Plasma display panel

Abstract

A plasma display panel includes a front substrate and a rear substrate that are opposed to each other with a discharge gas space between them, and a sealing material for sealing the front substrate and the rear substrate at their peripheral portions. The sealing material contains an appropriate quantity of spacers so that a thickness of the plasma display panel is uniform along the entire perimeter of the sealing portion between the front substrate and the rear substrate. The sealing material contains non-porous beads as the spacers, preferably at a ratio within the range of 0.05-2.0 wt %.

1 . A plasma display panel comprising: 
 a front substrate and a rear substrate that are opposed to each other with a discharge gas space between them;    a structural member for defining a thickness of the discharge gas space in a screen area; and    a sealing material for sealing the front substrate and the rear substrate at their peripheral portions, wherein the sealing material contains non-porous bead spacers.    
     
     
         2 . A plasma display panel comprising: 
 a front substrate and a rear substrate that are opposed to each other with a discharge gas space between them;    a structural member for defining a thickness of the discharge gas space in a screen area; and    a sealing material for sealing the front substrate and the rear substrate at their peripheral portions, the sealing material containing spacers that define a distance between the front substrate and the rear substrate, wherein the spacers are non-porous bead spacers contained in the sealing material at a ratio within the range of 0.05-2.0 wt %.    
     
     
         3 . The plasma display panel according to  claim 2 , wherein the sealing material is a burned material of low melting point glass paste, and the bead spacers are non-porous glass beads having a softening point higher than that of the sealing material.  
     
     
         4 . The plasma display panel according to  claim 3 , wherein the sealing material has strength as being not broken down even by a pressure of 0.70 kgf/cm 2  that is applied to the front substrate or the rear substrate so as to compress the sealing material.  
     
     
         5 . The plasma display panel according to  claim 4 , wherein the sealing material has a frame-like shape with a width within the range of 8-12 millimeters.  
     
     
         6 . The plasma display panel according to  claim 1 , wherein grain sizes of the bead spacers contained in the sealing material have values within the range of ⅚-1.5 times a design value of a distance between the front substrate and the rear substrate.  
     
     
         7 . The plasma display panel according to  claim 2 , wherein grain sizes of the bead spacers contained in the sealing material have values within the range of ⅚-1.5 times a design value of the distance between the front substrate and the rear substrate.  
     
     
         8 . A method for manufacturing a plasma display panel including a front substrate and a rear substrate that are opposed to each other with a discharge gas space between them, and a structural member for defining a thickness of the discharge gas space in a screen area, the method comprising the steps of: 
 making the front substrate and the rear substrate individually;    applying low melting point glass paste containing non-porous bead spacers at a ratio within the range of 0.05-2.0 wt % to glass frit onto a peripheral portion of the front substrate or the rear substrate so that the low melting point glass paste forms a frame-like shape having a height greater than that of the structural member;    assembling the front substrate and the rear substrate in face-to-face relation with each other; and    burning the low melting point glass paste while vacuuming a discharge gas space between the front substrate and the rear substrate so as to seal the front substrate and the rear substrate at their peripheral portions.    
     
     
         9 . The method according to  claim 8 , wherein the low melting point glass paste is applied so that it forms a frame-like shape having a height greater than that of the structural member and a width within the range of 3.0-5.0 millimeters.