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Backlighting device

  • US 5,289,351 A
  • Filed: 03/19/1992
  • Issued: 02/22/1994
  • Est. Priority Date: 03/22/1991
  • Status: Expired due to Term
First Claim
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1. A backlighting device for display panels, comprising:

  • a light-conducting plate comprising a light-transmissive material, said light-conducting plate having a light-diffusing material disposed thereon;

    one of a specular reflecting plate and a light diffusing/reflecting plate that covers an entire bottom surface of the light-conducting plate; and

    a linear light source provided in proximity to an end portion of at least one side of said light-conducting plate for propagating light along the entire light-conducting plate;

    wherein said light-conducting plate includes an exit face opposite said bottom surface and having positioned thereon at least one film of a light-transmissive material, said film having an entrance face and an exit face, said exit face of said film being coarser grained than on said entrance face of said film, said entrance face of said film being closer to said light-conducting plate than said exit face of said film.

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