COMPOSITE ELECTROPHORETICALLY-SWITCHABLE RETRO-REFLECTIVE IMAGE DISPLAY

摘要

A light deflector/recombiner (26) is longitudinally symmetrical with an X axis perpendicular to a Z axis. An X and Z vector components inverter (30) longitudinally symmetrical with both the X axis and a Y axis perpendicular to the X and Z axes lies parallel to the deflector/recombiner. A Y vector component inverter (28) longitudinally symmetrical with the X axis lies parallel to and between the deflector/recombiner and the X and Z inverter. The Y inverter has many reflector elements (54 or 56). Light rays incident in the Z direction encounter an element only once during return passage between the deflector/recombiner and the X and Z inverter. The X and Z inverter directionally inverts the rays with respect to the X and Z axes and the reflector element directionally inverts them with respect to the Y axis, retro-reflecting substantially all incident rays with respect to the X, Y and Z axes.