Patent ID: 8089569

Claim:
A phase difference element comprising: a base film having optical anisotropy; and a phase difference layer having optical anisotropy formed on the base film, wherein the phase difference layer has two kinds of phase difference regions with slow axes having different directions from each other, the two kinds of phase difference regions are adjacently and regularly arranged in an in-plane direction of the base film, the two kinds of the phase difference regions each have retardation of λ/4, each of the phase difference regions has the slow axis in a direction intersecting with a border with an adjacent phase difference region at an angle other than a right angle, in the case where a slow axis of one of the two kinds of phase difference regions is a first slow axis and a slow axis of the other of the two kinds of phase difference regions is a second slow axis, a bisector of the first slow axis and the second slow axis is parallel to a slow axis of the base film, and the base film has a slow axis in a direction parallel or orthogonal to the border.