US4240716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodeposition display device
Assignee: AT&T Inc
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Filing: 1978-12-15
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Granted: 1980-12-23
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Expires: 1998-12-15
Abstract
Abstract An electrodeposition display device is described which uses an electrolyte containing silver species and certain anion species including iodide and bromide. The electrolyte also contains an opacifier made up of solid semiconductor substance and solid insulator substance. Such display devices have high contrast, large viewing angle and a pleasing variety of colors including blue, red and brown.
Inventors
- 👤 Irfan Camlibel
- 👤 Shobha Singh
- 👤 LeGrand G. Van Uitert
- 👤 George J. Zydzik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:09
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1506
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
80 words
An electrodeposition display system comprising: (a) positive and negative electrodes; (b) electrolyte comprising organic solvent, silver-containing ionic species, and a mixed opacifier; in which electrical activation of the positive and negative electrodes produces an electrical action which leads to electrodeposition of a partially opaque silver species thereby altering the optical contrast of the display characterized in that the opacifier comprises a solid semiconducting substance and a solid insulator substance which are light in color and chemically compatible with the electrolyte.
Claim 2
Dependent Claim
80 words
An electrodeposition display system comprising: (a) positive and negative electrodes; (b) electrolyte comprising organic solvent, silver-containing ionic species, and a mixed opacifier; in which electrical activation of the positive and negative electrodes produces an electrical action which leads to electrodeposition of a partially opaque silver species thereby altering the optical contrast of the display characterized in that the opacifier comprises a solid semiconducting substance and a solid insulator substance which are light in color and chemically compatible with the electrolyte.
Claim 3
Dependent Claim
24 words
The electrodeposition display device of claim 1 in which the semiconducting substance has a conductivity of at least 10 -9 mhos/cm at room temperature.
Claim 4
Dependent Claim
24 words
The electrodeposition display device of claim 2 in which the semiconducting substance has a conductivity of at least 10 -7 mhos/cm at room temperature.
Claim 5
Dependent Claim
19 words
The electrodeposition display device of claim 1 in which the opacifier comprises between 1-90 weight percent semiconductor, remainder insulator.
Claim 6
Dependent Claim
18 words
The electrodeposition display device of claim 4 in which the opacifier comprises 20-70 weight percent semiconductor, remainder insulator.
Claim 7
Dependent Claim
20 words
The electrodeposition display device of claim 5 in which the opacifier consists essentially of 30-40 weight percent semiconductor, remainder insulator.
Claim 8
Dependent Claim
31 words
The electrodeposition display device of claim 1 in which the solid semiconductor substance consists essentially of at least one doped compound selected from the group consisting of uncolored, transition metal oxides.
Claim 9
Dependent Claim
42 words
The electrodeposition display device of claim 7 in which the semiconducting substance consists essentially of at least one doped compound selected from the group consisting of TiO 2 , ZrO 2 , Nb 2 O 5 and Ta 2 O 5 .
Claim 10
Dependent Claim
19 words
The electrodeposition display device of claim 7 in which the dopant concentration ranges from 0.001 to 1.0 weight percent.
Claim 11
Dependent Claim
18 words
The electrodeposition display device of claim 7 in which the solid semiconductor substance is semiconducting TiO 2 .
Claim 12
Dependent Claim
23 words
The electrodeposition display device of claim 10 in which the dopant is iron in the concentration range of 0.005 to 0.025 weight percent.
Claim 13
Dependent Claim
94 words
The electrodeposition display device of claim 1 in which the solid insulating substance is selected from the group consisting of BeO, MgO, ZnO, Al 2 O 3 , Ga 2 O 3 , Sc 2 O 3 , Y 2 O 3 , La 2 O 3 , Gd 2 O 3 , SiO 2 , GeO 2 , BeAl 2 O 4 , ZnGa 2 O 4 , MgAl 2 O 4 , Be 3 Al 2 Si 3 O 12 , GdAlO 3 , NaAlSi 2 O 6 and NaYO 2 .
Claim 14
Dependent Claim
23 words
The electrodeposition device of claim 1 in which the insulator substance consists essentially of a transition metal oxide sufficiently pure to be insulating.
Claim 15
Dependent Claim
29 words
The electrodeposition device of claim 13 in which the solid insulating substance is selected from the group consisting of NaAlSi 2 O 8 and Al 2 O 3 .
Claim 16
Dependent Claim
17 words
The electrodeposition device of claim 1 in which the solvent has a pK a greater than 9.
Claim 17
Dependent Claim
18 words
The electrodeposition device of claim 15 in which the solvent has a pK a value greater than 12.
Claim 18
Dependent Claim
20 words
The electrodeposition device of claim 1 in which the solvent is selected from the group consisting of dimethylsulfoxide and N,N-dimethylformamide.
Claim 19
Dependent Claim
27 words
The electrodeposition display device of claim 1 in which the electrolyte comprises a silver-containing ionic species selected from the group consisting of silver iodide and silver bromide.
Claim 20
Dependent Claim
28 words
The electrodeposition device of claim 1 in which the electrolyte comprises in addition iodide containing compound selected from the group consisting of alkali metal iodides and ammonium iodide.
Claim 21
Dependent Claim
29 words
The electrodeposition display device of claim 1 in which the electrolyte comprises in addition bromide containing compound selected from the group consisting of alkali metal bromides and ammonium bromide.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |