Patent US5186985A successfully refreshed from Google Patents.
US5186985A
Expired / Lapsed
US
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Liquid crystal displays of high tilt bias angles
Assignee: Kent State University
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Filing: 1991-04-04
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Granted: 1993-02-16
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Expires: 2011-04-04
Abstract
Abstract Liquid Crystal Display Devices having alignment layers of polyimides which are characterized by pendant perfluorinated chains, preferably linear, and having more than 6 perfluorinated carbon atoms. These alignment layers are capable to provide the Liquid Crystal Display Devices with stable tilt angles of 5 or more degrees.
Inventors
- 👤 William E. Estes
- 👤 David P. Higley
- 👤 Brian C. Auman
- 👤 Andrew E. Feiring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:01
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1039; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; G02F1/133723; C09; C09K; C09K2323/00; C09K2323/02; C09K2323/027; C09K2323/0271
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
92 words
In an improved liquid crystal display device of the type having a common liquid crystal layer with opposite sides, a set of electrodes on either side of the liquid crystal layer, and an alignment polyimide layer between each set of electrodes and the common liquid crystal layer, wherein the improvement comprises the polyimide layer contains pendant perfluorinated hydrocarbon chains of more than 6 perfluorinated carbon atoms, wherein the polyimide layer comprises a reaction product of an acid dianhydride and a diamine, and wherein the pendant perfluorinated chains are part of the diamine.
Claim 2
Dependent Claim
92 words
In an improved liquid crystal display device of the type having a common liquid crystal layer with opposite sides, a set of electrodes on either side of the liquid crystal layer, and an alignment polyimide layer between each set of electrodes and the common liquid crystal layer, wherein the improvement comprises the polyimide layer contains pendant perfluorinated hydrocarbon chains of more than 6 perfluorinated carbon atoms, wherein the polyimide layer comprises a reaction product of an acid dianhydride and a diamine, and wherein the pendant perfluorinated chains are part of the diamine.
Claim 3
Dependent Claim
33 words
The liquid crystal display device as defined in claim 1, wherein the alignment polyimide layer is adaptable to provide the liquid crystal layer with a constant tilt angle of 5 degrees or more.
Claim 4
Dependent Claim
40 words
The liquid crystal display device as defined in claim 1, wherein the pendant perfluorinated chains are contained in the polyimide in an effective amount to provide the liquid crystal layer with a constant tilt angle of 5 degrees or more.
Claim 5
Dependent Claim
17 words
The liquid crystal display device as defined in claim 1, wherein the dianhydride is 3,3',4,4'-benzophenonetetracarboxylic acid dianhydride.
Claim 6
Dependent Claim
17 words
The liquid crystal display device as defined in claim 1, wherein the pendant perfluorinated chain is linear.
Claim 7
Dependent Claim
22 words
The liquid crystal display device as defined in claim 5, wherein the pendant perfluorinated chain comprises 8 or more perfluorinated carbon atoms.
Claim 8
Dependent Claim
15 words
The liquid crystal display device as defined in claim 6, wherein the diamine is 3,5-diamino-1-perfluorooctylbenzene.
Claim 9
Dependent Claim
17 words
The liquid crystal display device as defined in claim 7, wherein the dianhydride is 3,3',4,4'-benzophenonetetracarboxylic acid dianhydride.
Claim 10
Dependent Claim
15 words
The liquid crystal display device as defined in claim 6, wherein the diamine is 2-perfluorooctyl-4,6-diaminomesitylene.
Claim 11
Dependent Claim
17 words
The liquid crystal display device as defined in claim 9, wherein the dianhydride is 3,3',4,4'-benzophenonetetracarboxylic acid dianhydride.
Claim 12
Dependent Claim
15 words
The liquid crystal display device as defined in claim 6, wherein the diamine is 4-(1,1,11-trihydroperfluorounecyloxy)-1,3-phenylenediamine.
Claim 13
Dependent Claim
17 words
The liquid crystal display device as defined in claim 11, wherein the dianhydride is 3,3',4,4'-benzophenonetetracarboxylic acid dianhydride.
References Cited (Backward Citations)
JPS63153133A
Cited
US4735492A
Cited
JPS62149006A
Cited
JPS62270009A
Cited
US4749777A
Cited
JPS634760A
Cited
JPS634366A
Cited
JPS634365A
Cited
JPS63153134A
Cited
US4864008A
Cited
JPH0228236A
Cited
JPH06294180A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-02-16 | 1996-08-17 | 1997-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-02-16 | 2000-08-17 | 2001-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-02-16 | 2004-08-17 | 2005-02-16 | $7700.00 | Window Closed / Lapsed |