LIGHT DIFFUSING FILM, METHOD FOR MANUFACTURING SAME, AND POLARIZING PLATE, ROLL-SHAPED POLARIZING PLATE, AND LIQUID CRYSTAL DISPLAY DEVICE WHICH EMPLOY SAME

摘要

Disclosed is a light diffusing film which is improved to provide adequate moisture permeability and outstanding productivity, and reduced in variations of brightness and adhesion. Also disclosed is a method for manufacturing the light diffusing film. Further disclosed are a polarizing plate, a roll-shaped polarizing plate, and a liquid crystal display device, which employ the light diffusing film. The light diffusing film diffuses beams of light from a light source, and has a structure of bumps and dips at least on one of the surfaces of the light diffusing film. The light diffusing film is characterized in that in a Fourier transform image that is based on an image acquired by measuring the structure of bumps and dips under a 3D measurement laser microscope, the average pitch of the bumps and dips falls in the range of 50nm to 3µm and the average value of the differences (depths) between the highest point of a bump and the lowest point of a dip falls in the range of 5nm to 5µm.