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Transflective LCD utilizing chiral liquid crystal filter/mirrors

  • US 5,841,494 A
  • Filed: 06/26/1996
  • Issued: 11/24/1998
  • Est. Priority Date: 06/26/1996
  • Status: Expired due to Fees
First Claim
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1. A spatial display means composed of:

  • A first light polarizing filter, andan array of polarization modulation cells, anda multi-element chiral liquid crystal filter/mirror, anda second light polarizing filter, anda light source, whereinambient room light being polarized by said first light polarizing filter passes into said array of polarization modulating cells, said cells having a first switched state that transmits at least one color of said light in a first polarization state and said cells having a second switched state that transforms at least said one color of light to a second polarization state, withlight of said first or second polarization states being imposed upon said multi-element chiral liquid crystal filter/mirror, andsaid liquid crystal filter/mirror providing transmission of said light of at least one color, being of said first polarization state, withsaid transmitted light being either absorbed by said second polarizing filter or passed into said light source, andsaid liquid crystal filter/mirror providing reflection of said light of at least one color, being of said second polarization state, withsaid reflected light transiting said polarization modulation cell and said first polarizing filter to a viewer, andsaid spatial display means having the option to activate said light source, whereupon,light from said light source, being of at least one specific color, is polarized by said second polarizing filter, andtransits said multi-element chiral liquid crystal filter/mirror into,said array of polarization modulation cells, said cells having a first switched state that transmits said light in a first polarization state and said cells having a second switched state that transforms said light to a second polarization state, withsaid light of said first or second polarization states being imposed upon said first polarizing filter, whereuponlight of said first polarization state is absorbed by said first polarizing filter and light of said second polarization state is transmitted to a viewer.

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