1. US Patent 5,608,550, “Front-lit LCD having a brightness enhancing film with microridges which direct light through the display to a reflector”, 3M Company.
2. T. Funamoto, O. Yokoyama, S. Miyashita, and T. Shimoda, Asia Display 98 Digest, pp. 897–900
3. A. Tanaka, International Display Workshop IDW1998, pp. 347–350