Patent US4026637A successfully refreshed from Google Patents.
US4026637A
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US
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Timepiece display device utilizing liquid crystals of positive dielectric anisotropy
Assignee: Suwa Seikosha KK
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Filing: 1976-02-13
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Granted: 1977-05-31
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Expires: 1996-02-13
Abstract
Abstract A timepiece display device utilizes liquid crystals of positive dielectric anisotropy in a transparent cell having transparent electrodes on the interior surfaces of the cell walls. The device includes a polarizing filter and an analyzing filter at opposite faces of the cell and a mirror for reflecting light back through the cell in an arrangement which increases the intensity and contrast of the display.
Inventors
- 👤 Yoshio Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:20
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133553; G04; G04G; G04G9/00; G04G9/0023; G04G9/0029; G04G9/0035
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
109 words
A timepiece display device, comprising opposed unidirectionally oriented transparent plates, said plates being so positioned that said orientation directions are perpendicular to each other, at least one transparent conductive electrode on the inner surface of each of said plates, said electrodes being connectable to an external voltage source, nematic liquid crystal material of positive dielectric anisotropy between said plates, a polarizing filter at the exterior face of one of said transparent plates, an analyzing filter at the exterior surface of the other of said transparent plates, said analyzing filter having a rough exterior surface, a reflector exterior to said analyzing filter and contiguous with the rough exterior surface thereof.
Claim 2
Dependent Claim
109 words
A timepiece display device, comprising opposed unidirectionally oriented transparent plates, said plates being so positioned that said orientation directions are perpendicular to each other, at least one transparent conductive electrode on the inner surface of each of said plates, said electrodes being connectable to an external voltage source, nematic liquid crystal material of positive dielectric anisotropy between said plates, a polarizing filter at the exterior face of one of said transparent plates, an analyzing filter at the exterior surface of the other of said transparent plates, said analyzing filter having a rough exterior surface, a reflector exterior to said analyzing filter and contiguous with the rough exterior surface thereof.
Claim 3
Dependent Claim
18 words
The timepiece display device as defined in claim 1, wherein said reflector is a metal of high reflectivity.
Claim 4
Dependent Claim
23 words
The timepiece display device as defined in claim 2, wherein said metal is selected from the group consisting of silver, aluminum and nickel.
Claim 5
Dependent Claim
18 words
The timepiece display device as defined in claim 1, wherein said reflector is a powder of high reflectivity.
Claim 6
Dependent Claim
16 words
The timepiece display device as defined in claim 4, wherein said reflector is of magnesium carbonate.
Claim 7
Dependent Claim
24 words
The timepiece display device as defined in claim 1, wherein said polarization axes of said polarizing and analyzing filters are parallel to each other.
Claim 8
Dependent Claim
24 words
The timepiece display device as defined in claim 1, wherein said polarization axes of said polarizing and analyzing filters are perpendicular to each other.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |