US4235528A
Expired / Lapsed
US
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Ceramics for electrochromic display
Assignee: Sharp Corp
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Filing: 1979-04-23
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Granted: 1980-11-25
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Expires: 1999-04-23
Abstract
Abstract An electrochromic display comprising a display electrode and a counter electrode which form a cavity therebetween like a sandwich, the former consisting of a transparent conductive coating and a layer of transition metal oxide which varies reversibly in the light absorption spectrum upon application of current and the latter consisting of a conductive coating and a reversible charge exchange system. An electrolyte is injected into the cavity. A porous ceramics plate is positioned in contact with the display electrode and the counter electrode. This application is a continuation of copending application Ser. No. 760,521, filed on Jan. 19, 1977, now abandoned.
Inventors
- 👤 Kohzo Yano
- 👤 Hiroshi Kuwagaki
- 👤 Hiroshi Hamada
- 👤 Sadatoshi Takechi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:09
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1523; G02F1/1525
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
71 words
An electrochromic display cell comprising: a pair of electrodes, a layer of electrochromic material disposed between the pair of electrodes, and a sintered porous ceramic material impregnated with an electrolyte and disposed between the pair of electrodes and located in the background of a visual display on the layer of the electrochomic material, said sintered porous ceramic material having a color effective as a display background material in the display cell.
Claim 2
Dependent Claim
71 words
An electrochromic display cell comprising: a pair of electrodes, a layer of electrochromic material disposed between the pair of electrodes, and a sintered porous ceramic material impregnated with an electrolyte and disposed between the pair of electrodes and located in the background of a visual display on the layer of the electrochomic material, said sintered porous ceramic material having a color effective as a display background material in the display cell.
Claim 3
Dependent Claim
26 words
An electrochromic display cell as defined in claim 1 wherein the sintered porous ceramic material is selected from the group consisting of Cordierite, Mulite and alumina.
Claim 4
Dependent Claim
24 words
An electrochromic display cell as defined in claim 1, wherein the sintered porous ceramic material has a ratio of porosity of 30% to 50%.
Claim 5
Dependent Claim
91 words
An electrochromic display cell comprising: a pair of electrodes, a layer of electrochromic material disposed between the pair of electrodes, a sintered porous ceramic material impregnated with an electrolyte and disposed between the pair of electrodes and located in the background of a visual display on the layer of the electrochromic material, said sintered porous ceramic material having a color effective as a display background material in the display cell and a thickness sufficient to provide mechanical strength to the display cell so as to protect the display cell from damage.
Claim 6
Dependent Claim
91 words
An electrochromic display cell comprising: a pair of electrodes, a layer of electrochromic material disposed between the pair of electrodes, a sintered porous ceramic material impregnated with an electrolyte and disposed between the pair of electrodes and located in the background of a visual display on the layer of the electrochromic material, said sintered porous ceramic material having a color effective as a display background material in the display cell and a thickness sufficient to provide mechanical strength to the display cell so as to protect the display cell from damage.
Claim 7
Dependent Claim
26 words
An electrochromic display cell as defined in claim 4, wherein the sintered porous ceramic material is selected from the group consisting of Cordierite, Mulite and alumina.
Claim 8
Dependent Claim
26 words
An electrochromic display cell as defined in claim 4, wherein the thickness of the sintered porous ceramic material is about 1 mm to about 0.1 mm.
Claim 9
Dependent Claim
24 words
An electrochromic display cell as defined in claim 4, wherein the sintered porous ceramic material has a ratio of porosity of 30% to 50%.
Claim 10
Dependent Claim
86 words
An electrochromic display cell comprising: a pair of electrodes, a layer of electrochromic material disposed between the pair of electrodes, and a sintered porous ceramic material impregnated with an electrolyte and disposed between the pair of electrodes and located in the background of a visual display on the layer of the electrochromic material, said sintered porous ceramic material having a color effective as a display background in the display cell and having a coefficient of thermal expansion sufficient to absorb the cubic expansion of said electrolyte.
Claim 11
Dependent Claim
86 words
An electrochromic display cell comprising: a pair of electrodes, a layer of electrochromic material disposed between the pair of electrodes, and a sintered porous ceramic material impregnated with an electrolyte and disposed between the pair of electrodes and located in the background of a visual display on the layer of the electrochromic material, said sintered porous ceramic material having a color effective as a display background in the display cell and having a coefficient of thermal expansion sufficient to absorb the cubic expansion of said electrolyte.
Claim 12
Dependent Claim
26 words
An electrochromic display cell as defined in claim 8, wherein the sintered porous ceramic material is selected from the group consisting of Cordierite, Mulite and alumina.
Claim 13
Dependent Claim
26 words
An electrochromic display cell as defined in claim 8, wherein the thickness of the sintered porous ceramic material is about 1 mm to about 0.1 mm.
Claim 14
Dependent Claim
24 words
An electrochromic display cell as defined in claim 8, wherein the sintered porous ceramic material has a ratio of porosity of 30% to 50%.
Claim 15
Dependent Claim
140 words
An electrochromic display cell comprising a first substrate carrying a patterned, transparent, electrically conductive coating and a layer of electrochromic material forming a display electrode, a second substrate carrying an electrically conductive coating and a layer of electrochromic material forming a counter electrode, said display electrode and said counter electrode defining a cavity therebetween; and a sintered porous ceramic material impregnated with a desired amount of an electrolyte and disposed in said cavity between said electrodes and located in the background of a visual display on the layer of electrochromic material, said sintered porous ceramic material functioning to absorb the cubic expansion of the electrolyte, having a thickness sufficient to provide mechanical strength to the display cell so as to protect the display cell from damage and having a color effective as a display background material on the display cell.
Claim 16
Dependent Claim
140 words
An electrochromic display cell comprising a first substrate carrying a patterned, transparent, electrically conductive coating and a layer of electrochromic material forming a display electrode, a second substrate carrying an electrically conductive coating and a layer of electrochromic material forming a counter electrode, said display electrode and said counter electrode defining a cavity therebetween; and a sintered porous ceramic material impregnated with a desired amount of an electrolyte and disposed in said cavity between said electrodes and located in the background of a visual display on the layer of electrochromic material, said sintered porous ceramic material functioning to absorb the cubic expansion of the electrolyte, having a thickness sufficient to provide mechanical strength to the display cell so as to protect the display cell from damage and having a color effective as a display background material on the display cell.
Claim 17
Dependent Claim
16 words
The electrochromic display cell of claim 12, wherein the first and second substrates are glass substrates.
Claim 18
Dependent Claim
26 words
An electrochromic display cell as defined in claim 12, wherein the sintered porous ceramic material is selected from the group consisting of Cordierite, Mulite and alumina.
Claim 19
Dependent Claim
26 words
An electrochromic display cell as defined in claim 12, wherein the thickness of the sintered porous ceramic material is about 1 mm to about 0.1 mm.
Claim 20
Dependent Claim
24 words
An electrochromic display cell as defined in claim 12, wherein the sintered porous ceramic material has a ratio of porosity of 30% to 50%.
Claim 21
Dependent Claim
37 words
The electrochromic display cell of claim 13, wherein the electrically conductive coating on the first substrate is selected from the group consisting of SnO 2 doped In 2 O 3 and AsCl 5 doped SnCl 4 .
Claim 22
Dependent Claim
19 words
The electrochromic display cell of claim 17, wherein the electrochromic layer on the first substrate is WO 3 .
Claim 23
Dependent Claim
41 words
The electrochromic display cell of claim 18, wherein the electrically conductive coating on the second substrate is selected from the group consisting of a Pt-Pd deposited film, a carbon film, an In 2 O 3 film, and an SnO 2 film.
Claim 24
Dependent Claim
19 words
The electrochromic display cell of claim 12, wherein the electrochromic layer on the second substrate is WO 3 .
Claim 25
Dependent Claim
21 words
The electrochromic display cell of claim 12, wherein the porous ceramic material has the same thickness as that of the cavity.
References Cited (Backward Citations)
US3892472A
Cited
US4021100A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |