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US4411497A
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Electrochromic display element
Assignee: Hitachi Ltd
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Filing: 1981-02-11
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Granted: 1983-10-25
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Expires: 2001-02-11
Abstract
Abstract Disclosed is an electrochromic display element having a counter electrode comprised of a sintered material prepared by sintering an atomized material comprising as main components a powder of Sn[Fe(CN) 6 ], MnK[Fe(CN) 6 ], NiK[Fe(CN) 6 ], amorphous Fe 2 (WO 4 ) 3 , amorphous FeWO 4 , amorphous Mn 2 (WO 4 ) 3 or amorphous MnWO 4 and a powder of carbon. This electrochromic display element is characterized in that no substantial non-uniform brightness is observed among colored segments.
Inventors
- 👤 Kazusuke Yamanaka
- 👤 Shouji Mochizuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:14
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1523; G02F1/1524
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
93 words
An electrochromic display element comprising a display electrode, a counter electrode and a liquid electrolyte disposed intermediately between said display electrode and said counter electrode, wherein the counter electrode is comprised of a sintered material formed by sintering an atomized material comprising a powder of carbon and a powder of one compound selected from the group consisting of Sn(Fe(CN) 6 ), MnK(Fe(CN) 6 ), NiK(Fe(CN) 6 ), amorphous Fe 2 (WO 4 ) x , where 2.5<x≦3.0, amorphous FeWO 4 , amorphous Mn 2 (WO) 4 ) 3 and amorphous MnWO 4 .
Claim 2
Dependent Claim
93 words
An electrochromic display element comprising a display electrode, a counter electrode and a liquid electrolyte disposed intermediately between said display electrode and said counter electrode, wherein the counter electrode is comprised of a sintered material formed by sintering an atomized material comprising a powder of carbon and a powder of one compound selected from the group consisting of Sn(Fe(CN) 6 ), MnK(Fe(CN) 6 ), NiK(Fe(CN) 6 ), amorphous Fe 2 (WO 4 ) x , where 2.5<x≦3.0, amorphous FeWO 4 , amorphous Mn 2 (WO) 4 ) 3 and amorphous MnWO 4 .
Claim 3
Dependent Claim
18 words
An electrochromic display element as set forth in claim 1, wherein the atomized material further comprises a binder.
Claim 4
Dependent Claim
22 words
An electrochromic display element as set forth in claim 1, wherein the thickness of the sintered material is 5 to 1000 μm.
Claim 5
Dependent Claim
22 words
An electrochromic display element as set forth in claim 1, wherein the thickness of the sintered material is 50 to 100 μm.
Claim 6
Dependent Claim
26 words
An electrochromic display element as set forth in claim 1, wherein the atomized material is coated on a conductive film on a back substrate and sintered.
Claim 7
Dependent Claim
40 words
An electrochromic display element as set forth in any of claims 1 through 5, wherein said compound is a member selected from the group consisting of amorphous Fe 2 (WO 4 ) x and amorphous FeWO 4 , where 2.5<x≦3.
Claim 8
Dependent Claim
35 words
An electrochromic display element as set forth in claim 6, wherein said compound is iron tungstate synthesized by mixing an aqueous solution of a water-soluble tungstate with an aqueous solution of a water-soluble iron salt.
Claim 9
Dependent Claim
53 words
An electrochromic display element as set forth in claim 7, wherein said water-soluble tungstate is a member selected from the group consisting of potassium tungstate and sodium tungstate and said water-soluble iron salt is a member selected from the group consisting of ferrous chloride, ferric chloride, ferrous sulfate, ferrous nitrate and ferric nitrate.
Claim 10
Dependent Claim
38 words
An electrochromic display element as set forth in any of claims 1 through 5, wherein said compound is a member selected from the group consisting of amorphous Mn 2 (WO 4 ) 3 and amorphous MnWO 4 .
Claim 11
Dependent Claim
35 words
An electrochromic display element as set forth in claim 9, wherein said compound is manganese tungstate synthesized by mixing an aqueous solution of a water-soluble tungstate with an aqueous solution of a water-soluble manganese salt.
Claim 12
Dependent Claim
47 words
An electrochromic display element as set forth in claim 10, wherein said water-soluble tungstate is a member selected from the group consisting of potassium tungstate and sodium tungstate and said water-soluble manganese salt is a member selected from the group consisting of manganese sulfate and manganese chloride.
Claim 13
Dependent Claim
21 words
An electrochromic display element as set forth in any of claims 1 through 5, wherein said compound is Sn(Fe(CN) 6 ).
Claim 14
Dependent Claim
44 words
An electrochromic display element as set forth in claim 12, wherein said compound is Sn(Fe(CN) 6 ) synthesized by mixing an aqueous solution of a member selected from the group consisting of potassium ferricyanide and potassium ferrocyanide with an aqueous solution of stannous chloride.
Claim 15
Dependent Claim
33 words
An electrochromic display element as set forth in claim 12, wherein said compound is Sn(Fe(CN) 6 ) synthesized by mixing an aqueous solution of potassium ferrocyanide with an aqueous solution of stannic chloride.
Claim 16
Dependent Claim
21 words
An electrochromic display element as set forth in any of claims 1 through 5, wherein said compound is MnK(Fe(CN) 6 ).
Claim 17
Dependent Claim
44 words
An electrochromic display element as set forth in claim 15, wherein said compound is MnK(Fe(CN) 6 ) synthesized by mixing an aqueous solution of a member selected from the group consisting of potassium ferricyanide and potassium ferrocyanide with an aqueous solution of manganic chloride.
Claim 18
Dependent Claim
33 words
An electrochromic display element as set forth in claim 15, wherein said compound is MnK(Fe(CN) 6 ) synthesized by mixing an aqueous solution of potassium ferricyanide with an aqueous solution of manganous chloride.
Claim 19
Dependent Claim
21 words
An electrochromic display element as set forth in any of claims 1 through 5, wherein said compound is NiK(Fe(CN) 6 ).
Claim 20
Dependent Claim
44 words
An electrochromic display element as set forth in claim 18, wherein said compound is NiK(Fe(CN) 6 ) synthesized by mixing an aqueous solution of a member selected from the group consisting of nickel sulfate and nickel chloride with an aqueous solution of potassium ferricyanide.
Claim 21
Dependent Claim
22 words
An electrochromic display element as set forth in any of claims 1 through 5, wherein said one compound is a water-insoluble compound.
Claim 22
Dependent Claim
24 words
An electrochromic display element as set forth in claim 1, wherein the weight ratio of said one compound to carbon is 1:20 to 1:0.3.
Claim 23
Dependent Claim
29 words
An electrochromic display element as set forth in claim 2, wherein said binder is included in an amount of from 0.5-1.0% based on the weight of said one compound.
Claim 24
Dependent Claim
22 words
An electrochromic display element as set forth in claim 1, wherein said liquid electrolyte is a lithium salt in an organic solvent.
Claim 25
Dependent Claim
32 words
An electrochromic display element as set forth in claim 23, wherein said lithium salt is LiClO 4 , and said organic solvent is propylene carbonate, the solution having a concentration 1 mol/l.
References Cited (Backward Citations)
US4348077A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |