USRE40647EExpiredUtility

Method of producing plasma display panel with protective layer of an alkaline earth oxide

47
Assignee: MATSUSHITA ELECTRIC INDUSTRIAL CO LTDPriority: Dec 15, 1995Filed: Nov 29, 2001Granted: Mar 10, 2009
Est. expiryDec 15, 2015(expired)· nominal 20-yr term from priority
Inventors:Masaki AokiHideo ToriiEiji FujiiMitsuhiro OhtaniTakashi InamiHiroyuki KawamuraHiroyoshi TanakaRyuichi MuraiYasuhisa IshikuraYutaka NishimuraKatsuyoshi Yamashita
C23C 16/404H01J 2211/38H01J 11/40H01J 11/38H01J 11/50H01J 2211/50H01J 9/02H01J 2211/40C23C 16/403H01J 11/12Y10T117/1008Y10T117/1004
47
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Cited by
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References
54
Claims

Abstract

The first object of the present invention is to provide a PDP with improved panel brightness which is achieved by improving the efficiency in conversion from discharge energy to visible rays. The second object of the present invention is to provide a PDP with improved panel life which is achieved by improving the protecting layer protecting the dielectrics glass layer. To achieve the first object, the present invention sets the amount of xenon in the discharge gas to the range of 10% by volume to less than 100% by volume, and sets the charging pressure for the discharge gas to the range of 500 to 760 Torr which is higher than conventional charging pressures. With such construction, the panel brightness increases. Also, to achieve the second object, the present invention has, on the surface of the dielectric glass layer, a protecting layer consisting of an alkaline earth oxide with (100)-face or (110)-face orientation. The protecting layer, which may be formed by using thermal Chemical Vapor Deposition (CVD) method, plasma enhanced CVD method, or a vapor deposition method with irradiation of ion or electron beam, will have a high sputtering resistance and effectively protect the dielectrics glass layer. Such a protecting layer contributes to the improvement of the panel life.

Claims

exact text as granted — not AI-modified
1. A method of producing a PDP, the method comprising:
 a first step of forming a front cover plate by forming a first electrode and a dielectric glass layer on a front glass substrate then forming a protecting layer of an alkaline earth  a magnesium oxide with one  of (100)-face orientation and  (110)-face orientation on the dielectric glass layer; and  
 a second step of forming a back plate by forming a second electrode and a fluorescent substance layer on a back glass substrate then bonding the front cover plate, on which the protecting layer has been formed, with the back plate, and charging a gas medium into a plurality of discharge spaces which are formed between the front cover plate and the back plate, the front cover plate and the back plate facing to each other.  
 
     
     
       2. The method of producing a PDP of  claim 1 , wherein
 in the first step, the protecting layer is formed with one of a thermal Chemical Vapor Deposition method and a plasma Chemical Vapor Deposition method by using an alkaline earth  a magnesium organometallic compound and oxygen.  
 
     
     
       3. The method of producing a PDP of  claim 2 , wherein
 the alkaline earth  magnesium organometallic compound used in the first step is one of an alkaline earth metal chelate compound and an alkaline earth cyclopentadienyl compound.  
 
     
     
       4. The method of producing a PDP of  claim 3 , wherein
 the alkaline earth organometallic compound used in the first step is one of M(C 11 H 19 O 2 ) 2 , M(C 5 H 7 O 2 ) 2 , M(C 5 H 5 F 3 O 2 ) 2 , and M(C 5 H 5 ) 2 , wherein M represents one of  magnesium, beryllium, calcium, strontium, and barium .  
 
     
     
       5. A method of producing a plasma display panel having a plurality of discharge space cells with a front substrate and a rear substrate and walls separating each cell, each discharge space is addressable by display electrodes to cause the cell to emit light comprising:
 depositing a protective layer of an alkaline earth  a magnesium oxide having one of a (100) crystal face orientation and  a (110) crystal face orientation extending across a top surface of each cell; and  
 charging each cell with a discharge gas.  
 
     
     
       6. The plasma display panel method of  claim 5  wherein each cell is pressurized to pressure of approximately 500 to 760 Torrs. 
     
     
       7. The plasma display panel method of  claim 6  wherein each cell is charged with an xenon discharge gas between 10% by volume to approximately 100% by volume. 
     
     
       8. The plasma display panel method of  claim 7  wherein one of argon, kryptor, helium and neon is mixed with the xenon. 
     
     
       9. The plasma display panel method of  claim 7  wherein one of argon and krypton is mixed with the xenon in sufficient volume to provide ultraviolet light emission at a wavelength of 173 nm. 
     
     
       10. The plasma display panel method of  claim 7  wherein two additional discharge gases within the range of 10% to 50% by volume are mixed with the xenon. 
     
     
       11. The plasma display panel method of  claim 6  wherein a distance between adjacent display electrodes in the same plane is no greater than 0.1 mm. 
     
     
       12. The plasma display panel method of  claim 5  wherein the protective layer is selected from a group consisting of MgO, BeO, CaO, SrO and BaO. 
     
     
       13. The plasma display panel method of  claim 5  wherein the protective layer is magnesium oxide with a crystal face orientation of(110). 
     
     
       14. The plasma display panel method of  claim 5 , wherein the first substrate includes a dielectric glass layer and the dielectric glass layer is heated to a temperature between 350° C. to 400° C. during the depositing of the protective layer by a thermal chemical vapor deposition. 
     
     
       15. The plasma display panel method of  claim 5 , wherein the front substrate includes a dielectric glass layer and the dielectric glass layer is heated to a temperature between 250° C. to 300° C. during the depositing of the protective layer by a plasma enhanced chemical vapor deposition. 
     
     
       16. The plasma display panel method of  claim 5 , wherein the front substrate includes an upper glass plate and a lower dielectric glass layer, and display electrodes are formed from depositing a conductive paste on the upper glass plate, the paste is then baked to harden it and subsequently is sandwiched with the lower dielectric glass layer. 
     
     
       17. The plasma display panel method of  claim 5 , wherein the protective layer is deposited by transferring a paste of the alkaline earth oxide to the front substrate and baking it. 
     
     
       18. The plasma display panel method of  claim 17 , wherein the paste is a magnesium salt with a plate-shaped crystal structure. 
     
     
       19. The plasma display panel method of  claim 18 , wherein the paste is magnesium oxalate formed by dissolving ammonium oxalate in a magnesium chloride aqueous solution and heating it to form the plate-shaped crystal structure. 
     
     
       20. The plasma display panel method of  claim 5 , wherein the depositing of the protective layer is made by evaporating the alkaline earth oxide with an ion/electron beam in a vacuum. 
     
     
       21. A method of producing a plasma display panel having a plurality of discharge space cells, each discharge space cell is addressable by display electrodes to cause the cells to emit light, comprising:
 depositing a protective layer of an alkaline earth compound selected from the group consisting of M(C 11 H 19 O 2 ) 2 , M(C 5 H 7 O 2 ) 2 , M(C 5 H 5 F 3 O 2 ) 2 , and M(C 5 H 5 ) 2 , wherein M represents one of magnesium, beryllium, calcium, strontium, and barium, the protective layer having one of a (100) crystal-face orientation and  a (110) crystal-face orientation extending across a surface of each cell; and  
 charging each cell with a discharge gas.  
 
     
     
       22. The plasma display method of  claim 21 , wherein the protective layer is deposited by one of a thermal chemical vapor deposition step and a plasma enhanced chemical vapor deposition step. 
     
     
       23. The plasma display method of  claim 22 , wherein the discharge gas includes at least 10% by volume Xe and is at a pressure of at least 500 Torr. 
     
     
       24. The plasma display method of  claim 23 , wherein the discharge gas includes one of Ar and Kr. 
     
     
       25. The plasma display method of  claim 23  wherein the discharge gas is selected from a group consisting of Ar-He-Xe,  Ar-He-Xe, Kr-Ne-Xe, and Kr-He-Xe and the amount of Kr, Ar, He, or Ne should be in the range of 10% to 50% by volume. 
     
     
       26. The plasma display method of  claim 23 , wherein the alkaline earth compound is selected from the croup consisting of magnesium dipivaloyl methane, magnesium acetylacetone, magnesium trifluoroacetylacetone, and cyclopentadienyl. 
     
     
       27. A method of producing a plasma display panel having a plurality of discharge space cells, each discharge space cell is addressable by display electrodes to cause the cell to emit light, comprising:
 depositing a protective layer selected from the group consisting of magnesium dipivaloyl methane, magnesium acetylacetone, magnesium trifluoroacetylacetone, and cyclopentadienyl magnesium across a surface of each cell to provide one of a (100) crystal-face orientation and  a (110) crystal-face orientation; and  
 charging each cell with a discharge gas including at least 10% by volume Xe at a pressure of at least 500 Torr.  
 
     
     
       28. A method of producing a PDP, the method comprising:
   a first step of forming a front cover plate by forming a first electrode and a dielectric layer on a front glass substrate, then forming a protecting layer of a magnesium oxide with  (   110   )- face orientation on the dielectric layer; and        a second step of forming a back plate by forming a second electrode and a fluorescent substance layer on a back glass substrate;        a third step of bonding the front cover plate with the back plate and introducing a gas medium into a plurality of discharge spaces which are formed between the front cover plate and the back plate, the front cover plate and the back plate facing to each other.     
     
     
       29. The method of  claim 28 , wherein
   in the first step, the protecting layer is formed with one of a thermal Chemical Vapor Deposition method and a plasma Chemical Vapor Deposition method by using a magnesium organometallic compound and oxygen.     
     
     
       30. The method of producing a PDP of  claim 29 , wherein
   the magnesium organometallic compound used in the first step is one of an alkaline earth metal chelate compound and an alkaline earth cyclopentadienyl compound.     
     
     
       31. The method of producing a PDP of  claim 30 , wherein
   the alkaline earth organometallic compound used in the first step is one of M ( C   11   H   19   O   2 ) 2   , M ( C   5   H   7   O   2 ) 2   , M ( C   5   H   5   F   3   O   2 ) 2   , and M ( C   5   H   5 ) 2   , wherein M represents magnesium.     
     
     
       32. A method of producing a plasma display panel having plurality of discharge space cells comprising the steps of:
   depositing a protective layer of a magnesium oxide having a  (   110   )  crystal face orientation on a surface of a dielectric layer of a substrate; and        introducing a discharge gas into each cell.     
     
     
       33. The plasma display panel method of  claim 32 , wherein each cell is pressurized to a pressure of approximately  500  to  750  Torrs. 
     
     
       34. The plasma display panel method of  claim 33 , wherein each cell is charged with a xenon discharge gas between  10 %  volume to approximately  100   %  by volume.   
     
     
       35. The plasma display panel method of  claim 34 , wherein one of argon, krypton, helium, and neon is mixed with the xenon. 
     
     
       36. The plasma display panel method of  claim 34 , wherein one of argon and krypton is mixed with the xenon in sufficient volume to provide ultraviolet light emission at a wavelength of  173  nm. 
     
     
       37. The plasma display panel method of  claim 34 , wherein two additional discharge gases within the range of  10 %  to  50   %  by volume are mixed with the xenon.   
     
     
       38. The plasma display panel method of  claim 33 , wherein a distance between adjacent display electrodes in the same plane is no greater than  0 . 1  mm. 
     
     
       39. The plasma display panel method of  claim 32 , wherein the first substrate includes a dielectric layer and the dielectric layer is heated to a temperature between  350 ° C. to  400 ° C. during the depositing of the protective layer by a thermal chemical vapor deposition. 
     
     
       40. The plasma display panel method of  claim 32 , wherein the front substrate includes a dielectric layer and the dielectric layer is heated to a temperature between  250 ° C. to  300 ° C. during the depositing of the protective layer by a plasma chemical vapor deposition. 
     
     
       41. The plasma display panel method of  claim 32 , wherein the front substrate includes a glass plate and display electrodes are formed by depositing a conductive paste on the glass plate, the paste is then baked to be hardened and the display electrodes subsequently are sandwiched between the glass plate and the dielectric layer. 
     
     
       42. The plasma display panel method of  claim 32 , wherein the protective layer is deposited by transferring a paste of the alkaline earth oxide to the front substrate and baking it. 
     
     
       43. The plasma display panel method of  claim 42 , wherein the paste is magnesium salt with a plate- shaped crystal structure.   
     
     
       44. The plasma display panel method of  claim 43 , wherein the paste is magnesium oxalate formed by dissolving ammonium oxalate in a magnesium chloride aqueous solution and heating it to form the plate- shaped crystal structure.   
     
     
       45. The plasma display panel method of  claim 32 , wherein the depositing of the protective layer is made by evaporating the alkaline earth oxide with an ion/electron beam in a vacuum. 
     
     
       46. A method of producing a plasma display panel having a plurality of discharge space cells comprising:
   depositing a protective layer of an alkaline earth compound selected from the group consisting of M ( C   11   H   19   O   2 ) 2   , M ( C   5   H   7   O   2 ) 2   , M ( C   5   H   5   F   3   O   2 ) 2   , and M ( C   5   H   5 ) 2   , wherein M represents one of magnesium, beryllium, calcium, strontium, and barium, the protective layer having a  (   110   )  crystal - face orientation extending across a surface of each cell; and        introducing a discharge gas into each cell.     
     
     
       47. The plasma display method of  claim 46 , wherein the protective layer is deposited by one of a thermal chemical vapor deposition step and a plasma enhanced chemical vapor deposition step. 
     
     
       48. The plasma display method of  claim 47 , wherein the discharge gas includes at least  10 %  by volume Xe and is at a pressure of at least  500  Torr.   
     
     
       49. The plasma display method of  claim 48 , wherein the discharge gas includes one of Ar and Kr. 
     
     
       50. The plasma display method of  claim 48 , wherein the discharge gas is selected from a group consisting of Ar- He - Xe, Kr - Ne - Xe, and Kr - He - Xe and the amount of Kr, Ar, He, or Ne should be in the range of  10   %  to  50   %  by volume.   
     
     
       51. The plasma display method of  claim 48 , wherein the alkaline earth compound is selected from the group consisting of magnesium dipivaloyl methane, magnesium acetylacetone, magnesium trifluoroacetylacetone, and cyclopentadienyl. 
     
     
       52. A method of producing a plasma display panel having a plurality of discharge space cells comprising the steps of:
   depositing a protective layer selected from the group consisting of magnesium dipivaloyl methane, magnesium acetylacetone, magnesium trifluoroacetylacetone, and cyclopentadienyl magnesium across a surface of each cell to provide a  (   110   )  crystal - face orientation; and        charging each cell with a discharge gas including at least  10   %  by volume Xe at a pressure of at least  500  Torr.     
     
     
       53. In a method of producing a plasma display panel having a plurality of discharge space cells with dielectric layers, the improvement comprising:
   evaporating with an electron gun a magnesium oxide; and        forming a protective layer of the magnesium oxide with  (   110   )  crystal - face orientation on the dielectric layer.     
     
     
       54. The method of  claim 53 , wherein the temperature of the dielectric layer was between  250 ° C. and  300 ° C.

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