US4780644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas discharge display panel
Assignee: Japan Broadcasting Corp
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Filing: 1987-06-03
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Granted: 1988-10-25
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Expires: 2007-06-03
Abstract
Abstract A gas-discharge memory-type display panel having distinctively high radiation efficiency is realized by plural negative glow type discharge cells operating with a discharge electrode distance normalized filled gas pressure product (d·p o ) being in the range of 0.5 to 8.0 Torr·cm, at an average discharge current of less than 50 μA. Improved radiation efficiency can be further raised by direct viewing of radiation from fluorescent layers arranged flat on a rear plate of a simplified two-plate structure of a sealed envelope which can be readily manufactured.
Inventors
- 👤 Tetsuo Sakai
- 👤 Hiroshi Murakami
- 👤 Seiji Sega
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:58
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/38; H01J17/48; H01J17/49
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
165 words
A memory-type negative glow gas-discharge display panel comprising: a sealed envelope having at least two plates including a substantially transparent front plate and a rear plate, inner surfaces of which include display anodes and dislay cathodes disposed respectively together with a fluorescent layer, to form at least one discharge cell, a filled gas for emitting an ultraviolet ray wherein a product (d·p o ) of a distance (d) between each said display anode and said display cathode and normalized pressure (p o ) of said filled gas is in a range between 0.5 and 8.0 Torr·cm, wherein an area of said display cathodes does not exceed 15% of a total area of inner walls of said at least one discharge cell, and wherein an average discharge current of said at least one discharge cell during an continuous interval of 50 μsec does not exceed 50 μA ; whereby a highly efficient, stabalized negative glow discharge current is generated in said at least one discharge cell.
Claim 2
Dependent Claim
165 words
A memory-type negative glow gas-discharge display panel comprising: a sealed envelope having at least two plates including a substantially transparent front plate and a rear plate, inner surfaces of which include display anodes and dislay cathodes disposed respectively together with a fluorescent layer, to form at least one discharge cell, a filled gas for emitting an ultraviolet ray wherein a product (d·p o ) of a distance (d) between each said display anode and said display cathode and normalized pressure (p o ) of said filled gas is in a range between 0.5 and 8.0 Torr·cm, wherein an area of said display cathodes does not exceed 15% of a total area of inner walls of said at least one discharge cell, and wherein an average discharge current of said at least one discharge cell during an continuous interval of 50 μsec does not exceed 50 μA ; whereby a highly efficient, stabalized negative glow discharge current is generated in said at least one discharge cell.
Claim 3
Dependent Claim
33 words
A memory-type negative glow gas-discharge display panel as claimed in claim 1 further comprising: resistive elements individually inserted between said display cathodes and buses connected thereto so as to effect resistor memory-type operation.
Claim 4
Dependent Claim
66 words
A memory-type negative glow gas-discharge display panel as claimed in claim 1 further comprising: scanning anodes for scanning said at least one discharge cell arranged on the inner surface of said rear plate, wherein said display cathodes are arranged on the inner surface of said front plate and said display anodes are arranged together with said scanning anodes on the inner surface of the rear plate.
Claim 5
Dependent Claim
63 words
A memory-type negative glow gas-discharge display panel as claimed in claim 3 further comprising a first plurality of buses connected to said display anodes, and a second plurality of buses connected to said display cathodes, said first and second plurality of buses being criss-crossed, each of said display cathodes being disposed in the vicinity of a central axis of a respective discharge cell.
Claim 6
Dependent Claim
58 words
A memory-type negative glow gas-discharge display panel as claimed in claim 4 wherein said display anodes and said display cathodes are disposed apart from each other in respective discharge cells to generate and sustain said highly efficient, stabalized negative glow discharge, fluorescent layers being disposed around each said display anode on the inner surface of said rear plate.
Claim 7
Dependent Claim
36 words
A memory-type negative glow gas-discharge display panel as claimed in claim 1 further comprising: resistive elements individually connected to said display anodes, and buses connected to said resistive elements so as to effect resistor memory-type operation.
Claim 8
Dependent Claim
67 words
A memory-type negative glow gas-discharge display panel as claimed in claim 1 further comprising: first plurality of resistive elements respectively connected to said display cathodes, a first plurality of buses connected to said first resistive elements, a second plurality of resistive elements respectively connected to said display anodes and a second plurality of buses connected to said ssecond resistive elements so as to effect resistor memory-type operation.
References Cited (Backward Citations)
US3739218A
Cited
US3743879A
Cited
JPS5365657A
Cited
US4206386A
Cited
JPS54158859A
Cited
JPS5566832A
Cited
US4392075A
Cited
US4516053A
Cited
US4566006A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |