US5777427A
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Electron emission cathode having a semiconductor film; a device including the cathode; and a method for making the cathode
Assignee: Panasonic Holdings Corp
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Filing: 1995-10-05
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Granted: 1998-07-07
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Expires: 2015-10-05
Abstract
Abstract An electron emission cathode includes: an n-type semiconductor film including diamond particles partially projecting from a surface of the n-type semiconductor film; and an anode opposing the n-type semiconductor film with a vacuum interposed therebetween. Electrons are emitted by applying a voltage between the anode and the n-type semiconductor film.
Inventors
- 👤 Hiroyoshi Tanaka
- 👤 Koichi Kotera
- 👤 Masao Uchida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:54
CPC Classifications
B; B82; B82Y; B82Y10/00; H; H01; H01J; H01J9/00; H01J9/02; H01J9/022; H01J9/025; H01J1/00; H01J1/02; H01J1/30; H01J1/304; H01J1/3042; H01J2201/00; H01J2201/30; H01J2201/304; H01J2201/30403; H01J2201/30446; H01J2201/30453; H01J2201/30457; H01J2329/00
Claims Analysis
Total Claims: 51
Claim 1
Independent Claim
38 words
An electron emission cathode comprising: an n-type semiconductor film including diamond particles partially projecting from a surface of the n-type semiconductor film, wherein electrons are emitted by applying a voltage between an anode and the n-type semiconductor film.
Claim 2
Dependent Claim
38 words
An electron emission cathode comprising: an n-type semiconductor film including diamond particles partially projecting from a surface of the n-type semiconductor film, wherein electrons are emitted by applying a voltage between an anode and the n-type semiconductor film.
Claim 3
Dependent Claim
18 words
An electron emission cathode according to claim 1, wherein the diamond particles are composed of a p-type semiconductor.
Claim 4
Dependent Claim
35 words
An electron emission cathode comprising: a carbon film including diamond particles partially projecting from a surface of the carbon film, wherein electrons are emitted by applying a voltage between an anode and the carbon film.
Claim 5
Dependent Claim
35 words
An electron emission cathode comprising: a carbon film including diamond particles partially projecting from a surface of the carbon film, wherein electrons are emitted by applying a voltage between an anode and the carbon film.
Claim 6
Dependent Claim
21 words
An electron emission cathode according to claim 3, wherein the carbon film is an n-type semiconductor or a pseudo n-type semiconductor.
Claim 7
Dependent Claim
31 words
An electron emission cathode according to claim 3, wherein the carbon film includes nitrogen as an n-type impurity, and a portion of the carbon film includes particles having a diamond structure.
Claim 8
Dependent Claim
22 words
An electron emission cathode according to claim 3, wherein said carbon film is on an outer surface of the electron emission cathode.
Claim 9
Dependent Claim
19 words
An electron emission cathode according to claim 3, wherein said carbon particles are partially embedded in the carbon film.
Claim 10
Dependent Claim
55 words
An electron emission cathode comprising: a conductive film, a first semiconductor film of a first conductivity type formed on the conductive film; and an island-like second semiconductor film of a second conductivity type formed on the first semiconductor film, wherein electrons are emitted by applying a voltage between an anode and the second semiconductor film.
Claim 11
Dependent Claim
55 words
An electron emission cathode comprising: a conductive film, a first semiconductor film of a first conductivity type formed on the conductive film; and an island-like second semiconductor film of a second conductivity type formed on the first semiconductor film, wherein electrons are emitted by applying a voltage between an anode and the second semiconductor film.
Claim 12
Dependent Claim
19 words
An electron emission cathode according to claim 8, wherein the first semiconductor film is formed in an island-like shape.
Claim 13
Dependent Claim
25 words
An electron emission cathode according to claim 8, wherein one of the first semiconductor film and the second semiconductor film includes diamond doped with boron.
Claim 14
Dependent Claim
49 words
An electron emission cathode according to claim 8, wherein one of the first semiconductor film and the second semiconductor film is composed of a thin carbon film containing nitrogen, the thin carbon film being produced by using one selected from the group consisting of pyridine, pyridazine, pyrimidine and 1,3,5-triazine.
Claim 15
Dependent Claim
76 words
An electron emission cathode comprising: a conductive film; a first semiconductor film of a first conductivity type formed on the conductive film; and a second semiconductor film of a second conductivity type formed on the first semiconductor film and having a plurality of openings provided therein, the plurality of openings at least exposing a surface of the first semiconductor film, wherein electrons are emitted by applying a voltage between an anode and the second semiconductor film.
Claim 16
Dependent Claim
76 words
An electron emission cathode comprising: a conductive film; a first semiconductor film of a first conductivity type formed on the conductive film; and a second semiconductor film of a second conductivity type formed on the first semiconductor film and having a plurality of openings provided therein, the plurality of openings at least exposing a surface of the first semiconductor film, wherein electrons are emitted by applying a voltage between an anode and the second semiconductor film.
Claim 17
Dependent Claim
29 words
An electron emission cathode according to claim 12, wherein the plurality of openings are also present in the first semiconductor film, thereby exposing a surface of the conductive film.
Claim 18
Dependent Claim
25 words
An electron emission cathode according to claim 12, wherein one of the first semiconductor film and the second semiconductor film includes diamond doped with boron.
Claim 19
Dependent Claim
49 words
An electron emission cathode according to claim 12, wherein one of the first semiconductor film and the second semiconductor film is composed of a thin carbon film containing nitrogen, the thin carbon film being produced by using one selected from the group consisting of pyridine, pyridazine, pyrimidine and 1,3,5-triazine.
Claim 20
Dependent Claim
57 words
An electron emission device comprising: a cathode composed essentially of an n-type semiconductor film including diamond particles partially projecting from a surface of the n-type semiconductor film; and an anode opposing the n-type semiconductor film with a vacuum interposed therebetween, wherein electrons are emitted from the cathode by applying a voltage between the anode and the cathode.
Claim 21
Dependent Claim
57 words
An electron emission device comprising: a cathode composed essentially of an n-type semiconductor film including diamond particles partially projecting from a surface of the n-type semiconductor film; and an anode opposing the n-type semiconductor film with a vacuum interposed therebetween, wherein electrons are emitted from the cathode by applying a voltage between the anode and the cathode.
Claim 22
Dependent Claim
51 words
An electron emission device according to claim 16 further comprising a gate electrode provided between the cathode and the anode, the gate electrode having an opening for exposing at least a portion of the cathode, wherein electrons are drawn out from the cathode by a voltage applied to the gate electrode.
Claim 23
Dependent Claim
47 words
An electron emission device according to claim 17, wherein the cathode and the gate electrode are formed in stripes extending along different directions so as to intersect each other, and the opening is provided in the opening in an intersection of the cathode and the gate electrode.
Claim 24
Dependent Claim
54 words
An electron emission device comprising: a cathode composed essentially of a carbon film including diamond particles partially projecting from a surface of the carbon film; and an anode opposing the carbon film with a vacuum interposed therebetween, wherein electrons are emitted from the cathode by applying a voltage between the anode and the cathode.
Claim 25
Dependent Claim
54 words
An electron emission device comprising: a cathode composed essentially of a carbon film including diamond particles partially projecting from a surface of the carbon film; and an anode opposing the carbon film with a vacuum interposed therebetween, wherein electrons are emitted from the cathode by applying a voltage between the anode and the cathode.
Claim 26
Dependent Claim
51 words
An electron emission device according to claim 19 further comprising a gate electrode provided between the cathode and the anode, the gate electrode having an opening for exposing at least a portion of the cathode, wherein electrons are drawn out from the cathode by a voltage applied to the gate electrode.
Claim 27
Dependent Claim
47 words
An electron emission device according to claim 20, wherein the cathode and the gate electrode are formed in stripes extending along different directions so as to intersect each other, and the opening is provided in the opening in an intersection of the cathode and the gate electrode.
Claim 28
Dependent Claim
72 words
An electron emission device comprising: a cathode including a conductive film, a first semiconductor film of a first conductivity type formed on the conductive film, and an island-like second semiconductor film of a second conductivity type formed on the first semiconductor film; and an anode opposing the first semiconductor film with a vacuum interposed therebetween, wherein electrons are emitted from the cathode by applying a voltage between the anode and the cathode.
Claim 29
Dependent Claim
72 words
An electron emission device comprising: a cathode including a conductive film, a first semiconductor film of a first conductivity type formed on the conductive film, and an island-like second semiconductor film of a second conductivity type formed on the first semiconductor film; and an anode opposing the first semiconductor film with a vacuum interposed therebetween, wherein electrons are emitted from the cathode by applying a voltage between the anode and the cathode.
Claim 30
Dependent Claim
51 words
An electron emission device according to claim 22 further comprising a gate electrode provided between the cathode and the anode, the gate electrode having an opening for exposing at least a portion of the cathode, wherein electrons are drawn out from the cathode by a voltage applied to the gate electrode.
Claim 31
Dependent Claim
47 words
An electron emission device according to claim 23, wherein the cathode and the gate electrode are formed in stripes extending along different directions so as to intersect each other, and the opening is provided in the opening in an intersection of the cathode and the gate electrode.
Claim 32
Dependent Claim
93 words
An electron emission device comprising: a cathode including a conductive film, a first semiconductor film of a first conductivity type formed on the conductive film; and a second semiconductor film of a second conductivity type formed on the first semiconductor film and having a plurality of openings provided therein, the plurality of openings at least exposing a surface of the first semiconductor film; and an anode opposing the first semiconductor film with a vacuum interposed therebetween, wherein electrons are emitted from the cathode by applying a voltage between the anode and the cathode.
Claim 33
Dependent Claim
93 words
An electron emission device comprising: a cathode including a conductive film, a first semiconductor film of a first conductivity type formed on the conductive film; and a second semiconductor film of a second conductivity type formed on the first semiconductor film and having a plurality of openings provided therein, the plurality of openings at least exposing a surface of the first semiconductor film; and an anode opposing the first semiconductor film with a vacuum interposed therebetween, wherein electrons are emitted from the cathode by applying a voltage between the anode and the cathode.
Claim 34
Dependent Claim
52 words
An electron emission device according to claim 25 further comprising a gate electrode provided between the cathode and the anode, the a gate electrode having an opening for exposing at least a portion of the cathode, wherein electrons are drawn out from the cathode by a voltage applied to the gate electrode.
Claim 35
Dependent Claim
47 words
An electron emission device according to claim 26, wherein the cathode and the gate electrode are formed in stripes extending along different directions so as to intersect each other, and the opening is provided in the opening in an intersection of the cathode and the gate electrode.
Claim 36
Dependent Claim
89 words
A flat display comprising: a support substrate; a cathode provided on the support substrate, the cathode being composed essentially of an n-type semiconductor film including diamond particles partially projecting from a surface of the n-type semiconductor film; a transparent substrate; and a fluorescent substance provided on a surface of the transparent electrode, wherein the support substrate and the transparent substrate are disposed in such a manner that the cathode and the fluorescent substance oppose each other, and a vacuum in an interspace between the support substrate and the transparent.
Claim 37
Dependent Claim
89 words
A flat display comprising: a support substrate; a cathode provided on the support substrate, the cathode being composed essentially of an n-type semiconductor film including diamond particles partially projecting from a surface of the n-type semiconductor film; a transparent substrate; and a fluorescent substance provided on a surface of the transparent electrode, wherein the support substrate and the transparent substrate are disposed in such a manner that the cathode and the fluorescent substance oppose each other, and a vacuum in an interspace between the support substrate and the transparent.
Claim 38
Dependent Claim
51 words
A flat display according to claim 28 further comprising a gate electrode provided between the cathode and the fluorescent substance, the gate electrode having an opening for exposing at least a portion of the cathode, wherein electrons are drawn out from the cathode by a voltage applied to the gate electrode.
Claim 39
Dependent Claim
43 words
A flat display according to claim 29, wherein the cathode and the gate electrode are formed in stripes extending along different directions so as to intersect each other, and the opening is provided in an intersection of the cathode and the gate electrode.
Claim 40
Dependent Claim
87 words
A flat display comprising: a support substrate; a cathode provided on the support substrate, the cathode being composed essentially of a carbon film including diamond particles partially projecting from a surface of the carbon film; a transparent substrate; and a fluorescent substance provided on a surface of the transparent electrode, wherein the support substrate and the transparent substrate are disposed in such a manner that the cathode and the fluorescent substance oppose each other, and a vacuum in an interspace between the support substrate and the transparent.
Claim 41
Dependent Claim
87 words
A flat display comprising: a support substrate; a cathode provided on the support substrate, the cathode being composed essentially of a carbon film including diamond particles partially projecting from a surface of the carbon film; a transparent substrate; and a fluorescent substance provided on a surface of the transparent electrode, wherein the support substrate and the transparent substrate are disposed in such a manner that the cathode and the fluorescent substance oppose each other, and a vacuum in an interspace between the support substrate and the transparent.
Claim 42
Dependent Claim
51 words
A flat display according to claim 31 further comprising a gate electrode provided between the cathode and the fluorescent substance, the gate electrode having an opening for exposing at least a portion of the cathode, wherein electrons are drawn out from the cathode by a voltage applied to the gate electrode.
Claim 43
Dependent Claim
43 words
A flat display according to claim 32, wherein the cathode and the gate electrode are formed in stripes extending along different directions so as to intersect each other, and the opening is provided in an intersection of the cathode and the gate electrode.
Claim 44
Dependent Claim
103 words
A flat display comprising: a support substrate; a cathode provided on the support substrate, the cathode including a conductive film, a first semiconductor film of a first conductivity type formed on the conductive film, and an island-like second semiconductor film of a second conductivity type formed on the first semiconductor film; a transparent substrate; and a fluorescent substance provided on a surface of the transparent electrode, wherein the support substrate and the transparent substrate are disposed in such a manner that the cathode and the fluorescent substance oppose each other, and a vacuum in an interspace between the support substrate and the transparent.
Claim 45
Dependent Claim
103 words
A flat display comprising: a support substrate; a cathode provided on the support substrate, the cathode including a conductive film, a first semiconductor film of a first conductivity type formed on the conductive film, and an island-like second semiconductor film of a second conductivity type formed on the first semiconductor film; a transparent substrate; and a fluorescent substance provided on a surface of the transparent electrode, wherein the support substrate and the transparent substrate are disposed in such a manner that the cathode and the fluorescent substance oppose each other, and a vacuum in an interspace between the support substrate and the transparent.
Claim 46
Dependent Claim
51 words
A flat display according to claim 34 further comprising a gate electrode provided between the cathode and the fluorescent substance, the gate electrode having an opening for exposing at least a portion of the cathode, wherein electrons are drawn out from the cathode by a voltage applied to the gate electrode.
Claim 47
Dependent Claim
43 words
A flat display according to claim 35, wherein the cathode and the gate electrode are formed in stripes extending along different directions so as to intersect each other, and the opening is provided in an intersection of the cathode and the gate electrode.
Claim 48
Dependent Claim
117 words
A flat display comprising: a support substrate; a cathode including a conductive film, a first semiconductor film of a first conductivity type formed on the conductive film; and a second semiconductor film of a second conductivity type formed on the first semiconductor film and having a plurality of openings provided therein, the plurality of openings at least exposing a surface of the first semiconductor film; a transparent substrate; and a fluorescent substance provided on a surface of the transparent electrode, wherein the support substrate and the transparent substrate are disposed in such a manner that the cathode and the fluorescent substance oppose each other, and a vacuum in an interspace between the support substrate and the transparent.
Claim 49
Dependent Claim
117 words
A flat display comprising: a support substrate; a cathode including a conductive film, a first semiconductor film of a first conductivity type formed on the conductive film; and a second semiconductor film of a second conductivity type formed on the first semiconductor film and having a plurality of openings provided therein, the plurality of openings at least exposing a surface of the first semiconductor film; a transparent substrate; and a fluorescent substance provided on a surface of the transparent electrode, wherein the support substrate and the transparent substrate are disposed in such a manner that the cathode and the fluorescent substance oppose each other, and a vacuum in an interspace between the support substrate and the transparent.
Claim 50
Dependent Claim
51 words
A flat display according to claim 37 further comprising a gate electrode provided between the cathode and the fluorescent substance, the gate electrode having an opening for exposing at least a portion of the cathode, wherein electrons are drawn out from the cathode by a voltage applied to the gate electrode.
Claim 51
Dependent Claim
43 words
A flat display according to claim 38, wherein the cathode and the gate electrode are formed in stripes extending along different directions so as to intersect each other, and the opening is provided in an intersection of the cathode and the gate electrode.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-07-06 | 2002-01-05 | 2002-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-07-06 | 2006-01-05 | 2006-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-07-06 | 2010-01-05 | 2010-07-07 | $7700.00 | Window Closed / Lapsed |