Claims
- 1. A sustainer for an AC plasma panel, said sustainer comprising:
- a pull-up switch connected to a first voltage potential;
- a pull-down switch connected to a second voltage potential, said second voltage potential lower than said first voltage potential;
- an output for said sustainer, said output coupled to said pull-up switch and driven to said first voltage potential when said pull-up switch is conductive, said output additionally coupled to said pull-down switch and driven to said second voltage potential when said pull-down switch is conductive;
- driving means for selectively, alternatively closing said pull-up and pull-down switches;
- connecting means for connecting said driving means to said pull-up and pull-down switches to prevent both of said switches from being closed simultaneously; and
- first control means reduce the rate at which is potential of said sustainer output changes from said first potential to said second potential to a rate effective to eliminate excessive displacement currents;
- wherein said pull-up and pull-down switches are MOSFET transistors.
- 2. A sustainer for an AC plasma panel, said sustainer comprising:
- a pull-up switch comprising a MOSFET transistor connected to a first voltage potential;
- a pull-down switch comprising a MOSFET transistor connected to a second voltage potential, said second voltage potential lower than said first voltage potential;
- an output for said sustainer, said output coupled to said pull-up switch and driven to said first voltage potential when said pull-up switch is conductive, said output additionally coupled to said pull-down switch and driven to said second voltage potential when said pull-down switch is conductive;
- driving means for selectively, alternatively closing said pull-up and pull-down switches;
- connecting means for connecting said driving means to said pull-up and pull-down switches to prevent both of said switches from being closed simultaneously;
- first control means to control the rate at which the potential of said sustainer output changes from said first potential to said second potential; and
- means coupled to said pull-up and pull-down switches for preventing high frequency oscillations in said pull-up and pull-down MOSFET transistors when they are alternatively closed.
- 3. A sustainer for an AC plasma panel as defined in claim 2, wherein said preventing means comprises a resistor in series with the gate of one of said MOSFET transistors.
- 4. A sustainer for an AC plasma panel as defined in claim 3, wherein said resistor is in series with the gate of said pull-up transistor, said preventing means additionally comprising:
- 5. A sustainer for an AC plasma panel as defined in claim 1, additionally comprising a second control means to reduce the rate at which the potential of said sustainer output changes from said second potential to said first potential to a rate effective to eliminate excessive displacement currents.
- 6. A sustainer for an AC plasma panel as defined in claim 5, wherein said first and second rate control means cause said sustainer output potential to change linearly.
- 7. A sustainer for an AC plasma panel as defined in claim 1, wherein said driving means opens said pull-up switch whenever said pull-down switch begins to close, and closes said pull-up switch only when said pull-down switch is open.
- 8. A sustainer for an AC plasma panel, said sustainer comprising:
- a pull-up MOSFET transistor connected to a high voltage potential;
- a pull-down MOSFET transistor connected to a ground potential;
- an output for said sustainer alternatively driven by said pull-up transistor and said pull-down transistor;
- means coupled to said pull-up and pull-down transistors for selectively driving said pull-up and pull-down transistors, said means preventing said pull-up transistor from conducting when said pull-down transistor is conducting; and
- means coupled to said pull-up and pull-down transistors for preventing high frequency oscillations in said pull-up and pull-down transistors.
- 9. A sustainer for an AC plasma panel as defined in claim 8, further comprising:
- means for controlling the rate at which said sustainer output may be driven by said pull-up transistor and said pull-down transistor.
- 10. An AC plasma panel, comprising:
- a plasma panel having a gas sealed between two parallel plates;
- a plurality of electrodes deposited on said plates, the electrodes on one plate intersecting the electrodes on the other plate to define a plurality of cells of gas;
- means for generating a sustainer signal to maintain discharges in said panel between said electrodes once said discharge has been initiated, said sustainer signal alternating between two potentials, wherein one of said potentials is higher than the other of said potentials, and wherein said means for generating said sustainer signal comprises a pair of MOSFET transistors; and
- means for controlling the rate at which said sustainer signal slews between said two potentials to a rate which is effective to eliminate excessive displacement currents.
- 11. An AC plasma panel as defined in claim 10 wherein said rate control means causes said sustainer signal to slew linearly.
- 12. An AC plasma panel, comprising:
- a plasma panel having a gas sealed between two parallel plates;
- a plurality of electrodes deposited on said plates, the electrodes on one plate intersecting the electrodes on the other plate to define a plurality of cells of gas;
- means for generating a sustainer signal to maintain discharges in said panel between said electrodes once said discharge has been initiated, said sustainer signal alternating between two potentials, said generating means including output MOSFET transistors; and
- means for preventing high frequency oscillations in said output MOSFET transistors of said generating means.
- 13. A method of sustaining a light-emitting state in an AC plasma panel having a gas sealed between two parallel plates, comprising:
- generating an alternating potential using a pair of output MOSFET transistors;
- controlling the rate at which said potential changes from one potential level to the other to maintain the rate at an amount effective to eliminate excessive displacement currents;
- impressing said alternating potential on a plurality of electrodes deposited on said plates; and
- preventing high-frequency oscillations during said generating step.
- 14. A sustainer for an AC plasma panel, said sustainer comprising:
- a pull-up switch connected to a first voltage potential;
- a pull-down switch connected to a second voltage potential;
- an output for said sustainer, said output coupled to said pull-up switch and driven to said first voltage potential when said pull-up switch is conductive, said output additionally coupled to said pull-down switch and driven to said second voltage potential when said pull-down switch is conductive;
- driving means for selectively, alternatively closing said pull-up and pull-down switches;
- means coupled to said pull-up and pull-down switches for preventing high frequency oscillations in said pull-up and pull-down transistors when said transistors are alternatively closed; and
- wherein said pull-up and pull-down switches are MOSFET transistors.
- 15. A sustainer for an AC plasma panel as defined in claim 14, wherein said preventing means comprises a resistor in series with the gate of said pull-up switch.
- 16. A sustainer for an AC plasma panel as defined in claim 15, wherein said preventing means additionally comprises a bypass diode connected in parallel with said resistor, said bypass diode shunting said resistor when said pull-down transistor is closed to enable said pull-up transistor to be opened by said driving means.
- 17. A sustainer for an AC plasma panel as defined in claim 15, wherein said preventing means additionally comprises a resistor connected in series between said output and the gate of said pull-down transistor.
Parent Case Info
This application is a continuation of application Ser. No. 549,212, filed 11/4/83, which in turn was a continuation of Ser. No. 258,757, filed 4/29/81, both now abandoned.
US Referenced Citations (6)
Continuations (2)
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Number |
Date |
Country |
Parent |
549212 |
Nov 1983 |
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Parent |
258757 |
Apr 1981 |
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