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Illuminator with polarization separating anisotropic layer between light guide and reflector

  • US 5,808,709 A
  • Filed: 10/21/1996
  • Issued: 09/15/1998
  • Est. Priority Date: 10/24/1995
  • Status: Expired due to Fees
First Claim
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1. An illuminator comprising:

  • a light guide having a first surface and a second surface;

    a reflector arranged to reflect light, which has passed through the light guide and out of the first surface, through the first surface, the light guide and the second surface; and

    a first anisotropic layer disposed in contact with the first surface and between the light guide and the reflector for separating substantially all of a first polarization state from a second polarization state orthogonal to the first state, the first anisotropic layer having a first refractive index which is substantially equal to or greater than a refractive index of the light guide and a second refractive index which is less than the refractive index of the light guide.

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