US4508430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochromic display cell I
Assignee: Siemens AG
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Filing: 1982-09-21
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Granted: 1985-04-02
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Expires: 2002-09-21
Abstract
Abstract An electrochromic display cell is described which has a front electrode of tungsten trioxide layered on a support surface and a rear electrode of titanium nitride layered on a support surface. The rest potential and large capacity of the rear electrode permit a fast image cycle time at the front electrode and obviate the need to reverse potential polarity during cycling.
Inventors
- 👤 Helmut Freller
- 👤 Friedrich Horauf
- 👤 Hans-Peter Lorenz
- 👤 Konrad Mund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:30
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1523; G02F1/1524
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
44 words
An electrochromic display cell comprising a front electrode having a tungsten trioxide layer and an outer support surface, a rear electrode having a porous titanium nitride layer and an outer support surface, and an electrolyte contacting the tungsten trioxide and porous titanium nitride layers.
Claim 2
Dependent Claim
44 words
An electrochromic display cell comprising a front electrode having a tungsten trioxide layer and an outer support surface, a rear electrode having a porous titanium nitride layer and an outer support surface, and an electrolyte contacting the tungsten trioxide and porous titanium nitride layers.
Claim 3
Dependent Claim
23 words
A cell according to claim 1 wherein the titanium nitride has the formula TiN x wherein x is selected from 0.6 to 1.4.
Claim 4
Dependent Claim
14 words
A cell according to claim 2 wherein the titanium nitride has the formula TiN.
Claim 5
Dependent Claim
22 words
A cell according to claim 1 wherein the density of the titanium nitride is from about 2 to 3 g per cc.
Claim 6
Dependent Claim
18 words
A cell according to claim 1 wherein the density of the titanium nitride is 2.5 g per cc.
Claim 7
Dependent Claim
66 words
An electrochromic display cell comprising a front electrode having a tungsten trioxide layer and an outer support surface; a rear electrode having an outer support surface and an inner double layer of titanium nitride, the layer contacting the outer support surface being dense and the inner layer facing the tungsten trioxide layer being porous; and an electrolyte contacting the tungsten trioxide and porous titanium nitride layers.
Claim 8
Dependent Claim
66 words
An electrochromic display cell comprising a front electrode having a tungsten trioxide layer and an outer support surface; a rear electrode having an outer support surface and an inner double layer of titanium nitride, the layer contacting the outer support surface being dense and the inner layer facing the tungsten trioxide layer being porous; and an electrolyte contacting the tungsten trioxide and porous titanium nitride layers.
Claim 9
Dependent Claim
36 words
A cell according to claim 6 wherein the dense layer has a density of about 5 g per cc and the porous inner layer has a density of from about 2 to 3 g per cc.
Claim 10
Dependent Claim
19 words
A cell according to claim 6 wherein the porous inner layer has a density of 2.5 g per cc.
Claim 11
Dependent Claim
29 words
A cell according to claim 1 or 6 which further comprises a layer of metallic titanium interspaced between and contacting the outer support surface and the titanium nitride layer.
Claim 12
Dependent Claim
32 words
A cell according to claim 1, or 6 wherein the outer support surface of the front electrode is glass and the outer support surface of the rear electrode is metal or glass.
Claim 13
Dependent Claim
22 words
A cell according to claim 1, or 6 wherein the titanium nitride layer is from about 2 to about 40 microns thick.
Claim 14
Dependent Claim
17 words
A cell according to claim 1, or 6 wherein the titanium nitride layer is 15 microns thick.
Claim 15
Dependent Claim
24 words
A cell according to claim 1, or 6 wherein the tungsten trioxide layer comprises electrically distinct, individual segments, each having its own electrical contact.
Claim 16
Dependent Claim
18 words
A cell according to claim 13 wherein the segments are spatially arranged as a multiply indicating alphanumeric character.
Claim 17
Dependent Claim
28 words
A cell according to claim 1 or 6 which further comprises a contact layer of indium oxide interspaced between the tungsten trioxide layer and the outer support surface.
Claim 18
Dependent Claim
21 words
A cell according to claim 1 or 6 wherein the electrolyte is an inert organic compound containing an ionic inorganic salt.
Claim 19
Dependent Claim
17 words
A cell according to claim 16 wherein the salt is an alkali or alkaline earth metal salt.
Claim 20
Dependent Claim
12 words
A cell according to claim 17 wherein the salt is lithium perchlorate.
Claim 21
Dependent Claim
12 words
A cell according to claim 16 wherein the compound is propylene carbonate.
References Cited (Backward Citations)
DE3011506A1
Cited
US4279726A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-01 | 1988-10-01 | 1989-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-01 | 1992-10-01 | 1993-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-01 | 1996-10-01 | 1997-04-02 | $7700.00 | Window Closed / Lapsed |