Digital image projector with oriented fixed-polarization-axis polarizing beamsplitter
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United States of America Patent
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-
Jan 28, 2003
Grant Date -
Dec 5, 2002
app pub date -
Jun 2, 2001
filing date -
Jun 2, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A digital image projector includes an illumination-light source lamp and illumination beam forming optics for forming a white-spectrum illumination beam and color-band-separation optics to divide the illumination beam into color-component subbeams. The digital image projector also includes a reflective digital-image-encoding polarization modulator mechanism such as a reflective liquid crystal display polarization modulator to reflectively modulate the linearly polarized subbeams to form color-component image encoded-polarization subbeams and projection lens optics for projecting a color image divided from the image encoded-polarization subbeams. The digital image projector further includes a plate-supported, surface mounted fixed polarization-axis polarizing beamsplitter such as a wire-grid polarizing beamsplitter for dividing the color image from the image-encoded-polarization subbeams in which a polarizer support plate of the polarizing beamsplitter faces an illumination-source side of the optical system of the projector.
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