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Addressing a matrix device using electro-optical switching

  • US 5,237,314 A
  • Filed: 10/21/1991
  • Issued: 08/17/1993
  • Est. Priority Date: 11/30/1990
  • Status: Expired due to Fees
First Claim
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1. An addressable matrix device comprising a panel having a row and column matrix array of elements, and driving means for addressing the elements via sets of row and column address conductors of the panel, the driving means comprising a row address conductor drive circuit and a column address conductor drive circuit at least one of which comprises sequence generating means having a plurality of output stages associated with respective address conductors in a group of successive address conductors, and comprising an electro-optic switching arrangement having light sensitive means comprising a plurality of light sensitive switching elements integrated on the panel and a light emitting means comprising a plurality of light emitting elements arranged to cooperate with the light sensitive switching elements, the light sensitive switching elements being operable upon illumination to produce an output from each output stage and the light emitting elements being selectively operable to illuminate particular light sensitive switching elements in predetermined order so as to produce a sequence of outputs from the output stages, characterized in that each output stage comprises a set of two or more light sensitive switching elements each of which elements is arranged to be illuminated by a different light emitting element, in that the number of light emitting elements is at least two greater than the number of light sensitive switching elements in the set, and in that each light emitting element illuminates light sensitive switching elements associated with more than one output stage.

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