US4585310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alignment layer orientation in raster scan thermally addressed smectic liquid crystal displays
Assignee: International Business Machines Corp
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Filing: 1983-12-12
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Granted: 1986-04-29
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Expires: 2003-12-12
Abstract
Abstract The orientation of the alignment layer in a raster-scanned thermally addressed smectic liquid crystal display device can be chosen relative to the writing orientation to accentuate a selected characteristic. A perpendicular alignment with respect to the scan direction produces uniformly written images in both scan directions to allow high quality bidirectional writing. In a preferred embodiment the liquid crystal cell includes a liquid crystal material comprising 4-octyloxy-4'-cyanobiphenyl 37.5%, 4-decyl-4'-cyanobiphenyl 36.8% weight percent and 4-undecyl-4'-cyanobiphenyl 25.7 weight percent.
Inventors
- 👤 Nicholas J. Clecak
- 👤 Robert J. Cox
- 👤 Joseph S. Feng
- 👤 Jerry Leff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:49
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/132; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133502; G02F1/1337
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
107 words
A reflective liqud crystal cell addressed by a scanning laser and having a first and second substrate being separated by a spacing member to form a cavity, said cell comprising an inplane alignment layer on said first substrate, said alignment layer being oriented in a direction taken from the group consisting of perpendicular, parallel and antiparallel to the scanning direction of the laser wherein the orientation direction of the alignment layer determines the characteristics of the written image, and wherein said cell includes a liquid crystal material in said cavity, said material comprising 4-octyloxy-4'-cyanobiphenyl, 37.5%±0.5 weight percent, 4 decyl-4'-cyanobiphenyl 36.8±0.5 weight percent and 4-undecyl-4'-cyanobiphenyl 25.7±0.5 weight percent.
Claim 2
Dependent Claim
107 words
A reflective liqud crystal cell addressed by a scanning laser and having a first and second substrate being separated by a spacing member to form a cavity, said cell comprising an inplane alignment layer on said first substrate, said alignment layer being oriented in a direction taken from the group consisting of perpendicular, parallel and antiparallel to the scanning direction of the laser wherein the orientation direction of the alignment layer determines the characteristics of the written image, and wherein said cell includes a liquid crystal material in said cavity, said material comprising 4-octyloxy-4'-cyanobiphenyl, 37.5%±0.5 weight percent, 4 decyl-4'-cyanobiphenyl 36.8±0.5 weight percent and 4-undecyl-4'-cyanobiphenyl 25.7±0.5 weight percent.
Claim 3
Dependent Claim
32 words
A cell as described in claim 1 wherein said alignment layer is oriented perpendicular to the scanning direction of the laser to produce a uniform written image in a bidirectionally scanned area.
Claim 4
Dependent Claim
30 words
A cell as described in claim 1 wherein said alignment layer is oriented parallel to the scanning direction of the laser to maximize the contrast in a unidirectionally scanned area.
Claim 5
Dependent Claim
37 words
A cell as described in claim 1 wherein said alignment layer is oriented antiparallel to the scanning direction of the laser to increase the selective erase window and to improve the resolution in the unidirectionally written image.
References Cited (Backward Citations)
US3655269A
Cited
US3834729A
Cited
US3974087A
Cited
US4099857A
Cited
US4291948A
Cited
US4261650A
Cited
US4277147A
Cited
JPS5624318A
Cited
US4422732A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-28 | 1989-10-28 | 1990-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-28 | 1993-10-28 | 1994-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-28 | 1997-10-28 | 1998-04-29 | $7700.00 | Window Closed / Lapsed |