Patent ID: 9366875
Filing Date: 2016-06-14
CPC Classification: G02B,G02F

Claim Text:
1. A light directing film comprising a first structured major surface, a second major surface opposite to the first structured major surface and a reference plane between the first structured major surface and the second major surface, wherein the reference plane is substantially perpendicular to the thickness direction of the light directing film, wherein the first structured major surface comprises a first prism element and a second prism element extending substantially in a first direction, wherein a first ridge of the first prism element has a first height relative to the reference plane and a second ridge of the second prism element has a second height relative to the reference plane, wherein the first height of the first ridge of the first prism element varies along the first direction and the second height of the second ridge of the second prism element varies along the first direction, wherein the maximum of the first height is larger than the maximum of the second height and the minimum of the first height is less than the maximum of the second height.