Described is an optical film having a structured surface including a plurality of prismatic structures. Each prismatic structure has a base including at least two longer sides disposed opposite to each other along a first general direction and at least two shorter sides disposed opposite to each other...http://www.google.fr/patents/US20060103777?utm_source=gb-gplus-shareBrevet US20060103777 - Optical film having a structured surface with rectangular based prisms
Optical film having a structured surface with rectangular based prisms
