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Gas Panel Selection Circuit With Field Effect Transistors

IP.com Disclosure Number: IPCOM000084068D
Original Publication Date: 1975-Sep-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Larsen, TA: AUTHOR [+2]

Abstract

A gas display panel 2 has representative vertical wires 3 and 4 and horizontal wires 5 and 6 that form light-emitting cells at their crossover points. A horizontal selection circuit 7 and a vertical selection circuit 8 apply selected voltages to the wires for write, erase, and sustain operations. Vertical selection circuit 8 has an upper bus 9 and a lower bus 10. Bipolar transistors 11 and 12 are switched alternately to produce sustain voltage pulses on these buses. A transformer 13 has its secondary winding connected between the buses 9, 10 and its primary winding is energized by a source 14, to superimpose a write or erase pulse on the sustain waveform of upper bus 9. These components of the gas panel are conventional.

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Gas Panel Selection Circuit With Field Effect Transistors

A gas display panel 2 has representative vertical wires 3 and 4 and horizontal wires 5 and 6 that form light-emitting cells at their crossover points. A horizontal selection circuit 7 and a vertical selection circuit 8 apply selected voltages to the wires for write, erase, and sustain operations. Vertical selection circuit 8 has an upper bus 9 and a lower bus 10. Bipolar transistors 11 and 12 are switched alternately to produce sustain voltage pulses on these buses. A transformer 13 has its secondary winding connected between the buses 9, 10 and its primary winding is energized by a source 14, to superimpose a write or erase pulse on the sustain waveform of upper bus 9. These components of the gas panel are conventional.

Representative vertical wire 3 is controlled by a pair of field-effect transistors 15 and 16. When field-effect transistor 15 is turned on in response to a voltage at its gate terminal 17 and field-effect transistor 16 is turned off, the associated wire 3 is connected to receive the potential of upper bus 9. When field-effect transistor 15 is turned off and field-effect transistor 16 is turned on,.in response to a signal at its gate terminal 18, wire 3 is connected to receive the potential of lower bus 10.

A light-emitting cell has the electrical characteristics of a capacitor, and a charging current flows in one direction or the other in wire 3 and bus 9. The field- effect transistors have the advantage...