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Liquid crystal display projector

  • US 5,653,520 A
  • Filed: 01/23/1996
  • Issued: 08/05/1997
  • Est. Priority Date: 01/23/1995
  • Status: Expired due to Fees
First Claim
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1. A liquid crystal display (LCD) projector, comprising:

  • a light source;

    a plurality of polarization beam-splitter prisms (PBSPs), arranged above and below and to the right and left of the optical axis positioned substantially at the center of a substantially parallel luminous flux emitted from the light source, for splitting the luminous flux into four areas above and below and to the right and left of the center of the flux and bringing to incidence the split beams on the four areas and having their polarization beam-splitting planes reflect part of the incident beam in directions away from the optical axis;

    polarized beam direction changing means for reflecting the polarized beams reflected by the polarization beam-splitting planes of the plurality of PBSPs to a direction substantially parallel to the optical axis;

    phase changing means for changing each of the phases of the polarized beams reflected by the polarization beam-splitting planes of said plurality of PBSPs by 90 degrees; and

    a liquid crystal display (LCD) panel irradiated in its upper, lower, left and right peripheral areas with the luminous flux having passed the polarized beam direction changing means and the phase changing means and irradiated all over with the luminous flux transmitted by the polarization beam-splitting planes of said plurality of PBSPs.

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