An optical sheet (140) includes a base layer (142a) and a light condensing pattern (142b) formed on the base layer integrally with the base layer and including one or more peaks and one or more valleys. Each of the base layer and the light condensing pattern includes a continuous phase and a dispersed...http://www.google.com/patents/US8167472?utm_source=gb-gplus-sharePatent US8167472 - Optical sheet and method of manufacturing the same
