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Display apparatus using thermochromic material

  • US 5,202,677 A
  • Filed: 01/31/1991
  • Issued: 04/13/1993
  • Est. Priority Date: 01/31/1991
  • Status: Expired due to Fees
First Claim
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1. A visual display apparatus comprising:

  • a substrate having a visible display area;

    means for controlling the temperature of the visible display area of the substrate;

    a first thermochromic material covering a first portion of the visible display area, the first thermochromic material changing, as a result of a first temperature change, from a first colored state to a second generally transparent state; and

    a second thermochromic material covering a second portion of the visible display area, the second thermochromic material changing as a result of a second temperature change, from a first colored state to a second generally transparent state,wherein the first and second thermochromic materials combine to form a substantially single thermochromic layer on the visible display area of the substrate,wherein one of the first and second portions defines, at least in part, a positive representation of a desired display image and the other one of the first and second portions defines, at least in part, a negative representation of the same desired display image at the same place on the visible display area, andwherein the first and second thermochromic materials have the same color when in their respective first colored states.

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