Patent US4869577A successfully refreshed from Google Patents.
US4869577A
Expired / Lapsed
US
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Ferroelectric liquid crystal display device having uniaxial alignment on both substrates
Assignee: Canon Inc
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Filing: 1987-07-21
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Granted: 1989-09-26
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Expires: 2007-07-21
Abstract
Abstract A liquid crystal display device comprises a pair of substrates each provided with a transparent electrode, and a ferroelectric liquid crystal disposed therebetween. One of the substrates has thereon a homogeneous alignment, and the other substrate has thereon a tilted alignment film for aligning liquid crystal molecules in contact therewith in a tilted direction with respect to the face thereof. The combination of the two-types of alignment films provides a monodomain of uniformly aligned ferroelectric liquid crystal molecules, which leads to an improved display characteristic including increased contrast.
Inventors
- 👤 Yuichi Masaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:05
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/137; G02F1/139; G02F1/141
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
73 words
A liquid crystal display device, comprising: a pair of substrates each provided with a transparent electrode having a ferroelectric liquid crystal disposed therebetween, wherein one substrate has thereon a homogeneous alignment film provided with a uniaxial orientation treatment, and the other substrate has thereon an alignment film obtained by coating said other substrate with a homogeneous alignment film and coating that alignment film with a homeotropic alignment film having a uniaxial orientation treatment.
Claim 2
Dependent Claim
73 words
A liquid crystal display device, comprising: a pair of substrates each provided with a transparent electrode having a ferroelectric liquid crystal disposed therebetween, wherein one substrate has thereon a homogeneous alignment film provided with a uniaxial orientation treatment, and the other substrate has thereon an alignment film obtained by coating said other substrate with a homogeneous alignment film and coating that alignment film with a homeotropic alignment film having a uniaxial orientation treatment.
Claim 3
Dependent Claim
29 words
A device according to claim 1, wherein said ferroelectric liquid crystal comprises a compound selected from the group consisting of Schiff's base-type, ester-type and biphenyl-type ferroelectric liquid crystal compounds.
Claim 4
Dependent Claim
33 words
A device according to claim 1, wherein said first alignment film has been obtained by coating said one substrate with an insulating film of polyimide or polyamide, and then rubbing the insulating film.
Claim 5
Dependent Claim
23 words
A device according to claim 3, wherein the insulating film is formed by a coating method selected from spinner coating, printing, and dipping.
Claim 6
Dependent Claim
38 words
A device according to claim 1, wherein said first alignment film has been obtained by coating said one substrate with an insulating film of SiO 2 , SiO or TiO 2 , and then rubbing the insulating film.
Claim 7
Dependent Claim
27 words
A device according to claim 1, wherein said first alignment film has been obtained by oblique vapor deposition of SiO 2 , SiO or TiO 2 .
Claim 8
Dependent Claim
34 words
A device according to claim 1, wherein said first alignment film has been obtained by vapor-depositing an insulating film of SiO 2 , SiO or TiO 2 , and then rubbing the insulating film.
Claim 9
Dependent Claim
37 words
A device according to claim 1, wherein said alignment film provided with a homogeneous aligning treatment has been formed by coating said the other substrate with a polymer film-forming material, followed by heating for curing and rubbing.
Claim 10
Dependent Claim
13 words
A device according to claim 8, wherein said polymer film-forming material is polyimide.
Claim 11
Dependent Claim
24 words
A device according to claim 1, wherein said uniaxial aligning treatment is a rubbing treatment applied to the homeotropic alignment film formed in advance.
Claim 12
Dependent Claim
19 words
A device according to claim 1, wherein said homeotropic alignment film comprises a surfactant having a fluorinated carbon chain.
Claim 13
Dependent Claim
20 words
A device according to claim 1, wherein said homeotropic alignment film comprises a silane compound having a fluorinated carbon chain.
Claim 14
Dependent Claim
17 words
A device according to claim 1, wherein said homeotropic alignment film comprises a quarternary ammonium salt surfactant.
Claim 15
Dependent Claim
13 words
A device according to claim 1, wherein said homeotropic alignment film comprises lecithin.
Claim 16
Dependent Claim
14 words
A device according to claim 1, wherein said homeotropic alignment film comprises hexadecyl amine.
Claim 17
Dependent Claim
77 words
A liquid crystal display device, comprising: a pair of substrates each provided with a transparent electrode having a ferroelectric liquid crystal disposed therebetween, wherein one substrate has thereon a homogeneous alignment film provided with a uniaxial orientation treatment, and the other substrate has thereon a second alignment film obtained by coating the other substrate with an alignment film formed by oblique vapor deposition, and coating that alignment film with a homeotropic film having a uniaxial orientation treatment.
Claim 18
Dependent Claim
77 words
A liquid crystal display device, comprising: a pair of substrates each provided with a transparent electrode having a ferroelectric liquid crystal disposed therebetween, wherein one substrate has thereon a homogeneous alignment film provided with a uniaxial orientation treatment, and the other substrate has thereon a second alignment film obtained by coating the other substrate with an alignment film formed by oblique vapor deposition, and coating that alignment film with a homeotropic film having a uniaxial orientation treatment.
Claim 19
Dependent Claim
24 words
A device according to claim 16 wherein said uniaxial aligning treatment is a rubbing treatment applied to the homeotropic alignment film formed in advance.
Claim 20
Dependent Claim
29 words
A device according to claim 16, wherein said ferroelectric liquid crystal comprises a compound selected from the group consisting of Schiff's base-type, ester-type and biphenyl-type ferroelectric liquid crystal compounds.
Claim 21
Dependent Claim
33 words
A device according to claim 16, wherein said first alignment film has been obtained by coating said one substrate with an insulating film of polyimide or polyamide, and then rubbing the insulating film.
Claim 22
Dependent Claim
25 words
A device according to claim 17, wherein said second alignment film aligns liquid crystal molecules in a tilted direction with respect to the face thereof.
Claim 23
Dependent Claim
23 words
A device according to claim 20, wherein the insulating film is formed by a coating method selected from spinner coating, printing and dipping.
Claim 24
Dependent Claim
38 words
A device according to claim 16, wherein said first alignment film has been obtained by coating said one substrate with an insulating film of SiO 2 , SiO or TiO 2 , and then rubbing the insulating film.
Claim 25
Dependent Claim
27 words
A device according to claim 16, wherein said first alignment film has been obtained by oblique vapor deposition of SiO 2 , SiO or TiO 2 .
Claim 26
Dependent Claim
33 words
A device according to claim 16, wherein said first alignment film has been obtained by vapor-depositing an insulating film of SiO 2 , SiO or TiO 2 , and rubbing the insulating film.
Claim 27
Dependent Claim
19 words
A device according to claim 16, wherein said homeotropic alignment film comprises a surfactant having a fluorinated carbon chain.
Claim 28
Dependent Claim
20 words
A device according to claim 16, wherein said homeotropic alignment film comprises a silane compound having a fluorinated carbon chain.
Claim 29
Dependent Claim
17 words
A device according to claim 16, wherein said homeotropic alignment film comprises a quaternary ammonium salt surfactant.
Claim 30
Dependent Claim
13 words
A device according to claim 16, wherein said homeotropic alignment film comprises lecithin.
Claim 31
Dependent Claim
14 words
A device according to claim 16, wherein said homeotropic alignment film comprises hexadecyl amine.
Claim 32
Dependent Claim
25 words
A device according to claim 16, wherein said second alignment film aligns liquid crystal molecules in a tilted direction with respect to the face thereof.
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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) | 1992-09-25 | 1993-03-27 | 1993-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-25 | 1997-03-27 | 1997-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-25 | 2001-03-27 | 2001-09-26 | $7700.00 | Window Closed / Lapsed |