US4399436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochromic display devices
Assignee: Sharp Corp
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Filing: 1981-05-29
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Granted: 1983-08-16
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Expires: 2001-05-29
Abstract
Abstract An electrochromic display device comprises a plurality of display segmented electrodes and first additional electrodes, a layer of an electrochromic material in contact with each of the display segmented electrodes and the first additional electrodes, a first connecting circuit for selectively connecting each of the display segmented electrodes into one of two groups, depending on a display pattern to be indicated, a counting circuit for counting the electrodes and determining the difference in display area between the two groups of display segmented electrodes, a circuit responsive to the difference in display area for connecting each of the first additional electrodes into one of the two groups of the display segmented electrodes, a power supply for supplying power to each of the two groups of the first additional electrodes and the display segmented electrodes, and a second additional electrode for keeping the total amount of charge for coloring all the display electrodes constant.
Inventors
- 👤 Hiroshi Hamada
- 👤 Kohzo Yano
- 👤 Katubumi Koyanagi
- 👤 Hiroshi Take
- 👤 Yasuhiko Inami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:52
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/04; G09G3/16
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
154 words
An electrochromic display device comprising: a plurality of display segmented electrodes and first additional electrodes; a layer of an electrochromic material in contact with each of the display segmented electrodes and the first additional electrodes; first connecting means for selectively connecting each of said display segmented electrodes into one of two groups, depending on a display pattern to be indicated; counting means for counting the display segmented electrodes in at least one group and determining the difference in display area between the two groups of display segmented electrodes; second connecting means responsive to said counting means for connecting each of said first additional electrodes into one of the two groups of the display segmented electrodes; power supply means for supplying power to each of the two groups of the first additional electrodes and display segmented electrodes; and a second additional electrode for keeping the total amount of charge for coloring the display electrodes constant.
Claim 2
Dependent Claim
154 words
An electrochromic display device comprising: a plurality of display segmented electrodes and first additional electrodes; a layer of an electrochromic material in contact with each of the display segmented electrodes and the first additional electrodes; first connecting means for selectively connecting each of said display segmented electrodes into one of two groups, depending on a display pattern to be indicated; counting means for counting the display segmented electrodes in at least one group and determining the difference in display area between the two groups of display segmented electrodes; second connecting means responsive to said counting means for connecting each of said first additional electrodes into one of the two groups of the display segmented electrodes; power supply means for supplying power to each of the two groups of the first additional electrodes and display segmented electrodes; and a second additional electrode for keeping the total amount of charge for coloring the display electrodes constant.
Claim 3
Dependent Claim
13 words
The device of claim 1, wherein said second additional electrode comprises a film.
Claim 4
Dependent Claim
26 words
The device of claim 1, wherein said second additional electrode comprises a mixture of a powder of an active material and another powder of a conductor.
Claim 5
Dependent Claim
17 words
The device of claim 3, wherein said powder of a conductor comprises expanded graphite or active carbon.
Claim 6
Dependent Claim
31 words
The device of claim 1, further comprising third connecting means for connecting said second additional electrode with either of the two groups of the first additional electrodes and display segmented electrodes.
Claim 7
Dependent Claim
36 words
The device of claim 5, further comprising second power supply means for supplying a constant voltage between said second additional electrode and either of the two groups of the first additional electrodes and display segmented electrodes.
Claim 8
Dependent Claim
102 words
The device of claim 1, wherein said second additional electrode comprises material selected from the group comprising: (1) Mg, Al, Zn, Cr, Fe, Ni, Sn, Pb, Tl, Ti, Zr, Cd and In; (2) NiF 2 , NiCl 2 , CuF 2 , CuCl 2 and AgCl; (3) WO 3 , CuS, CuSe, FeS, FeSe, MoOx, WOx (wherein x is more than 1 and not more than 3), tungsten bronze, and Nb 2 Ox (wherein x is more than 2 and not more than 5); and (4) RFe(II) [Fe(III) (CN) 6 ] (in which R is NH 4 , H, K or Na).
References Cited (Backward Citations)
US4175836A
Cited
US4229080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-15 | 1987-02-14 | 1987-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-15 | 1991-02-14 | 1991-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-15 | 1995-02-14 | 1995-08-16 | $7700.00 | Window Closed / Lapsed |