US3994567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-optical cell for field effect type liquid crystal display
Assignee: Dai Nippon Printing Co Ltd
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Filing: 1975-11-28
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Granted: 1976-11-30
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Expires: 1995-11-28
Abstract
Abstract An electro-optical cell comprises, on an optical path, a pair of electrode base plates and a nematic liquid crystal material having a positive dielectric anisotropy and sandwiched between the electrode base plates, each of which comprises a transparent base plate having an inner surface, an electrode film provided on the inner surface, and a polyimide resin film orientated in one direction and provided on the inner surface over the electrode film, the electrode base plates being mutually disposed on opposite sides of the liquid crystal material with their respective polyimide resin films on their inner sides in mutually facing state with the orientated direction of one polyimide resin film intersecting that of the other as viewed along the optical path. An advantageous feature of this electro-optical cell is that the electrode base plates thereof has durable and heat-resistant orientation which can impart a uniform, initial alignment of ample strength to the liquid crystal.
Inventors
- 👤 Makoto Matsuo
- 👤 Takashi Toida
- 👤 Ichiro Tsunoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:01
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/54; C09K19/56; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; G02F1/133723; C09K2323/00; C09K2323/02; C09K2323/027
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
119 words
An electro-optical cell for field effect type liquid crystal display comprising, on an optical path: a pair of electrode base plates each comprising a transparent base plate having an inner surface, an electrode film provided on said inner surface, and a polyimide resin film provided on said inner surface over the electrode film, and orientated in one direction, the electrode base plates being mutually disposed with their respective polyimide resin films on their inner sides in mutually facing state and with the orientated direction of one polyimide resin film intersecting that of the other as viewed along the optical path; and a nematic liquid crystal material having a positive dielectric anisotropy and interposed between the two electrode base plates.
Claim 2
Dependent Claim
119 words
An electro-optical cell for field effect type liquid crystal display comprising, on an optical path: a pair of electrode base plates each comprising a transparent base plate having an inner surface, an electrode film provided on said inner surface, and a polyimide resin film provided on said inner surface over the electrode film, and orientated in one direction, the electrode base plates being mutually disposed with their respective polyimide resin films on their inner sides in mutually facing state and with the orientated direction of one polyimide resin film intersecting that of the other as viewed along the optical path; and a nematic liquid crystal material having a positive dielectric anisotropy and interposed between the two electrode base plates.
Claim 3
Dependent Claim
31 words
An electro-optical cell as claimed in claim 1 in which the polyimide resin film is a film made of a material selected from the group consisting of polyimides, polyamide-imides, and polyester-imides.
Claim 4
Dependent Claim
19 words
An electro-optical cell as claimed in claim 1 in which the polyimide resin film is made of a polyimide.
Claim 5
Dependent Claim
35 words
An electro-optical cell as claimed in claim 3 in which the polyimide is prepared by subjecting to dehydration and ring closure a polyamic acid formed by polyaddition of a carboxylic acid dianhydride and a diamine.
Claim 6
Dependent Claim
37 words
An electro-optical cell as claimed in claim 3 in which the polyimide is prepared by subjecting to dehydration and ring closure a polyamic acid formed by polyaddition of an aromatic carboxylic acid dianhydride and an aromatic diamine.
Claim 7
Dependent Claim
32 words
An electro-optical cell as claimed in claim 3 in which the polyimide is prepared by subjecting to dehydration and ring closure a polyamic acid formed by polyaddition of pyromellitic anhydride and 4,4'-diaminodiphenylether.
Claim 8
Dependent Claim
23 words
An electro-optical cell as claimed in claim 1 in which the thickness of the polyimide resin film is from 0.1 to 5 microns.
Claim 9
Dependent Claim
34 words
An electro-optical cell as claimed in claim 1 in which a film of a polyorganosilane is interposed between the surface having the electrode film of each transparent base plate and the adjacent polyimide film.
Claim 10
Dependent Claim
69 words
An electro-optical cell as claimed in claim 8 in which the polyorganosilane is represented by the general formula RnSiX 4-n , where n is an integer from 1 through 3; X is a member selected from the group consisting of hydrolyzable functional groups, particularly a halogen group, alkoxy, and acyloxy; and R is a member selected from the group consisting of substituted and unsubstituted aliphatic and aromatic hydrocarbon groups.
Claim 11
Dependent Claim
25 words
An electro-optical cell as claimed in claim 1 in which the nematic liquid crystal material contains at least one kind of biphenyl liquid crystal compound.
Claim 12
Dependent Claim
34 words
An electro-optical cell as claimed in claim 10 in which the biphenyl liquid crystal compound is a biphenyl compound expressed by the general formula ##SPC17## (-A: -C m H 2m +1 , ##SPC18## ##SPC19##
Claim 13
Dependent Claim
23 words
An electro-optical cell as claimed in claim 1 in which the nematic liquid crystal material comprises at least one kind of biphenyl liquid
Claim 14
Dependent Claim
39 words
An electro-optical cell as claimed in claim 12 in which the biphenyl liquid crystal compound is a biphenyl compound expressed by the general formula ##SPC20## (-A: -C m H 2m +1 , -OC m H 2m +1 , ##SPC21##
Claim 15
Dependent Claim
25 words
An electro-optical cell as claimed in claim 1 in which the nematic liquid crystal material contains from 0.01 to 5.0 percent by weight of an
Claim 16
Dependent Claim
47 words
An electro-optical cell as claimed in claim 14 in which the optically active compound is a member selected from the group consisting of cholesteryl compounds, and compounds having an optically active substituent selected from the group consisting of biphenyl derivatives phenylbenzoate derivatives, benzylideneaniline derivatives and azoxybenzene derivatives.
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) | 1979-11-30 | 1980-05-31 | 1980-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-30 | 1984-05-31 | 1984-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-30 | 1988-05-31 | 1988-11-30 | $7700.00 | Window Closed / Lapsed |