Patent EP0054587A1 successfully refreshed from Google Patents.
EP0054587A1
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EP
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Metal diphthalocyanine electrochromic displays and electrolytes therefor
Assignee: International Business Machines Corp
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Filing: 1980-12-19
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Granted: —
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Expires: 2000-12-19
Abstract
Abstract The lifetime of a metal diphthalocyanine electrochromic display can be substantially extended by employing a predominantly non-aqueous low hydroxyl ion electrolyte. A preferred electrolyte solvent is ethylene glycol and preferred conductivity salts are tetraethyl ammonium fluoride and sodium chloride. In the case of sodium chloride, conductivity is improved by the addition of up to 25% water to the electrolyte.
Inventors
- 👤 Gilbert Christopher Collins
- 👤 David Jorge Schiffrin
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 22:22
CPC Classifications
C; C09; C09K; C09K9/00; C09K9/02; G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1516
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
61 words
An electrochromic display having display electrodes and a counter electrode, a layer on the display electrodes comprising an electrochromic metal diphthalocyanine or modified diphthalocyanine and a liquid electrolyte in contact with the electrochromic layer and comprising a conductivity salt dissolved in a solvent, characterised in that the solvent is predominantly non-aqueous and the electrolyte contains no other source of hydroxyl ions.
Claim 2
Dependent Claim
61 words
An electrochromic display having display electrodes and a counter electrode, a layer on the display electrodes comprising an electrochromic metal diphthalocyanine or modified diphthalocyanine and a liquid electrolyte in contact with the electrochromic layer and comprising a conductivity salt dissolved in a solvent, characterised in that the solvent is predominantly non-aqueous and the electrolyte contains no other source of hydroxyl ions.
Claim 3
Dependent Claim
21 words
An electrochromic display as claimed in claim 1 in which the solvent contains no more than 25% by weight of water.
Claim 4
Dependent Claim
18 words
An electrochromic display as claimed in claim 2 in which the solvent is substantially free of hydroxyl ions.
Claim 5
Dependent Claim
32 words
An electrochromic display as claimed in any preceeding claim in which the solvent or its non-aqueous portion is either a polyhydric alcohol, a polyhydric ether or a glyme or a mixture thereof.
Claim 6
Dependent Claim
19 words
An electrochromic display as claimed in claim 4 in which the solvent or its non-aqueous portion is ethylene glycol.
Claim 7
Dependent Claim
35 words
An electrochromic display as claimed in any preceeding claim in which the conductivity salt is sodium chloride and the solvent is a mixture of ethylene glycol and no more than 25% by weight of water.
Claim 8
Dependent Claim
25 words
An electrochromic display as claimed in any one of claims 1 to 5 in which the conductivity salt is an organic ionic chloride or fluoride.
Claim 9
Dependent Claim
24 words
An electrochromic display as claimed in claim 7 in which the solvent consists of ethylene glycol and the conductivity salt is tetraethyl ammonium fluoride.
Claim 10
Dependent Claim
19 words
An electrochromic display as claimed in any preceeding claim in which the electrochromic metal diphthalocyanine complex is lutetium diphthalocyanine.
Claim 11
Dependent Claim
18 words
An electrochromic display as claimed in any preceeding claim in which the display electrodes are made of platinum.
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