US4016094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-optical device
Assignee: Panasonic Holdings Corp
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Filing: 1975-03-17
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Granted: 1977-04-05
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Expires: 1995-03-17
Abstract
Abstract An electro-optical device using a liquid crystal consisting of 99.9 to 30 wt.% of at least one nematic liquid crystal and 0.1 to 70 wt. % of at least one optically active liquid crystal compound, (+)-p-alkoxy-p'-(2-methylbutyl)azoxybenzene. Such a device has a better display performance than similar devices because the mixture has a threshold voltage and a rapid response to an electric signal applied to the device, and so it is very practical for a matrix display device.
Inventors
- 👤 Masahide Tsukamoto
- 👤 Tetsuro Ohtsuka
- 👤 Kazuhisa Morimoto
- 👤 Yoshinobu Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:25
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/24; C09K19/26; C09K19/42
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
120 words
In an electro-optical device having a cell for containing a liquid crystal and consisting of two light-transparent plates opposed to each other and having electrically conductive electrodes on the inner surfaces thereof, the electrodes on at least one inner surface being light-transparent and spacer means between said opposed electrodes; and a power supply coupled to said electrodes for applying an electric voltage to said electrodes, the improvement comprising a liquid crystal in said cell between said electrodes consisting of 99.9 to 30 wt. % of at least one nematic liquid crystal and 0.1 to 70 wt. % of at least one optically active liquid crystal compound of the formula; ##SPC2## wherein R is a methoxy, ethoxy, propoxy or butoxy radical.
Claim 2
Dependent Claim
120 words
In an electro-optical device having a cell for containing a liquid crystal and consisting of two light-transparent plates opposed to each other and having electrically conductive electrodes on the inner surfaces thereof, the electrodes on at least one inner surface being light-transparent and spacer means between said opposed electrodes; and a power supply coupled to said electrodes for applying an electric voltage to said electrodes, the improvement comprising a liquid crystal in said cell between said electrodes consisting of 99.9 to 30 wt. % of at least one nematic liquid crystal and 0.1 to 70 wt. % of at least one optically active liquid crystal compound of the formula; ##SPC2## wherein R is a methoxy, ethoxy, propoxy or butoxy radical.
Claim 3
Dependent Claim
18 words
An electro-optical device as claimed in claim 1, wherein said nematic liquid crystal has a positive dielectric anisotropy.
Claim 4
Dependent Claim
18 words
An electro-optical device as claimed in claim 1, wherein said nematic liquid crystal has a negative dielectric anisotropy.
Claim 5
Dependent Claim
18 words
An electro-optical device as claimed in claim 1, wherein said electrodes on one inner surface are light reflective.
Claim 6
Dependent Claim
64 words
An electro-optical device as claimed in claim 1, wherein at least one of said plates has a plurality of light transparent strip-shaped electrodes on the surface thereof, respectively and the direction of the strip electrodes on one of said plates intersects with that of the strip electrodes on the other said plates so as to provide a plurality of display elements at the intersections.
Claim 7
Dependent Claim
20 words
An electro-optical device as claimed in claim 5, wherein said strip-shaped electrodes on one of said plates are light reflective.
Claim 8
Dependent Claim
18 words
An electro-optical device as claimed in claim 5, wherein a plurality of said display elements form 7-segment numerics.
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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) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |