Method for manufacturing optical display device and material roll for use therein

A method for manufacturing an optical display device including an optical display unit and an optical film that includes a polarizing plate and is bonded to the optical display unit, comprising the steps of:

• unwinding and feeding a long sheet material from a roll of the long sheet material, wherein the long sheet material includes the optical film, a pressure-sensitive adhesive layer and a release film laminated in this order, has defect information indentifying a defect position and has undergone a slitting process in a direction parallel to an absorption axis of the polarizing plate so that it has a width corresponding to a long side of the optical display unit;
• and
• cutting a part of the long sheet material other than the release film into a length corresponding to a short side of the optical display unit, while separating the defect based on the defect information;
• bonding a non-defective cut piece of the optical film to a surface of the optical display unit;
• and
• rejecting a defect-containing part of the optical film,
• wherein the separating the detected defect based on the defect information comprises:
• storing a position of the detected defect,
• determining an optical film bonding position,
• determining whether a distance between the position of the detected defect and the optical film bonding position is less than the length corresponding to the short side of the optical display unit, and
• judging that a corresponding portion of the fed optical film is defective when the distance between the position of the detected defect and the optical film bonding position is less than the length corresponding to the short side of the optical display unit.