Projection display device
AssigneeKoninklijke Philips Electronics N. V.
InventorAdrianus Johannes Stephanes Maria De Vaan
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Abstract
The invention relates to a projection display device comprising an illumination system having a light source and an optical guiding means for providing an illumination beam, an image display system comprising a display panel for modulating the illumination beam with image information and projecting the image on a screen, and color filter means provided on a wheel, rotatably mounted at its hub, for transmitting colored portions of the illumination beam for illuminating the display panel. In order to simplify the manufacture of the projection display device, the color filter wheel is provided with one or more cholesteric layers for reflecting a portion of the illumination beam not having a predetermined color and having a circular polarization corresponding to a first direction.
Claims10
A projection display device comprising
- an illumination system having a light source and an optical guiding means for providing an illumination beam,
- color filter means comprising a color filter wheel for simultaneously scanning the display panel with different colored portions of the illumination beam, and
- an image display system having an image display panel for modulating the colored portions of the illumination beam with image information and projecting an image on a screen, characterized in that the color filter wheel comprises a cholesteric layer for reflecting a portion of the illumination beam not having a predetermined color and having a circular polarization corresponding to a first direction.
A projection display device as claimed in claim 8, characterized in that the image display panel comprises a digital micro-mirrored display panel.
A projection display device as claimed in any one of the preceding claims, characterized in that the color filter wheel comprises three respective color filter portions for simultaneously transmitting red, green and blue portions of the illumination beam.
Dependencies are inferred from the claim text.