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Gas display panel with light pen

  • US 3,976,992 A
  • Filed: 01/03/1975
  • Issued: 08/24/1976
  • Est. Priority Date: 01/03/1975
  • Status: Expired due to Term
First Claim
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1. A gas panel of the type having row and column coordinate wires forming a matrix of light emitting cells, means for applying a sustain voltage to said row wires and a different sustain voltage to said column wires to produce an alternating polarity sustain voltage across each cell to produce a succession of brief light flashes from any previously written cell, and means for addressing particular row and column wires for write and erase operations, the improvement comprising,means for disturbing the timing of the leading edge of a sustain voltage of the cells of an addressed coordinate wire, whereby each previously written cell of the addressed coordinate produces a light flash at a time different from the light flash of other previously written cells, andmeans including a light pen positionable at a cell of the array for detecting a light flash at the time of the leading edge of the disturbed sustain voltage and for signalling the address of the addressed coordinate.

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