US3569614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal color modulator for electronic imaging systems
Assignee: Individual
•
Filing: 1969-04-10
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Granted: 1971-03-09
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Expires: 1989-04-10
Abstract
Abstract This invention utilizes the principle that a nematic liquid crystal, which is normally clear and transparent, is darkened upon application of a voltage thereto and can be darkened sufficiently to prevent light from passing therethrough. In a three color system, the instant color modulator blocks out two unselected colors by applying voltage to the liquid crystal behind the unselected color filters thus permitting the selected color to pass through the transparent liquid crystal behind its filter.
Inventors
- 👤 Thomas F Hanlon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:26
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133509; G02F1/133514; H04N3/00; H04N3/10; H04N3/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
23 words
A liquid crystal color modulator according to claim 1, wherein said three different colors consist of the additive colors red, blue and green.
Claim 2
Dependent Claim
23 words
A liquid crystal color modulator according to claim 1, wherein said three different colors consist of the subtractive colors cyan, yellow and magenta.
Claim 3
Dependent Claim
27 words
A liquid crystal color modulator according to claim 1, wherein said other side of said one of said plates is positioned facing toward said source of light.
Claim 4
Dependent Claim
18 words
A liquid crystal color modulator according to claim 1, said one of said plates comprising said second plate.
Claim 5
Dependent Claim
229 words
A liquid crystal modulator for electronic imaging systems in the form of a sandwichlike structure composed of a first transparent electrode plate having on one side thereof a continuous uninterrupted electrode, a second transparent electrode plate having on one side thereof a multiplicity of closely spaced horizontal electrode stripes, said plates being positioned closely spaced from each other with the electrode bearing sides thereof facing toward each other, the space between said plates being filled with a nematic liquid crystal, light obstructing means on either of said plates positioned in the horizontal planes of the spaces between said electrode stripes, branch leads connecting a first group of said electrode stripes comprising the first, fourth, seventh etc. electrode stripes to a first common lead, branch leads connecting a second group of said electrode stripes comprising the second, fifth, eighth etc. electrode stripes to a second common lead, branch leads connecting a third group of said electrode stripes comprising the third, sixth, ninth etc. electrode stripes to a third common lead, and a lead extending from said continuous electrode, whereby when voltages are applied sequentially between said last-named lead and three different pairs of said common leads the liquid crystal in the horizontal planes of two of said three groups are sequentially darkened while leaving transparent the liquid crystal in the horizontal planes of the remaining one of said three groups.
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |