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US4945282A
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Image display panel having antistatic film with transparent and electroconductive properties and process for processing same
Assignee: Hitachi Ltd
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Filing: 1988-12-08
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Granted: 1990-07-31
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Expires: 2008-12-08
Abstract
Abstract There are disclosed 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; 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.
Inventors
- 👤 Hiromitsu Kawamura
- 👤 Takao Kawamura
- 👤 Katsumi Kobara
- 👤 Yoshishige Endo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:20
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/28; H01J29/86; C; C03; C03C; C03C17/00; C03C17/006; C03C17/007; H01J29/867; H01J29/868; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/211; C03C2217/213; C03C2217/215; C03C2217/40; C03C2217/43; C03C2217/44; C03C2217/45; C03C2217/452; C03C2217/46; C03C2217/465; C03C2217/47; C03C2217/475; C03C2217/476; C03C2217/478; C03C2217/48; C03C2217/70; C03C2217/73; C03C2217/732; C03C2217/734; C03C2217/77; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/113; C03C2218/116; C03C2218/15; C03C2218/154; H01J2229/00; H01J2229/89; H01J2229/8913
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
54 words
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.
Claim 2
Dependent Claim
54 words
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.
Claim 3
Dependent Claim
24 words
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.
Claim 4
Dependent Claim
50 words
The image display panel of claim 2, wherein said 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.
Claim 5
Dependent Claim
41 words
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 .
Claim 6
Dependent Claim
35 words
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 .
Claim 7
Dependent Claim
43 words
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.
Claim 8
Dependent Claim
33 words
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.
Claim 9
Dependent Claim
44 words
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.
Claim 10
Dependent Claim
41 words
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.
Claim 11
Dependent Claim
34 words
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.
Claim 12
Dependent Claim
39 words
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 .
Claim 13
Dependent Claim
51 words
The image display panel of claim 2, 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 .
Claim 14
Dependent Claim
81 words
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.
Claim 15
Dependent Claim
27 words
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.
Claim 16
Dependent Claim
36 words
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.
Claim 17
Dependent Claim
63 words
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.
Claim 18
Dependent Claim
63 words
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.
Claim 19
Dependent Claim
16 words
The process of claim 16 which comprises forming further a non-glare film on the antistatic film.
Claim 20
Dependent Claim
86 words
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.
Claim 21
Dependent Claim
39 words
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 periodic table and the transparent conductive metal oxides are of tin, indium, and antimony.
Claim 22
Dependent Claim
30 words
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.
Claim 23
Dependent Claim
58 words
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 .
Claim 24
Dependent Claim
31 words
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 .
Claim 25
Dependent Claim
29 words
The process of claim 18 or 22, wherein R 1 of the Si(OR 1 ) 4 is ethyl and the alcohol component of the alcoholic solution is ethyl alcohol.
Claim 26
Dependent Claim
46 words
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 .
Claim 27
Dependent Claim
35 words
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.
Claim 28
Dependent Claim
110 words
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.
Claim 29
Dependent Claim
42 words
The process of claim 26, 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.
Claim 30
Dependent Claim
44 words
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.
Claim 31
Dependent Claim
35 words
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.
Claim 32
Dependent Claim
29 words
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.
Claim 33
Dependent Claim
47 words
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 .
Claim 34
Dependent Claim
35 words
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 is conducted at 50°-200° C.
Claim 35
Dependent Claim
103 words
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.
Claim 36
Dependent Claim
62 words
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.
Claim 37
Dependent Claim
26 words
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.
Claim 38
Dependent Claim
35 words
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.
References Cited (Backward Citations)
US2599739A
Cited
US4723091A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-07-30 | 1994-01-29 | 1994-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-30 | 1998-01-29 | 1998-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-30 | 2002-01-29 | 2002-07-31 | $7700.00 | Window Closed / Lapsed |