Title: Liquid electrolyte type electrochromic display device

Abstract: An electrochromic display device having first and second electrodes, and a plurality of display electrodes, all immersed in a liquid electrolyte. Drive means act to first generate a potential difference between said first and second electrodes to cause a color species to be deposited on said first electrode and, thereafter, act to generate a potential difference between said first electrode and selected ones of said plurality of display electrodes to cause the color species to be transferred to the selected ones of said plurality of display electrodes. Heptyl viologen dibromide is suggested as one possible electrolyte.

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Inventors: Barclay, Donald John (Winchester, EN)
Bird, Colin Leonard (Eastleigh, EN)
Hallett, Michael Henry (Chandlers Ford, EN)
Kirkman, David Horrobin (West Moors, EN)
Minshull, John Francis (Winchester, EN)
Owen, Charles Edward (Chandlers Ford, EN)

Application Number: 683455
Filing Date: 1976-05-05
Publication_date: 1978-05-30
Assignee: International Business Machines Corporation (Armonk, NY)
Primary Class(es): 345/49 345/204, 359/270, 359/272
Other Classes:
US Patent Ref:

3443859	May, 1969	Rogers	340/324.
3609747	Sep, 1971	Ngo	340/324.
3839857	Oct, 1974	Berets et al.	340/324.
3912368	Oct, 1975	Ponjee et al.	340/324.
3938131	Feb, 1976	Van Doorn et al.	340/324.

Other Refs:
Primary Examiner: Curtis, Marshall M.
Assistant Examiner:
Attorney: Jordan; John A., Wiener; Bernard N.