Patent US5608467A successfully refreshed from Google Patents.
US5608467A
Expired / Lapsed
US
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Single panel color projection video display
Assignee: Philips North America LLC
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Filing: 1995-07-18
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Granted: 1997-03-04
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Expires: 2015-07-18
Abstract
Abstract A color projection video system utilizing only a single light valve. A white light source is separated into into red, green and blue bands. Scanning optics cause the RGB bands to be sequentially scanned across a light valve, such as a transmission LCD panel. Prior to each color passing over a given row of panels on the light valve, that row will be addressed, by the display electronics with the appropriate color content of that portion of the image which is being displayed. The image is projected by a projection lens onto a viewing surface, such as a screen. The sequence of light bands occurs so quickly as to give the viewer an appearance of simultaneous full color.
Inventors
- 👤 Peter J. Janssen
- 👤 Ralph H. Bradley
- 👤 Joseph P. Bingham
- 👤 William F. Guerinot
- 👤 Detlev Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:19
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3102; H04N9/3111; H04N9/3117; G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/133621; G02F1/133622; G09G2310/00; G09G2310/02; G09G2310/0235; G09G2310/0264; G09G2310/0297; G09G3/36; G09G3/3607
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
133 words
An apparatus having a circuitry for addressing a light valve that is to be illuminated by moving bands of first, second and third color in order to provide a full color display, said light valve including row and column drivers, said circuitry comprising: means for providing separate video signals corresponding to each of the first, second and third colors; delay means for delaying said separate video signals for varying amounts of time; serializing means for providing a single serial stream of signals corresponding to said first, second and third colors in sequential order; means for applying said serialized stream to the column drivers of said light valve; and means for activating said row drivers, said row drivers being activated in non-sequential order to correspond with the color bands being applied to the row.
Claim 2
Independent Claim
133 words
An apparatus having a circuitry for addressing a light valve that is to be illuminated by moving bands of first, second and third color in order to provide a full color display, said light valve including row and column drivers, said circuitry comprising: means for providing separate video signals corresponding to each of the first, second and third colors; delay means for delaying said separate video signals for varying amounts of time; serializing means for providing a single serial stream of signals corresponding to said first, second and third colors in sequential order; means for applying said serialized stream to the column drivers of said light valve; and means for activating said row drivers, said row drivers being activated in non-sequential order to correspond with the color bands being applied to the row.
Claim 3
Dependent Claim
38 words
The apparatus as claimed in claim 1 further including analog-to-digital converters disposed before said delay means and digital-to-analog converters disposed between said circuitry and said light valve so that the signal processing takes place in a digital format.
Claim 4
Dependent Claim
32 words
The circuitry as claimed in claim 1 wherein said video signals correspond to successive frames of the first, second and third colors, and said delay between colors comprises one-third of a frame.
Claim 5
Dependent Claim
26 words
The circuitry as claimed in claim 3 wherein said row drivers are activated one-third of a frame apart so as to track the bands of light.
Claim 6
Dependent Claim
31 words
The apparatus as claimed in claim 1 wherein said light valve includes four column drivers and said circuitry includes means for selectively applying said serialized stream to said four column drivers.
Claim 7
Dependent Claim
15 words
The circuitry as claimed in claim 1 wherein said row drivers comprise three row drivers.
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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) | 2000-03-03 | 2000-09-02 | 2001-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-03-03 | 2004-09-02 | 2005-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-03-03 | 2008-09-02 | 2009-03-04 | $7700.00 | Window Closed / Lapsed |