Electrolyte for an electrochromic display
First Claim
1. An electrolyte for an electrochromic display of the kind in which a persistent colored species of an electrochromic substance in solution is deposited onto a display electrode upon the passage of current therethrough, the electrolyte comprising an electrochromic di-alkyl bipyridinium salt and a non-polymeric monohydric aliphatic alcohol, both in aqueous solution, taken from the group consisting of a and b where(a) both alkyl groups of the bipyridinium salt have seven carbon atoms and the alcohol has and even number of carbon atoms;
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Abstract
An electrolyte for an electrochromic display of the kind in which a persistent colored species of an electrochromic substance in solution is deposited onto a display electrode upon the passage of current therethrough is disclosed. The electrolyte comprises an aqueous solution of a di-alkyl bipyridinium salt and a non-polymeric aliphatic alcohol in which either: (a) both alkyl groups of the bipyridinium salt have an odd number of carbon atoms and the alcohol has an even number of carbon atoms; or (b) both alkyl groups of the bipyridinium salt have an even number of carbon atoms and the alcohol has an odd number of carbon atoms. The presence of an alcohol in the electrolyte inhibits recrystallization (spotting) and non-erasure of the display electrodes. A particularly effective alcohol for 1,1'"'"' di-heptyl 4,4'"'"' bipyridinium dibromide, which has a severe lifetime problem, is n-hexanol.
28 Citations
12 Claims
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1. An electrolyte for an electrochromic display of the kind in which a persistent colored species of an electrochromic substance in solution is deposited onto a display electrode upon the passage of current therethrough, the electrolyte comprising an electrochromic di-alkyl bipyridinium salt and a non-polymeric monohydric aliphatic alcohol, both in aqueous solution, taken from the group consisting of a and b where
(a) both alkyl groups of the bipyridinium salt have seven carbon atoms and the alcohol has and even number of carbon atoms; - and
(b) both alkyl groups of the bipyridinium salt have six carbon atoms and the alcohol has an odd number of carbon atoms. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification
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- Resources
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Current AssigneeInternational Business Machines Corporation
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Original AssigneeInternational Business Machines Corporation
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InventorsBird, Colin L., Barltrop, John A., Collins, Gilbert C. S.
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Primary Examiner(s)Gron, Teddy S.
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Application NumberUS06/146,824Time in Patent Office1,044 DaysField of Search350/357, 252/408, 252/600US Class Current359/270CPC Class CodesC09K 9/02 Organic tenebrescent materialsG02F 1/1503 caused by oxidation-reducti...
