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|1. (WO2018042849) PROJECTION DISPLAY DEVICE|
|Title:||PROJECTION DISPLAY DEVICE|
According to one embodiment of the present invention, a projection display device is provided with: a light source optical system, which has a light source unit, a light conversion unit that converts outputted light from the light source unit into light of a wavelength region different from that of the outputted light, and a cooling unit that cools the light conversion unit; and an external housing, which houses the light source optical system, and has a suction port and an exhaust port, with which a linear air flow passage is formed. The light source unit and the light conversion unit are disposed on the air flow passage, and the cooling unit is disposed at a position shifted from the air flow passage.