US5126864A
Expired / Lapsed
US
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Ferroelectric liquid crystal panel having a ferroelectric optical compensating liquid crystal cell
Assignee: Stanley Electric Co Ltd
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Filing: 1990-02-16
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Granted: 1992-06-30
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Expires: 2010-02-16
Abstract
Abstract A ferroelectric liquid crystal panel comprising 2 layers of liquid crystal cells, each of which comprises a ferroelectric crystal sealed between two substrates and then is laminated together; wherein one of said liquid crystal cells is operated as a panel driving liquid crystal cell and the other of said liquid crystal cells is operated as an optical compensating cell, while both said liquid crystal cells being driven by rectangular wave AC signals. Furthermore, the ferroelectric liquid crystal panel is constructed to operate in an intermediate tone by varying the phases of said rectangular wave AC signals applied to the liquid crystal cells of the first and second layers.
Inventors
- 👤 Ryouichi Akiyama
- 👤 Kazuhisa Ui
- 👤 Koutaro Yoneda
- 👤 Masafumi Ide
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:11
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1347; G02F1/13471; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G02F1/137; G02F1/139; G02F1/141; G02F2203/00; G02F2203/30; G09G2300/00; G09G2300/02; G09G2300/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A ferroelectric liquid crystal panel comprising 2 layers of liquid crystal cells disposed between two polarizers, each of said cells comprising a ferroelectric liquid crystal sealed between two substrates, wherein said cells are laminated together and, wherein one of said liquid crystal cells is operated as a panel driving liquid crystal cell and the other of said liquid crystal cells is operated as an optical compensating cell, both said liquid crystal cells being driven individually by rectangular wave AC signals and wherein said ferroelectric liquid crystal panel is operated in an intermediate tone by varying the phases of said rectangular wave AC signals applied to the liquid crystal cells of the first and second layers.
Claim 2
Dependent Claim
115 words
A ferroelectric liquid crystal panel comprising 2 layers of liquid crystal cells disposed between two polarizers, each of said cells comprising a ferroelectric liquid crystal sealed between two substrates, wherein said cells are laminated together and, wherein one of said liquid crystal cells is operated as a panel driving liquid crystal cell and the other of said liquid crystal cells is operated as an optical compensating cell, both said liquid crystal cells being driven individually by rectangular wave AC signals and wherein said ferroelectric liquid crystal panel is operated in an intermediate tone by varying the phases of said rectangular wave AC signals applied to the liquid crystal cells of the first and second layers.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-30 | 1995-12-30 | 1996-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-30 | 1999-12-30 | 2000-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-30 | 2003-12-30 | 2004-06-30 | $7700.00 | Window Closed / Lapsed |