Light modulating cell

  • US 5,078,480 A
  • Filed: 01/10/1990
  • Issued: 01/07/1992
  • Est. Priority Date: 07/24/1987
  • Status: Expired due to Fees
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First Claim
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1. A light-modulating cell, comprising:

  • (1) a first electrode, transparent or substantially transparent and electronically conducting;

    (2) a second electrode, spaced transversely from the first electrode and electronically conducting;

    (3) a layer of material having ionic electroconductivity, in contact with and interposed between the first and second electrodes, comprising a homogeneous mixture of solid consistency, comprising (a) a hydrosoluble salt or a hydrosoluble mixture of salts of at least one metal which can be cathodically deposited from an aqueous solution of one of its simple or complex ions, (b) at least one initially hydrosoluble film-forming polymer resin, (c) water, and (d) an auxiliary redox couple;

    the constituents (a), (b), (c), and (d) selected in a group allowing plastic or viscoelastic deformability;

    (4) means for ensuring mechanical and structural cohesion and integrity of the cell;

    (5) means for ensuring permanence of internal electrical contacts between the first electrode, the material and the second electrode;

    (6) spacer means to maintain the first and the second electrodes spaced transversely from each other; and

    (7) electrical connection zones on the first and second electrodes;

    wherein the cell enables (a) writing at least one picture element as an increase in optical density in an interface region between the first electrode and the material, (b) maintaining such a written picture element, (c) reversibly, erasure of such a picture element as a reduction or disappearance of the increase in the optical density obtained during writing, and (d) maintaining the erased state of the picture element.

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