Abstract: An authenticity determination viewer including a first phase difference film, a linear polarizer, and a second phase difference film in this order, wherein a polarized light transmission axis of the linear polarizer and a slow axis of the first phase difference film are non-parallel to each other, and the polarized light transmission axis of the linear polarizer and a slow axis of the second phase difference film are non-parallel to each other.

Abstract: An authenticity determination viewer including a first phase difference film, a linear polarizer, and a second phase difference film in this order, wherein a polarized light transmission axis of the linear polarizer and a slow axis of the first phase difference film are non-parallel to each other, and the polarized light transmission axis of the linear polarizer and a slow axis of the second phase difference film are non-parallel to each other.

Abstract: Provided are a brightness enhancement film and a liquid crystal display device which has a high ability for enhancing a luminance, has a more excellent ability for improving a luminance unevenness than conventional ones and may reduce an occurrence of a color unevenness. The brightness enhancement film wherein a circular polarization separation element, an optically anisotropic element wherein a retardation in an in-plane direction Re is about one fourth of a transmitting light and a retardation in a thickness direction Rth is less than 0 nm and a periodic structure member having a repeating structure on a surface thereof are integrated in this order, and the liquid crystal display device comprising the same.