US 9,810,818 B2
Optical film
Kong-Hua Wang, Taoyuan County (TW); Ching-An Yang, Taoyuan County (TW); and Han-Tsung Pan, Taoyuan County (TW)
Assigned to UBright Optronics Corporation, Taoyuan (TW)
Filed by UBRIGHT OPTRONICS CORPORATION, Taoyuan County (TW)
Filed on Apr. 12, 2016, as Appl. No. 15/96,288.
Application 15/096,288 is a continuation in part of application No. 13/973,821, filed on Aug. 22, 2013, granted, now 9,341,755.
Claims priority of provisional application 61/692,199, filed on Aug. 22, 2012.
Prior Publication US 2016/0252661 A1, Sep. 1, 2016
Int. Cl. G02B 5/04 (2006.01); F21V 8/00 (2006.01)
CPC G02B 5/045 (2013.01) [G02B 6/0053 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical 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 optical film, wherein the first structured major surface comprises a first prism and a second prism wherein the first prism has a first lateral surface and a second lateral surface intersecting to form a first ridge extending substantially along a first direction, and the second prism has a third lateral surface and a fourth lateral surface intersecting to form a second ridge extending substantially along the first direction, wherein the second lateral surface of the first prism is adjacent to the the third lateral surface of the second prism, wherein the first ridge of the first prism has a first height relative to the reference plane and the second ridge of the second prism has a second height relative to the reference plane, wherein the first height of the first ridge of the first prism varies along the first direction, wherein the maximum of the first height is larger than the maximum of the second height.