Patent ID: 9733400
Date: 2017-08-15
CPC Classifications: G02B

Claim:
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 horizontal plane between the first structured major surface and the second major surface, wherein the reference horizontal plane is substantially perpendicular to the thickness direction of the light directing film, wherein the first structured major surface comprises a plurality of prisms, wherein each of the plurality of prisms comprises a first lateral surface, a second lateral surface, a third lateral surface and a fourth lateral surface, wherein the first lateral surface and the second lateral surface intersect to form a ridge extending from the third lateral surface to the fourth lateral surface, wherein each of the ridges of the plurality of prisms has a non-linear projection on the reference horizontal plane, wherein the sectional diagram of the plurality of prisms defines a plurality of valleys interleaved with the ridges of the plurality of prisms, wherein the plurality of valleys comprises a first valley and a second valley, wherein the distance between the first valley and the reference horizontal plane is different from the distance between the second valley and the reference horizontal plane.