Patent US5499130A successfully refreshed from Google Patents.
US5499130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making liquid crystal device having plural stripe-shaped ribs on one substrate
Assignee: Canon Inc
•
Filing: 1995-06-05
•
Granted: 1996-03-12
•
Expires: 2015-06-05
Abstract
Abstract There is disclosed a ferroelectric liquid crystal device such as a chiral smectic liquid crystal device which is suitable for a gradation display. A chiral smectic liquid crystal is sandwiched between electrode substrates and is driven by an electric field which is applied through electrodes formed on the electrode substrates. At least one of the opposite electrode substrate surfaces periodically has a shape like a stripe-shaped rib. Liquid crystal molecules are oriented so that the normal lines of a plurality of layers which are constructed by a plurality of molecules and are arranged in a uniform direction when they are projected onto the electrode substrate surfaces perpendicularly cross the longitudinal direction of the stripe-shaped rib.
Inventors
- 👤 Shinjiro Okada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:36
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1343; G02F1/134309; G02F1/137; G02F1/139; G02F1/141; G02F1/1337; G02F1/13378; G02F1/133784; G02F2203/00; G02F2203/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
168 words
A method for producing a liquid crystal element, comprising the steps of: selecting a pair of electrode substrates; forming a configuration of periodic stripe-like ribs on at least one of the pair of electrode substrates; subjecting each of said pair of electrode substrates to a rubbing processing in which the rubbing of the lower substrate is made in a direction at an angle rotating in a clockwise direction from a rubbing direction of the upper substrate; selecting a chiral smectic liquid crystal which changes state between isotropic phase, cholesteric phase and smectic A phase according to temperature; injecting said chiral smectic liquid crystal between said pair of electrode substrates; providing means for applying a voltage between said pair of electrode substrates, said voltage forming a transmittance in said liquid crystal according to a gradation : wherein a normal line with respect to plural layers arranged in a uniform direction composed of plural molecules projected onto the surface of said electrode with said stripe-like ribs crosses said stripe-like ribs.
Claim 2
Independent Claim
168 words
A method for producing a liquid crystal element, comprising the steps of: selecting a pair of electrode substrates; forming a configuration of periodic stripe-like ribs on at least one of the pair of electrode substrates; subjecting each of said pair of electrode substrates to a rubbing processing in which the rubbing of the lower substrate is made in a direction at an angle rotating in a clockwise direction from a rubbing direction of the upper substrate; selecting a chiral smectic liquid crystal which changes state between isotropic phase, cholesteric phase and smectic A phase according to temperature; injecting said chiral smectic liquid crystal between said pair of electrode substrates; providing means for applying a voltage between said pair of electrode substrates, said voltage forming a transmittance in said liquid crystal according to a gradation : wherein a normal line with respect to plural layers arranged in a uniform direction composed of plural molecules projected onto the surface of said electrode with said stripe-like ribs crosses said stripe-like ribs.
Claim 3
Dependent Claim
16 words
A method according to claim 1, wherein a width of said rib is 10 μm-500 μm.
Claim 4
Independent Claim
137 words
A method for producing a liquid crystal element, comprising the steps of: selecting a pair of electrode substrates; forming a configuration of periodic stripe-like ribs on at least one of the pair of electrode substrates; subjecting an electrode substrate to a rubbing processing in a direction; selecting a chiral smectic liquid crystal which changes state between isotropic phase, cholesteric phase and smectic A phase according to temperature; injecting said chiral smectic liquid crystal between said pair of electrode substrates; providing means for applying a voltage between said pair of electrode substrates, said voltage forming a transmittance in said liquid crystal according to a gradation; wherein a normal line with respect to plural layers arranged in a uniform direction composed of plural molecules projected onto the surface of said electrode with said stripe-like ribs crosses said stripe-like ribs.
Claim 5
Independent Claim
137 words
A method for producing a liquid crystal element, comprising the steps of: selecting a pair of electrode substrates; forming a configuration of periodic stripe-like ribs on at least one of the pair of electrode substrates; subjecting an electrode substrate to a rubbing processing in a direction; selecting a chiral smectic liquid crystal which changes state between isotropic phase, cholesteric phase and smectic A phase according to temperature; injecting said chiral smectic liquid crystal between said pair of electrode substrates; providing means for applying a voltage between said pair of electrode substrates, said voltage forming a transmittance in said liquid crystal according to a gradation; wherein a normal line with respect to plural layers arranged in a uniform direction composed of plural molecules projected onto the surface of said electrode with said stripe-like ribs crosses said stripe-like ribs.
References Cited (Backward Citations)
US4639722A
Cited
US4655561A
Cited
US4639089A
Cited
US4712873A
Cited
US4709995A
Cited
US4682858A
Cited
US4714323A
Cited
GB2166562A
Cited
US4681404A
Cited
US4744639A
Cited
US4712877A
Cited
US4712875A
Cited
US4778259A
Cited
US4738515A
Cited
US4861143A
Cited
US4728176A
Cited
US4747671A
Cited
US4818078A
Cited
US4740060A
Cited
US4712874A
Cited
US4796980A
Cited
US4796979A
Cited
US4824218A
Cited
US4802744A
Cited
US4765720A
Cited
US4763994A
Cited
US4938574A
Cited
US4776676A
Cited
US4838663A
Cited
US4902106A
Cited
US4859036A
Cited
US5000545A
Cited
US4834506A
Cited
US4932757A
Cited
US4932758A
Cited
US5007716A
Cited
US5316805A
Cited
US5124827A
Cited
US5264954A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-03-12 | 1999-09-11 | 2000-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-12 | 2003-09-11 | 2004-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-12 | 2007-09-11 | 2008-03-12 | $7700.00 | Window Closed / Lapsed |