US4957352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochromic display device
Assignee: Sony Corp
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Filing: 1988-07-27
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Granted: 1990-09-18
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Expires: 2008-07-27
Abstract
Abstract An electrochromic display is disclosed, in which an electrochromic material layer is disposed between a pair of plates each having an array of electrodes. The electrochromic material layer is composed of leuco dyes, supporting electrolyte and binder. The leuco dyes can be colored and discolored upon application of current thereto in a liquefied state of the material layer. Melting the material layer and application of current are carried out by the array of the electrodes.
Inventors
- 👤 Akio Yasuda
- 👤 Kengo Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:20
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/163; G02F1/1503
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
84 words
An electrochromic display comprising an electrochromic material layer provided between a pair of plates, at least one of said plates being transparent, said electrochromic material layer composed of a coloring compound and a supporting electrolyte means for heating said electrochromic material layer to liquefy said electrochromic material layer to convert the layer into electrical conduction and means for applying a current to said material layer to cause oxidation and/or reduction reaction of said coloring compound when the electrochromatic layer is in a liquified condition.
Claim 2
Dependent Claim
84 words
An electrochromic display comprising an electrochromic material layer provided between a pair of plates, at least one of said plates being transparent, said electrochromic material layer composed of a coloring compound and a supporting electrolyte means for heating said electrochromic material layer to liquefy said electrochromic material layer to convert the layer into electrical conduction and means for applying a current to said material layer to cause oxidation and/or reduction reaction of said coloring compound when the electrochromatic layer is in a liquified condition.
Claim 3
Dependent Claim
22 words
An electrochromic display according to claim 1, said means for heating said electrochromic material layer is an electrode applied with a.c. current.
Claim 4
Dependent Claim
23 words
An electrochromic display according to claim 1, said means for applying a current is an array of electrodes which contact said electrochromic material.
Claim 5
Dependent Claim
28 words
An electrochromic display according to claim 1, said coloring compound is selected from at least one of leuco dyes, triphenylemethane phthalides, fluorans, thiofluorans, indoleyl phthalides, rhodamine lactums, azaphthalides.
Claim 6
Dependent Claim
19 words
An electrochromic display according to claim 1, said coloring compound is leuco dye which has a lactone ring therein.
Claim 7
Dependent Claim
19 words
An electrochromic display according to claim 1, said means for applying a current is an array of switching transistors.
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) | 1993-09-17 | 1994-03-19 | 1994-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-17 | 1998-03-19 | 1998-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-17 | 2002-03-19 | 2002-09-18 | $7700.00 | Window Closed / Lapsed |