A light illuminated display board and a lampshade using a light refraction and reflection effect in laminated transparent acrylic plastic plates is disclosed. The plastic plates are precisely cut at their four edge surfaces to form specifically angled and segmented edge surfaces individually having two...http://www.google.com/patents/US6308444?utm_source=gb-gplus-sharePatent US6308444 - Light illuminated display board and lampshade using light refraction and reflection effect of transparent acrylic plastic plates
