms a single groove and extends over a plurality of discharge cells, the discharge spaces 30 of adjacent discharge cells communicate with each other through the recess 19, and the discharge in one discharge space 30 affects the adjacent discharge space 30. May give.

The second embodiment is characterized by the shapes of the display electrodes X and Y. The other parts are the same as those in the first embodiment, and a description thereof will be omitted.

FIG. 2 is a plan view showing an example of the configuration of the second embodiment, and corresponds to FIG. FIG. 2B shows FIG.
FIG. 2A is a cross-sectional view taken along section line IIb-IIb. FIG.
FIG. 3 shows a cross section taken along line III-III in FIG.

In the structure shown in FIGS. 2 and 3, the display electrodes X and Y have a rectangular shape in which a transparent electrode 41 is provided for each discharge cell. The dimension L1 of the transparent electrode 41 along the direction in which the concave portion 19 extends is shorter than the distance between the adjacent partition walls 29.

The transparent electrode 41 may have the structure shown in FIGS. 4 corresponds to FIG. 2, and FIGS. 4 (b) and 5 respectively show cutting lines IVb-IVb and cutting lines in FIG. 4 (a).
It is sectional drawing in VV. In the structure shown in FIG. 4 and FIG.
Partition wall 29 whose dimension L2 along the direction in which
Is smaller than the distance between the metal electrodes 4 of the transparent electrode 41.
The two sides may straddle a plurality of discharge cells.

Alternatively, the transparent electrode 41 may have a structure shown in FIG. FIG. 6 corresponds to FIG.
5 and 4 show cross sections taken along Q and PP, respectively.
Appears as in (b). In the structure shown in FIG. 6, if the dimension L3 along the direction in which the concave portion 19 extends at the end of the transparent electrode 41 on the concave portion 19 side is shorter than the distance between the adjacent partition walls 29, the concave portion of the transparent electrode 41 The shape on the 19 side may be trapezoidal.

As described with reference to FIGS. 2 to 6, the display electrodes X and Y of the second embodiment have rectangular or trapezoidal projections extending toward the recess 19 side. The periphery of the partition wall 29 is cut out.

Since the display electrodes X and Y have protrusions and are cut out around the partition 29 in the recess 19, the electric field strength in the recess 19 around the partition 29 is lower than that of the display electrodes X and Y. It is weaker than the electric field strength of the concave portion 19 between them. Accordingly, discharge does not occur in the concave portion 19 around the partition wall 29, and even though the concave portion 19 has a groove shape, the charge generated by the discharge is prevented from entering the adjacent discharge cell.

As described above, since the charge generated by the discharge is prevented from entering the adjacent discharge cell through the groove-shaped concave portion 19, the influence of the discharge of one discharge cell on the adjacent discharge cell is suppressed. And stable driving can be realized. In the first embodiment, it is possible to prevent the discharge of one discharge cell from affecting the next discharge cell by limiting the voltage range of the pulse voltage, for example. Can be widened.

Embodiment 3 FIG. 7 shows the structure of an AC type three-electrode surface discharge type PDP in the first embodiment.
1A and 1B are a plan view and a sectional view corresponding to FIGS. 1A and 1B, respectively. FIG. 7B is a cross-sectional view taken along section line VIIb-VIIb in FIG. The third embodiment is characterized by the concave portion 19, and the other features are the same as those of the first embodiment, so that the description is omitted.

The recesses 19 according to the third embodiment are separated from each other by the barrier ribs 19 for each discharge cell, and have a dimension to fit between the adjacent barrier ribs 29. In each discharge cell, the dielectric layer 17 surrounds the recess 19 in each discharge cell. It is an enclosed hole. Therefore, the cross section taken along the line XIIIb-XIIIb of FIG. 7A is the same as that of FIG. 13B, there is no gap between the partition wall 29 and the protective layer 18, and the discharge spaces 30 of the adjacent discharge cells are connected. Not.

As described above, since the discharge spaces 30 of the adjacent discharge cells are not connected to each other, the discharge of one discharge cell does not affect the adjacent discharge cell as in the related art, and stable driving is realized. it can.

Embodiment 4 FIG. The fourth embodiment is characterized by the depth of the concave portion 19 as shown in FIG. The other parts are the same as those in the first to third embodiments, and thus the description is omitted.

In the fourth embodiment, the bottom of the concave portion 19 is inside the front substrate 11, and the concave portion 1 is located between the display electrodes X and Y.
There is a discharge space 30 communicating with 9. That is, the discharge space 30 penetrates the gap region Z. The display electrodes X and Y are similar to so-called parallel plate electrodes, and the electric field intensity is distributed almost uniformly in the concave portion 19. Therefore, if the structure shown in FIG. 8 is applied, the electric field intensity in the entire concave portion 19 is further increased.

In the recess 19 of the fourth embodiment, for example, a portion that becomes the recess 19 and the surface of the front substrate 11 are removed by using sand blast or the like on the dielectric layer 17 uniformly formed on the entire surface of the front substrate 11. This can be provided on the dielectric layer 17.

As described above, since the electric field intensity of the entire concave portion 19 is further increased, discharge can be performed with a lower pulse voltage. Of course, the concave portion 19 may have a groove shape as in the first embodiment, or may have a hole shape as in the third embodiment.

Embodiment 5 FIG. Embodiment 5 is also characterized by the depth of the concave portion 19 as shown in FIG. Other parts are the same as those in the first to third embodiments.
Description is omitted.

The recess 19 of the fifth embodiment is shallow, and has a bottom inside the dielectric layer 17.

The smaller the depth of the recess 19 is, the more the conventional dielectric layer 17
However, it is confirmed by the following comparison of two PDPs that the discharge is performed at a pulse voltage lower than that of the conventional PDP. The two PDPs are provided with the concave portion 19 only on one side, and the other structures are the same. The distance between the display electrodes X and Y is about 80 μm, and the thickness of the dielectric layer 17 is 30 μm.
In this case, the relative dielectric constant is 13, and the concave portion 19 has a hole shape as in the third embodiment, and the bottom has a shape defined in FIG.
It is approximately circular with a diameter of about 30 μm and has a depth of 10 μm. In the PDP without the concave portion 19, the discharge started at a pulse voltage of 180V, whereas in the PDP with the concave portion 19, the discharge started at a pulse voltage of 160V. Also, the recess 19 having the groove shape as in the first and second embodiments and having the bottom defined in FIG. 9 started discharging at a lower pulse voltage than that of the related art.

As described above, even if the recess 19 is made shallow, discharge can be performed with a low pulse voltage and the recess 19 can be made shallow, so that the recess 19 can be easily provided.

Further, since the recess 19 becomes shallow, the protective layer 1
8 can be easily formed uniformly and can be driven stably.

Further, for example, in the first embodiment, if the groove is made shallow, it becomes difficult for charges to enter the adjacent discharge cell through the groove. Therefore, the influence of the discharge of one discharge cell on the adjacent discharge cell can be reduced, and stable driving can be realized.

Embodiment 6 FIG. In the sixth embodiment, the dielectric layer 17 is characterized as shown in FIG. The other parts are the same as those in the first to third embodiments, and thus the description is omitted.

In the sixth embodiment, the dielectric layer 17 surrounds the display electrodes X and Y. Also, the bottom of the recess 19 is
And penetrates the gap region Z between the display electrodes X and Y,
Further, there is a discharge space 30 communicating with the recess 19. The display electrodes X and Y are similar to so-called parallel plate electrodes, and the electric field intensity is distributed almost uniformly in the concave portion 19. Moreover,
Since the dielectric layer 17 exists on the front side and the back side of the display electrodes X and Y, the electric field intensity in the concave portion 19 is more uniformly distributed as compared with the fourth embodiment. Therefore, if the structure shown in FIG. 10 is applied, the electric field intensity in the entire concave portion 19 becomes
It gets even stronger.

In the structure shown in FIG. 10, for example, a dielectric layer is formed uniformly on the entire surface of the front substrate 11, then, after the display electrodes X and Y are formed, a dielectric layer is further formed. Finally, the portion which becomes the concave portion 19 is removed by using sandblasting or the like.

The bottom of the concave portion 19 is not limited to the front substrate 11, but may be located between the front substrate 11 and the display electrodes X and Y.

As described above, since the electric field intensity of the entire concave portion 19 is further increased, discharge can be performed with a lower pulse voltage.

Embodiment 7 FIG. In the first to sixth embodiments, since the electric field intensity is strong in the vicinity of the concave portion 19, sputtering is partially caused by strong ion bombardment due to discharge, thereby shortening the life or causing dielectric breakdown.

FIG. 11 schematically shows a part of a cross section of the structure of the PDP according to the seventh embodiment. In FIG. 11, L3, L
2 and L1 are distances from the display electrode X or Y to the dielectric layer 17, respectively, and are closer to the concave portion 19 in this order.

The degree of sputtering is proportional to the number of colliding ions and the energy of the ions. Since the ion energy is higher as the electric field is higher, the ion energy is higher in the concave portion 19. On the other hand, the number of colliding ions is proportional to the magnitude of the current flowing on the surface of the dielectric layer 17 near the collision of the ions.

The shape of the dielectric layer 17 limits the magnitude of the current flowing on the surface of the dielectric layer 17 as follows. The magnitude of the current flowing on the surface of the dielectric layer 17 depends on the magnitude of the capacitance in each part of the structure including the display electrodes X and Y and the dielectric layer 17. The magnitude of the capacitance is inversely proportional to the distance from the display electrodes X and Y to the dielectric layer 17. L
2. If L3> L1, the capacitance of the portion related to L3 is smaller than L1, and the current flowing on the surface of the dielectric layer 17 is also smaller. Therefore, the number of colliding ions near the concave portion 19 is reduced, the degree of sputtering is reduced, and the shortening of the life of the dielectric layer 17 near the concave portion 19 can be suppressed.

Since the withstand voltage of the dielectric breakdown is proportional to the thickness of the dielectric layer 17, if L2, L3> L1, the dielectric breakdown of the dielectric layer 17 near the concave portion 19 can be suppressed.

The relative dielectric constant of the dielectric layer 17 is usually 1
It is very large at about 0 to 15 as compared with the relative dielectric constant (about 1) of the discharge gas. Therefore, even if the distance L3 from the display electrodes X and Y on the front substrate 11 to the dielectric layer 17 is increased, a sufficient potential difference is generated in the concave portion 19.

As described above, the distance from the display electrodes X and Y to the surface of the dielectric layer 17 increases as the distance from the recess 19 increases, so that the life and dielectric breakdown of the dielectric layer 17 near the recess 19 can be suppressed. Can be.

Modification Example The PDP in the embodiment
Has been described with reference to FIG. 12, but is not limited to the structure shown in FIG. 12, but is opposed to each other to form first and second substrates (FIG. 12) which form a discharge space composed of a plurality of discharge cells. In this case, the front substrate 11 and the rear substrate 21) and the second substrate
On the substrate side, first and second electrodes (display electrodes X and Y in FIG. 12) formed parallel to each other with a gap region therebetween.
Any structure may be used as long as it has a structure including a dielectric (dielectric layer 17 in FIG. 12) covering at least the second substrate side of the first and second electrodes.

[0067]

According to the first aspect of the present invention, since the discharge space projects into the concave portion, it is possible to discharge at a low voltage.

According to the second aspect of the present invention, since the recess is a single groove extending over a plurality of discharge cells, it is easy to form the dielectric layer having the recess.

According to the third aspect of the present invention, since the first and second electrodes have the protrusions extending to the concave portions, the electric field strength of the concave portions in the discharge cell is smaller than the electric field strength of the concave portions in the partition walls. Strong in comparison. Therefore, the discharge does not occur in the concave portion of the partition wall, and the charge generated by the discharge is prevented from entering the adjacent discharge cell through the groove. Therefore, the influence of the discharge of one discharge cell on the adjacent discharge cell can be reduced, and stable driving can be realized.

According to the fourth aspect of the present invention, since the recess is isolated between the discharge cells by the partition, the recess does not become a gap between the partition and the dielectric layer. Therefore, the discharge of a certain discharge cell does not affect other discharge cells via the concave portion, and stable driving can be realized.

According to the fifth aspect of the present invention, the concave portion can be formed while forming the dielectric layer by using the screen printing method.

According to the sixth aspect of the present invention, a discharge space exists through the gap region, and the electric field intensity is substantially uniformly distributed in the concave portion. Therefore, the electric field intensity in the entire concave portion is further increased, so that the electric discharge can be performed at a lower voltage.

According to the seventh aspect of the present invention, it is easy to form a concave portion, and when a protective film is added to the dielectric layer, for example,
The protective layer can be easily formed uniformly, and can be driven stably. Furthermore, in the case of the second aspect, it becomes difficult for the charges by the discharge to enter the adjacent discharge cell through the groove. Therefore, the influence of the discharge of one discharge cell on the adjacent discharge cell can be reduced, and stable driving can be realized.

According to the eighth aspect of the present invention, the discharge space penetrates the gap region, and the dielectric exists on the front side and the back side of the first and second electrodes. ,
Evenly distributed. Therefore, the electric field intensity in the entire concave portion is further increased, so that the electric discharge can be performed at a lower voltage.

According to the ninth aspect of the present invention, since the distance from the first and second electrodes to the surface of the dielectric layer is longer as it is closer to the concave portion, the life and dielectric breakdown of the dielectric layer near the concave portion can be suppressed. .

[Brief description of the drawings]

FIG. 1 is a partial plan view and a partial cross-sectional view of a PDP according to Embodiment 1 of the present invention.

FIG. 2 is a partial plan view and a partial cross-sectional view of a PDP according to a second embodiment of the present invention.

FIG. 3 is a partial sectional view of a PDP according to a second embodiment of the present invention.

FIG. 4 is a partial plan view and a partial cross-sectional view of a PDP according to a second embodiment of the present invention.

FIG. 5 is a partial sectional view of a PDP according to a second embodiment of the present invention.

FIG. 6 is a partial plan view of a PDP according to a second embodiment of the present invention.

FIG. 7 is a partial plan view and a partial cross-sectional view of a PDP according to Embodiment 3 of the present invention.

FIG. 8 is a partial sectional view of a PDP according to a fourth embodiment of the present invention.

FIG. 9 is a partial sectional view of a PDP according to a fifth embodiment of the present invention.

FIG. 10 is a partial sectional view of a PDP according to a sixth embodiment of the present invention.

FIG. 11 is a partial sectional view of a PDP according to a seventh embodiment of the present invention.

FIG. 12 is a perspective view of a conventional PDP.

FIG. 13 is a partial plan view and a partial cross-sectional view of a conventional PDP.

[Explanation of symbols]

X, Y display electrodes, 11 front substrate, 17 dielectric layer,
19 recess, 21 rear substrate, 29 partition, 30 discharge space.

Claims (9)

[Claims] 1. A first and a second substrate facing each other and forming a discharge space composed of a plurality of discharge cells, and parallel to each other across a gap region on the second substrate side of the first substrate. The first and second electrodes formed, and a dielectric covering at least the second substrate side of the first and second electrodes, wherein the dielectric is provided at least in the gap region in the discharge cell. A plasma display panel having a concave portion. 2. The plasma display panel according to claim 1, wherein the dielectric is provided over the plurality of discharge cells, and the recess is a single groove extending over the plurality of discharge cells. 3. The display device further comprises a partition provided on the first substrate side of the second substrate and dividing the plurality of discharge cells, wherein the first and second electrodes are more than the plurality of discharge cells in the partition. 3. The plasma display panel according to claim 2, wherein each of the discharge cells has a protrusion extending to the recess. 4. The apparatus according to claim 1, further comprising: a partition provided on the first substrate side of the second substrate to partition the plurality of discharge cells, wherein the recess is separated for each of the discharge cells by the partition. The plasma display panel as described in the above. 5. The plasma display panel according to claim 1, wherein a bottom of said concave portion is said first substrate. 6. The plasma display panel according to claim 1, wherein a bottom of said concave portion is inside said first substrate. 7. The plasma display panel according to claim 1, wherein a bottom of said concave portion is inside said dielectric. 8. The dielectric also covers the first substrate side of the first and second electrodes, and a bottom of the concave portion is provided between the first substrate and the first and second electrodes. The plasma display panel according to any one of claims 1 to 4, wherein: 9. The distance from the first and second electrodes to the surface of the dielectric material is longer as the distance from the concave portion is shorter.
9. The plasma display panel according to any one of 8.