a front projection display system that integrates an optical engine , having control and power supply electronics , and a dedicated projection screen to provide a compact video display device . the projection engine is coupled to a high gain projection screen , having an optimized reflection pattern to give optimum optical performance in ambient h & amp ; and viewing angle sensitive environments . components of the projection engine are modularly placed in a retractable arm pivotally connected to the screen . the arm offers precise registration to the screen apparatus and thus repeatably precisely aligns optically and mechanically to the screen . the projection wall system has an open projection position and a closed storage position . use of a radically offset projection head having matching keystone correction features allows the arm to protrude above the head of the presenter and offer a sharp and unobtrusive projection zone .