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US 2001/0055097 A1Published application
Color projection system
AssigneeKoninklijke Philips Electronics N.V.
InventorAdrianus Johannes Stephanes Maria De Vaan
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AssigneeKoninklijke Philips Electronics N.V.
InventorAdrianus Johannes Stephanes Maria De Vaan
Estimating the term…
A color projection system comprising a light source, a rotatable drum having a plurality of differently colored bands, and a light modulation panel onto which light beams reflected by the rotating colored bands can be directed. The color projection system also comprises means for directing the light beam from the light source onto a first plurality of juxtaposed bands, means for splitting the light beam on each band into light beams having complementary colors and different directions of polarization and reflecting said light beams, means for directing light beams having a first direction of polarization onto the light modulation panel and means for reflecting light beams having a second direction of polarization on a second plurality of bands of the drum, which second plurality of bands is shifted by at least one band with respect to the first plurality of bands.
A color projection system comprising a light source, a rotatable drum having a plurality of differently colored bands, and a light modulation panel on which light beams reflected by the colored bands can be directed by way of scrolling, characterized in that the color projection system further comprises means for directing the light beam from the light source onto a first plurality of juxtaposed bands, means for splitting and reflecting the light beam on each band into light beams having complementary colors and different directions of polarization, means for directing light beams having a first direction of polarization onto the light modulation panel, and means for reflecting light beams having a second direction of polarization onto a second plurality of bands of the drum, which second plurality of bands is shifted by at least one band with respect to the first plurality of bands.
A color projection system as claimed in any one of the preceding claims, characterized in that each band on the drum is provided with a dichroic layer, a subjacent ¼λlayer and a subjacent layer reflecting white light.
A color projection system as claimed in any one of the preceding claims, characterized in that the bands consecutively reflect the colors red, green and blue towards the light modulation panel.
A color projection system as claimed in any one of the preceding claims, characterized in that at least one white band is located between two colored bands.
A color projection system as claimed in any one of the preceding claims, characterized in that an integrator plate is located between the light source and the drum, which integrator plate comprises a plurality of lenses and reflecting surfaces located next to the lenses and directed towards the drum.
A color projection system as claimed in any one of the preceding claims, characterized in that a polarization conversion means is provided proximate to the light source.
Dependencies are inferred from the claim text.