EP0032991A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Reversible electrochromic display device
Assignee: International Business Machines Corp
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Filing: 1980-12-04
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Granted: —
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Expires: 2000-12-04
Abstract
Abstract Reversible electrochromic display device having a memory including a unit cell with working and counter electrode therein and means for applying an electric field across said electrodes and for reversing polarity. The electrochromic activity is derived from a doped polymeric resin having electrochromic active molecules covalently bonded thereto. The dopant is a non-electroactive ionic salt. It acts to increase switching speeds in potentiostatic writing modes.
Inventors
- 👤 Edward Martin Engler
- 👤 Frank Benjamin Kaufman
- 👤 Albert Henry Schroeder
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 07:06
CPC Classifications
C; C09; C09K; C09K9/00; C09K9/02; G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1516; G02F1/15165
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
Reversible electrochromic display device having memory including an unit cell with working and counter electrodes therein, means for applying an electric field across said electrodes and for reversing polarity, a solution of an electrolyte for the transport of electrons from said working electrode to said counter electrode, characterized by a layer of polymer resin coated on said working electrode, said resin having electroactive molecules covalently bonded thereto and a non-electroactive dopant incorporated therein.
Claim 2
Dependent Claim
73 words
Reversible electrochromic display device having memory including an unit cell with working and counter electrodes therein, means for applying an electric field across said electrodes and for reversing polarity, a solution of an electrolyte for the transport of electrons from said working electrode to said counter electrode, characterized by a layer of polymer resin coated on said working electrode, said resin having electroactive molecules covalently bonded thereto and a non-electroactive dopant incorporated therein.
Claim 3
Dependent Claim
29 words
Device as claimed in claim 1, wherein said non-electroactive dopant is selected from the group consisting of tetrabutylammonium perchlorate (TBAP), tetrahexylammonium perchlorate (THAP), tetracylanoquinodiamethane (TCNQ) and Variamine Blue B.
Claim 4
Dependent Claim
35 words
Device as claimed in claim 2, wherein said electroactive molecules are selected from the group consisting of pyrazoline derivatives, tetrathiafulvalene (TTF) and its deriratives, SE analoqs (TSeF) and its derivatives, p-tetracyanoquinomethane, nicked bis(dithiolene) and benzoquinone.
Claim 5
Dependent Claim
24 words
Device as claimed in claim 3, wherein said resin having said electroactive molecule bonded thereto is polyvinylbenzylphenoxy tetrathiafulvalene and said non-electroactive dopant is TBAP.
Claim 6
Dependent Claim
25 words
Device as claimed in claim 4 wherein said resin having said electroactive molecule bonded thereto is polyvinylbenzylphenoxy tetrathiafulvalene and said non-electroactive ionic salt is THAP.
Claim 7
Dependent Claim
24 words
Device as claimed in claim 4 wherein said resin having said electroactive molecule bonded thereto is polyvinylbenzylphenoxy tetrathiafulvalene and said non-electroactive salt is TCNQ.
Claim 8
Dependent Claim
26 words
Device as claimed in claim 4, wherein said resin having said electroactive molecule bonded thereto is polyvinylbenzylphenoxy tetrathiafulvalene and said non-electroactive salt is Variamine Blue B.
Claim 9
Dependent Claim
18 words
Device as claimed in claim 3 wherein said resin having said electroactive molecule bonded thereto is polyvinylbenzyl- carboxytetrathiafulvalene.
Claim 10
Dependent Claim
16 words
Device as claimed in claim 8, wherein said resin having said electroactive molecule bonded thereto is
Claim 11
Dependent Claim
11 words
Device as claimed in claim 3, wherein said non-electroactive dopant is
References Cited (Backward Citations)
GB2021277A
Cited
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