Patent US4279475A successfully refreshed from Google Patents.
US4279475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of control of an electrolytic display cell and a circuit for the application of said method
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
•
Filing: 1979-06-13
•
Granted: 1981-07-21
•
Expires: 1999-06-13
Abstract
Abstract A method of control for a metal halide electrolytic display cell consists in passing a control current through the cell in a first direction during periods of erasure and in the opposite direction during writing periods, a zero control current being maintained during periods of holding in the erased state and during periods of holding in the written state. A low leakage current is superimposed on the control current and passes through the cell in the first direction, at least during the periods of holding in the erased state.
Inventors
- 👤 Gilles Delapierre
- 👤 Robert Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:54
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/163
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
138 words
A display device comprising an electrolytic display cell provided therein with a plurality of transparent electrodes, a counter-electrode and an electrolytic solution containing a metal halide electrolyte, and a control circuit, said control circuit comprising first means for delivering any one of three currents: (1) a writing current having a first direction to facilitate the deposition of a metallic film on the electrodes of the display cell; (2) an erasure current having a second direction opposite to said first direction to facilitate disolving said metallic film; and (3) a zero current to facilitate storage of the display; and wherein said control circuit further comprises second means for delivering a leakage current at least when said zero current is delivered by said first means, said leakage current having a direction corresponding to said erasure current in said second direction.
Claim 2
Dependent Claim
138 words
A display device comprising an electrolytic display cell provided therein with a plurality of transparent electrodes, a counter-electrode and an electrolytic solution containing a metal halide electrolyte, and a control circuit, said control circuit comprising first means for delivering any one of three currents: (1) a writing current having a first direction to facilitate the deposition of a metallic film on the electrodes of the display cell; (2) an erasure current having a second direction opposite to said first direction to facilitate disolving said metallic film; and (3) a zero current to facilitate storage of the display; and wherein said control circuit further comprises second means for delivering a leakage current at least when said zero current is delivered by said first means, said leakage current having a direction corresponding to said erasure current in said second direction.
Claim 3
Dependent Claim
22 words
A display device according to claim 1 wherein said second means for generating the leakage current is continuously connected to the cell.
Claim 4
Dependent Claim
23 words
A display device according to claim 1 wherein said first means comprises a circuit for charging and discharging a capacitor through said cell.
References Cited (Backward Citations)
US4057739A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-20 | 1985-01-19 | 1985-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-20 | 1989-01-19 | 1989-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-20 | 1993-01-19 | 1993-07-21 | $7700.00 | Window Closed / Lapsed |