Black paste and plasma display panel and method for preparation thereof

Abstract

A black paste contains an organic component and an inorganic powder containing a glass powder and a cobalt oxide. A plasma display panel having a black layer made from the black paste, and methods for fabricating the black paste, the plasma display are also provided.

What is claimed is:  
     
         1 . A black paste comprising an inorganic powder and an organic component, the inorganic powder comprising a glass powder and a cobalt oxide.  
     
     
         2 . The black paste according to  claim 1 , the organic component comprising an acrylic copolymer, an acrylic monomer, and a photopolymerization initiator.  
     
     
         3 . The black paste according to  claim 2 , wherein the acrylic copolymer is alkali-soluble.  
     
     
         4 . The black paste according to  claim 1 , wherein the cobalt oxide comprises cobalt(II, III) oxide (Co 3 O 4 ).  
     
     
         5 . The black paste according to  claim 1 , wherein the average particle diameter of the cobalt oxide is in the range of 10 to 100 nm.  
     
     
         6 . The black paste according to  claim 1 , wherein the content of the cobalt oxide is 10 to 70 percent by weight of the total content of the inorganic powder.  
     
     
         7 . The black paste according to  claim 1 , wherein the softening point of the glass powder is in the range of 400 to 520° C.  
     
     
         8 . The black paste according to  claim 1 , wherein the glass powder mainly contains bismuth oxide.  
     
     
         9 . The black paste according to  claim 1 , further comprising a conductive powder.  
     
     
         10 . The black paste according to  claim 9 , wherein the conductive powder comprises nickel.  
     
     
         11 . A plasma display panel comprising a front panel and a rear panel, the front panel comprising a black layer and a first metal electrode, the rear panel comprising a second electrode, wherein the black layer comprises a cobalt oxide and a glass component.  
     
     
         12 . The plasma display panel according to  claim 11 , wherein the cobalt oxide comprises cobalt(II, III) oxide (Co 3 O 4 ).  
     
     
         13 . The plasma display panel according to  claim 11 , wherein the black layer contains 10 to 70 percent by weight of the cobalt oxide.  
     
     
         14 . The plasma display panel according to  claim 11 , wherein the softening point of the glass component is in the range of 400 to 520° C.  
     
     
         15 . The plasma display panel according to  claim 11 , wherein the black layer comprises a conductive powder.  
     
     
         16 . The plasma display panel according to  claim 15 , wherein the conductive powder comprises nickel.  
     
     
         17 . The plasma display panel according to  claim 11 , wherein the glass component mainly contains bismuth oxide.  
     
     
         18 . A plasma display panel comprising a front panel and a rear panel, the front panel comprising a black layer and a first metal electrode, the rear panel comprising a second electrode, wherein the black layer is formed of the black paste of  claim 1 .  
     
     
         19 . A method for fabricating a plasma display panel comprising a front panel and a rear panel, the front panel comprising a black layer and a first metal electrode, the rear panel comprising a second electrode, the method comprising forming the black layer using a black paste containing 10 to 70 percent by weight of a cobalt oxide relative to the total content of the inorganic powder.  
     
     
         20 . The method according to  claim 19 , wherein the step of forming the black layer includes applying the black paste on a glass substrate, applying a photosensitive silver paste on the applied black paste, exposing the applied pastes through a mask, and developing the exposed pastes with an alkali aqueous solution.  
     
     
         21 . A method for making a plasma display panel comprising a front panel and a rear panel, the front panel comprising a black layer and a first metal electrode, the rear panel comprising a second electrode, the method comprising forming the black layer using the black paste of  claim 1.