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Passive matrix display with bistable electro-wetting cells

  • US 7,561,131 B2
  • Filed: 02/18/2004
  • Issued: 07/14/2009
  • Est. Priority Date: 02/26/2003
  • Status: Expired due to Fees
First Claim
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1. A display unit comprising at least one electro-wetting pixel, each electro-wetting pixel comprising:

  • a closed cell;

    a polar liquid and a non-polar liquid, said liquids being immiscible, having different optical properties and being contained in said cell;

    a counter electrode; and

    at least one electrode pair, each electrode pair comprising an address electrode and a retain electrode, said address and retain electrodes being separated from said liquids by a surface that is lyophobic in relation to only one of said liquids; and

    wherein said address and retain electrodes are arranged at respective electric potentials to control a spatial distribution of said liquids and thereby defining a multi-stable pixel state, andwherein a current state is retained by applying a potential to the retain electrode in relation to the counter electrode and removing any potential from the address electrode in relation to the counter electrode.

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