Patent US5576725A successfully refreshed from Google Patents.
US5576725A
Expired / Lapsed
US
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Image display device
Assignee: Sony Corp
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Filing: 1993-12-16
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Granted: 1996-11-19
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Expires: 2013-12-16
Abstract
Abstract A picture display device includes, as picture projecting components, a light source unit 3 for radiating a light beam, a liquid crystal device 4 for splitting and distributing the light beam in accordance with picture signals, that is fractional picture signals associated with respective fractional pictures, a reflecting plate 6 for reflecting the light beam for guiding the reflected light beam towards the rear surface of the liquid crystal device 4, and a projection lens 5 for forming an image of each fractional picture produced by radiating the reflected light beam from the rear surface of the liquid crystal device 4. A plurality of sets of the above-described picture projecting components are provided in association with respective fractional pictures making up a full screen size picture. With the picture display device, high-quality picture display may be made with a display screen of a large size and a reduced thickness.
Inventors
- 👤 Satoshi Shimada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:27
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3141; H04N9/3147
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
170 words
An image display device comprising: a plurality of image projection means for projecting a plurality of fractional images on a screen, said plurality of fractional images, as displayed by said image display means on the screen, being synthesized in a manner wherein a screen-size image is displayed; means for projecting said fractional images on said screen so that adjacent fractional images are projected with overlapping portions, and gradual decrease type projection angle control means, including a light attenuator, for gradually decreasing the light in said overlapping portions for providing uniform lightness of said overlapping portions of the adjacent fractional images as displayed on said screen; wherein said light attenuator comprises an optical attenuator which comprises an optical aperture device for gradually decreasing the light in the overlapping portion of adjacent fractional images, and wherein said image projection means includes a projection lens and said optical attenuator device comprises at least two aperture devices, one positioned in front of and one behind said projection lens in the direction of said screen.
Claim 2
Dependent Claim
170 words
An image display device comprising: a plurality of image projection means for projecting a plurality of fractional images on a screen, said plurality of fractional images, as displayed by said image display means on the screen, being synthesized in a manner wherein a screen-size image is displayed; means for projecting said fractional images on said screen so that adjacent fractional images are projected with overlapping portions, and gradual decrease type projection angle control means, including a light attenuator, for gradually decreasing the light in said overlapping portions for providing uniform lightness of said overlapping portions of the adjacent fractional images as displayed on said screen; wherein said light attenuator comprises an optical attenuator which comprises an optical aperture device for gradually decreasing the light in the overlapping portion of adjacent fractional images, and wherein said image projection means includes a projection lens and said optical attenuator device comprises at least two aperture devices, one positioned in front of and one behind said projection lens in the direction of said screen.
Claim 3
Dependent Claim
17 words
The image display device according to claim 1 wherein said optical attenuator device comprises three aperture devices.
Claim 4
Dependent Claim
15 words
The image display device according to claim 1 wherein said aperture device includes square-shaped apertures.
Claim 5
Dependent Claim
14 words
The image display according to claim 1 wherein said aperture device includes slit-shaped apertures.
Claim 6
Dependent Claim
130 words
An image display device comprising: a plurality of image projection means for projecting a plurality of fractional images on a screen so that adjacent fractional images are projected with overlapping portions, said plurality of fractional images, as displayed by said image display means on the screen, being synthesized in a manner wherein a screen-size image is displayed, each of said image projection means including a projection lens; and a plurality of light attenuator means for gradually decreasing the light in said overlapping portions for providing uniform lightness of said overlapping portions of the adjacent fractional images as displayed on said screen, each of said light attenuator means comprising at least two aperture devices, one positioned in front of and one behind said projection lens in the direction of said screen.
Claim 7
Dependent Claim
130 words
An image display device comprising: a plurality of image projection means for projecting a plurality of fractional images on a screen so that adjacent fractional images are projected with overlapping portions, said plurality of fractional images, as displayed by said image display means on the screen, being synthesized in a manner wherein a screen-size image is displayed, each of said image projection means including a projection lens; and a plurality of light attenuator means for gradually decreasing the light in said overlapping portions for providing uniform lightness of said overlapping portions of the adjacent fractional images as displayed on said screen, each of said light attenuator means comprising at least two aperture devices, one positioned in front of and one behind said projection lens in the direction of said screen.
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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) | 1999-11-19 | 2000-05-20 | 2000-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-11-19 | 2004-05-20 | 2004-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-11-19 | 2008-05-20 | 2008-11-19 | $7700.00 | Window Closed / Lapsed |