Patent US4995706A successfully refreshed from Google Patents.
US4995706A
Expired / Lapsed
US
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Liquid crystal device with a ferroelectric thin film
Assignee: Semiconductor Energy Laboratory Co Ltd
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Filing: 1989-08-14
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Granted: 1991-02-26
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Expires: 2009-08-14
Abstract
Abstract An improved liquid crystal device which is driven by applying electric field thereon is shown. The liquid crystal is contained in the device as a layer which is separated into pixel and the optical condition of which is changed by the electric field applied. Contiguous to the liquid crystal layer, a ferroelectric film is provided to impart hysteresis to the device.
Inventors
- 👤 Takashi Inujima
- 👤 Shunpei Yamazaki
- 👤 Toshimitsu Konuma
- 👤 Toshiji Hamatani
- 👤 Mitsunori Sakama
- 👤 Toshiharu Yamaguchi
- 👤 Ippei Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:00
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133345; G02F1/1337; G02F1/133711
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
126 words
A liquid crystal device comprising: a pair of substrates; a ferroelectric liquid crystal layer interposed between said substrates; at least one first electrode formed on one of said substrates; a ferroelectric film having a thickness less than 1000 Å and interposed between said first electrode and said liquid crystal layer and made of an organic material comprising fluorine; at least one second electrode formed on the other substrate located opposing to said one first electrode so that the state of said liquid crystal layer is controlled by an electric field induced by the opposing electrodes where said electric field is applied across said liquid crystal layer and said ferroelectric film in series; and an organic film interposed between said second electrode and said liquid crystal layer.
Claim 2
Dependent Claim
126 words
A liquid crystal device comprising: a pair of substrates; a ferroelectric liquid crystal layer interposed between said substrates; at least one first electrode formed on one of said substrates; a ferroelectric film having a thickness less than 1000 Å and interposed between said first electrode and said liquid crystal layer and made of an organic material comprising fluorine; at least one second electrode formed on the other substrate located opposing to said one first electrode so that the state of said liquid crystal layer is controlled by an electric field induced by the opposing electrodes where said electric field is applied across said liquid crystal layer and said ferroelectric film in series; and an organic film interposed between said second electrode and said liquid crystal layer.
Claim 3
Dependent Claim
14 words
A device of claim 1 wherein at least one of said substrates is transparent.
Claim 4
Dependent Claim
23 words
A device of claim 1 wherein said first and second electrodes are opposed electrodes respectively provided on the opposite insides of said substrates.
Claim 5
Dependent Claim
29 words
A device of claim 3 wherein said electrodes are designed in the form of strips arranged in parallel on the opposed surface, and opposing and orthogonal to each other.
Claim 6
Dependent Claim
14 words
A device of claim 1 wherein the inside of said ferroelectric film is oriented.
Claim 7
Dependent Claim
12 words
A device of claim 1 said ferroelectric film is made from polyvinylidenefluoride.
Claim 8
Dependent Claim
9 words
A device of claim 3 applied to a display.
Claim 9
Dependent Claim
19 words
A device of claim 1, further comprising an oriented film interposed between said ferroelectric film and said liquid crystal.
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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) | 1994-02-25 | 1994-08-27 | 1995-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-25 | 1998-08-27 | 1999-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-25 | 2002-08-27 | 2003-02-26 | $7700.00 | Window Closed / Lapsed |