Patent ID: 8469579
Filing Date: 2013-06-25
Classification: G02B

Abstract:
1. An optical plate, comprising: a base comprising a first surface and a second surface at opposite sides thereof; and a plurality of micro-structures provided at the first surface; wherein each micro-structure defines a base surface substantially coplanar with the first surface of the base, and two side surfaces, the base surface has an approximately olive-shaped profile enclosed by two arc-outlines, and the two side surfaces extend obliquely from the two arc-outlines and intersect at a ridge of the micro-structure; wherein the base surface defines a long axis and a short axis, a three-dimensional (3-D) Cartesian coordinate system is defined with the long axis coinciding with the X axis, the short axis coinciding with the Y axis, the intersection of the X axis and the Y axis coinciding with the origin, and the direction of the Z axis being the direction of the extension of the micro-structure perpendicularly up from the base surface, and a path defining the shape of the base surface satisfies the following equation: wherein, x and y are Cartesian coordinates of any point along the path, A, y 0 , x c , w 1 , w 2 , w 3 and S are constants, and A, y 0 , x c , w 1 , w 2 , w 3 and S satisfy the following ranges: −13.549<y 0 <−9.549, −213.5<x<213.5, −1.0<x c <1.0, 62.754<A<72.754, 45.72<w 1 <280.2, 8.01<w 2 <53.03, 8.01<w 3 <53.03, and 0.1<S<3.