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High efficiency optical tank for three color liquid crystal light valve image projection with color selective prepolarization

  • US 4,461,542 A
  • Filed: 12/28/1981
  • Issued: 07/24/1984
  • Est. Priority Date: 12/28/1981
  • Status: Expired due to Term
First Claim
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1. A unitary optical arrangement comprising:

  • a first beamsplitter which splits incident light passing through a first surface into first and second beams, said first beam having a first color component and said second beam having second and third color components, respectively;

    a second beamsplitter mounted in optical alignment with said first beamsplitter which directs light of said first color to a second surface and modulated light from said second surface to a third surface;

    a third beamsplitter in optical alignment with said first beamsplitter which splits said second beam into third and fourth beams having first and second polarization states, respectively;

    a first filter which transmits light of the second color in the third beam to provide an output beam having the second color and the first polarization state;

    a second filter which transmits light of the third color in said fourth beam to provide an output beam having the second polarization state and the third color;

    means for combining the outputs of said first and second filters into a fifth beam; and

    a fourth beamsplitter which directs light in the fifth beam of the first polarization state a fourth surface, light of the second polarization state to a fifth surface and modulated light from said fourth and fifth surfaces to a sixth surface.

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