US4294520A
Expired / Lapsed
US
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Electrochromic display device
Assignee: Fujifilm Holdings Corp
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Filing: 1979-09-06
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Granted: 1981-10-13
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Expires: 1999-09-06
Abstract
Abstract An electrochromic display device with an improved current efficiency as well as with an extensive memory capability is disclosed; the device comprises a vapor deposited layer of an electrochromic material and a contiguous layer comprising chromium (III) oxide and the oxide of a transition metal or silicon also formed by vapor deposition. These two layers are sandwiched between a pair of electrodes at least one of which is light-transmitting.
Inventors
- 👤 Eiichi Inoue
- 👤 Isamu Shimizu
- 👤 Makoto Shizukuishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:17
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1523; G02F1/1525; G02F1/1524
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
79 words
An electrochromic display device comprising a transparent electrode, a laminate structure provided on said electrode comprising a vapor deposited layer of an electrochromic substance and a second vapor deposited mixed layer of chromium (III) oxide and an oxide selected from the group consisting of a transition metal oxide and silicon oxide and a counter electrode provided on said laminated structure wherein said oxide is present in an amount of 5 to 80% of said second vapor deposited mixed layer.
Claim 2
Dependent Claim
79 words
An electrochromic display device comprising a transparent electrode, a laminate structure provided on said electrode comprising a vapor deposited layer of an electrochromic substance and a second vapor deposited mixed layer of chromium (III) oxide and an oxide selected from the group consisting of a transition metal oxide and silicon oxide and a counter electrode provided on said laminated structure wherein said oxide is present in an amount of 5 to 80% of said second vapor deposited mixed layer.
Claim 3
Dependent Claim
22 words
The display device of claim 1, wherein said transparent electrode comprises a transparent support having deposited thereon an electrically conductive transparent coating.
Claim 4
Dependent Claim
30 words
The display device of claim 2, wherein said electrically conductive transparent coating is comprised of a material selected from the group consisting of indium oxide, tin oxide, and copper iodide.
Claim 5
Dependent Claim
18 words
The display device of claim 1, wherein said electrochromic substance is tungsten trioxide, molybdenum trioxide, or mixtures thereof.
Claim 6
Dependent Claim
25 words
The display device of claim 1, wherein said second vapor deposited mixed layer is a layer of chromium (III) oxide and a transition metal oxide.
Claim 7
Dependent Claim
23 words
The display device of claim 1, wherein said second vapor deposited mixed layer is a layer of chromium (III) oxide and silicon oxide.
Claim 8
Dependent Claim
41 words
The display device as claimed in claim 5, wherein said transition metal oxide is selected from the group consisting of V 2 O 5 , TiO 2 , ZrO 2 , Nb 2 O 5 and Ta 2 O 5 .
Claim 9
Dependent Claim
17 words
The display device of claim 7, wherein said transition metal oxide is vanadium oxide or titanium dioxide.
Claim 10
Dependent Claim
17 words
The display device of claim 8, wherein said transition metal oxide is V 2 O 5 .
Claim 11
Dependent Claim
25 words
The display device of claim 9, wherein said the weight ratio of chromium (III) oxide to V 2 O 5 is about 1:1 to 1:0.3.
Claim 12
Dependent Claim
12 words
The display device of claim 1, wherein said counter electrode is gold.
Claim 13
Dependent Claim
31 words
The display device as claimed in claim 6, wherein said silicon oxide is present in an amount of about 10% by weight or less of said second vapor deposited mixed layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-12 | 1985-04-13 | 1985-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-12 | 1989-04-13 | 1989-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-12 | 1993-04-13 | 1993-10-13 | $7700.00 | Window Closed / Lapsed |