Patent US4928123A successfully refreshed from Google Patents.
US4928123A
Expired / Lapsed
US
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Projection type liquid crystal display device
Assignee: Sharp Corp
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Filing: 1988-06-15
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Granted: 1990-05-22
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Expires: 2008-06-15
Abstract
Abstract A projection type liquid crystal display device comprising a projector including a liquid crystal display element and a first polarizing plate for projecting an image displayed by the liquid crystal display element after polarization, the first polarizing plate for applying a specific polarized light component, and a screen on which the image projected by the projector is presented, wherein second polarizing plate is formed on the surface of the screen.
Inventors
- 👤 Yutaka Takafuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:27
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/1313; H; H04; H04N; H04N5/00; H04N5/74; H04N5/7416; H04N5/7441
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
122 words
A liquid crystal display device comprising: a display screen; and a projector for projecting an image on said display screen; said projector including, a light source developing a light beam, a polarizing beam splitter polarizing said light beam in a first polarizing direction, a liquid crystal display modulating said light beam polarized by said polarizing beam splitter to form the image to be projected; said display screen including, polarizing means for polarizing said image projected by said projector, said polarizing means being arranged orthogonally to the first polarizing direction of said light beam polarized by said polarizing beam splitter, and a lenticulated sheet lenticulated orthogonally to said polarizing means for preventing scattering of light in a vertical direction of the display screen.
Claim 2
Dependent Claim
122 words
A liquid crystal display device comprising: a display screen; and a projector for projecting an image on said display screen; said projector including, a light source developing a light beam, a polarizing beam splitter polarizing said light beam in a first polarizing direction, a liquid crystal display modulating said light beam polarized by said polarizing beam splitter to form the image to be projected; said display screen including, polarizing means for polarizing said image projected by said projector, said polarizing means being arranged orthogonally to the first polarizing direction of said light beam polarized by said polarizing beam splitter, and a lenticulated sheet lenticulated orthogonally to said polarizing means for preventing scattering of light in a vertical direction of the display screen.
Claim 3
Dependent Claim
14 words
The device of claim 1, wherein said display screen is a transmissive type screen.
Claim 4
Dependent Claim
25 words
The device of claim 1, wherein said polarizing means provided on the screen reduces the amount of light incident to the screen from the environment.
Claim 5
Dependent Claim
21 words
The device of claim 1, wherein the projector further includes a condenser lens, a heat absorbing filter and a projection lens.
Claim 6
Dependent Claim
23 words
The device of claim 1, wherein said display screen includes a light reflecting layer, said polarizing means disposed over the light reflecting layer.
Claim 7
Dependent Claim
20 words
The device of claim 5, wherein said lenticulated sheet is formed between said light reflecting layer and said polarizing means.
Claim 8
Dependent Claim
35 words
The device of claim 1, wherein the polarized light beam polarized by said polarizing beam splitter is a light component selected from a group consisting of a P-polarized light component and an S-polarized light component.
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) | 1993-05-21 | 1993-11-20 | 1994-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-21 | 1997-11-20 | 1998-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-21 | 2001-11-20 | 2002-05-22 | $7700.00 | Window Closed / Lapsed |