US4167309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochromic display device
Assignee: International Business Machines Corp
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Filing: 1978-02-13
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Granted: 1979-09-11
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Expires: 1998-02-13
Abstract
Abstract An electrochromic display device adapted to be accurately erased has an opaque counter electrode in the shape of a pattern of lines, preferably reticulate, on the underside of the face of the display device through which the display is viewed. The counter electrode is brought to a predetermined potential either by trapping a suitable material capable of a reversible redox reaction at the counter electrode or by initially charging the counter electrode with heptyl vilogen cation radical. This enables voltage erase to be used.
Inventors
- 👤 Donald J. Barclay
- 👤 Colin L. Bird
- 👤 Anthony C. Lowe
- 👤 David H. Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:53
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/153; G02F1/155; G02F1/1503
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
80 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 the said transparent face, said counter electrode containing material that undergoes a reversible redox reaction in said electrolyte at a known potential, said counter electrode being opaque and having the shape of a pattern of lines, and a plurality of display electrodes on the inner surface of said second face.
Claim 2
Dependent Claim
80 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 the said transparent face, said counter electrode containing material that undergoes a reversible redox reaction in said electrolyte at a known potential, said counter electrode being opaque and having the shape of a pattern of lines, and a plurality of display electrodes on the inner surface of said second face.
Claim 3
Dependent Claim
14 words
A device as claimed in claim 1, wherein the pattern of lines is reticulate.
Claim 4
Dependent Claim
16 words
A device as claimed in claim 2, wherein the pattern of lines is a rectangular grid.
Claim 5
Dependent Claim
20 words
A device as claimed in claim 2, wherein each mesh of the reticulate pattern overlies a plurality of display electrodes.
Claim 6
Dependent Claim
16 words
A device as claimed in claim 1, wherein the pattern of lines is in grid-iron form.
Claim 7
Dependent Claim
16 words
A device as claimed in claim 1, wherein the lines of the pattern are not straight.
Claim 8
Dependent Claim
87 words
An electrochromic display device comprising: a hollow panel enclosing an electrolyte containing heptyl viologen dications and having a first transparent face and a second face, a counter electrode located on the inner surface of the said transparent face, said counter electrode containing a material that undergoes a reversible redox reaction in said electrolyte at a known potential, said counter electrode being opaque and conductive and having the shape of a pattern of lines, and a plurality of display electrodes on the inner surface of said second face.
Claim 9
Dependent Claim
87 words
An electrochromic display device comprising: a hollow panel enclosing an electrolyte containing heptyl viologen dications and having a first transparent face and a second face, a counter electrode located on the inner surface of the said transparent face, said counter electrode containing a material that undergoes a reversible redox reaction in said electrolyte at a known potential, said counter electrode being opaque and conductive and having the shape of a pattern of lines, and a plurality of display electrodes on the inner surface of said second face.
Claim 10
Dependent Claim
27 words
A device as claimed in claim 7, wherein said material is trapped within the pores of an nodized Al 2 O 3 layer of said counter electrode.
Claim 11
Dependent Claim
14 words
A device as claimed in claim 7, wherein said material is a redox couple.
Claim 12
Dependent Claim
19 words
A device as claimed in claim 7, wherein said material is the redox couple Fe III /Fe II .
Claim 13
Dependent Claim
22 words
A device as claimed in claim 7, wherein said counter electrode has a layer of chargeable polymeric charge transfer material coated thereon.
Claim 14
Dependent Claim
16 words
A device as claimed in claim 11, wherein said layer of charge transfer material is poly-2-vinylpyridine.
Claim 15
Dependent Claim
23 words
A device as claimed in claim 11, wherein said electrolyte includes heptyl viologen dibromide, and said layer of charge transfer material contains bromine.
References Cited (Backward Citations)
US3712709A
Cited
US4018508A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-09-10 | 1983-03-12 | 1983-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-10 | 1987-03-12 | 1987-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-10 | 1991-03-12 | 1991-09-11 | $7700.00 | Window Closed / Lapsed |