Patent Publication Number: US-7583025-B2

Title: Plasma display module and method of manufacturing the same

Description:
CLAIM OF PRIORITY 
     This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C. §119 from an application for PLASMA DISPLAY MODULE AND METHOD FOR MANUFACTURING THE SAME earlier filed in the Korean Intellectual Property Office on 27 May 2004 and there duly assigned Ser. No. 10-2004-0037671. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a plasma display module. 
     2. Description of the Related Art 
     A plasma display module is a display device on which a predetermined image is displayed using light emitted from fluorescent materials excited by ultraviolet rays generated by a gas discharge. It is expected to be a next generation display device since a thin and wide displaying surface can be produced. 
       FIG. 1  is a perspective view of a conventional plasma display module. The plasma display module includes a PDP (plasma display panel)  1  that includes a front panel  10  and a rear panel  20 , a chassis base  40  that supports the PDP  1 , and a plurality of circuit substrates  61 ,  62 ,  63 ,  64 ,  65 , and  66  that drive the PDP  1  and are disposed on a rear side of the chassis base  40 . The circuit substrates  61 ,  62 ,  63 ,  64 ,  65 , and  66  are connected to one another through a connection cable  55  and to the PDP  1  through connection cables  51 ,  52 ,  53 , and  54 . 
     The circuit substrate  61  disposed on an upper central part of the chassis base  40  functions to transform a power supplied from the outside to a required form, the circuit substrate  62  disposed on a lower central part of the chassis base  40  functions to transform image signals received from the outside to meet the driving method of the PDP  1 , the circuit substrate  63  disposed on a left side of the chassis base  40  functions to apply a discharge pulse to a Y electrode  13  which will be described later, the circuit substrate  64  disposed on a right side of the chassis base  40  functions to apply a discharge pulse to an X electrode  12  which will also be described later, and the circuit substrates  65  and  66  disposed on uppermost and lowermost sections of the chassis base  40  function to apply a discharge pulse to address electrodes  22  which will be described later. 
     The PDP  1  depicted in  FIG. 1  is a dual address driving PDP in which the address electrodes are divided on uppermost and lowermost sections of the chassis base  40 . Therefore, two circuit substrates for applying an address signal to the address electrodes  22  are required. However, in a PDP in which the address electrodes are not divided, one of the above circuit substrates  65  and  66  is required. 
     A vent hole P is used for removing impure gases and filling a discharge gas after sealing the front panel  10  and the rear panel  20  in a manufacturing process of the PDP  1 , and when the removal of the impure gasses and the filling of the discharge gas is completed, an end of the vent hole is sealed. 
     The PDP  1  includes a display region AD on which images are displayed and disposed on an overlapping region of the front panel  10  and the rear panel  20  and a sealing region AS on which a sealing member, such as frit for bonding the front panel  10  and the rear panel  20 , is coated surrounding the display region AD. 
     The front panel  10  includes a first connection unit AC 1  disposed on a left side of the sealing region AS and connected to the connection cable  53  and a second connection unit AC 2  to which the connection cable  54  is attached and disposed on a right side of the sealing region AS. The rear panel  20  includes a third connection unit AC 3  to which the connection cable  51  is attached and disposed an upper edge of the sealing region AS and a fourth connection unit AC 4  to which the connection cable  52  is attached and disposed on a lower edge of the sealing region AS. 
       FIG. 2  is a cutaway exploded perspective view of a conventional plasma display module in which a structure of the display region AD is shown. The PDP  1  depicted in  FIG. 2  is similar to the PDP disclosed in Japanese Patent Laid-Open Publication No. 1998-172442 for  Plasma Display and Manufacture Thereof  by Iguchi et al. 
     The PDP  1  includes a rear substrate  21 , a plurality of address electrodes  22  disposed parallel to each other on the entire surface of the rear substrate  21 , a rear dielectric layer  23  that covers the address electrodes  22 , a plurality of barrier ribs  24  formed on the rear dielectric layer  23 , a fluorescent layer  25  formed on side surfaces of the barrier ribs  24  and on the entire surface of the rear dielectric layer  23 , a front substrate  11  disposed parallel to the rear substrate  21 , a plurality of sustain discharge electrode pairs  14  disposed on a rear surface of the front substrate  11 , a front dielectric layer  15  that covers the sustain discharge electrode pairs  14 , and an MgO film  16  that covers the front dielectric layer  15 . 
     The sustain discharge electrode pairs  14  includes an X electrode  12  and a Y electrode  13 . The X and Y electrodes  12  and  13  respectively includes transparent electrodes  12   b  and  13   b  and bus electrodes  12   a  and  13   a.  In the above PDP  1 , one sub-pixel is defined by one sustain discharge electrode pair  14  and two adjacent barrier ribs  24 . 
     In the above PDP  1 , a sub-pixel that will emit light is selected by an address discharge between the address electrode  22  and the Y electrode  13 , the selected sub-pixel generates light by a sustain discharge occurred between the X and Y electrodes  12  and  13  of the sub-pixel selected. More specifically, a discharge gas filled in the sub-pixel generates ultraviolet rays by the sustain discharge, and the ultra violet rays excite the fluorescent layer  25  to generate visible light. An image is displayed on the PDP  1  by the light emitted from the fluorescent layer  25 . 
     There are various conditions for increasing the light emitting efficiency of the PDP  110 . One of the conditions is that elements that hinder the emission of visible light emitted from the fluorescent layer  25  must be minimized. 
     However, in the above structure of PDP  1 , the visible light that passes through the front substrate  11  is approximately 60% of the light emitted from the fluorescent layers  25  since a portion of the visible light emitted from the fluorescent layer  25  is absorbed or reflected by the MgO film  16 , the front dielectric layer  15 , the transparent electrodes  12   b  and  13   b,  and the bus electrodes  12   a  and  13   a.    
     Also, the generation of an address discharge requires time and the address voltage is high since the distance (150 μm (microns) in a conventional product) between the address electrode  22  and the Y electrode  13  is distant. 
     To manufacture the conventional PDP  1 , the front panel  10  can be manufactured such that sustain discharge electrode pairs  14  are formed on the front substrate  11  and the sustain discharge electrode pairs  14  are covered by the front dielectric layer  15  and the MgO film  16 , and the rear panel  20  can be manufactured such that address electrodes  22  are formed on the rear substrate  21 , the address electrodes  22  are covered by the rear dielectric layer  23 , and the barrier ribs  24  and the fluorescent layer  25  are formed on the rear dielectric layer  23 . Afterward, the front panel  10  and the rear panel  20  are air tightly sealed. The manufacturing of the PDP  1  is completed by exhausting impure gases from a space formed between the front panel  10  and the rear panel  20  and filling a discharge gas in the space. 
     To manufacture the conventional PDP  1 , a line of equipment for manufacturing the front panel  10 , another line of equipment for manufacturing the rear panel  20 , and still another line for exhausting impure gasses and filling a discharge gas are separately required. 
     Various equipments can lead to product failures while transferring from one process to another or while aligning the front panel  10  and the rear panel  20 , and process time is long and a large area, thereby increasing the manufacturing costs. 
     SUMMARY OF THE INVENTION 
     It is therefore and object of the present invention to provide a plasma display module that can improve the emission efficiency of light. 
     It is another object of the present invention to provide a plasma display module that can quickly generate an address discharge and reduce an address voltage. 
     It is yet another object of the present invention to provide a plasma display module that can reduce failure rate and manufacturing costs. 
     It is another object of the present invention, to prevent where various equipments can lead to product failures while transferring from one process to another or while aligning the front panel and the rear panel. 
     It is still another object of the present invention to provide process time that is shorter and in a smaller area, thereby decreasing the manufacturing costs. 
     According to an aspect of the present invention, there is provided a plasma display module comprising: a substrate formed of a transparent insulator; a chassis base disposed on a rear side of the substrate; a plurality of barrier ribs formed of a dielectric disposed between the substrate and the chassis base and define discharge cells together with the substrate and the chassis base; a plurality of front discharge electrodes formed in the barrier ribs that surround the discharge cell; a plurality of rear discharge electrodes spaced apart from the front discharge electrodes and formed in the barrier ribs to surround the discharge cell; a fluorescent layer disposed in the discharge cell; a discharge gas filled in the discharge cell; and a plurality of circuit substrates that apply electrical signals to the electrodes by disposing on a rear side of the chassis base. 
     The barrier ribs can be formed on a rear surface of the substrate. 
     The chassis base can be formed of an insulator. In this case, a front surface of the chassis base can be covered by an MgO film. 
     The chassis base can be formed of a conductive material and an insulating layer can be formed on a front surface of the chassis base. In this case, the front surface of the insulating layer can be covered by the MgO film. 
     The fluorescent layer can be formed on a rear surface of the substrate that defines the discharge cell and the thickness of the fluorescent layer may be less than 15 μm. 
     The chassis base can be formed of an insulator, the barrier ribs can be formed on a front surface of the chassis base, and the fluorescent layer can be formed on a front surface of the chassis base that defines the discharge cell. In this case, the rear surface of the substrate may be covered by the MgO film and the thickness of the fluorescent layer may be less than 15 μm. 
     The chassis base can be formed of a conductive material, an insulating layer can be formed on a front surface of the chassis base, the barrier ribs can be formed on a front surface of the insulating layer, and the fluorescent layer can be formed on a front surface of the insulating layer in the discharge cell. In this case, the rear surface of the substrate can be covered by the MgO film and the thickness of the fluorescent layer may be less than 15 μm. 
     The front discharge electrodes and the rear discharge electrodes can be extended in a direction, the chassis base can be formed of an insulator, address electrodes extending to cross the front discharge electrodes and the rear discharge electrodes can be formed on a front surface of the chassis base, the address electrodes can be covered by a dielectric layer, the barrier ribs can be formed on a front surface of the dielectric layer, and the fluorescent layer can be formed on a front surface of the dielectric layer in the discharge cell. In this case, the rear surface of the substrate may be covered by an MgO film and the thickness of the fluorescent layer may be less than 15 μm. 
     The front discharge electrodes and the rear discharge electrodes can be extended in a direction, the chassis base can be formed of a conductive material, an insulating layer can be formed on a front surface of the chassis base, address electrodes extending to cross the front discharge electrodes and the rear discharge electrodes can be formed on a front surface of the insulating layer, the address electrodes can be covered by a dielectric layer, the barrier ribs can be formed on a front surface of the dielectric layer, and the fluorescent layer can be formed on a front surface of the dielectric layer in the discharge cell. In this case, the rear surface of the substrate may be covered by an MgO film and the thickness of the fluorescent layer may be less than 15 μm. 
     The front discharge electrodes can be extended in a direction and the rear discharge electrodes can be extended to cross the front discharge electrodes. In this case, the front discharge electrodes and the rear discharge electrodes can both have a trapezoidal shape. 
     The front discharge electrodes and the rear discharge electrodes can be extended in a direction and the plasma display module can further include address electrodes disposed in the barrier ribs to surround the discharge cell and extended to cross the front discharge electrodes and the rear discharge electrodes. In this case, the front discharge electrodes, the rear discharge electrodes, and the address electrodes may all have a trapezoidal shape. 
     The address electrodes can be disposed in front or rear of the front discharge electrodes. 
     The side surface of the barrier ribs may be covered by an MgO film. 
     According to an aspect of the present invention, there is provided a method of manufacturing a plasma display module comprising: preparing a substrate formed of a transparent insulator and a chassis base formed of an insulator; alternately forming barrier rib layers and electrodes on a rear surface of the substrate; forming a fluorescent layer on a rear surface of the substrate that defines discharge cells partitioned by the barrier ribs formed by the barrier rib layers; and filling a discharge gas in a space formed by coupling the substrate and the chassis base after air tightly sealing the space. In this case, the method can further include the forming of an MgO film on a side surface of the barrier ribs and the forming of an MgO film on a front surface of the chassis base. 
     According to an aspect of the present invention, there is provided a method of manufacturing a plasma display module comprising: preparing a substrate formed of a transparent insulator and a chassis base formed of a conductive material; forming an insulating layer on a front surface of the chassis base; alternately forming barrier rib layers and electrodes on a rear surface of the substrate; forming a fluorescent layer on a rear surface of the substrate that defines the discharge cells partitioned by barrier ribs formed by the barrier rib layers; and filling a discharge gas in a space formed by coupling the substrate and the chassis base after sealing the space. In this case, the method can further include the forming of an MgO film on a side surface of the barrier ribs and the forming of an MgO film on a front surface of the insulating layer. 
     According to an aspect of the present invention, there is provided a method of manufacturing a plasma display module comprising: preparing a substrate formed of a transparent insulator and a chassis base formed of an insulator; alternately forming barrier rib layers and electrodes on a front surface of the chassis base; forming a fluorescent layer on a front surface of the chassis base that defines discharge cells partitioned by barrier ribs formed by the barrier rib layers; and filling a discharge gas in a space formed by coupling the substrate and the chassis base after sealing the space. In this case, the method can further include the forming an MgO film on a side surface of the barrier ribs and the forming of an MgO film on a rear surface of the substrate. 
     According to an aspect of the present invention, there is provided a method of manufacturing a plasma display module comprising: preparing a substrate formed of a transparent insulator and a chassis base formed of a conductive material; forming an insulating layer on a front surface of the chassis base; alternately forming barrier rib layers and electrodes on a front surface of the insulating layer; forming a fluorescent layer on a front surface of the insulating layer in the discharge cells partitioned by the barrier ribs formed by the barrier rib layers; and filling a discharge gas in a space formed by coupling the substrate and the chassis base after sealing the space. In this case, the method can further include the forming of an MgO film on a side surface of the barrier ribs and the forming of an MgO film on a rear surface of the substrate. 
     According to an aspect of the present invention, there is provided a method of manufacturing a plasma display module comprising: preparing a substrate formed of a transparent insulator and a chassis base formed of an insulator; forming address electrodes on a front surface of the chassis base; forming a dielectric layer covering the address electrodes; alternately forming barrier rib layers and electrodes on a front surface of the dielectric layer; forming a fluorescent layer on a front surface of the dielectric layer in the discharge cells partitioned by barrier ribs formed by the barrier rib layers; and filling a discharge gas in a space formed by coupling the substrate and the chassis base after sealing the space air tightly. In this case, the method can further include the forming of an MgO film on a side surface of the barrier ribs and the forming of an MgO film on a rear surface of the substrate. 
     According to an aspect of the present invention, there is provided a method of manufacturing a plasma display module comprising: preparing a substrate formed of a transparent insulator and a chassis base formed of a conductive material; forming an insulating layer on a front surface of the chassis base; forming address electrodes on a front surface of the insulating layer; forming a dielectric layer covering the address electrodes; alternately forming barrier rib layers and electrodes on a front surface of the dielectric layer; forming a fluorescent layer on a front surface of the dielectric layer in the discharge cells partitioned by barrier ribs formed by the barrier rib layers; and filling a discharge gas in a space formed by coupling the substrate and the chassis base after sealing the space. In this case, the method can further include the forming of an MgO film on a side surface of the barrier ribs and the forming of an MgO film on a rear surface of the substrate. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       A more complete appreciation of the invention, and many of the attendant advantages thereof, will be readily apparent as the same becomes better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings in which like reference symbols indicate the same or similar components, wherein: 
         FIG. 1  is an exploded perspective view of a conventional plasma display module; 
         FIG. 2  is a cutaway exploded perspective view of the conventional plasma display module of  FIG. 1 ; 
         FIG. 3  is an exploded perspective view of a plasma display module according to a first embodiment of the present invention; 
         FIG. 4  is a perspective view of a display region of the plasma display module of  FIG. 3 ; 
         FIG. 5  is a cutaway perspective view of the structure of the electrodes of  FIG. 4 ; 
         FIGS. 6 and 7  are cross-sectional views taken along line A-A of  FIG. 3 ; 
         FIG. 8  is a cross-sectional view taken along line B-B of  FIG. 3 ; 
         FIGS. 9 through 19  are cross-sectional views taken along line C-C of  FIG. 4  for describing a method of manufacturing a plasma display module according to a first embodiment of the present invention; 
         FIG. 20  is an exploded perspective view of a display region of the plasma display module according to a first modified version of the first embodiment of the present invention; 
         FIG. 21  is an exploded perspective view of a display region of the plasma display module according to a second modified version of the first embodiment of the present invention; 
         FIG. 22  is a cutaway perspective view of the structure of electrodes of  FIG. 21 ; 
         FIG. 23  is an exploded perspective view of a plasma display module according to a second embodiment of the present invention; 
         FIG. 24  is an exploded perspective view of a display region of the plasma display module of  FIG. 23 ; 
         FIGS. 25 and 26  are cross-sectional view taken along line A-A of  FIG. 23 ; 
         FIG. 27  is a cross-sectional view taken along line B-B of  FIG. 23 ; 
         FIG. 28  is an exploded perspective view of a display region of the plasma display module according to a first modified version of the second embodiment of the present invention; 
         FIG. 29  is an exploded perspective view of a display region of the plasma display module according to a second modified version of the second embodiment of the present invention; and 
         FIG. 30  is an exploded perspective view of a display region of the plasma display module according to a third modified version of the second embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The present invention will now be described more fully with reference to the accompanying drawings in which exemplary embodiments of the invention are shown. 
     A plasma display module according to a first embodiment of the present invention will now be described with reference to  FIGS. 3 through 8 . 
     The plasma display module includes a substrate  111 , a chassis base  150 , a plurality of barrier ribs  115 , an MgO film  116 , a plurality of front discharge electrodes  113 , a plurality of rear discharge electrodes  112 , a plurality of address electrodes  122 , a fluorescent layer  125 , a discharge gas, and circuit substrates  61 ,  62 ,  63 ,  64 ,  65 , and  66 . 
     The chassis base  150  is formed of an insulator, such as a plastic, and disposed on a rear side of the substrate  111 . The insulator can be formed of a material having a resistance to transformation by heat generated by a discharge occurring in a discharge cell  126 , which will be described later, and high thermal conductivity. Also, a front surface of the chassis base  150  is preferably flat since it defines discharge cells  126  by coupling with the substrate  111 . 
     The chassis base  150  supports the circuit substrates  61 ,  62 ,  63 ,  64 ,  65 , and  66  disposed on a rear (X direction) of the chassis base  150 . Although it is not depicted in the drawing, the front surface  150   a  of the chassis base  150  can be covered by an MgO film (not shown) since the MgO film emits many secondary electrons which facilitate the plasma discharge. 
     The circuit substrates  61 ,  62 ,  63 ,  64 ,  65 , and  66  apply electrical signals to electrodes  113 ,  112 , and  122  which will be described later. More specifically, the circuit substrate  61  disposed on the central upper side of the chassis base  150  functions to transform a power supplied from the outside to a required form, the circuit substrate  62  disposed on a lower central part of the chassis base  150  functions to transform image signals received from the outside to meet the driving method of the PDP  1 , the circuit substrate  63  disposed on a left side of the chassis base  150  functions to apply a discharge pulse to rear discharge electrodes  112  which will be described later, the circuit substrate  64  disposed on a right side of the chassis base  40  functions to apply a discharge pulse to front discharge electrodes  113  which will also be described later, and the circuit substrates  65  and  66  disposed on uppermost and lowermost section of the chassis base  150  function to apply a discharge pulse to address electrodes  122  which will be described later. The circuit substrates  61 ,  62 ,  63 ,  64 ,  65 , and  66  are exemplary and the function of each of the circuit substrates is not determined according to the location of the circuit substrates  61 ,  62 ,  63 ,  64 ,  65 , and  66 . 
     The circuit substrates  61 ,  62 ,  63 ,  64 ,  65 , and  66  are connected to each other through a connection cable  55 , the circuit substrates  65  and  66  are connected to end parts  122   a  of the address electrodes  122  respectively by the connection cables  51  and  52 , the circuit substrate  63  is connected to end parts  112   a  of the lower discharge electrode by the connection cable  53 , and the circuit substrate  64  is connected to end parts  113   a  of the upper discharge electrode by the connection cable  54 . 
     The plasma display module  1  depicted in  FIG. 3  is a driven by a dual addressing method, in which the address electrodes  122  are divided on uppermost and lowermost sections (−Z direction and Z direction) of the chassis base  150 . Therefore, two circuit substrates  65  and  66  for applying an address signal to the address electrodes  122  are required. However, in a plasma display module in which the address electrodes  122  are not divided, one of the above circuit substrates  65  and  66  is required. 
     The substrate  111  is formed of a transparent insulator such as glass. The substrate  111  includes a display region AD on which an image is displayed, a sealing region AS, on which a sealing member, such as frit that bonds the chassis base  150  and the substrate  111 , is coated and surrounds the display region is coated, a first connection unit AC 1  to which the connection cable  53  is attached and disposed on a left side of the sealing region AS, a second connection unit AC 2  on which the connection cable  54  is attached and disposed on a right side of the sealing region AS, a third connection unit AC 3  to which the connection cable  51  is attached and disposed on upper side of the sealing region AS, and a fourth connection unit AC 4  to which the connection cable  52  is attached and disposed on a lower side of the sealing region AS. 
     A plug P′ depicted in  FIG. 3  is formed for sealing a vent hole formed on the chassis base  150 . In a manufacturing process of the plasma display module, after exhausting impure gases and filling a discharge gas in a space formed between the substrate  111  and the chassis base  150 , the vent hole is sealed by the plug P′. 
     The sustain discharge electrode pairs  14  and the front dielectric layer  15  that covers the sustain discharge electrode pairs  14  which are formed on a rear surface  11   a  of the substrate of the conventional PDP  1  are not formed on a portion of the rear surface  111   a  of the substrate  111  that defines the discharge cells  126 . Therefore, more than 80% (percent) of visible light emitted from the fluorescent layer  125 , which will be described later, passes through the substrate  111 , thereby improving the light emission efficiency of the plasma display module. 
     The barrier ribs  115  are disposed between the substrate  111  and the chassis base  150 , more specifically, on a rear surface  111   a  of the substrate  111 . The barrier ribs  115  define the discharge cells  126  together with the substrate  111  and the chassis base  150 , and are formed of a dielectric. 
     The discharge cells  126  are disposed in a matrix in  FIG. 4 , but the present invention is not limited thereto, and can be disposed in a delta shape. Also, the shape of the cross-section (cross-section of the y-z plane) of the discharge cell  126  is rectangular, but the present invention is not limited thereto, and can be a polygonal shape, such as a triangle or a pentagon, or an oval or circle. 
     The barrier ribs  115  are formed of a dielectric that can prevent cross-talk between the rear discharge electrodes  112 , the front discharge electrodes  113 , and the address electrodes  122  and the damage of the electrodes  112 ,  113 , and  122  by colliding with charged particles. The dielectric can be PbO, B 2 O 3 , or SiO 2 . 
     Referring to  FIG. 4 , at least side surfaces  115 ′ of the barrier ribs  115  can be covered by the MgO film  116 . The MgO film  116  can be formed by deposition, and the MgO film  116  can be formed on a rear surface  115 ″ of the barrier ribs  115  and a rear surface  111   a  of the substrate  111  when depositing the MgO film  116 . However, the MgO film  116  formed on the rear surface  115 ″ of the barrier ribs  115  and the rear surface  111   a  of the substrate  111  do not have an effect on the operation of the plasma display module according to the present invention. The MgO film  116  formed on a rear surface  111   a  of the substrate  111  does not interrupt the passage of visible light since the thickness of the MgO film  116  is less than 1 μm (micron or micrometers) but is advantageous for generating secondary electrons. 
     The front discharge electrodes  113 , the rear discharge electrodes  112 , and the address electrodes  122  that surround the discharge cell  126  are disposed in the barrier ribs  115 . The front discharge electrodes  113  and the rear discharge electrodes  112  are spaced apart from each other interposing a second barrier rib  115   b  which will be described later, and the rear discharge electrodes  112  and the address electrodes  122  are spaced apart from each other interposing a third barrier rib  115   c.    
     In the present embodiment, the front discharge electrodes  113  and the rear discharge electrodes  112  are extended in a direction, and the address electrodes  122  are extending to cross the front discharge electrodes  113  and the rear discharge electrodes  112 . In  FIG. 5 , each of the front discharge electrodes  113 , the rear discharge electrodes  112 , and the address electrodes  122  are formed in a trapezoidal shape, but the present invention is not limited thereto, and this shape is advantageous for generating an address discharge and sustain discharge at all side surfaces of the discharge cell  126 . 
     The front discharge electrodes  113  and the rear discharge electrodes  112  in the present embodiment surround the discharge cell  126  unlike the conventional sustain discharge electrodes  12  and  13 . Therefore, the volume of space in which the sustain discharge occurs is relatively greater than in the prior art since the sustain discharge occurs along the circumference of the discharge cell  126 . Therefore, the plasma display module according to the present embodiment has greater light emission efficiency than that of a conventional plasma display module. 
     The front discharge electrodes  113  and the rear discharge electrodes  112  are sustain discharge electrodes for displaying an image on the plasma display module. The front discharge electrodes  113  and the rear discharge electrodes  112  can be formed of a conductive metal, such as Ag, Al, or Cu, and the address electrodes  122  can also be formed of a conductive metal. 
     Two sustain discharge electrodes (a sustain discharge electrode pair), that is, an X and Y electrodes and one address electrode  122  are disposed in one discharge cell  126  of a plasma display module which is driven by an address discharge and sustain discharge. The address discharge is a discharge that is generated between the Y electrode and the address electrode  122 . When the address electrode  122  is disposed on a rear side of the rear discharge electrode  112  like in the present embodiment, the rear discharge electrode  112  can be the Y electrode and the front discharge electrode  113  can be the X electrode. On the other hand, when the address electrode  122  is disposed on a front side of the front discharge electrode  113 , the front discharge electrode  113  can be the Y electrode and the rear discharge electrode  112  can be the X electrode. In either case, the distance between the address electrode  122  and the Y electrode is less than 100 μm. Therefore, in the plasma display module according to the present embodiment, a time required for generating an address discharge and the address voltage for generating an address discharge can be reduced when compared to a conventional plasma display module. 
     A fluorescent layer  125  is formed in the discharge cell  126 , more specifically, on a rear surface  111   a  of the substrate  111 . The thickness T of the fluorescent layer  125  can be less than 15 μm since, if the fluorescent layer  125  is thick, the passage of visible light emitted from a lower part of the fluorescent layer  125  toward the substrate  111  may be interrupted. The fluorescent layer  125  can be formed by drying and annealing a paste that includes a phosphor after printing or dispensing the paste on a surface of the discharge cell  126 . 
     The paste includes one of a red phosphor, a green phosphor, and a blue phosphor, a solvent, and a binder. The red phosphor can be Y(V,P)O 4 :Eu, the green phosphor can be Zn 2 SiO 4 :Mn, or YBO 3 :Tb, and the blue phosphor can be BAM:Eu. 
     A discharge gas is filled in the discharge cell  126 . The discharge gas can be a gas mixture of Ne—Xe containing Xe 5-15%, and when it is necessary, a portion of Ne can be replaced by He. 
     A sealing region AS and a structure in the vicinity of the sealing region AS will now be described with reference to  FIGS. 6 through 8 . As it is seen from the drawings, the substrate  111  includes a display region AD, a sealing region AS, and a first connection unit AC 1 . 
     The ventilation region AT disposed between the display region AD and the sealing region AS is a region on which routes R for ventilating impure gasses from a space between the substrate  111  and the chassis base  150  and filling the discharge gas in the space after closely contacting the substrate  111  on which barrier rib layers  115   a,    115   b,    115   c,  and  115   d  and the electrodes  112 ,  113 , and  122  are formed to the chassis base  150  using a method which will be described later. The ventilation region AT is connected to the vent hole which is closed with the plug P′ described above. 
     The impure gases of the discharge cell  126  travel to the routes R through gaps (not shown) formed by tolerance between MgO film  116  and a front surface  150   a  of the chassis base  150 , and the impure gases reached the routes are exhausted to the outside through the vent hole. The discharge gas is filled in the space through a reverse order of ventilating the impure gases. The ventilation region AT, on which routes R for passing gases are formed, can facilitate the ventilation of the impure gases and filling the discharge gas, but the routes R are not necessary. 
     A sealing member  130  is coated on the sealing region AS, and frit can be used as the sealing member  130 . Frit is coated on the sealing region AS in a molten state, and the substrate  111  and the chassis base  150  can be sealed by drying and annealing the coating. 
     Each of the end parts  112   a  of the rear discharge electrodes  112  depicted in  FIG. 6  (a cross-section of the first connection unit AC 1 ) are respectively connected to wires formed on the connection cable  53 , each of the end parts  113   a  of the front discharge electrodes  113  depicted in  FIG. 7  (a cross-section of the second connection unit AC 2 ) are respectively connected to wires formed on the connection cable  54 , and each of the end parts  122   a  of the address electrodes  122  depicted in  FIG. 8  (a cross-section of the third connection unit AC 3 ) are respectively connected to wires formed on the connection cable  51 . The connection of the cross-section of the fourth connection unit AC 4  is omitted since it is symmetrical to the cross-section depicted in  FIG. 8 . 
     The operation of a plasma display module having the above structure will now be described. An address discharge occurs by applying an address voltage between the address electrode  122  and the rear discharge electrode  112 , and as a result of the address discharge, a discharge cell  126  in which a sustain discharge occurs is selected. The selection of a discharge cell  126  denotes that wall charges are accumulated on a region of the barrier ribs  115  (the MgO film  116  if the barrier rib  115  is covered by the MgO film  116 ) adjacent to the front discharge electrode  113  and the rear discharge electrode  112 . When the address discharge is completed, positive ions accumulate in a region adjacent to the rear discharge electrode  112  and electrons accumulate in a region adjacent to the front discharge electrode  113 . 
     After the address discharge, when a sustain discharge voltage is applied between the front discharge electrode  113  and the rear discharge electrode  112 , a sustain discharge occurs by colliding the positive ions accumulated in a region adjacent to the rear discharge electrode  112  with the electrons accumulated in a region adjacent to the front discharge electrode  113 . As the sustain discharge continues, a discharge sustain voltage is repeatedly applied inversely to the rear discharge electrode  112  and the front discharge electrode  113 . 
     The energy level of the discharge gas increases by the sustain discharge, and the discharge gas emits ultraviolet rays with an energy level of the discharge gas reducing. The ultraviolet rays increase the energy level of a phosphor included in the fluorescent layer  125  disposed in the discharge cell  126 . Visible light is generated as the energy level of the fluorescent layer  125  reduces. An image is displayed on the plasma display module by the visible light emitted from each of the discharge cells  126 . 
     A method of manufacturing the plasma display module according to the first embodiment will now be described in detail with reference to  FIGS. 9 through 19 . This method includes operations of (a), (b), (c), and (d) which will be described later. 
     The operation (a) is a step for preparing a substrate  111  formed of a transparent insulator and a chassis base  150  formed of an insulator, the operation (b) is a step for alternately forming the barrier rib layers on a rear surface  111   a  of the substrate  111  and the electrodes  112 ,  113 , and  122 , the operation (c) is a step for forming a fluorescent layer  125  on a rear surface  111   a  of the substrate  111  that defines the discharge cells  126  partitioned by the barrier ribs  115  formed by the barrier rib layers, and the operation (d) is a step for filling a discharge gas in a space formed by sealing the substrate  111  and the chassis base  150  after sealing the space. 
     The substrate  111  prepared in the operation (a) can be formed of an insulator having high light transmittance such as glass. The chassis base  150  prepared in the operation (a) can be formed of an insulator such as a plastic. Referring to  FIG. 9 , a substrate  111  is prepared. The prepared chassis base  150  is not shown. The plasma display module according to the present embodiment does not include the rear substrate  21  unlike a conventional plasma display module. Therefore, an equipment line for manufacturing the rear substrate  21  is unnecessary and a space for installing the equipment can be reduced, thereby reducing the manufacturing cost. 
     In preparing the chassis base  150 , the chassis base  150  preferably has an MgO film on a front surface  150   a  of the chassis base  150  since the MgO film generates many secondary electrons that facilitate the plasma discharge. 
     In the operation (b), the barrier rib layers  115   a,    115   b,    115   c,  and  115   d  and the electrodes  113 ,  112 , and  122  are alternately formed on a rear surface  111   a  of the substrate  111 . 
     First, the first barrier rib layer  115   a  is formed on a rear surface  111 . The first barrier rib layer  115   a  is formed to a predetermined pattern by drying a dielectric paste printed on a rear surface  111   a  of the substrate  111 . The method of patterning the first barrier rib layer  115   a  to a predetermined pattern, can be a method of printing a dielectric paste in a predetermined pattern in advance, or a method using sandblasting to remove a portion that is unnecessary after printing a dielectric paste on the entire rear surface  111   a  of the substrate  111 . An annealing process can be performed after drying the first barrier rib layer  115   a,  if necessary. The formed first barrier rib layer  115   a  is depicted in  FIG. 10 . 
     The front discharge electrode  113  is formed after the formation of the first barrier rib layer  115   a  is completed. The front discharge electrode  113  is formed by performing drying, exposing, and developing a layer formed of a paste in which a conductive metal, such as Ag, Cu, or Al is included after printing, such as screen printing, the paste on a rear surface  115   a′  of the first barrier rib layer  115   a.  The formed front discharge electrode  113  is depicted in  FIG. 11 . 
     The second barrier rib layer  115   b  that covers the front discharge electrode  113  is formed after the formation of the front discharge electrode  113  is completed. The second barrier rib layer  115   b  is formed by an identical or a similar method for forming the first barrier rib layer  115   a  and the formed second barrier rib layer  115   b  is depicted in  FIG. 12 . 
     Next, the rear discharge electrode  112  is formed after the formation of the second barrier rib layer  115   b  is completed. The rear discharge electrode  112  is formed by an identical or a similar method for forming the front discharge electrode  113  and the formed rear discharge electrode  112  is depicted in  FIG. 13 . 
     The third barrier rib layer  115   c  that covers the rear discharge electrode  112  is formed after the formation of the rear discharge electrodes  112  is completed. The third barrier rib layer  115   c  is formed by an identical or a similar method for forming the first barrier rib layer  115   a  and the formed third barrier rib layer  115   c  is depicted in  FIG. 14 . 
     The address electrode  22  is formed after the formation of the third barrier rib layer  115   c  is completed. The address electrode  122  is formed by an identical or a similar method for forming the front discharge electrode  113  but the pattern is formed different from the front discharge electrode  113 , and the formed address electrode  122  is depicted in  FIG. 15 . 
     The fourth barrier rib layer  115   d  that covers the address electrode  122  is formed after the formation of the address electrode  122  is completed. The fourth barrier rib layer  115   d  is formed by an identical or a similar method for forming the first barrier rib layer  115   a  and the formed second barrier rib layer  115   b  is depicted in  FIG. 16 . 
     Each of the first barrier rib layer  115   a,  the second barrier rib layer  115   b,  the third barrier rib layer  115   c,  and the fourth barrier rib layer  115   d  can be formed by stacking more than two layers to increase the thickness thereof. Also, the second barrier rib layer  115   b  and the third barrier rib layer  115   c  are requisite for insulating the electrodes but the first barrier rib layer  115   a  and the fourth barrier rib layer  115   d  may not be formed since the first barrier rib layer  115   a  and the fourth barrier rib layer  115   d  are not requisite and are used for securing the discharge space. 
     In the operation (b), the front discharge electrode  113  formed between the first barrier rib layer  115   a  and the second barrier rib layer  115   b  is extended in a direction, the rear discharge electrode  112  formed between the second barrier rib layer  115   b  and the third barrier rib layer  115   c  is extended parallel to the front discharge electrode  113 , and the address electrode  122  formed between the third barrier rib layer  115   c  and the fourth barrier rib layer  115   d  is extended to cross the front discharge electrode  113 . Also, the front discharge electrode  113 , the rear discharge electrode  112 , and the address electrode  122  are formed to surround the discharge cell  126 . 
     In  FIG. 5 , the front discharge electrode  113 , the rear discharge electrode  112 , and the address electrode  122  are formed in a trapezoidal shape, but the present invention is not limited thereto. Also, in the present embodiment, the address electrode  122  is disposed on a rear side of the rear discharge electrode  112 , but the address electrode  122  can be disposed on a front side of the front discharge electrode  113 . 
     The operation of (c) is a step for forming the fluorescent layer  125  on a front side of the discharge cells  126  defined partitioned by the barrier rib layers  115   a,    115   b,    115   c,  and  115   d,  more specifically, on a rear surface  111   a  of the substrate  111 . The fluorescent layer  125  can be formed by drying and annealing a paste that includes a phosphor after printing or dispensing the paste on a rear surface  111   a  of the substrate  111 . The thickness T of the fluorescent layer  125  is preferably less than 15 μm (microns) after annealing. The formed fluorescent layer  125  is depicted in  FIG. 18 . 
     An operation for forming the MgO film  116  on a side surface  115 ′ of the barrier rib  115  can further be included before or after the operation (c). The MgO film  116  can be formed in a thickness of less than 1 μm, such as 0.7 μm. The MgO film  116  prevents the barrier ribs  115  formed of a dielectric from sputtering by positive ions when a plasma discharge occurs and generates many secondary electrons that facilitate the plasma discharge. In the present embodiment, the MgO film  116  is formed before performing the operation (c), and the formed MgO film  116  is depicted in  FIG. 17 . 
     When the MgO film  116  is formed by deposition before performing the operation (c), the MgO film  116  is formed between the fluorescent layer  125  and the substrate  111 . When the MgO film  116  is formed by deposition after performing the operation (c), the MgO film  116  can be formed on the fluorescent layer  125 . In both cases, the MgO film  116  is formed on a rear surface  115 ″ of the barrier rib  115 . The MgO film  116  formed in both cases does not adversely affect the operation of the plasma display module. 
     The MgO film  116  can be deposited in a predetermined pattern before or after the operation (c) by disposing a mask having a predetermined pattern on a rear side of the barrier rib  115 . The mask can have an arbitrary pattern so that the MgO film  116  can be formed only on a side surface  115 ′ of the barrier rib  115 . 
     The operation (d) is performed after the operations (a) through (c) are completed. In the operation (d), the substrate  111  and the chassis base  150  are bonded and a space formed between the substrate  111  and the chassis base  150  is sealed from the outside. The sealing is performed such that a molten state of sealing member  130 , such as frit, is coated on the sealing region AS of the substrate  111  and/or the chassis base  150  and the substrate  111  and the chassis base  150  are bonded prior to hardening the sealing member  130 . Afterward, the sealing is completed by annealing the frit. 
     After the space between the substrate  111  and the chassis base  150  is sealed by the sealing member, impure gases present in the space are exhausted. Then, a discharge gas is filled in the space through a vent hole formed on the chassis base  150 . When the filling of the discharge gas is completed, the vent hole is closed using a plug P′. The sealed and bonded state of the substrate  111  and the chassis base  150  is depicted in  FIG. 19 . 
     The description of manufacturing the circuit substrates  61 ,  62 ,  63 ,  64 ,  65 , and  66 , mounting the circuit substrates  61 ,  62 ,  63 ,  64 ,  65 , and  66  on a rear side of the chassis base  150 , and connecting the end parts  112   a,    113   a,  and  122   a  of the electrodes formed on the substrate  111  using the connection cables  51 ,  52 ,  53 ,  54 , and  55  are omitted since techniques for these are well known in the art. 
     A first modified version of the first embodiment with respect to mainly the differences from the first embodiment will now be described with reference to  FIG. 20 . The different point of the present modified version from the first embodiment is that a chassis base  250  is formed of a conductive material and an insulating layer  251  is formed on a front surface  250   a  of the chassis base  250 . 
     A large amount of heat is generated in the discharge cell when plasma discharges occur. However, if the chassis base  250  is formed of a non-conductive material, such as plastic, as in the first embodiment, the heat generated locally in the display region AD cannot be easily dissipated to other elements. In this case, a latent image may be generated on the portion on which heat is accumulated, thereby degrading the image quality. Also, after long hours of operation of the plasma display module, the image quality of the whole display region AD may be degraded. 
     In the present modified version, the chassis base  250  is formed of a conductive material, such as Al, since the conductive material has a greater thermal conductivity than the insulator. However, an insulating layer  251  can be formed on a front surface  250   a  of the chassis base  250  since serious problems from the plasma discharge could arise if the conductive material is exposed to the discharge cell  126 . 
     Furthermore, the front surface  251   a  of the insulating layer  251  is preferably covered by an MgO film (not shown) since the MgO film emits many secondary electrons which facilitate the plasma discharge. 
     The method of manufacturing the plasma display module according to the present modified version is at least similar to the method of manufacturing the plasma display module described in the first embodiment. However, they are different as follows in the operation (a). 
     That is, in the operation (a), a chassis base  250  formed of a conductive material must be prepared and the insulating layer  251  is formed on a front surface  250   a  of the chassis base  250 . Then, an MgO film (not shown) can be formed on a front surface  251   a  of the insulating layer  251 . 
     Elements that are not described in the first modified version of the first embodiment are identical to the elements of the first embodiment. 
     A second modified version of the first embodiment with respect to mainly the difference from the first embodiment will now be described with reference to  FIGS. 21 and 22 . The difference of the present embodiment from the first embodiment is that there is no address electrode  122  in the present embodiment. 
     Only two discharge electrodes can generate a discharge in a specific discharge cell  126 . Therefore, the address electrodes  122  are not requisite for generating a discharge in the discharge cell  126 . However, if there is no address electrode, the front discharge electrodes  313  and the rear discharge electrodes  312  are extended to cross each other so that a discharge cell  126  in which the discharge occurs can be selected. The structure of the electrodes is shown in  FIG. 22 . 
     In the present embodiment, only three barrier rib layers are required to dispose the electrodes between the barrier rib layers since there is no address electrode, and only one barrier rib layer can be required since the foremost and the rearmost barrier rib layers are unnecessary. In this case, the one barrier rib layer is disposed between the front discharge electrode  313  and the rear discharge electrode  312 . 
     The method of manufacturing the plasma display module according to the present modified version is omitted since the method is similar to the method of manufacturing the plasma display module according to the first embodiment. 
     The second modified version of the first embodiment can be combined with the first modified version of the first embodiment. 
     Elements that are not described in the second modified version of the first embodiment are identical to the elements of the first embodiment. 
     A plasma display module according to the second embodiment will now be described with reference to  FIGS. 23 through 27 . 
     The plasma display module includes a substrate  411 , a chassis base  450 , a plurality of barrier ribs  415 , an MgO film  416 , a plurality of front discharge electrodes  413 , a plurality of rear discharge electrodes  412 , a plurality of address electrodes  422 , a fluorescent layer  425 , a discharge gas, and a plurality of circuit substrates  61 ,  62 ,  63 ,  64 ,  65 , and  66 . 
     The chassis base  450  is formed of an insulator, such as plastic, and is disposed on a rear (−X direction) of the substrate  411 . The insulator can be formed of a material having a resistance to heat generated by a discharge in a discharge cell  426  and high thermal conductivity. Also, a front surface  450   a  of the chassis base  450  is flat since the chassis base  450  defines discharge cells  426  by coupling with the substrate  411 . 
     The chassis base  450  supports the circuit substrates  61 ,  62 ,  63 ,  64 ,  65 , and  66  disposed on a rear (−X direction) of the chassis base  450 . Although it is not depicted in the drawing, but the front surface  450   a  of the chassis base  450  can be covered by an MgO film (not shown) since the MgO film emits many secondary electrons which facilitate the plasma discharge. 
     The circuit substrates  61 ,  62 ,  63 ,  64 ,  65 , and  66  apply electrical signals to electrodes  413 ,  412 , and  422  which will be described later. The circuit substrates  61 ,  62 ,  63 ,  64 ,  65 , and  66  are connected to each other through a connection cable  55 , the circuit substrates  65  and  66  are connected to end parts  422   a  of the address electrodes  422  respectively by the connection cables  51  and  52 , the circuit substrate  63  is connected to end parts  412   a  of the rear discharge electrode  412  by the connection cable  53 , and the circuit substrate  64  is connected to end parts  413   a  of the front discharge electrode  413  by the connection cable  54 . 
     The PDP depicted in  FIG. 23  is driven by a dual addressing method, in which the address electrodes  422  are divided on uppermost and lowermost sections (−Z direction and +Z direction) of the chassis base  450 . Therefore, two circuit substrates  65  and  66  for applying an address signal to the address electrodes  422  are required. However, in a PDP in which the address electrodes are not divided, one of the above circuit substrates  65  and  66  is required. 
     The substrate  411  is formed of a transparent insulator such as glass. The substrate  411  includes a display region AD on which an image is displayed and a sealing region AS, on which a sealing member, such as frit that bonds the chassis base  450  and the substrate  411 , is coated and surrounds the display region AD. 
     Referring to  FIGS. 25 through 27 , the barrier ribs  415  are formed by barrier rib layers  415   a,    415   b,    415   c,  and  415   d,  the electrodes  413 ,  412 , and  422  are interposed between the barrier rib layers, and each of the end parts  413   a,    412   a,  and  422   a  are formed on a front surface  450   a  of the chassis base  450 . Accordingly, as depicted in  FIG. 23 , the connection units AC 1 , AC 2 , AC 3 , and AC 4  are disposed on the chassis base  450  not on the substrate  411  unlike in the first embodiment. A plug P′ depicted in  FIG. 23  is for closing a vent hole formed on the chassis base  450 . 
     The sustain discharge electrode pair  14  disposed on a rear surface  11   a  of the substrate  11  and the front dielectric layer  15  that covers the sustain discharge electrode pair  14  of a conventional the PDPs are not formed on a portion of a rear surface  411   a  of the substrate  411  that defines the discharge cell  426 . Therefore, greater than 80% of the visible light emitted from the fluorescent layer  425 , which will be described later, can pass the substrate  411 , thereby improving the emission efficiency of light of the plasma display module. 
     Although it is not shown in the drawing, the rear surface  411   a  of the substrate  411  can be covered by an MgO film (not shown) since the MgO film emits many secondary electrons that facilitate the plasma discharge. If the thickness of the MgO film is formed to less than 0.7 μm (microns), the MgO film does not interrupt the passage of visible light emitted from the fluorescent layer  425 . 
     In the present embodiment, the barrier ribs  415  and the fluorescent layer  425  are formed on a front surface  450   a  of the chassis base  450  unlike in the first embodiment. The barrier ribs  415  define the discharge cells  426  together with the substrate  411  and the chassis base  450 , and are formed of a dielectric. The arrangement and the shape of the cross-section of the discharge cells  426  are not limited to the arrangement and the shape depicted in  FIG. 24 . 
     The barrier ribs  415  can prevent cross-talk between the rear discharge electrodes  412 , the front discharge electrodes  413 , and the address electrodes  422  and the damage of the electrodes  412 ,  413 , and  422  by colliding with charged particles. The dielectric can be PbO, B 2 O 3 , or SiO 2 . 
     Referring to  FIG. 24 , at least side surfaces  415 ′ of the barrier ribs  415  can be covered by the MgO film  416 . The MgO film  416  can be formed by deposition. Further, the MgO film  416  can be deposited on a front surface  415 ″ of the barrier ribs  415  and a front surface  450   a  of the chassis base  450 . However, the MgO film  416  formed on the front surface  415 ″ of the barrier ribs  415  and the front surface  450   a  of chassis base  450  do not affect the operation of the plasma display module according to the present invention. 
     The front discharge electrodes  413 , the rear discharge electrodes  412 , and the address electrodes  422  that surround the discharge cell  426  are disposed in the barrier ribs  415 . The front discharge electrodes  413  and the rear discharge electrodes  412  are spaced apart from each other interposing a third barrier rib  415   c  which will be described later, and the rear discharge electrodes  412  and the address electrodes  422  are spaced apart from each other interposing a second barrier rib  415   b.    
     In the present embodiment, the front discharge electrodes  413  and the rear discharge electrodes  412  are extended in a direction, and the address electrodes  422  are extending to cross the front discharge electrodes  413  and the rear discharge electrodes  412 . The arrangement of the electrodes  412 ,  413 , and  422  is the same as the structure depicted in  FIG. 5 . In  FIG. 5 , each of the front discharge electrodes  413 , the rear discharge electrodes  412 , and the address electrodes  422  are formed in a trapezoidal shape, but the present invention is not limited thereto, and this shape is advantageous for generating an address discharge and sustain discharge at all side surfaces of the discharge cell  426 . 
     The front discharge electrodes  413  and the rear discharge electrodes  412  in the present embodiment surround the discharge cell  426  unlike the conventional sustain discharge electrodes  12  and  13 . Therefore, the volume of space in which the sustain discharge occurs is relatively greater than in the conventional art since the sustain discharge occurs along the circumference of the discharge cell  426 . Therefore, the plasma display module according to the present embodiment has greater light emission efficiency than that of a conventional plasma display module. 
     The front discharge electrodes  413  and the rear discharge electrodes  412  are electrodes and a sustain discharge for displaying an image on the plasma display module occurs therebetween. The front discharge electrodes  413  and the rear discharge electrodes  412  can be formed of a conductive metal, such as Ag, Al, or Cu, and the address electrodes  422  can also be formed of a conductive metal. 
     Two sustain discharge electrodes (a sustain discharge electrode pair), that is, an X and Y electrodes and one address electrode  422  are disposed in one discharge cell  426  of a plasma display module which is driven by an address discharge and sustain discharge. The address discharge is a discharge generating between the Y electrode and the address electrode  422 . When the address electrode  422  is disposed on a rear side of the rear discharge electrode  412 , as in the present embodiment, the rear discharge electrode  412  can be the Y electrode and the front discharge electrode  413  can be the X electrode. On the other hand, when the address electrode  422  is disposed on a front side of the front discharge electrode  413 , the front discharge electrode  413  can be the Y electrode and the rear discharge electrode  412  can be the X electrode. In either case, the distance between the address electrode  422  and the Y electrode is less than 100 μm. Therefore, in the plasma display module according to the present embodiment, a time required for generating an address discharge and the address voltage for generating address discharge can be reduced when compared to a conventional plasma display module. 
     A fluorescent layer  425  is formed in the discharge cell  426 , more specifically, on a front surface  450   a  of the chassis base  450  that defines the discharge cell  426 . The thickness T of the fluorescent layer  425  can be less than 15 μm since, if the fluorescent layer  425  is thick, the passage of visible light emitted from a lower part of the fluorescent layer  425  toward the substrate  411  may be interrupted. The fluorescent layer  425  can be formed by drying and annealing a paste that includes a phosphor after printing or dispensing the paste on a surface of the discharge cell  426 . 
     The paste includes one of a red phosphor, a green phosphor, and a blue phosphor, a solvent, and a binder. The red phosphor can be Y(V,P)O 4 :Eu, the green phosphor can be Zn 2 SiO 4 :Mn, or YBO 3 :Tb, and the blue phosphor can be BAM:Eu. 
     A discharge gas is filled in the discharge cell  426 . The discharge gas can be a gas mixture of Ne—Xe containing Xe 5-15%, and when it is necessary, a portion of Ne can be replaced by He. 
     A sealing region AS and a structure in the vicinity of the sealing region AS will now be described with reference to  FIGS. 25 through 27 . As it can be seen from the drawings, the substrate  411  is divided into the display region AD and the sealing region. 
     The ventilation region AT disposed between the display region AD and the sealing region AS is a region on which routes R that facilitate the ventilation of impure gasses from a space between the substrate  411  and the chassis base  450  and filling the discharge gas in the space after closely contacting the substrate  411  to the chassis base  450  on which barrier rib layers  415   a,    415   b,    415   c,  and  415   d  and the electrodes  412 ,  413 , and  422  are formed using a method which will be described later. The ventilation region AT is connected to the vent hole which is closed with the plug P′ described above. 
     The impure gases of the discharge cell  426  travel to the routes R through gaps (not shown) formed by tolerance between the MgO film  116  and a rear surface  411   a  of the substrate  411 , and the impure gases reached the routes R are exhausted to the outside through the vent hole. The discharge gas is filled in the space through a reverse order of ventilating the impure gases. The ventilation region AT, on which routes R for passing gases are formed, can facilitate the ventilation of the impure gases and filling the discharge gas, but the routes R are not requisite. 
     A sealing member  430  is coated on the sealing region AS, and frit can be used as the sealing member  430 . Frit is coated on the sealing region AS in a molten state, and the substrate  411  and the chassis base  450  can be sealed by drying and annealing the coating. 
     Each of the end parts  412   a  of the rear discharge electrodes  412  depicted in  FIG. 25  are respectively connected to wires formed on the connection cable  53 , each of the end parts  413   a  of the front discharge electrodes  413  depicted in  FIG. 26  are respectively connected to wires formed on the connection cable  54 , and each of the end parts  422   a  of the address electrodes  422  depicted in  FIG. 27  are respectively connected to wires formed on the connection cable  51 . 
     The plasma display module having the above configuration is operated as the manner described in the first embodiment. 
     A method of manufacturing the plasma display module according to the second embodiment mainly with respect to the difference from the first embodiment will now be described. 
     The method of manufacturing the plasma display module according to the second embodiment also includes operations of (a), (b), (c), and (d) as in the first embodiment. The operations of (a) and (d) of the second embodiment are identical respectively to the operations of (a) and (d) of the first embodiment. However, in the operation (a) of the second embodiment, it is desirable to prepare a substrate  411 , a rear surface  411   a  of which has an MgO film (not shown) since the MgO film emits many secondary electrons that facilitate the plasma discharge. 
     The operation (b) of the second embodiment unlike the operation (b) of the first embodiment is a step for alternately forming the barrier rib layers  415   a,    415   b,    415   c,  and  415   d  and the electrodes  422 ,  412 , and  413  on a front surface  450   a  of the chassis base  450 . The method of forming and materials for forming each of the barrier rib layers  415   a,    415   b,    415   c,  and  415   d  and the electrodes  422 ,  412 , and  413  are identical to the method and the materials of the first embodiment, but the sequence of stacking the barrier rib layers  415   a,    415   b,    415   c,  and  415   d  and the electrodes  422 ,  412 , and  413  are different. That is, in the present embodiment, a first barrier rib layer  415   a  on the chassis base  450 , the address electrode  422  is formed on the first barrier rib layer  415   a,  a second barrier rib layer  415   b  is formed on the address electrode  422 , the rear discharge electrode  412  is formed on the second barrier rib layer  415   b,  a third barrier rib layer  415   c  is formed on the rear discharge electrode  412 , the front discharge electrode  413  is formed on the third barrier rib layer  415   c,  and a fourth barrier rib layer  415   d  is formed on the front discharge electrode  413 . 
     Each of the first barrier rib layer  415   a,  the second barrier rib layer  415   b,  the third barrier rib layer  415   c,  and the fourth barrier rib layer  415   d  can be formed by stacking at least three layers to increase the thickness thereof. Also, the second barrier rib layer  415   b  and the third barrier rib layer  415   c  are requisite for insulating the electrodes but the first barrier rib layer  415   a  and the fourth barrier rib layer  415   d  may not be formed since the first barrier rib layer  415   a  and the fourth barrier rib layer  415   d  are not requisite and are used for securing the discharge space. 
     In the operation (b), the front discharge electrode  413  formed between the first barrier rib layer  415   a  and the second barrier rib layer  415   b  is extended in a direction, the rear discharge electrode  412  formed between the second barrier rib layer  415   b  and the third barrier rib layer  415   c  is extended parallel to the front discharge electrode  413 , and the address electrode  422  formed between the first barrier rib layer  415   a  and the second barrier rib layer  415   b  is extended to cross the front discharge electrode  413 . Also, the front discharge electrode  413 , the rear discharge electrode  412 , and the address electrode  422  are formed to surround the discharge cell  426 . 
     The operation (c) of the second embodiment is a step for forming the fluorescent layer  425  on a front surface  450   a  of the chassis base  450  that defines (or determines the boundaries of) the discharge cells  426  unlike the operation (c) of the first embodiment. The method of forming and the thickness of the fluorescent layer  425  of the preset embodiment are identical to the fluorescent layer  125  of the first embodiment. However, the location is different. 
     An operation for forming the MgO film  416  on a side surface  415 ′ of the barrier rib  415  can further be included before or after the operation (c). The MgO film  416  can be formed in a thickness of less than 1 μm (microns), such as 0.7 μm. The MgO film  416  prevents the barrier ribs  415  formed of a dielectric from sputtering by positive ions when a plasma discharge occurs and generates many secondary electrons that facilitate the plasma discharge. 
     When the MgO film  416  is formed by deposition before performing the operation (c), the MgO film  416  can be formed between the fluorescent layer  425  and chassis base  450 . When the MgO film  416  is formed by entire deposition after performing the operation (c), the MgO film  416  can be formed on the fluorescent layer  125 . In both cases, the MgO film  416  is formed on a front surface  415 ″ of the barrier rib  415 . The MgO film  416  formed in either case does not adversely affect the operation of the plasma display module. 
     The MgO film  416  can be deposited in predetermined pattern before or after the operation (c) by disposing a mask having a predetermined pattern on a front side of the barrier rib  415 . The mask can have an arbitrary pattern so that the MgO film  416  can be formed only on a side surface  415 ′ of the barrier rib  415 . 
     Elements that are not described in the second embodiment are identical to the elements of the first embodiment. 
     A first modified version of the second embodiment with respect to mainly the differences from the first embodiment will now be described with reference to  FIG. 28 . The different point of the present modified version from the second embodiment is that a chassis base  550  is formed of a conductive material and an insulating layer  551  is formed on a front surface  550   a  of the chassis base  550 . 
     A lot of heat is generated in the discharge cell when a plasma discharge occurs. However, if the chassis base  550  is formed of a non-conductive material, such as plastic, as in the second embodiment, the heat generated locally in the display region AD cannot be easily dissipated to other elements. In this case, a latent image may be generated on the portion on which heat is accumulated, thereby degrading the image quality. Also, after hours of operation of the plasma display module, the image quality of the whole display region AD may be degraded. 
     In the present modified version, the chassis base  550  is formed of a conductive material, such as Al, since the conductive material has a greater thermal conductivity than the insulator. However, an insulating layer  551  can be formed on a front surface  550   a  of the chassis base  550  since serious problems with the plasma discharge could arise if the conductive material is exposed to the discharge cell  426 . The barrier ribs  415  and the fluorescent layer  425  are formed on a front surface  551   a  of the insulating layer  551 . 
     Furthermore, the front surface  551   a  of the insulating layer  551  is preferably covered by an MgO film (not shown) since the MgO film emits many secondary electrons that facilitate the plasma discharge. 
     The method of manufacturing the plasma display module according to the present modified version is identical or similar to the method of manufacturing the plasma display module described in the first embodiment. However, the present modified embodiment is different from the second embodiment in that, in the operation (a), the chassis base  550  formed of a conductive material must be prepared and the insulating layer  551  is formed on a front surface of the chassis base  550 . 
     Elements that are not described in the first modified version of the second embodiment are identical to the elements of the second embodiment. 
     A second modified version of the second embodiment with respect to mainly the difference from the second embodiment will now be described with reference to  FIG. 29 . The difference of the present second modified embodiment from the second embodiment is that address electrodes  622  are formed on an upper surface  450   a  of the chassis base  450 . 
     The address electrodes  622  are extended to cross front discharge electrodes  613  and rear discharge electrodes  612  extended in a direction, and are covered by a dielectric layer  623 . The barrier ribs  415  and the fluorescent layer  425  are formed on a front surface  623   a  of the dielectric layer  623 . 
     The plasma display module according to the present second modified embodiment of the second embodiment is manufactured in the following method. The method includes: (a) preparing a substrate  411  formed of a transparent insulator and a chassis base  450  formed of an insulator; (b) forming address electrodes  622  on a front surface  450   a  of the chassis base  450 ; (c) forming a dielectric layer  623  covering the address electrodes  622 ; (d) alternately forming the barrier rib layers and electrodes on a front surface  623   a  of the dielectric layer  623 ; (e) forming the fluorescent layer  425  on a front surface  623   a  of the dielectric layer  623  in the discharge cells  426  defined by barrier ribs  415  formed on the barrier rib layers; (f) filling a discharge gas in a space formed by coupling the substrate  411  and the chassis base  450  after sealing the space. 
     The operation (a) of the present modified embodiment is identical to the operation (a) of the second embodiment, the operation (b) is different from the second embodiment in that the sequence of forming the address electrodes is different, the dielectric layer in the operation (c) is formed by a method at least similar to the method of forming the barrier rib layer in the second embodiment, the operation (d) of the present modified embodiment is different from the operation (b) of the second embodiment in that an address electrode and one barrier rib layer are not formed in the present modified embodiment, the operation (e) is different from the operation (c) of the second embodiment in that the location of the fluorescent layer  425  is different, and the operation (f) is identical to the operation (d) of the second embodiment. 
     The second modified version of the second embodiment can be combined with the first modified version of the second embodiment. In this case, the chassis base  450  is formed of a conductive material and an insulating layer is formed on a front surface  450   a  of the chassis base  450 . The barrier ribs  415  and the fluorescent layer  425  are formed on a front surface of the insulating layer. 
     Elements that are not described in the second modified version of the second embodiment are identical to the elements of the second embodiment. 
     A third modified version of the second embodiment with respect to mainly the differences from the second embodiment will now be described with reference to  FIG. 30 . The difference of the present modified version from the second embodiment is that the present modified version does not have the address electrodes  422 . 
     Only two discharge electrodes can generate a discharge in a specific discharge cell  426 . Therefore, the address electrodes  422  are not a requisite for generating a discharge in the discharge cell  426 . However, if there is no address electrode, front discharge electrodes  713  and rear discharge electrodes  712  are extended to cross each other, so that a discharge cell  726 , in which the discharge occurs, can be selected. The structure of the electrodes is shown in  FIG. 22 . 
     In the present third modified version, only three barrier rib layers are required to dispose the electrodes between the barrier rib layers since there is no address electrode, and only one barrier rib layer can work in the foremost and rearmost discharge cells since the foremost and the rearmost barrier rib layers are unnecessary. In this case, the one barrier rib layer is disposed between the front discharge electrode  713  and the rear discharge electrode  712 . 
     The description of a method of manufacturing the plasma display module according to the second modified version of the second embodiment will be omitted since the method is similar to the method of manufacturing the plasma display module according to the second embodiment. 
     The third modified version of the second embodiment can be combined with the first modified version of the second embodiment. 
     Elements that are not described in the third embodiment of the second embodiment are identical to the elements of the second embodiment. 
     The present invention provides a plasma display module that can improve the emission efficiency of light. 
     The present invention also provides a plasma display module that can generate a discharge quickly and reduce an address voltage. 
     The present invention also provides a plasma display module that can be manufactured at lower costs and failure rates. In particular, a rear substrate, which is requisite for a conventional PDP, is not included in the plasma display module according to the present invention, thereby reducing manufacturing cost. 
     While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.