US3784280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-dark reflective liquid crystal display
Assignee: LXD Inc
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Filing: 1973-01-02
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Granted: 1974-01-08
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Expires: 1993-01-02
Abstract
Abstract Described are light-dark contrasting displays comprising a liquid crystal cell including a nematic liquid crystal composition with a positive dielectric anisotropy having mutually parallel molecular alignment at opposing planar surfaces of the cell, an optical polarizer positioned on one side of the cell and an optically reflecting member on the other side of the cell. Light-dark images are produced by controllably altering the molecular alignment of the liquid crystal composition in selected regions.
Inventors
- 👤 J Bigelow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:10
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/139; G02F1/1393; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133738; G02F1/13706; G02F2203/00; G02F2203/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
24 words
The display of claim 1 wherein said optical reflecting member comprises a reflective surface coating applied to one surface of said liquid crystal cell.
Claim 2
Dependent Claim
34 words
The display of claim 1 wherein said means for altering the molecular alignment of said liquid crystal composition comprises a source of electric potential for applying an electric field to said liquid crystal composition.
Claim 3
Dependent Claim
35 words
The display of claim 1 wherein said liquid crystal cell retards one component of light impinging thereon with respect to the orthogonal component of light by 90* thereby producing circularly polarized light at its output.
Claim 4
Dependent Claim
39 words
The display of claim 1 wherein said optical polarizer has an orientation which polarizes light impinging thereon at a 45* angle with respect to the molecular alignment of said liquid crystal composition in the absence of an electric field.
References Cited (Backward Citations)
US3731986A
Cited
US3694053A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |