Patent US4613209A successfully refreshed from Google Patents.
US4613209A
Expired / Lapsed
US
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Smectic liquid crystals
Assignee: Nokia Bell Labs
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Filing: 1982-03-23
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Granted: 1986-09-23
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Expires: 2002-03-23
Abstract
Abstract The use of a certain class of liquid crystal materials that exhibit a smectic C phase allows the production of a bistable liquid crystal display element. Such bistable display elements promote the use of matrix addressing for liquid crystal based elements in a display.
Inventors
- 👤 John W. Goodby
- 👤 Thomas M. Leslie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:12
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/32; C09K19/322; C09K19/02; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/2021; C09K19/24; C09K19/28; C09K2019/325
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
143 words
A display comprising (1) a liquid crystal material, (2) a plurality of electrodes suitable for applying a voltage to said liquid crystal material, (3) electronic means for applying a voltage to a desired electrode, and (4) means for producing an observable optical change upon application of an appropriate voltage, wherein said liquid crystal comprises a liquid crystal in the smectic C phase characterized in that said liquid crystal material comprises a compound represented by the formula ##STR79## where Q is a core entity that comprises a moiety chosen from the group consisting of ##STR80## then Z is H, or CH 3 , where A provides a separation between Q and C a which is at least 2.0 Å, and where C a is an appropriate asymmetric carbon atom whose asymmetry is produced by an appropriate choice of R 1 and R 2 .
Claim 2
Dependent Claim
143 words
A display comprising (1) a liquid crystal material, (2) a plurality of electrodes suitable for applying a voltage to said liquid crystal material, (3) electronic means for applying a voltage to a desired electrode, and (4) means for producing an observable optical change upon application of an appropriate voltage, wherein said liquid crystal comprises a liquid crystal in the smectic C phase characterized in that said liquid crystal material comprises a compound represented by the formula ##STR79## where Q is a core entity that comprises a moiety chosen from the group consisting of ##STR80## then Z is H, or CH 3 , where A provides a separation between Q and C a which is at least 2.0 Å, and where C a is an appropriate asymmetric carbon atom whose asymmetry is produced by an appropriate choice of R 1 and R 2 .
Claim 3
Dependent Claim
15 words
The display of claim 1 wherein Q is the entity represented by the formula ##STR81##
Claim 4
Dependent Claim
17 words
The display of claim 1 or 2 wherein R 1 and R 2 are lower alkyl moieties.
Claim 5
Dependent Claim
11 words
The display of claim 1 wherein said electrode comprises indium oxide.
Claim 6
Dependent Claim
25 words
The display of claim 1 or 2 wherein n is in the range 7 to 16 and m is in the range 2 to 10.
Claim 7
Dependent Claim
11 words
The display of claim 1 wherein A is a methylene group.
Claim 8
Dependent Claim
18 words
The display of claim 1 wherein said liquid crystal material comprises a compound represented by the formula ##STR82##
Claim 9
Dependent Claim
17 words
The display of claim 1 wherein said means for producing an observable optical change comprises crossed polarizers.
Claim 10
Dependent Claim
95 words
A display comprising a liquid crystal material in the smectic C phase contacting an electrode characterized in that said liquid crystal material comprises a compound represented by the formula ##STR83## where Q is a core entity that comprises a moiety chosen from the group consisting of ##STR84## then Z is H, or CH 3 , where A provides a separation between Q and C a which is at least 2.0 Å, and where C a is an asymmetric carbon atom whose asymmetry is produced by an appropriate choice of R 1 and R 2 .
Claim 11
Dependent Claim
95 words
A display comprising a liquid crystal material in the smectic C phase contacting an electrode characterized in that said liquid crystal material comprises a compound represented by the formula ##STR83## where Q is a core entity that comprises a moiety chosen from the group consisting of ##STR84## then Z is H, or CH 3 , where A provides a separation between Q and C a which is at least 2.0 Å, and where C a is an asymmetric carbon atom whose asymmetry is produced by an appropriate choice of R 1 and R 2 .
Claim 12
Dependent Claim
15 words
The display of claim 9 wherein Q is the entity represented by the formula ##STR85##
Claim 13
Dependent Claim
17 words
The display of claim 9 or 10 wherein R 1 and R 2 are lower alkyl moieties.
Claim 14
Dependent Claim
25 words
The display of claim 9 or 10 wherein n is in the range 7 to 16 and m is in the range 2 to 10.
Claim 15
Dependent Claim
11 words
The display of claim 9 wherein A is a methylene group.
Claim 16
Dependent Claim
18 words
The display of claim 9 wherein said liquid crystal material comprises a compound represented by the formula ##STR86##
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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) | 1989-09-22 | 1990-03-24 | 1990-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-22 | 1994-03-24 | 1994-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-22 | 1998-03-24 | 1998-09-23 | $7700.00 | Window Closed / Lapsed |