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Illumination system and display device

  • US 5,822,029 A
  • Filed: 12/29/1995
  • Issued: 10/13/1998
  • Est. Priority Date: 12/29/1994
  • Status: Expired due to Term
First Claim
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1. An illumination system comprising:

  • a polarized light source for emitting circularly polarized light;

    a cholesteric filter having a first region which transmits circularly polarized light of a wavelength falling within a first predetermined band and reflects light having a wavelength falling outside of the first band, and a second region which transmits circularly polarized light of a wavelength falling within a second predetermined band different from the first predetermined band and reflects light having a wavelength falling outside of the second band; and

    a reflector for returning the light reflected by the cholesteric filter towards the cholesteric filter, wherein the boundary between the first region and the second region is a plane parallel to a direction of illumination.

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