US3575491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Decreasing response time of liquid crystals
Assignee: RCA Corp
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Filing: 1968-10-16
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Granted: 1971-04-20
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Expires: 1988-10-16
Abstract
Abstract The speed of response of a liquid crystal is increased without degrading the crystal, by applying the crystal an electric field which is of substantially greater value than the minimum value of field required to achieve substantially maximum light scattering from the crystal and, after a short interval, reducing the magnitude of the applied field to a value close to said minimum value.
Inventors
- 👤 George H Heilmeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:58
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/13306
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
24 words
In the method set forth in claim 1, said relatively short interval of time being of the order of a hundredth of a second.
Claim 2
Independent Claim
85 words
A method for increasing the speed of response of a liquid crystal cell comprising the steps of: applying across the cell an electric field at least double that of the field required to produce substantially maximum light scattering in the crystal; and after an interval of time less than that which will permit substantial degradation of the liquid crystal to occur, decreasing the magnitude of the applied field to a value close to that at which the crystal begins to exhibit substantially maximum light scattering.
Claim 3
Dependent Claim
136 words
In combination: a light shutter comprising two transparent insulating layers, a nematic liquid crystal located between said layers and two transparent conductor layers, one on the inner surface of each insulating layer, adjacent to the liquid crystal; light-sensing means located adjacent to said shutter for producing an electrical signal in response to light of greater than a given magnitude; circuit means which, in response to said signal, produces an output voltage having an initial value which is substantially greater than a minimum value required to produce substantially maximum light scattering in said liquid crystal, and which within a fraction of a second reduces to a value equal to or slightly greater than said minimum value; means for applying said signal to said circuit means; and means for applying said output voltage across said two transparent conductors.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |