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Magneto-optic chip with gray-scale capability

  • US 4,661,809 A
  • Filed: 01/11/1985
  • Issued: 04/28/1987
  • Est. Priority Date: 05/05/1982
  • Status: Expired due to Term
First Claim
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1. A magneto-optic chip (42) to achieve gray-scale including a plurality of pixel positions (44);

  • the magneto-optic chip comprising;

    (a) each of the pixel positions including individually-addressable pixel sub-positions (46, 48, 50,

         52);

    (b) at least two of said pixel sub-positions having respective areas of different size; and

    (c) a first pair of conductors (47,

         49) oriented in a first direction and a second pair of conductors (51,

         53) oriented in a second direction to electrically address individual ones of said different sized pixel sub-positions and place a selected one of said pixel sub-positions in a respective one of three magnetic states, which affect the passage of light therethrough at an associated one of three light levels;

    a first magnetic state when magnetized one direction so that the selected pixel sub-position is transparent to light passage, a second magnetic state when magnetized in an opposite direction so that the sub-position is opaque to light passage, and a third magnetic state when demagnetized or stripped out so that the sub-position is both transparent and opaque to light passage, so that an associated amount of light passage through said selected pixel sub-position has one of the three levels of light passage or brightness, and selected pixel sub-positions associated with the respective pixel position develop a desired degree of gray scale at the respective pixel position.

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