US4882207A
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Ferroelectric liquid crystal cells
Assignee: STC PLC
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Filing: 1987-10-28
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Granted: 1989-11-21
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Expires: 2007-10-28
Abstract
Abstract A ferroelectric liquid crystal cell is provided with one alignment layer (14) constituted by rubbed nylon which promotes planar alignment in a specific azimuthal direction and the other alignment layer (15) constituted by a polymer with flexible side chains which promotes planar alignment without any preferred azimuthal direction.
Inventors
- 👤 David Coates
- 👤 Matthew F. Bone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:55
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; C; C09; C09K; C09K19/00; C09K19/02; C09K19/0225; C09K19/04; C09K19/40; C09K19/406; C09K19/408; C09K2323/00; C09K2323/02; G02F1/137; G02F1/139; G02F1/141
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
87 words
A ferroelectric liquid crystal cell having a liquid crystal layer contained within an envelope, in which cell, for the promotion of parallel alignment of the molecules of the liquid crystal layer at at least one of its two major surfaces, at least one of said major surfaces is in contact with an associated polymer layer having a molecular structure with flexible side chains of sufficient length and flexibility to provide no preferential azimuthal direction of alignment for the molecules of the liquid crystal layer in contact therewith.
Claim 2
Dependent Claim
87 words
A ferroelectric liquid crystal cell having a liquid crystal layer contained within an envelope, in which cell, for the promotion of parallel alignment of the molecules of the liquid crystal layer at at least one of its two major surfaces, at least one of said major surfaces is in contact with an associated polymer layer having a molecular structure with flexible side chains of sufficient length and flexibility to provide no preferential azimuthal direction of alignment for the molecules of the liquid crystal layer in contact therewith.
Claim 3
Dependent Claim
22 words
A ferroelectric liquid crystal cell as claimed in claim 1 wherein the material of said polymer layer is a liquid crystal polymer.
Claim 4
Dependent Claim
81 words
A ferroelectric liquid crystal cell as claimed in claim 1 wherein one major surface of the liquid crystal layer is in contact with a polymer layer having said molecular structure with flexible side chains, while the other major surface is in contact with a polymer layer that has been rubbed in order to promote planar alignment of the molecules of the liquid crystal layer in the rubbing direction at least when those molecules are present in an untilted liquid crystal phase.
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) | 1992-11-20 | 1993-05-22 | 1993-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-20 | 1997-05-22 | 1997-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-20 | 2001-05-22 | 2001-11-21 | $7700.00 | Window Closed / Lapsed |