Gas panel with improved circuit for write operation
AssigneeIBM Corporation
InventorTony Nick Criscimagna
Life of this patent
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Abstract
An improved write circuit for a gas panel produces a sequence of alternating polarity write pulses that are superimposed on a sequence of half cycle pulses of the sustain waveform. Thus the accumulation of charges on the walls of a light-emmitting cell that is required for a write operation is produced by a sequence of write pulses, and each write pulse is lower in amplitude than is required for a single write pulse. The write pulses are progressively shifted ahead in phase to further improve the operation.
Claims6
In a gas panel of the type having light emitting cells formed at crossover points of horizontal and vertical conductors and means for producing an alternating polarity sustain waveform across the conductors for each cell, the improvement comprising,
- means for producing opposite polarity write pulses of an amplitude and width to establish a value of wall charge accumulation that is less than the value required for a write operation, and
- means for applying said write pulses to the horizontal and vertical conductors of a selected cell in the polarity of the sustain waveform for a plurality of sequential sustain half cycles to produce a write operation.
Dependencies are inferred from the claim text.