US3650608A
Expired / Lapsed
US
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Method and apparatus for displaying coherent light images
Assignee: Texas Instruments Inc
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Filing: 1969-12-23
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Granted: 1972-03-21
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Expires: 1989-12-23
Abstract
Abstract A method and apparatus for destroying the scintillation or speckling effect observed when a bema of coherent light is impinged or directed upon a stationary screen includes a relatively thin layer of an organic nematic mesomorphic compound which is impressed with a voltage above the particular threshold electric field which causes the compound to scatter light.
Inventors
- 👤 Charles E Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:31
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/02; G; G02; G02B; G02B27/00; G02B27/48; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/1313; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
25 words
A method for producing a speckle-free image on a screen in accordance with claim 1, wherein said liquid crystal is an organic nematic mesomorphic compound.
Claim 2
Dependent Claim
22 words
A method for producing a speckle-free display on a screen in accordance with claim 1 wherein said voltage is a DC voltage.
Claim 3
Dependent Claim
22 words
A method for producing a speckle-free display on a screen in accordance with claim 1 wherein said voltage is an alternating voltage.
Claim 4
Independent Claim
128 words
A method for producing a speckle-free image from a coherent source on a screen, said screen comprising first and second optically transmissive electrodes and a liquid crystal having dynamic light scattering properties when subjected to a voltage gradient disposed therebetween, said method comprising the steps of: a. directing a coherent modulated and deflected light beam onto said screen, said screen being positioned such that said light beam passes through said first electrode, passes through said liquid crystal and through said second electrode; b. impressing a voltage on said electrodes to produce a voltage gradient across said liquid crystal, said voltage gradient being of sufficient magnitude to cause said liquid crystal to dynamically scatter said coherent modulated and deflected light beam thereby producing a speckle-free image on said screen.
Claim 5
Dependent Claim
25 words
A method for producing a speckle-free image on a screen in accordance with claim 5, wherein said liquid crystal is an organic nematic mesomorphic compound.
Claim 6
Dependent Claim
22 words
A method for producing a speckle-free display on a screen in accordance with claim 5 wherein said voltage is a DC voltage.
Claim 7
Dependent Claim
22 words
A method for producing a speckle-free display on a screen in accordance with claim 5 wherein said voltage is an alternating voltage.
References Cited (Backward Citations)
US3322485A
Cited
US3425771A
Cited
US3551026A
Cited
US3524145A
Cited
US3499702A
Cited
US3576364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |