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US4773740A
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Electrochromic display device
Assignee: Maxell Ltd
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Filing: 1987-10-21
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Granted: 1988-09-27
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Expires: 2007-10-21
Abstract
Abstract An electrochromic display device which comprises a display electrode comprising a transparent substrate, a transparent electrode formed on an inner surface of the transparent substrate and an electrochromic material layer for display made of tungsten oxide and formed on the transparent electrode; a counter electrode comprising a substrate, a conductive layer formed on an inner surface of the substrate and an activated carbon fiber material; and a spacer provided between the display electrode and the counter electrode with their inner surfaces facing each other to define, between them, an electrolyte chamber, which is filled with an electrolyte comprising a lithium salt and at least one of the tertiary alkyl ammonium salts and quarternary alkyl ammonium slats dissolved in a non-aqueous medium containing a small amount of water, which device has increased original injected charge which can last for a long time.
Inventors
- 👤 Akira Kawakami
- 👤 Toshikatsu Manabe
- 👤 Tsunemi Ohiwa
- 👤 Shuichi Wada
- 👤 Kenichi Yokoyama
- 👤 Saburo Nonogaki
- 👤 Kazusuke Yamanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:11
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1523; G02F1/1525
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
124 words
An electrochromic display device which comprises: a display electrode comprising, a transparent electrode formed on an inner surface of the transparent substrate, and an electrochromic material layer for display made of tungsten oxide and formed on the transparent electrode; and a counter electrode comprising, a substrate, a conductive layer formed on an inner surface of the substrate, and an activated carbon fiber material; and a spacer provided between the display electrode and the counter electrode with their inner surfaces facing each other to define, between them, an electrolyte chamber, which is filled with an electrolyte comprising a lithium salt and at least one of tertiary alkyl ammonium salts and quarternary alkyl ammonium salts dissolved in a non-aqueous medium containing a small amount of water.
Claim 2
Dependent Claim
124 words
An electrochromic display device which comprises: a display electrode comprising, a transparent electrode formed on an inner surface of the transparent substrate, and an electrochromic material layer for display made of tungsten oxide and formed on the transparent electrode; and a counter electrode comprising, a substrate, a conductive layer formed on an inner surface of the substrate, and an activated carbon fiber material; and a spacer provided between the display electrode and the counter electrode with their inner surfaces facing each other to define, between them, an electrolyte chamber, which is filled with an electrolyte comprising a lithium salt and at least one of tertiary alkyl ammonium salts and quarternary alkyl ammonium salts dissolved in a non-aqueous medium containing a small amount of water.
Claim 3
Dependent Claim
29 words
The electrochromic display device according to claim 1, wherein the lithium salt is one selected from the group consisting of LiClO 4 , LiBF 4 and LiPF 6 .
Claim 4
Dependent Claim
16 words
The electrochromic display device according to claim 2, wherein the lithium salt is LiClO 4 .
Claim 5
Dependent Claim
54 words
The electrochromic display device according to claim 1, wherein the alkyl ammonium salt is at least one selected from the group consisting of (CH 3 ) 3 NHClO 4 , (C 2 H 5 ) 3 NHClO 4 , (C 3 H 7 ) 3 (C 3 H 7 ) 4 NClO 4 .
Claim 6
Dependent Claim
35 words
The electrochromic display device according to claim 1, wherein the total amount of the lithium salt and the tertiary or quarternary alkyl ammonium compound is 0.3 to 1.5 moles per liter of the non-aqueous medium.
Claim 7
Dependent Claim
38 words
The electrochromic display device according to claim 1, wherein the amount of the lithium salt is 30 to 90% by mole based on the total amount of the lithium salt and the tertiary or quarternary alkyl ammonium compound.
Claim 8
Dependent Claim
27 words
The electrochromic display device according to claim 1, wherein the amount of water is 1% by weight or less based on the weight of the non-aqueous medium.
References Cited (Backward Citations)
US4249013A
Cited
US4399436A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-27 | 1992-03-28 | 1992-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-27 | 1996-03-28 | 1996-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-27 | 2000-03-28 | 2000-09-27 | $7700.00 | Window Closed / Lapsed |