US3825922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Channel plate display device having positive optical feedback
Assignee: US Philips Corp
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Filing: 1973-01-22
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Granted: 1974-07-23
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Expires: 1993-01-22
Abstract
Abstract Display device comprising a cathode-luminescent layer, a plurality of electron multiplier elements, and a plurality of individually energisable cathodes. The cathodes are photocathodes and an optical feedback path is provided between said luminescent layer and said photo-cathodes through said electron multiplier elements.
Inventors
- 👤 J Ralph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:52
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/50; H01J31/506; H01J31/507; H01J31/10; H01J31/12; H01J31/123; H01J31/125; H01J31/127; H01J2201/00; H01J2201/34; H01J2201/342
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
70 words
A display device comprising a plurality of selectively energisable display elements each comprising a channel electron multiplier element, an individual photo-cathode adjacent the input of said element, and cathodo-luminescent material situated in a path for electrons from the output of said element, said photo-cathode being sensitive to radiation emitted by said cathodo-luminescent material in response to electron bombardment and being situated in a path for said radiation from said material.
Claim 2
Dependent Claim
70 words
A display device comprising a plurality of selectively energisable display elements each comprising a channel electron multiplier element, an individual photo-cathode adjacent the input of said element, and cathodo-luminescent material situated in a path for electrons from the output of said element, said photo-cathode being sensitive to radiation emitted by said cathodo-luminescent material in response to electron bombardment and being situated in a path for said radiation from said material.
Claim 3
Dependent Claim
26 words
A device as claimed in claim 1, wherein said multiplier elements form a channel electron multiplier plate having its channels substantially perpendicular to its major surfaces.
Claim 4
Dependent Claim
137 words
A display device, comprising: a layer of cathodo-luminescent material which emits electromagnetic radiation in response to electron bombardment; a channel plate electron multiplier positioned adjacent one side of said layer to selectively bombard said layer with electrons from the output face thereof and to receive at the output face thereof electromagnetic radiation from said layer, the channels of said channel plate being sufficiently straight to pass therethrough from the output face to the input face thereof at least some of said received electromagnetic radiation, and an array of selectively energizable photo-cathodes positioned adjacent the input face of said channel plate to selectively supply electrons to said channel plate and to receive electromagnetic radiation passing back through said channel plate from said layer, said photo-cathodes emitting electrons in response to said received electromagnetic radiation, thereby providing positive feedback.
Claim 5
Dependent Claim
137 words
A display device, comprising: a layer of cathodo-luminescent material which emits electromagnetic radiation in response to electron bombardment; a channel plate electron multiplier positioned adjacent one side of said layer to selectively bombard said layer with electrons from the output face thereof and to receive at the output face thereof electromagnetic radiation from said layer, the channels of said channel plate being sufficiently straight to pass therethrough from the output face to the input face thereof at least some of said received electromagnetic radiation, and an array of selectively energizable photo-cathodes positioned adjacent the input face of said channel plate to selectively supply electrons to said channel plate and to receive electromagnetic radiation passing back through said channel plate from said layer, said photo-cathodes emitting electrons in response to said received electromagnetic radiation, thereby providing positive feedback.
Claim 6
Dependent Claim
67 words
The display device defined in claim 3 wherein said photo-cathodes are selectively energized by individually controlling the voltage potentials between said photo-cathodes and the input face of said channel plate, an individual photo-cathode being selectively energized by lowering the voltage potential thereof relative to the input face of said channel plate and de-energized by raising said voltage potential relative to the input face of said channel plate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |