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Liquid crystal projector including a polaration rotating element

  • US 5,299,036 A
  • Filed: 11/08/1991
  • Issued: 03/29/1994
  • Est. Priority Date: 11/09/1990
  • Status: Expired due to Term
First Claim
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1. An image projector comprising:

  • at least one source of light;

    a liquid crystal matrix screen;

    a polarization direction rotating element;

    a polarization separator separating the light into first and second polarized beams having directions of polarization that are orthogonal with respect to each other, the first and second polarized beams being modulated by the liquid crystal matrix screen after one of said first and second polarized beams has passed through the polarization direction rotating element;

    first means for achieving at least two reflections for each of said first and second polarized beams, said first means including first and second reflectors for reflecting the first and second polarized beams, respectively, toward an optical axis on which the liquid crystal matrix screen is centered and third and fourth reflectors for reflecting the first and second polarized beams, respectively, toward the liquid crystal matrix screen; and

    second means for converging the first and second polarized beams on at least a part of the paths of the first and second polarized means between the polarization separator and the liquid crystal matrix screen, so that each of said first and second polarized beams forms an image of the light source between the third and fourth reflectors and the liquid crystal matrix screen.

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