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Optical sheet and display device having the optical sheet

  • US 6,822,707 B2
  • Filed: 10/08/2002
  • Issued: 11/23/2004
  • Est. Priority Date: 10/11/2001
  • Status: Expired due to Fees
First Claim
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1. An optical sheet comprising:

  • a transparent base material;

    a fine lens array constituted by a plurality of fine unit lenses formed on a front surface of said transparent base material;

    a diffusing layer formed on a rear surface of said transparent base material opposite to said surface on which said fine lens array is formed; and

    a light absorbing layer formed on said diffusing layer and including fine opening portions substantially located at focal points of said unit lenses;

    wherein said diffusing layer is made of a transparent medium containing transparent fine particles different in refractive index from said transparent medium, and said transparent fine particles have a mean particle size in a particle size range for maximizing a value of Q/R at each of wavelengths in a visible region when Q is a scattering sectional area per transparent fine particle, and R is a radius of each of said transparent fine particles.

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