US5032009A
Expired / Lapsed
US
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Process of aligning and realigning liquid crystal media
Assignee: Elsicon Inc
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Filing: 1990-08-13
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Granted: 1991-07-16
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Expires: 2010-08-13
Abstract
Abstract A process of aligning or realigning a liquid crystal medium adjacent to a substrate which process comprises (1) exposing anisotropically absorbing molecules disposed on the substrate, disposed in the liquid crystal medium or which themselves are the liquid crystal medium to linearly polarized light of a wavelength or wavelengths within the absorption band of the anisotropically absorbing molecules, wherein (a) the exposed anisotropically absorbing molecules induce alignment of the liquid crystal medium at an angle + and - theta with respect to the direction of the linear polarization of the incident light beam and along a surface of the liquid crystal medium, (b) the liquid crystal medium comprises liquid crystals having a molecular weight of less than 1500, and (c) the anisotropically absorbing molecules are exposed by (i) linearly polarized light transmitted through at least one mask having a pattern, (ii) a beam of linearly polarized light scanned in a pattern or (iii) patterns created by interference of coherent linearly polarized light beams, and (2) terminating exposure, whereby the liquid crystal medium aligned or realigned by the exposure step remains aligned or realigned and has two or more discrete regions having different alignments, and liquid crystal devices prepared by this process, are disclosed.
Inventors
- 👤 Wayne M. Gibbons
- 👤 Shao-Tang Sun
- 👤 Brian J. Swetlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:29
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/13725; C; C09; C09K; C09K19/00; C09K19/52; C09K19/54; C09K19/56; C09K19/60; C09K19/606; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; G02F1/13378; G02F1/133788; G11; G11B; G11B7/00; G11B7/004; G11B7/0055; G11B7/00555; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/25; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
193 words
A process of aligning or realigning a liquid crystal medium adjacent to a substrate which process comprises (1) exposing anisotropically absorbing molecules disposed on the substrate, disposed in the liquid crystal medium or which themselves are the liquid crystal medium to linearly polarized light of a wavelength or wavelengths within the absorption band of the anisotropically absorbing molecules, wherein (a) the exposed anisotropically absorbing molecules induce alignment of the liquid crystal medium at an angle + and - θ with respect to the direction of the linear polarization of the incident light beam and along a surface of the liquid crystal medium, (b) the liquid crystal medium comprises liquid crystals having a molecular weight of less than 1500, and (c) the anisotropically absorbing molecules are exposed by (i) linearly polarized light transmitted through at least one mask having a pattern, (ii) a beam of linearly polarized light scanned in a pattern or (iii) patterns created by interference of coherent linearly polarized light beams, and (2) terminating exposure, whereby the liquid crystal medium aligned or realigned by the exposure step remains aligned or realigned and has two or more discrete regions having different alignments.
Claim 2
Dependent Claim
193 words
A process of aligning or realigning a liquid crystal medium adjacent to a substrate which process comprises (1) exposing anisotropically absorbing molecules disposed on the substrate, disposed in the liquid crystal medium or which themselves are the liquid crystal medium to linearly polarized light of a wavelength or wavelengths within the absorption band of the anisotropically absorbing molecules, wherein (a) the exposed anisotropically absorbing molecules induce alignment of the liquid crystal medium at an angle + and - θ with respect to the direction of the linear polarization of the incident light beam and along a surface of the liquid crystal medium, (b) the liquid crystal medium comprises liquid crystals having a molecular weight of less than 1500, and (c) the anisotropically absorbing molecules are exposed by (i) linearly polarized light transmitted through at least one mask having a pattern, (ii) a beam of linearly polarized light scanned in a pattern or (iii) patterns created by interference of coherent linearly polarized light beams, and (2) terminating exposure, whereby the liquid crystal medium aligned or realigned by the exposure step remains aligned or realigned and has two or more discrete regions having different alignments.
Claim 3
Dependent Claim
28 words
The process as claimed in claim 1 wherein the anisotropically absorbing molecules are exposed by the linearly polarized light transmitted through at least one mask having a pattern.
Claim 4
Dependent Claim
25 words
The process as claimed in claim 1 wherein the anisotropically absorbing molecules are exposed by the beam of linearly polarized light scanned in a pattern.
Claim 5
Dependent Claim
26 words
The process as claimed in claim 1 wherein the anisotropically absorbing molecules are exposed by the patterns created by interference of coherent linearly polarized light beams.
Claim 6
Dependent Claim
22 words
The process as in claim 1 wherein the linearly polarized light has a wavelength between about 150 nm and about 2000 nm.
Claim 7
Dependent Claim
17 words
The process as claimed in claim 1 wherein the linearly polarized light is emitted from a laser.
Claim 8
Dependent Claim
20 words
The process as claimed in claim 6 wherein the laser light is emitted from an argon, helium-neon or helium-cadmium laser.
Claim 9
Dependent Claim
37 words
The process of claim 1 wherein the anisotropically absorbing molecules are selected from the group consisting of thermotropic liquid crystal compounds and dichroic dyes which exhibit dichroic absorption bands between about 150 nm and about 2000 nm.
Claim 10
Dependent Claim
16 words
The process as in claim 1 wherein the liquid crystal medium contains the anisotropically absorbing molecules.
Claim 11
Dependent Claim
15 words
The process as in claim 9 wherein the anisotropically absorbing molecules are thermotropic liquid crystals.
Claim 12
Dependent Claim
32 words
The process as claimed in claim 1 wherein the liquid crystal medium comprises at least one thermotropic liquid crystal compound selected from the group consisting of nematic and smectic liquid crystal compounds.
Claim 13
Dependent Claim
18 words
The process as claimed in claim 11 wherein the liquid crystal medium comprises the nematic liquid crystal compounds.
Claim 14
Dependent Claim
18 words
The process as claimed in claim 11 wherein the liquid crystal medium comprises the smectic liquid crystal compounds.
Claim 15
Dependent Claim
17 words
The process as claimed in claim 13 wherein the smectic liquid compounds are ferroelectric liquid crystal compounds.
Claim 16
Dependent Claim
39 words
The process as claimed in claim 1 wherein the liquid crystal medium comprises at least one dichroic dye which exhibits dichroic absorption between about 150 nm and about 2000 nm dissolved in at least one thermotropic liquid crystal compound.
Claim 17
Dependent Claim
46 words
The process as claimed in claim 15 wherein the dichroic dye is selected from the group consisting of azo, diazo, triazo, tetraazo, pentaazo, anthraquinone, mericyanine, methine, 2-phenylazothiazole, 2-phenylazobenzthiazole, 4,4'-bis(arylazo)stilbenes, perylene and 4,8-diamino-1,5-naphthoquinone dyes that exhibit dichroic absorption bands between about 150 nm and about 2000 nm.
Claim 18
Dependent Claim
20 words
The process as claimed in claim 15 wherein the anisotropically absorbing molecules are one or more of the dichroic dyes.
Claim 19
Dependent Claim
18 words
The process as claimed in claim 1 wherein the liquid crystal composition does not contain a dichroic dye.
Claim 20
Dependent Claim
25 words
The process as claimed in claim 1 further comprising that the liquid crystal medium is filled into a cell comprising a front and rear substrate.
Claim 21
Dependent Claim
19 words
The process of claim 19 wherein exposure to linearly polarized light is carried out after the cell is filled.
Claim 22
Dependent Claim
19 words
The process of claim 19 wherein at least one of the substrates is coated with a rubbed alignment layer.
Claim 23
Dependent Claim
37 words
The process as claimed in claim 21 wherein the anisotropically absorbing molecules comprise at least one dichroic dye which exhibit dichroic absorption between about 150 nm and about 2000 nm which is part of the alignment layer.
Claim 24
Dependent Claim
35 words
The process as claimed in claim 22 wherein the liquid crystal medium also contains anisotropically absorbing molecules comprising at least one dichroic dye which exhibit dichroic absorption between about 150 nm and about 2000 nm.
Claim 25
Dependent Claim
24 words
The process as claimed in claim 1 wherein the liquid crystal medium is aligned into two or more discrete regions having different homogeneous alignments.
Claim 26
Dependent Claim
17 words
The process as claimed in claim 1 wherein the liquid crystal medium has a negative dielectric anisotropy.
Claim 27
Dependent Claim
52 words
The process as claimed in claim 1 wherein the anisotropically absorbing molecules are selected from the group consisting of dichroic dyes which exhibit dichroic absorption between about 150 nm and about 2000 nm and the dichroic dyes are coated on at least one inner surface of a cell substrate prior to exposure.
Claim 28
Dependent Claim
23 words
The process as claimed in claim 1 wherein the liquid crystal medium comprises liquid crystals having a molecular weight of 1000 or less.
Claim 29
Dependent Claim
23 words
The process as claimed in claim 1 wherein the liquid crystal medium comprises liquid crystals having a molecular weight of 650 or less.
References Cited (Backward Citations)
US3836243A
Cited
US4040047A
Cited
US3999838A
Cited
JPS54153053A
Cited
US4291949A
Cited
US4354740A
Cited
US4472027A
Cited
US4477151A
Cited
US4606613A
Cited
JPS60111224A
Cited
JPS60217339A
Cited
US4701029A
Cited
US4836653A
Cited
US4796980A
Cited
US4893907A
Cited
GB2200650A
Cited
US4775226A
Cited
EP0265120A1
Cited
EP0275999A2
Cited
JPH0261614A
Cited
US4974941A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-15 | 1995-01-14 | 1995-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-15 | 1999-01-14 | 1999-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-15 | 2003-01-14 | 2003-07-16 | $7700.00 | Window Closed / Lapsed |