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Patent US4772943A successfully refreshed from Google Patents.
US4772943A
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US
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Virtual stereographic display system
Assignee: Sharp Corp
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Filing: 1987-02-17
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Granted: 1988-09-20
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Expires: 2007-02-17
Abstract
Abstract A virtual stereographic display system which includes a display image surface, a polarizer disposed before the display image surface, a liquid crystal cell in which ferroelectric smectic liquid crystal is aligned, and disposed before the polarizer, a driving circuit connected to the liquid crystal cell so as to apply AC voltage synchronized with the frame signal of the image on the display image surface to the liquid crystal cell and to switch over the, polarization axes of the display light proceeding from the display image surface through the polarizer and liquid crystal cell by time division, and polarizing glasses having different polarization axes for the left eye and right eye for viewing the display light.
Inventors
- 👤 Kenichi Nakagawa
- 👤 Kojiro Tsubota
- 👤 Kunihiko Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:39
CPC Classifications
G; G03; G03B; G03B35/00; G03B35/18; G03B35/24; G02; G02B; G02B30/00; G02B30/20; G02B30/22; G02B30/24; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/139; G02F1/141; H; H04; H04N; H04N13/00; H04N13/30; H04N13/332; H04N13/337; H04N13/341; H04N13/398
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
202 words
A virtual stereographic display system for supplying a stereographic image to an observer, comprising: display means for alternately displaying right eye information and left eye information by interleaving said display means with a first set of scanning lines containing right eye information and with a second set of scanning lines containing left eye information; synchronizing signal generating means for developing synchronizing signals in response to a transition between said right eye information and said left eye information supplied said display means from said first set of scanning lines and said second set of scanning lines, and optical means for allowing the right eye of the observer to view only said right eye information and the left eye of the observer to view only said left eye information, said optical means including right and left eye valve means for selectively transmitting said right eye information and said left eye information to the right and left eyes of the observer, said optical means switching said right eye valve means substantially transmissive while switching said left eye valve means substantially opaque, and switching said left eye valve means substantially transmissive while switching said right eye valve means substantially opaque in reponse to said synchronizing signals.
Claim 2
Dependent Claim
202 words
A virtual stereographic display system for supplying a stereographic image to an observer, comprising: display means for alternately displaying right eye information and left eye information by interleaving said display means with a first set of scanning lines containing right eye information and with a second set of scanning lines containing left eye information; synchronizing signal generating means for developing synchronizing signals in response to a transition between said right eye information and said left eye information supplied said display means from said first set of scanning lines and said second set of scanning lines, and optical means for allowing the right eye of the observer to view only said right eye information and the left eye of the observer to view only said left eye information, said optical means including right and left eye valve means for selectively transmitting said right eye information and said left eye information to the right and left eyes of the observer, said optical means switching said right eye valve means substantially transmissive while switching said left eye valve means substantially opaque, and switching said left eye valve means substantially transmissive while switching said right eye valve means substantially opaque in reponse to said synchronizing signals.
Claim 3
Dependent Claim
66 words
A virtual stereographic display system of claim 1, wherein said right and left eye valve means respectively comprise a right eye polarizing plate and a left eye polarizing plate having different polarization axes, said optical means further comprising a polarization control panel placed before said display means and selectively transmitting polarized light of different polarization axes from said display means in response to said synchronizing signals.
Claim 4
Dependent Claim
51 words
A virtual stereographic display system of claim 1, wherein said right and left eye valve means each include a cell of transient scattering mode liquid crystal being aligned or scattered in response to said synchronizing signals thereby selectively switching said right and left eye valve means substantially transmissive and substantially opaque.
Claim 5
Dependent Claim
18 words
A virtual stereographic display system of claim 3, wherein said cell is of a ferroelectric smectic liquid crystal.
Claim 6
Dependent Claim
43 words
A virtual stereographic display system of claim 1, wherein said synchronizing signal generating means comprises photosensor means for detecting brightness variations of said display means, said synchronizing signal generating means developing said synchronizing signals in response to an output of said photosensor means.
Claim 7
Dependent Claim
23 words
A virtual stereographic display system of claim 5, wherein said photosensor means detects brightness variations from a predetermined region of said display means.
Claim 8
Dependent Claim
16 words
A virtual stereographic display system of claim 5, wherein said photosensor means is a CdS cell.
Claim 9
Dependent Claim
15 words
A virtual stereographic display system of claim 5, wherein said photosensor means is a photodiode.
Claim 10
Dependent Claim
14 words
A virtual stereographic display system of claim 5, wherein said photosensor is a phototransistor.
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) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |