US4433900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent display liquid crystal device via voltage application
Assignee: Canon Inc
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Filing: 1981-09-21
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Granted: 1984-02-28
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Expires: 2001-09-21
Abstract
Abstract A liquid crystal display device having a layer of liquid crystals sandwiched between a pair of substrates, of which at least one substrate is transparent, is characterized in that the liquid crystal display device comprises a fixed display pattern formed by applying a voltage to said layer of liquid crystals.
Inventors
- 👤 Nobuyuki Sekimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:03
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/13725; C; C09; C09K; C09K19/00; C09K19/52; C09K19/60; G02F1/133; G04; G04G; G04G9/00; G04G9/0023; G04G9/0029; G04G9/0047
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
73 words
A liquid crystal display device having a layer of liquid crystals sandwiched between a pair of substrates of which at least one substrate is transparent, characterized in that the liquid crystal display device comprises a fixed display pattern formed by applying an effective voltage of at least about 3 volts D.C. or 10 volts A.C. for at least about 5 hours to provide a permanent orientation of said layer of said liquid crystals.
Claim 2
Dependent Claim
73 words
A liquid crystal display device having a layer of liquid crystals sandwiched between a pair of substrates of which at least one substrate is transparent, characterized in that the liquid crystal display device comprises a fixed display pattern formed by applying an effective voltage of at least about 3 volts D.C. or 10 volts A.C. for at least about 5 hours to provide a permanent orientation of said layer of said liquid crystals.
Claim 3
Dependent Claim
28 words
A liquid crystal display device according to claim 1, wherein the applied voltage for forming fixed display is of a.c. higher than a voltage for forming operation display.
Claim 4
Dependent Claim
20 words
A liquid crystal display device according to claim 1, wherein the applied voltage for forming fixed display is of d.c.
Claim 5
Dependent Claim
24 words
A liquid crystal display device according to claim 2, wherein the applied voltage for forming fixed display is at least 10 V of a.c.
Claim 6
Dependent Claim
24 words
A liquid crystal display device according to claim 4, wherein the applied voltage for forming fixed display is at least 20 V of a.c.
Claim 7
Dependent Claim
24 words
A liquid crystal display device according to claim 3, wherein the applied voltage for forming fixed display is at least 3 V of d.c.
Claim 8
Dependent Claim
24 words
A liquid crystal display device according to claim 3, wherein the applied voltage for forming fixed display is at least 10 V of d.c.
Claim 9
Dependent Claim
24 words
A liquid crystal display device according to claim 7, wherein the applied voltage for forming fixed display is at least 20 V of d.c.
Claim 10
Dependent Claim
21 words
A liquid crystal display device according to claim 1, wherein said liquid crystals are nematic liquid crystals having positive dielectric anisotropy.
Claim 11
Dependent Claim
30 words
A liquid crystal display device according to claim 9, wherein the liquid crystals surrounding those forming said fixed display pattern are those nematic in twisted alignment, having positive dielectric anisotropy.
Claim 12
Dependent Claim
39 words
A liquid crystal display device according to claim 9 or 10, wherein said liquid crystals are mix-type nematic liquid crystals having positive dielectric anisotropy, said mix-type nematic liquid crystals comprising a phenylcyclohexane-type liquid crystal and a biphenyl-cyclohexane-type liquid crystal.
Claim 13
Dependent Claim
24 words
A liquid crystal display device according to claim 9 or 10, wherein said liquid crystals are biphenyl-type nematic liquid crystals having positive dielectric anisotropy.
Claim 14
Dependent Claim
24 words
A liquid crystal display device according to claim 9 or 10, wherein said liquid crystals are those nematic of cyclohexane-type having positive dielectric anisotropy.
Claim 15
Dependent Claim
24 words
A liquid crystal display device according to claim 9 or 10, wherein said liquid crystals are those nematic of azoxy-type having positive dielectric anisotropy.
Claim 16
Dependent Claim
24 words
A liquid crystal display device according to claim 9 or 10, wherein said liquid crystals are those nematic of Shiff's-type having positive dielectric anisotropy.
Claim 17
Dependent Claim
20 words
A liquid crystal display device according to claim 9, wherein said liquid crystals are those containing a cholesteric liquid crystal.
Claim 18
Dependent Claim
20 words
A liquid crystal display device according to claim 1, wherein said liquid crystals are those containing a dichroic dye dissolved.
Claim 19
Dependent Claim
25 words
A liquid crystal display device according to claim 17, wherein said liquid are those nematic having positive dielectric anisotropy and containing a dichroic dye dissolved.
Claim 20
Dependent Claim
16 words
A liquid crystal display device according to claim 17, wherein said dichroic dye is of anthraquinone-type.
Claim 21
Dependent Claim
16 words
A liquid crystal display device according to claim 17, wherein said dichroic dye is of azo-type.
Claim 22
Dependent Claim
30 words
A liquid crystal display device according to claim 18, wherein the liquid crystals surrounding those forming said fixed display pattern are those nematic in twisted alignment, having positive dielectric anisotropy.
Claim 23
Dependent Claim
30 words
A liquid crystal display device according to claim 18, wherein the liquid crystals surrounding those forming said fixed display pattern are those nematic in homogeneous alignment, having positive dielectric anisotropy.
Claim 24
Dependent Claim
36 words
A liquid crystal display device according to claim 21 or 22, wherein said liquid crystals are mix-type nematic liquid crystals having positive dielectric anisotropy, which comprise a phenylcyclohexane-type liquid crystal and a biphenylcyclohexane-type liquid crystal compound.
Claim 25
Dependent Claim
24 words
A liquid crystal display device according to claim 21 or 22, wherein said liquid crystals are biphenyl-type nematic liquid crystals having positive dielectric anisotropy.
Claim 26
Dependent Claim
25 words
A liquid crystal display device according to claim 21 or 22, wherein said liquid crystals are those nematic of cyclohexane group, having positive dielectric anisotropy.
Claim 27
Dependent Claim
24 words
A liquid crystal display device according to claim 21 or 22, wherein said liquid crystals are azoxy-type nematic liquid crystals having positive dielectric anisotropy.
Claim 28
Dependent Claim
25 words
A liquid crystal display device according to claim 21 or 22, wherein said liquid crystals are Shiff's base-type nematic liquid crystals having positive dielectric anisotropy.
Claim 29
Dependent Claim
20 words
A liquid crystal display device according to claim 17, wherein said liquid crystals are those containing a cholesteric liquid crystal.
Claim 30
Dependent Claim
20 words
A liquid crystal display device according to claim 17, wherein said liquid crystals are those nematic having negative dielectric anisotropy.
Claim 31
Dependent Claim
26 words
A liquid crystal display device according to claim 29, wherein said liquid crystals are those nematic having negative dielectric anisotropy and containing an anthraquinone dye dissolved.
Claim 32
Dependent Claim
25 words
A liquid crystal display device according to claim 29, wherein said liquid crystals are those nematic having negative dielectric anisotropy and containing an azo-dye dissolved.
Claim 33
Dependent Claim
22 words
A liquid crystal display device according to claim 29, wherein said liquid crystal are azo-type nematic liquid crystals having negative dielectric anisotropy.
Claim 34
Dependent Claim
22 words
A liquid crystal display device according to claim 29, wherein said liquid crystals are benzylideneaniline-type nematic liquid crystal having negative dielectric anisotropy.
Claim 35
Dependent Claim
16 words
A liquid crystal display device according to claim 1, wherein said liquid crystals are of pleochroic.
Claim 36
Dependent Claim
20 words
A liquid crystal display device according to claim 34, wherein said liquid crystals are those pleochroic having positive dielectric anisotropy.
Claim 37
Dependent Claim
20 words
A liquid crystal display device according to claim 34, wherein said liquid crystals are those pleochroic having negative dielectric anisotropy.
Claim 38
Dependent Claim
27 words
A liquid crystal display device according to any of claims 10, 21 and 22, wherein each of said conductive coatings is provided with an orienting film thereon.
Claim 39
Dependent Claim
38 words
A liquid crystal display device according to claim 37, wherein said orienting films are of an organic material selected from the group consisting of polyimides, poly (benzoxazole), poly (benzothiazole), poly (benzimidazole), poly (p-xylylene), polyolefins, poly (fluoroethylenes), and polyesters.
Claim 40
Dependent Claim
17 words
A liquid crystal display device according to claim 37, wherein said orienting films are of silicon dioxide.
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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) | 1987-02-27 | 1987-08-29 | 1988-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-27 | 1991-08-29 | 1992-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-27 | 1995-08-29 | 1996-02-28 | $7700.00 | Window Closed / Lapsed |