Optical film material roll and method for manufacturing image display device using thereof
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United States of America Patent
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Sep 2, 2014
Grant Date -
Aug 9, 2012
app pub date -
Apr 16, 2012
filing date -
Apr 10, 2009
priority date (Note) -
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Abstract
Disclosed is a material roll that includes a roll of an optical film having defect information markings printed thereon and is resistant to the formation of a defect by the transfer of a bump/dent deformation at the marking site. The material roll includes a long sheet of an optical film with polarizer wound into roll shape; and marking(s) formed at or in a vicinity of at least one defect site. The marking has an optical density of 1.5 or more, and a thickness of a center part of the marking is 1.5 μm or less. The marking preferably has an optical density per unit thickness of 2.5 μm−1 or more.
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