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Light Diffusion Module and a Back Light Module Using the Same

  • US 20090316073A1
  • Filed: 08/28/2009
  • Published: 12/24/2009
  • Est. Priority Date: 01/20/2006
  • Status: Active Grant
First Claim
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1. A light diffusion module for use with a back light module, comprising:

  • a first diffusion layer including a bottom light entrance surface and a top light exit surface, wherein said top light exit surface has a plurality of first micro structures juxtapositioned to each other, at least a part of said first micro structures have a first height; and

    a second diffusion layer disposed above said first diffusion layer, including a bottom surface and a top surface, wherein said bottom surface is disposed opposite to said top light exit surface of said first diffusion layer, said top surface has a plurality of second micro structures juxtapositioned to each other, at least a part of said second micro structure have a second height;

    wherein a ratio of said first height to said second height is between 0.8 and 1.5.

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