US4043654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display system
Assignee: Xerox Corp
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Filing: 1973-04-09
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Granted: 1977-08-23
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Expires: 1993-04-09
Abstract
Abstract A display device which responds to a light image to form a viewable image. The system is sealed and is filled with a fluid carrying a dilute suspension of particles between electrodes. A photoconductive layer is used on one electrode. Imagewise illumination of the photoconductive layer and application of electrical field between the two electrodes causes particle migration in image configuration which forms a visible image. Using a dark suspension may increase viewability.
Inventors
- 👤 Morton Silverberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:08
CPC Classifications
G; G03; G03G; G03G17/00; G03G17/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
121 words
An electrophoretic light image display and/or recording device comprising an electrophoretic suspension layer inserted between two electrodes, one of which has a photoconductive layer coupled thereto and faced to said electrophoretic suspension layer means for applying an electric field between said two electrodes and means for irradiating light on said photoconductive layer so as to reduce the resistivity of said photoconductive layer, said electrophoretic suspension layer being selected from the group consisting of a suspension including at least one electrophoretic material suspended in a dark suspending medium the optical reflective property of said electrophoretic suspension layer being changeable with electrophoretic movement of said electrophoretic material upon application of said electric field during the reduction of the resistivity of said photoconductive layer.
Claim 2
Dependent Claim
121 words
An electrophoretic light image display and/or recording device comprising an electrophoretic suspension layer inserted between two electrodes, one of which has a photoconductive layer coupled thereto and faced to said electrophoretic suspension layer means for applying an electric field between said two electrodes and means for irradiating light on said photoconductive layer so as to reduce the resistivity of said photoconductive layer, said electrophoretic suspension layer being selected from the group consisting of a suspension including at least one electrophoretic material suspended in a dark suspending medium the optical reflective property of said electrophoretic suspension layer being changeable with electrophoretic movement of said electrophoretic material upon application of said electric field during the reduction of the resistivity of said photoconductive layer.
Claim 3
Dependent Claim
39 words
An electrophoretic light image display and/or recording device defined by claim 1 wherein said one of two electrodes is transparent with respect to said irradiated light and another of said two electrodes is transparent with respect to visible light.
Claim 4
Dependent Claim
39 words
An electrophoretic light image display and/or recording device defined by claim 1 wherein said one of two electrodes is transparent with respect to said irradiated light and visible light, said photoconductive layer is transparent with respect to visible light.
Claim 5
Dependent Claim
43 words
An electrophoretic light image display and/or recording device defined by claim 1, wherein said means for applying an electric field includes means for controlling said electric field with respect to at least one property selected from the group consisting of strength, and polarity.
Claim 6
Independent Claim
101 words
A system for image formation comprising: a pair of spaced electrically conductive plates at least one of which is transparent, means for supporting said conductive plates in said spaced relationship, means for circulating a fluid containing a suspension of electrically photosensitive particles between said plates, particle filtering means for removing at least part of the particles contained in the fluid suspension, means for applying an unidirectional electric field between said plates, and means for projecting a light image of an original upon said transparent plate, the particles contacting illuminated areas thereof migrating away from said first plate from said transparent plate.
Claim 7
Independent Claim
101 words
A system for image formation comprising: a pair of spaced electrically conductive plates at least one of which is transparent, means for supporting said conductive plates in said spaced relationship, means for circulating a fluid containing a suspension of electrically photosensitive particles between said plates, particle filtering means for removing at least part of the particles contained in the fluid suspension, means for applying an unidirectional electric field between said plates, and means for projecting a light image of an original upon said transparent plate, the particles contacting illuminated areas thereof migrating away from said first plate from said transparent plate.
Claim 8
Independent Claim
105 words
A system for image formation comprising: a support structure, first and second spaced transparent electrically conductive plates mounted within said support structure, a layer of transparent photoconductive material overlying said first transparent plate, means for applying an unidirectional electric field between said plates, means for circulating a fluid containing a suspension of charged particles between said plates, particle filter means for removing at least part of the particle contained in the fluid suspension, and means for projecting a light image of an original upon said first plate, causing the particles which contact illuminated areas of said photoconductive layer to migrate away from said first plate.
Claim 9
Independent Claim
105 words
A system for image formation comprising: a support structure, first and second spaced transparent electrically conductive plates mounted within said support structure, a layer of transparent photoconductive material overlying said first transparent plate, means for applying an unidirectional electric field between said plates, means for circulating a fluid containing a suspension of charged particles between said plates, particle filter means for removing at least part of the particle contained in the fluid suspension, and means for projecting a light image of an original upon said first plate, causing the particles which contact illuminated areas of said photoconductive layer to migrate away from said first plate.
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) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |