Patent ID: 6291035
Filing Date: 2001-09-18
Classification: C09K,G02B,G02F

Abstract:
An optical retardation film exhibiting a tilted and splayed structure, comprising:first and second layers of an anisotropic polymer that are adjacent to each other or adjacent to opposite sides of a common substrate, characterized in that the first and second layers exhibit a tilted structure with an optical symmetry axis having a tilt angle .theta. relative to, respectively, the plane of the first or second layer, and the tilt angle .theta. in said first or second layer varies continuously in a direction normal to, respectively, the first or second layer, starting from a minimum value .theta..sub.min at the side of the layer facing the second layer or vice versa: or, if present, the common substrate, and ranging to a maximum value .theta..sub.max on the opposite side of the first or second layer, or vice versa;wherein a sense of variation of the tilt angle is clockwise in the first of said layers and counterclockwise in the second of said layers, or vice versa, when going from low tilt values to high tilt values and from a side view perspective; andwherein a projection of the optical symmetry axis of the first layer into the plane of the first layer and a projection of the optical symmetry axis of the second layer into the plane of the second layer are substantially parallel to each other.