US3771008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gaseous discharge display device
Assignee: AT&T Inc
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Filing: 1972-11-09
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Granted: 1973-11-06
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Expires: 1992-11-09
Abstract
Abstract The specification describes a flat panel gaseous discharge display device in which the display illumination is formed at least in part by luminescence resulting from excitation of an appropriate phosphor by low energy electrons drawn from a glow discharge. To provide scan, the discharge is either itself moving in stepwise fashion between discrete cells or is a secondary discharge primed by a scanning discharge and triggered by the display information signal. Varying the current through the phosphor produces gray scale. Illumination from the gaseous discharge may be mixed with the phosphor for color balance and increased brightness. The phosphor can be divided into color stripes with means for selective energization of the stripes to form a color display.
Inventors
- 👤 Y Chen
- 👤 H Fukui
- 👤 E Gordon
- 👤 D Krupka
- 👤 J Rowen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:00
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/38; H01J17/48; H01J17/49; H01J17/492; H01J17/497
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
183 words
A gaseous discharge flat panel display device comprising: a gas-tight, panel-shaped gas-filled envelope having an insulating bottom plate and an insulating top plate, and disposed therebetween a first parallel grid of electrode elements; a second parallel grid of electrode elements extending orthogonal to said first grid; insulating spacing means between the first and second grids, said spacing means being apertured, leaving cavities extending between portions of said first and second grids with one aperture for each line of one of the parallel grids to form an array of discharge cells, each cell corresponding to the area of the vertical intersection of the electrode elements of the first and second array; insulating spacing means overlying said second grid, having apertures therethrough corresponding to each discharge cell and defining a multiplicity of display cavities, each communicating with a discharge cell through at least one opening; an array of display anodes disposed between the display cavities and the top plate and extending parallel to one of said first and second grids; the invention characterized in that the display anodes comprise conductive low voltage cathodolumInescent phosphor elements.
Claim 2
Dependent Claim
183 words
A gaseous discharge flat panel display device comprising: a gas-tight, panel-shaped gas-filled envelope having an insulating bottom plate and an insulating top plate, and disposed therebetween a first parallel grid of electrode elements; a second parallel grid of electrode elements extending orthogonal to said first grid; insulating spacing means between the first and second grids, said spacing means being apertured, leaving cavities extending between portions of said first and second grids with one aperture for each line of one of the parallel grids to form an array of discharge cells, each cell corresponding to the area of the vertical intersection of the electrode elements of the first and second array; insulating spacing means overlying said second grid, having apertures therethrough corresponding to each discharge cell and defining a multiplicity of display cavities, each communicating with a discharge cell through at least one opening; an array of display anodes disposed between the display cavities and the top plate and extending parallel to one of said first and second grids; the invention characterized in that the display anodes comprise conductive low voltage cathodolumInescent phosphor elements.
Claim 3
Dependent Claim
20 words
The device of claim 1 in which the conductive phosphor elements comprise conductive stripes coated with low voltage cathodoluminescent phosphor.
Claim 4
Dependent Claim
22 words
The device of claim 2 in which some conductive stripes are coated with one color phosphor and others with another color phosphor.
Claim 5
Dependent Claim
40 words
The device of claim 2 in which every third conductive stripe is connected to a common electrical lead, every third stripe is coated with one color phosphor and every group of interconnected stripes is coated with a different color phosphor.
Claim 6
Dependent Claim
23 words
The device of claim 2 in which the conductive stripes are indium-tin oxide and the low voltage cathodoluminescent phosphor is P 15 phosphor.
Claim 7
Dependent Claim
35 words
The display device of claim 1 having additionally an insulating blank covering one or more of the openings in the electrode grid elements to prevent illumination from the glow discharge from strking the top plate.
Claim 8
Dependent Claim
208 words
A gaseous discharge flat panel display device comprising: a gas-tight, panel-shaped gas-filled envelope having an insulating bottom plate and an insulating top plate, a cathode grid of parallel electrode elements supported by the bottom plate, an insulating slotted spacer overlying the cathode grid, with the slots extending orthogonal to the cathode grid electrode elements, a scan anode grid of parallel electrode elements overlying the insulating spacer with the electrode elements aligned with and substantially covering the slots in the spacer, the electrode elements further having openings through their thickness with at least one opening approximately vertically aligned with an electrode element of the cathode grid below, an apertured spacer overlying the scan anode grid having a row array of apertures each aligned with the vertical intersection of one of the cathode and scan anode electrode elements and communicating with the slotted portions of the insulating slotted spacer through at least one of the openings in the scan anode grid, and a display anode grid overlying the apertured spacer, the display anode grid having parallel display anode elements with each element aligned with a row of apertures in the apertured spacer and with a scan anode electrode element, the display anode elements further comprising a low voltage cathodoluminescent phosphor.
Claim 9
Dependent Claim
208 words
A gaseous discharge flat panel display device comprising: a gas-tight, panel-shaped gas-filled envelope having an insulating bottom plate and an insulating top plate, a cathode grid of parallel electrode elements supported by the bottom plate, an insulating slotted spacer overlying the cathode grid, with the slots extending orthogonal to the cathode grid electrode elements, a scan anode grid of parallel electrode elements overlying the insulating spacer with the electrode elements aligned with and substantially covering the slots in the spacer, the electrode elements further having openings through their thickness with at least one opening approximately vertically aligned with an electrode element of the cathode grid below, an apertured spacer overlying the scan anode grid having a row array of apertures each aligned with the vertical intersection of one of the cathode and scan anode electrode elements and communicating with the slotted portions of the insulating slotted spacer through at least one of the openings in the scan anode grid, and a display anode grid overlying the apertured spacer, the display anode grid having parallel display anode elements with each element aligned with a row of apertures in the apertured spacer and with a scan anode electrode element, the display anode elements further comprising a low voltage cathodoluminescent phosphor.
Claim 10
Dependent Claim
19 words
The display device of claim 7 in which the display anode elements are supported by the insulating top plate.
Claim 11
Dependent Claim
65 words
The display device of claim 7 in which the display anode grid elements are coated on the side facing the aperture array with an insulating material and further have at least one opening through the region of their thickness corresponding with each aperture to allow electrons drawn from the aperture to strike the side of the display anode elements that faces the insulating top plate.
Claim 12
Dependent Claim
191 words
A gaseous discharge flat panel display device comprising: a gas-tight, panel-shaped, gas-filled envelope having an insulating bottom plate and an insulating top plate, a scan anode grid of parallel electrode elements supported by the bottom plate, insulating spacing means extending between the elements of the scan anode grid, a cathode grid of parallel electrode elements overlying the spacing means with the electrode elements extending orthogonal to the elements of the scan anode grid, and having openings through their thickness with at least one opening approximately vertically aligned with an electrode element of the anode grid below, an apertured spacer overlying the cathode grid having a row array of apertures each aligned with the vertical intersection of one of the scan anode and cathode elements and communicating with the cathode grid electrode elements through at least one of the openings in the cathode grid, and a display anode grid overlying the apertured spacer, the display anode grid having parallel display anode elements with each element aligned with a row of apertures in the apertured spacer and with a scan anode electrode element, the display anodes further comprising a low voltage cathodoluminescent phosphor.
Claim 13
Dependent Claim
191 words
A gaseous discharge flat panel display device comprising: a gas-tight, panel-shaped, gas-filled envelope having an insulating bottom plate and an insulating top plate, a scan anode grid of parallel electrode elements supported by the bottom plate, insulating spacing means extending between the elements of the scan anode grid, a cathode grid of parallel electrode elements overlying the spacing means with the electrode elements extending orthogonal to the elements of the scan anode grid, and having openings through their thickness with at least one opening approximately vertically aligned with an electrode element of the anode grid below, an apertured spacer overlying the cathode grid having a row array of apertures each aligned with the vertical intersection of one of the scan anode and cathode elements and communicating with the cathode grid electrode elements through at least one of the openings in the cathode grid, and a display anode grid overlying the apertured spacer, the display anode grid having parallel display anode elements with each element aligned with a row of apertures in the apertured spacer and with a scan anode electrode element, the display anodes further comprising a low voltage cathodoluminescent phosphor.
Claim 14
Dependent Claim
21 words
The display device of claim 10 in which the low voltage cathodoluminescent phosphor is P15 phosphor and the gas comprises neon.
Claim 15
Dependent Claim
65 words
The display device of claim 10 in which the display anode grid elements are coated on the side facing the aperture array with an insulating material and further have at least one opening through the region of their thickness corresponding with each aperture to allow electrons drawn from the aperture to strike the side of the display anode elements that faces the insulating top plate.
Claim 16
Dependent Claim
12 words
The display device of claim 10 in which the gas comprises neon.
Claim 17
Dependent Claim
12 words
The display device of claim 10 in which the gas comprises xenon.
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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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |