US5504602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
LCD including a diffusing screen in a plane where emerging light from one pixel abuts light from adjacent pixels
Assignee: Sharp Corp
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Filing: 1993-10-08
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Granted: 1996-04-02
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Expires: 2013-10-08
Abstract
Abstract A projection apparatus for holographic stereogram recording has a transmissive liquid crystal device and a diffusion screen. The transmissive liquid crystal device has a microlens array on its incident side and a polarizing sheet on its transmitting side. The microlenses are in one to one correspondence with the pixels of the liquid crystal device. The position of the diffusion screen is chosen such that the image transmitted to it from the liquid crystal device appears continuous.
Inventors
- 👤 William J. Farmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:20
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/02; G03H1/26; G03H1/268; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133526; G03H2001/0208; G03H2001/0224; G03H2210/00; G03H2210/20; G03H2210/22; G03H2223/00; G03H2223/14; G03H2223/19; G03H2225/00; G03H2225/55
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
137 words
An apparatus for use in holographic stereogram recording, comprising: a transmissive liquid crystal device having a microlens array disposed on an incident side of said transmissive liquid crystal device, a liquid crystal layer, each pixel of which is provided with an entrance aperture and an exit aperture in such a manner that light from a microlens of said microlens array is made to run through the entrance aperture, focused in the pixel and made to diverge through the exit aperture and a polarizing sheet disposed on a transmitting side of said liquid crystal device; and a diffusing screen located in a plane where emerging light having diverged from a pixel through said polarizing sheet abuts light having diverged from adjacent pixels in such a manner that an image on said diffusing screen appears continuous without gridlike artifacts.
Claim 2
Independent Claim
137 words
An apparatus for use in holographic stereogram recording, comprising: a transmissive liquid crystal device having a microlens array disposed on an incident side of said transmissive liquid crystal device, a liquid crystal layer, each pixel of which is provided with an entrance aperture and an exit aperture in such a manner that light from a microlens of said microlens array is made to run through the entrance aperture, focused in the pixel and made to diverge through the exit aperture and a polarizing sheet disposed on a transmitting side of said liquid crystal device; and a diffusing screen located in a plane where emerging light having diverged from a pixel through said polarizing sheet abuts light having diverged from adjacent pixels in such a manner that an image on said diffusing screen appears continuous without gridlike artifacts.
Claim 3
Dependent Claim
61 words
An apparatus according to claim 1, further comprising a second microlens array being disposed on the transmitting side of said liquid crystal device, wherein the respective focal lengths and separation of said two microlens arrays are carefully controlled such that the output light field of said second microlens array is collimated thereby allowing increased freedom of placement to said diffusing screen.
Claim 4
Dependent Claim
38 words
An apparatus according to claim 2, wherein gaps exist between adjacent microlenses of said microlens arrays and a third microlens array is positioned a carefully controlled distance in front of said diffusing screen to produce the continuous image.
Claim 5
Dependent Claim
28 words
An apparatus according to claim 1, in which a projection lens system is used to project and magnify the plane of the continuous image onto said diffusing screen.
Claim 6
Dependent Claim
33 words
An apparatus according to claim 2, wherein one or more lenses is/are used to magnify the output image is/are between a liquid crystal device section and a diffusing screen section of said apparatus.
Claim 7
Dependent Claim
43 words
An apparatus according to claim 3, wherein one or more lenses used to magnify the output image are located between said second microlens array of the liquid crystal device section and said third microlens array of the diffusing screen section of said apparatus.
References Cited (Backward Citations)
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EP0440495A2
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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) | 1999-04-02 | 1999-10-02 | 2000-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-02 | 2003-10-02 | 2004-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-02 | 2007-10-02 | 2008-04-02 | $7700.00 | Window Closed / Lapsed |