Electrochromic display device capable of display in plural colors

  • US 4,983,957 A
  • Filed: 05/20/1988
  • Issued: 01/08/1991
  • Est. Priority Date: 05/29/1987
  • Status: Expired due to Fees
First Claim
Patent Images

1. An electrochromic device, comprising;

  • a transparent first substrate laid with a transparent electrode layer;

    a second substrate which comprises an electrode layer and is arranged opposite to and spaced from the first substrate such that the electrode layers of the respective substrates are opposite to each other;

    a first electrochromic layer which is formed on the electrode layer of the first substrate and is formed of a first electrochromic material selected from a group of materials of a particular coloring type and which takes on a characteristic first color in its electrochemically fully oxidized state;

    a second electrochromic layer which is formed on the electrode layer of the second substrate and is formed of a second electrochromic material selected from said group of materials and which takes on a characteristic second color different from said first color in its electrochemically fully oxidized state;

    seal means for holding the first and second substrates in the opposite and spaced arrangement and airtightly defining a space between the first and second substrates; and

    an electrolyte liquid which fills up the space defined between the first and second substrates.

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