US4019809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochromic display device
Assignee: Suwa Seikosha KK
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Filing: 1975-06-25
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Granted: 1977-04-26
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Expires: 1995-06-25
Abstract
Abstract A display device includes a layer of photoconductive material and a layer of electrochromic material between electrodes. The device is useful as an image converter for the spectrum from X-rays to infra-red and as a memory device.
Inventors
- 👤 Tsutomu Otake
- 👤 Hiroshi Takeshita
- 👤 Akihiko Kouchi
- 👤 Kunihiro Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:26
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/153; G02F1/157; G02F1/1503
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
128 words
A display device useful as an image converter over the range from X-rays to infra-red and a a memory -- non-memory device, comprising in spatial sequence, a first transparent substrate a transparent first electrode supported on said first transparent substrate, a layer of photoconductive material, a layer of insulating material having a multiplicity of openings therethrough, said opening having a maximum diameter of 5 mm and being arranged to produce a halftone effect, a second electrode, and a second transparent substrate, said second electrode being supported on said second transparent substrate and said openings containing electrochromic material making conductive paths between said layer of photoconductive material and said second electrode, said electrochromic material being viologen bromide and said insulating material being between 10 and 1 mm. in thickness.
Claim 2
Dependent Claim
128 words
A display device useful as an image converter over the range from X-rays to infra-red and a a memory -- non-memory device, comprising in spatial sequence, a first transparent substrate a transparent first electrode supported on said first transparent substrate, a layer of photoconductive material, a layer of insulating material having a multiplicity of openings therethrough, said opening having a maximum diameter of 5 mm and being arranged to produce a halftone effect, a second electrode, and a second transparent substrate, said second electrode being supported on said second transparent substrate and said openings containing electrochromic material making conductive paths between said layer of photoconductive material and said second electrode, said electrochromic material being viologen bromide and said insulating material being between 10 and 1 mm. in thickness.
Claim 3
Dependent Claim
28 words
The display device as defined in claim 1, wherein said viologen bromide is dissolved in a member of the group consisting of water, ethyl alcohol and methyl alcohol.
Claim 4
Dependent Claim
25 words
The display device as defined in claim 1, wherein said electrochromic material is present as a solution at a concentration between 0.01 mol/1 and saturation.
Claim 5
Dependent Claim
22 words
The display device as defined in claim 3, wherein the concentration of said electrochromic material in said solution is about 0.1 mol/1.
Claim 6
Dependent Claim
20 words
The display device as defined in claim 1, wherein the thickness of said electrochromic material is from 100μ to 300μ.
Claim 7
Dependent Claim
20 words
The display device as defined in claim 1, wherein the thickness of said photoconductive layer is from 0.5μ to 10μ.
Claim 8
Dependent Claim
52 words
The display device as defined in claim 1, wherein said photoconductive layer is of a member of the group consisting of PbO, which is sensitive to X-rays, PbS, PbSe, and Cd x Hg 1 -x Te, which are sensitive to infra-red rays, and ZnS and ZnO which are sensitive to ultraviolet rays.
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) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |