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Liquid crystal display illumination system

  • US 4,915,479 A
  • Filed: 12/08/1987
  • Issued: 04/10/1990
  • Est. Priority Date: 12/17/1986
  • Status: Expired due to Term
First Claim
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1. An illumination system for a liquid crystal display panel comprisinga liquid crystalline display panel,an extended area source of omnidirectional light,light conducting means for conducting said extended area of omnidirectional light from said source to said display panel, said light conducting means includingan extended transparent input face adjacent said source of omnidirectional light,an extended transparent output face directly adjacent to said display panel, said output face being larger in area than said input face, and said output face being convex toward said display panel, andtapered reflective side walls extending from said input face to said output face, said side walls being at an angle to said input face and said output face,wherein said output face passes collimated light directly into said liquid crystal display panel at smaller angles of divergence than light entering said input face from said source.

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