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Image display element, and image display device

  • US 20030147112A1
  • Filed: 01/03/2003
  • Published: 08/07/2003
  • Est. Priority Date: 07/05/2000
  • Status: Active Grant
First Claim
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1. (Amended) An image display device comprising:

  • a polarization selective holographic optical device for diffracting illuminating light, said device including a plurality of each of two areas having refractive index values exhibiting respectively different incidence polarization orientation dependencies, said areas being layered sequentially alternately; and

    a reflection type spatial optical modulator for modulating the state of polarization of the illuminating light diffracted by said polarization selective holographic optical device;

    said polarization selective holographic optical device, one of two areas of which exhibits refractive index anisotropy, with the other exhibiting refractive index isotropy, being irradiated with the illuminating light at an angle of incidence not less than 30° and

    less than 90°

    with respect to a normal line to a light receiving surface thereof for said illuminating light, said polarization selective holographic optical device diffracting a P-polarized light component or an S-polarized light component of said illuminating light to radiate the diffracted light towards said reflection type spatial optical modulator;

    said polarization selective holographic optical device exhibiting the diffraction efficiency of not higher than 10% for the polarized light component of the illuminating light incident a second time thereon after phase modulation by said reflection type spatial optical modulator, which polarized light component has a direction of polarization perpendicular to a direction of polarization of the polarized light component diffracted thereby at the time when the illuminating light is first incident thereon, whereby not less than 70% of the first-stated polarization component is transmitted through the optical device.

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