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Display device comprising rotating display elements having a plurality of faces, and display panel composed of such devices

  • US 5,057,828 A
  • Filed: 10/10/1989
  • Issued: 10/15/1991
  • Est. Priority Date: 10/12/1988
  • Status: Expired due to Fees
First Claim
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1. A display device, comprising:

  • an array of rotatable display elements, each display element having at least two faces of different color, the display elements being arranged in rows and columns;

    first and second means for determining rotation of the rotatable elements to change which face of each rotating element is displayed by the display device;

    means for controlling the first and second means for determining rotation, so as to form an image to be displayed by the display device;

    at least one common shaft on which the rotatable display elements of each row or column rotate, the common shaft mounted in a frame of the display device;

    friction couplings for connecting respective rotating elements to one of the common shafts; and

    retractable members for inhibiting rotation of all rotating elements of respective columns or rows;

    wherein each first means for determining rotation includes only one device for rotating in a step-by-step manner each common shaft; and

    wherein each second means for determining rotation corresponds to only one retractable member.

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