US4729637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display device having colored layer containing polyazo compound
Assignee: Canon Inc
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Filing: 1986-12-01
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Granted: 1988-03-08
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Expires: 2006-12-01
Abstract
Abstract A liquid crystal display device having a pair of opposing substrates, conductive films provided on the substrates, and a liquid crystal filled between the opposing substrates. The device has a colored layer containing a polyazo compound and provided on at least one of the substrates.
Inventors
- 👤 Yasufumi Sato
- 👤 Yoshiyuki Nakura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:53
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133509; G02F1/133514; C; C09; C09K; C09K19/00; C09K19/52; C09K19/60; C09K19/601; C09K2323/00; C09K2323/03; C09K2323/031
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
44 words
A liquid crystal display device having a pair of opposing substrates, conductive films provided on said substrates, and a liquid crystal filled between the opposing substrates, comprising a colored layer containing a polyazo compound and being provided on at least one of said substrates.
Claim 2
Dependent Claim
44 words
A liquid crystal display device having a pair of opposing substrates, conductive films provided on said substrates, and a liquid crystal filled between the opposing substrates, comprising a colored layer containing a polyazo compound and being provided on at least one of said substrates.
Claim 3
Dependent Claim
17 words
A liquid crystal display device according to claim 1, wherein said polyazo compound is a tetrazo compound.
Claim 4
Dependent Claim
24 words
A liquid crystal display device according to claim 2, wherein said tetrazo compound has at least 2 to 8 sulfo groups in its molecule.
Claim 5
Dependent Claim
102 words
A liquid crystal display device according to claim 2, wherein said polyazo compound is a dye which is represented by the following general formula (A) and which has 2 to 8 sulfo groups per molecule, ##STR5## where, Q 1 and Q 2 represent a benzene ring or naphthalene ring which may be substituted by an amino group, a hydroxyl group or a sulfo group, R 1 to R 6 independently represent one of a hydrogen atom, an amino group, a hydroxyl group and a sulfo group, and the sulfo group may take the form of sodium salt, or a quaternary ammonium salt.
Claim 6
Dependent Claim
16 words
A liquid crystal display device according to claim 1, wherein said colored layer comprises polyvinyl alcohol.
Claim 7
Dependent Claim
15 words
A liquid crystal display device according to claim 1, wherein said colored layer comprises gelatin.
Claim 8
Dependent Claim
18 words
A liquid crystal display device according to claim 1, wherein said colored layer comprises an acrylic acid resin.
Claim 9
Dependent Claim
27 words
A liquid crystal display device according to claim 1, wherein the content of said polyazo compound in said colored layer ranges between 1 and 50% by weight.
Claim 10
Dependent Claim
20 words
A liquid crystal display device according to claim 1, further comprising an orientation control film formed on said colored layer.
Claim 11
Dependent Claim
20 words
A liquid crystal display device according to claim 9, wherein said orientation control film was a uniaxial orientation treatment axis.
Claim 12
Dependent Claim
19 words
A liquid crystal display device according to claim 10, wherein said uniaxial orientation treatment axis is rubbing treatment axis.
Claim 13
Dependent Claim
34 words
A liquid crystal display device according to claim 9, wherein said orientation control film is formed of at least one resin selected from the group consisting of polyvinyl alcohol, polyimide, polyesterimide, polyamideimide and polyamide.
Claim 14
Dependent Claim
32 words
A liquid crystal display device according to claim 9, wherein said orientation control film is formed of a polyvinyl alcohol which has been cured in the presence of an organic titanate compound.
Claim 15
Dependent Claim
19 words
A liquid crystal display device according to claim 1, wherein said liquid crystal is a twisted nematic liquid crystal.
Claim 16
Dependent Claim
18 words
A liquid crystal display device according to claim 1, wherein said liquid crystal is a ferroelectric liquid crystal.
Claim 17
Dependent Claim
20 words
A liquid crystal display device according to claim 15, wherein said ferroelectric liquid crystal is a chiral smectic liquid crystal.
Claim 18
Dependent Claim
33 words
A liquid crystal display device according to claim 16, wherein said chiral smectic liquid crystal has a thickness which is small enough to extinguish the spiral structure of the chiral smectic liquid crystal.
Claim 19
Dependent Claim
25 words
A liquid crystal display device according to claim 1, wherein said colored layer has sensitivity to light at the time of formation of said film.
Claim 20
Dependent Claim
22 words
A liquid crystal display device according to claim 1, wherein said colored layer is provided between said substrate and said conductive film.
Claim 21
Dependent Claim
23 words
A liquid crystal display device according to claim 1, wherein said colored layer is provided on the outer surface of said conductive 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) | 1991-03-08 | 1991-09-07 | 1992-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-08 | 1995-09-07 | 1996-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-08 | 1999-09-07 | 2000-03-08 | $7700.00 | Window Closed / Lapsed |