Electrochromic display devices comprising thienylidene pyrazoline compounds
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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Abstract
This invention relates to a reversible display device based upon the electrochromic properties of certain thienylidene pyrazoline compounds when used in conjunction with a complementary redox material.
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6 Claims
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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 formula
wherein 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.
Specification