Formation of a dielectric layer incorporating green, blue and red colorants on an upper substrate of a plasma display panel

Abstract

Disclosed are an upper substrate structure for a plasma display panel including a dielectric layer reinforcing color properties and a fabricating method thereof. The upper substrate structure comprises a sustain electrode formed on an upper glass substrate, a bus electrode formed on the sustain electrode, and an upper substrate dielectric layer formed over a lower part of the surface created by two electrodes and the glass substrate. There is also included a colorant having color properties of red, blue, and green colors, and a protection layer formed on the dielectric layer. The dielectric layer may include one or more colorants so that important properties of PDP such as selective brightness of desired color, color temperature, and color purity improvement can be controlled.

1. A method for fabricating an upper substrate for a plasma display panel comprising the steps of:
 depositing indium tin oxide (ITO) on an upper glass substrate, and patterning the same to form a sustain electrode;    forming a bus electrode on some upper part of the sustain electrode;    forming an upper substrate dielectric layer including colorant which reinforces color properties of red, blue, and green colors on a lower entire surface of the sustain electrode, the bus electrode, and the upper glass substrate; and    forming a protection layer on a lower part of the dielectric layer;    wherein the upper dielectric layer is formed by mixing 45˜70% of PbO, 1˜10% of SiO 2 , 5˜30% of B 2 O 3 , 0.1˜5% of Al 2 O 3 , and 0.1˜25% of colorant.    
     
     
       2. The method of  claim 1 , wherein the upper substrate dielectric layer is formed to be a single layer by mixing a kind of colorant having red, green, and blue color property in glass powder, or mixing two or more kinds of colorants of same color type having red, green, blue property in the step of forming the upper substrate dielectric layer. 
     
     
       3. The method of  claim 1 , wherein the upper substrate dielectric layer is formed to be multiple layers which are colored by different colors from each other by forming dielectric layers including colorants of different color type having red, green, and blue color property alternately in the step of forming the upper substrate dielectric layer. 
     
     
       4. The method of  claim 1 , wherein the colorant uses one or more kinds among Nd 2 O 3 , CoO, and Co 3 O 4  representing blue color, Fe 2 O 3 , Er 2 O 3  representi red color, and NiO, Cr 2 O 3 , Pr 2 O 3  representing green color after mixing them, and the upper substrate dielectric layer is a single layer including a kind of colorant among the red, green, and blue colors, a single layer including two or more kinds of colorants in the same layer, or multiple layers including dielectric layers mixing colorants of different color type having red, green, and blue properties alternately. 
     
     
       5. The method of  claim 1 , wherein the colorant uses one or more kinds among Nd 2 O 3 , CoO, and Co 3 O 4  representing blue color, Fe 2 O 3 , Er 2 O 3  representing red color, and NiO, Cr 2 O 3 , Pr 2 O 3  representing green color after mixing them in the step of forming the upper substrate dielectric layer. 
     
     
       6. A method for fabricating an upper substrate for a plasma display panel comprising the steps of:
   forming a sustain electrode on an upper class substrate;        forming a bus electrode on the sustain electrode; and        forming an upper substrate dielectric layer comprising a red colorant, a blue colorant, and a green colorant on surfaces of the upper glass substrate, the sustain electrode, and the bus electrode,        wherein the upper substrate dielectric layer is formed by mixing  45  to  70  percent of PbO,  1  to  10  percent of SiO   2   ,  5  to  30  percent of B   2   O   3   ,  0 . 1  to  5  percent of Al   2   O   3   , and  0 . 1  to  25  percent of the red colorant, the blue colorant and the green colorant.     
     
     
       7. The method of  claim 6 , wherein a thickness of the upper dielectric layer ranges between  30  and  40  μm. 
     
     
       8. The method of  claim 6 , wherein the blue colorant comprises CO 3   O   4 . 
     
     
       9. The method of  claim 6 , wherein the green colorant comprises NiO. 
     
     
       10. The method of  claim 6 , wherein the red colorant comprises Fe 2   O   3 . 
     
     
       11. The method of  claim 6 , wherein the upper substrate dielectric layer is formed in a single layer. 
     
     
       12. The method of  claim 6 , wherein the upper substrate dielectric layer is formed in multiple layers. 
     
     
       13. The method of  claim 6 , wherein the red colorant, the blue colorant or the green colorant comprises a transition metal element oxide. 
     
     
       14. The method of  claim 6 , wherein the red colorant, the blue colorant or the green colorant comprises a rare earth element oxide. 
     
     
       15. The method of  claim 6 , wherein the blue colorant is selected from the group consisting essentially of Nd 2   O   3   , CoO, and Co   3   O   4 . 
     
     
       16. The method of  claim 15 , wherein the forming the upper substrate dielectric layer comprises applying  0 . 1  to  2  percent of the green colorant to the upper substrate dielectric layer when Nd 2   O   3    is used as the blue colorant.   
     
     
       17. The method of  claim 6 , wherein the red colorant is selected from the group consisting essentially of Fe 2   O   3    and Er   2   O   2 . 
     
     
       18. The method of  claim 6 , wherein the green colorant is selected from the group consisting essentially of NiO, Cr 2   O   3   , and Pr   2   O   3 .