Abstract: A ceiling-mounted projection system has a projector mounted above the ceiling, and a periscope assembly that can be moved by a motor along a vertical axis between a raised position in which the periscope assembly is retracted into the ceiling and a lowered position in which the lower portion of the periscope assembly extends below the ceiling. An upper mirror is mounted on the upper portion of the periscope assembly and aligned to reflect images from the projector in a downward direction when the periscope assembly is in the lowered position. A lower mirror is mounted on the lower portion of the periscope assembly and aligned to reflect the images from the upper mirror onto a viewing surface when the periscope assembly is in the lowered position.

Abstract: A method for forming a spatial light modulator (SLM) comprises forming a substrate (10) underneath a layer of Ferro-Electric crystal material (14) with a plurality of mirrored elements (12) disposed on the surface thereof. The process involves forming a layer of low stress oxide on the surface of the substrate over control pads or conductive strips (24) which are connected to underlying control elements. Openings (30) are formed in the oxide, followed by a formation of a conformal layer of aluminum (32). This is etched to form plugs (36) and then the substrate is subjected to a chemical/mechanical planarization step. This involves polishing the substrate to provide an optically flat surface. Thereafter, a layer of aluminum is then disposed on the surface of the substrate, patterned and etched to form the mirrored elements (12).