EP0405262A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Flat panel display device
Assignee: Panasonic Holdings Corp
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Filing: 1990-06-16
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Granted: —
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Expires: 2010-06-16
Abstract
Abstract An evacuated flat panel device comprises an envelope including a face plate (1), an anode (3) and a fluorecent layer (5). Deposited on the back plate (11) are cathode (9) and a plurality of struts (S) for passing a micro current between electrodes in order to prevent an unfavorable spark discharge from taking place between the electrodes (3) and (9).
Inventors
- 👤 Kinzo Nonomura
- 👤 Satoshi 15 Hiragaki-Cho Kitao
- 👤 Ryuichi Murai
- 👤 Jumpei Hashiguchi
- 👤 Kiyoshi Hamada
- 👤 Masayuki Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 23:20
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J29/00; H01J29/02; H01J29/028; H01J31/123; H01J31/125; H01J31/127; H01J5/00; H01J5/02; H01J5/03; H01J2329/00; H01J2329/86; H01J2329/8625; H01J2329/863; H01J2329/864; H01J2329/865
Claims Analysis
Total Claims: 43
Claim 1
Independent Claim
114 words
A flat panel display device comprising: a face plate made of transparent material; a back plate positioned parallel to said face plate; a wall member extending between said face plate and back plate around the perimeter thereof to define an airtight housing: an anode provided on an inner surface of said face plate; a fluorescent layer provided in association with said anode; a cathode provided in association with an inner surface of said back plate; and a plurality of struts made of electrically conductive material tightly held between said back plate and face plate, whereby an electric charge accumulated between said anode and cathode is discharged by a leakage current flowing through said struts.
Claim 2
Dependent Claim
114 words
A flat panel display device comprising: a face plate made of transparent material; a back plate positioned parallel to said face plate; a wall member extending between said face plate and back plate around the perimeter thereof to define an airtight housing: an anode provided on an inner surface of said face plate; a fluorescent layer provided in association with said anode; a cathode provided in association with an inner surface of said back plate; and a plurality of struts made of electrically conductive material tightly held between said back plate and face plate, whereby an electric charge accumulated between said anode and cathode is discharged by a leakage current flowing through said struts.
Claim 3
Dependent Claim
24 words
A flat panel display device as claimed in Claim 1, wherein each of said struts have a specific resistance of 10⁶ to 10¹⁰ Ω·cm.
Claim 4
Dependent Claim
37 words
A flat panel display device as claimed in Claim 1, wherein each of said struts is formed in a shape similar to thimble with a keen top so as to make a spot contact with said anode.
Claim 5
Dependent Claim
25 words
A flat panel display device as claimed in Claim 1, wherein said struts are formed by the process of screen printing on said back plate.
Claim 6
Dependent Claim
23 words
A flat panel display device as claimed in Claim 1, wherein said fluorescent layer has light emission stripes and non-emission stripes occurring alternatively.
Claim 7
Dependent Claim
21 words
A flat panel display device as claimed in Claim 5, wherein said struts are held in contact with said non-emission stripes.
Claim 8
Dependent Claim
28 words
A flat panel display device as claimed in Claim 1, wherein said strut is made of a glass selected from a group of PbO, Pd-Ag, RuO₂ and Pt.
Claim 9
Dependent Claim
23 words
A flat panel display device as claimed in Claim 1, wherein said strut has an outer surface covered with secondary electron emitting material.
Claim 10
Dependent Claim
18 words
A flat panel display device as claimed in Claim 8, wherein said secondary electron emitting material is glass.
Claim 11
Dependent Claim
129 words
A flat panel display device comprising: a face plate made of transparent material; a back plate positioned parallel to said face plate; a wall member extending between said face plate and back plate around the perimeter thereof to define an airtight housing: a beam control layer inserted between said face plate and back plate; an anode provided on an inner surface of said face plate; a fluorescent layer provided in association with said anode; a cathode provided in association with an inner surface of said back plate; and a plurality of struts made of electrically conductive material tightly held between said beam control layer and face plate, whereby an electric charge accumulated between said anode and beam control layer is discharged by a leakage current flowing through said struts.
Claim 12
Dependent Claim
129 words
A flat panel display device comprising: a face plate made of transparent material; a back plate positioned parallel to said face plate; a wall member extending between said face plate and back plate around the perimeter thereof to define an airtight housing: a beam control layer inserted between said face plate and back plate; an anode provided on an inner surface of said face plate; a fluorescent layer provided in association with said anode; a cathode provided in association with an inner surface of said back plate; and a plurality of struts made of electrically conductive material tightly held between said beam control layer and face plate, whereby an electric charge accumulated between said anode and beam control layer is discharged by a leakage current flowing through said struts.
Claim 13
Dependent Claim
75 words
A flat panel display device as claimed in Claim 10, wherein said struts includes first struts provided on said beam control layer extending parallel to each other in first direction and spaced a predetermined pitch, and second struts provided on said face plate extending parallel to each other in second direction, perpendicular to said first direction, and spaced a predetermined pitch, so that struts are held in contact crossingly with each other at their tips.
Claim 14
Dependent Claim
15 words
A flat panel display device as claimed in Claim 11, wherein said struts are separated.
Claim 15
Dependent Claim
31 words
A flat panel display device as claimed in Claim 11, further comprising a plurality of struts made of electrically conductive material tightly held between said back plate and beam control layer.
Claim 16
Dependent Claim
75 words
A flat panel display device as claimed in Claim 13, wherein said struts includes third struts provided on said back plate extending parallel to each other in first direction and spaced a predetermined pitch, and fourth struts provided on said beam control layer extending parallel to each other in second direction, perpendicular to said first direction, and spaced a predetermined pitch, so that struts are held in contact crossingly with each other at their tips.
Claim 17
Dependent Claim
15 words
A flat panel display device as claimed in Claim 14, wherein said struts are separated.
Claim 18
Dependent Claim
24 words
A flat panel display device as claimed in Claim 10, wherein each of said struts have a specific resistance of 10⁶ to 10¹⁰ Ω·cm.
Claim 19
Dependent Claim
37 words
A flat panel display device as claimed in Claim 10, wherein each of said struts is formed in a shape similar to thimble with a keen top so as to make a spot contact with said anode.
Claim 20
Dependent Claim
25 words
A flat panel display device as claimed in Claim 10, wherein said struts are formed by the process of screen printing on said face plate.
Claim 21
Dependent Claim
25 words
A flat panel display device as claimed in Claim 10, wherein said struts are formed by the process of screen printing on said back plate.
Claim 22
Dependent Claim
23 words
A flat panel display device as claimed in Claim 10, wherein said fluorescent layer has light emission stripes and non-emission stripes occurring alternatively.
Claim 23
Dependent Claim
21 words
A flat panel display device as claimed in Claim 20, wherein said struts are held in contact with said non-emission stripes.
Claim 24
Dependent Claim
28 words
A flat panel display device as claimed in Claim 10, wherein said strut is made of a glass selected from a group of PbO, Pd-Ag, RuO2 and Pt.
Claim 25
Dependent Claim
23 words
A flat panel display device as claimed in Claim 10, wherein said strut has an outer surface covered with secondary electron emitting material.
Claim 26
Dependent Claim
18 words
A flat panel display device as claimed in Claim 23, wherein said secondary electron emitting material is glass.
Claim 27
Dependent Claim
134 words
A flat panel display device comprising: a face plate made of transparent material; a back plate positioned parallel to said face plate; a wall member extending between said face plate and back plate around the perimeter thereof to define an airtight housing; first and second beam control layers placed one over the other and inserted between said face plate and back plate; an anode provided on an inner surface of said face plate; a fluorescent layer provided in association with said anode; a cathode provided in association with said back plate; and a plurality of struts made of electrically conductive material tightly held between said first and second beam control layers, whereby an electric charge accumulated between said first and second beam control layers is discharged by a leakage current flowing through said struts.
Claim 28
Dependent Claim
134 words
A flat panel display device comprising: a face plate made of transparent material; a back plate positioned parallel to said face plate; a wall member extending between said face plate and back plate around the perimeter thereof to define an airtight housing; first and second beam control layers placed one over the other and inserted between said face plate and back plate; an anode provided on an inner surface of said face plate; a fluorescent layer provided in association with said anode; a cathode provided in association with said back plate; and a plurality of struts made of electrically conductive material tightly held between said first and second beam control layers, whereby an electric charge accumulated between said first and second beam control layers is discharged by a leakage current flowing through said struts.
Claim 29
Dependent Claim
78 words
A flat panel display device as claimed in Claim 25, wherein said struts includes fifth struts provided on said first beam control layer extending parallel to each other in first direction and spaced a predetermined pitch, and sixth struts provided on said second beam control layer extending parallel to each other in second direction, perpendicular to said first direction, and spaced a predetermined pitch, so that struts are held in contact crossingly with each other at their tips.
Claim 30
Dependent Claim
15 words
A flat panel display device as claimed in Claim 26, wherein said struts are separated.
Claim 31
Dependent Claim
23 words
A flat panel display device as claimed in Claim 25, wherein each of said struts have a resistance of 10⁶ to 10¹⁰ ohm.
Claim 32
Dependent Claim
37 words
A flat panel display device as claimed in Claim 25, wherein each of said struts is formed in a shape similar to thimble with a keen top so as to make a spot contact with said anode.
Claim 33
Dependent Claim
33 words
A flat panel display device as claimed in Claim 25, wherein said struts are formed by the process of screen printing at least on one of said first and second been control layers.
Claim 34
Dependent Claim
23 words
A flat panel display device as claimed in Claim 25, wherein said fluorescent layer has light emission stripes and non-emission stripes occurring alternatively.
Claim 35
Dependent Claim
21 words
A flat panel display device as claimed in Claim 31, wherein said struts are held in contact with said non-emission stripes.
Claim 36
Dependent Claim
28 words
A flat panel display device as claimed in Claim 25, wherein said strut is made of a glass selected from a group of PbO, Pd-Ag, RuO₂ and Pt.
Claim 37
Dependent Claim
23 words
A flat panel display device as claimed in Claim 25, wherein said strut has an outer surface covered with secondary electron emitting material.
Claim 38
Dependent Claim
18 words
A flat panel display device as claimed in Claim 34, wherein said secondary electron emitting material is glass.
Claim 39
Dependent Claim
32 words
A flat panel display device as claimed in Claim 25, wherein at least one of said first and second beam control layer is forme by a plate having a plurality of slits.
Claim 40
Dependent Claim
28 words
A flat panel display device as claimed in Claim 25, wherein at least one of said first and second beam control layer is forme by a meshed plate.
Claim 41
Dependent Claim
178 words
A flat panel display device comprising: a face plate made of transparent material; a back plate positioned parallel to said face plate; a wall member extending between said face plate and back plate around the perimeter thereof to define an airtight housing: a conductive plate made of electrically conductive material and inserted between said face plate and back plate; an anode provided on an inner surface of said face plate; a fluorescent layer provided in association with said anode; a cathode provided in association with an inner surface of said back plate; a plurality of first semi-cylindrical beads made of electrically non-conductive material and mounted on one surface of said conductive plate and held tightly in contact with said back plate; and a plurality of second semi-cylindrical beads made of electrically non-conductive material and mounted on another surface of said conductive plate and held tightly in contact with said face plate, whereby an electric charge accumulated between said anode and cathode is discharged along an outer surface of said first and second semi-cylindrical beads through said conductive plate.
Claim 42
Dependent Claim
178 words
A flat panel display device comprising: a face plate made of transparent material; a back plate positioned parallel to said face plate; a wall member extending between said face plate and back plate around the perimeter thereof to define an airtight housing: a conductive plate made of electrically conductive material and inserted between said face plate and back plate; an anode provided on an inner surface of said face plate; a fluorescent layer provided in association with said anode; a cathode provided in association with an inner surface of said back plate; a plurality of first semi-cylindrical beads made of electrically non-conductive material and mounted on one surface of said conductive plate and held tightly in contact with said back plate; and a plurality of second semi-cylindrical beads made of electrically non-conductive material and mounted on another surface of said conductive plate and held tightly in contact with said face plate, whereby an electric charge accumulated between said anode and cathode is discharged along an outer surface of said first and second semi-cylindrical beads through said conductive plate.
Claim 43
Dependent Claim
67 words
A flat panel display device as claimed in Claim 38, further comprising: a plurality of third semi-cylindrical beads made of electrically non-conductive material and mounted on said back plate and held tightly in contact with said first semi-cylindrical beads; and a plurality of third semi-cylindrical beads made of electrically non-conductive material and mounted on said face plate and held tightly in contact with said second semi-cylindrical beads.
References Cited (Backward Citations)
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