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US4954890A
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Driving method for 3-D high luminance LCD projector
Assignee: LG Electronics Inc
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Filing: 1988-10-27
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Granted: 1990-09-04
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Expires: 2008-10-27
Abstract
Abstract Present invention employs two separate optical systems for left and right view images to be separately projected onto a screen for display by meams of respective light sources in the way of beaming a left view present image on the right view past image just prior displayed, and vice versa, to effect 3-D image and upgrade the brightness of the picture in display.
Inventors
- 👤 Hong C. Park
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:24
CPC Classifications
H; H04; H04N; H04N13/00; H04N13/30; H04N13/398; H04N13/332; H04N13/337; H04N13/341; H04N13/10; H04N13/106; H04N13/161; H04N13/363
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
184 words
In a 3-D image system employing a signal source for sequentially generating signals and alternately directing the sequentially generated signals to left and right image systems respectively, said image systems comprising left and right LCD projectors respectively for projecting images corresponding to the signals received onto a screen, a driving method for achieving high luminance 3-D with said projectors, said method comprising the steps of: projecting an image corresponding to a generated signal received by a selected one of the left and right image systems; memorizing the signal received by the selected image system; projecting by the other of said left and right image systems an image corresponding to the next sequentially generated signal and simultaneously projecting by the previously selected image system an image corresponding to the memorized signal such that one of the left and right image systems gives a present image signal, while the other of the left and right image systems gives again the memorized image just prior displayed, onto the screen by means of two respective light sources to upgrade the luminance of the 3-D image on the screen.
Claim 2
Dependent Claim
184 words
In a 3-D image system employing a signal source for sequentially generating signals and alternately directing the sequentially generated signals to left and right image systems respectively, said image systems comprising left and right LCD projectors respectively for projecting images corresponding to the signals received onto a screen, a driving method for achieving high luminance 3-D with said projectors, said method comprising the steps of: projecting an image corresponding to a generated signal received by a selected one of the left and right image systems; memorizing the signal received by the selected image system; projecting by the other of said left and right image systems an image corresponding to the next sequentially generated signal and simultaneously projecting by the previously selected image system an image corresponding to the memorized signal such that one of the left and right image systems gives a present image signal, while the other of the left and right image systems gives again the memorized image just prior displayed, onto the screen by means of two respective light sources to upgrade the luminance of the 3-D image on the screen.
Claim 3
Dependent Claim
32 words
Method as claimed in claim 1, in that SPS CCDs 25, 28 records the image signal of a field while giving an output of the prior recorded image signal of another field.
Claim 4
Independent Claim
54 words
A system for displaying/observing three-dimensional images including two image systems, where during production of a view of a momentary image by one image system the other image system produces a view of an immediately preceding image, the image systems defining LCD projectors having different polarization and directing their light beams onto a single screen.
Claim 5
Independent Claim
54 words
A system for displaying/observing three-dimensional images including two image systems, where during production of a view of a momentary image by one image system the other image system produces a view of an immediately preceding image, the image systems defining LCD projectors having different polarization and directing their light beams onto a single screen.
Claim 6
Dependent Claim
22 words
The system of claim 3, wherein each LCD projector comprises a light source and a liquid crystal plate sandwiched between two polarizers.
Claim 7
Dependent Claim
20 words
The system of claim 4, wherein one LCD projector emits S-polarized light and the other LCD projector emits P-polarized light.
Claim 8
Dependent Claim
40 words
The system of claim 5, wherein each image system includes means for storing an image signal corresponding to a present view upon receipt by the respective image system until projection of a stored image signal by the other image system.
Claim 9
Dependent Claim
42 words
The system of claim 6, wherein there is provided an image signal source alternatingly emitting image signals of a left view to a left one of the image systems and of a right view to a right one of the image systems.
Claim 10
Dependent Claim
27 words
The system of claim 7, wherein there is provided a switching means for alternatingly connecting the image signal source with the left or right image system respectively.
Claim 11
Dependent Claim
39 words
The system of claim 8, wherein the storing means are activated in synchronism with the change of the image signals from the image signal source for a writing and reading, respectively, the activation being caused by the switching means.
Claim 12
Dependent Claim
40 words
The system of claim 9, wherein the image signal source is connected to a demultiplexer switched over by the switching means in synchronism with the change of image signals and applying the respective image signal to the associated image system.
Claim 13
Dependent Claim
28 words
The system of claim 3, further comprising polarization glasses, and wherein a combined image produced by the left and right image systems is observable by the polarization glasses.
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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) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |