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Transmission type screen, image display method for transmission type screen, and projection display apparatus

  • US 8,553,325 B2
  • Filed: 10/20/2010
  • Issued: 10/08/2013
  • Est. Priority Date: 04/26/2010
  • Status: Expired due to Fees
First Claim
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1. A transmission type screen used for a rear projection type display apparatus for projecting image light from a rear surface thereof as seen from a viewer, comprising:

  • a Fresnel lens screen for bending the image light from an emitter toward the viewer; and

    an image display element for imaging the image light from the Fresnel lens screen and expanding the image light at a dispersion angle,wherein the Fresnel lens screen includes;

    a Fresnel optical element including a prism formed on an incident surface side as seen from the emitter; and

    first light diffusion means for diffusing the image light passing through the Fresnel optical element, andwherein the image display element includes;

    a lens element for spatially dividing the image light from the Fresnel lens screen and changing a direction of the image light;

    a birefringent layer provided at a subsequent stage of the lens element, for mixing image light obtained by spatial division by the lens element; and

    second light diffusion means provided at a subsequent stage of the birefringent layer, for diffusing the image light passing through the birefringent layer.

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