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Electrochromic composition and electrochromic display device using same

  • US 4,210,390 A
  • Filed: 06/27/1978
  • Issued: 07/01/1980
  • Est. Priority Date: 06/28/1977
  • Status: Expired due to Term
First Claim
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1. An electrochromic composition comprising a solvent, an electrochromic compound which is colored in a reduced state, the solubility to the solvent of which is not less than 10-2 mol/100 g-solvent in said reduced state and not less than 10-1 mol/100 g-solvent in an oxidized state, and an additive compound selected from the group consisting of (a) ammonia, (b) an amine where all substituents thereof are radicals selected from the group of aliphatic radicals, alicyclic radicals and aromatic radicals and (c) an alkali compound selected from the group consisting of hydroxides, carbonates, and phosphates, said electrochromic compound occurring in said reduced state and the solution of the reduced electrochromic compound being basic due to the presence of said additive compound.

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