US4723840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display using opaque flaps for reflection
Assignee: Veglia SA France
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Filing: 1986-05-29
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Granted: 1988-02-09
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Expires: 2006-05-29
Abstract
Abstract A liquid crystal display device is provided comprising a liquid crystal wafer operating by transmission which is disposed in front of a sheet of transparent material having a multitude of parallel opaque flaps substantially perpendicular to the wafer. In daytime use, light rays substantially perpendicular to the wafer pass through the sheet towards the rear of the wafer. For nightime use, the sheet reflects rearwardly of the wafer a part of the light rays coming from a lamp and the flaps stop the other part of these light rays.
Inventors
- 👤 Jean Humbert
- 👤 Yvan Archambaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:20
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/133602; G02F1/133605; G09; G09F; G09F9/00; G09F9/30; G09F9/35; G02F1/133615; G02F1/133618; G02F1/133626
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
87 words
In a liquid crystal display device functioning by transparency, comprising a liquid crystal wafer functioning by transmission, said wafer is disposed in front of a sheet of transparent material comprising a plurality of parallel opaque flaps, and means channel the light from a light source in a direction substantially parallel to said wafer towards said sheet disposed for reflecting back to said wafer at least a part of said light, said flaps being oriented substantially perpendicularly to said wafer for stopping the unreflected part of said light.
Claim 2
Dependent Claim
87 words
In a liquid crystal display device functioning by transparency, comprising a liquid crystal wafer functioning by transmission, said wafer is disposed in front of a sheet of transparent material comprising a plurality of parallel opaque flaps, and means channel the light from a light source in a direction substantially parallel to said wafer towards said sheet disposed for reflecting back to said wafer at least a part of said light, said flaps being oriented substantially perpendicularly to said wafer for stopping the unreflected part of said light.
Claim 3
Dependent Claim
33 words
The display device as claimed in claim 1, wherein said means for channelling said light, comprise a cavity, inside which said light source is disposed, comprising opaque walls, reflecting means, and a window.
Claim 4
Dependent Claim
30 words
The display device as claimed in claim 1, wherein scores are formed in the face of the sheet situated on the wafer side for reflecting said light towards said wafer.
Claim 5
Dependent Claim
33 words
The display device as claimed in claim 2, wherein said window comprises opaque strips oriented substantially parallel to said wafer for coming in the path of the direct rays from said light source.
Claim 6
Dependent Claim
30 words
The display device as claimed in claim 2, wherein scores are formed in the face of the sheet situated on the wafer side for reflecting said light towards said wafer.
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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) | 1991-02-08 | 1991-08-10 | 1992-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-08 | 1995-08-10 | 1996-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-08 | 1999-08-10 | 2000-02-09 | $7700.00 | Window Closed / Lapsed |