Patent US5005950A successfully refreshed from Google Patents.
US5005950A
Expired / Lapsed
US
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Giant liquid crystal display means
Assignee: Ministère des Postes Télégraphes et Téléphones
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Filing: 1989-06-15
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Granted: 1991-04-09
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Expires: 2009-06-15
Abstract
Abstract Giant liquid crystal display means. The means comprises projection modules (MP) associated with mirrors (M1, M2) and a large screen (E). The screen carries colored filters (R, G, B) and the liquid crystal displays are monochromatic. Application to the projection of large television or pictures.
Inventors
- 👤 Francois Morin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:36
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3141; H04N9/3147; G; G09; G09F; G09F19/00; G09F19/12; G09F19/18; G09F9/00; G09F9/30; G09F9/35
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
116 words
A giant display device comprising a large translucent screen having a front face directed toward an observer and a rear face covered by a mosaic of colored filters organized in triads of primary colors, a liquid crystal display device having a mosaic of pixels, a plurality of optical projection modules comprising a white light source and optical means for projecting an image of said mosaic of pixels of said liquid crystal display device onto said mosaic of colored filters on said rear face of said screen, each pixel of said mosaic of pixels of said liquid crystal display device being optically projected by said optical projection modules on one filter of said mosaic of colored filters.
Claim 2
Dependent Claim
116 words
A giant display device comprising a large translucent screen having a front face directed toward an observer and a rear face covered by a mosaic of colored filters organized in triads of primary colors, a liquid crystal display device having a mosaic of pixels, a plurality of optical projection modules comprising a white light source and optical means for projecting an image of said mosaic of pixels of said liquid crystal display device onto said mosaic of colored filters on said rear face of said screen, each pixel of said mosaic of pixels of said liquid crystal display device being optically projected by said optical projection modules on one filter of said mosaic of colored filters.
Claim 3
Dependent Claim
40 words
A giant display device according to claim 1, wherein said plurality of optical projection modules are juxtaposed in rows and columns, the images projected by said modules juxtaposed in rows and columns for forming a single image on said screen.
Claim 4
Dependent Claim
22 words
A giant display device according to claim 1, wherein said screen is constituted by a transparent support having a matte rear face.
Claim 5
Dependent Claim
24 words
A giant display device according to claim 1, wherein said screen comprises on its rear face a black matrix for separating said colored filters.
Claim 6
Dependent Claim
20 words
A giant display device according to claim 1, wherein said liquid crystal display device is of the active matrix type.
Claim 7
Dependent Claim
20 words
A giant display device according to claim 5, wherein said active matrix display is of the thin film transistor type.
Claim 8
Dependent Claim
33 words
A giant display device according to claim 5, wherein said colored filters are distributed in triangular form (R, G, B) and said liquid crystal display device comprises pixels also organized in triangular form.
Claim 9
Dependent Claim
71 words
A giant display device according to claim 1, wherein each optical projection module comprises, in front of said light source successively, a condenser, a double Fresnel lens, a first polarizer, a projection lens with an object focal plane in which is placed said liquid crystal display device, a first reflecting mirror, a second reflecting mirror, and a second polarizer, said screen being placed in the image plane of the projection lens.
Claim 10
Dependent Claim
21 words
A giant display device according to claim 8, wherein said second polarizer is placed against said rear face of said screen.
Claim 11
Dependent Claim
33 words
A giant display device according to claim 1, comprising further means for checking the light intensity projected by each projection module and means for controlling on return said intensity at an appropriate value.
References Cited (Backward Citations)
US2778871A
Cited
US3750136A
Cited
DE2555859A1
Cited
GB2024487A
Cited
US4368963A
Cited
JPS5530261A
Cited
US4562461A
Cited
DE3142664A1
Cited
US4791417A
Cited
US4613207A
Cited
US4679069A
Cited
US4901155A
Cited
US4806922A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-08 | 1994-10-08 | 1995-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-08 | 1998-10-08 | 1999-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-08 | 2002-10-08 | 2003-04-09 | $7700.00 | Window Closed / Lapsed |