The present disclosure is directed to optical films having a first surface and a structured surface, the structured surface comprising a plurality of prismatic structures. Each prismatic structure has a base including at least two first sides and at least two second sides. At least one of the first and...http://www.google.fr/patents/US7220026?utm_source=gb-gplus-shareBrevet US7220026 - Optical film having a structured surface with offset prismatic structures
Optical film having a structured surface with offset prismatic structures
