A reflective illumination device is disclosed, which is comprised of a light-guiding screen with light reflecting ability and at least a directional light source; wherein the light-guiding screen includes a reflecting surface having a semi-Fresnel lens structure arranged thereon. The semi-Fresnel lens...http://www.google.com/patents/US7530712?utm_source=gb-gplus-sharePatent US7530712 - Reflective illumination device
