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Method of producing polarizing plate, and liquid crystal display comprising the polarizing plate

  • US 6,954,240 B2
  • Filed: 08/19/2004
  • Issued: 10/11/2005
  • Est. Priority Date: 10/16/2001
  • Status: Expired due to Term
First Claim
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1. A method of producing a polarizing plate comprising a polarizer and a protective layer bonded to at least one surface of the polarizer, wherein moisture content of the polarizer is in a range from 5% to 30% when the protective layer is bonded to the polarizer,wherein a surface roughness of the polarizing plate in a direction perpendicular to the stretching direction is 0.04 μ

  • m or less on the basis of the centerline average roughness, and wherein the polarizing plate has transmittance of at least 35% and a polarization degree of at least 90%, and wherein the moisture content of the polarizer is in a range from 15% to 30% when the protective layer is bonded to the polarizer, provided that the moisture content is obtained by a calculation based on an equation of moisture content (%)=[(A−

    B)/B]×

    100, where A denotes a weight of the polarizer before bonding and B denotes a weight of the polarizer after being kept in a dryer of 120°

    C. for seven hours.

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