US4357374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Guest-host liquid crystal display devices with silane surfactant
Assignee: AGC Inc
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Filing: 1980-12-02
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Granted: 1982-11-02
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Expires: 2000-12-02
Abstract
Abstract A guest-host liquid crystal display device has tilted homeotropic orientation using a nematic liquid crystal having negative dielectric anisotropy as a host and a dichroic dye as a guest which is prepared by overcoating an inorganic insulating layer; treating said layer to provide orientation; and treating the layer with a silane surfactant.
Inventors
- 👤 Shoichi Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:06
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/13725; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; G02F1/133719; C; C09; C09K; C09K2323/00; C09K2323/02; C09K2323/023; C09K2323/03; C09K2323/033; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/261; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/269; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
100 words
A guest-host liquid crystal display device having tilted homeotropic orientation using a nematic liquid crystal having negative dielectric anisotropy as a host and a dichroic dye as guest which is prepared by placing the nematic liquid crystal between two glass plates, each of the glass plates, on the surface facing the nematic liquid crystal, having an electrode thereon; said electrode having been coated with an inorganic insulating layer; said inorganic insulating layer having been treated to provide orientation by being rubbed or polished in a single direction; and coating the so-treated layer with a silane surfactant which imparts homeotropic orientation.
Claim 2
Dependent Claim
100 words
A guest-host liquid crystal display device having tilted homeotropic orientation using a nematic liquid crystal having negative dielectric anisotropy as a host and a dichroic dye as guest which is prepared by placing the nematic liquid crystal between two glass plates, each of the glass plates, on the surface facing the nematic liquid crystal, having an electrode thereon; said electrode having been coated with an inorganic insulating layer; said inorganic insulating layer having been treated to provide orientation by being rubbed or polished in a single direction; and coating the so-treated layer with a silane surfactant which imparts homeotropic orientation.
Claim 3
Dependent Claim
55 words
The guest-host liquid crystal display device according to claim 1 wherein said inorganic insulating layer is a made of TiO 2 , ZrO 2 , HfO 2 , GeO 2 , SiO 2 , Al 2 O 3 , CeO 2 , CaF 2 or MgF 2 in a thickness of more than 300 A.
Claim 4
Dependent Claim
25 words
The guest-host liquid crystal display device according to claim 2 wherein said orientation is given by a rubbing or polishing treatment in a non-vacuum process.
Claim 5
Dependent Claim
47 words
The guest-host liquid crystal display device according to claim 3 wherein said silane surfactant is an organic silane compound having the formula R-SiX.sub.3 wherein R represents a C 10 -C 20 alkyl group or fluorinated alkyl group; and X represents a halogen atom or an alkoxy group.
Claim 6
Dependent Claim
46 words
The guest-host liquid crystal display device according to claim 4 wherein said silane surfactant is an organic silane compound having the formula R'-SiX.sub.3 wherein R' represents a C 16 -C 20 alkyl or fluorinated alkyl group; and X represents a halogen atom or an alkoxy group.
Claim 7
Dependent Claim
26 words
The guest-host liquid crystal display device according to claim 2 wherein said inorganic insulating layer is made of ZrO 2 or Al 2 O 3 .
Claim 8
Dependent Claim
21 words
The guest-host liquid crystal display device according to claim 6 wherein said inorganic insulating layer is made of ZrO 2 .
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) | 1985-11-01 | 1986-05-03 | 1986-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-01 | 1990-05-03 | 1990-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-01 | 1994-05-03 | 1994-11-02 | $7700.00 | Window Closed / Lapsed |