Patent US4239349A successfully refreshed from Google Patents.
US4239349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for a polychrome display
Assignee: Individual
•
Filing: 1974-06-07
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Granted: 1980-12-16
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Expires: 1994-06-07
Abstract
Abstract An arrangement for a polychrome display comprises in serial association a light source, a linear polarizing filter, at least one nematic liquid crystal rotating element, and either a passive birefringent retardation plate followed by a further neutral linear polarizing filter or a selective polarizer.
Inventors
- 👤 Terry J. Scheffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:48
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/139; G02F1/1396; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133528; G02F1/133533; G02F2203/00; G02F2203/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
70 words
An arrangement for a polychrome display, comprising in serial association a light source, a linear polarizing filter, at least one electro-optical nematic liquid crystal rotating element adapted to rotate the plane of polarization of a light ray when no electrical potential is applied and to leave the plane of polarization unchanged when potential is applied, a passive birefringent retardation plate and a further neutral linear polarizing filter forming an assembly.
Claim 2
Dependent Claim
70 words
An arrangement for a polychrome display, comprising in serial association a light source, a linear polarizing filter, at least one electro-optical nematic liquid crystal rotating element adapted to rotate the plane of polarization of a light ray when no electrical potential is applied and to leave the plane of polarization unchanged when potential is applied, a passive birefringent retardation plate and a further neutral linear polarizing filter forming an assembly.
Claim 3
Dependent Claim
44 words
An arrangement as set forth in claim 1, comprising the serial association of at least two of said assemblies each containing an electro-optical nematic liquid crystal rotating element, a retardation plate, and polarisation filters, for the purpose of increasing the number of colors producible.
Claim 4
Dependent Claim
40 words
An arrangement set forth in claim 1, further comprising a light diffusing element adjacent the side of said further neutral linear polarizing filter opposite said electro-optical nematic liquid crystal rotating element for the purpose of widening the angle of observation.
Claim 5
Dependent Claim
42 words
An arrangement as set forth in claim 1, further comprising optical imaging means adjacent the side of said further neutral linear polarizing filter opposite said electro-optical nematic liquid crystal rotating element for the purpose of projecting the transmitted colors on a screen.
Claim 6
Dependent Claim
21 words
An arrangement as set forth in claim 1, wherein the optical retardation plate is a birefringent film of a polymerised substance.
Claim 7
Dependent Claim
37 words
An arrangement as set forth in claim 1, wherein the electro-optical nematic liquid crystal rotating element comprises a pair of electrodes divided into segments to permit selected segments to be activated by the application thereto of potential.
Claim 8
Dependent Claim
18 words
An arrangement as set forth in claim 1, wherein the light source is arranged to emit colored light.
Claim 9
Dependent Claim
19 words
An arrangement as set forth in claim 1, wherein a passive optical color filter precedes the first polarising filter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |