US4019808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for a polychrome display
Assignee: Fraunhofer-Gesellschaft zur Förderung der Angewandten Forschung eV
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Filing: 1976-05-05
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Granted: 1977-04-26
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Expires: 1996-05-05
Abstract
Abstract An arrangement for a polychrome display comprises in serial association a ght 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 James Scheffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:15
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: 12
Claim 1
Independent Claim
65 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, and a pleochroic color selective linear polarizer forming an assembly.
Claim 2
Dependent Claim
65 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, and a pleochroic color selective linear polarizer forming an assembly.
Claim 3
Dependent Claim
25 words
An arrangement set forth in claim 1, wherein said pleochroic color selective linear polarizer is in the form of a foil embedding pleochroic dye particles.
Claim 4
Dependent Claim
22 words
An arrangement as set forth in claim 1, wherein said pleochroic color selective polarizer consists of two foils incorporating different pleochroic dyes.
Claim 5
Dependent Claim
35 words
An arrangement as set forth in claim 1, comprising at least two of said electro-optical rotating elements and pleochroic color selective linear polarizers in series for the purpose of increasing the possible number of colors.
Claim 6
Dependent Claim
38 words
An arrangement as set forth in claim 4, wherein a polished reflecting mirror is provided on the exit side of the final pleochroic color selective linear polarizer to permit the arrangement to be operated by reflected ambient light.
Claim 7
Dependent Claim
24 words
An arrangement as set forth in claim 5, wherein the mirror also diffuses the light for the purpose of widening the angle of observation.
Claim 8
Dependent Claim
40 words
An arrangement set forth in claim 1, further comprising a light diffusing element adjacent the side of said pleochroic color selective linear polarizer opposite said electro-optical nematic liquid crystal rotating element for the purpose of widening the angle of observation.
Claim 9
Dependent Claim
42 words
An arrangement as set forth in claim 1, further comprising optical imaging means adjacent the side of said pleochroic color selective linear polarizer opposite said electro-optical nematic liquid crystal rotating element for the purpose of projecting the transmitted colors on a screen.
Claim 10
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 11
Dependent Claim
18 words
An arrangement as set forth in claim 1, wherein the light source is arranged to emit colored light.
Claim 12
Dependent Claim
19 words
An arrangement as set forth in claim 1, wherein a passive optical color filter precedes the first polarizing filter.
References Cited (Backward Citations)
US3731986A
Cited
US3806227A
Cited
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 |