Patent US5239398A successfully refreshed from Google Patents.
US5239398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal device with phenylenevinylene or phenylene sulfide alignment films having particular high electrical conductivity
Assignee: Canon Inc
•
Filing: 1991-03-12
•
Granted: 1993-08-24
•
Expires: 2011-03-12
Abstract
Abstract A liquid crystal device comprises a pair of opposing substrates and a liquid crystal rendering a chiral smectic phase, disposed between said pair of substrates, wherein at least one of the substrates is provided with an alignment film comprising a polymer containing a skeleton selected from the group consisting of acetylene, phenylene, phenylenevinylene, phenylenexylidene, benzyl, phenylene sulfide, dimethylparaphenylene sulfide, thienylene, furan, selenophene, vinylpyridine, vinylnaphthalene, vinylferrocene, vinylcarbazole, phenylene oxide, phenylene selenide, heptadiyne, benzothiophene, thiophene, pyrrole, aniline and naphthylene. The liquid crystal device is used for a display system and effects a high contrast display without after-image.
Inventors
- 👤 Yoshihiro Yanagisawa
- 👤 Hiroshi Matsuda
- 👤 Hideyuki Kawagishi
- 👤 Ken Eguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:29
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/2021; C09K2019/2035; C09K2019/2042; C09K2323/00; C09K2323/02; C09K2323/06; C09K2323/061
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
63 words
A liquid crystal device, comprising: a pair of opposing substrates; and a liquid crystal rendering a chiral smectic phase disposed between said pair of substrates, at least one of said substrates having an alignment film that exhibits an electrical conductivity of at least 10 -8 Ω -1 cm -1 ; said alignment film comprising a polymer having a phenylenevinylene or phenylene sulfide skeleton.
Claim 2
Dependent Claim
63 words
A liquid crystal device, comprising: a pair of opposing substrates; and a liquid crystal rendering a chiral smectic phase disposed between said pair of substrates, at least one of said substrates having an alignment film that exhibits an electrical conductivity of at least 10 -8 Ω -1 cm -1 ; said alignment film comprising a polymer having a phenylenevinylene or phenylene sulfide skeleton.
Claim 3
Dependent Claim
18 words
A liquid crystal device according to claim 1, wherein said alignment film is formed according to Langmuir-Blodgett process.
Claim 4
Dependent Claim
18 words
A liquid crystal device according to claim 2, wherein said alignment film has a thickness of 4-80 Å.
Claim 5
Dependent Claim
17 words
A liquid crystal device according to claim 1, wherein said alignment film has been subjected to rubbing.
Claim 6
Dependent Claim
49 words
A liquid crystal device according to claim 1, wherein said pair of substrates are disposed with a space corresponding to the thickness of a liquid crystal layer so that the liquid crystal layer may have a thickness in which the spiral structure of liquid crystal molecules has come loose.
Claim 7
Dependent Claim
21 words
A liquid crystal device according to claim 1, wherein an insulating layer is provided between said substrate and said alignment film.
Claim 8
Dependent Claim
24 words
A liquid crystal device according to claim 6, wherein said insulating layer comprises SiO 2 , TiO 2 or Ta 2 O 5 .
Claim 9
Dependent Claim
34 words
A display system, comprising: a display panel comprising a liquid crystal device according to claim 1; and communication synchronizing means for generating image information and transferring said image information to said liquid crystal device.
Claim 10
Dependent Claim
18 words
A display system according to claim 8, which further comprises a drive circuit for said liquid crystal device.
Claim 11
Dependent Claim
21 words
A display system according to claim 9, wherein said drive circuit is a drive circuit driven in an active matrix constitution.
Claim 12
Dependent Claim
13 words
A display system according to claim 10, which further comprises a light source.
Claim 13
Dependent Claim
99 words
A liquid crystal device, comprising: a pair of opposing substrates and a liquid crystal rendering a chiral smectic phase disposed between said pair of substrates, wherein at least one of said substrates is provided with an alignment film that exhibits an electrical conductivity of greater than 10 -3 Ω -1 cm -1 , said alignment film comprising a polymer having a phenylenevinylene or phenylene sulfide skeleton and wherein an insulating layer comprising a material selected from the group consisting of SiO 2 , TiO 2 and Ta 2 O 5 is provided between said substrate and said alignment film.
Claim 14
Dependent Claim
99 words
A liquid crystal device, comprising: a pair of opposing substrates and a liquid crystal rendering a chiral smectic phase disposed between said pair of substrates, wherein at least one of said substrates is provided with an alignment film that exhibits an electrical conductivity of greater than 10 -3 Ω -1 cm -1 , said alignment film comprising a polymer having a phenylenevinylene or phenylene sulfide skeleton and wherein an insulating layer comprising a material selected from the group consisting of SiO 2 , TiO 2 and Ta 2 O 5 is provided between said substrate and said alignment film.
Claim 15
Dependent Claim
18 words
A liquid crystal device according to claim 12, wherein said alignment film is formed by a Langmuir-Blodgett method.
Claim 16
Dependent Claim
18 words
A liquid crystal device according to claim 13, wherein said alignment film has a thickness of 4-80 Å.
Claim 17
Dependent Claim
15 words
A liquid crystal device according to claim 12, wherein said alignment film has been rubbed.
Claim 18
Dependent Claim
17 words
A liquid crystal device according to claim 12, wherein said alignment film is a rubbed coating film.
Claim 19
Dependent Claim
121 words
A display system, comprising: a liquid crystal device comprising a pair of opposing substrates and a liquid crystal rendering a chiral smectic phase disposed between said pair of substrates; and communication synchronizing means for generating image information and transferring said image information to said liquid crystal device, wherein at least one of said substrates is provided with an alignment film that exhibits an electrical conductivity of greater than 10 -8 Ω -1 cm -1 , said alignment film comprising a polymer having a phenylenevinylene or phenylene sulfide skeleton; and wherein an insulating layer comprising a material selected from the group consisting of SiO 2 , TiO 2 and Ta 2 O 5 is provided between said substrate and said alignment film.
Claim 20
Dependent Claim
121 words
A display system, comprising: a liquid crystal device comprising a pair of opposing substrates and a liquid crystal rendering a chiral smectic phase disposed between said pair of substrates; and communication synchronizing means for generating image information and transferring said image information to said liquid crystal device, wherein at least one of said substrates is provided with an alignment film that exhibits an electrical conductivity of greater than 10 -8 Ω -1 cm -1 , said alignment film comprising a polymer having a phenylenevinylene or phenylene sulfide skeleton; and wherein an insulating layer comprising a material selected from the group consisting of SiO 2 , TiO 2 and Ta 2 O 5 is provided between said substrate and said alignment film.
Claim 21
Dependent Claim
18 words
A display system according to claim 17, which further comprises a drive circuit for said liquid crystal device.
Claim 22
Dependent Claim
21 words
A display system according to claim 18, wherein said drive circuit is a drive circuit driven in an active matrix constitution.
Claim 23
Dependent Claim
13 words
A display system according to claim 19, which further comprising a light source.
Claim 24
Dependent Claim
82 words
A display method, comprising the steps of: selecting a liquid crystal device comprising a pair of opposing substrates and a liquid crystal rendering a chiral smectic phase disposed between said pair of substrates, wherein at least one of said substrates is provided with an alignment film that exhibits an electrical conductivity of at least 10 -8 Ω -1 cm -1 ; said alignment film comprising a polymer having a phenylenevinylene or phenylene sulfide skeleton; and displaying information by driving said liquid crystal.
Claim 25
Dependent Claim
82 words
A display method, comprising the steps of: selecting a liquid crystal device comprising a pair of opposing substrates and a liquid crystal rendering a chiral smectic phase disposed between said pair of substrates, wherein at least one of said substrates is provided with an alignment film that exhibits an electrical conductivity of at least 10 -8 Ω -1 cm -1 ; said alignment film comprising a polymer having a phenylenevinylene or phenylene sulfide skeleton; and displaying information by driving said liquid crystal.
Claim 26
Dependent Claim
28 words
A display method according to claim 21, comprising the further step of selecting a liquid crystal device wherein said alignment film is formed according to a Langmuir-Blodgett process.
Claim 27
Dependent Claim
18 words
A liquid crystal device according to claim 22, wherein said alignment film has a thickness of 4-80 Å.
Claim 28
Dependent Claim
27 words
A display method according to claim 21, wherein said alignment film is formed according to a Langmuir-Blodgett process; wherein said alignment film has been subjected to rubbing.
Claim 29
Dependent Claim
59 words
A display method according to claim 21, wherein said alignment film is formed according to a Langmuir-Blodgett process; wherein said pair of substrates are disposed with a space corresponding to the thickness of a liquid crystal layer so that the liquid crystal layer may have a thickness in which the spiral structure of liquid crystal molecules has come loose.
Claim 30
Dependent Claim
20 words
A display method according to claim 25, wherein the display is carried out by electrically driving said liquid crystal molecules.
Claim 31
Dependent Claim
23 words
A display method according to claim 26, wherein said driving is carried out using a drive circuit driven in an active matrix constitution.
Claim 32
Dependent Claim
21 words
A liquid crystal device according to claim 21, wherein an insulating layer is provided between said substrate and said alignment film.
Claim 33
Dependent Claim
24 words
A liquid crystal device according to claim 28, wherein said insulating layer comprises SiO 2 , TiO 2 or Ta 2 O 5 .
References Cited (Backward Citations)
JPS5570815A
Cited
JPS56107216A
Cited
US4367924A
Cited
US4655561A
Cited
US4561726A
Cited
US4883344A
Cited
US5009489A
Cited
US4939003A
Cited
JPS6449023A
Cited
US5046822A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-23 | 1997-02-22 | 1997-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-23 | 2001-02-22 | 2001-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-23 | 2005-02-22 | 2005-08-24 | $7700.00 | Window Closed / Lapsed |