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Shaped Sustain Waveform for AC Plasma Display Panels for Reducing Panel Peak Currents

IP.com Disclosure Number: IPCOM000050672D
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 20K

Publishing Venue

IBM

Related People

Pleshko, P: AUTHOR

Abstract

In a conventional AC plasma display panel being sustained with a square waveform, the cells in the panel fire with little time dispersion, producing a high amplitude peak current. This large peak current produces large voltage drops between the sustain circuit and the panel, and also requires large or multiple devices for the sustain circuitry to be able to handle the high current.

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Shaped Sustain Waveform for AC Plasma Display Panels for Reducing Panel Peak Currents

In a conventional AC plasma display panel being sustained with a square waveform, the cells in the panel fire with little time dispersion, producing a high amplitude peak current. This large peak current produces large voltage drops between the sustain circuit and the panel, and also requires large or multiple devices for the sustain circuitry to be able to handle the high current.

The ramped waveform shown in the drawing staggers individual cell firings, thus increasing the dispersion of the panel current waveform and thereby reducing the peak current. A representative set of waveform parameters would be a sloped portion of 25 volts amplitude with a rise time of 2-3 microseconds. Reducing the peak sustain current in a panel allows more cells to be driven by the same sustain circuitry.

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