Patent Publication Number: US-2010118005-A1

Title: Plasma display panel and plasma display device

Description:
TECHNICAL FIELD 
     The present invention relates to a plasma display panel and a plasma display device. 
     BACKGROUND ART 
     A plasma display panel (PDP) has two glass plates adhered to each other and displays an image by emitting discharge light in a space formed between the glass plates. Cells corresponding to pixels in an image are self-luminescence ones, which are coated with phosphors which emit visible lights of red, green, and blue under ultraviolet rays generated by discharge. 
     For example, a PDP having a 3-electrode structure displays an image by generating sustain discharge between an X-electrode and a Y-electrode. A cell (cell to be lit) to generate the sustain discharge is selected, for example, by selectively generating address discharge between the Y-electrode and an address electrode. 
     In a general PDP, the X-electrode and the Y-electrode are disposed on a front glass plate, and address electrodes are disposed on a back glass plate. Furthermore, in recent years, a PDP in which three kinds of electrodes of the X-electrode, the Y-electrode, and the address electrodes are disposed on a front glass plate has been proposed (see Patent Document 1, for example). In this PDP, first-layer electrodes such as the X-electrode and the Y-electrode are formed on a glass base, and second-layer electrodes such as address electrodes which are orthogonal to an extension direction of the first-layer electrodes are formed on a dielectric layer covering the first-layer electrodes. The front glass plate includes the glass base and the dielectric layer formed on the glass base. 
     Patent Document 1: Japanese Unexamined Patent Application Publication No. 2005-116508 
     DISCLOSURE OF THE INVENTION 
     Problems to be Solved by the Invention 
     In the PDP of Patent Document 1, the edge part of the dielectric layer is positioned more inside than the edge part of the glass base and is formed to be inclined. An incline is formed on the edge part of the dielectric layer, so that the connection parts of the second-layer electrodes (address electrodes) are formed on a surface of the glass base. In general, when the dielectric layer is formed by a vapor deposition method or the like, it is difficult to accurately form an incline of the dielectric layer and the manufacturing cost increases. Furthermore, metal microspheres deposit on surfaces of the dielectric layer and the like by a sputtering method or a vapor deposition method, so that the thickness of a metal film formed with metal microspheres is likely to vary on the incline (especially folded portion) of the dielectric layer. For this reason, wirings (metal films) of electrodes may be broken in portions where the metal film is thin. In addition, when an electrode pattern is formed using an exposure process after metal microspheres have deposited on surfaces of the dielectric layer and the like by a sputtering method or a vapor deposition method, it is difficult to obtain accurate focus of exposure on the incline of the dielectric layer and the manufacturing cost increases. 
     A proposition of the present invention is to easily form connection parts coupled with a circuit driving a PDP in which electrodes orthogonal to each other are formed on a front glass plate. 
     Means for Solving the Problems 
     A plasma display panel has a first and a second plate facing each other. A plurality of first electrodes extending in a first direction and disposed at intervals and a first dielectric layer covering the first electrodes are provided on the first plate. Further, a plurality of second electrodes extending in a second direction orthogonal to the first direction and disposed at intervals are provided on the first dielectric layer. Each of the second electrodes has a connection part to couple with a circuit applying a voltage to the second electrodes at least at one end part of each of the second electrodes, the connection part being provided on the dielectric layer. For example, an edge part on a side of the connection part of the second plate is positioned more inside than the connection part. 
     EFFECT OF THE INVENTION 
     According to the present invention, connection parts coupled with a circuit driving a PDP in which electrodes orthogonal to each other are formed on a front glass plate can be easily formed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an exploded perspective view showing an embodiment of the present invention. 
         FIG. 2  is an exploded perspective view showing the principal part of the PDP shown in  FIG. 1 . 
         FIG. 3  is a block diagram showing the outline of a circuit unit shown in  FIG. 1 . 
         FIG. 4  is an explanatory diagram showing the outline of the PDP shown in  FIG. 1 . 
         FIG. 5  is an explanatory diagram showing an example of a state of connection between an address driver and the PDP shown in  FIG. 3 . 
         FIG. 6  is an explanatory diagram showing an example of a state of connection between an X driver and the PDP shown in  FIG. 3 . 
         FIG. 7  is an explanatory diagram showing an example of a state of connection between a Y driver and the PDP shown in  FIG. 3 . 
         FIG. 8  is an explanatory diagram showing the outline of a back plate part shown in  FIG. 1 . 
         FIG. 9  is a waveform chart showing an example of discharge operation of a subfield for displaying an image on the PDP shown in  FIG. 1 . 
         FIG. 10  is an explanatory diagram showing the outline of a back plate part of a PDP according to a variation of the present invention. 
         FIG. 11  is an explanatory diagram showing an electrode configuration of a PDP according to another variation of the present invention. 
     
    
    
     BEST MODE FOR CARRYING OUT THE INVENTION 
     Embodiments of the present invention will be described below using the drawings. 
       FIG. 1  shows an embodiment of the present invention. A plasma display device (also referred to as a PDP device hereinafter) has a plasma display panel  10  (also referred to as a PDP hereinafter) of a quadrangular plate shape, an optical filter  20  provided on the image display surface  16  side (light output side) of the PDP  10 , a front case  30  disposed on the image display surface  16  side of the PDP  10 , a rear case  40  and a base chassis  50  which are disposed on a rear surface  18  side of the PDP  10 , a circuit unit  60  attached on the rear case  40  side of the base chassis  50  for driving the PDP  10 , and a double-faced adhesive sheet  70  for adhering the PDP  10  to the base chassis  50 . The circuit unit  60  is made up of two or more parts and is therefore shown with a broken line box in the figure. 
     The PDP  10  has a front plate part  12  constituting an image display surface  16  and a back plate part  14  facing the front plate part  12 . Discharge spaces (cells) not shown in the figure are formed between the front plate part  12  and the back plate part  14 . The front plate part  12  and the back plate part  14  are made of, for example, glass plates. An optical filter  20  is adhered to a protection glass (not shown) which is attached to an opening part  32  of the front case  30 . The optical filter  20  may have an electromagnetic wave shielding function. Furthermore, the optical filter  20  may be directly adhered not to the protection glass but to the image display surface  16  side of the PDP  10 . 
       FIG. 2  shows the principal part of the PDP  10  shown in  FIG. 1 .  FIG. 2  is an exploded perspective view showing the principal part of the PDP  10  in an image display area (area surrounded by a thick broken line in  FIG. 4  described later). An arrow D 1  in the figure indicates a first direction D 1 , and an arrow D 2  indicates a second direction D 2  which is orthogonal to the first direction D 1  in a plane parallel to the image display surface. 
     The front plate part  12  has X bus electrodes Xb and Y bus electrodes Yb which are formed in parallel along the first direction D 1  and formed alternately along the second direction D 2  on a glass base FS (first plate) (on the underside of it in the figure) in order to generate discharge (sustain discharge) repeatedly. An X transparent electrode Xt extending in the second direction D 2  from the X bus electrode Xb toward the Y bus electrode Yb is coupled with the X bus electrode Xb. Furthermore, a Y transparent electrode Yt extending in the second direction D 2  from the Y bus electrode Yb toward the X bus electrode Xb is coupled with the Y bus electrode Yb. In other words, the X transparent electrode Xt and the Y transparent electrode Yt face each other along the second direction D 2 . 
     The X bus electrodes Xb and the Y bus electrodes Yb are opaque electrodes made of metal material or the like, and the X transparent electrodes Xt and the Y transparent electrodes Yt are transparent electrodes which are made of ITO film or the like and transmit light. The transparent electrodes Xt and Yt may be disposed in the whole area between the glass base FS and the bus electrodes Xb and Yb which are in contact with the transparent electrodes Xt and Yt respectively. Furthermore, the transparent electrodes Xt and Yt may be made of the same material (metal material or the like) as that of the bus electrodes Xb and Yb integrally with the bus electrodes Xb and Yb. An X electrode XE (sustain electrode, one kind of first electrodes) includes the X bus electrode Xb and the X transparent electrode Xt, and a Y electrode YE (scan electrode, one kind of first electrodes) include the Y bus electrode Yb and the Y transparent electrode Yt. 
     The electrodes Xb, Xt, Yb, and Yt are covered with a dielectric layer DL 1 . For example, the dielectric layer DL 1  is a silicon dioxide film (film of SiO 2 , film of silicon dioxide) formed by a CVD method. A plurality of address electrodes AE (second electrodes) extending in a direction (second direction D 2 ) orthogonal to the bus electrodes Xb and Yb are provided on the dielectric layer DL 1  (on the underside of it in the figure). The address electrodes AE are covered with a dielectric layer DL 2 , and a surface of the dielectric layer DL 2  is covered with a protective layer PL of MgO or the like. 
     A back plate part  14  facing the front plate part  12  through discharge spaces DS has barrier ribs BR formed in parallel with each other on a glass base RS (second plate). The barrier ribs BR extend in a direction (second direction D 2 ) orthogonal to the bus electrodes Xb and Yb and face the address electrodes AE. In other words, the address electrodes AE are disposed in positions facing the barrier ribs BR. The barrier ribs BR make up the side walls of cells. In addition, phosphors PHr, PHg, and PHb, which emit visible lights of red (R), green (G), and blue (B), respectively, when excited by ultraviolet rays, are coated on the sides of the barrier ribs BR and on the glass base RS between the barrier ribs BR adjacent to each other. 
     One pixel of the PDP  10  is made up of three cells emitting red, green, and blue light. One cell (a pixel of one color) is formed in an area defined by bus electrodes Xb and Yb and barrier ribs BR. Like this, the PDP  10  has cells disposed in a matrix to display an image and two or more kinds of cells emitting light of colors different from each other arranged alternately. Cells formed along the bus electrodes Xb and Yb make up display lines, which is not particularly shown in the figure. 
     The PDP  10  is made up by adhering the front plate part  12  and the back plate part  14  to each other so that the protective layer PL and the barrier ribs BR come into contact with each other and encapsulating the discharge spaces DS with discharge gas such as Ne or Xe. 
       FIG. 3  shows the outline of a circuit unit  60  shown in  FIG. 1 . The circuit unit  60  has an X driver XDRV applying a common pulse to the bus electrodes Xb, a Y driver YDRV selectively applying a pulse to the bus electrodes Yb, an address driver ADRV selectively applying a pulse to the address electrodes AE, a control unit CNT controlling the operations of the drivers XDRV, YDRV, and ADRV, and a power-supply unit PWR. 
     The drivers XDRV, YDRV, and ADRV have lead parts XLD coupled to the bus electrodes Xb (sustain electrodes), lead parts YLD coupled to the bus electrodes Yb (scan electrodes), and lead parts ALD coupled to the address electrodes AE, respectively. The drivers XDRV, YDRV, and ADRV operate as a driver unit driving the PDP  10 . The power-supply unit PWR generates power supply voltages Vsc, Vs/ 2 , −Vs/ 2 , Vsa, etc. supplied to the drivers YDRV, XDRV, and ADRV. 
     The control unit CNT selects a subfield used based on image data R 0 - 7 , G 0 - 7 , and B 0 - 7 , and outputs control signals YCNT, XCNT, and ACNT to the drivers YDRV, XDRV, and ADRV. Subfields are obtained by dividing one field for displaying one screen of the PDP  10 , and the number of times of sustain discharge has been set for each subfield. Then, a multiple gradation image is displayed by selecting the subfield used for each of cells C 1  constituting pixels. 
       FIG. 4  shows the outline of the PDP  10  shown in  FIG. 1 .  FIG. 4  shows the outline of the PDP  10  in a state viewed from the image display surface side (topside in  FIG. 2 ). Shaded portions in the figure show the outer surround part (also referred to as seal area SL hereinafter) of the glass base RS and the barrier ribs BR. End parts of the bus electrodes Xb and Yb are positioned on the edge part of the glass base FS in the front plate part  12  and function as connection parts XCT 1  and YCT 1  to couple with circuits applying voltages to the electrodes XE and YE, respectively. The circuits applying voltages to the electrodes XE and YE are, for example, the drivers XDRV, YDRV, and ADRV shown in  FIG. 3  described above. 
     Furthermore, end parts of the address electrodes AE are positioned between the edge part of the dielectric layer DL 1  and the edge part of the glass base RS (dielectric layer DL 2  in more detail) and function as connection parts MCT and SCT to couple with a circuit (driver ADRV) applying a voltage to the address electrodes AE. For example, the connection parts SCT are spare connection parts coupled to the driver ADRV when any defect has occurred to connection between the driver ADRV and the connection parts MCT (main connection parts). Only the connection parts MCT are provided at the end parts of the address electrodes AE, and the connection parts SCT need not be provided. The edge part of the glass base RS in the back plate part  14  is positioned more inside than the edge part of the dielectric layer DL 2 . 
     The address electrodes AE are provided in positions overlapping the barrier ribs BR, and the transparent electrodes Xt and Yt disposed along the first direction D 1  are alternately arranged. Thus, in cells C 1  adjacent to each other in the first direction D 1  with an address electrode AE in between, the transparent electrodes Yt of both of the cells C 1  are not adjacent to both sides of one address electrode AE. 
     For this reason, when address discharge is generated between the address electrode AE and the transparent electrode Yt of the cell C 1  to which attention is paid (in an address period), erroneous discharge can be prevented from occurring in the adjacent cell C 1 . When address discharge is generated in the discharge space DS of the cell C 1  to which attention is paid, the barrier rib BR also acts as part of the dielectric layer, and an electric field between the address electrode AE and the transparent electrode Yt is generated in the discharge space DS (a concave portion of the back plate part  14  shown in  FIG. 7  described later). 
     A groove GR is formed on the outer surround part (seal area SL) outside the display area (area surrounded by a thick broken line in the figure) of the glass base RS, and seal material SM such as low-melting glass is disposed in the groove GR. The front plate part  12  is adhered to the back plate part  14  with the seal material SM disposed in the groove GR so that the protective layer PL comes into contact with the barrier ribs BR and the seal area SL. For example, the area of the adhered surface between the seal material SM and the front plate part  12  (protective layer PL in more detail) is made smaller than the area of the opening part of the groove GR. 
     An exhaust hole EH extending to the outer surface of the glass base RS is provided in an exhaust space ES formed between the seal area SL and the barrier ribs BR. Because of this, the discharge spaces DS of the assembled PDP  10  can be set to a vacuum state, and discharge gas can be encapsulated in the discharge spaces DS. 
       FIGS. 5 ,  6 , and  7  show an example of the state of connection between the circuit unit  60  and the PDP  10 .  FIGS. 5 ,  6 , and  7  show a cross-sectional view of the PDP  10  and a block diagram of the circuit unit  60 . 
       FIG. 5  shows a cross-sectional view of the PDP  10  taken along the center line (the line A-A′ shown in  FIG. 4  described above) of an address electrode AE. The address electrode AE is formed extending in the second direction D 2  on the dielectric layer DL 1  (on the underside of it in the figure) covering the sustain electrodes XE and the scan electrodes YE. As described above, the address electrode AE has a connection part MCT provided on the dielectric layer DL 1  at one end part of it (right side in the figure) and has a connection part SCT provided on the dielectric layer DL 1  at the other end of it (left side in the figure). The edge part on the connection parts MCT and SCT side of the glass base RS is positioned more inside than the connection parts MCT and SCT in order to expose the connection parts MCT and SCT to the outside of the PDP  10 . 
     In general, the address electrodes AE are formed into an electrode pattern using an exposure process after metal microspheres deposited on a surface of the dielectric layer DL 1  by a sputtering method or a vapor deposition method. In the present invention, the connection parts MCT and SCT (address electrodes AE) are formed on a plane of the dielectric layer DL 1 . Since no incline needs to be formed on the edge part of the dielectric layer DL 1 , the dielectric layer DL 1  can be easily formed. Furthermore, since the connection parts MCT and SCT are formed on the plane, the connection parts MCT and SCT are formed accurately and easily with a general manufacturing process by the above vapor deposition method or the like. 
     As described above, the driver ADRV has the lead parts ALD. In addition, the lead parts ALD have connection parts ACT (plate connection parts) at their ends. The connection parts ACT are coupled with the connection parts MCT provided on the address electrodes AE of the PDP  10  by solder SD or the like. The circuit unit  60  is provided on a flexible printed-circuit board or the like, and the lead parts ALD, XLD, and YLD are formed using a manufacturing process different from that for the electrodes AE, XE, and YE of the PDP  10 . For example, the address electrodes AE are formed using a process of depositing metal microspheres on a surface of the dielectric layer DL 1 , and the lead parts ALD excluding the connection parts ACT are isolated from the dielectric layer DL 1 . 
     In order to prevent connections between the connection parts ACT and the connection parts MCT and SCT from becoming difficult because the connection parts MCT and SCT are formed on the dielectric layer DL 1 , the edge part on the connection parts MCT and SCT side of the glass base RS is positioned more inside than the connection parts MCT and SCT. In other words, the edge part on the connection parts MCT and SCT side of the glass base RS is positioned more inside than the connection parts MCT and SCT, so that the circuit unit  60  (connection parts ACT in more detail) can be easily coupled to the connection parts MCT and SCT. 
       FIG. 6  shows a cross-sectional view of the PDP  10  taken along the center line (the line B-B′ shown in  FIG. 4  described above) of a bus electrode Xb. The bus electrodes Xb (sustain electrodes XE) are formed extending in the first direction D 1  on the glass base FS (on the underside of it in the figure). As described above, each of the electrodes XE has a connection part XCT 1  at one end part of its bus electrode Xb (right side in the figure). A spare connection part may be provided at the other end part of the bus electrode Xb (left side in the figure). 
     Furthermore, the lead parts XLD of the driver XDRV have connection parts XCT 2  at their ends. The connection parts XCT 2  are coupled with the connection parts XCT 1  provided on the bus electrodes Xb of the PDP  10  by solder SD or the like. In this embodiment, the edge part on the connection parts XCT 1  side of the glass base RS is positioned more inside than the connection parts XCT 1 , so that the connection parts XCT 2  can be easily coupled to the connection parts XCT 1 . 
       FIG. 7  shows a cross-sectional view of the PDP  10  taken along the center line (the line C-C′ shown in  FIG. 4  described above) of a bus electrode Yb. The bus electrodes Yb (scan electrodes YE) are formed extending in the first direction D 1  on the glass base FS (on the underside of it in the figure). As described above, each of the electrodes YE has a connection part YCT 1  at one end part of its bus electrode Yb (left side in the figure). A spare connection part may be provided at the other end part of the bus electrode Yb (right side in the figure). 
     Furthermore, the lead parts YLD of the driver YDRV have connection parts YCT 2  at their ends. The connection parts YCT 2  are coupled with the connection parts YCT 1  provided on the bus electrodes Yb of the PDP  10  by solder SD or the like. In this embodiment, the edge part on the connection parts YCT 1  side of the glass base RS is positioned more inside than the connection parts YCT 1 , so that the connection parts YCT 2  can be easily coupled to the connection parts YCT 1 . 
       FIG. 8  shows the outline of the back plate part  14  shown in  FIG. 1 . In this embodiment, the top surface SL 1  of the seal area SL (end surface SL 1  facing the front plate part  12 ) and the top surface BR 1  of the barrier ribs BR (end surface BR 1  facing the front plate part  12 ) are both formed to about the same height. The discharge spaces DS, the groove GR and the exhaust space ES are formed by directly engraving the glass base RS by a sandblast method or the like. In other words, the barrier ribs BR and the groove GR are formed by cutting the glass base RS. Because of this, for example, a baking process for forming the barrier ribs BR is not needed, so that the manufacturing cost of the PDP can be reduced. In many cases, a baking furnace in the baking process uses electricity as energy, and eliminating the baking process also results in a reduction in electric energy. The discharge spaces DS may be formed through the processes of coating of paste-state barrier rib material, drying, sandblasting, and baking. Furthermore, the barrier ribs BR may be formed with lamination by printing. 
       FIG. 9  shows an example of discharge operation in a subfield for displaying an image on the PDP  10  shown in  FIG. 1 . Stars in the figure indicate generation of discharge. Each subfield SF includes a reset period RST, an address period ADR, a sustain period SUS, and an erase period ERS. The erase period ERS is a period for generating discharge for reducing wall charges in only lit cells and therefore may be defined being included in the sustain period SUS. 
     First, in the reset period RST, a negative voltage decreasing gradually (slope pulse) is applied to the sustain electrodes XE (bus electrodes Xb and transparent electrodes Xt), and a positive voltage is applied to the scan electrodes YE (bus electrodes Yb and transparent electrodes Yt) ( FIG. 9  (a)). And, the sustain electrodes XE are sustained to a negative write voltage, and a positive write voltage increasing gradually (write slope pulse) is applied to the scan electrodes YE ( FIG. 9  (b)). Because of this, positive and negative wall charges are stored in the sustain electrodes XE and the scan electrodes YE, respectively, while suppressing luminescence of the cells. Next, a positive adjusting voltage is applied to the sustain electrodes XE, and a negative adjusting voltage (adjusting slope pulse) is applied to the scan electrodes YE ( FIG. 9  (c)). Because of this, the amounts of positive and negative wall charges stored in the sustain electrodes XE and the scan electrodes YE, respectively, decrease, and wall charges in all cells become equal. For example, the positive adjusting voltage is a voltage lower than the voltage Vs/ 2 , and the minimum value of the negative adjusting voltage is a voltage higher than the voltage −Vs/ 2 . 
     In the address period ADR, a scan voltage becoming an anode at address discharge is applied to the sustain electrodes XE, a scan pulse becoming a cathode at address discharge is applied to the scan electrodes YE, and an address pulse (voltage Vsa) becoming an anode at address discharge is applied to address electrodes AE corresponding to lit cells ( FIG. 9  (d)). Cells selected by the scan pulse and the address pulse temporarily discharge. 
     In other words, a voltage larger than the minimum voltage generating discharge (firing voltage) is applied between the scan electrodes YE and the address electrodes AE, and a voltage smaller than the firing voltage is applied between the sustain electrodes XE and the address electrodes AE. Because of this, when address discharge is generated between the address electrode AE and the scan electrode YE of the cell to which attention is paid, erroneous discharge can be prevented from occurring between the sustain electrode XE of the adjacent cell and the address electrode AE. The second address pulse shown in the address electrode AE waveform is applied to select discharge cells of another display line ( FIG. 9  (e)). 
     In the sustain period SUS, negative and positive sustain pulses are applied to the sustain electrodes XE and the scan electrodes YE, respectively ( FIG. 9  (f, g)). Because of this, the discharge states of lit cells are sustained. Sustain pulses which are different in polarity from each other are repeatedly applied to the sustain electrodes XE and the scan electrodes YE, so that discharge of cells lit in the sustain period SUS (sustain discharge) is made repeatedly. 
     In the erase period ERS, a negative pre-erase pulse and a positive high-voltage pre-erase pulse are applied to the sustain electrodes XE and the scan electrodes YE, respectively, and discharge occurs ( FIG. 9  (h)). Because of this, wall charges are stored in the sustain electrodes XE and the scan electrodes YE. At that time, a voltage higher than the voltage Vs/ 2  is applied to the scan electrodes YE, so that the amount of wall charges stored in the scan electrodes relatively increases. Next, a positive erase pulse and a negative erase pulse are applied to the sustain electrodes XE and the scan electrodes YE, respectively ( FIG. 9  (i)). Because of this, discharge occurs, but the difference of voltage values applied between two electrodes is less than the difference of voltage values in the sustain period, so that the amount of wall charges becomes less than that in the sustain period SUS. 
     As described above, in this embodiment, the connection parts MCT and SCT are formed on a plane of the dielectric layer DL 1 , so that the address electrodes AE having the connection parts MCT and SCT can be easily formed. In addition, the end part of the dielectric layer DL 1  need not be made an incline, so that the dielectric layer DL 1  can be easily formed. Furthermore, the edge part on the connection parts MCT and SCT side of the glass base RS is positioned more inside than the connection parts MCT and SCT, so that the circuit unit  60  can be easily coupled to the connection parts MCT and SCT. As a result of this, connection parts coupled with a circuit driving the PDP can be easily formed. 
     In the above embodiment, an example that one pixel is made up of three cells (red (R), green (G), blue (B)) is described. The present invention is not limited to such an embodiment. For example, one pixel may be made up of four cells or more. Alternatively, one pixel may be made up of cells emitting colors other than red (R), green (G), and blue (B), or one pixel may include cells emitting colors other than red (R), green (G), and blue (B). 
     In the above embodiment, an example that the end parts of the address electrodes AE are positioned between the edge part of the dielectric layer DL 1  and the edge part of the glass base RS is described. The present invention is not limited to such an embodiment. For example, the position of the edge part of the dielectric layer DL 1  along the first direction D 1  and the positions of the end parts of the address electrodes AE may be set to the same with each other. In addition, the position of the edge part of the glass base FS along the first direction D 1 , the position of the edge part of the dielectric layer DL 1  along the first direction D 1 , and the positions of the end parts of the address electrodes AE may be set to the same with each other. In this case also, the same effect as the above embodiment can be obtained. 
     In the above embodiment, an example that three kinds of electrodes of the sustain electrode XE, the scan electrode YE, and the address electrodes AE are formed in the front plate part  12  is described. The present invention is not limited to such an embodiment. For example, two kinds of electrodes of the X-electrodes (second electrodes) which also serve as the address electrodes and the scan electrodes YE (first electrodes) may be formed in the front plate part  12 . Alternatively, a Z-electrode assisting sustain discharge between the sustain electrode XE and the scan electrode YE may be provided, and four kinds of electrodes of the sustain electrode XE (one kind of first electrodes), the scan electrode YE (one kind of first electrodes), the address electrodes AE (second electrodes), and the Z-electrode (one kind of first electrodes) may be formed in the front plate part  12 . In this case also, the same effect as that of the above embodiment can be obtained. 
     In the above embodiment, an example that the barrier ribs BR are disposed only in positions facing the address electrodes AE is described. The present invention is not limited to such an embodiment. For example, as shown in  FIG. 10 , barrier ribs BR 2  extending in a direction perpendicular to the address electrodes AE may be formed on the glass base RS.  FIG. 10  shows the outline of the back plate part  14  in which the barrier ribs BR 2  are formed. The same symbols are attached to the same elements as those illustrated in  FIG. 8  described above, and detail description thereof is omitted. In the example of  FIG. 10 , the barrier ribs BR 2  are formed lower than the barrier ribs BR. In other words, the top surface BR 3  of the barrier ribs BR 2  is formed in a position lower than the top surface BR 1  of the barrier ribs BR. Because of this, the discharge spaces DS of the assembled PDP  10  can be set to a vacuum state and discharge gas can be encapsulated in the discharge spaces DS, through the exhaust space ES without being interrupted by the barrier ribs BR 2 . 
     For example, the barrier ribs BR and BR 2  are formed by cutting the glass base RS by a sandblast method or the like. The discharge spaces DS may be formed through the processes of coating of paste-state barrier rib material, drying, sandblasting, and baking. Furthermore, the barrier ribs BR and BR 2  may be formed with lamination by printing. In this case also, the same effect as that of the above embodiment can be obtained. 
     In the above embodiment, an example that seal material SM is disposed in the groove GR formed on the outer surround part (seal area SL) of the glass base RS is described. The present invention is not limited to such an embodiment. For example, the seal material SM may be disposed on the seal area SL (outer surround part) without forming the groove GR. In this case, the top surface SL 1  of the seal area SL may be formed to about the same height as the bottom of concave portions (discharge space DS) formed between the barrier ribs BR or may be formed to about the same height as the top surface BR 1  of the barrier ribs BR. In this case, the same effect as that of the above embodiment can be obtained. 
     In the above embodiment, an example that the transparent electrodes Xt and Yt are disposed in positions facing each other along the second direction D 2  is described. The present invention is not limited to such an embodiment. For example, as shown in  FIG. 11 , apical ends SD 1  and SD 2  of transparent electrodes Xt 2  and Yt 2  may be disposed in positions facing each other along the first direction D 1 .  FIG. 11  shows a state of the electrodes Xb, Xt 2 , Yb, Yt 2 , and AE and the barrier ribs BR viewed from the image display surface side. In the example of  FIG. 11 , the transparent electrodes Xt 2  and Yt 2  and the address electrodes AE are different from the above embodiment. Other configurations are the same as the above embodiment. The same symbols are attached to the same elements as those illustrated in the above embodiment ( FIG. 4 ), and detail description about them is omitted. 
     The apical ends SD 1  of the transparent electrodes Xt 2  coupled with the bus electrodes Xb face the apical ends SD 2  of the transparent electrodes Yt 2  coupled with the bus electrodes Yb. Furthermore, the transparent electrodes Xt 2  and Yt 2  are each formed in T-shaped to widen the opposed parts. The shape of the transparent electrodes Xt 2  and Yt 2  may be a rectangle or a trapezoid. Furthermore, projection parts Ap project from the address electrodes AE toward the transparent electrodes Yt 2  of their respective cells and are integrally formed with the address electrodes AE. For this reason, address discharge can be generated in the cell C 1  to which attention is paid by applying a voltage between the address electrode AE and the transparent electrode Yt 2 . In this case also, the same effect as that of the above embodiment can be obtained. 
     Although the present invention has been described in detail, the above embodiment and its variations are only examples of the present invention, and the present invention is not limited to them. It should be understood that various modifications can be made without departing from the scope of the present invention. 
     INDUSTRIAL APPLICABILITY 
     The present invention can be applied to a plasma display panel and a plasma display device.