OPTICAL FILM, POLARIZING PLATE, IMAGE DISPLAY DEVICE, AND OPTICAL FILM SELECTION METHOD

摘要

Provided is an optical film whereby rainbow unevenness when viewed with the naked eye can be suppressed, without increasing in-plane phase difference.　The optical film has a low-refractive-index layer upon a plastic film. The plastic film is a biaxially stretched plastic film having an in-plane phase difference of no more than 2,500 nm and the low-refractive-index layer is positioned on the outermost surface. In the optical film, when ΔEab is calculated from the difference between an L* value, a* value, and b* value when a laminate 1 including the optical film, a polarizer, and a planar light source is measured under prescribed conditions and an L* value, a* value, and b* value when a laminate 2 including the polarizer and the planar light source is measured under prescribed conditions, ΔEab has a region fulfilling prescribed conditions.