USRE37183EExpiredUtilityPatentIndex 92

Image display panel having antistatic film with transparent and electroconductive properties and process for processing same

Assignee: HITACHI LTDPriority: Dec 10, 1987Filed: Dec 8, 1997Granted: May 22, 2001

Est. expiryDec 10, 2007(expired)· nominal 20-yr term from priority

Inventors:KAWAMURA HIROMITSU KAWAMURA TAKAO KOBARA KATSUMI ENDO YOSHISHIGE

H01J 29/868H01J 2229/8913C03C 2217/465C03C 2217/211C03C 2217/734C03C 2218/154H01J 29/28C03C 2218/116C03C 2218/113C03C 17/007C03C 2217/732C03C 2217/213C03C 2217/478C03C 2217/77C03C 2217/215C03C 2217/452C03C 2217/476C03C 2217/48H01J 29/86

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Claims

Abstract

There are disclosed an image display panel having an antistatic film comprising a SiO2 coat of transparent and electroconductive properties on the front surface of said panel; the coat containing fine particles of at least one compound selected from electroconductive metal oxides and hygroscopic metal salts; and a process for producing the same.

Claims

exact text as granted — not AI-modified

What is claimed is:

1. An image display panel having an antistatic film coat comprising a SiO 2 coat of transparent and electroconductive properties on the front surface of said panel; said coat containing fine particles exhibiting or capable of absorbing moisture to impart electroconductivity, all of said fine particles exhibiting or capable of absorbing moisture to impart electroconductivity consisting essentially of at least one compound selected from electroconductive metal oxides and hygroscopic metal salts capable of absorbing moisture to impart electroconductivity to said coat.

2. The image display panel of claim 1 , wherein the antistatic coat itself either has the non-glare function or is overlaid with a non-glare coat.

3. The image display panel of claim 2 , wherein the non-glare coat overlaid on said antistatic coat comprises a thin SiO 2 film which contains fine SiO 2 particles of 100-10,000 Å in diameter; said particles being coated by said film so as to fix on the surface of said panel.

4. The image display panel of claim 3 , wherein the thickness of said antistatic coat is up to 2000 Å and the amount of fine SiO 2 particles contained in the non-glare coat is in a range of 0.01-1 mg/cm 2 .

5. The image display panel of claim 4 , wherein the thickness of the antistatic coat is 50-500 Å and the amount of said fine SiO 2 particles is in a range of 0.1-0.3 mg/cm 2 .

6. The image display panel of claim 1 , wherein said at least one compound is one selected from the group consisting of tin oxide, indium oxide, antimony oxide, chlorides, nitrates, sulfates, and carboxylates of metals of groups II and III of the periodic table.

7. The image display panel of claim 1 , wherein the content of said at least one compound in said SiO 2 film is in a range of 0.01-1.0 mg/cm 2 area of the film.

8. The image display panel of claim 1 , wherein the antistatic coat is formed as a thin SiO 2 film having also reflection inhibitory function and containing further fine SiO 2 particles of 100-10,000 Å in diameter in addition to said at least one compound.

9. The image display panel of claim 8 , wherein said at least one compound is one selected from the group consisting of salts of metals of the groups II and III of the periodic table, tin oxide, indium oxide and antimony oxide.

10. The image display panel of claim 8 , wherein said SiO 2 film contains 0.01 to 1.0 mg/cm 2 of said fine SiO 2 particles and 0.01 to 1.0 mg/cm 2 of said compound, respectively.

11. The image display panel of claim 10 , wherein the amount of said fine SiO 2 particles contained is 0.1-0.3 mg/cm 2 and the amount of said at least one compound of fine particles contained is 0.15-0.3 mg/cm 2 .

12. The image display panel of claim 2 , wherein the antistatic coat has itself a non-glare function, and said antistatic coat has fine projections on its surface and contains fine particles of at least one metal oxide selected from SnO 2 , In 2 O 3 and Sb 2 O 3 .

13. The image display panel of claim 1 , wherein said antistatic coat contains fine particles of at least one electroconductive metal oxide selected from SnO 2 , In 2 O 3 , and Sb 2 O 3 and said SiO 2 coat is formed by applying an alcoholic solution of alkoxysilane [Si(OR 1 ) 4 , wherein R 1 is alkyl] on the front surface of panel, followed by heat treatment of the resulting coat at temperatures of up to 200° C.

14. The image display panel of claim 1 , wherein said at least one compound is selected from the group consisting of tin oxide, indium oxide and antimony oxide.

15. The image display panel of claim 1 , wherein said at least one compound is selected from the group consisting of chlorides, nitrates, sulfates and carboxylates of metals of groups II and III of the Periodic Table.

16. A process for producing image display panels which comprises applying a suspension of fine particles of at least one of electroconductive metal oxides and hygroscopic metal salts in an alcoholic solution of alkoxysilane on the front surface of panel, followed by heat treatment of the resulting coat to form an antistatic film comprising a transparent electroconductive SiO 2 coat on the front surface.

17. The process of claim 16 which comprises forming further a non-glare film on the antistatic film.

18. The process of claim 17 , wherein the formation of a non-glare film comprises the steps of; dispersing fine SiO 2 particles of 100-10,000 Å in diameter in an alcoholic solution of alkoxysilane Si(OR 1 ) 4 , wherein R 1 is alkyl, applying the suspension on the antistatic film which is the transparent substrate formed on the panel; and heating the resulting coat to decompose the Si(OR 1 ) 4 , forming a thin SiO 2 film, therewith covering and fixing the fine SiO 2 particles.

19. The process of claim 18 wherein the hygroscopic metal salts are chlorides, nitrates, sulfates, and carboxylates of metals of groups II and III of the period table and the transparent conductive metal oxides are of tin, indium, and antimony.

20. The process of claim 16 , wherein said suspension is prepared by dissolving or dispersing 0.05-7% by weight of the metal oxide or metal salt in the alcoholic solution of alkoxysilane.

21. The process of claim 16 , wherein the first step comprises applying the suspension prepared by further adding a ketone or ethyl Cellosolve as a dispersing medium for the metal salt and metal oxide to the alcoholic solution and also adding water and, as a catalyst, an inorganic acid for facilitating the hydrolysis of Si(OR 1 ) 4 .

22. The process of claim 18 , wherein said suspension is prepared by dispersing 0.1-10% by weight of the fine SiO 2 particles in the alcoholic solution of Si(OR 1 ) 4 .

23. The process of claim 18 or 22 , wherein R 1 of the alcoholic solution is ethyl alcohol.

24. The process of claim 22 , wherein said suspension is prepared by further adding a ketone or ethyl Cellosolve as a dispersing medium for the fine SiO 2 particles and also adding water and an inorganic acid for facilitating the hydrolysis of Si(OR 1 ) 4 .

25. The process of claim 16 , which said suspension is applied by spin coating, dip coating, spray coating, or combination of these coating methods and the heat treatment of coating surface is conducted at 50°-200° C.

26. The process of claim 16 , wherein said antistatic film is formed by the steps which comprises dispersing fine SiO 2 particles of 100-10,000 Å in diameter in an alcoholic solution of Si(OR 1 ) 4 wherein R 1 is alkyl; and also dispersing particles of at least one compound selected from hygroscopic metal salts and electroconductive metal oxides, applying the resulting suspension on the antistatic film, heating the resulting coat to decompose the Si(OR 1 ) 4 and forming a thin SiO 2 film to coat fine SiO 2 particles in order to fix them on the surface of said panel, whereby said antistatic film also has a non-glare function.

27. The process of claim 27 , wherein said at least one compound is one selected from the group consisting of chlorides, nitrates, sulfates, carboxylates of metals of groups II and III of the periodic table and the oxides of tin, indium, and antimony.

28. The process of claim 27 the said fine SiO 2 particles in the alcoholic solution of Si(OR 1 ) 4 is contained from 0.1 to 10% by weight and said at least one compound in that solution is from 0.05 to 7% by weight.

29. The process of claim 28 , wherein said fine SiO 2 particles is contained in a range of from 1 to 3% by weight and said at least one compound from 1.0 to 2.0% by weight.

30. The process of claim 26 , wherein R 1 of the Si(OR 1 ) 4 is ethyl and the alcohol component of the alcoholic solution consists mainly of ethyl alcohol.

31. The process of claim 30 , wherein said suspension is prepared by further adding a ketone as a dispersing medium for the fine SiO 2 particles to the alcoholic solution, water and an inorganic acid, as a catalyst, for facilitating the hydrolysis of Si(OR 1 ) 4 .

32. The process of claim 26 , wherein said suspension is applied by spin coating, dip coating, spray coating, or combination of these coating methods and the heat treatment of coating surface if conducted at 50°-200° C.

33. The process of claim 17 , wherein said antistatic film is formed on the front surface of an image display panel by applying an alcoholic Si(OR 1 ) 4 solution, wherein R 1 is alkyl, containing at least one of SnO 2 , In 2 O 3 , and Sb 2 O 3 on the front surface, and burning the coat preliminarily, and further said nonglare film is formed on the preliminarily burnt coat by applying an alcoholic solution of Si(OR 1 ) 4 by spray coating, and burning the whole coat fully, thereby forming film projections of SiO 2 at the outermost surface.

34. The process of claim 16 , wherein the suspension is a dispersion of fine particles of at least one of SnO 2 , In 2 O 3 , and Sb 2 O 3 in an alcoholic solution of alkoxysilane Si(OR 1 ) 4 , wherein R 1 is alkyl, and the heat treatment is carried out at temperatures of up to 200° C.

35. The process of claim 6 , wherein said suspension includes an electroconductive metal oxide selected from the group consisting of tin oxide, indium oxide and antimony oxide.

36. The process of claim 16 , wherein said suspension includes a hygroscopic metal salt selected from the group consisting of chlorides, nitrates, sulfates and carboxylates of metals of groups II and III of the Periodic Table.

37. The image display panel of claim 1 , wherein said fine particles exhibiting or capable of absorbing moisture to impart electroconductivity consist essentially of electroconductive metal oxides.

38. The image display panel of claim 37 , wherein the antistatic coat itself either has the non- glare function or is overlaid with a non - glare coat.

39. The image display panel of claim 37 , wherein the antistatic coat is overlaid with a non- glare coat.

40. The image display panel of any of claims 37 to 39 , wherein the content of said at least one compound in said SiO 2 film is in the range of 0 . 1 - 1 . 0 mg/cm 2 area of the film.

41. The image display panel of any of claims 37 to 39 , wherein the content of said at least one compound in said SiO 2 film is in the range of 0 . 15 - 0 . 3 mg/cm 2 area of the film.

42. The image display panel of any of claims 37 to 39 , wherein said antistatic coat has itself a non- glare function, and said antistatic coat has fine projections on its surface and contains fine particles of at least one metal oxide selected from SnO 2 , In 2 O 3 and Sb 2 O 3 .

43. The image display panel of any one of claims 37 and 39 , wherein said fine particles consist essentially of at least one metal oxide selected from SnO 2 , In 2 O 3 and Sb 2 O 3 .

44. The image display panel of claim 37 , wherein said antistatic coat contains fine particles of at least one electroconductive metal oxide selected from SnO 2 , In 2 O 3 and Sb 2 O 3 and said SiO 2 coat is formed by applying an alcoholic solution of alkoxysilane ( Si ( OR 1 )) 4 , wherein R 1 is alkyl on the front surface of panel, followed by heat treatment of the resulting coat at temperatures of up to 200 ° C.

45. The image display panel of claim 39 , wherein said fine particles consist essentially of at least one metal oxide selected from SnO 2 , In 2 O 3 and Sb 2 O 3 ; and wherein said antistatic coat has a thickness up to 2000 Å.

46. The image display panel of claim 45 , wherein said antistatic coat has a thickness of 50 - 500 Å.

47. The image display panel of claim 37 , wherein said antistatic coat is overlaid with a SiO 2 film.

48. The image display panel of claim 47 , wherein said SiO 2 film has fine projections.

49. The image display panel of claim 47 , wherein said fine particles consist essentially of at least one metal oxide selected from SnO 2 , In 2 O 3 and Sb 2 O 3 ; and wherein said antistatic coat has a thickness up to 2000 Å.

50. The image display panel of claim 47 , wherein said antistatic coat has a thickness of 50 - 500 Å.

51. The image display panel of claim 48 , wherein said fine particles consist essentially of at least one metal oxide selected from SnO 2 , In 2 O 3 and Sb 2 O 3 ; and wherein said antistatic coat has a thickness up to 2000 Å.

52. The image display panel of claim 48 , wherein said antistatic coat has a thickness of 50 - 500 Å.

53. An image display panel having an antistatic film comprising a SiO 2 coat of transparent and electroconductive properties on the front surface of said panel; said coat containing fine particles of at least one compound selected from electroconductive metal oxides and hygroscopic metal salts capable of absorbing moisture to impart electroconductivity to said coat, wherein said antistatic cost is produced by applying a suspension of fine particles of at least one of electroconductive metal oxides and hygroscopic metal salts in an alcoholic solution of alkoxysilane on the front surface of panel, followed by heat treatment of the resulting coat to form an antistatic film comprising a transparent electroconductive SiO 2 coat on the front surface.

54. The image display panel of claim 53 , wherein the heat treatment of the resulting coat is conducted at 50 °- 200 ° C.

55. The image display panel of claim 53 , wherein the heat treatment of the resulting coat is conducted at 160 °- 180 ° C.

56. The image display panel of claim 53 , wherein the heat treatment of the resulting coat is conducted without reaching a temperature of 500 ° C.

57. An image display panel having an antistatic film comprising a SiO 2 coat of transparent and electroconductive properties on the front surface of said panel; said coat containing fine particles of at least one compound selected from electroconductive metal oxides and hygroscopic metal salts capable of absorbing moisture to impart electroconductivity to said coat, wherein said antistatic cost is produced by applying a suspension of fine particles of at least one of electroconductive metal oxides and hygroscopic metal salts in a solution of alkoxysilane on the front surface of panel, followed by heat treatment of the resulting coat without reaching a temperature of 500 ° C. to form an antistatic film comprising a transparent electroconductive SiO 2 coat on the front surface.

58. The image display panel of claim 57 , wherein the heat treatment of the resulting coat is conducted at 50 °- 200 ° C.

59. The image display panel of claim 57 , wherein the heat treatment of the resulting coat is conducted at 160 °- 180 ° C.

60. The image display panel of any of claims 1 - 15 , wherein said image display is a cathode ray tube.

61. The image display panel of any of claims 37 to 39 , wherein said image display is a cathode ray tube.

62. The image display panel of claim 40 , wherein said image display is a cathode ray tube.

63. The image display panel of claim 41 , wherein said image display is a cathode ray tube.

64. The image display panel of claim 42 , wherein said image display is a cathode ray tube.

65. The image display panel of claim 43 , wherein said image display is a cathode ray tube.

66. The image display panel of any of claims 44 to 59 , wherein said image display is a cathode ray tube.

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