US3890609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low voltage cold cathode discharge type display devices with metal oxide cathode and phosphor anode matrix
Assignee: Oki Electric Industry Co Ltd
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Filing: 1973-04-05
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Granted: 1975-06-17
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Expires: 1993-04-05
Abstract
Abstract A plurality of anode electrodes coated with a phosphor and cathode electrodes coated with an electron emissive substance are disposed at right angles on both sides of an insulative spacer having a plurality of perforations which are arranged in a matrix between a pair of substrates, at least one of them being transparent. Each anode electrode is arranged to face one column of the matrix and each cathode electrode is arranged to face one row of the matrix. The peripheries of the pair of substrates are sealed to form an envelope and the envelope is filled with an inert gas. Switching means is provided for applying an operating voltage across selected anode and cathode electrodes thereby causing the phosphor to luminescence at the cross-point between the selected anode and cathode electrodes.
Inventors
- 👤 Rentaro Sasaki
- 👤 Akinori Watanabe
- 👤 Tatsuo Ogasawara
- 👤 Hidetoshi Sogabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:40
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/38; H01J17/48; H01J17/49
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
175 words
A cold cathode discharge type display device comprising a pair of insulative substrates, at least one of the substrates being transparent, an insulative spacer disposed between said pair of substrates, said spacer being provided with a plurality of perforations which are arranged in a matrix, a plurality of cold cathode electrodes disposed between one substrate and said insulative spacer with each cold cathode electrode opposed to one row of the matrix, an electron emissive metal oxide coated on respective cold cathode electrodes, a plurality of anode electrodes disposed between the other insulative substrate and said insulative spacer with each anode electrode opposed to one column of the matrix, means for hermetically sealing the peripheries of said pair of substrates thereby forming a sealed envelope, an inert gas sealed in said envelope, and means for applying an operating voltage acrosS a selected one of the anode electrodes and a selected one of the cathode electrodes so as to establish electric discharge at the cross-point between said selected anode and cathode electrodes thereby displaying a desired pattern.
Claim 2
Dependent Claim
175 words
A cold cathode discharge type display device comprising a pair of insulative substrates, at least one of the substrates being transparent, an insulative spacer disposed between said pair of substrates, said spacer being provided with a plurality of perforations which are arranged in a matrix, a plurality of cold cathode electrodes disposed between one substrate and said insulative spacer with each cold cathode electrode opposed to one row of the matrix, an electron emissive metal oxide coated on respective cold cathode electrodes, a plurality of anode electrodes disposed between the other insulative substrate and said insulative spacer with each anode electrode opposed to one column of the matrix, means for hermetically sealing the peripheries of said pair of substrates thereby forming a sealed envelope, an inert gas sealed in said envelope, and means for applying an operating voltage acrosS a selected one of the anode electrodes and a selected one of the cathode electrodes so as to establish electric discharge at the cross-point between said selected anode and cathode electrodes thereby displaying a desired pattern.
Claim 3
Dependent Claim
16 words
The display device according to claim 1 wherein a phosphor is coated on respective anode electrodes.
Claim 4
Dependent Claim
30 words
The display device according to claim 1 wherein a phosphor is applied on the inner surface of the transparent substrate at least the portions thereof facing to said anode electrodes.
Claim 5
Dependent Claim
19 words
The display device according to claim 1 wherein a phosphor is coated on the inner surfaces of said perforations.
Claim 6
Dependent Claim
70 words
The display device according to claim 1 wherein said means for applying said operating voltage comprises a first rotary switch having a plurality of stationary contacts connected to respective cathode electrodes, a second rotary switch having a plurality of stationary contacts connected to respective anode electrodes, and a source of supply and a transistor which are connected in series across the movable contacts of said first and second rotary switches.
References Cited (Backward Citations)
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US2933648A
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US2926286A
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US3559190A
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US3589789A
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US3686686A
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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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |