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US4664482A
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Liquid crystal display device having a chiral additive and angularly displaced polarizers
Assignee: Hitachi Ltd
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Filing: 1986-03-12
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Granted: 1987-05-12
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Expires: 2006-03-12
Abstract
Abstract A liquid crystal display device wherein a nematic liquid crystal having a positive dielectric anisotropy and added with a chiral material is sealed between a pair of upper and lower substrates so as to constitute a helical structure twisted within a range between 200° and 260° along a direction of thickness thereof, and polarizing axes or absorption axes of a pair of polarizing plates disposed on the upper and lower substrates are angularly displaced by a predetermined angle or predetermined angles from major axes of liquid crystal molecules adjacent to the upper and lower substrates, respectively.
Inventors
- 👤 Yasuhiko Kando
- 👤 Tamihito Nakagomi
- 👤 Shinji Hasegawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:49
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/137; G02F1/139; G02F1/1396; G02F1/1397
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
110 words
A liquid crystal display device wherein a nematic liquid crystal having a positive dielectric anisotropy and added with a chiral material is sealed between a pair of upper and lower substrates with electrodes thereon and orienting layers formed on the electrodes and exposed surfaces thereof so as to constitute a helical structure twisted within a range between 200° and 260° along a direction of thickness thereof, and polarizing axes or absorption axes of a pair of polarizing plates disposed on said upper and lower substrates are angularly displaced by a predetermined angle or predetermined angels from major axes of liquid crystal molecules adjacent to said upper and lower substrates, respectively.
Claim 2
Dependent Claim
110 words
A liquid crystal display device wherein a nematic liquid crystal having a positive dielectric anisotropy and added with a chiral material is sealed between a pair of upper and lower substrates with electrodes thereon and orienting layers formed on the electrodes and exposed surfaces thereof so as to constitute a helical structure twisted within a range between 200° and 260° along a direction of thickness thereof, and polarizing axes or absorption axes of a pair of polarizing plates disposed on said upper and lower substrates are angularly displaced by a predetermined angle or predetermined angels from major axes of liquid crystal molecules adjacent to said upper and lower substrates, respectively.
Claim 3
Dependent Claim
55 words
A device according to claim 1, wherein said absorption axis or said polarizing axis of each of said polarizing plates and a direction of a corresponding one of said major axes of the liquid crystal molecules adjacent to said upper and lower substrates constitute an included angle falling within a range between 20° and 70°.
Claim 4
Dependent Claim
35 words
A device according to claim 1, wherein a product Δn·d of a thickness d (μm) of a liquid crystal layer and its optical anisotropy Δn falls within a range from 0.7 μm to 1.2 μm.
Claim 5
Dependent Claim
24 words
A device according to claim 1, wherein said orienting layers are formed by rubbing surfaces coated by polyimide resin of electrodes and exposed surfaces.
Claim 6
Dependent Claim
138 words
A liquid crystal display device wherein a nematic liquid crystal having a positive dielectric anisotropy and added with a chiral material is sealed between a pair of upper and lower substrates with electrodes thereon and orienting layers formed on the electrodes and exposed surfaces thereof so as to constitute a helical structure twisted within a range between 200° and 260° along a direction of thickness thereof, polarizing axes or absorption axes of a pair of polarizing plates disposed on said upper and lower substrates are angularly displaced by an angle between 20° and 70° from major axes of liquid crystal molecules adjacent to said upper and lower substrates, respectively, and a product Δn·d of a thickness d (μm) and an optical anisotropy Δn of a liquid crystal layer falls within a range from 0.7 μm to 1.2 μm.
Claim 7
Dependent Claim
138 words
A liquid crystal display device wherein a nematic liquid crystal having a positive dielectric anisotropy and added with a chiral material is sealed between a pair of upper and lower substrates with electrodes thereon and orienting layers formed on the electrodes and exposed surfaces thereof so as to constitute a helical structure twisted within a range between 200° and 260° along a direction of thickness thereof, polarizing axes or absorption axes of a pair of polarizing plates disposed on said upper and lower substrates are angularly displaced by an angle between 20° and 70° from major axes of liquid crystal molecules adjacent to said upper and lower substrates, respectively, and a product Δn·d of a thickness d (μm) and an optical anisotropy Δn of a liquid crystal layer falls within a range from 0.7 μm to 1.2 μm.
Claim 8
Dependent Claim
24 words
A device according to claim 5, wherein said orienting layers are formed by rubbing surfaces coated by polyimide resin of electrodes and exposed surfaces.
References Cited (Backward Citations)
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US4596446B2
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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) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |