Patent ID: 7463418

Claim:
A polarization element unit comprising: two or more wire grid polarization elements; a frame in which the polarization elements are aligned side by side; and a rotation unit including a first, second and third members, which are movable in a direction approximately parallel to a plane of at least one of the two or more wire grid polarization elements, wherein the at least one of the two or more polarization elements whose first side is in contact with the first member and whose second side is in contact with the second member and the third member, so that a grid direction of the at least one of the two or more wire grid polarization elements are adjusted with respect to an optical axis of light emitted onto a photo-alignment film from the linear light source approximately on the plane of the at least one of the two or more wire grid polarization elements by moving the first, second and third members in a direction approximately parallel to the plane of the at least one of the two or more polarization elements.