US4460248A
Expired / Lapsed
US
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Two-layer guest-host liquid crystal display device
Assignee: Sharp Corp
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Filing: 1981-11-25
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Granted: 1984-07-17
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Expires: 2001-11-25
Abstract
Abstract A two-layer guest-host liquid crystal display device is provided, each layer having a guest-host liquid crystal layer sandwiched between a pair of substrates and being provided with an electrode for applying an electric field to said liquid crystal layer, which comprises a first display layer comprising a P-type pleochroic dye material and a first liquid crystal material and a second display layer comprising an N-type pleochroic dye material and a second liquid crystal material.
Inventors
- 👤 Yoshihiro Shirai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:19
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1347; G02F1/13475
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
99 words
A two-layer guest-host liquid crystal display device, each guest-host liquid crystal layer being sandwiched between a pair of substrates provided with electrodes for applying an electric field to said respective liquid crystal layers, comprising: a first display layer comprising a P-type pleochroic dye material and a first liquid crystal material; and a second display layer comprising an N-type pleochroic dye material and a second liquid crystal material such that upon controlled orientation of said dye materials with respect to the substrates a single color or dual color display can be provided on a background of a single solid color.
Claim 2
Dependent Claim
99 words
A two-layer guest-host liquid crystal display device, each guest-host liquid crystal layer being sandwiched between a pair of substrates provided with electrodes for applying an electric field to said respective liquid crystal layers, comprising: a first display layer comprising a P-type pleochroic dye material and a first liquid crystal material; and a second display layer comprising an N-type pleochroic dye material and a second liquid crystal material such that upon controlled orientation of said dye materials with respect to the substrates a single color or dual color display can be provided on a background of a single solid color.
Claim 3
Dependent Claim
61 words
The device of claim 1, wherein either of the first liquid crystal material and the second liquid crystal material is selected from the group consisting of a nematic liquid crystal, a nematic liquid crystal and a cholesteric liquid crystal of a slight amount, a nematic liquid crystal and a cholesteric liquid crystal of a small amount, and a cholesteric liquid crystal.
Claim 4
Dependent Claim
44 words
The device of claim 1, wherein either of the first liquid crystal material and the second liquid crystal material is selected from the group consisting of a nematic liquid crystal, a nematic liquid crystal and a cholesteric liquid crystal and a cholesteric liquid crystal.
References Cited (Backward Citations)
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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) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |