US4978203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal device with an apparent hysteresis
Assignee: Semiconductor Energy Laboratory Co Ltd
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Filing: 1989-01-09
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Granted: 1990-12-18
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Expires: 2009-01-09
Abstract
Abstract An improved liquid crystal device is shown. The device comprises a pair of substrates, a liquid crystal layer disposed inbetween and a pair of electrodes formed on the opposed insides of the substrate for applying an electric field on the liquid crystal layer. Further a dielectric film is formed on a inside of the substrate of the device. In response to an electric field applied to the liquid crystal layer, an electric charge is accumulated on the dielectric film to enable the device to exhibit apparent coersive electric field.
Inventors
- 👤 Shunpei Yamazaki
- 👤 Takashi Inujima
- 👤 Toshiji Hamatani
- 👤 Toshimitsu Konuma
- 👤 Mitsunori Sakama
- 👤 Ippei Kobayashi
- 👤 Toshiharu Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:09
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133345; G02F1/1343; G02F1/135; G02F1/1358
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
122 words
A liquid crystal device comprising: first and second substrates, at least one of which is transparent; a liquid crystal layer disposed between said substrates; first and second electrodes respectively formed on the inside surfaces of said first and second substrates where said first and second electrodes are opposed to each other in order to define a plurality of pixels such that at each pixel an electric field may be applied through the liquid crystal layer; at least one floating electrode in each said pixel, each floating electrode being substantially closer to its associated first electrode than its associated second electrode; and a ferroelectric thin film made of an organic material comprising fluorine and electrically isolating said floating electrode and said first electrode.
Claim 2
Dependent Claim
122 words
A liquid crystal device comprising: first and second substrates, at least one of which is transparent; a liquid crystal layer disposed between said substrates; first and second electrodes respectively formed on the inside surfaces of said first and second substrates where said first and second electrodes are opposed to each other in order to define a plurality of pixels such that at each pixel an electric field may be applied through the liquid crystal layer; at least one floating electrode in each said pixel, each floating electrode being substantially closer to its associated first electrode than its associated second electrode; and a ferroelectric thin film made of an organic material comprising fluorine and electrically isolating said floating electrode and said first electrode.
Claim 3
Dependent Claim
17 words
A device of claim 1 wherein said organic material is a copolymer of vinylidene fluoride and trifluoroethylene.
Claim 4
Dependent Claim
19 words
A device of claim 2 wherein said ferroelectric film is formed on the inside of one of said electrodes.
Claim 5
Dependent Claim
20 words
A device of claim 1 wherein said electrodes are electrode strips orthogonally arranged on the opposed insides of the substrates.
Claim 6
Dependent Claim
26 words
A device of claim 3 wherein one of said substrates is a transparent substrate with at least one of said electrode being formed of transparent material.
Claim 7
Dependent Claim
28 words
A device as in claim 1 where the surface area of each said floating electrode is substantially as large as the cross sectional area of its associated pixel.
Claim 8
Dependent Claim
18 words
A device as in claim 1 where said floating electrode is a cluster of electrically isolated island-like conductors.
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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) | 1993-12-17 | 1994-06-18 | 1994-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-17 | 1998-06-18 | 1998-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-17 | 2002-06-18 | 2002-12-18 | $7700.00 | Window Closed / Lapsed |