US4712875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dimensions of spacer particles for a ferroelectric liquid crystal display
Assignee: Canon Inc
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Filing: 1986-05-14
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Granted: 1987-12-15
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Expires: 2006-05-14
Abstract
Abstract A liquid crystal device comprising a pair of base plates and a ferroelectric chiral smectic liquid crystal disposed between the base plates. The pair of base plates being secured to each other to leave a spacing which is small enough to release the spiral structure of the ferroelectric chiral smectic liquid crystal due to the wall effect of the base plates. Fibrous spacers having a diameter d (μm) and an average length l satisfying the relationship of 3≦l/d≦100 are disposed together with the ferroelectric chiral smectic liquid crystal.
Inventors
- 👤 Akira Tsuboyama
- 👤 Kazuharu Katagiri
- 👤 Junichiro Kanbe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:47
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1339; G02F1/13392; G02F1/13394; G02F1/137; G02F1/139; G02F1/141
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
93 words
In a liquid crystal device comprising a pair of base plates and a ferroelectric chiral smectic liquid crystal disposed between the base plates, said pair of base plates being secured to each other to leave a spacing which is small enough to release the spiral structure of the ferroelectric chiral smectic liquid crystal due to the wall effect of the base plates; the improvement wherein fibrous spacers having a diameter d (μm) and an average length l satisfying the relationship of 3≦l/d≦ 100, are disposed together with the ferroelectric chiral smectic liquid crystal.
Claim 2
Dependent Claim
93 words
In a liquid crystal device comprising a pair of base plates and a ferroelectric chiral smectic liquid crystal disposed between the base plates, said pair of base plates being secured to each other to leave a spacing which is small enough to release the spiral structure of the ferroelectric chiral smectic liquid crystal due to the wall effect of the base plates; the improvement wherein fibrous spacers having a diameter d (μm) and an average length l satisfying the relationship of 3≦l/d≦ 100, are disposed together with the ferroelectric chiral smectic liquid crystal.
Claim 3
Dependent Claim
24 words
A liquid crystal device according to claim 1, wherein said wall effect comprises an effect of orienting uniaxial liquid crystal molecules in one direction.
Claim 4
Dependent Claim
31 words
A liquid crystal device according to claim 2, wherein said effect of orienting uniaxial liquid crystal molecules in one direction has been obtained by rubbing the face of a base plate.
Claim 5
Dependent Claim
25 words
A liquid crystal device according to claim 1, wherein said fibrous spacers are distributed at a rate of 0.1 to 100 per mm 2 .
Claim 6
Dependent Claim
25 words
A liquid crystal device according to claim 1, wherein said fibrous spacers are distributed at a rate of 0.5 to 50 per mm 2 .
Claim 7
Dependent Claim
27 words
A liquid crystal device according to claim 1, wherein the diameter d and the average length l of said fibrous spacers satisfy the relationship of 3≦ l/d≦20.
Claim 8
Dependent Claim
15 words
A liquid crystal device according to claim 1, wherein said fibrous spacers comprise glass fiber.
Claim 9
Dependent Claim
49 words
A liquid crystal device according to claim 1, wherein said chiral smectic liquid crystal is a liquid crystal showing a successive phase transition of isotropic phase, cholesteric phase, and smectic A phase in the course of temperature decrease from a temperature higher than that giving the chiral smectic phase.
Claim 10
Dependent Claim
25 words
A liquid crystal device according to claim 1, wherein at least one of said pair of base plates is provided with an orientation controlling film.
Claim 11
Dependent Claim
39 words
A liquid crystal device according to claim 9, wherein said orientation controlling film comprises a film of silicon monoxide, silicon dioxide, aluminum oxide, titanium oxide, zirconia, magnesium fluoride, cerium oxide, cerium fluoride, silicon nitride, silicon carbide, or boron nitride.
Claim 12
Dependent Claim
42 words
A liquid crystal device according to claim 9, wherein said orientation controlling film comprises a film of polyvinyl alcohol, polyimide, polyamide-imide, polyester-imide, polyparaxylylene, polyester, polycarbonate, polyvinyl acetal, polyvinyl chloride, polyvinyl acetate, polyamide, polystyrene, cellulose resin, melamine resin, urea resin and acrylic resin.
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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) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |