US5231528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferroelectric liquid crystal components having high spontaneous polarization and low helical pitch
Assignee: Hoechst AG
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Filing: 1992-11-20
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Granted: 1993-07-27
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Expires: 2012-11-20
Abstract
Abstract What is described is a surface stabilized ferroelectric liquid crystal display with a layer thickness of 1 to 10 μm containing a ferroelectric liquid crystal mixture having a high spontaneous polarization of P s greater than 20 nC·cm 31 2 and a natural helical pitch of less than one half of the layer thickness.
Inventors
- 👤 Claus Escher
- 👤 Wolfgang Hemmerling
- 👤 Gerhard Illian
- 👤 Takamasa Harada
- 👤 Mikio Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:38
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/58; C09K19/586; C09K19/588; C09K19/02; C09K19/0225; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/139; G02F1/141
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
58 words
A surface stabilized ferroelectric liquid crystal display with a layer thickness of 1 to 10 μm, which comprises a ferroelectric liquid crystal mixture containing at least 65.6% by weight of achiral components and having a high spontaneous polarization of P s >20 nC·cm -2 and a natural helical pitch of less than one half of the layer thickness.
Claim 2
Dependent Claim
58 words
A surface stabilized ferroelectric liquid crystal display with a layer thickness of 1 to 10 μm, which comprises a ferroelectric liquid crystal mixture containing at least 65.6% by weight of achiral components and having a high spontaneous polarization of P s >20 nC·cm -2 and a natural helical pitch of less than one half of the layer thickness.
Claim 3
Dependent Claim
16 words
The display as claimed in claim 1, wherein the layer thickness is 1.2 to 3 μm.
Claim 4
Dependent Claim
19 words
The display as claimed in claim 2, wherein the helical pitch is greater than 1/10 of the layer thickness.
Claim 5
Dependent Claim
24 words
The display as claimed in claim 2, wherein the ferroelectric liquid crystal mixture exhibits a spontaneous polarization of P s ≦35 nC·cm 31 2.
Claim 6
Dependent Claim
24 words
The display as claimed in claim 2, wherein the ferroelectric liquid crystal mixture exhibits a spontaneous polarization of P s >40 nC·cm -2 .
Claim 7
Dependent Claim
19 words
The display as claimed in claim 1, wherein the helical pitch is greater than 1/10 of the layer thickness.
Claim 8
Dependent Claim
24 words
The display as claimed in claim 6, wherein the ferroelectric liquid crystal mixture exhibits a spontaneous polarization of P s >35 nC·cm -2 .
Claim 9
Dependent Claim
24 words
The display as claimed in claim 6, wherein the ferroelectric liquid crystal mixture exhibits a spontaneous polarization of P s >40 nC·cm -2 .
Claim 10
Dependent Claim
24 words
The display as claimed in claim 1, wherein the ferroelectric liquid crystal mixture exhibits a spontaneous polarization of P s >35 nC·cm -2 .
Claim 11
Dependent Claim
24 words
The display as claimed in claim 1, wherein the ferroelectric liquid crystal mixture exhibits a spontaneous polarization of P s >40 nC·cm -2 .
Claim 12
Dependent Claim
70 words
A ferroelectric liquid crystal display for surface stabilized ferroelectric liquid crystal technology, said display having a layer thickness of 1 to 10 μm, containing a ferroelectric liquid crystal mixture containing at least 65.6% by weight of achiral components and having a high spontaneous polarization of P s >20 nC·cm -2 and a natural helical pitch of less than one half of the layer thickness of the ferroelectric liquid crystal display.
Claim 13
Dependent Claim
70 words
A ferroelectric liquid crystal display for surface stabilized ferroelectric liquid crystal technology, said display having a layer thickness of 1 to 10 μm, containing a ferroelectric liquid crystal mixture containing at least 65.6% by weight of achiral components and having a high spontaneous polarization of P s >20 nC·cm -2 and a natural helical pitch of less than one half of the layer thickness of the ferroelectric liquid crystal display.
Claim 14
Dependent Claim
28 words
The ferroelectric liquid crystal display as claimed in claim 11, wherein molecular orientation of the ferroelectric liquid crystal mixture is switched by pulsed application of an electric field.
References Cited (Backward Citations)
US4367924A
Cited
EP0032362A1
Cited
US4834500A
Cited
US4943387A
Cited
US4931208A
Cited
GB2174820A
Cited
US4778259A
Cited
US4824217A
Cited
US4969719A
Cited
US4852978A
Cited
US4832461A
Cited
US4876028A
Cited
US4913838A
Cited
EP0283916A2
Cited
EP0309774A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-26 | 1997-01-25 | 1997-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-26 | 2001-01-25 | 2001-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-26 | 2005-01-25 | 2005-07-27 | $7700.00 | Window Closed / Lapsed |