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Electroscopic information display and entry system with writing stylus

  • US 4,520,357 A
  • Filed: 07/23/1982
  • Issued: 05/28/1985
  • Est. Priority Date: 07/23/1982
  • Status: Expired due to Fees
First Claim
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1. An information display and energy system, comprising:

  • an electroscopic display having a multiplicity of individually-actuatable display cells arranged in a matrix, each cell including a flat plate electrode of magnetically-attractable material and moveable between first and second positions substantially parallel, and with respect, to a fixed planar electrode to provide first and second respective display conditions;

    means for actuating the plate electrode of each individual one of said cells between said first and second display positions responsive to display data;

    means connectable between the cell plate electrode and the associated fixed electrode of an individual one of said display cells for measuring a change in the capacitance between the plate and fixed electrodes of said cell;

    means for sequentially connecting said measuring means to each of the cells of said display;

    a magnetic member completely external to said display and manually positionable adjacent to a selected cell to cause movement only of the plate electrode of that selected cell only from the first position to the second position;

    means for storing the display data determining the state of each display cell; and

    means connected to said storing means and separately connected to both said connecting means and said measuring means for determining, by comparison of matrix location data for each display cell with a relatively large total capacitance with the display data in said storing means, which of said cells, if any, has been acted upon by said external magnetic member to cause the total cell capacitance to increase responsive to data input to said system.

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