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Method and apparatus for providing a dielectrophoretic display of visual information

  • US 4,418,346 A
  • Filed: 05/20/1981
  • Issued: 11/29/1983
  • Est. Priority Date: 05/20/1981
  • Status: Expired due to Fees
First Claim
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1. A dielectrophoretic display comprising:

  • a housing formed, at least in part, from a light transmissive material;

    a first electrically neutral material within said housing having a first dielectric constant;

    a second electrically neutral material within said housing having a second dielectric constant different from that of said first material, said second material being visually distinguishable from said first material; and

    means for selectively applying a non-uniform electrical field within said housing to cause relative movement of said first and second materials, including translational movement, as a result of dielectrophoretic forces resulting from said electrical field;

    said means for applying said non-uniform field including at least one electrode and means for selectively varying the charge on said at least one electrode for applying a non-uniform field to said first and second materials;

    said first and second materials being electrically neutral both before and during the application of said non-uniform electrical field thereto;

    whereby the relative positions of said first and second materials may be established by said electrical field to present visually identifiable information.

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