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Light-scattering substrate, method for manufacturing light-scattering substrate, polarizing plate and image display device

  • US 8,643,808 B2
  • Filed: 04/29/2010
  • Issued: 02/04/2014
  • Est. Priority Date: 04/30/2009
  • Status: Active Grant
First Claim
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1. A light-scattering substrate having an irregular shape on one surface thereof, the light-scattering substrate comprising:

  • a thermoplastic resin; and

    at least one kind of transparent particles having a mean primary particle size of 3 μ

    m or more and not more than 12 μ

    m,wherein the light-scattering substrate contains a first region having a thickness of ½

    or more times and not more than 4 times the mean primary particle size of the transparent particles from the surface having an irregular shape; and

    a second region having a thickness of 3/2 or more times the mean primary particle size of the transparent particles from a surface on back side of the surface having an irregular shape,wherein the first region and the second region have a region not substantially containing the transparent particles, andwherein a tilt angle of irregularities of the surface of the light-scattering substrate having an irregular shape has the following distribution;

    (a) an integrated value of the frequency of 0°

    or more and less than 0.5°

    is less than 25%;

    (b) an integrated value of the frequency of 0.5°

    or more and less than 10°

    is 65% or more and less than 100%; and

    (c) an integrated value of the frequency of 10°

    or more is 0% or more and less than 20%.

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