An illumination apparatus (100) is provided, the illumination apparatus including at least two light-emitting diodes (LEDs 1,2) capable of being driven in a flashing manner to output illumination light beams; a polarization converter unit (3,4) configured to match the polarization directions of the illumination light beams emitted from the at least two light source units (1,2); a liquid crystal cell (6) configured to receive the illumination light beams outputted from the polarization converter unit (3,4); and a control unit (74;20,21,25) configured to control, in synchronization, the liquid crystal cell (6) and the light source units (1,2) so as to intermittently drive the light source units and substantially continuously output illumination light beams from the liquid crystal cell (6).
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