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US5589964A
Expired / Lapsed
US
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Ferroelectric liquid crystal device with minute convexities between adjacent electrodes
Assignee: Canon Inc
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Filing: 1995-04-27
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Granted: 1996-12-31
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Expires: 2015-04-27
Abstract
Abstract A ferroelectric liquid crystal device is constituted by a pair of substrates each having thereon a group of display electrodes, and a ferroelectric liquid crystal disposed between the substrates. Liquid crystal movement causing yellowing or local increase in liquid crystal layer thickness is minimized in the device by forming a substantial in liquid crystal layer thickness between a pixel part and a non-pixel part and/or by forming a groove having minute convexities with a maximum diameter of at least 0.1 μm at non-pixel parts on a substrate so that the groove extends in a direction forming an angle of 45-135 degrees with a normal to smectic layers of the liquid crystal.
Inventors
- 👤 Yoshio Hotta
- 👤 Yukio Hanyu
- 👤 Tadashi Mihara
- 👤 Yasuto Kodera
- 👤 Katsutoshi Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:51
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133371; G02F1/137; G02F1/139; G02F1/141
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
71 words
A ferroelectric liquid crystal device, comprising: a pair of substrates each having thereon a group of stripe-shaped electrodes, and a ferroelectric liquid crystal disposed between the substrates, wherein a groove having minute convexities is formed between neighboring stripe-shaped electrodes on a substrate, and the neighboring stripe-shaped electrodes on the substrate extend in a direction which forms an angle of 45-135 degrees with a normal to smectic layers of the liquid crystal.
Claim 2
Dependent Claim
71 words
A ferroelectric liquid crystal device, comprising: a pair of substrates each having thereon a group of stripe-shaped electrodes, and a ferroelectric liquid crystal disposed between the substrates, wherein a groove having minute convexities is formed between neighboring stripe-shaped electrodes on a substrate, and the neighboring stripe-shaped electrodes on the substrate extend in a direction which forms an angle of 45-135 degrees with a normal to smectic layers of the liquid crystal.
Claim 3
Dependent Claim
16 words
A device according to claim 1, wherein said stripe-shaped electrodes are formed on an insulating substrate.
Claim 4
Dependent Claim
14 words
A device according to claim 2, wherein said insulating substrate comprises a glass substrate.
Claim 5
Dependent Claim
18 words
A device according to claim 1, wherein said convexities have an average diameter of at least 0.1 μm.
Claim 6
Dependent Claim
17 words
A device according to claim 1, wherein said convexities have a diameter of at most 3 μm.
Claim 7
Dependent Claim
20 words
A device according to claim 1, wherein the groove having minute convexities has a width of at most 20 μm.
Claim 8
Dependent Claim
18 words
A device according to claim 1, wherein said stripe-shaped electrodes are formed in a thickness of 300-5000 Å.
Claim 9
Dependent Claim
16 words
A device according to claim 1, wherein said stripe-shaped electrodes are covered with an alignment film.
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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) | 1999-12-31 | 2000-07-01 | 2000-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-31 | 2004-07-01 | 2004-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-31 | 2008-07-01 | 2008-12-31 | $7700.00 | Window Closed / Lapsed |