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US4304465A
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US
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Electrochromic display device
Assignee: Lenovo Singapore Pte Ltd
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Filing: 1979-10-29
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Granted: 1981-12-08
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Expires: 1999-10-29
Abstract
Abstract An electrochromic display device has a polymer film on the display electrode. In the writing step the polymer film on the display electrode is oxidized to a colored, non-transparent form. In the erasing step the polymer film is reduced to a neutral transparent form. A film of polyaniline is used in a preferred embodiment. A film of polypyrrole is used in another embodiment.
Inventors
- 👤 Arthur F. Diaz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:04
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: 13
Claim 1
Independent Claim
73 words
An electrochromic display device comprising a hollow panel enclosing an electrolyte and having a first transparent face and a second face, a counter electrode located on the inner surface of said transparent face, a display electrode on the inner surface of said second face, and a polymer film of a polypyrrole on said display electrode wherein varying the potential of said display electrode causes said polymer film to change in color and transparency.
Claim 2
Dependent Claim
73 words
An electrochromic display device comprising a hollow panel enclosing an electrolyte and having a first transparent face and a second face, a counter electrode located on the inner surface of said transparent face, a display electrode on the inner surface of said second face, and a polymer film of a polypyrrole on said display electrode wherein varying the potential of said display electrode causes said polymer film to change in color and transparency.
Claim 3
Dependent Claim
79 words
An electrochromic display device comprising a hollow panel enclosing an electrolyte and having a first transparent face and a second face, a counter electrode located on the inner surface of said transparent face, a display electrode on the inner surface of said second face, and a polymer film selected from the group consisting of polyaniline and polynaphthylamines on said display electrode wherein varying the potential of said display electrode causes said polymer film to change in color and transparency.
Claim 4
Dependent Claim
79 words
An electrochromic display device comprising a hollow panel enclosing an electrolyte and having a first transparent face and a second face, a counter electrode located on the inner surface of said transparent face, a display electrode on the inner surface of said second face, and a polymer film selected from the group consisting of polyaniline and polynaphthylamines on said display electrode wherein varying the potential of said display electrode causes said polymer film to change in color and transparency.
Claim 5
Dependent Claim
21 words
A device as claimed in claim 2 or claim 1 wherein said polymer film has a thickness of 0.01μ to 5μ.
Claim 6
Dependent Claim
18 words
A device as claimed in claim 3 wherein said polymer film has a thickness of 0.05μ to 1μ.
Claim 7
Dependent Claim
14 words
A device as described in claim 2 wherein said polymer film is a polyaniline.
Claim 8
Dependent Claim
14 words
A device as described in claim 2 wherein said polymer film is a polynaphthylamine.
Claim 9
Dependent Claim
14 words
A device as described in claim 1 wherein said polypyrrole film contains a N-substituent.
Claim 10
Dependent Claim
73 words
An electrochromic display device comprising a hollow panel enclosing an electrolyte and having a first transparent face and a second face, a counter electrode located on the inner surface of said transparent face, a display electrode on the inner surface of said second face, and a polymer film of N-phenyl polypyrrole on said display electrode wherein varying the potential of said display electrode causes said polymer film to change in color and transparency.
Claim 11
Dependent Claim
73 words
An electrochromic display device comprising a hollow panel enclosing an electrolyte and having a first transparent face and a second face, a counter electrode located on the inner surface of said transparent face, a display electrode on the inner surface of said second face, and a polymer film of N-phenyl polypyrrole on said display electrode wherein varying the potential of said display electrode causes said polymer film to change in color and transparency.
Claim 12
Dependent Claim
73 words
An electrochromic display device comprising a hollow panel enclosing an electrolyte and having a first transparent face and a second face, a counter electrode located on the inner surface of said transparent face, a display electrode on the inner surface of said second face, and a polymer film of N-methyl polypyrrole on said display electrode wherein varying the potential of said display electrode causes said polymer film to change in color and transparency.
Claim 13
Dependent Claim
73 words
An electrochromic display device comprising a hollow panel enclosing an electrolyte and having a first transparent face and a second face, a counter electrode located on the inner surface of said transparent face, a display electrode on the inner surface of said second face, and a polymer film of N-methyl polypyrrole on said display electrode wherein varying the potential of said display electrode causes said polymer film to change in color and transparency.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |