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Electrochromic display devices comprising thienylidene pyrazoline compounds

  • US 4,090,782 A
  • Filed: 05/31/1977
  • Issued: 05/23/1978
  • Est. Priority Date: 05/31/1977
  • Status: Expired due to Term
First Claim
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1. A reversible electrochromic display device comprising a reactive medium between two electrically conductive electrodes, at least one of which is transparent, said medium comprising an anhydrous solvent and an oxidant/reductant pair in which the reductant is an electron acceptor and the oxidant is a thienylidene pyrazoline compound having the formulawherein R equals a phenyl or thienyl ring which may be substituted with an electron releasing group and each of R1 and R2 is hydrogen or lower alkyl.

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