Method of producing polarizing plate, and liquid crystal display comprising the polarizing plate
First Claim
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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Abstract
A polarizing plate produced according to the present invention includes a polarizing film and a protective layer bonded to a surface of the polarizing film, where the protective layer has no irregularities like record grooves caused by stretching of the polarizing film, so that the polarizing plate with an improved appearance provides clear images even when reflected light is applied. Such a polarizing plate is produced by laminating a protective layer on at least one surface of a polarizer while limiting moisture content of the polarizer to a range from 5% to 30%. A value for the moisture content is obtained by a calculation based on an equation of moisture content (%)=[(A−B)/B]×100, when A denotes weight of the polarizer before bonding and B denotes weight of the polarizer after being kept in a dryer of 120° C. for seven hours.
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Citations
33 Claims
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- 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
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12. A liquid crystal display comprising a liquid crystal cell and a polarizing plate bonded to at least one surface of the liquid crystal cell,
wherein the polarizing plate comprises a protective layer bonded to at least one surface of a polarizer when moisture content of the polarizer is in a range from 5% to 30%, 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 having transmittance of at least 35% and a polarization degree of at least 90% comprises a protective layer bonded to at least one surface of a polarizer, when moisture content of the polarizer is in a range from 15 to 20%, 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. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
- m or less on the basis of the centerline average roughness, and
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23. 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 0.01 μ
- m or less on the basis of the centerline average roughness.
- View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
Specification