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US4346964A
Expired / Lapsed
US
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Electrochromic display device
Assignee: Seiko Instruments Inc
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Filing: 1980-04-25
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Granted: 1982-08-31
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Expires: 2000-04-25
Abstract
Abstract An electrochromic display device having a simplified driving circuit. A colored display is performed by injecting an electric charge into the electrochromic layers of predetermined segments. The electric charge is transferred to the electrochromic layers of the other segments by applying a DC electric field between the predetermined segments and other segments to thereby change the display state.
Inventors
- 👤 Satoshi Ishihama
- 👤 Taisuke Miyoshi
- 👤 Koji Iwasa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:49
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/163
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
87 words
In an electrochromic display device of the type having a plurality of electrode segments comprised of electrochromic material in contact with an electrolyte such that the electrode segments exhibit either colored or bleached states depending on the amount of electric charge held by the electrode segments: means for selectively applying a DC electric field between preselected bleached electrode segments and colored electrode segments effective to transfer electric charges between the preselected electrode segments through the electrolyte to thereby change the display state of the electrochromic display device.
Claim 2
Dependent Claim
87 words
In an electrochromic display device of the type having a plurality of electrode segments comprised of electrochromic material in contact with an electrolyte such that the electrode segments exhibit either colored or bleached states depending on the amount of electric charge held by the electrode segments: means for selectively applying a DC electric field between preselected bleached electrode segments and colored electrode segments effective to transfer electric charges between the preselected electrode segments through the electrolyte to thereby change the display state of the electrochromic display device.
Claim 3
Dependent Claim
34 words
An electrochromic display device according to claim 1; wherein each of the electrode segments has an area which is about an integer multiple of the area of the electrode segment having the smallest area.
Claim 4
Dependent Claim
42 words
An electrochromic display device according to claim 2; wherein some of the electrode segments comprise display segments disposed in a pattern to form a display, and others of the electrode segments comprise auxiliary segments which do not form part of the display.
Claim 5
Dependent Claim
18 words
An electrochromic display device according to claim 3; wherein the pattern of display segments comprises a numerical display.
Claim 6
Dependent Claim
28 words
An electrochromic display device according to any one of claims 1, 2, 3 or 4; wherein the electrode segments comprise layers of electrochromic material disposed on transparent electrodes.
Claim 7
Dependent Claim
21 words
An electrochromic display device according to any one of claims 1, 2, 3 or 4; wherein the electrolyte comprises a salt.
Claim 8
Dependent Claim
15 words
An electrochromic display device according to claim 6; wherein the electrolyte salt comprises lithium perchlorate.
Claim 9
Dependent Claim
18 words
An electrochromic display device according to claim 6; wherein the electrolyte sale comprises lithium perchlorate in propylene carbonate.
Claim 10
Dependent Claim
15 words
An electrochromic display device according to claim 5; wherein the transparent electrodes comprise tin oxide.
Claim 11
Dependent Claim
56 words
An electrochromic display device according to any one of claims 1, 2, 3 or 4; wherein the means for selectively applying a DC electric field comprises means for selectively applying a DC electric field of alternate polarity between groups of colored and bleached electrode segments to thereby change the display state of the electrochromic display device.
Claim 12
Dependent Claim
50 words
An electrochromic display device according to any one of claims 1, 2, 3 or 4; wherein the means for selectively applying a DC electric field comprises means for applying a DC electric field effective to maintain the charge density of the colored electrode segments at about 5 mC/cm 2 .
References Cited (Backward Citations)
JPS54123966A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |