Patent US4775225A successfully refreshed from Google Patents.
US4775225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal device having pillar spacers with small base periphery width in direction perpendicular to orientation treatment
Assignee: Canon Inc
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Filing: 1986-05-14
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Granted: 1988-10-04
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Expires: 2006-05-14
Abstract
Abstract A liquid crystal device comprising a first base plate which has projections thereon and has been subjected to a uniaxial orientation treatment, a second base plate disposed oppositely spaced from the first base plate with the projections therebetween as spacers, and a liquid crystal disposed between the first and second base plates. The projections have a section taken in parallel with the base plates, and the section has a side with a length of 0-20 μm in a direction perpendicular to the uniaxial orientation treatment. The projections may be in the form of rectangular pillars, cylindrical pillars, oval pillars, or hexagonal pillars.
Inventors
- 👤 Akira Tsuboyama
- 👤 Hitoshi Shindo
- 👤 Kazuharu Katagiri
- 👤 Junichiro Kanbe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:37
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1339; G02F1/13394; G02F1/13392; G02F1/137; G02F1/139; G02F1/141
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
96 words
A liquid crystal device, comprising: a pair of base plates having a ferroelectric liquid crystal disposed in a layer thereinbetween, wherein at least one of said pair of base plates is provided with a plurality of transparent stripe electrodes disposed with a spacing G therebetween, an insulating layer coating the stripe electrodes, and spacers for setting the thickness of the liquid crystal layer disposed on the insulating layer in such a manner so as to cover the spacing between the stripe electrodes, wherein said spacers have a width D satisfying the relatioship of D=(1.2 to 1.5)·G.
Claim 2
Dependent Claim
96 words
A liquid crystal device, comprising: a pair of base plates having a ferroelectric liquid crystal disposed in a layer thereinbetween, wherein at least one of said pair of base plates is provided with a plurality of transparent stripe electrodes disposed with a spacing G therebetween, an insulating layer coating the stripe electrodes, and spacers for setting the thickness of the liquid crystal layer disposed on the insulating layer in such a manner so as to cover the spacing between the stripe electrodes, wherein said spacers have a width D satisfying the relatioship of D=(1.2 to 1.5)·G.
Claim 3
Dependent Claim
20 words
A liquid crystal device according to claim 1, wherein the G is in the range of 10 to 100 μm.
Claim 4
Dependent Claim
26 words
A liquid crystal device according to claim 1, wherein at least one of said pair of base plates has been subjected to a uniaxial orientation treatment.
Claim 5
Dependent Claim
19 words
A liquid crystal device according to claim 1, wherein said ferroelectric liquid crystal is a chiral smectic liquid crystal.
Claim 6
Dependent Claim
35 words
A liquid crystal device according to claim 1, wherein said pair of base plates are spaced from each other with a spacing therebetween small enough to release the spiral structure of the ferroelectric 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) | 1991-10-04 | 1992-04-04 | 1992-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-04 | 1996-04-04 | 1996-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-04 | 2000-04-04 | 2000-10-04 | $7700.00 | Window Closed / Lapsed |