A description of Toppan's Rear Projection Screen(RPJ-Screen) used on image projection systems is presented. This screen is a transmission type screen, used for rear projection type TV, data screen panel, etc. The screen size we can mass produce is from 40 to greater than 60 inches. The fundamental structure of RPJ-Screen and the design optimization for a single lens type projection system are described. A consequnce of this concept is a rear projection screen with enhanced S/N, higher gain, among other properties.