Patent US1464393A successfully refreshed from Google Patents.
Patent US4796979A successfully refreshed from Google Patents.
US4796979A
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Ferroelectric liquid crystal device having dual laminated alignment films
Assignee: Canon Inc
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Filing: 1987-04-03
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Granted: 1989-01-10
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Expires: 2007-04-03
Abstract
Abstract A ferroelectric liquid crystal device comprises: a pair of substrates, and a ferroelectric liquid crystal layer disposed between the substrates. At least one substrate is provided with an alignment control layer. The alignment control layer comprises at least two laminated alignment films of mutually different materials. An alignment film disposed on the substrate side preferably has a property of orienting the polarization direction of ferroelectric liquid crystal molecules toward the liquid crystal layer or is a homogeneous orientation power. An alignment film disposed on the liquid crystal side preferably has a property of orienting the polarization direction toward the alignment control layer or has a homeotropic alignment power.
Inventors
- 👤 Akira Tsuboyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:48
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711
Claims Analysis
Total Claims: 61
Claim 1
Independent Claim
46 words
A ferroelectric liquid crystal device, comprising: a pair of substrates, and a ferroelectric liquid crystal layer disposed between the substrates; at least one substrate being provided with an alignment control layer, the alignment control layer comprising at least two laminated alignment films of mutually different materials.
Claim 2
Dependent Claim
46 words
A ferroelectric liquid crystal device, comprising: a pair of substrates, and a ferroelectric liquid crystal layer disposed between the substrates; at least one substrate being provided with an alignment control layer, the alignment control layer comprising at least two laminated alignment films of mutually different materials.
Claim 3
Dependent Claim
41 words
A device according to claim 1, wherein said ferroelectric liquid crystal has at least a first stable state and a second stable state and has a memory effect of retaining the respective stable states in the absence of an electric field.
Claim 4
Dependent Claim
17 words
A device according to claim 1, wherein said ferroelectric liquid crystal is a chiral smectic liquid crystal.
Claim 5
Dependent Claim
104 words
A ferroelectric liquid crystal device, comprising: a pair of substrates, and a ferroelectric liquid crystal layer disposed between the substrates; at least one substrate being provided with an alignment control layer, the alignment control layer comprising a laminated structure of: (A) an alignment film A having a property of orienting the polarization direction of ferroelectric liquid crystal molecules in the vicinity of the alignment control layer toward the alignment control layer, and (B) an alignment film B having a property of orienting the polarization" direction of ferroelectric liquid crystal molecules .n& the vicinity of the alignment control layer toward the ferroelectric liquid crystal layer.
Claim 6
Dependent Claim
104 words
A ferroelectric liquid crystal device, comprising: a pair of substrates, and a ferroelectric liquid crystal layer disposed between the substrates; at least one substrate being provided with an alignment control layer, the alignment control layer comprising a laminated structure of: (A) an alignment film A having a property of orienting the polarization direction of ferroelectric liquid crystal molecules in the vicinity of the alignment control layer toward the alignment control layer, and (B) an alignment film B having a property of orienting the polarization" direction of ferroelectric liquid crystal molecules .n& the vicinity of the alignment control layer toward the ferroelectric liquid crystal layer.
Claim 7
Dependent Claim
41 words
A device according to claim 4, wherein said ferroelectric liquid crystal has at least a first stable state and a second stable state and has a memory effect of retaining the respective stable states in the absence of an electric field.
Claim 8
Dependent Claim
17 words
A device according to claim 4, wherein said ferroelectric liquid crystal is a chiral smectic liquid crystal.
Claim 9
Dependent Claim
16 words
A device according to claim 4, wherein said alignment film A comprises a silane coupling agent.
Claim 10
Dependent Claim
16 words
A device according to claim 4, wherein said alignment film B comprises a polyimide type polymer.
Claim 11
Dependent Claim
17 words
A device according to claim 4, wherein said alignment film B comprises a polyvinyl alcohol type polymer.
Claim 12
Dependent Claim
19 words
A device according to claim 4, wherein said alignment film A has a thickness of 20 to 3000 Å.
Claim 13
Dependent Claim
19 words
A device according to claim 4, wherein said alignment film A has a thickness of 50 to 2000 Å.
Claim 14
Dependent Claim
19 words
A device according to claim 4, wherein said alignment film B has a thickness of 20 to 3000 Å.
Claim 15
Dependent Claim
19 words
A device according to claim 4, wherein said alignment film B has a thickness of 50 to 2000 Å.
Claim 16
Dependent Claim
20 words
A device according to claim 4, which further comprises an insulating layer between the substrate and the alignment control layer.
Claim 17
Dependent Claim
25 words
A device according to claim 4, wherein said alignment control layer has a double-layered structure of the alignment film A and the alignment film B.
Claim 18
Dependent Claim
34 words
A device according to claim 15, wherein the alignment film A in the double-layered structure is disposed on the ferroelectric liquid crystal side and the alignment film B is disposed on the substrate side.
Claim 19
Dependent Claim
133 words
A ferroelectric liquid crystal device, comprising: a pair of substrates each having an alignment control layer thereof, and a ferroelectric liquid crystal disposed between the substrates; one of the alignment control layers comprising either a single layer of a laminated structure of the following alignment films A and B, and the other of the alignment control layers comprising a laminated structure of the following alignment films A and B: (A) an alignment film A having a property of orienting the polarization direction of ferroelectric liquid crystal molecules n the vicinity of the alignment control layer toward the alignment control layer, and (B) an alignment film B having a property of orienting the polarization direction of ferroelectric liquid crystal molecules in the vicinity of the alignment control layer toward the ferroelectric liquid crystal layer:
Claim 20
Dependent Claim
133 words
A ferroelectric liquid crystal device, comprising: a pair of substrates each having an alignment control layer thereof, and a ferroelectric liquid crystal disposed between the substrates; one of the alignment control layers comprising either a single layer of a laminated structure of the following alignment films A and B, and the other of the alignment control layers comprising a laminated structure of the following alignment films A and B: (A) an alignment film A having a property of orienting the polarization direction of ferroelectric liquid crystal molecules n the vicinity of the alignment control layer toward the alignment control layer, and (B) an alignment film B having a property of orienting the polarization direction of ferroelectric liquid crystal molecules in the vicinity of the alignment control layer toward the ferroelectric liquid crystal layer:
Claim 21
Dependent Claim
41 words
A device according to claim 17, wherein said ferroelectric liquid crystal has at least a first stable state and a second stable state and has a memory effect of retaining the respective stable states in the absence of an electric field.
Claim 22
Dependent Claim
17 words
A device according to claim 17, wherein said ferroelectric liquid crystal is a chiral smectic liquid crystal.
Claim 23
Dependent Claim
16 words
A device according to claim 17, wherein said alignment film A comprises a silane coupling agent.
Claim 24
Dependent Claim
16 words
A device according to claim 17, wherein said alignment film B comprises a polyimide type polymer.
Claim 25
Dependent Claim
17 words
A device according to claim 17, wherein said alignment film B comprises a polyvinyl alcohol type polymer.
Claim 26
Dependent Claim
19 words
A device according to claim 17, wherein said alignment film A has a thickness of 20 to 3000 Å.
Claim 27
Dependent Claim
19 words
A device according to claim 17, wherein said alignment film A has a thickness of 50 to 2000 Å.
Claim 28
Dependent Claim
19 words
A device according to claim 17, wherein said alignment film B has a thickness of 20 to 3000 Å.
Claim 29
Dependent Claim
19 words
A device according to claim 17, wherein said alignment film B has a thickness of 50 to 2000 Å.
Claim 30
Dependent Claim
20 words
A device according to claim 17, which further comprises an insulating layer between the substrate and the alignment control layer.
Claim 31
Dependent Claim
34 words
A device according to claim 17, wherein the alignment film A in the double-layered structure is disposed on the ferroelectric liquid crystal side and the alignment film B is disposed on the substrate side.
Claim 32
Dependent Claim
93 words
A ferroelectric liquid crystal device, comprising: a pair of substrates, and a ferroelectric liquid crystal layer disposed between the substrates; at least one substrate being provided with an alignment control layer, the alignment control layer comprising a combination of: (C) an alignment film C having a homogeneous alignment power of aligning the longer axis of a ferroelectric liquid crystal molecule in substantially parallel with the substrate, and (D) an alignment film D having a homeotropic alignment power of aligning the longer axis of a ferroelectric liquid crystal in substantially vertically to the substrate.
Claim 33
Dependent Claim
93 words
A ferroelectric liquid crystal device, comprising: a pair of substrates, and a ferroelectric liquid crystal layer disposed between the substrates; at least one substrate being provided with an alignment control layer, the alignment control layer comprising a combination of: (C) an alignment film C having a homogeneous alignment power of aligning the longer axis of a ferroelectric liquid crystal molecule in substantially parallel with the substrate, and (D) an alignment film D having a homeotropic alignment power of aligning the longer axis of a ferroelectric liquid crystal in substantially vertically to the substrate.
Claim 34
Dependent Claim
41 words
A device according to claim 29, wherein said ferroelectric liquid crystal has at least a first stable state and a second stable state and has a memory effect of retaining the respective stable states in the absence of an electric field.
Claim 35
Dependent Claim
17 words
A device according to claim 29, wherein said ferroelectric liquid crystal is a chiral smectic liquid crystal.
Claim 36
Dependent Claim
46 words
A device according to claim 29, wherein said alignment film C comprises an organic material selected from the group consisting of polyimide, polyamideimide, polyesterimide, polyparaxylylene, polyester, polycarbonate, polyvinyl acetal, polyvinyl chloride, polyvinyl acetate, polyamide, polystyrene, cellulose resin, melamine resin, urea resin, acrylic resin, and photoresist resin.
Claim 37
Dependent Claim
28 words
A device according to claim 29, wherein said alignment film C comprises an inorganic material selected from the group consisting of SiO, SiO 2 and TiO 2 .
Claim 38
Dependent Claim
16 words
A device according to claim 29, wherein said alignment film D comprises a silane coupling agent.
Claim 39
Dependent Claim
19 words
A device according to claim 29, wherein said alignment film C has a thickness of 20 to 3000 Å.
Claim 40
Dependent Claim
19 words
A device according to claim 29, wherein said alignment film C has a thickness of 50 to 2000 Å.
Claim 41
Dependent Claim
19 words
A device according to claim 29, wherein said alignment film D has a thickness of 20 to 3000 Å.
Claim 42
Dependent Claim
19 words
A device according to claim 29, wherein said alignment film D has a thickness of 50 to 2000 Å.
Claim 43
Dependent Claim
20 words
A device according to claim 29, which further comprises an insulating layer between the substrate and the alignment control layer.
Claim 44
Dependent Claim
25 words
A device according to claim 29, wherein said alignment control layer has a double-layered structure of the alignment film C and the alignment film D.
Claim 45
Dependent Claim
34 words
A device according to claim 40, wherein the alignment film D in the double-layered structure is disposed on the ferroelectric liquid crystal side and the alignment film C is disposed on the substrate side.
Claim 46
Dependent Claim
117 words
A ferroelectric liquid crystal device, comprising: a pair of substrates each having an alignment control layer thereon, and a ferroelectric liquid crystal disposed between the substrates; one of the alignment control layers comprising either one or both of the following alignment films C and D, and the other of the alignment control layers comprising both of the following alignment films C and D: (C) an alignment film C having a homogeneous alignment power of aligning the longer axis of a ferroelectric liquid crystal molecule in substantially parallel with the substrate, and (D) an alignment film D having a homeotropic alignment power of aligning the longer axis of a ferroelectric liquid crystal in substantially vertically to the substrate.
Claim 47
Dependent Claim
117 words
A ferroelectric liquid crystal device, comprising: a pair of substrates each having an alignment control layer thereon, and a ferroelectric liquid crystal disposed between the substrates; one of the alignment control layers comprising either one or both of the following alignment films C and D, and the other of the alignment control layers comprising both of the following alignment films C and D: (C) an alignment film C having a homogeneous alignment power of aligning the longer axis of a ferroelectric liquid crystal molecule in substantially parallel with the substrate, and (D) an alignment film D having a homeotropic alignment power of aligning the longer axis of a ferroelectric liquid crystal in substantially vertically to the substrate.
Claim 48
Dependent Claim
41 words
A device according to claim 29, wherein said ferroelectric liquid crystal has at least a first stable state and a second stable state and has a memory effect of retaining the respective stable states in the absence of an electric field.
Claim 49
Dependent Claim
17 words
A device according to claim 42, wherein said ferroelectric liquid crystal is a chiral smectic liquid crystal.
Claim 50
Dependent Claim
46 words
A device according to claim 42, wherein said alignment film C comprises an organic material selected from the group consisting of polyimide, polyamideimide, polyesterimide, polyparaxylylene, polyester, polycarbonate, polyvinyl acetate, polyvinyl chloride, polyvinyl acetate, polyamide, polystyrene, cellulose resin, melamine resin, urea resin, acrylic resin, and photoresist resin.
Claim 51
Dependent Claim
28 words
A device according to claim 42, wherein said alignment film C comprises an inorganic material selected from the group consisting of SiO, SiO 2 and TiO 2 .
Claim 52
Dependent Claim
16 words
A device according to claim 42, wherein said alignment film D comprises a silane coupling agent.
Claim 53
Dependent Claim
19 words
A device according to claim 42, wherein said alignment film C has a thickness of 20 to 3000 Å.
Claim 54
Dependent Claim
19 words
A device according to claim 42, wherein said alignment film C has a thickness of 50 to 2000 Å.
Claim 55
Dependent Claim
19 words
A device according to claim 42, wherein said alignment film D has a thickness of 20 to 3000 Å.
Claim 56
Dependent Claim
19 words
A device according to claim 42, wherein said alignment film D has a thickness of 50 to 2000 Å.
Claim 57
Dependent Claim
20 words
A device according to claim 42, which further comprises an insulating layer between the substrate and the alignment control layer.
Claim 58
Dependent Claim
34 words
A device according to claim 42, wherein the alignment film D in the double-layered structure is disposed on the ferroelectric liquid crystal side and the alignment film C is disposed on the substrate side.
Claim 59
Dependent Claim
49 words
A ferroelectric liquid crystal device, comprising: a pair of substrates, and a ferroelectric liquid crystal layer disposed between the substrates; at least one substrate being provided with an alignment control layer, the alignment control layer comprising two laminated alignment films of mutually different materials and of mutually different thicknesses.
Claim 60
Dependent Claim
49 words
A ferroelectric liquid crystal device, comprising: a pair of substrates, and a ferroelectric liquid crystal layer disposed between the substrates; at least one substrate being provided with an alignment control layer, the alignment control layer comprising two laminated alignment films of mutually different materials and of mutually different thicknesses.
Claim 61
Dependent Claim
29 words
A device according to claim 54, wherein one of the two alignment films disposed on the substrate side has a thickness larger than that of the other alignment film.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |