Projection display apparatus

摘要

To provide a projection display apparatus having improving cooling efficiency, the apparatus comprising a modulation means (925) for respectively modulating a plurality of color light beams; a prism (910) for combining the modulated color light beams by the modulation means; a projection lens (6) for expansively projecting the combined light beams by the prism; a polarized light conversion device (920) for unifying the polarizing direction of an incident light on the modulation means; an inner case (901, 902) for encasing the polarized light conversion device; an outer case (2) for encasing the modulation means, the prism and the inner case; a cooling air intake port (150A) for introducing a cooling air into the outer case, located on the outer case; and a fan (15) for drawing the cooling air into the interior of the outer case; characterized in that a first ventilating path (A1) is formed to introduce a part of the cooling air drawn into the outer case along the side face of the prism; and a second ventilating path (A7) is formed to introduce another part of the cooling air drawn in to the outer case along at least one face of a light incident face and a light emerging face of the polarized light conversion device through an intake port (909) provided in a region according to the polarized light conversion device on the inner case.