US3914022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quasi-homeotropic twisted nematic liquid crystal device
Assignee: LXD Inc
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Filing: 1974-07-02
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Granted: 1975-10-21
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Expires: 1994-07-02
Abstract
Abstract A liquid crystal device is described comprising a homeotropic, negative dielectric anisotropy, nematic liquid crystal material. The interior surfaces of the bounding substrates are treated to provide a preferred orientation for the liquid crystal molecules in the activated state. The preferred orientation of the substrates is orthogonal to provide a molecular twist in the activated state. Transmissive and reflective embodiments are disclosed.
Inventors
- 👤 Richard A Kashnow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:04
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; G02F1/133719; G02F1/137; G02F1/139; G02F1/1393
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
105 words
A liquid crystal device comprising: a polarizer for polarizing light entering said device; an analyzer for analyzing light after passage through said device; a first boundary substrate; a second boundary substrate, parallel to and spaced from said first substrate; said first and second substrates each having transparent electrodes on the interior surfaces thereof; a negative dielectric anisotropy, nematic liquid crystal material filling the volume defined by said first and second substrates; and said device being contructed such that said liquid crystal material is characterized by a quasi-homeotropic boundary condition in the quiescent state, and a homogeneous twisted nematic bulk molecular arrangement in the active state.
Claim 2
Dependent Claim
105 words
A liquid crystal device comprising: a polarizer for polarizing light entering said device; an analyzer for analyzing light after passage through said device; a first boundary substrate; a second boundary substrate, parallel to and spaced from said first substrate; said first and second substrates each having transparent electrodes on the interior surfaces thereof; a negative dielectric anisotropy, nematic liquid crystal material filling the volume defined by said first and second substrates; and said device being contructed such that said liquid crystal material is characterized by a quasi-homeotropic boundary condition in the quiescent state, and a homogeneous twisted nematic bulk molecular arrangement in the active state.
Claim 3
Dependent Claim
26 words
The device as set forth in claim 1 and further comprising: said polarizer and said analyzer are first and second polarizers positioned one adjacent each substrate.
Claim 4
Dependent Claim
18 words
The device as set forth in claim 2 wherein the planes of polarization of said polarizers are orthogonal.
Claim 5
Dependent Claim
18 words
The device as set forth in claim 2 wherein the planes of polarization of said polarizers are parallel.
Claim 6
Dependent Claim
23 words
The device as set forth in claim 2 and further comprising a reflecting surface positioned parallel to and adjacent one of said polarizers.
Claim 7
Dependent Claim
23 words
The device as set forth in claim 1 wherein said liquid crystal has a molecular twist of approximately 90* in the active state.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |