US5062691A
Expired / Lapsed
US
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Liquid crystal device with grey scale
Assignee: 3M Innovative Properties Co
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Filing: 1990-08-03
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Granted: 1991-11-05
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Expires: 2010-08-03
Abstract
Abstract A ferroelectric liquid crystal device comprising a transparent substrate, an opposed substrate, the substrates disposed to provide a non-helicoidal alignment of the ferroelectric liquid crystal material, a ferroelectric liquid crystal material disposed between the substrates and electrodes on the substrates to define one or a plurality of pixels, each pixel exhibiting controlled continuously variable light transmission as a function of applied field and wherein the molecular orientation of the liquid crystal material is continuously variable and controllable.
Inventors
- 👤 Miguel G. Tristani-Kendra
- 👤 George Papapolymerou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:41
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/139; G02F1/141
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
78 words
A ferroelectric liquid crystal device comprising a transparent substrate, an opposed substrate, said substrates disposed to provide a non-helicoidal alignment of the ferroelectric liquid crystal material, a ferroelectric liquid crystal material disposed between said substrates and electrodes on said substrates to define one or a plurality of pixels, each said pixel exhibiting controlled continuously variable light transmission as a function of applied field and wherein the molecular orientation of the liquid crystal material is continuously variable and controllable.
Claim 2
Dependent Claim
78 words
A ferroelectric liquid crystal device comprising a transparent substrate, an opposed substrate, said substrates disposed to provide a non-helicoidal alignment of the ferroelectric liquid crystal material, a ferroelectric liquid crystal material disposed between said substrates and electrodes on said substrates to define one or a plurality of pixels, each said pixel exhibiting controlled continuously variable light transmission as a function of applied field and wherein the molecular orientation of the liquid crystal material is continuously variable and controllable.
Claim 3
Dependent Claim
19 words
The device of claim 1 wherein said device exhibits a change in capacitance with a change in bias voltage.
Claim 4
Dependent Claim
41 words
The device of claim 1 wherein said device exhibits a change in the capacitance of at least 5% for a change in bias voltage of up to +/-15 volts/micron after a sufficiently high bias has been applied to remove polarization effects.
Claim 5
Dependent Claim
13 words
The device of claim 1 wherein said electrodes are of indium tin oxide.
Claim 6
Dependent Claim
18 words
The device of claim 1 wherein at least one of said substrates has an alignment layer applied thereon.
Claim 7
Dependent Claim
13 words
The device of claim 1 wherein said ferroelectric liquid crystal material is fluorinated.
Claim 8
Dependent Claim
11 words
The device of claim 1 wherein said opposed substrate is transparent.
Claim 9
Dependent Claim
11 words
The device of claim 1 wherein said opposed substrate is reflective.
Claim 10
Dependent Claim
28 words
The device of claim 1 wherein said device further comprises a dye disposed between said substrates, said ferroelectric liquid crystal material and said dye exhibiting the guest-host effect.
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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) | 1994-11-04 | 1995-05-06 | 1995-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-04 | 1999-05-06 | 1999-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-04 | 2003-05-06 | 2003-11-05 | $7700.00 | Window Closed / Lapsed |