US4348077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochromic display device
Assignee: Panasonic Holdings Corp
•
Filing: 1979-11-19
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Granted: 1982-09-07
•
Expires: 1999-11-19
Abstract
Abstract The present invention relates to a display device utilizing an electrochemically reversible coloring reaction and, more specifically, to an electrochromic display device (referred to as ECD hereinafter) which makes it possible to carry out a stable display to appearing-disappearing performance using an iron compound insoluble to an electrolyte as an electrochemical reactant to a counter electrode. In order to operate an ECD stably, it is necessary to stabilize the electro-potential applied to the counter electrode. The ECD of the invention is characterized by using iron berlinate or derivatives thereof as a potential stabilizing material of the counter electrode, and the ECD is constructed with a display electrode and a counter electrode provided with the said compound as a reactive component thereon, thereby making it possible to maintain a stably display function. Furthermore the invention relates also to an ECD using a solid thin film of an electrochromic substance as a display electrode, in which lithium fluoborate is used as a supporting substance of the electrolyte and water is added to the electrolyte in a concentration of 0.1 to 2 Mol/l, thereby improving the temperature performance and response speed of the ECD without affecting its working life thereof.
Inventors
- 👤 Shigeo Kondo
- 👤 Nobuyuki Yoshiike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:58
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/153; G02F1/155; G02F1/1503; G02F1/1514; G02F1/1523; G02F1/1524; G02F1/1516; G02F2001/1517
Claims Analysis
Total Claims: 69
Claim 1
Independent Claim
120 words
An electrochromic display device having a display memory function, comprising: an electrolyte; at least one display electrode disposed in contact with said electrolyte; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 2
Dependent Claim
120 words
An electrochromic display device having a display memory function, comprising: an electrolyte; at least one display electrode disposed in contact with said electrolyte; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 3
Dependent Claim
25 words
The electrochromic display device according to claim 1, wherein said berlinate is selected from the group consisting of iron berlinate, potassium berlinate and sodium berlinate.
Claim 4
Dependent Claim
24 words
The electrochromic display device according to claim 1 wherein said display electrode includes a material selected from tungsten oxide, molybdenum oxide and iridium oxide.
Claim 5
Dependent Claim
17 words
The electrochromic display device according to claim 1 wherein said electrolyte is a solution containing lithium borofluoride.
Claim 6
Dependent Claim
25 words
The electrochromic display device according to claim 1 wherein said electrolyte is made of organic solvent which is mainly composed of propylene carbonate or γ-butyrolactone.
Claim 7
Dependent Claim
23 words
The electrochromic display device according to claim 1 wherein water is contained in said electrolyte in a concentration of 0.1 to 2 M/l.
Claim 8
Dependent Claim
18 words
The electrochromic display device according to claim 1 wherein said electrolyte is an aqueous solution containing 4,4'-dipyridinium compound.
Claim 9
Dependent Claim
121 words
An electrochromic display device having a display memory function, comprising: an electrolyte; at least one display electrode disposed in contact with said electrolyte; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least iron berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 10
Dependent Claim
121 words
An electrochromic display device having a display memory function, comprising: an electrolyte; at least one display electrode disposed in contact with said electrolyte; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least iron berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 11
Dependent Claim
121 words
An electrochromic display device having a display memory function, comprising: an electrolyte; at least one display electrode disposed in contact with said electrolyte; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least potassium berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 12
Dependent Claim
121 words
An electrochromic display device having a display memory function, comprising: an electrolyte; at least one display electrode disposed in contact with said electrolyte; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least potassium berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 13
Dependent Claim
121 words
An electrochromic display device having a display memory function, comprising: an electrolyte; at least one display electrode disposed in contact with said electrolyte; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least sodium berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 14
Dependent Claim
121 words
An electrochromic display device having a display memory function, comprising: an electrolyte; at least one display electrode disposed in contact with said electrolyte; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least sodium berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 15
Dependent Claim
134 words
An electrochromic display device having a display memory function, comprising: an electrolyte which is an aqueous solution containing at least 4,4'-dipyridinium chloride and potassium chloride; at least one display electrode disposed in contact with said electrolyte; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least iron berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 16
Dependent Claim
134 words
An electrochromic display device having a display memory function, comprising: an electrolyte which is an aqueous solution containing at least 4,4'-dipyridinium chloride and potassium chloride; at least one display electrode disposed in contact with said electrolyte; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least iron berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 17
Dependent Claim
21 words
The electrochromic display device according to claim 11, wherein said counter electrode is formed by hot-pressing a material containing iron berlinate.
Claim 18
Dependent Claim
21 words
The electrochromic display device according to claim 12, wherein said material is a mixture of iron berlinate, graphite and polyethylene powder.
Claim 19
Dependent Claim
27 words
The electrochromic display device according to claim 11, wherein said counter electrode is formed by electrically reducing said counter electrode in an aqueous solution of potassium chloride.
Claim 20
Dependent Claim
127 words
An electrochromic display device having a display memory function, comprising: an electrolyte; at least one display electrode disposed in contact with said electrolyte, said display electrode containing tungsten oxide; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least iron berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 21
Dependent Claim
127 words
An electrochromic display device having a display memory function, comprising: an electrolyte; at least one display electrode disposed in contact with said electrolyte, said display electrode containing tungsten oxide; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least iron berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 22
Dependent Claim
20 words
The electrochromic display device according to claim 15, wherein said electrolyte is prepared by dissolving lithium perchlorate in propylene carbonate.
Claim 23
Dependent Claim
21 words
The electrochromic display device according to claim 15, wherein said counter electrode is formed by hot-pressing a material containing iron berlinate.
Claim 24
Dependent Claim
21 words
The electrochromic display device according to claim 17, wherein said material is a mixture of iron berlinate, graphite and polyethylene powder.
Claim 25
Dependent Claim
25 words
The electrochromic display device according to claim 16, wherein said counter electrode is formed by electrically reducing the counter electrode in lithium perchlorate/propylene carbonate solution.
Claim 26
Dependent Claim
127 words
An electrochromic display device having a display memory function, comprising: an electrolyte; at least one display electrode disposed in contact with said electrolyte, said display electrode containing tungsten oxide; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least potassium berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 27
Dependent Claim
127 words
An electrochromic display device having a display memory function, comprising: an electrolyte; at least one display electrode disposed in contact with said electrolyte, said display electrode containing tungsten oxide; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least potassium berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 28
Dependent Claim
20 words
The electrochromic display device according to claim 20, wherein said electrolyte is prepared by dissolving lithium perchlorate in propylene carbonate.
Claim 29
Dependent Claim
21 words
The electrochromic display device according to claim 20, wherein said counter electrode is formed by hot-pressing a material containing potassium berlinate.
Claim 30
Dependent Claim
21 words
The electrochromic display device according to claim 22, wherein said material is a mixture of potassium berlinate, graphite and polyethylene powder.
Claim 31
Dependent Claim
25 words
The electrochromic display device according to claim 21, wherein said counter electrode is formed by electrically reducing the counter electrode in lithium perchlorate/propylene carbonate solution.
Claim 32
Dependent Claim
127 words
An electrochromic display device having a display memory function, comprising: an electrolyte; at least one display electrode disposed in contact with said electrolyte, said display electrode containing tungsten oxide; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least sodium berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 33
Dependent Claim
127 words
An electrochromic display device having a display memory function, comprising: an electrolyte; at least one display electrode disposed in contact with said electrolyte, said display electrode containing tungsten oxide; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least sodium berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 34
Dependent Claim
20 words
The electrochromic display device according to claim 25, wherein said electrolyte is prepared by dissolving lithium perchlorate in propylene carbonate.
Claim 35
Dependent Claim
21 words
The electrochromic display device according to claim 25, wherein said counter electrode is formed by hot-pressing a material containing sodium berlinate.
Claim 36
Dependent Claim
21 words
The electrochromic display device according to claim 27, wherein said material is a mixture of sodium berlinate, graphite and polyethylene powder.
Claim 37
Dependent Claim
25 words
The electrochromic display device according to claim 26, wherein said counter electrode is formed by electrically reducing the counter electrode in lithium perchlorate/propylene carbonate solution.
Claim 38
Dependent Claim
127 words
An electrochromic display device having a display memory function, comprising: an electrolyte; at least one display electrode disposed in contact with said electrolyte, said display electrode containing molybdenum oxide; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least iron berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 39
Dependent Claim
127 words
An electrochromic display device having a display memory function, comprising: an electrolyte; at least one display electrode disposed in contact with said electrolyte, said display electrode containing molybdenum oxide; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least iron berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 40
Dependent Claim
20 words
The electrochromic display device according to claim 30, wherein said electrolyte is prepared by dissolving lithium perchlorate in propylene carbonate.
Claim 41
Dependent Claim
21 words
The electrochromic display device according to claim 30, wherein said counter electrode is formed by hot-pressing a material containing iron berlinate.
Claim 42
Dependent Claim
21 words
The electrochromic display device according to claim 32, wherein said material is a mixture of iron berlinate, graphite and polyethylene powder.
Claim 43
Dependent Claim
25 words
The electrochromic display device according to claim 31, wherein said counter electrode is formed by electrically reducing the counter electrode in lithium perchlorate/propylene carbonate solution.
Claim 44
Dependent Claim
127 words
An electrochromic display device having a display memory function, comprising: an electrolyte; at least one display electrode disposed in contact with said electrolyte, said display electrode containing iridium oxide; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least iron berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 45
Dependent Claim
127 words
An electrochromic display device having a display memory function, comprising: an electrolyte; at least one display electrode disposed in contact with said electrolyte, said display electrode containing iridium oxide; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least iron berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 46
Dependent Claim
20 words
The electrochromic display device according to claim 35, wherein said electrolyte is prepared by dissolving lithium perchlorate in propylene carbonate.
Claim 47
Dependent Claim
21 words
The electrochromic display device according to claim 35, wherein said counter electrode is formed by hot-pressing a material containing iron berlinate.
Claim 48
Dependent Claim
21 words
The electrochromic display device according to claim 37, wherein said material is a mixture of iron berlinate, graphite and polyethylene powder.
Claim 49
Dependent Claim
25 words
The electrochromic display device according to claim 36, wherein said counter electrode is formed by electrically reducing the counter electrode in lithium perchlorate/propylene carbonate solution.
Claim 50
Dependent Claim
137 words
An electrochromic display device having a display memory function, comprising: an electrolyte being propylene carbonate solution of lithium fluoborate having lithium borofluoride; at least one display electrode disposed in contact with said electrolyte, said display electrode containing tungsten oxide; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least iron berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 51
Dependent Claim
137 words
An electrochromic display device having a display memory function, comprising: an electrolyte being propylene carbonate solution of lithium fluoborate having lithium borofluoride; at least one display electrode disposed in contact with said electrolyte, said display electrode containing tungsten oxide; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least iron berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 52
Dependent Claim
21 words
The electrochromic display device according to claim 40, wherein said counter electrode is formed by hot-pressing a material containing iron berlinate.
Claim 53
Dependent Claim
21 words
The electrochromic display device according to claim 41, wherein said material is a mixture of iron berlinate, graphite and polyethylene powder.
Claim 54
Dependent Claim
24 words
The electrochromic display device according to claim 41, wherein said counter electrode is formed by electrically reducing the counter electrode in said electrolyte solution.
Claim 55
Dependent Claim
131 words
An electrochromic display device having a display memory function, comprising: an electrolyte containing at least γ-butyrolactone; at least one display electrode disposed in contact with said electrolyte, said display electrode containing tungsten oxide; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least iron berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 56
Dependent Claim
131 words
An electrochromic display device having a display memory function, comprising: an electrolyte containing at least γ-butyrolactone; at least one display electrode disposed in contact with said electrolyte, said display electrode containing tungsten oxide; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least iron berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 57
Dependent Claim
19 words
The electrochromic display device according to claim 44, wherein said electrolyte is prepared by dissolving lithium perchlorate in γ-butyrolactone.
Claim 58
Dependent Claim
21 words
The electrochromic display device according to claim 44, wherein said counter electrode is formed by hot-pressing a material containing iron berlinate.
Claim 59
Dependent Claim
21 words
The electrochromic display device according to claim 46, wherein said material is a mixture of iron berlinate, graphite and polyethylene powder.
Claim 60
Dependent Claim
22 words
The electrochromic display device according to claim 45, wherein said counter electrode is formed by electrically reducing the counter electrode in γ-butyrolactone.
Claim 61
Dependent Claim
141 words
An electrochromic display device having a display memory function; comprising: an electrolyte containing water in a concentration of 0.1 to 2 mol per liter; at least one display electrode disposed in contact with said electrolyte, said display electrode being made of tungsten oxide; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least iron berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 62
Dependent Claim
141 words
An electrochromic display device having a display memory function; comprising: an electrolyte containing water in a concentration of 0.1 to 2 mol per liter; at least one display electrode disposed in contact with said electrolyte, said display electrode being made of tungsten oxide; at least one counter electrode spaced from said display electrode and disposed in contact with the electrolyte, said counter electrode containing at least iron berlinate which is insoluble in the electrolyte; and means for applying first and second electric potentials between said display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 63
Dependent Claim
20 words
The electrochromic display device according to claim 49, wherein said electrolyte is prepared by dissolving lithium perchlorate in propylene carbonate.
Claim 64
Dependent Claim
21 words
The electrochromic display device according to claim 49, wherein said counter electrode is formed by hot-pressing a material containing iron berlinate.
Claim 65
Dependent Claim
21 words
The electrochromic display device according to claim 51, wherein said material is a mixture of iron berlinate, graphite and polyethylene powder.
Claim 66
Dependent Claim
25 words
The electrochromic display device according to claim 50, wherein said counter electrode is formed by electrically reducing the counter electrode in lithium perchlorate/propylene carbonate solution.
Claim 67
Dependent Claim
173 words
An electrochromic display device having a display memory function, comprising: an electrolyte; at least one display electrode disposed in contact with said electrolyte; a clear plate supporting said display electrode; at least one counter electrode spaced from the display electrode and disposed in contact with the electrolyte, said counter electrode containing at least berlinate which is insoluble in the electrolyte; a back plate supporting said counter electrode; a light scattering plate disposed between said clear plate and back plate; means for connecting said clear plate and back plate and for sealing to prevent flow-out of the electrolyte filled between said clear plate and back plate; and means for applying said first and second electric potentials between the display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 68
Dependent Claim
173 words
An electrochromic display device having a display memory function, comprising: an electrolyte; at least one display electrode disposed in contact with said electrolyte; a clear plate supporting said display electrode; at least one counter electrode spaced from the display electrode and disposed in contact with the electrolyte, said counter electrode containing at least berlinate which is insoluble in the electrolyte; a back plate supporting said counter electrode; a light scattering plate disposed between said clear plate and back plate; means for connecting said clear plate and back plate and for sealing to prevent flow-out of the electrolyte filled between said clear plate and back plate; and means for applying said first and second electric potentials between the display and counter electrodes for causing reversible oxidation and reduction reactions on the electrodes, said first electric potential being substantially constant to cause a stable display to appear on the display electrode which display is maintained even after removal of said first electric potential, said second electric potential being applied to cause the display to disappear.
Claim 69
Dependent Claim
16 words
The electrochromic display device according to claim 54, wherein said display electrode is seven-segments type display.
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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) | 1985-09-06 | 1986-03-08 | 1986-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-06 | 1990-03-08 | 1990-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-06 | 1994-03-08 | 1994-09-07 | $7700.00 | Window Closed / Lapsed |