US5384168A
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US
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Ferroelectric liquid-crystal display of high contrast and brightness
Assignee: Hoechst AG
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Filing: 1991-04-19
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Granted: 1995-01-24
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Expires: 2011-04-19
Abstract
Abstract Ferroelectric liquid-crystal display of high contrast and brightness. The use of alignment layers containing compounds having an amphiphilicity-providing effect increases the contrast and brightness of the image in FLC displays.
Inventors
- 👤 Hans-Rolf Dubal
- 👤 Takamasa Harada
- 👤 Heinz Rieger
- 👤 Norbert Rosch
- 👤 Peter Wegener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:51
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; G02F1/133719; C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/34; C09K19/3441; C09K19/345; C09K19/3458; C09K19/3463; C09K2323/00; C09K2323/02; C09K2323/025; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/31; Y10T428/31504; Y10T428/31721; Y10T428/31725; Y10T428/31786
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
92 words
A ferroelectric liquid-crystal display device of high contrast and brightness comprising a ferroelectric liquid-crystal layer which is surrounded on both sides by layers which are, in sequence starting from the ferroelectric liquid-crystal layer, at least one alignment layer, electrodes and outer plates and also at least one polarizer, wherein the alignment layer comprises within the layer, as a mixture component of the material of the alignment layer, or at the surface, as an additional layer between the alignment layer and the ferroelectric liquid-crystal layer, a component which renders the alignment layer amphiphilic.
Claim 2
Dependent Claim
92 words
A ferroelectric liquid-crystal display device of high contrast and brightness comprising a ferroelectric liquid-crystal layer which is surrounded on both sides by layers which are, in sequence starting from the ferroelectric liquid-crystal layer, at least one alignment layer, electrodes and outer plates and also at least one polarizer, wherein the alignment layer comprises within the layer, as a mixture component of the material of the alignment layer, or at the surface, as an additional layer between the alignment layer and the ferroelectric liquid-crystal layer, a component which renders the alignment layer amphiphilic.
Claim 3
Dependent Claim
30 words
A liquid-crystal display as claimed in claim 1, wherein the component which renders the alignment layer amphiphilic is an additional layer between the alignment layer and the ferroelectric liquid-crystal layer.
Claim 4
Dependent Claim
31 words
A liquid-crystal display as claimed in claim 1, wherein the component which renders the alignment layer amphiphilic has been added to the material of the alignment layer as a mixture component.
Claim 5
Dependent Claim
30 words
A liquid-crystal display as claimed in claim 2, wherein the component which renders the alignment layer amphiphilic is linked to the material of the alignment layer by a chemical reaction.
Claim 6
Dependent Claim
28 words
(Amended) A liquid-crystal display as claimed in claim 1, wherein the alignment layer comprises a compound selected from the group consisting of a polyimide, polyamide and polyvinyl alcohol.
Claim 7
Dependent Claim
55 words
(Amended) A liquid-crystal display as claimed in claim 1, wherein the alignment layer contains a compound selected from the group consisting of a polyamide, polyimide and polyvinyl alcohol and at least one compound selected from the group consisting of a macrocyclic compound, a cryptand, a coronand, a podand, a mercapto compound and an ionophoric compound.
Claim 8
Dependent Claim
44 words
A liquid-crystal display as claimed in claim 6, wherein the alignment layer contains from 0.01 to 50% by weight of a compound selected from the group consisting of a macrocyclic compound, a cryptand, a coronand, a podand, a mercapto compound and an ionophoric compound.
Claim 9
Dependent Claim
25 words
A liquid-crystal display as claimed in claim 1, which additionally contains an insulation layer of high dielectric constant between the electrodes and the alignment layer.
Claim 10
Dependent Claim
20 words
A liquid-crystal display as claimed in claim 1, wherein the FLC medium also contains a compound having an amphiphilicity-providing effect.
Claim 11
Dependent Claim
44 words
A liquid-crystal display as claimed in claim 7, wherein the alignment layer contains from 0.1 to 25% by weight of a compound selected from the group consisting of a macrocyclic compound, a cryptand, a coronand, a podand, a mercapto compound and an ionophoric compound.
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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) | 1998-01-23 | 1998-07-25 | 1999-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-23 | 2002-07-25 | 2003-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-23 | 2006-07-25 | 2007-01-24 | $7700.00 | Window Closed / Lapsed |