Patent ID: 7339736

Claim:
A light polarizing film comprising: a linear polarizer having a first surface and a second surface and having a polarization direction wherein the polarization direction is about 45 degrees relative to a machine direction of the linear polarizer; a first optical retarder comprising a simultaneously biaxially oriented polypropylene film disposed adjacent to the first surface of the linear polarizer and having an axis oriented at an angle with respect to the polarization direction; an adhesive layer disposed between the first surface of the linear polarizer and the optical retarder and having a minimum adhesion strength of about 25 grams per inch; and a second optical retarder comprising a biaxially oriented polymer film disposed adjacent to the second surface of the linear polarizer and having an axis oriented at an angle with respect to the polarization direction, wherein the axis is oriented at a 45 degree angle to the polarization angle of the linear polarizer.