US6257728B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color projection system
Assignee: US Philips Corp
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Filing: 2000-04-19
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Granted: 2001-07-10
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Expires: 2020-04-19
Abstract
Abstract Color projection system includes a light source, an integrator plate arranged in front of the light source and having a plurality of juxtaposed lens elements, an electro-optical light modulation panel arranged in front of the integrator plate, a projection lens preceding the light modulation panel, and a movable color filter which is provided with a plurality of parallel extending, differently colored strips. The color filter is located opposite the integrator plate, which color filter and integrator plate are movable relative to each other in a direction extending parallel to the integrator plate, while at least two differently colored strips are located opposite each lens element, while strips of the same color have the same position with respect to each lens element.
Inventors
- 👤 Anthonie H. Bergman
- 👤 Serge J. A. Bierhuizen
- 👤 Jeffrey A. Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:42
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3102; H04N9/3111; H04N9/3117
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
133 words
A color projection system comprising at least a light source, at least an integrator plate arranged in front of the light source and comprising a plurality of juxtaposed lens elements, an electro-optical light modulation panel arranged in front of the integrator plate, at least a projection lens preceding the light modulation panel, and a movable color filter which is provided with a plurality of parallel extending, differently colored strips, characterized in that the color filter is located opposite the integrator plate, the color filter and the integrator plate being movable relative to each other in a direction extending parallel to the plane of integrator plate, while at least two differently colored strips are located opposite each lens element, strips of the same color having the same orientation with respect to each lens element.
Claim 2
Dependent Claim
133 words
A color projection system comprising at least a light source, at least an integrator plate arranged in front of the light source and comprising a plurality of juxtaposed lens elements, an electro-optical light modulation panel arranged in front of the integrator plate, at least a projection lens preceding the light modulation panel, and a movable color filter which is provided with a plurality of parallel extending, differently colored strips, characterized in that the color filter is located opposite the integrator plate, the color filter and the integrator plate being movable relative to each other in a direction extending parallel to the plane of integrator plate, while at least two differently colored strips are located opposite each lens element, strips of the same color having the same orientation with respect to each lens element.
Claim 3
Dependent Claim
43 words
A color projection system as claimed in claim 1 , characterized in that the color filter is movable in a first direction transverse to the colored strips and parallel to the integrator plate, and in a second direction opposite to the first direction.
Claim 4
Dependent Claim
48 words
A color projection system as claimed in claim 1 wherein a part of the light from the light source is passed by the colored strip, while the light not passing through the color filter is reflected back by the colored strip into the direction of the light source.
Claim 5
Dependent Claim
26 words
A color projection system as claimed in claim 1 wherein the color filter is movable in the second direction substantially faster than in the first direction.
Claim 6
Dependent Claim
23 words
A color projection system as claimed in claim 1 wherein the color filter is located between the light source and the integrator plate.
Claim 7
Dependent Claim
22 words
A color projection system as claimed in claim 1 wherein at least three differently colored strips are located opposite each lens element.
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) | 2004-07-09 | 2005-01-08 | 2005-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-07-09 | 2009-01-08 | 2009-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-07-09 | 2013-01-08 | 2013-07-10 | $7700.00 | Window Closed / Lapsed |