Patent US2767725A successfully refreshed from Google Patents.
US3553458A
Expired / Lapsed
US
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Electrical negative-glow discharge display devices
Assignee: US Philips Corp
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Filing: 1968-01-19
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Granted: 1971-01-05
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Expires: 1988-01-19
Abstract
Abstract An electrical display device employing a two-dimensional array of glow discharge cells formed by an insulating plate having a plurality of apertures therein defining a plurality of hollow cathodes. Each of these hollow cathodes is formed by a cathode pin on which a layer of emissive material is provided in each of the apertures spaced from one surface of the plate. The walls of each aperture are also covered with material sputtered thereon and thus forming a cathode recess, or hollow cathode in the plate. An anode common to all the cathodes and spaced from the edge of each recess to prevent cathode-anode tracking of sputtered cathode material is provided. The cathode recesses are viewable through this anode which may be in the form of a grid or transparent plate spaced from the cathode recesses. Each of the cathodes is connected to a common negative electrode through an element of photoconductive material and allows passage of input radiation to each of those elements to provide controlled feedback to each of the cells.
Inventors
- 👤 Pieter Schagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:43
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/38; H01J17/48; H01J17/49
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
174 words
An electrical display panel device comprising a twodimensional array of glow-discharge cells, said array further comprising an insulating base plate having a plurality of apertures therein, a conductive pin having an emissive surface within each of said apertures, the emissive surface of said pin being spaced from one surface of said plate and defining therewith a recess in the plate the walls of which are covered with said emissive material and constituting a cathode cell of said array, a common anode for all the cells of the array spaced from the edges of each of the cells and through which the cells can be viewed, an inert gas filling said recesses at a pressure at which with a given potential between the anode and at least one of the cathodes there is a negative glow dischargE which fills the recess and a common negative supply electrode for all the cells which electrode is connected to each cathode through an element of photoconductive material and allows passage of input radiation to each of said elements.
Claim 2
Dependent Claim
174 words
An electrical display panel device comprising a twodimensional array of glow-discharge cells, said array further comprising an insulating base plate having a plurality of apertures therein, a conductive pin having an emissive surface within each of said apertures, the emissive surface of said pin being spaced from one surface of said plate and defining therewith a recess in the plate the walls of which are covered with said emissive material and constituting a cathode cell of said array, a common anode for all the cells of the array spaced from the edges of each of the cells and through which the cells can be viewed, an inert gas filling said recesses at a pressure at which with a given potential between the anode and at least one of the cathodes there is a negative glow dischargE which fills the recess and a common negative supply electrode for all the cells which electrode is connected to each cathode through an element of photoconductive material and allows passage of input radiation to each of said elements.
Claim 3
Dependent Claim
27 words
A display device as claimed in claim 1 in which the negative electrode is a single continuous photoconductive layer arranged to be common to all the cells.
Claim 4
Dependent Claim
21 words
A display device as claimed in claim 1 in which the negative electrode comprises a separate photoconductive element for each cell.
Claim 5
Dependent Claim
31 words
A display device as claimed in claim 1 in which the negative electrode is positioned so that the photoconductive action is mainly in the direction of thickness of the display device.
Claim 6
Dependent Claim
35 words
A display device as claimed in claim 3 in which the elements are positioned so that the photoconductive action of each element is mainly in directions substantially parallel to the image of the display device.
Claim 7
Dependent Claim
29 words
A display device as claimed in claim 1 wherein the gas filling is contained between an output window plate and the plate in which the cathode recesses are formed.
Claim 8
Dependent Claim
17 words
A display device as claimed in claim 6 wherein the plate between the cathode recesses is opaque.
Claim 9
Dependent Claim
17 words
A display device as claimed in claim 6 wherein the plate between the cathode recesses is translucent.
Claim 10
Dependent Claim
19 words
A display device as claimed in claim 1 including an electrical resistance in series with each of the cells.
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |