Patent US3665400A successfully refreshed from Google Patents.
US3665400A
Expired / Lapsed
US
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Switching circuits and method for diode elements in conductor selection matrices
Assignee: OI Glass Inc
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Filing: 1971-04-19
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Granted: 1972-05-23
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Expires: 1991-04-19
Abstract
Abstract A gas discharge display and memory panel having parallel row and parallel column conductor arrays wherein the conductors in the arrays are connected to selection and addressing resistor-diode matrix circuitry having non-inductive switch means for rendering nodal points in said matrix effective to change a discharge condition at selected sites of the panel. One embodiment discloses use of an SCR as the switch and another embodiment discloses a transistor switch. The circuits are reversible to accomodate negative and positive type pulses.
Inventors
- 👤 Donald D Leuck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:14
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/22; G09G3/28; G09G3/288; G09G3/296; G09G3/297; H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/62; H03K17/6221; H03K17/72; H03K17/735; H04; H04N; H04N3/00; H04N3/10; H04N3/12; H04N3/125
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
186 words
In a system for supplying operating potentials to a load device having row and column conductor arrays, including a first selection matrix for selecting the row conductors and a second selection matrix for selecting the column conductor each said selection matrix including a plurality of multiplexing elements, each multiplexing element having a common nodal point connected to a conductor in one of said arrays and at least three electrical paths to said nodal point, there being a resistive impedance element in one of said paths, and means for applying a pulse potential between the end of said impedance element rEmote from said nodal point and a common point, undirectional conducting device in each of the other paths of said multiplexing element, one of said undirectional conducting devices being connected directly between said nodal point and said common point, the improvement comprising a non-inductive switching device between the end of said other unidirectional conducting device and said common point, and circuit means for applying a switching signal to said non-inductive switching device to cause same to exhibit a high impedance during the time of said switching signal.
Claim 2
Dependent Claim
186 words
In a system for supplying operating potentials to a load device having row and column conductor arrays, including a first selection matrix for selecting the row conductors and a second selection matrix for selecting the column conductor each said selection matrix including a plurality of multiplexing elements, each multiplexing element having a common nodal point connected to a conductor in one of said arrays and at least three electrical paths to said nodal point, there being a resistive impedance element in one of said paths, and means for applying a pulse potential between the end of said impedance element rEmote from said nodal point and a common point, undirectional conducting device in each of the other paths of said multiplexing element, one of said undirectional conducting devices being connected directly between said nodal point and said common point, the improvement comprising a non-inductive switching device between the end of said other unidirectional conducting device and said common point, and circuit means for applying a switching signal to said non-inductive switching device to cause same to exhibit a high impedance during the time of said switching signal.
Claim 3
Dependent Claim
31 words
The invention defined in claim 1 including means connected to said non-inductive switching device for sensing change in the potential at said nodal point for rendering said non-inductive switching device conductive.
Claim 4
Dependent Claim
53 words
The invention defined in claim 2 wherein said non-inductive switching device is an SCR and the means for sensing change in potential at said nodal point includes voltage divider network connected in parallel with said SCR with the intermediate point of said voltage divider being connected to the gate electrode of said SCR.
Claim 5
Dependent Claim
19 words
The invention defined in claim 3 including a capacitor connected between the anode and gate electrode of said SCR.
Claim 6
Dependent Claim
31 words
The invention defined in claim 4 wherein said circuit means for applying a switching signal includes a transformer, and diode means coupling the secondary of said transformer to said gate electrode.
Claim 7
Dependent Claim
83 words
The invention defined in claim 1 wherein said non-inductive switching device includes a transistor, biasing means for normally biasing said transistor to a low impedance, conductive state so that the potential applied to said impedance element does not appear at said nodal point, and said circuit means for applying a switching signal overcomes said biasing means to cause said transistor to be non-conductive and exhibit a high impedance so that the pulse potential applied to said impedance element appears at said nodal point.
Claim 8
Dependent Claim
64 words
The invention defined in claim 1 wherein said row and column conductors are constituted by dielectrically coated conductor arrays, respectively, on a gas discharge panel, and said system including a source of periodic sustainer potential for at least one of the conductor arrays on said panel, and wherein said common point is constituted by an output terminal on said source of periodic sustainer potential.
Claim 9
Dependent Claim
45 words
The invention defined in claim 1 wherein the operating potentials supplied to said now conductors is of opposite, relative polarity from the potential supplied to said column conductors, and the further improvement wherein said non-inductive switching devices are constituted by semiconductors of the same type.
Claim 10
Dependent Claim
14 words
The invention defined in claim 1 wherein said non-inductive switches are NPN type transistors.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |