Patent US4129861A successfully refreshed from Google Patents.
US4129861A
Expired / Lapsed
US
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Multiplex addressing of electrochromic displays
Assignee: Wyeth Holdings LLC
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Filing: 1976-01-27
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Granted: 1978-12-12
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Expires: 1996-01-27
Abstract
Abstract An electrochromic data display and imaging device which may be formed by sandwich arrangement of the imaging area and the counter-electrode area with a suitable ion-conducting layer between. The imaging area is in the form of discrete electrochromic areas in a desired pattern, and a circuit is provided for multiplexing these areas to provide alphanumeric or other type displays.
Inventors
- 👤 Robert D. Giglia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:24
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/04; G09G3/16; G09G3/19
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
59 words
A display system comprising a plurality of persistent electrochromic display elements and means to multiplex said display elements, said means comprising diode means to provide a sufficient threshold voltage only to each display element to be displayed or erased and voltage threshold conduction means connected to each display element so that only a directly addressed element will be activated.
Claim 2
Dependent Claim
59 words
A display system comprising a plurality of persistent electrochromic display elements and means to multiplex said display elements, said means comprising diode means to provide a sufficient threshold voltage only to each display element to be displayed or erased and voltage threshold conduction means connected to each display element so that only a directly addressed element will be activated.
Claim 3
Dependent Claim
32 words
The device of claim 1 wherein said persistent electrochromic display elements comprise layered arrangements of a persistent electrochromic material and an ion-conducting medium in contact with a first electrode and a counter-electrode.
Claim 4
Dependent Claim
13 words
The device of claim 2 wherein said persistent electrochromic material is tungsten oxide.
Claim 5
Dependent Claim
17 words
The device of claim 2 wherein said ion-conducting medium is a mixture of sulfuric acid and glycerin.
Claim 6
Dependent Claim
11 words
The device of claim 2 wherein said counter-electrode comprises tungsten oxide.
Claim 7
Dependent Claim
27 words
A display means defined by claim 1 further comprising capacitor means in the supply circuit to each element in parallel with the opposed electrodes of the element.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-11 | 1982-06-12 | 1982-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-11 | 1986-06-12 | 1986-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-11 | 1990-06-12 | 1990-12-12 | $7700.00 | Window Closed / Lapsed |