US4469408A
Expired / Lapsed
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Liquid-crystal display having orienting polymer with flexible bridges
Assignee: Siemens AG
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Filing: 1981-05-20
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Granted: 1984-09-04
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Expires: 2001-05-20
Abstract
Abstract Liquid crystal display with a liquid crystal layer which can be switched between two optically different states. Two support plates have the surfaces facing each other coated with an electrically conducting layer as well as an orientation layer with at least one orientation layer consisting of a polymer. The plates enclose the liquid-crystal layer. The polymer is liquid-crystalline and can be switched to the off-state and on-state--in the process of which it generates the rest state of the liquid-crystal layer in the off-condition and, in the on-condition, at least enhances the excited state of the liquid-crystal layer.
Inventors
- 👤 Hans Kruger
- 👤 Roland Rubner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:47
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; C; C09; C09K; C09K2323/00; C09K2323/02; C09K2323/027
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
153 words
Liquid crystal display with I. a liquid-crystal layer switchable between two optically different states of a rest state in which the liquid-crystal layer is in a first orientation state and an excited state in which the liquid-crystal layer is in a second optically different orientation state, and II. two support plates which (a) enclose the liquid-crystal layer between them, and (b) carry on their surfaces facing each other respective electrically conducting coatings as electrodes as well as (c) an orientation layer which faces the liquid-crystal layer, where (d) at least one of the two orientation layers consists of polymer, the combination therewith that (e) the polymer layer is liquid-crystalline and (f) is switchable between two different states of off-state and on-state, (g) in the process of which it generates the rest state of the liquid-crystal layer in the off-condition and, in the on-condition, at least enhances the excited state of the liquid-crystal layer.
Claim 2
Dependent Claim
153 words
Liquid crystal display with I. a liquid-crystal layer switchable between two optically different states of a rest state in which the liquid-crystal layer is in a first orientation state and an excited state in which the liquid-crystal layer is in a second optically different orientation state, and II. two support plates which (a) enclose the liquid-crystal layer between them, and (b) carry on their surfaces facing each other respective electrically conducting coatings as electrodes as well as (c) an orientation layer which faces the liquid-crystal layer, where (d) at least one of the two orientation layers consists of polymer, the combination therewith that (e) the polymer layer is liquid-crystalline and (f) is switchable between two different states of off-state and on-state, (g) in the process of which it generates the rest state of the liquid-crystal layer in the off-condition and, in the on-condition, at least enhances the excited state of the liquid-crystal layer.
Claim 3
Dependent Claim
24 words
Liquid-crystal display according to claim 1, wherein first, the liquid-crystal layer and then the polymer layer is reoriented when the switching voltage is applied.
Claim 4
Dependent Claim
30 words
Liquid-crystal display according to claim 1, wherein in electrically switching the liquid-crystal layer, first, the liquid-crystal layer and then the polymer layer is reoriented when the switching voltage is removed.
Claim 5
Dependent Claim
26 words
Liquid-crystal display according to claim 1, wherein first, the liquid-crystal layer and then the polymer layer is reoriented when the switching voltage is applied and removed.
Claim 6
Dependent Claim
55 words
Liquid-crystal display according to claim 2 or claim 3 or claim 4 wherein the polymer layer orients the liquid-crystal layer uniformly parallel to the plates in the off-state and uniformly perpendicular to the plates in the on-state, and wherein in the rest condition the liquid-crystal layer is twisted 90° along the normal to the plates.
Claim 7
Dependent Claim
54 words
Liquid-crystal display according to claim 2 or claim 3 or claim 4, wherein the polymer layer orients the liquid-crystal layer perpendicularly to the plates in the off-state and uniformly parallel to the plates in the on-state and wherein in the excited state the liquid-crystal layer is twisted 90° along the normal to the plate.
Claim 8
Dependent Claim
55 words
Liquid-crystal display according to claim 2 or claim 3 or claim 4 wherein the polymer layer orients the liquid-crystal layer uniformly parallel to the plates in the off-state and perpendicular to the plates in the on-state, and wherein the liquid-crystal layer is oriented cholesterically in the rest condition and homeotropically nematically in the excited state.
Claim 9
Dependent Claim
30 words
Liquid-crystal display according to claim 1, wherein in electrically switching the liquid-crystal layer, first, the polymer layer is reoriented and, subsequently, the liquid-crystal layer when the switching voltage is applied.
Claim 10
Dependent Claim
30 words
Liquid-crystal display according to claim 1, wherein in electrically switching the liquid-crystal layer, first, the polymer layer is reoriented and, subsequently, the liquid-crystal layer when the switching voltage is removed.
Claim 11
Dependent Claim
32 words
Liquid-crystal display according to claim 1, wherein in electrically switching the liquid-crystal layer, first, the polymer layer is reoriented and, subsequently, the liquid-crystal layer when the switching voltage is applied and removed.
Claim 12
Dependent Claim
53 words
Liquid-crystal display according to claim 8 or claim 9 or claim 10, wherein the polymer layer is oriented uniformly parallel to the plates in the off-state and perpendicular to the plates in the on-state, and wherein the liquid-crystal layer is oriented cholesterically in the rest condition and homeotropically nematically in the excited state.
Claim 13
Dependent Claim
23 words
Liquid-crystal display according to claim 1, wherein the liquid-crystal layer is switched into its two switching states exclusively by the switching polymer layer.
Claim 14
Dependent Claim
22 words
Liquid-crystal display according to claim 1, wherein the polymer layer polarizes passing light in at least one of its two switching states.
Claim 15
Dependent Claim
80 words
Liquid-crystal display according to claim 13, wherein one of the two orientation layers is a polymer layer which polarizes passing light along the liquid-crystal director and orients the liquid-crystal layer perpendicular to the plates in the off-state, and lets transmitted light pass unattenuated and orients the liquid-crystal layer parallel to the plates in the on-state; and that the liquid-crystal layer facing away from the polymer layer has a further polarizer which polarizes in its off-state parallel to the polymer layer.
Claim 16
Dependent Claim
55 words
Liquid-crystal display according to claim 1, wherein the polymer layer contains main chains, to which mesogenic side chains are coupled via flexible bridges by pairs of chemical functions capable of addition selected from the group consisting of ##STR5## wherein R is selected from the group consisting of hydrogen and alkyl, and R 1 is alkyl.
Claim 17
Dependent Claim
58 words
Liquid-crystal display according to claim 1, wherein the polymer layer contains main chains which are coupled to mesogenic units via flexible bridges, by pairs of chemical functions capable of condensation selected from the group consisting of ##STR6## wherein R is selected from the group consisting of hydrogen and alkyl, and R 1 and R 2 each is alkyl.
Claim 18
Dependent Claim
38 words
Liquid-crystal display according to claim 1, characterized by the feature that the polymer layer consists of components of the type (-flexible bridge/mesogenic unit), where the bridges are polymerized with each other via chemical functions from the group: ##STR7##
Claim 19
Dependent Claim
23 words
Liquid-crystal display according to claim 15, wherein the flexible bridges are members selected from the group consisting of alkylene and alkylene ether chains.
Claim 20
Dependent Claim
23 words
Liquid-crystal display according to claim 16, wherein the flexible bridges are members selected from the group consisting of alkylene and alkylene ether chains.
Claim 21
Dependent Claim
23 words
Liquid-crystal display according to claim 17, wherein the flexible bridges are members selected from the group consisting of alkylene and alkylene ether chains.
Claim 22
Dependent Claim
44 words
Liquid-crystal display according to claim 1 or claim 15 or claim 16 or claim 17, wherein the thicknesses of the polymer layer and other support plate layers are matched to each other in such a manner that the liquid-crystal display is optically coated internally.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |